Exhaust gas recirculation control method and device, electronic equipment and vehicle

Abstract

The invention discloses an exhaust gas recirculation control method and device, electronic equipment and a vehicle, relates to the field of engines, and can stop a fault diagnosis process of an exhaust gas recirculation system when determining that the exhaust gas recirculation system is in an icing state, so as to avoid the false alarm condition of the exhaust gas recirculation system and improve the reliability of the exhaust gas recirculation system. And the failure rate of the exhaust gas recirculation system is effectively reduced. And meanwhile, when it is determined that the engine is in the knocking working condition according to the operation parameters of the engine, the ignition angle of the engine is adjusted to be the back ignition angle corresponding to the knocking working condition, the back ignition angle is adjusted according to the knocking parameter value representing the knocking degree of the engine, the engine knocking situation can be effectively avoided, and the engine is protected. And when the knock parameter value exceeds the limiting threshold value, the power provided by the engine is limited, the engine is further protected, and the risk of damage to the engine can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of engines, and particularly to an exhaust gas recirculation control method, device, electronic device, and vehicle. Background Art

[0002] EGR (Exhaust Gas Recirculation) is a technology that reduces nitrogen oxide emissions and improves fuel efficiency by reintroducing a portion of the exhaust gas back into the engine combustion chamber and mixing it with fresh air for combustion. The exhaust gas recirculation system generally consists of an EGR valve, a cooler, pipelines, sensors, etc. In a cold environment, the water vapor in the exhaust gas will condense into ice when the temperature drops, causing the pipelines of the exhaust gas recirculation system to freeze. Currently, it takes a long time for the engine to start from a cold state until the ice in the exhaust gas recirculation system disappears. During this period, the risk of engine damage due to the freezing of the exhaust gas recirculation system will increase significantly. How to effectively reduce this risk and ensure the normal operation of the engine has become an urgent problem to be solved. Summary of the Invention

[0003] In view of the above problems, the present application provides an exhaust gas recirculation control method, device, electronic device, and vehicle to achieve the purpose of reducing the risk of engine damage. The specific solutions are as follows:

[0004] The first aspect of the present application provides an exhaust gas recirculation control method, including:

[0005] Determine whether the exhaust gas recirculation system is in a frozen state;

[0006] When the exhaust gas recirculation system is in the frozen state, stop the fault diagnosis process of the exhaust gas recirculation system, and determine whether the engine is in a knocking condition according to the operating parameters of the engine;

[0007] When it is determined that the engine is in the knocking condition, adjust the ignition angle of the engine to the retarding ignition angle corresponding to the knocking condition, and adjust the retarding ignition angle according to the knocking parameter value representing the knocking degree of the engine;

[0008] When the knocking parameter value exceeds the limit threshold, limit the power provided by the engine.

[0009] In a possible implementation, the knocking parameter value includes: the knocking value detected by a knocking sensor, and the adjusting the retarding ignition angle according to the knocking parameter value representing the knocking degree of the engine includes:

[0010] If the knocking value is less than the first threshold, reduce the retarding ignition angle;

[0011] If the knock value is greater than the first threshold and less than the second threshold, the ignition retard angle remains unchanged;

[0012] If the knock value is greater than the second threshold and not greater than the limit threshold, increase the ignition retard angle.

[0013] In a possible implementation, determining whether the exhaust gas recirculation system is in an icing state includes:

[0014] If the ambient temperature is lower than the first temperature value, the temperature of the EGR valve is lower than the second temperature value, and there is a stuck opening when driving the EGR valve to act, it is determined that it is in the icing state.

[0015] In a possible implementation, determining whether the exhaust gas recirculation system is in an icing state further includes:

[0016] If the ambient temperature is within the first temperature range, the temperature of the EGR valve is lower than the second temperature value, the temperature of the engine coolant is lower than the third temperature value, and there is the stuck opening when driving the EGR valve to act, it is determined that it is in the icing state, and the minimum value of the first temperature range is the first temperature value.

[0017] In a possible implementation, determining whether the exhaust gas recirculation system is in an icing state further includes:

[0018] If the temperature of the EGR valve is not lower than the second temperature value, or the temperature of the coolant is not lower than the third temperature value, or the ambient temperature is not lower than the maximum value of the first temperature range, it is determined that it is not in the icing state.

[0019] In a possible implementation, determining whether the engine is in a knocking condition according to the operating parameters of the engine includes:

[0020] If the parameter value of the operating parameter exceeds the limit value corresponding to the knocking condition, it is determined that the engine is in the knocking condition, and the operating parameters include one or more of speed, charge, torque, and load rate.

[0021] In a possible implementation, the determination process of the ignition retard angle corresponding to the knocking condition includes:

[0022] Determine the ignition retard angle from the calibration table according to the knock value detected by the knock sensor and the current opening of the EGR valve.

[0023] A second aspect of the present application provides an exhaust gas recirculation control device, including:

[0024] An icing state determination module for determining whether the exhaust gas recirculation system is in an icing state;

[0025] A knock condition determination module, configured to stop the fault diagnosis process of the exhaust gas recirculation system when the icing state determination module determines that the exhaust gas recirculation system is in the icing state, and determine whether the engine is in a knock condition according to the operating parameters of the engine;

[0026] A retarding ignition angle control module, configured to adjust the ignition angle of the engine to the retarding ignition angle corresponding to the knock condition when the knock condition determination module determines that the engine is in the knock condition, and adjust the retarding ignition angle according to the knock parameter value characterizing the knock degree of the engine; and,

[0027] An engine torque limiting module, configured to limit the power provided by the engine when the knock parameter value exceeds a limit threshold.

[0028] A third aspect of the present application provides an electronic device, including at least one processor and a memory connected to the processor, wherein:

[0029] The memory is used to store a computer program;

[0030] The processor is configured to execute the computer program so that the electronic device can implement the exhaust gas recirculation control method according to the first aspect or any implementation manner of the first aspect.

[0031] A fourth aspect of the present application provides a vehicle, including: the electronic device according to the third aspect described above.

[0032] A fifth aspect of the present application provides a computer program product, including computer-readable instructions, which, when running on an electronic device, enable the electronic device to implement the exhaust gas recirculation control method according to the first aspect or any implementation manner of the first aspect.

[0033] A sixth aspect of the present application provides a computer storage medium, which carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, can enable the electronic device to implement the exhaust gas recirculation control method according to the first aspect or any implementation manner of the first aspect.

[0034] With the above technical solution, the exhaust gas recirculation control method provided by this application can stop the fault diagnosis process of the exhaust gas recirculation system when it is determined that the exhaust gas recirculation system is in an icing state, avoid false alarms of the exhaust gas recirculation system, and effectively reduce the failure rate of the exhaust gas recirculation system. At the same time, when it is determined that the engine is in a knocking condition according to the operating parameters of the engine, the ignition angle of the engine is adjusted to the ignition retard angle corresponding to the knocking condition, and the ignition retard angle is adjusted according to the knocking parameter value representing the knocking degree of the engine, which can effectively prevent the occurrence of engine knocking and protect the engine.

[0035] When the knocking parameter value exceeds the limit threshold, the power provided to the engine is restricted to further protect the engine, which can effectively reduce the risk of engine damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic and the original components and elements are not necessarily drawn to scale.

[0037] Figure 1 It is a flowchart of an exhaust gas recirculation control method provided by this application;

[0038] Figure 2 It is a process diagram of an exhaust gas recirculation control method provided by this application;

[0039] Figure 3 It is a judgment process diagram of the icing state provided by this application;

[0040] Figure 4 It is a structural diagram of an exhaust gas recirculation control device provided by this application;

[0041] Figure 5 It is a structural diagram of an electronic device provided by this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] 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 embodiments of the present application are only for explaining the specific embodiments of the present application and are not intended to limit the present application.

[0043] The following describes the embodiments of the present application in conjunction with the drawings. Those skilled in the art will know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0044] In the description and claims of this application and the above-mentioned drawings, terms such as "first" and "second" are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is merely a way of distinguishing objects with the same attributes when describing embodiments of this application. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products or devices.

[0045] After the engine has not been running for a long time, the temperature of the engine and its related systems will be close to the ambient temperature at this time, which is called the cold engine state. When the exhaust gas recirculation system freezes, when the engine starts from the cold engine state, ice-breaking operation needs to be carried out on the exhaust gas recirculation system. Currently, the commonly used solutions include:

[0046] Water jacket heating: After the engine starts, the heat of the engine coolant is used to heat the exhaust gas recirculation system to achieve ice melting.

[0047] Electric heating: After the engine starts, the electric energy of the generator is used to heat the exhaust gas recirculation system to achieve ice melting.

[0048] Pipeline design of water collecting tank, wrapping and drainage device: By reasonable wrapping, pipeline design and drainage device, the water in the exhaust gas recirculation system is reduced, and the icing risk is reduced.

[0049] EGR valve active ice breaking: After the controller judges that the EGR valve is stuck or frozen, the EGR valve is driven to act repeatedly with a larger duty cycle, and an attempt is made to achieve ice breaking with hardware actions.

[0050] Although these solutions can eliminate the icing of the exhaust gas recirculation system, they all take a long time. For example, for water jacket heating, due to the low initial water temperature at low temperature, it takes a long time to heat up. For electric heating: restricted by the operating power of the engine, the time taken for the first ice melting is long. For pipeline design of water collecting tank, wrapping and drainage device: its ice melting effect is restricted by the pipeline layout and direction, and is greatly affected by the environment. It freezes quickly in alpine regions and will take a long time to heat. EGR valve active ice breaking: not only causes certain damage to the hardware of the EGR valve, but also takes a long time to break the ice, and it is impossible to break the ice when there is a lot of ice.

[0051] In summary, when the above solutions solve the icing problem of the exhaust gas recirculation system when the engine starts from the cold engine state, they all take a long time, and during this period, the risk of engine damage and false error reporting caused by the icing of the exhaust gas recirculation system will be greatly increased.

[0052] To solve the above problems, an embodiment of the present application provides an exhaust gas recirculation control method. The exhaust gas recirculation control method of the embodiment of the present application will be introduced in detail below with reference to the accompanying drawings.

[0053] Refer to Figure 1 , Figure 1 which is a flowchart showing an exhaust gas recirculation control method provided by an embodiment of the present application. As Figure 1 shown, an exhaust gas recirculation control method provided by an embodiment of the present application may include steps 101 to 104, and these steps will be described in detail below respectively.

[0054] 101. Determine whether the exhaust gas recirculation system is in a frozen state.

[0055] In one embodiment, considering that the EGR valve plays a relatively important role in the exhaust gas recirculation system and is also a device that is severely affected by icing in the exhaust gas recirculation system. Therefore, when the engine is started from a cold state, to determine whether the exhaust gas recirculation system is in a frozen state (i.e., whether it has frozen), it can be judged based on the ambient temperature and the temperature of the EGR valve. When detecting the temperature of the EGR valve, the real-time temperature can be measured through a temperature sensor provided on the EGR valve. When the ambient temperature is relatively low, since the engine has been in a low-temperature environment for a long time before starting, the temperature of the EGR valve detected when the engine starts is almost the same as the ambient temperature. If the outdoor temperature is very low (for example, around -20°C), the temperature is very low at this time and there is a high risk of icing. To further determine whether the EGR valve is in a frozen state, the opening of the EGR valve can be adjusted, and based on the adjustment result, it can be further determined whether the EGR valve is frozen.

[0056] It can be understood that those skilled in the art can also use other temperature detection methods or positions to judge whether the exhaust gas recirculation system is in a frozen state, which will not be elaborated here.

[0057] 102. When the exhaust gas recirculation system is in a frozen state, stop the fault diagnosis process of the exhaust gas recirculation system, and determine whether the engine is in a knocking condition according to the operating parameters of the engine.

[0058] In specific implementation, when it is determined that the exhaust gas recirculation system is in a frozen state, it only means that the EGR valve is in a temporarily unavailable state due to icing at this time, rather than being unavailable due to damage to the EGR valve. Therefore, to reduce system false alarms and reduce the failure rate. The protection strategy for the exhaust gas recirculation system can be executed, that is, stop the execution of the fault diagnosis process of the exhaust gas recirculation system, and no longer diagnose and alarm for faults such as EGR valve sticking and abnormal EGR flow.

[0059] Meanwhile, to effectively reduce engine knocking when the EGR valve freezes and timely adjust the engine operating conditions to effectively reduce the occurrence of engine damage, the knocking condition of the engine can be judged in combination with the engine operating parameters. For example, if the parameter value of the operating parameter exceeds the limit value corresponding to the knocking condition, it is determined that the engine is in the knocking condition. The operating parameters may include one or more of the following: speed, charge, torque, and load rate. The charge refers to the actual amount of air entering the cylinder during the intake process of the engine. When the amount of air entering the engine is large and the octane number is insufficient, knocking is likely to occur.

[0060] When specifically judging the knocking condition, one or more of the above operating parameters can be used for judgment simultaneously. As long as one of them exceeds the corresponding limit value, it can be judged that the engine is in the knocking condition. Of course, according to the causal relationship between the operating parameters, when two or more of them exceed the limit value, it can also be determined as the knocking condition.

[0061] It should be noted that those skilled in the art can make corresponding adjustments and settings for the values of each operating parameter corresponding to the above knocking condition according to different engine models, which will not be elaborated here.

[0062] 103. When it is determined that the engine is in the knocking condition, adjust the ignition angle of the engine to the retarding ignition angle corresponding to the knocking condition, and adjust the retarding ignition angle according to the knocking parameter value representing the knocking degree of the engine.

[0063] In one embodiment, when it is determined that the engine is in the knocking condition, in order to timely eliminate the knocking existing in the engine, the engine can be first controlled to execute a retarding ignition angle. The retarding ignition angle is a concept opposite to the ignition angle (i.e., the ignition advance angle). Among them,

[0064] Ignition advance angle: It refers to that the spark plug starts to ignite before the piston reaches the top dead center. The purpose of doing this is to make the combustion of the air-fuel mixture in the combustion chamber reach the best state. Since the combustion of the air-fuel mixture requires a certain amount of time, it is necessary to ignite in advance so that when the piston moves downward, the air-fuel mixture can reach the maximum pressure, thereby converting more energy into power.

[0065] Retarding ignition angle: Opposite to the ignition advance angle, it refers to that the spark plug starts to ignite after the piston reaches the top dead center. It can reduce the peak temperature and pressure in the combustion chamber, and thus reduce the occurrence of engine knocking.

[0066] The ignition retard angle here can be determined from a calibration table according to the knocking value detected by a knocking sensor and the current opening degree of the EGR valve when it is determined that the engine is in a knocking condition. The current opening degree of the EGR valve can be the opening degree of the EGR valve before the engine stalls recorded in the system, or the opening degree value obtained when detecting the EGR valve, which is not limited here.

[0067] And to further ensure the smooth operation of the engine and prevent the engine from being damaged due to knocking, the ignition retard angle can be adjusted adaptively according to the knocking degree.

[0068] 104. When the knocking parameter value exceeds the limit threshold, limit the power provided to the engine.

[0069] When a relatively serious knocking situation occurs, protection operations such as limiting the torque of the engine can be performed to avoid damage to the engine caused by excessive knocking.

[0070] This exhaust gas recirculation control method can stop the fault diagnosis process of the exhaust gas recirculation system when it is determined that the exhaust gas recirculation system is in an ice state, avoid false alarms of the exhaust gas recirculation system, and effectively reduce the failure rate of the exhaust gas recirculation system. At the same time, when it is determined that the engine is in a knocking condition according to the operating parameters of the engine, the ignition angle of the engine is adjusted to the ignition retard angle corresponding to the knocking condition, and the ignition retard angle is adjusted according to the knocking parameter value representing the knocking degree of the engine, which can effectively prevent the occurrence of engine knocking and protect the engine. When the knocking parameter value exceeds the limit threshold, limit the power provided to the engine to further protect the engine, which can effectively reduce the risk of engine damage.

[0071] In some embodiments, to further reduce the risk of engine damage due to knocking, the knocking parameter value includes: the knocking value detected by a knocking sensor. In the above embodiments, adjusting the ignition retard angle according to the knocking parameter value representing the knocking degree of the engine can specifically include:

[0072] If the knocking value is less than the first threshold, then reduce the ignition retard angle.

[0073] If the knocking value is greater than the first threshold and less than the second threshold, then the ignition retard angle remains unchanged.

[0074] If the knocking value is greater than the second threshold and not greater than the limit threshold, then increase the ignition retard angle.

[0075] Specifically, refer to Figure 2As shown, when it is detected that the exhaust gas recirculation system has frozen, the diagnosis of faults such as EGR valve sticking and EGR flow is no longer carried out. At the same time, the knock intensity is detected and the self-learning of ignition angle retardation is carried out: when the engine speed, charge, torque, and load ratio are all greater than the corresponding limit values, it is in an easy-to-knock working condition. At this time, the ignition angle is actively retarded by X degrees. When the knock value is less than the limit value LIM1, the retardation angle X decreases; if the knock value is between the limit values LIM1 and LIM2, the ignition angle retardation X remains unchanged; if the knock is greater than the limit value LIM2, the ignition angle retardation X increases. The intensity of increase and decrease can be set with a fixed step size according to the actual situation, or the step size of ignition angle increase or decrease can be dynamically adjusted according to the severity of increase or decrease of the knock value, which is not limited here. If the knock value is greater than the limit value LIM3, the engine is immediately torque-limited to protect it.

[0076] In some other embodiments, to more accurately determine whether the exhaust gas recirculation system has frozen to improve the smooth progress of subsequent engine knock protection, determining whether the exhaust gas recirculation system is in a frozen state in the above embodiments may specifically include:

[0077] If the ambient temperature is lower than the first temperature value, the temperature of the EGR valve is lower than the second temperature value, and there is a stuck opening when driving the EGR valve to act, it is determined to be in a frozen state.

[0078] If the ambient temperature is within the first temperature range, the temperature of the EGR valve is lower than the second temperature value, the temperature of the engine coolant is lower than the third temperature value, and there is a stuck opening when driving the EGR valve to act, it is determined to be in a frozen state, and the minimum value of the first temperature range is the first temperature value.

[0079] If the temperature of the EGR valve is not lower than the second temperature value, or the temperature of the coolant is not lower than the third temperature value, or the ambient temperature is not lower than the maximum value of the first temperature range, it is determined not to be in a frozen state.

[0080] Specifically, referring to Figure 3 As shown, the EGR temperature is the temperature of the EGR valve:

[0081] If the ambient temperature is lower than T1 °C (for example: -22 °C), the temperature is very low and the risk of freezing is high. At this time, if the EGR temperature is lower than T3 °C (for example: 0 °C), the EGR valve is driven to act once from 0% to 100%. If it gets stuck at a certain opening, it is determined that the EGR is frozen. Continuously monitor the EGR temperature. When it is higher than T3 °C (for example: 0 °C), it is determined that the EGR has thawed.

[0082] If the ambient temperature is between T2 °C and T1 °C (e.g., -7 °C to -22 °C), and the air temperature is low with a risk of icing. At this time, if the EGR temperature is lower than T3 °C (e.g., 0 °C), and the water temperature is lower than T4 °C (e.g., 60 °C), drive the EGR valve to act once from 0% to 100%. If it gets stuck at a certain opening degree, it is determined that the EGR is frozen. Continuously monitor the EGR temperature and the water temperature. When the EGR temperature is higher than T3 °C (e.g., 0 °C) or the water temperature is higher than T4 (e.g., 60 °C), it is judged that the EGR has thawed.

[0083] If the ambient temperature is above T2 °C (e.g., -7 °C), there is no risk of EGR icing.

[0084] Among them, when it is determined that the exhaust gas recirculation system has frozen, an EGR icing protection strategy (i.e., the processing procedures in steps 102 - 104 in the above embodiments) is executed to protect the engine. When it is determined that the exhaust gas recirculation system has not frozen (or during thawing), the EGR icing protection strategy can be lifted, and the control can be carried out according to the normal control strategy of the exhaust gas recirculation system.

[0085] When judging whether the exhaust gas recirculation system is frozen, it can also be judged according to the detection data of other temperature sensors (such as the intake air temperature sensor), actuators (whether the EGR flow is normal), etc., which is not limited here.

[0086] This exhaust gas recirculation control method can, when the exhaust gas recirculation system freezes and the engine is operating under a large load condition, not perform the fault diagnosis and alarm of the exhaust gas recirculation system, and ensure the normal operation of the engine by actively retarding the ignition angle or limiting the torque, which can effectively reduce the risk of engine damage during the thawing process.

[0087] The above introduced a kind of exhaust gas recirculation control method provided by the embodiments of the present application. Next, the device for executing the above exhaust gas recirculation control method will be introduced.

[0088] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of an exhaust gas recirculation control device provided by the embodiments of the present application. As Figure 4 shown, this exhaust gas recirculation control device includes:

[0089] An icing state determination module 401, used to determine whether the exhaust gas recirculation system is in an icing state.

[0090] A knock condition determination module 402, used to stop the fault diagnosis process of the exhaust gas recirculation system when the icing state determination module 401 determines that the exhaust gas recirculation system is in an icing state, and determine whether the engine is in a knock condition according to the operating parameters of the engine.

[0091] The ignition retard angle control module 403 is configured to, when the knock condition determination module 402 determines that the engine is in a knock condition, adjust the ignition angle of the engine to the ignition retard angle corresponding to the knock condition, and adjust the ignition retard angle according to the knock parameter value characterizing the engine knock degree. And,

[0092] The engine torque limit module 404 is configured to limit the power provided by the engine when the knock parameter value exceeds the limit threshold.

[0093] In a possible implementation, the knock parameter value includes: the knock value detected by the knock sensor. The process in which the ignition retard angle control module 403 adjusts the ignition retard angle according to the knock parameter value characterizing the engine knock degree includes:

[0094] If the knock value is less than the first threshold, the ignition retard angle is decreased;

[0095] If the knock value is greater than the first threshold and less than the second threshold, the ignition retard angle remains unchanged;

[0096] If the knock value is greater than the second threshold and not greater than the limit threshold, the ignition retard angle is increased.

[0097] In a possible implementation, the process in which the icing state determination module 401 determines whether the exhaust gas recirculation system is in an icing state includes:

[0098] If the ambient temperature is lower than the first temperature value, the temperature of the EGR valve is lower than the second temperature value, and there is a stuck opening when driving the EGR valve to act, it is determined that it is in an icing state.

[0099] In a possible implementation, the process in which the icing state determination module 401 determines whether the exhaust gas recirculation system is in an icing state further includes:

[0100] If the ambient temperature is within the first temperature range, the temperature of the EGR valve is lower than the second temperature value, the temperature of the engine coolant is lower than the third temperature value, and there is a stuck opening when driving the EGR valve to act, it is determined that it is in an icing state, and the minimum value of the first temperature range is the first temperature value.

[0101] In a possible implementation, the process in which the icing state determination module 401 determines whether the exhaust gas recirculation system is in an icing state further includes:

[0102] If the temperature of the EGR valve is not lower than the second temperature value, or the temperature of the coolant is not lower than the third temperature value, or the ambient temperature is not lower than the maximum value of the first temperature range, it is determined that it is not in an icing state.

[0103] In a possible implementation, the process by which the knocking condition determination module 402 determines whether the engine is in a knocking condition based on the operating parameters of the engine includes:

[0104] If the parameter value of the operating parameter exceeds the limit value corresponding to the knocking condition, it is determined that the engine is in the knocking condition, and the operating parameters include one or more of: rotational speed, charge, torque, and load rate.

[0105] In a possible implementation, the process of determining the ignition retard angle corresponding to the knocking condition by the ignition retard angle control module 403 includes:

[0106] Determine the ignition retard angle from the calibration table according to the knocking value detected by the knocking sensor and the current opening of the EGR valve.

[0107] An electronic device is also provided in an embodiment of the present application. Refer to Figure 5 As shown, it shows a schematic structural diagram of an electronic device suitable for implementing the electronic device in the embodiment of the present application. The electronic device in the embodiment of the present application may include, but is not limited to, such as an ECU (Electronic Control Unit), a VCU (Vehicle Control Unit), an MCU (Micro Controller Unit), an HCU (Hybrid Control Unit), etc. Figure 5 The electronic device shown is only an example and should not impose any limitations on the functions and usage scope of the embodiment of the present application.

[0108] As Figure 5 shown, the electronic device may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 501, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 502 or the program loaded from the storage device 508 into the random access memory (RAM) 503. 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 503. The processing device 501, the ROM 502, and the RAM 503 are connected to each other through a bus 504. The input / output (I / O) interface 505 is also connected to the bus 504.

[0109] Typically, the following devices can be connected to the I / O interface 505: input devices 506 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 508 including, for example, a memory card, a hard disk, etc.; and a communication device 509. The communication device 509 can allow the electronic device to communicate with other devices wirelessly or wiredly to exchange data. Although Figure 5 an electronic device with various devices is shown, it should be understood that it is not required to implement or have all the shown devices. Instead, more or fewer devices can be implemented or had.

[0110] An embodiment of the present application also provides a computer program product including computer-readable instructions, which, when running on an electronic device, enable the electronic device to implement any of the exhaust gas recirculation control methods provided by the embodiments of the present application.

[0111] An embodiment of the present application also provides a computer-readable storage medium carrying one or more computer programs, which, when executed by an electronic device, can enable the electronic device to implement any of the exhaust gas recirculation control methods provided by the embodiments of the present application.

[0112] An embodiment of the present application also provides a vehicle including the electronic device as described in the above embodiment.

[0113] In addition, it should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided in the present application, the connection relationship between modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines.

[0114] Through the description of the above embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general hardware. Of course, it can also be implemented by dedicated hardware including application-specific integrated circuits, dedicated CPUs, dedicated memories, dedicated components, etc. Generally, functions accomplished by computer programs can be easily implemented by corresponding hardware, and the specific hardware structures for implementing the same function can also be diverse, such as analog circuits, digital circuits, or dedicated circuits, etc. However, for this application, software program implementation is a better embodiment in more cases. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disc of a computer, etc., and includes several instructions for causing a computer device (which can be a personal computer, training device, or network device, etc.) to execute the methods described in various embodiments of this application.

[0115] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product.

[0116] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are generated in whole or in part. The computer can be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions can 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 can be transmitted from a website, computer, training device, or data center to another website, computer, training device, or data center in a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that a computer can store, or a data storage device such as a training device or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

Claims

1. An exhaust gas recirculation control method, characterized in that, Including: Determine whether the exhaust gas recirculation system is in a frozen state; When the exhaust gas recirculation system is in the frozen state, stop the fault diagnosis process of the exhaust gas recirculation system, and determine whether the engine is in a knocking condition according to the operating parameters of the engine; When it is determined that the engine is in the knocking condition, adjust the ignition angle of the engine to the retarding ignition angle corresponding to the knocking condition, and adjust the retarding ignition angle according to the knocking parameter value representing the knocking degree of the engine; When the knocking parameter value exceeds the limit threshold, limit the power provided by the engine.

2. The exhaust gas recirculation control method according to claim 1, wherein The knocking parameter value includes: the knocking value detected by the knocking sensor. Adjusting the retarding ignition angle according to the knocking parameter value representing the knocking degree of the engine includes: If the knocking value is less than the first threshold, reduce the retarding ignition angle; If the knocking value is greater than the first threshold and less than the second threshold, the retarding ignition angle remains unchanged; If the knocking value is greater than the second threshold and not greater than the limit threshold, increase the retarding ignition angle.

3. The exhaust gas recirculation control method according to claim 1, characterized in that, Determining whether the exhaust gas recirculation system is in a frozen state includes: If the ambient temperature is lower than the first temperature value, the temperature of the EGR valve is lower than the second temperature value, and there is a stuck opening when driving the EGR valve to act, it is determined that it is in the frozen state.

4. The exhaust gas recirculation control method according to claim 3, characterized in that Determining whether the exhaust gas recirculation system is in a frozen state further includes: If the ambient temperature is within the first temperature range, the temperature of the EGR valve is lower than the second temperature value, the temperature of the engine coolant is lower than the third temperature value, and there is the stuck opening when driving the EGR valve to act, it is determined that it is in the frozen state, and the minimum value of the first temperature range is the first temperature value.

5. The exhaust gas recirculation control method according to claim 4, wherein Determining whether the exhaust gas recirculation system is in a frozen state further includes: If the temperature of the EGR valve is not lower than the second temperature value, or the temperature of the coolant is not lower than the third temperature value, or the ambient temperature is not lower than the maximum value of the first temperature range, it is determined that it is not in the frozen state.

6. The exhaust gas recirculation control method according to any one of claims 1 to 5, characterized in that, Determining whether the engine is in a knocking condition according to the operating parameters of the engine includes: If the parameter value of the operating parameter exceeds the limit value corresponding to the knocking condition, it is determined that the engine is in the knocking condition. The operating parameters include one or more of speed, charge, torque, and load ratio.

7. The exhaust gas recirculation control method according to any one of claims 1 to 5, characterized in that The determination process of the retarding ignition angle corresponding to the knocking condition includes: Determine the retarding ignition angle from the calibration table according to the knocking value detected by the knocking sensor and the current opening of the EGR valve.

8. An exhaust gas recirculation control device, characterized in that, Including: A frozen state determination module for determining whether the exhaust gas recirculation system is in a frozen state; A knocking condition determination module for stopping the fault diagnosis process of the exhaust gas recirculation system when the frozen state determination module determines that the exhaust gas recirculation system is in the frozen state, and determining whether the engine is in the knocking condition according to the operating parameters of the engine; A retarding ignition angle control module, configured to adjust the ignition angle of the engine to a retarding ignition angle corresponding to the knocking condition when the knocking condition determination module determines that the engine is in the knocking condition, and adjust the retarding ignition angle according to a knocking parameter value characterizing the knocking degree of the engine; And, An engine torque limiting module, configured to limit the power provided by the engine when the knocking parameter value exceeds a limit threshold.

9. An electronic device, characterized in that, Comprising at least one processor and a memory connected to the processor, wherein: The memory is configured to store a computer program; The processor is configured to execute the computer program, so that the electronic device can implement the exhaust gas recirculation control method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, Comprising: The electronic device according to claim 9.

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