CN116181541B

CN116181541B - Engine control method, engine control device, processor and vehicle system

Info

Publication number: CN116181541B
Application number: CN202310225779.6A
Authority: CN
Inventors: 卫阳飞; 徐帅卿; 翟长辉; 马天伟; 刘志鹏
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2024-08-16
Anticipated expiration: 2043-03-03
Also published as: CN116181541A

Abstract

The application provides a control method, a control device, a processor and a vehicle system of an engine. The method comprises the following steps: acquiring a plurality of retardation ratios, wherein the retardation ratios are the ratio of retardation amount of an ignition angle corresponding to engine ignition to the maximum retardation amount; determining a target knock level according to at least the ignition quantity, a plurality of retardation ratios and a ratio occupation ratio, wherein the ignition quantity is the accumulated number of times of engine ignition, the ratio occupation ratio is the number occupation ratio exceeding the retardation ratio of the preset ratio in the retardation ratios of the ignition quantity, the target knock level is the knock level of the current stage of the engine, and the knock level is used for representing the severity of engine knocking; according to the target knock level, at least the maximum output torque of the engine is reduced, the severity of engine knock is reduced, and the higher the severity of the target knock level is characterized, the smaller the maximum output torque is correspondingly reduced. The application solves the problem of poor effect of the traditional knocking control mode.

Description

Engine control method, engine control device, processor and vehicle system

Technical Field

The present application relates to the field of engine control technology, and in particular, to an engine control method, an engine control device, a computer readable storage medium, a processor, and a vehicle system.

Background

Currently, in the case of a spark ignition engine, knocking is extremely easily caused by variations in fuel composition such as octane number, operating conditions such as intake air temperature, etc., resulting in serious malfunctions such as piston melting down, cylinder pulling, etc. How to effectively control knocking and maintain the dynamic property and economy as unchanged as possible is always an industry problem. The conventional method of controlling knocking is to retard the ignition angle immediately after knocking energy exceeds a limit value detected by a knock sensor, and to twist the engine by 50% after the ignition angle retard ratio exceeds the limit value for a while. The control effect of the control mode is poor.

Disclosure of Invention

The main object of the present application is to provide a control method, a control device, a computer readable storage medium, a processor and a vehicle system for an engine, which at least solve the problem of poor control effect of the conventional knock control method in the prior art.

In order to achieve the object, according to an aspect of the present application, there is provided a control method of an engine, comprising: acquiring a plurality of retardation ratios, wherein the retardation ratios are ratios of retardation amounts of ignition angles corresponding to the ignition of the engine to maximum retardation amounts, and the maximum retardation amounts are preset maximum values of the retardation amounts; determining a target knock level according to at least the number of ignition, a plurality of retard ratios and a proportion ratio, wherein the number of ignition is the accumulated number of times the engine ignites, the proportion ratio is the ratio of the number of retard ratios exceeding a preset proportion among the number of ignition ratios to the number of ignition ratios, the target knock level is the knock level of the current stage of the engine, and the knock level is used for representing the severity of engine knock; and according to the target knock level, reducing at least the maximum output torque of the engine, so that the reduced maximum output torque is smaller than the initial maximum torque of the engine to reduce the severity of the engine knock, wherein the higher the severity of the target knock level is, the smaller the maximum output torque is correspondingly, and the initial maximum torque is the maximum torque which can be output under the condition that the engine does not knock.

Optionally, the knock level includes medium knock, heavy knock, and super knock, and determining the target knock level based on at least the number of ignitions, the plurality of retard ratios, and the ratio-to-ratio includes: determining that the target knock level is the medium knock when the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio; determining that the target knock level is the severe knock when the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio; and determining that the target knock level is the super knock when the ignition quantity reaches a third value, the retard ratio is greater than a third ratio, the ratio is greater than a third ratio, and the excess ratio is greater than a fourth ratio, wherein the preset ratio comprises the first ratio, the second ratio and the third ratio, the first value, the second value and the third value are sequentially reduced, the second ratio is smaller than or equal to the third ratio and greater than the first ratio, the excess ratio is a ratio of the number of knock signals exceeding a first knock limit value to the ignition quantity in the ignition quantity knock signal value of the engine, and the fourth ratio is smaller than or equal to the first ratio.

Optionally, at least reducing the maximum output torque of the engine according to the target knock level includes: reducing the maximum output torque to a first predetermined multiple of the initial maximum torque, the first predetermined multiple being less than 1, in the case where the target knock level is the super knock; in the case where the target knock level is the medium knock or the severe knock, gradually decreasing the maximum output torque from the initial maximum torque until the decreased torque satisfies a predetermined condition, the decreased torque satisfying the predetermined condition being determined to be the decreased maximum output torque, the predetermined condition including one of: the reduced torque is equal to a second predetermined multiple of the initial maximum torque, the state of the engine running at an actual torque is in light knocking, the reduced torque is smaller than or equal to the second predetermined multiple of the initial maximum torque, the actual torque is smaller than or equal to the reduced torque, the second predetermined multiple is smaller than 1, the second predetermined multiple corresponding to the medium knocking and the heavy knocking are sequentially reduced, and both are larger than or equal to the first predetermined multiple.

Optionally, starting from the initial maximum torque, gradually reducing the maximum output torque until the reduced torque meets a predetermined condition, including: a step of reducing, namely sequentially reducing the initial maximum torque by a preset step length from the initial maximum torque to obtain the reduced torque; a control step of controlling the engine to operate at the actual torque that is less than or equal to the reduced torque; a determining step of determining whether the reduced torque satisfies the predetermined condition; and a circulation step of sequentially circulating the reducing step, the controlling step, and the determining step at least once until the reduced torque satisfies the predetermined condition, in a case where the reduced torque does not satisfy the predetermined condition.

Optionally, obtaining a plurality of deferral proportions includes: retarding the ignition angle in the event that the engine is ignited and the knock signal value is detected to be greater than a second knock limit, the second knock limit being less than the first knock limit; determining the angle between the initial position and the retarded position of the ignition angle as the retarded amount; determining a ratio of the amount of deferral to the maximum amount of deferral as the deferral proportion.

Optionally, determining the target knock level based at least on the number of ignitions, a plurality of said retard proportions, and the proportion duty cycle includes: determining that the target knock level is the medium knock in a case where the state of the engine is in a light knock, the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio in a stage preceding the current stage, the light knock being a state where the engine is not in the medium knock, the heavy knock, and the super knock; determining that the target knock level is the severe knock when the knock level corresponding to the previous stage is the slight knock or the medium knock, the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio; determining that the target knock level is the super knock when the number of ignitions reaches a third value, the retard ratio is greater than a third ratio, and the ratio is greater than a third ratio, the preset ratio including the first ratio, the second ratio, and the third ratio, the first value, the second value, and the third value decreasing in order, the second ratio being smaller than or equal to the third ratio and greater than the first ratio; in the case where the target knock level is not the medium knock, the heavy knock, and the super knock, it is determined that the state of the engine is the light knock.

Optionally, at least reducing the maximum output torque of the engine according to the target knock level includes: and according to the target knock level, reducing the maximum output torque of the engine, and increasing the EGR rate of the engine when the exhaust gas is recirculated by the cylinder, wherein the higher the severity of the target knock level is, the larger the EGR rate is correspondingly increased.

According to another aspect of the present application, there is provided a control device of an engine, including: an acquisition unit configured to acquire a plurality of retard ratios, the retard ratios being a ratio of a retard amount of an ignition angle corresponding to ignition of the engine to a maximum retard amount, the maximum retard amount being a preset maximum value of the retard amount; a first determining unit configured to determine a target knock level according to at least an ignition number, a plurality of retard ratios, and a proportion ratio, the ignition number being a cumulative number of times the engine is ignited, the proportion ratio being a ratio of a number of the retard ratios exceeding a preset proportion among the ignition number of the retard ratios to the ignition number, the target knock level being a knock level at a current stage of the engine, the knock level being used to characterize a severity of knocking of the engine; and a second determining unit configured to reduce at least a maximum output torque of the engine according to the target knock level such that the reduced maximum output torque is smaller than an initial maximum torque of the engine, which is a maximum torque that can be output without knocking of the engine, so as to reduce the severity of knocking of the engine, the higher the severity of the target knock level is, the smaller the maximum output torque is correspondingly reduced.

According to still another aspect of the present application, there is provided a computer readable storage medium including a stored program, wherein the program when run controls a device in which the computer readable storage medium is located to perform any one of the methods.

According to yet another aspect of the present application, there is provided a vehicle system including: a vehicle; the controller of the vehicle comprises one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods.

By applying the technical scheme of the application, a plurality of retardation ratios representing the ratio of retardation amount of an ignition angle corresponding to the ignition of an engine to the maximum retardation amount are firstly obtained; then determining a target knock level at the current stage of the engine at least according to the number of ignition, a plurality of retard ratios and a ratio duty ratio representing the retard ratio duty ratio exceeding a preset ratio; finally, according to the target knock level, reducing the maximum output torque of the engine at least to reduce the severity of engine knock, wherein the higher the knock severity represented by the target knock level is, the smaller the maximum output torque is correspondingly reduced. Compared with the prior art, the method has the advantages that the knocking control mode is single, knocking scenes with different severity degrees cannot be adapted, so that the problem of poor knocking control effect is solved, the target knocking grade representing the severity degree of knocking is determined according to the ignition quantity, the delay proportion and the proportion ratio, the maximum output torque of the engine is correspondingly adjusted according to the target knocking grade, the engine is limited, the corresponding torque limiting scheme is implemented according to the different severity degrees of engine knocking, the knocking with different degrees can be controlled in an adapting mode, and the good knocking control effect is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

Fig. 1 is a block diagram showing a hardware configuration of a mobile terminal performing a control method of an engine according to an embodiment of the present application;

FIG. 2 illustrates a flow diagram of a method of controlling an engine according to an embodiment of the present disclosure;

FIG. 3 illustrates a flow diagram of another engine control method provided in accordance with an embodiment of the present disclosure;

FIG. 4 illustrates a flow diagram of yet another engine control method provided in accordance with an embodiment of the present disclosure;

FIG. 5 illustrates a flow diagram of yet another engine control method provided in accordance with an embodiment of the present disclosure;

fig. 6 shows a block diagram of a control apparatus of an engine according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

102. A processor; 104. a memory; 106. a transmission device; 108. and an input/output device.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present application:

Knock signal value: the knocking sensor is arranged on the machine body, when knocking occurs, a vibration signal caused by combustion is transmitted to the machine body, and the machine body vibrates accordingly, so that the voltage detected by the knocking sensor is increased, and the signal value is the knocking signal value.

As described in the background art, the conventional knock control method in the prior art has poor control effect, and in order to solve the above problems, embodiments of the present application provide a control method, a control device, a computer-readable storage medium, a processor, and a vehicle system for an engine.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking a mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of the mobile terminal according to a control method of an engine according to an embodiment of the present application. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting on the structure of the mobile terminal. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store computer programs, such as software programs of application software and modules, such as computer programs corresponding to the method for displaying device information in the embodiment of the present invention, and the processor 102 executes the computer programs stored in the memory 104 to perform various functional applications and data processing, i.e., implement the method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as a NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.

In the present embodiment, a control method of an engine operating on a mobile terminal, a computer terminal, or a similar computing device is provided, it is to be noted that the steps shown in the flowcharts of the drawings may be executed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be executed in an order different from that shown or described herein.

Fig. 2 is a flowchart of a control method of an engine according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

Step S201, obtaining a plurality of retardation ratios, wherein the retardation ratios are ratios of retardation amounts of ignition angles corresponding to the ignition of the engine to maximum retardation amounts, and the maximum retardation amounts are preset maximum values of the retardation amounts;

Specifically, the direct protection measure after the engine knocks is to retard the ignition angle, which is also called the ignition advance angle, and refers to the angle through which the crankshaft rotates from the ignition time to the time when the piston reaches compression top dead center; the ignition angle retardation amount is used for reducing the ignition angle under the condition that the engine knocks so as to retard the ignition, thereby achieving the purpose of inhibiting the engine knocking; the ignition angle retardation has the maximum limit, that is, the maximum retardation amount; exceeding this maximum amount of retardation can lead to other reliability problems for the engine. Each time the engine is ignited, the retard amount corresponds to one time, and the retard proportion corresponds to one time. The retard amount of the ignition angle corresponding to each engine ignition refers to the difference between the initial ignition angle of the engine and the ignition angle corresponding to the current engine ignition.

Step S202, determining a target knock level at least according to the ignition quantity, a plurality of retardation ratios and a proportion ratio, wherein the ignition quantity is the accumulated number of times of ignition of the engine, the proportion ratio is the ratio of the quantity exceeding a preset proportion among the retardation ratios of the ignition quantity to the ignition quantity, the target knock level is the knock level of the current stage of the engine, and the knock level is used for representing the severity of knocking of the engine;

Specifically, the preset proportion is a preset proportion, such as 50%,60% and other numerical values; the application can set how many times each ignition is, and determine the target knock level once, for example, the current target knock level of the engine is determined once every 20 times each ignition, namely, the ignition quantity is 20, and then the target knock level of the engine is determined once every 50 times each ignition, namely, the ignition quantity is 50. The knock level may include a medium knock, a heavy knock, and a super knock, which are sequentially increased in severity, but of course, the knock level is not limited to the medium knock, the heavy knock, and the super knock, and the number of knock levels may be flexibly set according to actual situations in the art. For the ratio, for example, in the case where the number of ignition is 100, there are 100 corresponding to the retard ratio, wherein the number of the retard ratio exceeding the preset ratio is 60, the ratio is 60/100=60%; for example, when the ignition quantity is 200, there are 200 corresponding to the retard proportion, wherein the quantity of the retard proportion exceeding the preset proportion is 100, the proportion is 100/200=50%;

Step S203, according to the target knock level, reducing at least the maximum output torque of the engine, such that the reduced maximum output torque is smaller than an initial maximum torque of the engine, to reduce the severity of the engine knock, the higher the severity of the target knock level is, the smaller the maximum output torque is correspondingly, the initial maximum torque is the maximum torque that can be output in the case that the engine does not knock.

Specifically, the maximum output torque is the maximum torque that the engine can output once, is a preset torque limit value of the engine, and the actual torque output by the engine cannot exceed the maximum output torque in the case of knocking. Similarly, the initial maximum torque is also a preset torque limit value of the engine, and the output torque of the engine cannot exceed the initial maximum torque when the engine does not knock.

With the described embodiment, first a plurality of retard ratios characterizing a ratio of a retard amount of an ignition angle corresponding to ignition of an engine to a maximum retard amount are obtained; then determining a target knock level at the current stage of the engine at least according to the number of ignition, a plurality of retard ratios and a ratio duty ratio representing the retard ratio duty ratio exceeding a preset ratio; finally, according to the target knock level, reducing the maximum output torque of the engine at least to reduce the severity of engine knock, wherein the higher the knock severity represented by the target knock level is, the smaller the maximum output torque is correspondingly reduced. Compared with the prior art, the method has the advantages that the knocking control mode is single, knocking scenes with different severity degrees cannot be adapted, so that the problem of poor knocking control effect is solved, the target knocking grade representing the severity degree of knocking is determined according to the ignition quantity, the delay proportion and the proportion ratio, the maximum output torque of the engine is correspondingly adjusted according to the target knocking grade, the engine is limited, the corresponding torque limiting scheme is implemented according to the different severity degrees of engine knocking, the knocking with different degrees can be controlled in an adapting mode, and the good knocking control effect is ensured.

In order to further solve the problem of poor control effect of the conventional knock control method in the prior art, in an alternative solution, the knock level includes medium knock, severe knock, and super knock, as shown in fig. 3, the step S202 specifically includes the following steps:

step S2021: determining that the target knock level is the medium knock when the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio;

specifically, when the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio, it is indicated that the retard ratio of the knocking ignition angle exceeds a medium limit value for a long time, and it is determined that the engine is at the medium knocking;

Step S2022: determining that the target knock level is the severe knock when the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio;

specifically, when the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio, the retard ratio indicating the knocking ignition angle is largely exceeded by a high limit value for a short time, and the engine is determined to be in the serious knocking;

Step S2023: and determining that the target knock level is the super knock when the ignition quantity reaches a third value, the retard ratio is greater than a third ratio, the ratio is greater than a third ratio, and the excess ratio is greater than a fourth ratio, wherein the preset ratio comprises the first ratio, the second ratio and the third ratio, the first value, the second value and the third value are sequentially reduced, the second ratio is smaller than or equal to the third ratio and greater than the first ratio, the excess ratio is a ratio of the number of knock signals exceeding a first knock limit value to the ignition quantity in the ignition quantity knock signal value of the engine, and the fourth ratio is smaller than or equal to the first ratio.

Specifically, when the number of ignition reaches a third value, the retard ratio is greater than the third ratio, the ratio is greater than the third ratio, and the excess ratio is greater than the fourth ratio, it is indicated that the retard ratio of the knock ignition angle is greater than the upper limit value for a short time and the excess ratio of the knock signal value is greater than the middle limit value for a short time, at which point it is determined that the engine is in the super-knock. The knocking severity levels corresponding to the medium knocking, the serious knocking and the super knocking are sequentially increased, the first knocking limit value is called a serious vibration signal limit value, the first knocking limit value is a preset knocking limit value, when the knocking signal value of the engine exceeds the first knocking limit value, the engine is considered to have serious vibration, and a certain amount of ignition angle retardation is correspondingly carried out.

In the embodiment, according to the ignition quantity, the plurality of delay ratios, the proportion ratio and the excess ratio, the knock level of the engine is divided into the middle knock level, the serious knock level and the super knock level, so that different engine protection strategies can be conveniently adopted according to different knock levels, and the problem of poor protection effect caused by adopting the same engine protection strategies when the middle knock and the super knock occur in the engine is avoided.

The first value, the second value, the third value, the first proportion, the second proportion, the third proportion, the first duty ratio, the second duty ratio, the third duty ratio and the fourth duty ratio are all preset values, and a person skilled in the art can flexibly set specific values of the parameters according to actual conditions. In a specific embodiment, the first value is 500, the second value is 50, the third value is 20, the first ratio is 0.9, the second ratio is 0.95, the third ratio is 0.95, the first ratio is 50%, the second ratio is 60%, the third ratio is 60%, and the fourth ratio is 50%.

The implementation of determining the target knock level based on at least the number of ignitions, the plurality of retard ratios, and the ratio-to-ratio is not limited to the manner described, and in other embodiments, the knock level includes medium knock, heavy knock, and super knock, and the determining the target knock level based on at least the number of ignitions, the plurality of retard ratios, and the ratio-to-ratio includes: determining that the target knock level is the medium knock when the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio; determining that the target knock level is the severe knock when the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio; and determining that the target knock level is the super knock when the ignition quantity reaches a third value, the retard ratio is greater than a third ratio, and the ratio is greater than a third ratio, wherein the preset ratio includes the first ratio, the second ratio, and the third ratio, the first value, the second value, and the third value decrease in order, the second ratio is less than or equal to the third ratio and greater than the first ratio, and the second ratio is less than or equal to the third ratio and greater than the first ratio. In the embodiment, according to the ignition quantity, the retardation proportion and the proportion ratio, the knock level of the engine is divided into a middle knock level, a serious knock level and a super knock level, so that different engine protection strategies can be conveniently adopted according to different knock levels, and the problem of poor protection effect caused by adopting the same engine protection strategies when the engine knocks moderately and super.

According to an exemplary embodiment of the present application, the specific implementation manner of the step S203 may include:

Step S2031: reducing the maximum output torque to a first predetermined multiple of the initial maximum torque, the first predetermined multiple being less than 1, in the case where the target knock level is the super knock;

Specifically, under the condition that the target knock level is the super knock, the engine knock is severe, the knock sensor can still detect a strong vibration signal after the ignition angle retardation reaches the maximum retardation, and the engine has a huge damage risk at the moment.

Step S2032: in the case where the target knock level is the medium knock or the severe knock, gradually decreasing the maximum output torque from the initial maximum torque until the decreased torque satisfies a predetermined condition, the decreased torque satisfying the predetermined condition being determined to be the decreased maximum output torque, the predetermined condition including one of: the reduced torque is equal to a second predetermined multiple of the initial maximum torque, the state of the engine running at an actual torque is in light knocking, the reduced torque is smaller than or equal to the second predetermined multiple of the initial maximum torque, the actual torque is smaller than or equal to the reduced torque, the second predetermined multiple is smaller than 1, the second predetermined multiple corresponding to the medium knocking and the heavy knocking are sequentially reduced, and both are larger than or equal to the first predetermined multiple.

Specifically, in the case where the target knock level is the medium knock or the severe knock, it is explained that the knock of the engine has not yet been severe to some extent, and no severe torque limitation is required at this time, so the present application gradually reduces the maximum output torque from the initial maximum torque to limit the torque of the engine. The light knock is a state where the engine is not in the medium knock, the heavy knock, and the super knock, indicating that the engine is not knocked or knocked to a lesser extent at this time. The predetermined condition includes that the reduced torque is equal to a second predetermined multiple of the initial maximum torque, that is, if the reduced maximum output torque reaches the second predetermined multiple of the initial maximum torque during the gradual reduction of the maximum output torque of the engine, the maximum output torque is not reduced continuously, and the second predetermined multiple of the initial maximum torque is taken as a torque limit value corresponding to the current knock level; the predetermined condition may further include that the state of the engine operating at the actual torque is at light knock and the reduced torque is less than or equal to the second predetermined multiple of the initial maximum torque, that is, if the degree of knock of the engine is reduced from heavy knock to light knock or from medium knock to light knock during a gradual reduction of the maximum output torque of the engine, and the reduced maximum output torque is less than or equal to the second predetermined multiple of the initial maximum torque, the maximum output torque is not reduced any more, and the engine operation is controlled at the current reduced torque.

In the embodiment, under the condition that the engine is in super knocking, the engine is prevented from being further damaged by severely limiting torsion, so that a good knocking control effect is further ensured, and the problem of reliability of the engine is further avoided; under the condition that the engine is in medium knocking or serious knocking, the serious torque limiting is not needed, and at the moment, the maximum output torque is gradually reduced until the reduced torque reaches the second preset multiple of the initial maximum torque, so that the knocking is further restrained, the engine damage is avoided, and meanwhile, the driving experience of a driver is guaranteed to be good.

The first predetermined multiple, the second predetermined multiple corresponding to the moderate knock, and the second predetermined multiple corresponding to the severe knock are all preset values, and a person skilled in the art may flexibly set actual values of these parameters according to actual needs, where in an alternative embodiment, the first predetermined multiple is 50%, the second predetermined multiple corresponding to the moderate knock is 75%, and the second predetermined multiple corresponding to the severe knock is 50%.

Of course, the specific implementation of the step S203 is not limited to the above-mentioned manner, and in yet another alternative embodiment, the step S203 may further include: reducing the maximum output torque to a first predetermined multiple of the initial maximum torque, the first predetermined multiple being less than 1, in the case where the target knock level is the super knock; and when the target knock level is the moderate knock or the severe knock, starting from the initial maximum torque, limiting the maximum output torque to a second preset multiple of the maximum torque according to a certain slope, wherein the second preset multiple is smaller than 1, and the second preset multiple corresponding to the moderate knock and the severe knock are sequentially reduced and are larger than or equal to the first preset multiple.

In order to further secure a better effect of controlling knocking while further avoiding a problem of poor driving experience of a driver, further, gradually decreasing the maximum output torque from the initial maximum torque until the decreased torque satisfies a predetermined condition, including: a step of reducing, namely sequentially reducing the initial maximum torque by a preset step length from the initial maximum torque to obtain the reduced torque; a control step of controlling the engine to operate at the actual torque that is less than or equal to the reduced torque; a determining step of determining whether the reduced torque satisfies the predetermined condition; and a circulation step of sequentially circulating the reducing step, the controlling step, and the determining step at least once until the reduced torque satisfies the predetermined condition, in a case where the reduced torque does not satisfy the predetermined condition. The reduction step, the control step and the determination step are circularly executed to realize the effect of dynamically adjusting the maximum output torque of the engine in an adaptive manner according to the knocking degree of the engine, so that the effects of controlling the knocking are better, the service life of the engine is longer, and the problem of poor driving experience caused by a single torque limiting mode is further avoided.

Optionally, obtaining a plurality of deferral proportions includes: retarding the ignition angle in the event that the engine is ignited and the knock signal value is detected to be greater than a second knock limit, the second knock limit being less than the first knock limit; determining the angle between the initial position and the retarded position of the ignition angle as the retarded amount; determining a ratio of the amount of deferral to the maximum amount of deferral as the deferral proportion. This makes it possible to obtain the retard proportion relatively simply and quickly at each engine ignition.

Specifically, the second knock limit value is also called a conventional vibration signal limit value, and is a preset knock limit value, when the knock signal value of the engine exceeds the second knock limit value, the engine is considered to have conventional vibration, and a certain amount of ignition delay is correspondingly performed, and the ignition delay amount corresponding to the second knock limit value is smaller than the ignition delay amount corresponding to the first knock limit value. The initial position is a position corresponding to the engine when the engine is not delayed.

In another alternative embodiment of the present application, determining the target knock level based at least on the number of ignitions, a plurality of said retard ratios, and the ratio-to-ratio includes the specific procedure shown in fig. 4:

Step S2024: determining that the target knock level is the medium knock in a case where the state of the engine is in a light knock, the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio in a stage preceding the current stage, the light knock being a state where the engine is not in the medium knock, the heavy knock, and the super knock;

Step S2025: determining that the target knock level is the severe knock when the knock level corresponding to the previous stage is the slight knock or the medium knock, the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio;

Step S2026: determining that the target knock level is the super knock when the number of ignitions reaches a third value, the retard ratio is greater than a third ratio, and the ratio is greater than a third ratio, the preset ratio including the first ratio, the second ratio, and the third ratio, the first value, the second value, and the third value decreasing in order, the second ratio being smaller than or equal to the third ratio and greater than the first ratio;

Step S2027: in the case where the target knock level is not the medium knock, the heavy knock, and the super knock, it is determined that the state of the engine is the light knock.

In the embodiment, the target knock level of the engine in the current stage is determined according to the knock degree of the engine in the previous stage in addition to the ignition quantity, the plurality of delay proportions and the proportion ratio, when the engine is in a slight vibration state and the requirements of the ignition quantity, the delay proportions and the proportion ratio are met, the engine is determined to be at medium knock, when the engine is at medium knock and the requirements of the ignition quantity, the delay proportions and the proportion ratio are met, the engine is determined to be at serious knock, and when the engine meets the requirements of the ignition quantity, the delay proportions and the proportion ratio, the engine is determined to be at super knock no matter what the knock degree of the engine in the previous stage.

In order to further ensure a better knock control effect on the engine, thereby further avoiding damage caused by engine knocking, specifically, at least reducing the maximum output torque of the engine according to the target knock level, including: and according to the target knock level, reducing the maximum output torque of the engine, and increasing the EGR rate of the engine when the exhaust gas is recirculated by the cylinder, wherein the higher the severity of the target knock level is, the larger the EGR rate is correspondingly increased. According to different target knock levels, the maximum output torque of the engine is correspondingly reduced to different degrees, and the EGR rate of the engine is correspondingly increased to different degrees, so that the control effect of controlling the knock mode can be further ensured to be matched with the current knock level, and the better knock suppression effect is further ensured.

In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method of the engine of the present application will be described in detail with reference to specific embodiments.

The embodiment relates to a specific engine control method, as shown in fig. 5, including the following steps:

step S1: the engine is at a light knock, which is a knock level that the engine can fully withstand, including no or light knock.

Step S2: when the engine is in medium knocking and the engine runs in slight knocking, if the condition A is met, entering a protection mode of the medium knocking, wherein the condition A is as follows: the ratio of the ignition angle retardation is more than 0.9, and the ratio of the retardation ratio exceeding the preset ratio is more than 50% in the quantity of 500 ignition;

step S3: when the engine is in serious knocking and the engine runs in moderate knocking, if the condition B is met, entering a protection mode of the serious knocking, wherein the condition B is as follows: the ratio of the ignition angle retardation is more than 0.95, and the ratio of the retardation ratio exceeding the preset ratio is more than 60% in the quantity of 50 ignition;

Step S4: when the engine is in super knocking and the engine is in any mode, if the condition C is met, entering a super knocking protection mode, wherein the condition C is as follows: the ratio of the ignition angle retardation is more than 0.95, the ratio of the retardation ratio exceeding the preset ratio is more than 60% in the number of 20 ignition, and the knocking signal value is higher than the ratio of the serious vibration signal limit value, namely more than 50%;

Step S5: the corresponding protection modes are: slight knocking: the method is free; moderate knock: limiting torsion to 75% of the initial maximum torque according to a certain slope; severe knocking: limiting torsion to 50% of the initial maximum torque according to a certain slope; super knocking: the torque is immediately limited to 50% of the initial maximum torque, preventing further damage to the engine.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

The embodiment of the application also provides a control device of the engine, and the control device of the engine can be used for executing the control method for the engine. The device is used for implementing the embodiments and the preferred embodiments, and is not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The following describes a control device of an engine provided by an embodiment of the present application.

Fig. 6 is a schematic diagram of a control device of an engine according to an embodiment of the present application. As shown in fig. 6, the apparatus includes:

an acquisition unit 10 configured to acquire a plurality of retard ratios, the retard ratios being a ratio of a retard amount of an ignition angle corresponding to ignition of the engine to a maximum retard amount, the maximum retard amount being a preset maximum value of the retard amount;

A first determining unit 10 configured to determine a target knock level according to at least an ignition number, a plurality of retard ratios, and a proportion ratio, the ignition number being a cumulative number of times the engine is ignited, the proportion ratio being a ratio of a number of the retard ratios exceeding a preset proportion among the ignition number of the retard ratios to the ignition number, the target knock level being a knock level at a current stage of the engine, the knock level being used to characterize a severity of knocking of the engine;

And a second determining unit 30 configured to reduce at least a maximum output torque of the engine according to the target knock level such that the reduced maximum output torque is smaller than an initial maximum torque of the engine, which is a maximum torque that can be output without knocking of the engine, so as to reduce the severity of knocking of the engine, the higher the severity being characterized by the target knock level, the smaller the corresponding reduced maximum output torque.

With the embodiment, a plurality of retard ratios characterizing a ratio of a retard amount of an ignition angle corresponding to ignition of the engine to a maximum retard amount are acquired by the acquisition unit; determining a target knock level at a current stage of the engine by a first determining unit at least according to the number of ignition, a plurality of retard ratios, and a ratio duty ratio characterizing the retard ratio duty ratio exceeding a preset ratio; and reducing the severity of engine knocking by reducing at least the maximum output torque of the engine according to the target knock level through a second determining unit, wherein the higher the knock severity represented by the target knock level is, the smaller the maximum output torque is correspondingly reduced. Compared with the prior art, the method has the advantages that the knocking control mode is single, knocking scenes with different severity degrees cannot be adapted, so that the problem of poor knocking control effect is solved, the target knocking grade representing the severity degree of knocking is determined according to the ignition quantity, the delay proportion and the proportion ratio, the maximum output torque of the engine is correspondingly adjusted according to the target knocking grade, the engine is limited, the corresponding torque limiting scheme is implemented according to the different severity degrees of engine knocking, the knocking with different degrees can be controlled in an adapting mode, and the good knocking control effect is ensured.

In order to further solve the problem of poor control effect of the conventional knock control method in the prior art, in an alternative solution, the knock level includes moderate knock, severe knock, and super knock, and the first determining unit specifically includes:

A first determination module configured to determine that the target knock level is the medium knock when the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio;

a second determining module configured to determine that the target knock level is the severe knock when the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio;

and a third determining module configured to determine that the target knock level is the super knock when the number of ignitions reaches a third value, the retard ratio is greater than a third ratio, the ratio duty ratio is greater than a third duty ratio, and an excess ratio is greater than a fourth duty ratio, where the preset ratio includes a ratio of the number of knock signals exceeding a first knock limit to the number of ignitions, the first value, the second value, and the third value decrease in order, the second ratio is less than or equal to the third ratio and greater than the first ratio, and the excess ratio is a ratio of the number of knock signals exceeding a first knock limit to the number of ignitions in the number of knock signals of the engine, and the fourth duty ratio is less than or equal to the first duty ratio.

The implementation of determining the target knock level based on at least the number of ignition, a plurality of the retard ratios, and the ratio-to-ratio is not limited to the manner described, and in other embodiments, the knock level includes medium knock, heavy knock, and super knock, and the first determining unit includes: a fourth determining module configured to determine that the target knock level is the medium knock when the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio; a fifth determining module configured to determine that the target knock level is the severe knock if the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio; a sixth determining module configured to determine that the target knock level is the super knock when the number of ignitions reaches a third value, the retard ratio is greater than a third ratio, and the ratio is greater than a third ratio, where the preset ratio includes the first ratio, the second ratio, and the third ratio, and the first value, the second value, and the third value decrease in order, and the second ratio is smaller than or equal to the third ratio and greater than the first ratio. In the embodiment, according to the ignition quantity, the retardation proportion and the proportion ratio, the knock level of the engine is divided into a middle knock level, a serious knock level and a super knock level, so that different engine protection strategies can be conveniently adopted according to different knock levels, and the problem of poor protection effect caused by adopting the same engine protection strategies when the engine knocks moderately and super.

According to an exemplary embodiment of the present application, the second determining unit may specifically include:

A first reduction module for reducing the maximum output torque to a first predetermined multiple of the initial maximum torque, the first predetermined multiple being less than 1, in the case where the target knock level is the super knock;

A second reduction module configured to gradually reduce the maximum output torque from the initial maximum torque until a reduced torque satisfies a predetermined condition, in a case where the target knock level is the medium knock or the heavy knock, the reduced torque satisfying the predetermined condition being the reduced maximum output torque, the predetermined condition including one of: the reduced torque is equal to a second predetermined multiple of the initial maximum torque, the state of the engine running at an actual torque is in light knocking, the reduced torque is smaller than or equal to the second predetermined multiple of the initial maximum torque, the actual torque is smaller than or equal to the reduced torque, the second predetermined multiple is smaller than 1, the second predetermined multiple corresponding to the medium knocking and the heavy knocking are sequentially reduced, and both are larger than or equal to the first predetermined multiple.

Of course, the second determining unit is not limited to include the module, and in yet another alternative embodiment, the second determining unit may further include: a third reduction module for reducing the maximum output torque to a first predetermined multiple of the initial maximum torque, the first predetermined multiple being less than 1, in the case where the target knock level is the super knock; and the torque limiting module is used for limiting the maximum output torque to a second preset multiple of the maximum torque according to a certain slope from the initial maximum torque under the condition that the target knock level is the medium knock or the serious knock, wherein the second preset multiple is smaller than 1, and the second preset multiple corresponding to the medium knock and the serious knock are sequentially reduced and are both larger than or equal to the first preset multiple.

In order to further ensure that the effect of controlling knocking is better, and at the same time further avoid the problem of poor driving experience of the driver, further, the second reducing module includes: a reducing sub-module, configured to reduce the initial maximum torque by a predetermined step from the initial maximum torque, so as to obtain the reduced torque; a control sub-module for controlling the engine to operate at the actual torque less than or equal to the reduced torque; a determining sub-module for determining whether the reduced torque meets the predetermined condition; and a circulation sub-module configured to circulate the reducing step, the controlling step, and the determining step sequentially at least once until the reduced torque satisfies the predetermined condition, in a case where the reduced torque does not satisfy the predetermined condition. The reduction step, the control step and the determination step are circularly executed to realize the effect of dynamically adjusting the maximum output torque of the engine in an adaptive manner according to the knocking degree of the engine, so that the effects of controlling the knocking are better, the service life of the engine is longer, and the problem of poor driving experience caused by a single torque limiting mode is further avoided.

Optionally, the acquiring unit includes: a retard module for retarding the ignition angle if the engine is ignited and the knock signal value is detected to be greater than a second knock limit, the second knock limit being less than the first knock limit; a seventh determining module configured to determine an angle between the ignition angle from an initial position to a retarded position as the retarded amount; an eighth determination module is configured to determine that a ratio of the deferral amount to the maximum deferral amount is the deferral proportion. This makes it possible to obtain the retard proportion relatively simply and quickly at each engine ignition.

In another alternative embodiment of the present application, the first determining unit includes:

a ninth determination module configured to determine that the target knock level is the medium knock, and the slight knock is a state in which the engine is not in the medium knock, the severe knock, and the super knock, in a case where the state of the engine in a stage previous to the current stage is in the slight knock, the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio;

A tenth determination module configured to determine that the target knock level is the severe knock when the knock level corresponding to the previous stage is the slight knock or the moderate knock, the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio;

An eleventh determination module configured to determine that the target knock level is the super knock when the number of ignitions reaches a third value, the retard ratio is greater than a third ratio, and the ratio is greater than a third ratio, the preset ratio including the first ratio, the second ratio, and the third ratio, the first value, the second value, and the third value decreasing in order, the second ratio being smaller than or equal to the third ratio and greater than the first ratio;

a twelfth determination module determines that the state of the engine is at the light knock if the target knock level is not the medium knock, the heavy knock, or the super knock.

In order to further ensure a good knock control effect on the engine, thereby further avoiding damage caused by engine knock, in particular, the second determination unit comprises: and a fourth reduction module, configured to reduce a maximum output torque of the engine according to the target knock level, and increase an EGR rate when exhaust gas recirculation is performed by a cylinder of the engine, where the higher the severity of the target knock level is, the greater the EGR rate after the increase is correspondingly. According to different target knock levels, the maximum output torque of the engine is correspondingly reduced to different degrees, and the EGR rate of the engine is correspondingly increased to different degrees, so that the control effect of controlling the knock mode can be further ensured to be matched with the current knock level, and the better knock suppression effect is further ensured.

The control device of the engine comprises a processor and a memory, wherein the acquisition unit, the first determination unit, the second determination unit and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; or the modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problem of poor control effect of the traditional knocking control mode in the prior art is at least solved by adjusting the parameters of the inner core.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein when the program runs, equipment where the computer readable storage medium is located is controlled to execute a control method of an engine.

Specifically, the control method of the engine includes:

The embodiment of the invention provides a processor which is used for running a program, wherein the control method of an engine is executed when the program runs.

Specifically, the control method of the engine includes:

The embodiment of the invention provides an electronic device, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:

The device herein may be a server, PC, PAD, cell phone, etc.

The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:

An embodiment of the present invention provides a vehicle system including: a vehicle; the controller of the vehicle comprises one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods.

It will be appreciated by those skilled in the art that the modules or steps of the invention described may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code that is executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A control method of an engine, characterized by comprising:

acquiring a plurality of retardation ratios, wherein the retardation ratios are ratios of retardation amounts of ignition angles corresponding to the ignition of the engine to maximum retardation amounts, and the maximum retardation amounts are preset maximum values of the retardation amounts;

Determining a target knock level according to at least the number of ignition, a plurality of retard ratios and a proportion ratio, wherein the number of ignition is the accumulated number of times the engine ignites, the proportion ratio is the ratio of the number of retard ratios exceeding a preset proportion among the number of ignition ratios to the number of ignition ratios, the target knock level is the knock level of the current stage of the engine, and the knock level is used for representing the severity of engine knock;

And according to the target knock level, reducing at least the maximum output torque of the engine, so that the reduced maximum output torque is smaller than the initial maximum torque of the engine to reduce the severity of the engine knock, wherein the higher the severity of the target knock level is, the smaller the maximum output torque is correspondingly, and the initial maximum torque is the maximum torque which can be output under the condition that the engine does not knock.

2. The method of claim 1, wherein the knock level comprises a medium knock, a heavy knock, and a super knock, determining a target knock level based at least on an ignition count, a plurality of the retard ratios, and a ratio-to-ratio, comprising:

Determining that the target knock level is the medium knock when the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio;

determining that the target knock level is the severe knock when the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio;

And determining that the target knock level is the super knock when the ignition quantity reaches a third value, the retard ratio is greater than a third ratio, the ratio is greater than a third ratio, and the excess ratio is greater than a fourth ratio, wherein the preset ratio comprises the first ratio, the second ratio and the third ratio, the first value, the second value and the third value are sequentially reduced, the second ratio is smaller than or equal to the third ratio and greater than the first ratio, the excess ratio is a ratio of the number of knock signals exceeding a first knock limit value to the ignition quantity in the ignition quantity knock signal value of the engine, and the fourth ratio is smaller than or equal to the first ratio.

3. The method of claim 2, wherein reducing at least a maximum output torque of the engine according to the target knock level comprises:

Reducing the maximum output torque to a first predetermined multiple of the initial maximum torque, the first predetermined multiple being less than 1, in the case where the target knock level is the super knock;

In the case where the target knock level is the medium knock or the severe knock, gradually decreasing the maximum output torque from the initial maximum torque until the decreased torque satisfies a predetermined condition, the decreased torque satisfying the predetermined condition being determined to be the decreased maximum output torque, the predetermined condition including one of: the reduced torque is equal to a second predetermined multiple of the initial maximum torque, the state of the engine running at an actual torque is in light knocking, the reduced torque is smaller than or equal to the second predetermined multiple of the initial maximum torque, the actual torque is smaller than or equal to the reduced torque, the second predetermined multiple is smaller than 1, the second predetermined multiple corresponding to the medium knocking and the heavy knocking are sequentially reduced, and both are larger than or equal to the first predetermined multiple.

4. A method according to claim 3, wherein gradually decreasing the maximum output torque from the initial maximum torque until the decreased torque meets a predetermined condition, comprises:

A step of reducing, namely sequentially reducing the initial maximum torque by a preset step length from the initial maximum torque to obtain the reduced torque;

a control step of controlling the engine to operate at the actual torque that is less than or equal to the reduced torque;

a determining step of determining whether the reduced torque satisfies the predetermined condition;

And a circulation step of sequentially circulating the reducing step, the controlling step, and the determining step at least once until the reduced torque satisfies the predetermined condition, in a case where the reduced torque does not satisfy the predetermined condition.

5. The method of any of claims 2 to 4, wherein obtaining a plurality of deferral proportions comprises:

Retarding the ignition angle in the event that the engine is ignited and the knock signal value is detected to be greater than a second knock limit, the second knock limit being less than the first knock limit;

Determining the angle between the initial position and the retarded position of the ignition angle as the retarded amount;

Determining a ratio of the amount of deferral to the maximum amount of deferral as the deferral proportion.

6. The method according to any one of claims 2 to 4, characterized in that determining a target knock level based at least on the number of ignitions, a plurality of said retard proportions, and a proportion ratio, comprises:

Determining that the target knock level is the medium knock in a case where the state of the engine is in a light knock, the number of ignition reaches a first value, the retard ratio is greater than a first ratio, and the ratio is greater than a first ratio in a stage preceding the current stage, the light knock being a state where the engine is not in the medium knock, the heavy knock, and the super knock;

Determining that the target knock level is the severe knock when the knock level corresponding to the previous stage is the slight knock or the medium knock, the number of ignition reaches a second value, the retard ratio is greater than a second ratio, and the ratio is greater than a second ratio;

Determining that the target knock level is the super knock when the number of ignitions reaches a third value, the retard ratio is greater than a third ratio, and the ratio is greater than a third ratio, the preset ratio including the first ratio, the second ratio, and the third ratio, the first value, the second value, and the third value decreasing in order, the second ratio being smaller than or equal to the third ratio and greater than the first ratio;

In the case where the target knock level is not the medium knock, the heavy knock, and the super knock, it is determined that the state of the engine is the light knock.

7. The method according to any one of claims 1 to 4, characterized in that at least reducing the maximum output torque of the engine according to the target knock level includes:

And according to the target knock level, reducing the maximum output torque of the engine, and increasing the EGR rate of the engine when the exhaust gas is recirculated by the cylinder, wherein the higher the severity of the target knock level is, the larger the EGR rate is correspondingly increased.

8. A control device of an engine, characterized by comprising:

an acquisition unit configured to acquire a plurality of retard ratios, the retard ratios being a ratio of a retard amount of an ignition angle corresponding to ignition of the engine to a maximum retard amount, the maximum retard amount being a preset maximum value of the retard amount;

A first determining unit configured to determine a target knock level according to at least an ignition number, a plurality of retard ratios, and a proportion ratio, the ignition number being a cumulative number of times the engine is ignited, the proportion ratio being a ratio of a number of the retard ratios exceeding a preset proportion among the ignition number of the retard ratios to the ignition number, the target knock level being a knock level at a current stage of the engine, the knock level being used to characterize a severity of knocking of the engine;

And a second determining unit configured to reduce at least a maximum output torque of the engine according to the target knock level such that the reduced maximum output torque is smaller than an initial maximum torque of the engine, which is a maximum torque that can be output without knocking of the engine, so as to reduce the severity of knocking of the engine, the higher the severity of the target knock level is, the smaller the maximum output torque is correspondingly reduced.

9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 7.

10. A vehicle system, comprising:

a vehicle;

The controller of the vehicle comprising one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing the method of any of claims 1-7.