CN114738128B

CN114738128B - Control method and device of turbocharged engine and turbocharged engine

Info

Publication number: CN114738128B
Application number: CN202210433547.5A
Authority: CN
Inventors: 李洪波; 张福根; 丁万荞; 王贵民; 孙艳兵; 宋超; 安然
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2023-05-23
Anticipated expiration: 2042-04-24
Also published as: CN114738128A

Abstract

The application provides a control method and device of a turbocharged engine and the turbocharged engine, wherein the method comprises the following steps: and when the turbosupercharged engine is judged to enter a first working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve. The method can reduce the oil consumption rate of the turbocharged engine during low-load operation.

Description

Control method and device of turbocharged engine and turbocharged engine

Technical Field

The present disclosure relates to the field of automotive electronics, and in particular, to a control method and apparatus for a turbocharged engine, and a turbocharged engine.

Background

The turbocharger includes a turbine and a compressor coupled to the turbine, the compressor being driven by the turbine to increase the intake pressure above atmospheric pressure to increase the power output from the engine.

Conventional turbocharged engines use a turbocharger for boosting across the entire engine speed range, which significantly reduces engine fuel consumption when the engine is operating at high loads. However, in low-load operation, pumping loss is relatively large, and the turbocharged engine has high fuel consumption rate in low-load operation.

Disclosure of Invention

The embodiment of the application provides a control method and device of a turbocharged engine and the turbocharged engine, which can reduce the oil consumption rate of the turbocharged engine in low-load operation.

In a first aspect, embodiments of the present application provide a method of controlling a turbocharged engine comprising a turbine and a compressor in combination with a turbine of the turbine, the turbine being provided with an exhaust gas control valve bypassing the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; the method comprises the following steps:

monitoring a rotational speed and a cyclical oil supply of the turbocharged engine;

if the turbocharged engine is judged to enter a first working condition, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters a cylinder through the air inlet one-way valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value, and the circulating oil supply quantity is smaller than a preset second threshold value.

In the above method, the turbine is provided with an exhaust gas control valve that bypasses the turbine; the compressor is provided with an air inlet one-way valve which enables the compressor to bypass in one way, the rotation speed and the circulating oil supply amount of the turbocharged engine are monitored, when the turbocharged engine is judged to enter a first working condition that the rotation speed is smaller than a preset first threshold value and the circulating oil supply amount is smaller than a preset second threshold value, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve. According to the method, when the turbocharged engine enters a first working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value, external air enters the cylinder through the air inlet one-way valve for enabling the compressor to bypass in one way by opening the exhaust control valve for enabling the turbine to bypass, the turbocharged engine can work in a natural air suction mode under low load based on the rotating speed and the circulating oil supply quantity, the influence of pumping loss is reduced, and therefore the oil consumption rate of the turbocharged engine under low load operation is reduced.

In one possible implementation manner, if the turbocharged engine is judged to enter the first working condition, controlling the exhaust gas control valve to be opened includes:

if the turbocharged engine is judged to enter a first working condition, monitoring the duration of the first working condition when the turbocharged engine enters the first working condition;

and if the first working condition duration is monitored to be longer than a preset third threshold value, controlling the exhaust control valve to be opened.

According to the method, after the turbocharged engine is judged to enter the first working condition, the duration of the first working condition when the turbocharged engine enters the first working condition is monitored, and when the duration of the first working condition is monitored to be longer than a preset third threshold value, the exhaust control valve is controlled to be opened. According to the method, after the turbocharged engine enters the first working condition and lasts for a set period of time, the exhaust control valve is controlled to be opened, a stable low-load working condition can be identified, unnecessary opening of the exhaust control valve is reduced, the influence of pumping loss can be reduced more effectively, and the oil consumption rate of the turbocharged engine in low-load operation is reduced effectively.

In one possible implementation, the determining that the turbocharged engine enters the first operating condition includes:

And if the current monitored rotating speed is smaller than the first threshold, the current monitored circulating oil supply quantity is smaller than the second threshold, the previous monitored rotating speed is larger than or equal to a preset first threshold, the previous monitored circulating oil supply quantity is larger than or equal to the second threshold, and the turbocharged engine is judged to enter a first working condition.

According to the method, if the current monitored rotating speed is smaller than the first threshold, the current monitored circulating oil supply is smaller than the second threshold, the rotating speed monitored in the previous time is larger than or equal to a preset first threshold, the circulating oil supply monitored in the previous time is larger than or equal to the second threshold, and the turbocharged engine is judged to enter a first working condition. According to the method, whether the first working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value is judged according to the rotating speed and the circulating oil supply quantity which are monitored each time, the condition that the turbocharged engine enters the first working condition can be accurately identified, so that the influence of pumping loss can be effectively reduced, and the oil consumption rate of the turbocharged engine in low-load operation is effectively reduced.

In one possible implementation, the method further includes:

if the turbocharged engine is judged to enter a second working condition or a third working condition, the exhaust control valve is controlled to be closed, so that waste gas is discharged through the turbine, and external air enters a cylinder through the compressor; the second working condition is a working condition that the rotating speed is smaller than the first threshold value, and the circulating oil supply amount is larger than or equal to the second threshold value; the third working condition is a working condition meeting that the rotating speed is larger than the first threshold value.

According to the method, if the turbocharged engine is judged to enter a second working condition that the rotating speed is smaller than the first threshold value and the circulating oil supply quantity is larger than or equal to the second threshold value or enter a third working condition that the rotating speed is larger than the first threshold value, the exhaust control valve is controlled to be closed, so that waste gas is discharged through the turbine, and external air enters a cylinder through the air compressor. The method can also identify whether the turbocharged engine enters a second working condition that the rotating speed is smaller than the first threshold value and the circulating oil supply amount is larger than or equal to the second threshold value or enters a third working condition that the rotating speed is larger than the first threshold value, so that the turbocharged engine can work in a turbocharging mode under the conditions of large load and set medium load, the power output by the engine under the conditions of large load and set medium load is improved, the oil consumption rate of the turbocharged engine under the condition of low load operation is reduced, and better balance between performance and oil consumption rate is achieved for the turbocharged engine.

In one possible implementation manner, if the turbocharged engine is judged to enter the second working condition or the third working condition, controlling the exhaust gas control valve to be closed includes:

if the turbocharged engine is judged to enter the second working condition, monitoring the duration of the second working condition when the turbocharged engine enters the second working condition; and if the turbocharged engine is judged to enter the third working condition, monitoring the duration of the third working condition when the turbocharged engine enters the third working condition;

and if the duration of the second working condition or the duration of the third working condition is monitored to be longer than a preset fourth threshold value, controlling the exhaust control valve to be opened.

According to the method, after the turbocharged engine enters the second working condition or the third working condition and lasts for a set period of time, the exhaust control valve is controlled to be closed, a stable large-load working condition or a medium-load working condition can be identified, unnecessary closing of the exhaust control valve is reduced, the influence of pumping loss can be reduced more stably, and the oil consumption rate of the turbocharged engine in low-load operation is further reduced.

In a second aspect, embodiments of the present application provide a control apparatus for a turbocharged engine comprising a turbine and a compressor coupled to a turbine of the turbine, the turbine being provided with an exhaust gas control valve bypassing the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; the device comprises:

The parameter acquisition module is used for monitoring the rotating speed and the circulating oil supply quantity of the turbocharged engine;

the ventilation control module is used for controlling the exhaust control valve to be opened if the turbocharged engine is judged to enter a first working condition, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value, and the circulating oil supply quantity is smaller than a preset second threshold value.

In one possible implementation manner, the ventilation control module is specifically configured to:

In one possible implementation, the ventilation control module is further configured to:

In a third aspect, an embodiment of the present application provides an electronic device, including a processor and a memory, where the memory stores program code that, when executed by the processor, causes the processor to perform the steps of the method for controlling a turbocharged engine of any one of the above.

In a fourth aspect, embodiments of the present application provide a computer readable storage medium having a computer program stored therein, which when executed by a processor, implements a method of controlling a turbocharged engine of any one of the above.

In a fifth aspect, embodiments of the present application provide a turbocharged engine comprising a turbine and a compressor in combination with a turbine of the turbine, the turbine being provided with an exhaust gas control valve bypassing the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; the turbocharged engine further comprises:

a control unit for monitoring the rotational speed and the circulating oil supply of the turbocharged engine; if the turbocharged engine is judged to enter a first working condition, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters a cylinder through the air inlet one-way valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value, and the circulating oil supply quantity is smaller than a preset second threshold value.

In one possible implementation, the first flow cross-sectional area of the intake check valve is greater than the second flow cross-sectional area of the compressor.

The technical effects caused by any implementation manner of the second aspect to the fifth aspect may be referred to the technical effects caused by the implementation manner of the first aspect, and are not described herein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a control architecture of a turbocharged engine according to an embodiment of the present application;

FIG. 2 is a flow chart of a method for controlling a turbocharged engine according to an embodiment of the present disclosure;

fig. 3 is a schematic flow chart of an exhaust control valve opening control method of a turbocharged engine according to an embodiment of the present application;

FIG. 4 is a schematic flow chart of a control method for controlling closing of an exhaust control valve of a turbocharged engine according to an embodiment of the present disclosure;

FIG. 5 is a flow chart of another method of controlling a turbocharged engine according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a control device of a turbocharged engine according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings, wherein it is apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Some of the terms in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

(1) And (3) ECU: (Electronic Control Unit ): the ECU is also called an "engine electronic control unit", and is a controller that performs computation, processing, and judgment according to signals input from the sensors, and then outputs instructions to control the operation of the actuator. The ECU is typically composed of a microprocessor (CPU), memory (ROM, RAM), input/output interfaces (I/O), analog-to-digital converters (a/D), and shaped large scale integrated circuits.

(2) Turbocharged engines: the turbocharged engine is characterized in that exhaust gas of the engine is utilized to push a turbine to rotate, so that a coaxial impeller is driven to rotate, the impeller compresses air which is filtered from air to enable the air to be supercharged into a cylinder, and the air inflow of the engine is improved.

(3) Natural aspiration: natural aspiration refers to that air from an air filter is directly conveyed into a cylinder by atmospheric pressure, and mixed combustion is carried out with fuel oil in the cylinder to generate power.

(4) Fuel consumption rate: which may also be referred to as fuel consumption, refers to the amount of fuel that is effectively consumed per hour, typically expressed as fuel consumption per kilowatt-hour. The fuel consumption rate is typically in grams per kilowatt hour.

In order to reduce the oil consumption rate of a turbocharged engine during low-load operation, the embodiment of the application provides a control method and device of the turbocharged engine and the turbocharged engine. In order to better understand the technical solution provided by the embodiments of the present application, a simple description is made here of the basic principle of the solution.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures 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 such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

The following describes the technical scheme provided by the embodiment of the application with reference to the accompanying drawings.

In view of this, embodiments of the present application provide a control method and apparatus for a turbocharged engine, and a turbocharged engine, the turbine being provided with an exhaust gas control valve that bypasses the turbine; the compressor is provided with an air inlet one-way valve which enables the compressor to bypass in one way, through monitoring the rotating speed and the circulating oil supply quantity of the turbocharged engine, when the turbocharged engine is judged to enter a first working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve. According to the method, when the turbocharged engine enters a first working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value, external air enters the cylinder through the air inlet one-way valve for enabling the compressor to bypass in one direction by opening the exhaust control valve for enabling the turbine to bypass, the turbocharged engine can work in a natural air suction mode under low load based on the rotating speed and the circulating oil supply quantity, the influence of pumping loss is reduced, and therefore the oil consumption rate of the turbocharged engine under low load operation is reduced.

The preferred embodiments of the present application will be described below with reference to the accompanying drawings of the specification, it being understood that the preferred embodiments described herein are for illustration and explanation only, and are not intended to limit the present application, and embodiments of the present application and features of the embodiments may be combined with each other without conflict.

The turbocharged engine comprises a turbine and a compressor combined with the turbine of the turbine, wherein the turbine is provided with an exhaust gas control valve for bypassing the turbine; the compressor is provided with an air inlet one-way valve which enables the compressor to bypass in one way.

In the embodiment of the application, when the air compressor works, negative pressure is generated at the air compressor, the air compressor compresses air and conveys the air to the air inlet pipe of the engine, and at the moment, the air inlet one-way valve is in a non-conducting state; when the air compressor does not work, the resistance of the air compressor is high, and the air inlet is directly conveyed to the air inlet pipe of the engine through the air inlet one-way valve, so that the air inlet one-way valve is in a conducting state. In an embodiment of the present application, the air intake check valve may be an air intake check butterfly valve. It will be appreciated that the intake check butterfly valve is only one of the forms that the intake check valve of the present application may take, and that embodiments of the present application are not particularly limited to a particular form of intake check valve.

Fig. 1 shows a schematic diagram of a control structure of a turbocharged engine according to an embodiment of the present application. As shown in fig. 1, the turbocharged engine 10 includes: the turbocharger 100, the host computer 200, an air cleaner 301, an intercooler 302, an intake pipe 303, a cylinder 304, an exhaust pipe 305, and an exhaust tail pipe 306. The turbocharger 100 includes a turbine 1001 and a compressor 1002 coupled to a turbine of the turbine 1001, and the turbine 1001 is provided with an exhaust gas control valve 1003 for bypassing the turbine 1001; the compressor 1002 is provided with an intake check butterfly valve 1004 that allows the compressor 1002 to bypass in one direction. The host computer 200 is connected to the exhaust control valve 1003 in a communication manner. Those skilled in the art will appreciate that the control structure of the turbocharged engine 10 shown in FIG. 1 does not constitute a limitation of the turbocharged engine 10, and that more components than shown may be included, or certain components may be combined. The control principle of the turbocharged engine 10 is specifically described below in conjunction with fig. 1:

when the upper computer 200 recognizes that the turbocharged engine 10 is in the heavy load operation, the exhaust control valve 1003 is closed, the exhaust gas discharged by the exhaust pipe 305 enters the turbine 1001 to push the turbine to operate, and then the impeller of the coaxial compressor 1002 is driven to rotate to compress air, so that the air inflow is improved; when the upper computer 200 recognizes that the turbocharged engine 10 is in low load operation, the exhaust control valve 1003 is opened, the exhaust gas discharged from the exhaust pipe 305 directly enters the tail pipe 306 through the exhaust control valve 1003, the turbine 1001 and the compressor 1002 do not work, because the resistance of the compressor 1002 is large, the resistance of the one-way conduction of the air inlet one-way butterfly valve is much smaller than that of the compressor 1002, the air inlet conveyed by the air filter 301 directly enters the intercooler 302 through the air inlet one-way butterfly valve 1004 and then enters the cylinder 304 for combustion, and at the moment, the turbocharged engine 10 is automatically switched to a natural air suction mode for operation.

In some embodiments, the flow area of the intake one-way butterfly valve of the turbocharged engine 10 may also be made larger than the cross-sectional flow area of the compressor. Thus, when the turbine 1001 and the compressor 1002 are not in operation, the ratio of the resistance of the unidirectional conduction of the air inlet unidirectional butterfly valve to the resistance of the compressor 1002 is smaller, so that the air inlet conveyed by the air filter 301 can more efficiently enter the intercooler 302 directly through the air inlet unidirectional butterfly valve 1004 and then enter the cylinder 304 for combustion.

The control method of the turbocharged engine provided in the embodiment of the present application is further explained below. In an embodiment of the present application, a turbocharged engine includes a turbine provided with an exhaust gas control valve that bypasses the turbine, and a compressor coupled to the turbine of the turbine; the compressor is provided with an air inlet one-way valve which enables the compressor to bypass in one way, as shown in fig. 2, and the control method of the turbocharged engine comprises the following steps:

in step S201, the rotational speed and the circulating oil supply amount of the turbocharged engine are monitored.

Specifically, in the process of controlling the turbocharged engine, the rotating speed and the circulating oil supply amount of the turbocharged engine can be monitored in real time through the upper computer.

In the embodiment of the present application, the upper computer may be an ECU.

Step S202, if it is determined that the turbocharged engine enters the first working condition, the exhaust control valve is controlled to be opened, so that the exhaust gas is discharged through the exhaust control valve, and the external air enters the cylinder through the air inlet one-way valve.

The first working condition is a working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value.

During implementation, the first working condition is set to be a working condition that the rotating speed is smaller than a preset first threshold value, and the circulating oil supply quantity is smaller than a preset second threshold value, so that the working condition with lower load can be distinguished according to specific requirements, when the condition that the turbocharged engine enters the working condition with lower load is judged, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve, the turbocharged engine is enabled to work in a natural air suction mode under the working condition with lower load, the influence of pumping loss is reduced, and the oil consumption rate of the turbocharged engine in low-load operation is reduced.

For example, assume that the first threshold is 1000rpm, the second threshold is 200mL/st, and operating state_1 is an operating condition that satisfies a rotational speed of less than 1000rpm, and the circulating oil supply is less than 200 mL/st. If the inlet working condition state_1 of the turbocharged engine is judged, the exhaust control valve is controlled to be opened, so that the exhaust gas is discharged through the exhaust control valve, and the external air enters the cylinder through the air inlet one-way valve.

In the embodiment of the application, after the turbocharged engine is judged to enter the first working condition, the duration of the first working condition when the turbocharged engine enters the first working condition can be monitored, and when the duration of the first working condition is monitored to be longer than a preset third threshold value, the exhaust control valve is controlled to be opened. The method can eliminate unnecessary response to the working condition with low instantaneous load when the working condition is unstable, identify the working condition with stable low load, reduce unnecessary opening of the exhaust control valve, effectively reduce the influence of pumping loss and effectively reduce the oil consumption rate of the turbocharged engine during low-load operation.

In one possible implementation, if it is determined that the turbocharged engine enters the first working condition, the exhaust control valve is controlled to be opened, as shown in fig. 3, by the following steps:

in step S301, if it is determined that the turbocharged engine enters the first working condition, a first working condition duration of the turbocharged engine entering the first working condition is monitored.

For example, if the turbocharged engine entry state_1 is determined, the State duration state_1_time of the turbocharged engine entry state_1 is monitored.

In one possible implementation, the monitoring of the duration of the first condition of the turbocharged engine into the first condition may be specifically implemented by:

A1, triggering a timer to count.

A2, taking the count of the timer at the current moment as the duration of the first working condition.

In the embodiment of the present application, in the process of monitoring the duration of the first working condition, if the rotation speed at any moment is greater than or equal to a first threshold value, or the circulating oil supply amount at any moment is greater than a preset second threshold value, the duration of the first working condition is zeroed, and the timing of the timer is stopped.

In one possible implementation, the determination that the turbocharged engine enters the first operating condition is specifically implemented by: if the current monitored rotating speed is smaller than the first threshold value, the current monitored circulating oil supply is smaller than the second threshold value, the previous monitored rotating speed is larger than or equal to the preset first threshold value, and the previous monitored circulating oil supply is larger than or equal to the second threshold value, the turbocharged engine is judged to enter the first working condition.

For example, if the current monitored rotation speed is less than 1000rpm, the current monitored circulation oil supply amount is less than 200mL/st, the previous monitored rotation speed is greater than or equal to a preset 1000rpm, the previous monitored circulation oil supply amount is greater than or equal to 200mL/st, and then the condition state_1 of the turbocharger engine entering is judged.

And step S302, if the duration of the first working condition is monitored to be longer than a preset third threshold value, the exhaust control valve is controlled to be opened.

In particular, the third threshold may be set to a smaller duration, for example 1 second or 2 seconds.

For example, assuming a third threshold of 2 seconds, if the operating State duration state_1_time for operating state_1 is monitored to be greater than 2 seconds, the exhaust control valve is controlled to open.

In one possible implementation, the process of controlling the turbocharged engine further comprises:

if the turbocharged engine is judged to enter the second working condition or the third working condition, the exhaust control valve is controlled to be closed, so that the exhaust gas is discharged through the turbine, and the external air enters the cylinder through the compressor.

The second working condition is a working condition that the rotating speed is smaller than a first threshold value and the circulating oil supply amount is larger than or equal to a second threshold value; the third working condition is a working condition meeting the condition that the rotating speed is larger than the first threshold value.

In the specific implementation, the second working condition is set to be a working condition that the rotating speed is smaller than the first threshold and the circulating oil supply amount is larger than or equal to the second threshold; the third working condition is set to meet the working condition that the rotating speed is larger than the first threshold, the working condition with medium load and the working condition with higher load can be distinguished efficiently according to specific requirements, so that when the condition that the turbocharged engine enters the working condition with medium load or the working condition with higher load is judged, the exhaust control valve is controlled to be closed, so that waste gas is discharged through the turbine, and external air enters the cylinder through the air compressor, the turbocharged engine works in a turbocharging mode under the conditions of large load and set medium load, the power output by the engine under the conditions of large load and set medium load is improved, the oil consumption rate of the turbocharged engine under the condition of low load is reduced, and better balance between performance and the oil consumption rate is achieved for the turbocharged engine.

For example, assuming a first threshold of 1000rpm and a second threshold of 200mL/st, operating state_2 is an operating condition that satisfies a rotational speed of less than 1000rpm and a circulating oil supply of greater than or equal to 200 mL/st; the working condition State_3 is a working condition meeting the rotating speed of more than 1000 rpm. In the control process of the turbocharged engine, if the turbocharged engine is judged to enter the working condition State_2 or the working condition State_3, the exhaust control valve is controlled to be closed, so that the exhaust gas is discharged through the turbine, and the external air enters the cylinder through the compressor.

In the embodiment of the present application, the first threshold, the second threshold, and the third threshold may be specifically set according to actual needs, and stored in an ECU of the turbocharged engine, for example, in an upper computer in fig. 1.

In one possible implementation, as shown in fig. 4, if it is determined that the turbocharged engine enters the second or third operating condition, controlling the exhaust control valve to be closed includes:

step S401, if the turbocharged engine is judged to enter a second working condition, monitoring the duration of the second working condition when the turbocharged engine enters the second working condition; and if the turbocharged engine is judged to enter the third working condition, monitoring the duration of the third working condition when the turbocharged engine enters the third working condition.

For example, assume that turbocharged engine entry state_2 is determined, and that the condition duration state_2_time of turbocharged engine entry state_2 is monitored.

In the specific implementation, the second working condition duration of the turbocharged engine entering the second working condition is judged, and the second working condition duration of the turbocharged engine entering the second working condition is monitored, which may be that when the turbocharged engine entering the second working condition is judged, a timer is triggered to count, and the count of the timer at the current moment is used as the second working condition duration of the turbocharged engine entering the second working condition.

It can be understood that, in the process of judging that the turbocharged engine enters the second working condition and monitoring the duration of the second working condition, if the turbocharged engine at any moment is judged to jump out of the second working condition, the monitored duration of the second working condition is reset to zero, and the timing of the timer is stopped.

The process of monitoring the duration of the third working condition is similar to the process of monitoring the duration of the second working condition, and the same points are not repeated.

For example, after the turbocharger engine entering the working condition state_2 is determined, in the process of monitoring the working condition duration state_2_time of the turbocharger engine entering the working condition state_2, if the turbocharger engine at any moment is monitored to jump out of the working condition state_2, for example, to enter the working condition state_1 or the working condition state_3, the monitored working condition duration state_2_time of the turbocharger engine entering the working condition state_2 is zeroed, and the timing of the timer is stopped.

Step S402, if the second working condition duration or the third working condition duration is monitored to be longer than a preset fourth threshold value, the exhaust control valve is controlled to be opened.

In embodiments of the present application, the fourth threshold may be the same as or different from the third threshold.

For example, assuming a fourth threshold of 1 second, if the operating condition duration State_2_Time is monitored to be greater than 1 second, the exhaust control valve is controlled to open.

In the control method of the turbocharged engine according to the embodiment of the application, the turbine is provided with an exhaust gas control valve that bypasses the turbine; the compressor is provided with an air inlet one-way valve which enables the compressor to bypass in one way, through monitoring the rotating speed and the circulating oil supply quantity of the turbocharged engine, when the turbocharged engine is judged to enter a first working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve. According to the method, when the turbocharged engine enters a first working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value, external air enters the cylinder through the air inlet one-way valve for enabling the compressor to bypass in one direction by opening the exhaust control valve for enabling the turbine to bypass, the turbocharged engine can work in a natural air suction mode under low load based on the rotating speed and the circulating oil supply quantity, the influence of pumping loss is reduced, and therefore the oil consumption rate of the turbocharged engine under low load operation is reduced.

Another method for controlling a turbocharged engine according to an embodiment of the present application is described below. The control method of the turbocharged engine, as shown in fig. 5, includes the steps of:

in step S501, the rotational speed and the circulating oil supply amount of the turbocharged engine are monitored.

Step S502, judging whether the rotating speed is smaller than a preset first threshold value. If yes, go to step S503; if not, go to step S507.

Step S503, determining whether the circulating oil supply amount is smaller than a preset second threshold. If yes, go to step S504; if not, go to step S507.

In step S504, a first operating condition duration of the turbocharged engine entering a first operating condition is monitored.

It should be noted that, in the present application, determining that the turbocharged engine enters the target working condition refers to a condition that the turbocharged engine does not meet the target working condition when monitored last time, and a condition that the turbocharged engine meets the target working condition when monitored currently; the working condition duration of the turbocharged engine entering the target working condition refers to a duration from the time of judging that the turbocharged engine enters the target working condition, and the condition that the turbocharged engine does not meet the target working condition is not monitored within the duration.

In specific implementation, if the current monitored rotating speed is smaller than a first threshold, the current monitored circulating oil supply amount is smaller than a second threshold, the previous monitored rotating speed is larger than or equal to a preset first threshold, the previous monitored circulating oil supply amount is larger than or equal to the second threshold, and the turbocharged engine is judged to enter a first working condition.

The monitoring of the duration of the first condition of the turbocharged engine into the first condition may be performed by: and in response to judging that the turbocharged engine enters the first working condition, triggering a timer to count, and taking the count of the timer at the current moment as the working condition duration of the turbocharged engine entering the first working condition.

And in the process of monitoring the duration of the first working condition of the turbocharged engine entering the first working condition, if the rotating speed at any moment is greater than or equal to a first threshold value or the circulating oil supply quantity at any moment is greater than a preset second threshold value, the duration of the working condition is reset to zero.

In step S505, it is monitored whether the duration of the first working condition is greater than a preset third threshold. If yes, go to step S506; if not, return to step S502.

In step S506, the exhaust control valve is controlled to be opened.

And step S507, if the turbocharged engine is judged to enter the second working condition or the third working condition, the exhaust control valve is controlled to be closed.

And if the ECU judges that the turbocharged engine enters the second working condition or the third working condition, the exhaust control valve is controlled to be closed.

In the embodiment of the present application, the process of determining that the turbocharged engine enters the second working condition or the third working condition may refer to the process of determining that the turbocharged engine enters the first working condition.

The process of controlling the turbocharged engine in steps S501 to S507 may be performed with reference to the specific process of the foregoing embodiment, and the same points are not described here again.

The control method of the turbocharged engine is simple and easy to implement, achieves the aim of controlling the turbocharged engine through ECU program setting, optimizes the air inlet process of the turbocharged engine, enables the turbocharged engine to work in a natural air suction mode during low load, reduces the influence of pumping loss, and reduces the oil consumption rate of the turbocharged engine during low load operation.

Based on the same inventive concept, the embodiment of the application also provides a control device of the turbocharged engine. The turbocharged engine comprises a turbine provided with an exhaust gas control valve bypassing the turbine and a compressor combined with the turbine of the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; as shown in fig. 6, the apparatus includes:

a parameter acquisition module 601, configured to monitor a rotational speed and a circulating oil supply amount of the turbocharged engine;

the ventilation control module 602 is configured to control the exhaust control valve to open if it is determined that the turbocharged engine enters the first working condition, so that exhaust gas is exhausted through the exhaust control valve, and external air enters the cylinder through the intake check valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply amount is smaller than a preset second threshold value.

In one possible implementation, the ventilation control module 602 is specifically configured to:

if the turbocharged engine is judged to enter the first working condition, monitoring the duration of the first working condition when the turbocharged engine enters the first working condition;

if the current monitored rotating speed is smaller than the first threshold value, the current monitored circulating oil supply is smaller than the second threshold value, the previous monitored rotating speed is larger than or equal to the preset first threshold value, and the previous monitored circulating oil supply is larger than or equal to the second threshold value, the turbocharged engine is judged to enter the first working condition.

In one possible implementation, ventilation control module 602 is further configured to:

if the turbocharged engine is judged to enter a second working condition or a third working condition, the exhaust control valve is controlled to be closed, so that the exhaust gas is discharged through the turbine, and the external air enters the cylinder through the air compressor; the second working condition is a working condition that the rotating speed is smaller than the first threshold value and the circulating oil supply amount is larger than or equal to the second threshold value; the third working condition is a working condition meeting the condition that the rotating speed is larger than the first threshold value.

if the turbocharged engine is judged to enter the second working condition, monitoring the duration of the second working condition when the turbocharged engine enters the second working condition; if the turbocharged engine is judged to enter the third working condition, monitoring the duration of the third working condition when the turbocharged engine enters the third working condition;

Based on the same technical concept, the embodiment of the present application further provides an electronic device, and referring to fig. 7, the electronic device is configured to implement the methods described in the above embodiments of the methods, for example, implement the method shown in fig. 2, where the electronic device may include a memory 701, a processor 702, an input unit 703, and a display panel 704.

Memory 701 for storing a computer program for execution by processor 702. The memory 701 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the electronic device, etc. The processor 702 may be a central processing unit (central processing unit, CPU), or a digital processing unit, etc. An input unit 703 may be used to obtain user instructions entered by a user. The display panel 704 is configured to display information input by a user or information provided to the user, where in this embodiment of the present application, the display panel 704 is mainly configured to display interfaces of applications in a terminal device and control entities displayed in the display interfaces. Alternatively, the display panel 704 may be configured in the form of a liquid crystal display (liquid crystal display, LCD) or an OLED (organic light-emitting diode) or the like.

The specific connection medium between the memory 701, the processor 702, the input unit 703, and the display panel 704 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 701, the processor 702, the input unit 703 and the display panel 704 are connected by the bus 705 in fig. 7, the bus 705 is shown by a thick line in fig. 7, and the connection manner between other components is only schematically illustrated and not limited. The bus 705 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 7, but not only one bus or one type of bus.

The memory 701 may be a volatile memory (RAM), such as a random-access memory (RAM); the memory 701 may also be a non-volatile memory (non-volatile memory), such as a read-only memory, a flash memory (flash memory), a Hard Disk Drive (HDD) or a Solid State Drive (SSD), or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto. Memory 701 may be a combination of the above.

A processor 702 for invoking a computer program stored in memory 701 to perform the embodiment as shown in fig. 1.

Embodiments also provide a turbocharged engine comprising a turbine and a compressor coupled to a turbine of the turbine, the turbine being provided with an exhaust gas control valve that bypasses the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; the turbocharged engine further comprises:

the control unit is used for monitoring the rotating speed and the circulating oil supply quantity of the turbocharged engine; if the turbocharged engine is judged to enter a first working condition, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply amount is smaller than a preset second threshold value.

The embodiment of the application also provides a computer readable storage medium which stores computer executable instructions required to be executed by the processor, and the computer readable storage medium contains a program for executing the processor.

In some possible embodiments, aspects of a control method of a turbocharged engine provided herein may also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the steps of a control method of a turbocharged engine according to various exemplary embodiments of the present application described herein above, when the program product is run on the terminal device. For example, the electronic device may perform the embodiment shown in FIG. 2.

The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

A control program product for a turbocharged engine of embodiments of this application may employ a portable compact disc read-only memory (CD-ROM) and comprise program code, and may run on a computing device. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The readable signal medium may include a data signal propagated in baseband or as part of a carrier wave with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an entity oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).

It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such a division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the elements described above may be embodied in one element in accordance with embodiments of the present application. Conversely, the features and functions of one unit described above may be further divided into a plurality of units to be embodied.

Furthermore, although the operations of the methods of the present application are depicted in the drawings in a particular order, this is not required to or suggested that these operations must be performed in this particular order or that all of the illustrated operations must be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.

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 file processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable file 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 file 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 file 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.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A control method of a turbocharged engine comprising a turbine and a compressor in combination with a turbine of the turbine, characterized in that the turbine is provided with an exhaust gas control valve bypassing the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; the method comprises the following steps:

if the turbocharged engine is judged to enter a first working condition, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters a cylinder through the air inlet one-way valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value;

and if the turbocharged engine is judged to enter the first working condition, controlling the exhaust control valve to be opened, including:

2. The method of claim 1, wherein the determining that the turbocharged engine is entering the first operating condition comprises:

3. The method according to claim 1, wherein the method further comprises:

4. The method of claim 3, wherein controlling the exhaust control valve to close if the turbocharged engine is determined to enter the second or third operating condition comprises:

and if the duration of the second working condition or the duration of the third working condition is monitored to be longer than a preset fourth threshold value, controlling the exhaust control valve to be closed.

5. A control device of a turbocharged engine comprising a turbine and a compressor combined with a turbine of the turbine, characterized in that the turbine is provided with an exhaust gas control valve bypassing the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; the device comprises:

The ventilation control module is used for controlling the exhaust control valve to be opened if the turbocharged engine is judged to enter a first working condition, so that waste gas is discharged through the exhaust control valve, and external air enters the cylinder through the air inlet one-way valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value;

the ventilation control module is specifically configured to:

6. The device according to claim 5, wherein the ventilation control module is specifically configured to:

7. An electronic device comprising a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of the method of any of claims 1-4.

8. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, characterized in that: the computer program, when executed by a processor, implements the method of any of claims 1-4.

9. A turbocharged engine comprising a turbine and a compressor in combination with the turbine of the turbine, characterized in that the turbine is provided with an exhaust gas control valve bypassing the turbine; the air compressor is provided with an air inlet one-way valve which enables the air compressor to bypass in one way; the turbocharged engine further comprises:

a control unit for monitoring the rotational speed and the circulating oil supply of the turbocharged engine; if the turbocharged engine is judged to enter a first working condition, the exhaust control valve is controlled to be opened, so that waste gas is discharged through the exhaust control valve, and external air enters a cylinder through the air inlet one-way valve; the first working condition is a working condition that the rotating speed is smaller than a preset first threshold value and the circulating oil supply quantity is smaller than a preset second threshold value;

10. The turbocharged engine of claim 9, wherein the first flow cross-sectional area of the intake check valve is greater than the second flow cross-sectional area of the compressor.