CN111946471A - Control method and system for prohibition and recovery of engine idle speed fuel cut off - Google Patents

Abstract

The invention discloses a control method and system for prohibiting and recovering engine idling oil cut off. The method includes the following steps: acquiring idling speed condition information of the engine, where the idling speed condition information includes the engine gear-gear condition, clutch engagement condition, vehicle speed, Engine speed, speed change rate, transmission system request torque reduction condition and engine idle speed closed-loop control condition, compare the vehicle speed with the vehicle speed preset value; when it is detected that the engine is in gear, the clutch is fully engaged and the vehicle speed is greater than the vehicle speed preset value, then Send the engine idle speed fuel cut permission command; when it is detected that the transmission system requests torque reduction, the engine idle speed fuel cut off permission command is sent. The invention provides a control method and system for prohibiting and recovering engine idling oil cut-off, by acquiring the idling speed condition information of the engine, and sending the idling oil cut-off permission or prohibition command according to the idling speed condition information, thereby realizing the stability of the engine idling speed control and improving the quality of the vehicle. the comfort of the occupants.

Description

Control method and system for prohibition and recovery of engine idle speed fuel cut off

technical field

The invention relates to the technical field of engine idle speed and fuel injection control, in particular to a control method and system for prohibiting and recovering engine idle speed fuel cut off.

Background technique

Idle speed is the most common working condition when the engine is working, and because of its low engine speed, the comfort and drivability are the most obvious to the occupants in the car.

The engine oil cut condition is the most direct and effective way to reduce the engine power output, and it is a measure to improve the fuel economy and power performance, but it will cause the engine speed and torque to decrease very rapidly. When the engine speed request closed-loop control and the torque request reduction value do not reach the torque value reduced by the fuel cut off under the current working condition, the engine is not allowed to cut off the fuel, otherwise the engine speed will drop out, which will deteriorate the power performance and comfort.

In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art:

Under the idling condition, the control of the engine idling fuel cut-off prohibition and recovery is not realized from the perspective of fuel economy, power and comfort.

In order to better cope with such a problem, it is necessary to distinguish between different working conditions related to idling speed, and prohibit the engine fuel cut request and fuel cut recovery, so as to improve the power performance, comfort and fuel economy under idling speed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a control method and system for prohibiting and recovering engine idling oil cut off in order to overcome the above-mentioned deficiencies of the background technology.

In one aspect, the present invention provides a control method for prohibiting and recovering engine idling oil cut-off, comprising the following steps:

Acquiring idle speed condition information of the engine, where the idle speed condition information includes the engine gear-in-gear condition, the clutch engagement condition, the real-time vehicle speed, and the transmission system request torque reduction condition, and compares the real-time vehicle speed with the preset vehicle speed value;

When it is detected that the engine is in gear, the clutch is fully engaged and the real-time vehicle speed is greater than the preset value of the vehicle speed, the engine idling fuel cut-off permission command is sent to the engine;

When it is detected that the transmission system requests torque reduction, the engine idling fuel cut off permission command is sent to the engine.

According to the first aspect, in a first possible implementation manner of the first aspect, the idle speed condition information includes the engine speed, the speed change rate, and the engine idle speed closed-loop control condition, and the "obtaining the engine idle speed condition information" , the idling speed condition information includes the engine gearing condition, the clutch engagement condition, the real-time vehicle speed, and the transmission system request torque reduction condition, and after the step of comparing the real-time vehicle speed and the vehicle speed preset value, it also includes the following steps:

Detecting the engine idling oil cut permission command, comparing the real-time speed difference between the engine speed and the speed preset value with the speed difference preset value, and comparing the engine speed change rate with the first change rate preset value, wherein The first preset value of the rate of change is set to a negative value;

When the engine idling oil cut off permission command is not detected, and it is detected that the real-time speed difference is less than the preset value of the speed difference, and the rate of change of the engine speed is less than the preset first value of the change rate, then Send the engine idling fuel cut-off prohibition command to the engine;

When the engine idling fuel cut off permission command is not detected, and it is detected that the engine enters the idling speed closed-loop control, the engine idling fuel cut off prohibition command is sent to the engine.

According to the first aspect, in a first possible implementation manner of the first aspect, the "when the engine idling oil cut-off permission command is not detected, and it is detected that the real-time speed difference is less than the preset speed difference value, and the rate of change of the engine speed is less than the preset value of the first rate of change, send the engine idling fuel cut-off prohibition command to the engine" step, which specifically includes the following steps:

Obtain the fixed set value C0 of the speed difference;

Get the speed difference fluctuation value C1;

Convert C1 and C0 to parameters according to formula 1 to obtain the preset value C of the rotational speed difference:

C=C0+C1(1);

When the engine idling fuel cut off permission command is not detected, it is detected that the real-time speed difference between the engine speed and the speed preset value is lower than the speed difference preset value C, and it is detected that the engine speed change rate is lower than When the first rate of change is a preset value, an engine idling fuel cut-off prohibition command is sent to the engine.

According to the first aspect, in a first possible implementation manner of the first aspect, the step of "obtaining the rotational speed difference fluctuation value C1" specifically includes the following steps:

Obtain the preset value C _Max of the maximum engine speed;

Obtain the preset value C _Min of the minimum engine speed;

Get the calculated engine speed C _Normal ;

Convert C _Max , C _Min and C _Normal according to formula (2) to obtain C1:

C1=Min(C _Max , Max(C _Min , C _Normal )) (2).

According to the first aspect, in a first possible implementation manner of the first aspect, the step of "obtaining the calculated engine speed C _Normal " specifically includes the following steps:

Detect the torque-reducing conditions of the transmission system;

When it is detected that the transmission system does not request torque reduction, the engine speed n, the engine load rho and the engine speed change rate dn are obtained, and the parameters of n, rho and dn are converted according to formula (3), and C _Normal is obtained:

C _Normal =-f(n,rho)×dn(3);

C _Normal is set to 0 when it is detected that the transmission system requires torque reduction.

According to the first aspect, in a first possible implementation manner of the first aspect, the step of "obtaining the preset value C _Max of the maximum engine speed" specifically includes the following steps:

Detect engine gear-shifting conditions and clutch engagement conditions;

When it is detected that the engine is in a gear state and the clutch is fully engaged, the preset maximum engine speed C _Max is set to the first preset upper limit value C _Max1 ; otherwise, the preset maximum engine speed C _Max is set to the second speed The preset upper limit value C _Max2 , where C _Max2 >C _Max1 .

According to the first aspect, in a first possible implementation manner of the first aspect, the "when the engine idling oil cut-off permission command is not detected, and when it is detected that the engine enters the idling closed-loop control, the engine idling fuel cut-off prohibition is sent. After the "command to the engine" step, it also includes the following steps:

Detect the activation and reset of the engine idle speed fuel cut-off prohibition command and the engine idle speed closed-loop control flag, and compare the engine speed change rate with the second change rate preset value;

When the engine idling fuel cut-off prohibition command is not detected, and it is detected that the engine idling closed-loop control flag was activated at the previous moment and reset at the current moment, the engine idling fuel cut-off permission command is sent to the engine;

When the engine idling fuel cut-off prohibition command is not detected, and a change in the state of the power chain is detected, the engine idling fuel cut-off permission command is sent to the engine, and the power chain state includes the engine gear-gear condition and the clutch engagement condition;

When it is detected that the rate of change of the engine speed is higher than the second preset value of the rate of change, the engine idling fuel cut off permission command is sent to the engine, wherein the preset value of the second rate of change is a positive value.

According to the first aspect, in a first possible implementation manner of the first aspect, in the "acquiring idle speed condition information of the engine, the idle speed condition information includes an engine gear-gear condition, a clutch engagement condition, a real-time Before the step of comparing the real-time vehicle speed and the vehicle speed preset value, the following steps are also included:

Check whether the calibration switch is activated;

When it is detected that the calibration switch is activated, the engine idling fuel cut-off prohibition command and the recovery function inactivation request are sent to the engine.

According to the first aspect, in a first possible implementation manner of the first aspect, after the step of "sending the engine idling fuel cut off permission command to the engine", the step further includes:

Get the engine request torque value;

Detect whether there is an engine idling oil cut-off prohibition command;

When it is detected that the requested torque value of the engine is less than the preset value of the minimum running torque of the engine, and the prohibition command of engine idling fuel cutoff is not detected, the engine idling fuel cutoff permission command is controlled to be executed.

In a second aspect, the present invention provides a control system for prohibiting and recovering engine idle speed fuel cutoff, comprising an acquisition module, a comparison module and an instruction sending module, the acquisition module is used to acquire idle speed condition information, and the idle speed condition information includes engine hanging Gear condition, clutch engagement condition, real-time vehicle speed, engine speed, speed change rate, transmission system request torque reduction condition and engine idle speed closed-loop control condition; the comparison module is used to compare the vehicle speed with the preset value of the vehicle speed; command sending The module is used to send the engine idling fuel cut off permission command or prohibit command to the engine according to the idling speed condition information.

Compared with the prior art, the advantages of the present invention are as follows:

The control method and system for prohibition and recovery of engine idling oil cutoff provided by the present invention achieve the stability of engine idling speed control by acquiring idling speed condition information of the engine, and sending idling oil cutoff permission or prohibition commands according to the idling speed condition information. and the comfort of the occupants.

Description of drawings

1 is a schematic flowchart of a method according to an embodiment of the present invention;

2 is a schematic flowchart of a method according to an embodiment of the present invention;

3 is a schematic flowchart of a method according to an embodiment of the present invention;

4 is a schematic flowchart of a method according to an embodiment of the present invention;

5 is a schematic diagram of each priority execution according to an embodiment of the present invention;

6 is a schematic flowchart of a method according to an embodiment of the present invention;

FIG. 7 is a block diagram of system function modules according to an embodiment of the present invention.

In the figure, 100, an acquisition module; 200, a comparison module; and 300, an instruction sending module.

Detailed ways

Reference will now be made in detail to specific embodiments of the present invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with specific embodiments, it will be understood that the intention is not to limit the invention to the described embodiments. On the contrary, the intention is to cover changes, modifications and equivalents included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may all be implemented by any functional block or arrangement of functions, and that any functional block or arrangement of functions may be implemented as physical or logical entities, or a combination of both.

In order to make those skilled in the art better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Note: The example to be introduced next is only a specific example, and is not intended to limit the embodiments of the present invention. It must be the following specific steps, values, conditions, data, sequences, and the like. Those skilled in the art can use the concept of the present invention to construct more embodiments not mentioned in this specification by reading this specification.

Referring to FIG. 1, an embodiment of the present invention provides a control method for prohibiting and recovering engine idling oil cut off, including the following steps:

S20. Acquire idling condition information of the engine, where the idling condition information includes the engine gear-shifting condition, the clutch engagement condition, the vehicle speed, the engine rotational speed, the rotational speed change rate, the transmission system requesting torque reduction condition, and the engine idling closed-loop control condition. condition, compare the vehicle speed with the preset value of the vehicle speed;

S21. When it is detected that the engine is in gear, the clutch is fully engaged, and the vehicle speed is greater than a preset value of the vehicle speed, send an engine idling fuel cut off permission command;

S22, when it is detected that the transmission system requests torque reduction, send an engine idle speed fuel cut off permission command.

As described above, according to the present application, the control priority level of steps S20, S21 and S22 in the above control method is priority level two.

Compared with the prior art, the advantages of the present invention are as follows:

The control method and system for prohibition and recovery of engine idling oil cutoff provided by the present invention achieve the stability of engine idling speed control by acquiring idling speed condition information of the engine, and sending idling oil cutoff permission or prohibition commands according to the idling speed condition information. and the comfort of the occupants.

As mentioned above, according to the present invention, the specific fuel cut is based on the engine torque request, when the engine transmission chain has been fully integrated and the vehicle speed is high, if the engine cuts off the fuel, the vehicle speed will not be significantly reduced after the fuel cut, and will not affect the power and performance of the vehicle. Comfort, so priority is given to fuel economy at this time; if the transmission system, such as the automatic transmission control unit TCU, requests torque reduction, it needs to respond to the request of the TCU first, and cutting off the fuel is the most direct and effective way.

In a preferred embodiment, please refer to FIG. 2 , the “obtaining the idle speed condition information of the engine, the idle speed condition information includes the engine gearing condition, the clutch engagement condition, the vehicle speed, the engine speed, the speed change rate. , the transmission system requests torque reduction condition and the engine idle speed closed-loop control condition, and compares the vehicle speed with the preset value of the vehicle speed; after the step, it also includes the following steps:

S30. Detect the engine idling fuel cut off permission command, compare the difference between the engine speed and the preset speed value and the difference preset value, and compare the engine speed change rate with the first change rate preset value, wherein, The first preset value of the rate of change is set to a negative value;

S31. When the engine idle speed fuel cut permission command is not detected, and it is detected that the difference between the engine speed and the speed preset value is lower than the difference preset value and the engine speed change rate is lower than the first When the rate of change is the preset value, the engine idling fuel cut-off prohibition command is sent;

S32 , when the engine idling oil cut-off permission command is not detected, and at the same time it is detected that the engine enters the idling-speed closed-loop control, the engine idling-speed fuel cut-off prohibition command is sent.

When the engine is about to enter idle speed control or is already in idle speed control, if there is a fuel cut, the engine speed will fluctuate greatly due to the fuel cut, which will affect the idle speed closed-loop control accuracy. At this time, priority is given to comfort.

As described above, according to the present application, the control priority level of steps S30, S31 and S32 in the above control method is priority level three.

In a preferred embodiment, the "when the engine idling oil cut-off permission command is not detected, the difference between the engine speed and the preset speed value is detected to be lower than the preset value of the difference value and the rate of change of the engine speed is lower than When the preset value of the first rate of change is set, the step of sending an engine idling oil cut-off prohibition instruction" specifically includes the following steps:

obtaining a fixed set value C0 of the difference value, and the fixed set value of the difference value C0 is determined by the fluctuation range of the engine speed after the engine is cut off from oil;

Get the difference fluctuation value C1;

Convert C1 and C0 to parameters according to formula 1 to obtain the difference preset value C:

C=C0+C1 formula 1;

When the difference between the engine speed and the speed preset value is lower than C and the engine speed change rate is lower than the first change rate preset value, the engine idling fuel cut-off prohibition command is sent.

In a preferred embodiment, the step of "obtaining the difference fluctuation value C1" specifically includes the following steps:

Obtain the preset value C _Max of the maximum engine speed;

Obtain the preset value C _Min of the minimum engine speed;

Get the calculated engine speed C _Normal ;

Convert C _Max , C _Min and C _Normal according to formula 2 to obtain C1:

C1=Min(C _Max , Max(C _Min , C _Normal )) Formula II.

In a preferred embodiment, the step of "obtaining the calculated engine speed C _Normal " specifically includes the following steps:

Detect the torque-reducing conditions of the transmission system;

When it is detected that the transmission system does not request torque reduction, the engine speed n, the engine load rho and the engine speed change rate dn are obtained, and the parameters of n, rho and dn are converted according to formula 3, and C _Normal is obtained:

C _Normal =-f(n,rho)×dn Equation 3;

-f(n,rho)×dn reflects the hysteresis of the engine speed, that is, the delay of the engine speed at the current engine speed and the current load, where f(n,rho) reflects the delay time of the system, and the calibration result of this value is given by the following The test is obtained: under the current speed n and the current load rho, set the target speed as the current speed and the fluctuation period of the actual speed. The reason why the calculated value C _Normal considers the engine speed hysteresis is that the current engine speed is not the result of the current idle speed control, but the speed after the system speed fluctuation period of the engine itself needs to be considered, so as to better cope with the control of the engine speed.

When it is detected that the transmission system requests torque reduction, C _Normal is set to 0. When the transmission system requests torque reduction, the difference between the actual speed and the target speed is allowed to be extremely small, and the engine is controlled to stop the oil cut, that is, the transmission system is given priority to respond to torque reduction. ask.

In a preferred embodiment, the step of "obtaining the maximum engine speed preset value CMax" specifically includes the following steps:

Detect engine gear-shifting conditions and clutch engagement conditions;

When it is detected that the engine is in a gear state and the clutch is fully engaged, the preset maximum engine speed C _Max is set to the first preset upper limit value C _Max1 , otherwise, the preset maximum engine speed C _Max is set to the second speed The preset upper limit value C _Max2 , where C _Max2 >C _Max1 , that is, after the engine is in gear and the clutch is fully engaged, the engine runs relatively stably, and the engine speed fluctuation caused by the allowable fuel cut off is small, and the fuel is given priority at this time. economical.

In a preferred embodiment, please refer to FIG. 3, after the step of “when the engine idling oil cut-off permission command is not detected, and it is detected that the engine enters the idling speed closed-loop control, the engine idling speed oil cut-off prohibition command is sent” step. Include the following steps:

S40. Detect the activation and reset of the engine idle speed fuel cut-off prohibition command and the engine idle speed closed-loop control flag, and compare the engine speed change rate with the second change rate preset value. When the engine speed is higher than the idle speed and the engine speed increases, the engine allows Fuel cut off, the fuel cut off is prohibited to recover, so that the fuel cut off is allowed when the engine speed is low, or the driver performs the repeated action of quickly releasing the accelerator after accelerating with a small accelerator, so as to meet the driver's drivability requirements;

S41. When the engine idling oil cut-off prohibition command is not detected, and it is detected that the engine idling closed-loop control flag was activated at the last moment, and the current moment is reset, that is, the state of the previous moment and the current moment are inconsistent, the engine idling fuel cut off permission command is sent ;

S42. When the engine idling oil cut-off prohibition command is not detected, and a change in the power chain state is detected, the engine idling oil cut-off permission command is sent, and the power chain state includes the engine gear-gear condition and the clutch engagement condition;

S43. When it is detected that the engine speed change rate is higher than the second change rate preset value, send an engine idle speed fuel cut off permission command, wherein the second change rate preset value is a positive value, when the engine speed is higher than the idle speed and When the engine speed rises, the engine is allowed to cut off the fuel, and the fuel cut off is prohibited to recover, so as to allow the fuel cut off when the engine speed is low, or when the driver performs repeated actions of quickly releasing the accelerator after accelerating with a small accelerator, to meet the driver's drivability requirements .

As described above, according to the present application, the control priority level of steps S40 , S41 , S42 and S43 in the above control method is priority level four.

In a preferred embodiment, please refer to FIG. 4 , in the “Acquiring the engine idle speed condition, the idle speed condition includes whether the clutch is in gear, the clutch engagement condition, the vehicle speed, whether the transmission system is in a torque-down state and the engine Idle speed closed-loop control condition;" step, it also includes the following steps:

S10. Detect whether the calibration switch is activated;

S11. When it is detected that the calibration switch is activated, a request for inactivation of the engine idling fuel cut-off prohibition and recovery function is sent.

As mentioned above, according to the present application, the calibration switch is a system switch, and the default state is enabled and activated. The system switch is selected and set by the calibration engineer according to the functional needs of different models. The calibration is realized through the software development function. The software is saved and set in the engine controller. Make function settings. In a specific embodiment, the stability of the idle speed control and the comfort of the occupants when riding a certain vehicle model, and the drivability, power and drivability of the driver's repeated actions of 'accelerating with a small accelerator - releasing the accelerator' at low speeds The "fuel economy" feeling is not good, the calibration engineer calibrates this function through the development software in the vehicle development and design stage, and sets the system switch to be active by turning off this function.

As described above, according to the present application, the control priority level of step S10 and step S11 in the above control method is priority one.

As described above, please refer to FIG. 5 , according to the present invention, the idle fuel cut-off control of priority one is the highest, and so on, the idle fuel cut-off of priority four is the lowest in the recovery control level.

As mentioned above, according to the present application, when steps S11, S21, S22, S21, S22, S31, and S32 are not satisfied, and any one of steps S41, S42, and S43 is satisfied once, the engine idle speed oil cutoff flag is maintained, That is, the engine idling fuel cut off permission command is sent.

In a preferred embodiment, please refer to FIG. 6, step S211 "send the engine idle speed fuel cut off permission command;" after the step, it also includes:

S212, obtain the torque value requested by the transmitter, and detect whether there is an engine idling oil cut-off prohibition instruction;

S213 , when it is detected that the requested torque value of the engine is less than the preset value of the minimum operating torque of the engine, and at the same time, the engine idling fuel cut off prohibition command is not detected, control the execution of the engine idling fuel cut off permission command.

When the engine idling fuel cut-off prohibition command is sent, the engine is finally not allowed to cut off the oil under the current condition, that is, regardless of whether any other conditions such as the engine idling fuel cut-off permission command are detected, the idling-speed fuel cut-off prohibition command is instructed, and the engine idling cut-off prohibition command is issued. The oil inhibit command has the highest execution priority.

Based on the same inventive concept, please refer to FIG. 7 , an embodiment of the present invention provides a control system for prohibiting and recovering engine idling oil cut off, including an acquisition module 100 , a comparison module 200 and an instruction sending module 300 , and the acquisition module 100 is used to acquire idle speed conditions information, the idle speed condition information includes the engine gearing condition, the clutch engagement condition, the vehicle speed, the engine speed, the speed change rate, the transmission system request torque reduction condition and the engine idle speed closed-loop control condition; the comparison module 200 is used to compare the vehicle speed and the preset value of the vehicle speed; the command sending module 300 sends the engine idle speed fuel cut off permission or prohibition command according to the idle speed operating condition information.

Based on the same inventive concept, the embodiments of the present application also provide a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, all or part of the method steps of the above method are implemented.

The present invention realizes all or part of the process in the above method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can realize The steps of each of the above method embodiments. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access Memory (RAM, RandomAccess Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in computer-readable media may be appropriately increased or decreased in accordance with the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include Electrical carrier signals and telecommunication signals.

Based on the same inventive concept, an embodiment of the present application also provides an electronic device, including a memory and a processor, where a computer program running on the processor is stored in the memory, and when the processor executes the computer program, all the method steps in the above method or Some method steps.

The processor may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf processors Programmable Gate Array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The processor is the control center of the computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

The memory can be used to store computer programs and/or modules, and the processor implements various functions of the computer device by running or executing the computer programs and/or modules stored in the memory and calling data stored in the memory. The memory can mainly include a stored program area and a stored data area, wherein the stored program area can store the operating system and the application program required for at least one function (such as sound playback function, image playback function, etc.); Use the created data (eg audio data, video data, etc.). In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, internal memory, plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

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

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in 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 the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flows of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. a control method of engine idling oil-cutting prohibition and recovery, is characterized in that, comprises the following steps: Acquiring idle speed condition information of the engine, where the idle speed condition information includes the engine gear-in-gear condition, the clutch engagement condition, the real-time vehicle speed, and the transmission system request torque reduction condition, and compares the real-time vehicle speed with the preset vehicle speed value; When it is detected that the engine is in gear, the clutch is fully engaged and the real-time vehicle speed is greater than the preset value of the vehicle speed, the engine idling fuel cut-off permission command is sent to the engine; When it is detected that the transmission system requests torque reduction, the engine idling fuel cut off permission command is sent to the engine. 2. The control method for prohibiting and recovering engine idling oil cut-off according to claim 1, wherein the idling condition information includes engine speed, speed change rate and engine idling closed-loop control condition, and the “obtaining the engine idling speed condition information, the idling speed condition information includes the engine gearing condition, the clutch engagement condition, the real-time vehicle speed, and the transmission system request torque reduction condition, and compare the real-time vehicle speed and the preset value of the vehicle speed" After the step, Also includes the following steps: Detecting the engine idling oil cut permission command, comparing the real-time speed difference between the engine speed and the speed preset value with the speed difference preset value, and comparing the engine speed change rate with the first change rate preset value, wherein The first preset value of the rate of change is set to a negative value; When the engine idling oil cut off permission command is not detected, and it is detected that the real-time speed difference is less than the preset value of the speed difference, and the rate of change of the engine speed is less than the preset first value of the change rate, then Send the engine idling fuel cut-off prohibition command to the engine; When the engine idling fuel cut off permission command is not detected, and it is detected that the engine enters the idling speed closed-loop control, the engine idling fuel cut off prohibition command is sent to the engine. 3. The control method for prohibiting and recovering engine idling oil cutoff as claimed in claim 2, wherein said "when the engine idling oil cutoff permission command is not detected, and the real-time speed difference is detected to be less than the When the speed difference preset value and the engine speed change rate is less than the first change rate preset value, send the engine idling oil cut-off prohibition command to the engine" step, which specifically includes the following steps: Obtain the fixed set value C0 of the speed difference; Get the speed difference fluctuation value C1; Convert C1 and C0 to parameters according to formula 1 to obtain the preset value C of the rotational speed difference: C=C0+C1(1); When the engine idling fuel cut off permission command is not detected, it is detected that the real-time speed difference between the engine speed and the speed preset value is lower than the speed difference preset value C, and it is detected that the engine speed change rate is lower than When the first rate of change is a preset value, an engine idling fuel cut-off prohibition command is sent to the engine. 4. The control method for prohibiting and recovering engine idling oil cut-off as claimed in claim 3, wherein the step of "obtaining the rotational speed difference fluctuation value C1" specifically comprises the following steps: Obtain the preset value C _Max of the maximum engine speed; Obtain the preset value C _Min of the minimum engine speed; Get the calculated engine speed C _Normal ; Convert C _Max , C _Min and C _Normal according to formula (2) to obtain C1: C1=Min(C _Max , Max(C _Min , C _Normal )) (2). 5. The control method of engine idling oil-cutting prohibition and recovery as claimed in claim 4, wherein the step of "obtaining the calculated engine speed C _Normal " specifically comprises the following steps: Detect the torque-reducing conditions of the transmission system; When it is detected that the transmission system does not request torque reduction, the engine speed n, the engine load rho and the engine speed change rate dn are obtained, and the parameters of n, rho and dn are converted according to formula (3), and C _Normal is obtained: C _Normal =-f(n,rho)×dn(3); C _Normal is set to 0 when it is detected that the transmission system requires torque reduction. 6. The control method for prohibiting and recovering engine idling oil cut-off as claimed in claim 4, wherein the step of "obtaining the maximum engine speed preset value C _Max " specifically comprises the following steps: Detect engine gear-shifting conditions and clutch engagement conditions; When it is detected that the engine is in a gear state and the clutch is fully engaged, the preset maximum engine speed C _Max is set to the first preset upper limit value C _Max1 ; otherwise, the preset maximum engine speed C _Max is set to the second speed The preset upper limit value C _Max2 , where C _Max2 >C _Max1 . 7. The control method for prohibiting and recovering from engine idling oil cut off as claimed in claim 2, wherein the “when the engine idling oil cut off permission command is not detected and the engine enters into idling closed-loop control is detected, then send The following steps are included after the step of "Instructing the Engine to Inhibit Fuel Cut at Idle Speed to the Engine": Detect the activation and reset of the engine idle speed fuel cut-off prohibition command and the engine idle speed closed-loop control flag, and compare the engine speed change rate with the second change rate preset value; When the engine idling fuel cut-off prohibition command is not detected, and it is detected that the engine idling closed-loop control flag was activated at the previous moment and reset at the current moment, the engine idling fuel cut-off permission command is sent to the engine; When the engine idling fuel cut-off prohibition command is not detected, and a change in the state of the power chain is detected, the engine idling fuel cut-off permission command is sent to the engine, and the power chain state includes the engine gearing condition and the clutch engagement condition; When it is detected that the rate of change of the engine speed is higher than the second preset value of the rate of change, the engine idling fuel cut off permission command is sent to the engine, wherein the preset value of the second rate of change is a positive value. 8. The control method for prohibiting and recovering engine idling oil cut-off according to claim 1, characterized in that, in the "obtaining the idling condition information of the engine, the idling condition information comprises the Before the step of comparing the real-time vehicle speed and the preset value of the vehicle speed in combination with the working conditions, the real-time vehicle speed, and the torque-reduction conditions requested by the transmission system, the following steps are also included: Check whether the calibration switch is activated; When it is detected that the calibration switch is activated, the engine idling fuel cut-off prohibition command and the recovery function inactivation request are sent to the engine. 9. The control method for prohibiting and recovering engine idling fuel cutoff as claimed in claim 1, wherein after the step of "sending the engine idling fuel cutoff permission command to the engine", it further comprises: Get the engine request torque value; Detect whether there is an engine idling oil cut-off prohibition command; When it is detected that the requested torque value of the engine is less than the preset value of the minimum running torque of the engine, and the prohibition command of engine idling fuel cutoff is not detected, the engine idling fuel cutoff permission command is controlled to be executed. 10. A control system for prohibition and recovery of engine idling oil cut off, characterized in that, comprising: The acquisition module is used to acquire idle speed condition information, the idle speed condition information includes the engine gearing condition, the clutch engagement condition, the real-time vehicle speed, the engine speed, the speed change rate, the transmission system request torque reduction condition and the engine idle speed closed loop control conditions; a comparison module for comparing the vehicle speed with a preset value of the vehicle speed; The command sending module is used for sending the engine idling oil cut off permission command or prohibition command to the engine according to the idling speed condition information.

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