A control method and related device of non-cooled EGR system

Abstract

The present application provides a control method and related device for a non-cooled EGR system, which relates to the field of software technology, and monitors the operating area of ​​the engine at the current moment; if the operating area is the first load area, when it is determined that the engine enters the sudden load drop stage, the EGR valve is controlled to reach the target opening, until the operating area switches from the first load area to the second load area, and the EGR valve is controlled from the target opening to the basic opening, wherein the load rate of the first load area is greater than or equal to the corresponding load rate threshold, and the load rate of the second load area is less than the load rate threshold. In the present application, the second load area is the operating area where the non-cooled EGR system is normally opened, and the load rate of the first load area is higher than that of the second load area, so that the EGR valve can be opened in advance at the beginning of the engine entering the sudden load drop stage, reducing the fresh air in the engine cylinder, thereby reducing transient NO x Peak, reduce NO x emission.

Description

Technical Field

[0001] The present application relates to the field of software technology, and in particular to a control method and related devices for a non-cooled EGR system. Background Art

[0002] As the demand for energy conservation and emission reduction continues to increase, the exhaust temperature of the engine is getting lower and lower. In order to meet the increasingly stringent emission requirements, many engines use non-cooled EGR systems for thermal management.

[0003] Since the non-cooled EGR system needs to be driven by the natural driving pressure difference, it is only turned on in the operating area with low load rate. When the engine enters the sudden load drop stage (such as when the driver suddenly releases the accelerator), the air circuit is slower than the oil circuit, resulting in excessive oxygen content in the engine cylinder, which will cause transient NO x The peak is large, which will cause difficulties in emission control. Summary of the invention

[0004] In view of the above problems, the present application provides a control method and related device for a non-cooled EGR system to reduce transient NO x The purpose of the peak. The specific plan is as follows:

[0005] A first aspect of the present application provides a control method for a non-cooled EGR system, the control method for the non-cooled EGR system comprising:

[0006] Monitor the engine's operating area at the current moment;

[0007] If the operating region is the first load region, when it is determined that the engine enters the sudden load drop stage, the EGR valve is controlled to reach the target opening, until the operating region switches from the first load region to the second load region, and the EGR valve is controlled from the target opening to the basic opening, wherein the load rate of the first load region is greater than or equal to the corresponding load rate threshold, and the load rate of the second load region is less than the load rate threshold.

[0008] In a possible implementation, monitoring the operating area of ​​the engine at the current moment includes:

[0009] Obtaining a first speed and a first cycle fuel injection amount of the engine at a current moment;

[0010] Retrieving a basic opening table of the EGR valve, and querying the basic opening table according to the first speed and the first cycle injection amount;

[0011] If the query result is 0, determining that the operating area is the first load area;

[0012] If the query result is greater than 0, it is determined that the operating area is the second load area.

[0013] In a possible implementation, determining that the engine enters a sudden load reduction stage includes:

[0014] Obtaining a first intake air flow rate and a second cycle fuel injection amount of the engine at the current moment;

[0015] Retrieving the second intake flow rate and the third cycle fuel injection amount of the engine at the previous moment;

[0016] Calculating an intake air flow rate change rate according to the first intake air flow rate and the second intake air flow rate, and calculating a cycle fuel injection amount change rate according to the second cycle fuel injection amount and the third cycle fuel injection amount;

[0017] If the intake air flow rate change rate is greater than the corresponding first change rate threshold, and the cycle injection amount change rate is greater than the corresponding second change rate threshold, it is determined that the engine enters the sudden load reduction stage.

[0018] In a possible implementation, controlling the EGR valve to reach a target opening degree includes:

[0019] Obtaining the delay duration corresponding to the engine;

[0020] If the operating region is the first load region during the delay period, the EGR valve is controlled to reach the target opening degree.

[0021] In a possible implementation, controlling the EGR valve to reach a target opening degree includes:

[0022] Obtaining a second speed of the engine at a current moment;

[0023] The target opening is determined according to the second speed, and the EGR valve is controlled to open according to the target opening.

[0024] A second aspect of the present application provides a control device for a non-cooled EGR system, the control device for the non-cooled EGR system comprising:

[0025] A monitoring module, used to monitor the operating area of ​​the engine at the current moment;

[0026] A control module, for controlling the EGR valve to reach a target opening when it is determined that the engine enters a sudden load drop phase if the operating region is a first load region, until the operating region switches from the first load region to a second load region, controlling the EGR valve to reach a basic opening from the target opening, wherein the load rate of the first load region is greater than or equal to a corresponding load rate threshold, and the load rate of the second load region is less than the load rate threshold.

[0027] In a possible implementation, the monitoring module is specifically used to:

[0028] Obtain the first speed and the first cycle fuel injection amount of the engine at the current moment; retrieve the basic opening table of the EGR valve, and query the basic opening table according to the first speed and the first cycle fuel injection amount; if the query result is 0, determine that the operating area is the first load area; if the query result is greater than 0, determine that the operating area is the second load area.

[0029] A third aspect of the present application provides a computer program product, including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements the control method of a non-cooled EGR system according to the first aspect or any implementation of the first aspect.

[0030] A fourth aspect of the present application provides an electronic device, comprising at least one processor and a memory connected to the processor, wherein:

[0031] The memory is used to store computer programs;

[0032] The processor is used to execute the computer program so that the electronic device can implement the control method of the non-cooled EGR system of the first aspect or any implementation method of the first aspect.

[0033] The fifth aspect of the present application provides a computer storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the control method of the non-cooled EGR system of the above-mentioned first aspect or any implementation method of the first aspect.

[0034] By means of the above technical solution, the present application provides a control method and related devices for a non-cooled EGR system, which monitor the operating area of ​​the engine at the current moment; if the operating area is the first load area, when it is determined that the engine enters the sudden load drop stage, the EGR valve is controlled to reach the target opening, until the operating area switches from the first load area to the second load area, the EGR valve is controlled from the target opening to the basic opening, wherein the load rate of the first load area is greater than or equal to the corresponding load rate threshold, and the load rate of the second load area is less than the load rate threshold. In the present application, the second load area is the operating area where the non-cooled EGR system is normally opened, and the load rate of the first load area is higher than that of the second load area, so that the EGR valve can be opened in advance at the beginning of the engine entering the sudden load drop stage, thereby reducing the fresh air in the engine cylinder, thereby reducing transient NO x Peak, reduce NO x emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0036] Figure 1 It is a structural schematic diagram of a non-cooled EGR system;

[0037] Figure 2 A flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application;

[0038] Figure 3 A partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application;

[0039] Figure 4 Another partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application;

[0040] Figure 5 Another partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application;

[0041] Figure 6 Another partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of the structure of a control device for a non-cooled EGR system provided in an embodiment of the present application;

[0043] Figure 8A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0045] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0046] The terms "first", "second" etc. in the specification of the application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable in appropriate circumstances, and this is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0047] To facilitate understanding of this application, the following first describes the relevant concepts involved in this application:

[0048] EGR (Exhaust Gas Recirculation): It is to guide part of the engine's exhaust gas back into the cylinder and mix it with the engine's fresh intake air to improve engine efficiency, improve the combustion environment, reduce engine load, and reduce NO x (Nitrogen oxide) emissions, knock reduction, and extended service life of various components.

[0049] Calibration: The data from engine design and development is filled into the engine controller (ECU, Electronic Control Unit) as the data used during the operation of the engine controller.

[0050] In order to meet the stringent emission regulations, the engine adopts post-treatment to control emissions. The SCR (Selective Catalytic Reduction) carrier in the post-treatment mainly reacts with NO generated by the engine by injecting urea. xThe catalytic reduction reaction is carried out. This reaction has a high conversion efficiency only at an appropriate temperature. The conversion efficiency is also low when the temperature is too low. Therefore, when the engine is in the cold start or exhaust temperature reduction stage, the non-cooled EGR system is often turned on to increase the exhaust temperature.

[0051] See also Figure 1 , Figure 1 It is a structural diagram of the non-cooled EGR system. Figure 1 As shown, the non-cooled EGR system includes an air filter A, a compressor B, an intercooler C, a throttle valve D, an engine body E, a turbine F, a post-treatment G, and an EGR valve H. When the non-cooled EGR system is turned on, a part of the high-temperature exhaust gas generated by the engine body E is discharged into the atmosphere through the turbine F and the post-treatment G, and the other part enters the intake pipe through the EGR valve H. The high-temperature exhaust gas entering the intake pipe is mixed with the fresh air entering through the air filter A, the compressor B, the intercooler C and the throttle valve D, and then enters the engine body E, thereby reducing the intake amount of fresh air and increasing the exhaust temperature. At the same time, the high-temperature exhaust gas entering through the EGR valve H can also reduce the oxygen content in the cylinder of the engine body E, thereby reducing NO x Generation of.

[0052] At present, the non-cooled EGR system needs to be driven by the natural driving pressure difference, which is the pre-turbine pressure ( Figure 1 The pressure at point P1 in the middle) and the intake pipe pressure ( Figure 1 The driving pressure difference is the pressure at point P2 in the middle. Only when the driving pressure difference is greater than 0, the EGR valve H will open, and the high-temperature exhaust gas can enter the intake pipe through the EGR valve H to achieve exhaust gas recirculation. The driving pressure difference is affected by the intake and exhaust system, and there is a driving pressure difference only in the low-load area (that is, the operating area where the engine load rate is lower than the load rate threshold). When the engine enters the sudden load drop stage (for example, when the driver suddenly releases the accelerator), the air circuit is slower than the oil circuit in response, resulting in excessive oxygen content in the engine cylinder, which will cause transient NO x The peak is large, which will cause difficulties in emission control.

[0053] In order to solve the above problems, the present invention provides a control method for a non-cooled EGR system to reduce transient NO x The purpose of the peak value. The control method of the non-cooled EGR system of the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0054] See also Figure 2 , Figure 2 A flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application. Figure 2As shown, a control method for a non-cooled EGR system provided in an embodiment of the present application is applied to an engine controller and may include steps S10 to S20, which are described in detail below.

[0055] S10, monitoring the operating area of ​​the engine at the current moment.

[0056] In the embodiment of the present application, the operating area of ​​the engine can be determined by monitoring the operating parameters of the engine at the current moment, and the operating area can be divided into a first load area that characterizes the pre-opening of the EGR valve (i.e., the operating area in which the non-cooled EGR system is opened in advance), and a second load area that characterizes the normal opening of the EGR valve (i.e., the operating area in which the non-cooled EGR system is opened normally).

[0057] Specifically, the load rate of the engine at the current moment can be determined by monitoring the engine speed and torque (or cyclic injection amount). If the load rate is greater than or equal to the corresponding load rate threshold, the operating area of ​​the engine at the current moment can be determined to be the first load area; if the load rate is less than the corresponding load rate threshold, the operating area of ​​the engine at the current moment can be determined to be the second load area.

[0058] Taking monitoring the engine speed and torque as an example, assuming that the engine speed at the current moment is monitored to be w1 and the torque is T1, the maximum torque of the engine at the speed w1 can be queried as T2. The load rate of the engine at the current moment can be obtained by calculating the ratio of T1 / T2, and then compared with the load rate threshold to determine whether the engine's operating area at the current moment is the first load area or the second load area.

[0059] It should be noted that in actual applications, there is a one-to-one correspondence between torque and cyclic injection amount, so both torque and cyclic injection amount represent the work output of the engine. In this regard, in some scenarios, the engine load rate can also be determined by monitoring the engine speed and cyclic injection amount, which is not limited in the embodiments of the present application.

[0060] In a possible implementation, when the non-cooled EGR system is normally opened, a basic opening table of the EGR valve is calibrated, and the basic opening table of the EGR valve records the opening values ​​of the EGR valve at different speeds and different cycle injection amounts. The opening value is greater than 0 only when the engine is in the second load area. Figure 3 , Figure 3 A partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application. Figure 3As shown, an embodiment of the present application provides a control method for a non-cooled EGR system, wherein step S10 "monitoring the operating area of ​​the engine at the current moment" may include steps S101 to S104, and these steps are described in detail below.

[0061] S101, obtaining a first speed and a first cycle fuel injection amount of the engine at a current moment.

[0062] Specifically, in the embodiment of the present application, the engine speed (ie, the first speed) and the cycle fuel injection amount (ie, the first cycle fuel injection amount) at the current moment can be monitored.

[0063] S102, retrieve a basic opening table of the EGR valve, and query the basic opening table according to the first speed and the first cycle fuel injection amount.

[0064] Specifically, in the embodiment of the present application, the basic opening table of the EGR valve is retrieved, and then the basic opening table is queried using the first speed and the first cycle fuel injection amount to obtain the opening value corresponding to the first speed and the first cycle fuel injection amount in the basic opening table.

[0065] S103: If the query result is 0, determine that the operating area is the first load area.

[0066] Specifically, in the embodiment of the present application, if the query result (ie, the opening value obtained by the query) is 0, it means that the engine is currently operating in the first load region where the load rate is greater than or equal to the load rate threshold.

[0067] S104: If the query result is greater than 0, determine that the operating area is the second load area.

[0068] Specifically, in the embodiment of the present application, if the query result (ie, the opening value obtained by the query) is greater than 0, it means that the engine is currently operating in the second load region where the load rate is less than the load rate threshold.

[0069] S20, if the operating area is the first load area, when it is determined that the engine enters the sudden load drop stage, the EGR valve is controlled to reach the target opening, until the operating area switches from the first load area to the second load area, the EGR valve is controlled from the target opening to the basic opening, wherein the load rate of the first load area is greater than or equal to the corresponding load rate threshold, and the load rate of the second load area is less than the load rate threshold.

[0070] In an embodiment of the present application, if the operating area of ​​the engine at the current moment is the first load area, it is determined whether the engine has entered the sudden load reduction stage. Specifically, it can be determined by the rate of change of the load rate of the engine at the current moment. If the rate of change of the load rate is greater than the corresponding rate of change threshold, it can be determined that the engine has entered the sudden load reduction stage.

[0071] Furthermore, the initial stage of the engine entering the sudden load drop stage is determined, and the EGR valve is controlled to reach the preset target opening, so that the EGR valve is opened in advance, which will reduce the amount of exhaust gas entering the turbine, reduce the supply of the supercharger, and thus reduce the work of the compressor. In this way, the intake amount of fresh air will also be reduced, thereby increasing the exhaust temperature. At the same time, it can also reduce the oxygen content in the cylinder and reduce NO x Generation of.

[0072] Furthermore, after the EGR valve is controlled to reach the target opening, the EGR valve is kept at the target opening, and the operating area of ​​the engine at the current moment is continuously monitored until the operating area switches from the first load area to the second load area, and the EGR valve is controlled to reach the basic opening from the target opening. Specifically, the basic opening is obtained by querying the basic opening table of the EGR valve. Assuming that the engine speed at the current moment is monitored to be w2 and the circulating fuel injection amount is Q1, the basic opening table is queried using the speed w2 and the circulating fuel injection amount Q1 to obtain the opening value corresponding to the speed w2 and the circulating fuel injection amount Q1 in the basic opening table, and the opening value obtained by the query is used as the basic opening to control the start of the EGR valve.

[0073] In a possible implementation, it is possible to determine whether the engine has entered the sudden load reduction stage by using the intake air flow and the cycle injection amount. Figure 4 , Figure 4 Another partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application. Figure 4 As shown, an embodiment of the present application provides a control method for a non-cooled EGR system, wherein "determining that the engine enters a sudden load reduction stage" in step S20 may include steps S201 to S204, and these steps are described in detail below.

[0074] S201, obtaining the first intake air flow and the second cycle fuel injection amount of the engine at the current moment.

[0075] Specifically, in the embodiment of the present application, the intake flow rate (ie, the first intake flow rate) and the cycle injection amount (ie, the second cycle injection amount) of the engine at the current moment can be monitored and records can be obtained.

[0076] S202, retrieve the second intake air flow and the third cycle fuel injection amount of the engine at the previous moment.

[0077] Specifically, in the embodiment of the present application, the intake flow rate (ie, the second intake flow rate) and the cycle fuel injection amount (ie, the third cycle fuel injection amount) of the engine at the previous moment can be retrieved.

[0078] S203, calculating the change rate of the intake air flow rate according to the first intake air flow rate and the second intake air flow rate, and calculating the change rate of the cycle injection amount according to the second cycle injection amount and the third cycle injection amount.

[0079] Specifically, in the embodiment of the present application, the time difference between the current moment and the previous moment, the flow difference between the first intake flow and the second intake flow, and the injection amount difference between the second cycle injection amount and the third cycle injection amount can be calculated, and then, the ratio of the flow difference to the time difference is used as the intake flow change rate, and the ratio of the injection amount difference to the time difference is used as the cycle injection amount change rate.

[0080] S204: If the intake air flow rate change rate is greater than the corresponding first change rate threshold, and the cycle injection amount change rate is greater than the corresponding second change rate threshold, it is determined that the engine enters a sudden load reduction stage.

[0081] Specifically, in the embodiment of the present application, a corresponding change rate threshold (i.e., a first change rate threshold) may be set for the intake flow rate, and a corresponding change rate threshold (i.e., a second change rate threshold) may be set for the cyclic injection amount. If the intake flow rate change rate is greater than the first change rate threshold, and the cyclic injection amount change rate is greater than the second change rate threshold, it may be determined that the engine has entered the sudden load drop stage.

[0082] In a possible implementation, in order to avoid a sudden drop in engine load due to an erroneous triggering by the driver, and to reduce the engine load rate to a range close to the load rate threshold, in the embodiment of the present application, a delay control may be performed after determining that the engine has entered a sudden drop in load stage. Figure 5 , Figure 5 Another partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application. Figure 5 As shown, an embodiment of the present application provides a control method for a non-cooled EGR system, wherein "controlling the EGR valve to reach a target opening" in step S20 may include steps S205 to S206, and these steps are described in detail below.

[0083] S205, obtaining the delay duration corresponding to the engine.

[0084] In the embodiment of the present application, the corresponding delay duration of the engine can be obtained. For example, if the engine load rate threshold is 25%, the delay duration is taken from the range of 1S to 2S, which can reduce the engine load rate to the range of 25% to 50%.

[0085] S206: If the operating region is the first load region during the delay time, the EGR valve is controlled to reach a target opening.

[0086] In the embodiment of the present application, the EGR valve can be started after a delay period. During this process, the operating area of ​​the engine can be monitored in real time. If the operating area is the first load area within the delay period, the EGR valve is controlled to open to the target opening.

[0087] In a possible implementation, the target opening degree of the EGR valve early opening can be determined by the engine speed. Figure 6 , Figure 6 Another partial flow chart of a control method for a non-cooled EGR system provided in an embodiment of the present application. Figure 6 As shown, an embodiment of the present application provides a control method for a non-cooled EGR system, wherein "controlling the EGR valve to reach a target opening" in step S20 may include steps S207 to S208, and these steps are described in detail below.

[0088] S207, obtaining a second rotation speed of the engine at the current moment.

[0089] Specifically, in the embodiment of the present application, the speed of the engine at the current moment (ie, the second speed) can be monitored.

[0090] S208, determining a target opening according to the second speed, and controlling the EGR valve to open according to the target opening.

[0091] Specifically, in the embodiment of the present application, the pre-opening opening table of the EGR valve can be calibrated, and the pre-opening opening table records the opening values ​​corresponding to different speeds. Based on this, the opening value corresponding to the second speed can be queried in the pre-opening opening table, and the queried opening value is used as the target opening to control the opening of the EGR valve so that the EGR valve reaches the target opening.

[0092] Through the above description, the control method of a non-cooled EGR system provided by the embodiment of the present application can open the EGR valve in advance at the beginning of the engine entering the sudden load drop stage, reduce the fresh air in the engine cylinder, and thus reduce transient NO x Peak, reduce NO x emission.

[0093] A control method for a non-cooled EGR system provided in an embodiment of the present application is introduced above. A device for executing the control method for a non-cooled EGR system will be introduced below.

[0094] See also Figure 7 , Figure 7 A schematic diagram of the structure of a control device for a non-cooled EGR system provided in an embodiment of the present application. Figure 7 As shown, a control device for a non-cooled EGR system provided in an embodiment of the present application includes:

[0095] The monitoring module 10 is used to monitor the operating area of ​​the engine at the current moment;

[0096] The control module 20 is used to control the EGR valve to reach the target opening when it is determined that the engine enters the sudden load drop stage if the operating area is the first load area, until the operating area switches from the first load area to the second load area, and control the EGR valve from the target opening to the basic opening, wherein the load rate of the first load area is greater than or equal to the corresponding load rate threshold, and the load rate of the second load area is less than the load rate threshold.

[0097] In a possible implementation, the monitoring module 10 is specifically configured to:

[0098] Obtain the first speed and the first cycle fuel injection amount of the engine at the current moment; retrieve the basic opening table of the EGR valve, and query the basic opening table according to the first speed and the first cycle fuel injection amount; if the query result is 0, determine that the operating area is the first load area; if the query result is greater than 0, determine that the operating area is the second load area.

[0099] In a possible implementation, the control module 20 for determining whether the engine enters the sudden load reduction stage is specifically configured to:

[0100] Obtain the first intake flow rate and the second cycle fuel injection amount of the engine at the current moment; retrieve the second intake flow rate and the third cycle fuel injection amount of the engine at the previous moment; calculate the intake flow rate change rate according to the first intake flow rate and the second intake flow rate, and calculate the cycle fuel injection amount change rate according to the second cycle fuel injection amount and the third cycle fuel injection amount; if the intake flow rate change rate is greater than the corresponding first change rate threshold, and the cycle fuel injection amount change rate is greater than the corresponding second change rate threshold, determine that the engine enters a sudden load reduction stage.

[0101] In a possible implementation, the control module 20 for controlling the EGR valve to reach a target opening is specifically configured to:

[0102] Obtain the delay time corresponding to the engine; if the operating area is the first load area within the delay time, control the EGR valve to reach the target opening.

[0103] In a possible implementation, the control module 20 for controlling the EGR valve to reach a target opening is specifically configured to:

[0104] The second speed of the engine at the current moment is obtained; a target opening is determined according to the second speed, and the EGR valve is controlled to open according to the target opening.

[0105] It should be noted that the detailed functions of each module in the embodiment of the present application can be found in the corresponding disclosed part of the control method embodiment of the non-cooled EGR system mentioned above, and will not be repeated here.

[0106] The present application also provides an electronic device in an embodiment. Figure 8 , Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device in the embodiment of the present application may include but is not limited to fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 8 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0107] like Figure 8 As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 801, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 802 or a program loaded from a storage device 808 to a random access memory (RAM) 803. When the electronic device is powered on, various programs and data required for the operation of the electronic device are also stored in the RAM 803. The processing device 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0108] Typically, the following devices may be connected to the I / O interface 805: input devices 806 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 807 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 808 including, for example, a memory card, a hard disk, etc.; and communication devices 809. The communication device 809 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 8 An electronic device having various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0109] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any control method for a non-cooled EGR system provided in the embodiment of the present application.

[0110] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any control method of the non-cooled EGR system provided in the embodiment of the present application.

[0111] It should also be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines.

[0112] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0113] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0114] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a training device, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device, or data center. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

Claims

1. A control method for a non-cooled EGR system, characterized in that: The control method of the non-cooled EGR system includes: Monitor the engine's operating area at the current moment; If the operating region is the first load region, when it is determined that the engine enters the sudden load drop stage, the EGR valve is controlled to reach the target opening, until the operating region switches from the first load region to the second load region, and the EGR valve is controlled from the target opening to the basic opening, wherein the load rate of the first load region is greater than or equal to the corresponding load rate threshold, and the load rate of the second load region is less than the load rate threshold.

2. The control method of the non-cooled EGR system according to claim 1, characterized in that: The monitoring engine's operating area at the current moment includes: Obtaining a first speed and a first cycle fuel injection amount of the engine at a current moment; Retrieving a basic opening table of the EGR valve, and querying the basic opening table according to the first speed and the first cycle injection amount; If the query result is 0, determining that the operating area is the first load area; If the query result is greater than 0, it is determined that the operating area is the second load area.

3. The control method of the non-cooled EGR system according to claim 1, characterized in that: The step of determining that the engine enters a sudden load reduction stage comprises: Obtaining a first intake air flow rate and a second cycle fuel injection amount of the engine at the current moment; Retrieving the second intake flow rate and the third cycle fuel injection amount of the engine at the previous moment; Calculating an intake air flow rate change rate according to the first intake air flow rate and the second intake air flow rate, and calculating a cycle fuel injection amount change rate according to the second cycle fuel injection amount and the third cycle fuel injection amount; If the intake air flow rate change rate is greater than the corresponding first change rate threshold, and the cycle injection amount change rate is greater than the corresponding second change rate threshold, it is determined that the engine enters the sudden load reduction stage.

4. The control method of the non-cooled EGR system according to claim 1, characterized in that: The controlling the EGR valve to reach a target opening degree comprises: Obtaining the delay duration corresponding to the engine; If the operating region is the first load region during the delay period, the EGR valve is controlled to reach the target opening degree.

5. The control method of the non-cooled EGR system according to claim 1, characterized in that: The controlling the EGR valve to reach a target opening degree comprises: Obtaining a second speed of the engine at a current moment; The target opening is determined according to the second speed, and the EGR valve is controlled to open according to the target opening.

6. A control device for a non-cooled EGR system, characterized in that: The control device of the non-cooled EGR system includes: A monitoring module, used to monitor the operating area of ​​the engine at the current moment; A control module, for controlling the EGR valve to reach a target opening when it is determined that the engine enters a sudden load drop phase if the operating region is a first load region, until the operating region switches from the first load region to a second load region, controlling the EGR valve to reach a basic opening from the target opening, wherein the load rate of the first load region is greater than or equal to a corresponding load rate threshold, and the load rate of the second load region is less than the load rate threshold.

7. The control device of the non-cooled EGR system according to claim 6, characterized in that: The monitoring module is specifically used for: Obtaining a first speed and a first cycle fuel injection amount of the engine at the current moment; retrieving a basic opening table of the EGR valve, and querying the basic opening table according to the first speed and the first cycle fuel injection amount; If the query result is 0, determining that the operating area is the first load area; If the query result is greater than 0, it is determined that the operating area is the second load area.

8. A computer program product, characterized in that The method comprises computer-readable instructions, and when the computer-readable instructions are executed on an electronic device, the electronic device implements the control method of the non-cooled EGR system according to any one of claims 1 to 5.

9. An electronic device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the control method of the non-cooled EGR system according to any one of claims 1 to 5.

10. A computer storage medium, characterized in that: The storage medium carries one or more computer programs, which, when executed by an electronic device, enable the electronic device to implement the control method of the non-cooled EGR system as described in any one of claims 1 to 5.

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