Exhaust gas recirculation valve control method and device, vehicle, equipment and storage medium

Abstract

The invention discloses an exhaust gas recirculation valve control method and device, a vehicle, equipment and a storage medium. The method comprises the following steps: when an engine of a range extender in a vehicle is in a steady-state working condition, calculating a torque difference value between an engine model torque and a generator real torque; when the torque difference value is larger than a first threshold value, time integration is carried out; and when the result of the time integration is larger than a second threshold value, an EGR adjusting signal is triggered, and the EGR adjusting signal is used for reducing the opening degree of an EGR valve to the target opening degree corresponding to the second threshold value. According to the method, when the result of the time integration is larger than the second threshold value, it is determined that the actual output torque of the engine is not enough to meet the torque requirement and lasts for a long time, at the moment, the opening degree of the EGR valve is reduced so as to enhance the actual output torque of the engine, and therefore the charging amount and the vehicle power performance are improved, and the NVH performance is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to an exhaust gas recirculation valve control method, device, equipment, vehicle and computer-readable storage medium. Background Art

[0002] Low-pressure EGR technology can reduce pumping losses, inhibit combustion rates, reduce knock tendencies, and lower exhaust temperatures, significantly improving engine fuel economy and reducing emissions. EGR stands for Exhaust Gas Recirculation.

[0003] Currently, for extended-range vehicles, the engines of their range extenders generally operate at a high EGR rate. However, due to the significant difference between the engine's operating boundary conditions (ambient temperature, intake air temperature, and oil temperature) and the ideal boundary conditions of the test bench during actual operation, when the engine operates at a high EGR rate, the actual engine output torque will not be enough to meet the torque demand. If this phenomenon persists, it will lead to insufficient charging capacity, poor vehicle dynamic performance, and poor NVH performance. Summary of the Invention

[0004] The present application provides an exhaust gas recirculation valve control method, device, equipment, vehicle and computer-readable storage medium, which can solve the technical problem in the prior art that the actual output torque of the engine is insufficient when the engine operates at a larger EGR rate operating point.

[0005] In a first aspect, an embodiment of the present application provides an exhaust gas recirculation valve control method, the exhaust gas recirculation valve control method comprising: When the engine of the range extender in the vehicle is in a steady-state operating condition, the torque difference between the engine model torque and the actual torque of the generator is calculated; When the torque difference is greater than a first threshold, performing time integration; When the time integral result is greater than a second threshold, an EGR adjustment signal is triggered, where the EGR adjustment signal is used to reduce the opening of the EGR valve to a target opening corresponding to the second threshold.

[0006] In combination with the first aspect, in one embodiment, before calculating the torque difference between the engine model torque and the generator real torque when the engine of the range extender in the vehicle is in a steady-state operating condition, the method further includes: When the generator is in speed control mode, the engine speed difference at adjacent moments is less than the third threshold and lasts for a first period of time, and the difference in target torque output by the hybrid power control unit at adjacent moments is less than the fourth threshold and lasts for a second period of time, it is determined that the engine is in a steady-state operating condition.

[0007] In combination with the first aspect, in one embodiment, after calculating the torque difference between the engine model torque and the generator real torque when the engine of the range extender in the vehicle is in a steady-state operating condition, the method further includes: When the difference is not greater than a first threshold, the result of the time integration is attenuated.

[0008] In combination with the first aspect, in one embodiment, the exhaust gas recirculation valve control method further includes: The second threshold is determined according to the atmospheric pressure or altitude of the environment in which the vehicle is located, wherein the magnitude of the second threshold is inversely proportional to the atmospheric pressure, and the magnitude of the second threshold is directly proportional to the altitude.

[0009] In combination with the first aspect, in one embodiment, the target opening is zero, and after the EGR adjustment signal is triggered, the method further includes: In this driving cycle, there is no response to the EGR opening signal, which is used to open the EGR valve.

[0010] In combination with the first aspect, in one embodiment, after the EGR adjustment signal is triggered, the method further includes: When the reset condition is met, the EGR adjustment signal is reset.

[0011] In a second aspect, an embodiment of the present application provides an exhaust gas recirculation valve control device, the exhaust gas recirculation valve control device comprising: a calculation module, configured to calculate a torque difference between an engine model torque and a generator real torque when the engine of the range extender in the vehicle is in a steady-state operating condition; an integration module, configured to perform time integration when the torque difference is greater than a first threshold; The trigger module is configured to trigger an EGR adjustment signal when a result of the time integration is greater than a second threshold, wherein the EGR adjustment signal is configured to reduce the opening of the EGR valve to a target opening corresponding to the second threshold.

[0012] In conjunction with the second aspect, in one embodiment, the exhaust gas recirculation valve control device further includes a determination module, configured to: When the generator is in speed control mode, the engine speed difference at adjacent moments is less than the third threshold and lasts for a first period of time, and the difference in target torque output by the hybrid power control unit at adjacent moments is less than the fourth threshold and lasts for a second period of time, it is determined that the engine is in a steady-state operating condition.

[0013] In conjunction with the second aspect, in one embodiment, the exhaust gas recirculation valve control device further includes a decay module, configured to: When the difference is not greater than a first threshold, the result of the time integration is attenuated.

[0014] In conjunction with the second aspect, in one embodiment, the exhaust gas recirculation valve control device further includes a threshold adjustment module, configured to: The second threshold is determined according to the atmospheric pressure or altitude of the environment in which the vehicle is located, wherein the magnitude of the second threshold is inversely proportional to the atmospheric pressure, and the magnitude of the second threshold is directly proportional to the altitude.

[0015] In conjunction with the second aspect, in one embodiment, the exhaust gas recirculation valve control device further includes a shielding module, configured to: In this driving cycle, there is no response to the EGR opening signal, which is used to open the EGR valve.

[0016] In conjunction with the second aspect, in one embodiment, the exhaust gas recirculation valve control device further includes a reset module, configured to: When the reset condition is met, the EGR adjustment signal is reset.

[0017] In a third aspect, an embodiment of the present application provides a vehicle, comprising the exhaust gas recirculation valve control device as described in the second aspect.

[0018] In a fourth aspect, an embodiment of the present application provides an exhaust gas recirculation valve control device, which includes a processor, a memory, and an exhaust gas recirculation valve control program stored on the memory and executable by the processor, wherein when the exhaust gas recirculation valve control program is executed by the processor, the steps of the exhaust gas recirculation valve control method described in the first aspect are implemented.

[0019] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which an exhaust gas recirculation valve control program is stored, wherein when the exhaust gas recirculation valve control program is executed by a processor, the steps of the exhaust gas recirculation valve control method as described in the first aspect are implemented.

[0020] The beneficial effects of the technical solutions provided in the embodiments of the present application include: In this embodiment of the present application, when the engine of a range extender in a vehicle is in steady-state operation, the torque difference between the engine model torque and the actual generator torque is calculated. When the torque difference exceeds a first threshold, a time integration is performed. When the result of the time integration exceeds a second threshold, an EGR adjustment signal is triggered, which is used to reduce the opening of the EGR valve to a target opening corresponding to the second threshold. According to this embodiment of the present application, when the result of the time integration exceeds the second threshold, it is determined that the actual engine output torque is insufficient to meet the torque demand and has persisted for an extended period. In this case, the EGR valve opening is reduced to increase the actual engine output torque, thereby improving charging capacity, vehicle dynamics, and NVH performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of an embodiment of an exhaust gas recirculation valve control method of the present application; Figure 2 This is a functional module diagram of an embodiment of an exhaust gas recirculation valve control device of the present application; Figure 3 This is a schematic diagram of the hardware structure of the exhaust gas recirculation valve control device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] Currently, mainstream engines generally utilize low-pressure EGR technology. When implementing low-pressure EGR technology, the engine must first be bench-calibrated. The goal of bench calibration is to maintain combustion stability while selecting the highest possible EGR rate to ensure good fuel economy. For extended-range vehicles, the engine starts and operates at a fixed operating point, following the vehicle speed. Therefore, the engine operating point selection primarily focuses on the engine's optimal fuel economy zone, where the EGR rate is high. However, during actual vehicle operation, the engine's operating boundary conditions (ambient temperature, intake air temperature, and oil temperature) differ significantly from the ideal test bench boundary conditions. This results in insufficient combustion torque and increased engine vibration when the engine operates at a high EGR rate. If the vehicle operates under a stable operating condition for an extended period of time, the vehicle's charge cannot be maintained, resulting in insufficient power performance and poor NVH.

[0024] However, existing solutions cannot identify the actual combustion torque output of the engine, and therefore cannot identify the difference between the actual engine output torque and the engine model torque. As a result, when the actual engine output torque is insufficient to meet demand, the EGR function cannot be turned off in time. If this situation persists for a long time, it will lead to insufficient power and vehicle breakdown. In the embodiment of the present application, the generator torque is used to represent the actual engine torque in combination with the characteristics of the extended-range vehicle. The generator torque and the engine model torque are compared to evaluate the engine combustion performance. When EGR is working, if it is identified that the engine has poor combustion, the opening of the EGR valve can be reduced in time to enhance the actual engine output torque, thereby increasing the charging capacity and vehicle power performance and improving NVH performance.

[0025] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0026] In a first aspect, an embodiment of the present application provides an exhaust gas recirculation valve control method.

[0027] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of the exhaust gas recirculation valve control method of the present application. Figure 1 As shown, the exhaust gas recirculation valve control method includes: Step S10, when the engine of the range extender in the vehicle is in a steady-state operating condition, calculating the torque difference between the engine model torque and the actual torque of the generator; In this embodiment, in order to identify whether the engine output torque is insufficient to meet the torque requirement, it is necessary to determine whether the difference between the engine model torque and the actual engine output torque is too large. The engine model torque is determined as follows: First, the hybrid system's vehicle controller (HCU) sends a target torque to the engine control unit (ECU). The ECU converts the target torque into a target charge volume. Based on the target charge volume, the reverse torque at the current speed, torque reserve, and optimal ignition angle correction, the ECU determines the target ignition angle and target fuel injection rate. Combustion generates the engine crankshaft output torque, which is used to represent the engine model torque. The engine model torque and engine crankshaft output torque can also be calibrated using a dynamometer during bench calibration.

[0028] Furthermore, since the actual torque output by the engine is difficult to measure directly and accurately, the actual torque output by the engine is the actual torque of the generator when the engine of the range extender in the vehicle is in a steady-state condition. Among them, the actual torque of the generator is the torque output when the generator is stable at the target speed. The generator control mode is divided into speed mode and torque mode. In speed mode, the generator balances the torque at the engine crankshaft end by outputting torque to ensure that the actual speed of the range extender is at the target speed required by the HCU. P=I*V=T*N / 9550, where I is the current of the generator, V is the voltage of the generator, T is the speed of the generator, and N is the actual torque of the generator. I and V are connected by current, and the actual torque of the generator can be obtained by this formula.

[0029] It should be noted that due to the characteristics of the range extender, in most cases the generator's true torque accurately represents the engine's actual output torque when the range extender's engine is operating in steady-state conditions. This is because only in steady-state conditions do the HCU's target speed (which the generator receives for speed control) and target torque (which the engine receives for output) remain fixed. The engine's output torque (engine model torque) is also fixed. The generator's true torque reflects the actual engine output torque. Comparing the engine model torque with the generator's true torque can reveal engine combustion stability. In dynamic conditions, the HCU's target speed and target torque constantly change, making it impossible to effectively assess combustion performance.

[0030] Furthermore, in one embodiment, before step S10, the method further includes: When the generator is in speed control mode, the engine speed difference at adjacent moments is less than the third threshold and lasts for a first period of time, and the difference in target torque output by the hybrid power control unit at adjacent moments is less than the fourth threshold and lasts for a second period of time, it is determined that the engine is in a steady-state operating condition.

[0031] In this embodiment, the engine speed is collected at a first time interval and the engine speed at adjacent moments is calculated; the target torque output by the hybrid power control unit is obtained at a second time interval. The first and second time intervals are set based on actual needs, as are the third and fourth thresholds, the first and second durations, and the first and second durations.

[0032] That is, the engine is determined to be in a steady-state operating condition only when the generator is in the speed control mode, the engine speed fluctuates little over a period of time, and the target torque output by the hybrid control unit fluctuates little over a period of time.

[0033] Step S20: When the torque difference is greater than a first threshold, performing time integration; In this embodiment, the first threshold is set based on actual needs. When the torque difference is greater than the first threshold, it means that the actual torque output by the engine is significantly different from the engine model torque. If this phenomenon persists for a long time, it will lead to insufficient charging, poor vehicle power performance, and poor NVH performance. Therefore, when the torque difference is greater than the first threshold, time integration is performed. Among them, the integrator can be started to record the duration of the state of "the torque difference is greater than the first threshold" as the result of time integration. It can also be that when the torque difference is greater than the first threshold, the integral of the torque difference over time is calculated as the result of time integration.

[0034] Step S30 : When the result of the time integration is greater than the second threshold, an EGR adjustment signal is triggered, wherein the EGR adjustment signal is used to reduce the opening of the EGR valve to a target opening corresponding to the second threshold.

[0035] In this embodiment, when the result of the time integration is greater than the second threshold, it is determined that the actual output torque of the engine is significantly different from the engine model torque, and this phenomenon lasts for a long time. At this time, the EGR adjustment signal is triggered to reduce the opening of the EGR valve to the target opening corresponding to the second threshold, thereby enhancing the actual output torque of the engine.

[0036] The second threshold can have multiple values, for example, X1, X2, and X3, from largest to smallest, and the target openings corresponding to X1, X2, and X3 are, for example, 0%, 2%, and 5%, respectively. That is, when the time-integrated result is greater than X3, the EGR adjustment signal is triggered to reduce the EGR valve opening to 5%. Thereafter, if the time-integrated result continues to increase and is greater than X2, the EGR adjustment signal is triggered to reduce the EGR valve opening to 2%. Thereafter, if the time-integrated result continues to increase and is greater than X1, the EGR adjustment signal is triggered to reduce the EGR valve opening to 0%, i.e., close the EGR valve.

[0037] Furthermore, in one embodiment, the exhaust gas recirculation valve control method further includes: The second threshold is determined according to the atmospheric pressure or altitude of the environment in which the vehicle is located, wherein the magnitude of the second threshold is inversely proportional to the atmospheric pressure, and the magnitude of the second threshold is directly proportional to the altitude.

[0038] In this embodiment, the torque difference is naturally larger and fluctuates more frequently in environments with low atmospheric pressure or high altitude than at low altitudes. This is a normal deviation caused by physical phenomena, not by a high EGR rate. Based on this, a higher second threshold can be set when atmospheric pressure is low or altitude is high, and a lower second threshold can be set when atmospheric pressure is high or altitude is low, thereby avoiding excessive interference with the EGR system. This makes this embodiment applicable to a wider range of vehicle usage scenarios.

[0039] In this embodiment of the present application, when the engine of a range extender in a vehicle is in steady-state operation, the torque difference between the engine model torque and the actual generator torque is calculated. When the torque difference exceeds a first threshold, a time integration is performed. When the result of the time integration exceeds a second threshold, an EGR adjustment signal is triggered, which is used to reduce the opening of the EGR valve to a target opening corresponding to the second threshold. According to this embodiment of the present application, when the result of the time integration exceeds the second threshold, it is determined that the actual engine output torque is insufficient to meet the torque demand and has persisted for an extended period. In this case, the EGR valve opening is reduced to increase the actual engine output torque, thereby improving charging capacity, vehicle dynamics, and NVH performance.

[0040] Furthermore, in one embodiment, after step S10, the method further includes: When the difference is not greater than a first threshold, the result of the time integration is attenuated.

[0041] In this embodiment, if the torque difference exceeding the first threshold is transient, caused by a special operating condition (such as wheel slip or oil quality issues), or self-recoverable (such as an occasional sensor failure), and this condition occurs multiple times within a driving cycle and causes the time-integrated result to exceed the second threshold, reducing the EGR valve opening is unnecessary. To prevent mishandling, the time-integrated result is attenuated when the difference is not greater than the first threshold to prevent incidental factors from affecting the final judgment.

[0042] The result of the time integration may be attenuated according to a preset frequency and a preset attenuation value. For example, the result of the time integration may be reduced by a preset attenuation value every 10 ms.

[0043] Furthermore, in one embodiment, after step S30, the method further includes: In this driving cycle, there is no response to the EGR opening signal, which is used to open the EGR valve.

[0044] In this embodiment, once the EGR shutdown signal is triggered within the current driving cycle (from ignition on to engine off), the EGR system will remain forcibly closed for the remainder of the current driving cycle. This ensures that the engine always operates in the safer basic mode (no EGR) within the current driving cycle, avoiding the risks and instability caused by repeated EGR starts and stops.

[0045] Furthermore, in one embodiment, after step S30, the method further includes: When the reset condition is met, the EGR adjustment signal is reset.

[0046] In this embodiment, the reset condition is set based on actual needs. For example, the reset condition is that the vehicle has been locked and dormant for at least one time. That is, after the vehicle has been locked and dormant for at least one time, the EGR adjustment signal is automatically cleared at the next start, thereby allowing the EGR function to resume.

[0047] In a second aspect, an embodiment of the present application also provides an exhaust gas recirculation valve control device.

[0048] In one embodiment, referring to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of the exhaust gas recirculation valve control device of this application. Figure 3 As shown, the exhaust gas recirculation valve control device includes: A calculation module 10 is used to calculate the torque difference between the engine model torque and the actual torque of the generator when the engine of the range extender in the vehicle is in a steady-state operating condition; an integration module 20, configured to perform time integration when the torque difference is greater than a first threshold; The triggering module 30 is configured to trigger an EGR adjustment signal when a result of the time integration is greater than a second threshold, wherein the EGR adjustment signal is configured to reduce the opening of the EGR valve to a target opening corresponding to the second threshold.

[0049] Furthermore, in one embodiment, the exhaust gas recirculation valve control device further includes a determination module configured to: When the generator is in speed control mode, the engine speed difference at adjacent moments is less than the third threshold and lasts for a first period of time, and the difference in target torque output by the hybrid power control unit at adjacent moments is less than the fourth threshold and lasts for a second period of time, it is determined that the engine is in a steady-state operating condition.

[0050] Furthermore, in one embodiment, the exhaust gas recirculation valve control device further includes a decay module, configured to: When the difference is not greater than a first threshold, the result of the time integration is attenuated.

[0051] Furthermore, in one embodiment, the exhaust gas recirculation valve control device further includes a threshold adjustment module, configured to: The second threshold is determined according to the atmospheric pressure or altitude of the environment in which the vehicle is located, wherein the magnitude of the second threshold is inversely proportional to the atmospheric pressure, and the magnitude of the second threshold is directly proportional to the altitude.

[0052] Furthermore, in one embodiment, the exhaust gas recirculation valve control device further includes a shielding module, configured to: In this driving cycle, there is no response to the EGR opening signal, which is used to open the EGR valve.

[0053] Furthermore, in one embodiment, the exhaust gas recirculation valve control device further includes a reset module, configured to: When the reset condition is met, the EGR adjustment signal is reset.

[0054] Among them, the functional implementation of each module in the above-mentioned exhaust gas recirculation valve control device corresponds to the various steps in the above-mentioned exhaust gas recirculation valve control method embodiment, and their functions and implementation processes are no longer repeated here.

[0055] In a third aspect, an embodiment of the present application provides a vehicle.

[0056] In this embodiment, the vehicle includes an exhaust gas recirculation valve control device. Of course, the vehicle also includes other conventional components, which are not described in detail here. The specific embodiments of the third aspect refer to the description of the first and second aspects and are not described in detail here.

[0057] In a fourth aspect, an embodiment of the present application provides an exhaust gas recirculation valve control device, which may be an engine control unit, a hybrid power system vehicle controller, or other device with data processing capabilities.

[0058] Reference Figure 3 , Figure 3 Schematic diagram of the hardware structure of the exhaust gas recirculation valve control device involved in the embodiment of the present application. In the embodiment of the present application, the exhaust gas recirculation valve control device may include a processor, a memory, a communication interface and a communication bus.

[0059] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0060] Communication interfaces include input / output (I / O), physical, and logical interfaces, which interconnect components within the exhaust gas recirculation valve control device and other devices (such as other computing devices or user devices). Physical interfaces can include Ethernet, fiber optic, and ATM interfaces; user devices can include displays and keyboards.

[0061] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0062] The processor may be a general-purpose processor that can invoke an exhaust gas recirculation valve control program stored in a memory and execute the exhaust gas recirculation valve control method provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The methods executed when the exhaust gas recirculation valve control program is invoked can be referenced from the various embodiments of the exhaust gas recirculation valve control method of the present application and will not be further described here.

[0063] Those skilled in the art will understand that Figure 3 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0064] In a fifth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0065] The computer-readable storage medium of the present application stores an exhaust gas recirculation valve control program, wherein when the exhaust gas recirculation valve control program is executed by a processor, the steps of the exhaust gas recirculation valve control method as described above are implemented.

[0066] Among them, the method implemented when the exhaust gas recirculation valve control program is executed can refer to the various embodiments of the exhaust gas recirculation valve control method of the present application, and will not be repeated here.

[0067] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0068] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0069] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0070] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0071] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0072] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of this application.

[0073] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling an exhaust gas recirculation valve, characterized in that: The exhaust gas recirculation valve control method includes: When the engine of the range extender in the vehicle is in a steady-state operating condition, the torque difference between the engine model torque and the actual torque of the generator is calculated; When the torque difference is greater than a first threshold, performing time integration; When the time integral result is greater than a second threshold, an EGR adjustment signal is triggered, where the EGR adjustment signal is used to reduce the opening of the EGR valve to a target opening corresponding to the second threshold.

2. The exhaust gas recirculation valve control method according to claim 1, characterized in that: Before calculating the torque difference between the engine model torque and the actual torque of the generator when the engine of the range extender in the vehicle is in a steady-state operating condition, the method further includes: When the generator is in speed control mode, the engine speed difference at adjacent moments is less than the third threshold and lasts for a first period of time, and the difference in target torque output by the hybrid power control unit at adjacent moments is less than the fourth threshold and lasts for a second period of time, it is determined that the engine is in a steady-state operating condition.

3. The exhaust gas recirculation valve control method according to claim 1, characterized in that: After calculating the torque difference between the engine model torque and the actual torque of the generator when the engine of the range extender in the vehicle is in a steady-state operating condition, the method further includes: When the difference is not greater than a first threshold, the result of the time integration is attenuated.

4. The exhaust gas recirculation valve control method according to claim 1, characterized in that: The exhaust gas recirculation valve control method further includes: The second threshold is determined according to the atmospheric pressure or altitude of the environment in which the vehicle is located, wherein the magnitude of the second threshold is inversely proportional to the atmospheric pressure, and the magnitude of the second threshold is directly proportional to the altitude.

5. The exhaust gas recirculation valve control method according to claim 1, characterized in that: The target opening is zero, and after the EGR adjustment signal is triggered, the method further includes: In this driving cycle, there is no response to the EGR opening signal, which is used to open the EGR valve.

6. The exhaust gas recirculation valve control method according to claim 5, characterized in that: After triggering the EGR adjustment signal, the method further includes: When the reset condition is met, the EGR adjustment signal is reset.

7. An exhaust gas recirculation valve control device, characterized in that: The exhaust gas recirculation valve control device includes: a calculation module, configured to calculate a torque difference between an engine model torque and a generator real torque when the engine of the range extender in the vehicle is in a steady-state operating condition; an integration module, configured to perform time integration when the torque difference is greater than a first threshold; The trigger module is configured to trigger an EGR adjustment signal when a result of the time integration is greater than a second threshold, wherein the EGR adjustment signal is configured to reduce the opening of the EGR valve to a target opening corresponding to the second threshold.

8. A vehicle, characterized in that: The vehicle includes the exhaust gas recirculation valve control device according to claim 7.

9. An exhaust gas recirculation valve control device, characterized in that: The exhaust gas recirculation valve control device includes a processor, a memory, and an exhaust gas recirculation valve control program stored on the memory and executable by the processor, wherein when the exhaust gas recirculation valve control program is executed by the processor, the steps of the exhaust gas recirculation valve control method as described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores an exhaust gas recirculation valve control program, wherein when the exhaust gas recirculation valve control program is executed by a processor, the steps of the exhaust gas recirculation valve control method according to any one of claims 1 to 6 are implemented.

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