Gear shifting auxiliary control method of hybrid vehicle and hybrid vehicle

Abstract

The invention provides a gear shifting auxiliary control method of a hybrid vehicle and the hybrid vehicle. The technical problems that energy is wasted due to the fact that the gear shifting time of the hybrid vehicle is long and gear shifting fails when a motor breaks down in the prior art are solved. According to the gear shifting auxiliary control method of the hybrid vehicle and the hybrid vehicle, the rotating speed of the power input shaft of the gearbox is regulated and controlled by regulating and controlling the opening degree and / or the valve closing rate of the exhaust throttle valve, so that the rotating speed of the power input shaft of the gearbox is consistent with the rotating speed of the power output shaft of the gearbox; therefore, the hybrid assembly is assisted in gear shifting to achieve rapid gear shifting, the gear shifting duration in the gear shifting process is shortened, energy waste caused by long gear shifting time of the hybrid gearbox is effectively reduced, and when a motor is adopted for driving, even if the motor breaks down, gear shifting can still be completed.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle control, and particularly to a shift assist control method for a hybrid vehicle and a hybrid vehicle. Background Art

[0002] A hybrid vehicle (i.e., a hybrid power vehicle) is a vehicle equipped with more than two power sources. The hybrid vehicle has advantages such as high overall system efficiency. At the same time, the hybrid transmission also has multiple gears. Usually, the vehicle control unit sends a shift command to the transmission control unit, and the transmission control unit executes the shift of the hybrid transmission according to the shift command.

[0003] When the hybrid transmission shifts gears normally, the shift can be achieved by adjusting the speed of the motor or the speed of the engine. If the motor fails when using the motor speed adjustment to achieve the shift, it will cause a long shift time or even a shift failure; if the engine speed adjustment (such as natural deceleration) is used to achieve the shift, the speed adjustment of the engine is slow, resulting in a long power interruption time during the shift of the hybrid transmission, thus causing problems such as energy waste. Summary of the Invention

[0004] In view of this, the present application provides a shift assist control method for a hybrid vehicle and a hybrid vehicle. By adjusting the opening degree and / or the valve closing rate of the exhaust throttle valve, the rotational speed of the power input shaft of the transmission is adjusted so that the rotational speed of the power input shaft of the transmission is consistent with the rotational speed of the power output shaft of the transmission, thereby assisting the hybrid assembly to shift gears to achieve a quick shift, reducing the shift duration during the shift process, effectively reducing the energy waste caused by the long shift time of the hybrid transmission, and even when the motor is used as the drive, the shift can still be completed even if the motor fails.

[0005] To achieve the above object, the present application provides the following technical solution: A shift assist control method for a hybrid vehicle, characterized in that the hybrid vehicle includes a hybrid system, an exhaust throttle valve, and a transmission, and the hybrid system includes a motor and an engine; wherein, the shift assist control method includes: obtaining the working mode and the shift mode of the hybrid vehicle; adjusting the working parameters of the exhaust throttle valve according to the working mode and the shift mode to adjust the rotational speed of the engine to be consistent with the target rotational speed of the power output shaft of the transmission; wherein, the working parameters include the opening degree of the exhaust throttle valve and / or the valve closing rate of the exhaust throttle valve.

[0006] In an embodiment of the present application, regulating the operating parameters of the exhaust throttle valve according to the operating mode and the shifting mode includes: when the current operating mode of the hybrid vehicle is the hybrid mode and the shifting mode is the upshift mode, obtaining the current state of charge value of the power battery; when the current state of charge value is greater than the preset state of charge value, regulating the operating parameters of the exhaust throttle valve according to the actual speed and the target speed of the engine, so as to regulate the speed of the engine to be consistent with the target speed of the power output shaft of the transmission.

[0007] In an embodiment of the present application, regulating the operating parameters of the exhaust throttle valve according to the actual speed and the target speed of the engine includes: calculating a speed regulation difference according to the actual speed and the target speed of the engine; calculating the target exhaust throttle valve closing rate and the target exhaust throttle valve opening according to the speed regulation difference; regulating the opening of the exhaust throttle valve to the target exhaust throttle valve opening, and regulating the closing rate of the exhaust throttle valve to the target exhaust throttle valve closing rate.

[0008] In an embodiment of the present application, regulating the operating parameters of the exhaust throttle valve according to the actual speed and the target speed of the engine further includes: calculating a pressure difference according to the actual exhaust pressure and the preset exhaust pressure of the exhaust throttle valve; calculating a pressure regulation correction coefficient and a first opening correction coefficient according to the pressure difference; correcting the target exhaust throttle valve closing rate according to the pressure regulation correction coefficient; correcting the target exhaust throttle valve opening according to the first opening correction coefficient; regulating the opening of the exhaust throttle valve to the corrected target exhaust throttle valve opening, and regulating the closing rate of the exhaust throttle valve to the corrected target exhaust throttle valve closing rate.

[0009] In an embodiment of the present application, regulating the operating parameters of the exhaust throttle valve according to the actual speed and the target speed of the engine further includes: determining a second opening correction coefficient of the exhaust throttle valve according to the actual post-treatment temperature of the exhaust throttle valve; calculating a comprehensive opening correction coefficient of the exhaust throttle valve according to the second opening correction coefficient and the first opening correction coefficient; correcting the target exhaust throttle valve opening according to the comprehensive opening correction coefficient; regulating the opening of the exhaust throttle valve to the target exhaust throttle valve opening corrected by the comprehensive opening correction coefficient.

[0010] In an embodiment of the present application, the shifting auxiliary control method further includes: generating a throttle valve fault message when the actual exhaust pressure of the exhaust throttle valve is less than a preset exhaust pressure fault threshold.

[0011] In an embodiment of the present application, the shift assist control method further includes: when the current state of charge value is less than or equal to the preset state of charge value, adjusting the opening degree of the exhaust throttle valve to 100%.

[0012] In an embodiment of the present application, the adjusting the working parameters of the exhaust throttle valve according to the working mode and the shift mode includes: when the current working mode of the hybrid vehicle is the hybrid mode and the downshift mode, adjusting the opening degree of the exhaust throttle valve to 100%; or when the current working mode of the hybrid vehicle is the pure engine mode and the shift mode is the downshift mode, adjusting the opening degree of the exhaust throttle valve to 100% to adjust the engine speed to be consistent with the target speed of the power output shaft of the transmission.

[0013] In an embodiment of the present application, the adjusting the working parameters of the exhaust throttle valve according to the working mode and the shift mode includes: when the current working mode of the hybrid vehicle is the pure engine mode and the shift mode is the upshift mode, adjusting the working parameters of the exhaust throttle valve according to the actual speed and the target speed of the engine to adjust the engine speed to be consistent with the target speed of the power output shaft of the transmission.

[0014] As a second aspect of the present application, the present application further provides a hybrid vehicle, including: a hybrid system, the hybrid system includes a power battery, an engine and an electric motor, wherein the power battery provides electric energy for the electric motor; a transmission, the power output shaft of the engine is connected to the power input shaft of the transmission, and the power output shaft of the electric motor is connected to the power input shaft of the transmission; an exhaust throttle valve, adjusting the working parameters of the exhaust throttle valve to adjust the engine speed; and a controller, the controller is used to execute the above-mentioned shift assist control method.

[0015] The shift assist control method and the hybrid vehicle provided by the present application adjust the engine speed by adjusting the opening degree and / or the valve closing rate of the exhaust throttle valve, so as to adjust the speed of the power input shaft of the transmission to make the speed of the power input shaft of the transmission consistent with the speed of the power output shaft of the transmission, thereby assisting the hybrid assembly to shift gears to achieve fast shifting, reducing the shift duration during the shifting process, effectively reducing the energy waste caused by the long shift time of the hybrid transmission, and when using the electric motor as the drive, even if the electric motor fails, the shift can still be completed, further improving the power stability of the hybrid vehicle. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0017] Figure 1 This is a working principle diagram of a hybrid vehicle provided by an embodiment of the present application.

[0018] Figure 2 This is a schematic flowchart of a shift assist control method for a hybrid vehicle provided by an embodiment of the present application.

[0019] Figure 3 This is a schematic flowchart of a shift assist control method for a hybrid vehicle provided by another embodiment of the present application.

[0020] Figure 4 This is a schematic flowchart of a shift assist control method for a hybrid vehicle provided by another embodiment of the present application.

[0021] Figure 5 This is a schematic flowchart of a shift assist control method for a hybrid vehicle provided by another embodiment of the present application.

[0022] Figure 6 This is a schematic flowchart of a shift assist control method for a hybrid vehicle provided by another embodiment of the present application.

[0023] Figure 7 This is a schematic flowchart of a shift assist control method for a hybrid vehicle provided by another embodiment of the present application. Detailed implementation manners

[0024] The technical solutions of the embodiments of the present application are applicable to the application scenario of shift control of hybrid vehicles. The hybrid vehicle can be a passenger vehicle or a commercial vehicle. Figure 1 The following shows a working principle diagram of a hybrid vehicle provided by an embodiment of the present application. As Figure 1 shown, the hybrid vehicle includes:

[0025] A hybrid system 100, which includes a power battery 101, an engine 103, and a motor 102. Among them, the power battery 101 provides electrical energy for the motor 102. The fuel drive of the hybrid vehicle is realized through the engine 103, and the electric drive of the hybrid vehicle is realized through the power battery 101 and the motor 102.

[0026] The transmission 200 has its power input shaft connected to the power output shaft of the engine 103, and the power output shaft of the motor 102 is connected to the power input shaft of the transmission 300. The power output shaft of the transmission 200 is then connected to the driving component to drive the vehicle to move. Specifically, the transmission 200 can be a mechanical continuously variable transmission (CVT), an electronically controlled mechanical automatic transmission (AMT), a dual-clutch automatic transmission (DCT), etc.

[0027] The exhaust throttle valve 300 controls the fluid flow rate by changing the throttle cross-section or throttle length, thereby regulating the rotational speed of the engine 103.

[0028] When a hybrid vehicle needs to shift gears, if the working mode of the hybrid vehicle is the hybrid mode, that is, when the motor is used as the drive, gear shifting can be achieved by adjusting the rotational speed of the motor. For example, when upshifting, the motor applies a negative torque on the input shaft to quickly decelerate, and when downshifting, the motor applies a positive torque on the input shaft to quickly increase the torque. However, when the motor fails, the engine automatically decelerates to achieve gear shifting. However, the automatic deceleration of the engine is slow, resulting in a long gear shifting time and even the problem of gear shifting failure. In order to improve the gear shifting rate, engine in-cylinder braking can be used to achieve rapid gear shifting. However, many engines, especially small-displacement engines, do not have in-cylinder braking, and in-cylinder braking is only applicable to engine drive and is not applicable to motor drive. Therefore, the applicability of using in-cylinder braking to achieve rapid gear shifting is small.

[0029] Based on the above technical status quo, through research, the inventors of the present application propose that when a hybrid vehicle needs to shift gears, whether it is motor drive or engine drive, the working parameters of the exhaust throttle valve (such as the opening degree of the exhaust throttle valve and / or the valve closing rate of the exhaust throttle valve) can be adjusted to regulate the rotational speed of the engine, thereby achieving the regulation of the rotational speed of the power input shaft of the transmission, so that the rotational speed of the power input shaft of the transmission is consistent with the rotational speed of the power output shaft of the transmission, and gear shifting can be completed more quickly, reducing problems such as energy waste. In addition, when the motor is used as the drive, even if the motor fails, gear shifting can still be completed, further improving the power stability of the hybrid vehicle.

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0031] As the first aspect of the present application, the present application provides a gear shifting auxiliary control method for a hybrid vehicle. Figure 2The figure shows a schematic flowchart of a shift assist control method for a hybrid vehicle provided by an embodiment of the present application. As Figure 2 shown, a shift assist control method for a hybrid vehicle includes the following steps:

[0032] S1: Obtain the working mode and shift mode of the hybrid vehicle.

[0033] Specifically, the working modes include a hybrid mode and a pure engine mode. The hybrid mode means that the motor and the engine work together as the drive. The pure engine mode means that only the engine is used as the drive.

[0034] The shift modes include an upshift mode and a downshift mode. The upshift mode means that the vehicle speed corresponding to the target gear is higher than the vehicle speed corresponding to the current gear. The downshift mode means that the vehicle speed of the target gear is lower than the vehicle speed corresponding to the current gear.

[0035] S2: Adjust the working parameters of the exhaust throttle valve according to the working mode and the shift mode, so as to make the engine speed consistent with the target speed of the power output shaft of the transmission;

[0036] Among them, the working parameters include the opening degree of the exhaust throttle valve and / or the valve closing rate of the exhaust throttle valve.

[0037] When the hybrid vehicle needs to shift gears during operation, after determining the target gear, the target vehicle speed of the hybrid vehicle can be determined according to the target gear. According to the target vehicle speed of the hybrid vehicle and the transmission ratio between the power output shaft of the transmission and the power input shaft of the driving component, the target speed of the power output shaft of the transmission can be calculated.

[0038] Specifically, the fact that the speed of the power input shaft of the transmission is consistent with the target speed of the power output shaft of the transmission means that: the target speed of the power output shaft of the transmission and the transmission ratio between the power output shaft of the transmission and the power input shaft of the transmission can be used to calculate the theoretical speed of the power input shaft of the transmission. The theoretical speed of the power input shaft of the transmission and the transmission ratio between the power input shaft of the transmission and the power output shaft of the engine can be used to calculate the theoretical speed of the engine. The difference between the theoretical speed of the engine and the actual speed is within the error range, which can indicate that the engine speed is consistent with the target speed of the power output shaft of the transmission. For example, if the transmission ratio between the power input shaft of the transmission and the power output shaft of the transmission is 1, and the transmission ratio between the power input shaft of the transmission and the power output shaft of the engine is 1, the same engine speed as the target speed of the power output shaft of the transmission can indicate that the engine speed is consistent with the target speed of the power output shaft of the transmission.

[0039] Since the working mode and shifting mode during vehicle driving may be different, therefore, according to different working modes and different shifting modes, the working parameters (opening degree and / or valve closing rate) of the exhaust throttle valve are adjusted to adjust the engine speed, so as to adjust the rotational speed of the power input shaft of the transmission to make the rotational speed of the power input shaft consistent with the target rotational speed of the power output shaft of the transmission, so that shifting can be completed quickly. For example, when the working mode is the pure engine mode and the shifting mode is the downshift mode, the opening degree of the exhaust throttle valve can be adjusted to 100%, that is, the exhaust throttle valve is fully open, to adjust the engine speed so that the rotational speed of the power input shaft of the transmission is adjusted to be consistent with the target rotational speed of the power output shaft of the transmission.

[0040] A shifting assistance control method and a hybrid vehicle provided by the present application adjust the engine speed by adjusting the opening degree and / or valve closing rate of the exhaust throttle valve, so as to adjust the rotational speed of the power input shaft of the transmission to make the rotational speed of the power input shaft of the transmission consistent with the rotational speed of the power output shaft of the transmission, thereby assisting the hybrid assembly to shift to achieve quick shifting, reducing the shifting duration during the shifting process, effectively reducing the energy waste caused by the long shifting time of the hybrid transmission, and when using the motor as the drive, even if the motor fails, shifting can still be completed, further improving the power stability of the hybrid vehicle.

[0041] In an embodiment of the present application, as Figure 3 shown, when the working mode of the hybrid vehicle is the hybrid mode, the specific adjustment method of the working parameters of the exhaust throttle valve, that is, S2 (adjust the working parameters of the exhaust throttle valve according to the working mode and the shifting mode) specifically includes the following steps:

[0042] S20: When the current working mode of the hybrid vehicle is the hybrid mode and the shifting mode is the upshift mode, obtain the current state of charge value of the power battery;

[0043] When it is determined that the working mode of the hybrid vehicle is the hybrid mode, that is, the motor and the engine cooperate as the drive. When the hybrid vehicle runs in the hybrid mode, the motor works normally, and the state of charge value of the power battery is detected in real time.

[0044] S21: When the current working mode of the hybrid vehicle is the hybrid mode and the shifting mode is the downshift mode, adjust the opening degree of the exhaust throttle valve to 100%, that is, execute S24. When the working mode is the hybrid mode and the shifting mode is the downshift mode, regardless of whether the current state of charge value of the power battery is greater than the preset state of charge value, the opening degree of the exhaust throttle valve is adjusted to 100% to reduce the energy consumption when adjusting the rotational speed of the motor.

[0045] S22: Determine whether the current state of charge value is greater than the preset state of charge value;

[0046] When the vehicle is moving in a hybrid mode, the state of charge value of the power battery is detected in real time, and it is determined whether the state of charge value is greater than a preset state of charge value. When the judgment result of S22 is yes, that is, when the current state of charge value of the power battery is greater than the preset state of charge value, S23 is executed.

[0047] When the judgment result of S22 is no, that is, when the current state of charge value of the power battery is less than or equal to the preset state of charge value, S24 is executed.

[0048] S23: Adjust the working parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine, so as to adjust the speed of the engine to be consistent with the target speed of the power output shaft of the transmission.

[0049] When the current state of charge value of the power battery is greater than the preset state of charge value, the working parameters (opening degree and / or valve closing rate) of the exhaust throttle valve are adjusted according to the actual speed of the power input shaft of the transmission and the actual exhaust pressure of the exhaust throttle valve.

[0050] S24: Adjust the opening degree of the exhaust throttle valve to 100%.

[0051] When the current state of charge value of the power battery is less than or equal to the preset state of charge value, or when the current working mode of the hybrid vehicle is the hybrid mode and the shift mode is the downshift mode, the opening degree of the exhaust throttle valve is adjusted to 100%. That is, when the state of charge value of the power battery is low, the exhaust throttle valve is adjusted to be fully open, and the engine minimizes the braking power to allow the motor to recover more energy.

[0052] Optionally, as Figure 4 shown, S23 (adjusting the working parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine) specifically includes the following steps:

[0053] S231: Calculate the speed regulation speed difference according to the actual speed of the engine and the target speed of the engine;

[0054] Specifically, the target speed of the engine can be calculated according to the target speed of the power output shaft of the transmission, the transmission ratio between the power input shaft and the power output shaft of the transmission, and the transmission ratio between the power input shaft of the transmission and the power output shaft of the engine.

[0055] After calculating the target speed of the engine, the speed regulation speed difference of the engine can be calculated.

[0056] S232: Calculate the target exhaust throttle valve closing rate and the target exhaust throttle valve opening degree according to the speed regulation speed difference;

[0057] Specifically, the target closing rate of the exhaust throttle valve can be calculated based on the throttle valve closing rate curve of the exhaust throttle valve (the curve of the closing rate varying with time or valve stroke) and the speed regulation speed difference.

[0058] The target opening of the exhaust throttle valve is calculated based on the opening curve of the exhaust throttle valve and the speed regulation speed difference.

[0059] Specifically, when the speed regulation speed difference is large, the target closing rate of the exhaust throttle valve is large, and the target opening of the exhaust throttle valve is small. That is, when quickly closing the exhaust throttle valve, the opening of the exhaust throttle valve is as small as possible, which can accelerate the speed reduction rate.

[0060] When the speed regulation speed difference is small, the target closing rate of the exhaust throttle valve is small, and the target opening of the exhaust throttle valve is large. That is, when the speed regulation speed difference is small, when slowly closing the exhaust throttle valve, the opening of the exhaust control valve can be larger, reducing the noise, vibration, and harshness of the vehicle.

[0061] S233: Regulate the opening of the exhaust throttle valve to the target opening of the exhaust throttle valve, and regulate the closing rate of the exhaust throttle valve to the target closing rate of the exhaust throttle valve.

[0062] Optionally, as Figure 5 shown, after S232 (calculating the target closing rate and target opening of the exhaust throttle valve according to the speed regulation speed difference), S23 (regulating the working parameters of the exhaust throttle valve according to the actual speed and target speed of the engine) further includes the following steps:

[0063] S234: Determine whether the actual exhaust pressure of the exhaust throttle valve is greater than the preset exhaust pressure fault threshold;

[0064] To improve the stability of the exhaust throttle valve, record the corresponding actual exhaust pressure when the exhaust throttle valve is closed.

[0065] When the judgment result of S234 is yes, that is, when the actual exhaust pressure of the exhaust throttle valve is greater than the preset exhaust pressure fault threshold, it indicates that the exhaust throttle valve can work normally, and S235 is executed.

[0066] When the judgment result of S234 is no, that is, when the actual exhaust pressure of the exhaust throttle valve is less than or equal to the preset exhaust pressure fault threshold, it indicates that the exhaust throttle valve has a fault. At this time, a throttle valve fault message is generated, that is, S2390 is executed.

[0067] S235: Calculate the exhaust pressure difference according to the actual exhaust pressure and the preset exhaust pressure of the exhaust throttle valve;

[0068] Specifically, the preset exhaust pressure of the exhaust throttle valve can be calculated based on the exhaust pressure curve of the exhaust throttle valve and the actual engine speed.

[0069] S236: Calculate the exhaust pressure speed regulation correction coefficient and the first opening correction coefficient according to the exhaust pressure difference;

[0070] Specifically, when the actual exhaust pressure of the exhaust throttle valve is different from the preset exhaust pressure, it indicates that there is an exhaust pressure difference between the actual exhaust pressure and the preset exhaust pressure. Therefore, it is necessary to correct the closing rate of the exhaust throttle valve calculated in S232 and the opening of the target exhaust throttle valve to reduce the probability of the exhaust throttle valve malfunctioning due to changes in the exhaust pressure after frequent use of the exhaust throttle valve.

[0071] Specifically, the relationship between the exhaust pressure speed regulation correction coefficient and the exhaust pressure difference can be obtained based on experience. For example, a speed regulation correction coefficient database can be constructed, which stores the exhaust pressure difference and the corresponding speed regulation correction coefficient, and the speed regulation correction coefficient database is continuously updated and iterated through deep learning. In this way, the matching speed regulation correction coefficient can be found in the speed regulation correction coefficient database according to the exhaust pressure difference.

[0072] Similarly, the relationship between the first opening correction coefficient and the exhaust pressure difference can also be obtained based on experience. For example, an opening coefficient database can be constructed, which stores the exhaust pressure difference and the corresponding opening correction coefficient, and the opening correction coefficient database is continuously updated and iterated through deep learning. In this way, the matching first opening correction coefficient can be found in the opening correction coefficient database according to the exhaust pressure difference.

[0073] S237: Correct the closing rate of the target exhaust throttle valve according to the exhaust pressure speed regulation correction coefficient;

[0074] After obtaining the correction of the exhaust pressure speed regulation correction coefficient, the closing rate of the target exhaust throttle valve calculated in S232 can be corrected according to the exhaust pressure speed regulation correction coefficient.

[0075] S238: Correct the opening of the target exhaust throttle valve according to the first opening correction coefficient;

[0076] After obtaining the first opening correction coefficient, the opening of the target exhaust throttle valve calculated in S232 can be corrected according to the first opening correction coefficient.

[0077] S239: Regulate the opening of the exhaust throttle valve to the corrected opening of the target exhaust throttle valve, and regulate the closing rate of the exhaust throttle valve to the corrected closing rate of the target exhaust throttle valve.

[0078] After the target exhaust throttle valve opening and the target exhaust throttle valve closing rate are corrected, the exhaust throttle valve can be controlled according to the corrected target exhaust throttle valve closing rate and the corrected target exhaust throttle valve opening.

[0079] S390: Generate throttle valve fault information.

[0080] Optionally, as Figure 6 shown, after S236 (calculate the exhaust pressure speed regulation correction coefficient and the first opening correction coefficient according to the exhaust pressure difference), S23 (control the working parameters of the exhaust throttle valve according to the actual speed and the target speed of the engine) further includes the following steps:

[0081] S2361: Determine the second opening correction coefficient of the exhaust throttle valve according to the actual post-treatment temperature of the exhaust throttle valve;

[0082] The actual post-treatment temperature of the exhaust throttle valve is detected in real time. When the actual post-treatment temperature is low, the opening of the exhaust throttle valve is correspondingly small. Therefore, when the actual post-treatment temperature changes, the opening of the exhaust throttle valve also needs to be corrected accordingly. Therefore, it is necessary to determine the second opening correction coefficient according to the actual post-treatment temperature.

[0083] Specifically, the relationship between the actual post-treatment temperature of the exhaust throttle valve and the corresponding second opening correction coefficient can also be obtained according to experience. For example, an opening coefficient database can be constructed, and the post-treatment temperature and the corresponding opening correction coefficient are stored in the opening correction number database, and the opening correction coefficient database is continuously updated and iterated through deep learning. In this way, the second opening correction coefficient matching the actual post-treatment temperature can be found in the opening correction coefficient database.

[0084] S2362: Calculate the comprehensive opening correction coefficient of the exhaust throttle valve according to the second opening correction coefficient and the first opening correction coefficient;

[0085] After the second opening correction coefficient is determined, the first opening correction coefficient and the second opening correction coefficient can be multiplied to calculate the comprehensive opening correction coefficient of the exhaust throttle valve.

[0086] S2363: Correct the target exhaust throttle valve opening according to the comprehensive opening correction coefficient;

[0087] S2364: Control the opening of the exhaust throttle valve to be the target exhaust throttle valve opening corrected by the comprehensive opening correction coefficient.

[0088] After the comprehensive opening correction coefficient is calculated, the target exhaust throttle valve opening can be corrected according to the comprehensive opening correction coefficient, and the exhaust opening valve can be controlled with the corrected target exhaust throttle valve opening.

[0089] In another embodiment of the present application, as Figure 7 shown, when the operating mode of the hybrid vehicle is the pure engine mode, the specific regulation method of the operating parameters of the exhaust throttle valve, that is, S2 (regulating the operating parameters of the exhaust throttle valve according to the operating mode and the shift mode) specifically includes the following steps:

[0090] S25: When the current operating mode of the hybrid vehicle is the pure engine mode and the shift mode is the downshift mode, regulate the opening degree of the exhaust throttle valve to 100%, that is, execute S24, to regulate the rotational speed of the power input shaft of the transmission to be consistent with the target rotational speed of the power output shaft of the transmission.

[0091] S26: When the current operating mode of the hybrid vehicle is the pure engine mode and the shift mode is the upshift mode, regulate the operating parameters of the exhaust throttle valve according to the actual rotational speed of the engine and the target rotational speed of the engine, so that the regulated rotational speed is consistent with the target rotational speed of the power output shaft of the transmission, that is, execute S23.

[0092] As the second aspect of the present application, the present application further provides a controller, and the controller is communicatively connected to Figure 1 the exhaust throttle valve therein, a pressure sensor for detecting the actual exhaust pressure of the exhaust throttle valve, a temperature sensor for detecting the post-treatment temperature of the exhaust throttle valve, the exhaust throttle valve, and a speed sensor for detecting the engine speed, so as to execute the steps in the above-mentioned shift assist control method.

[0093] The method in the present application 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. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device, an OAM, or other programmable devices.

[0094] The computer program product can be written in any combination of one or more programming languages for the program code to execute the operations of the embodiments of the present application. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0095] The computer program or instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0096] In addition, an embodiment of the present application can also be a storage medium on which a computer program is stored, and the computer program is executed by a processor to perform the steps in the shift assist control method described in any of the above embodiments of this specification:

[0097] For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0098] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0099] The steps in the methods of the embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the technical features recorded in each embodiment can be replaced or combined. The devices in the embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0100] Those skilled in the art may further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0101] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be directly implemented by hardware, software units executed by a processor, or a combination of the two. The software units can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0102] Finally, it should also be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0103] The above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hybrid vehicle shift assist control method, characterized in that: The hybrid vehicle includes a hybrid system, an exhaust throttle valve and a gearbox, and the hybrid system includes a motor and an engine; Wherein, the gear shift assist control method comprises: Acquiring an operating mode and a shifting mode of the hybrid vehicle; regulating the operating parameters of the exhaust throttle valve according to the operating mode and the shifting mode, so as to regulate the speed of the engine to be consistent with the target speed of the power output shaft of the gearbox; Wherein, the working parameters include the opening degree of the exhaust throttle valve and / or the closing rate of the exhaust throttle valve.

2. The shift assist control method according to claim 1, characterized in that: The step of regulating the working parameters of the exhaust throttle valve according to the working mode and the shifting mode includes: When the current working mode of the hybrid vehicle is the hybrid mode and the gear shifting mode is the upshifting mode, obtaining a current state of charge value of the power battery; When the current state of charge value is greater than the preset state of charge value, the working parameters of the exhaust throttle valve are regulated according to the actual speed of the engine and the target speed of the engine to regulate the speed of the engine to be consistent with the target speed of the power output shaft of the gearbox.

3. The shift assist control method according to claim 2, characterized in that: The step of regulating the working parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine includes: Calculating a speed difference according to the actual speed of the engine and the target speed of the engine; Calculating a target exhaust throttle valve closing rate and a target exhaust throttle valve opening of the exhaust throttle valve according to the speed adjustment speed difference; The opening degree of the exhaust throttle valve is regulated to be a target exhaust throttle valve opening degree, and the closing rate of the exhaust throttle valve is regulated to be the target exhaust throttle valve closing rate.

4. The shift assist control method according to claim 3, characterized in that: The method of regulating the working parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine also includes: Calculating an exhaust pressure difference according to an actual exhaust pressure of the exhaust throttle valve and a preset exhaust pressure; Calculate the discharge pressure speed regulation correction coefficient and the first opening correction coefficient according to the discharge pressure difference; Correcting the target exhaust throttle valve closing rate according to the exhaust pressure speed regulation correction coefficient; Correcting the target exhaust throttle valve opening according to the first opening correction coefficient; The opening of the exhaust throttle valve is regulated to be a corrected target exhaust throttle valve opening, and the closing rate of the exhaust throttle valve is regulated to be a corrected target exhaust throttle valve closing rate.

5. The shift assist control method according to claim 4, characterized in that: The method of regulating the working parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine also includes: determining a second opening correction coefficient of the exhaust throttle valve according to an actual after-treatment temperature of the exhaust throttle valve; Calculating a comprehensive opening correction coefficient of the exhaust throttle valve according to the second opening correction coefficient and the first opening correction coefficient; Correcting the target exhaust throttle valve opening according to the comprehensive opening correction coefficient; The opening of the exhaust throttle valve is regulated to be a target exhaust throttle valve opening corrected by the comprehensive opening correction coefficient.

6. The shift assist control method according to claim 2, characterized in that: The shift assist control method further includes: When the actual exhaust pressure of the exhaust throttle valve is less than a preset exhaust pressure fault threshold, throttle valve fault information is generated.

7. The shift assist control method according to claim 2, characterized in that: The shift assist control method further includes: When the current state of charge value is less than or equal to the preset state of charge value, the opening of the exhaust throttle valve is adjusted to 100%.

8. The shift assist control method according to claim 1, characterized in that: The step of regulating the working parameters of the exhaust throttle valve according to the working mode and the shifting mode includes: When the current working mode of the hybrid vehicle is the hybrid mode and the downshift mode, adjusting the opening of the exhaust throttle valve to 100%; or When the current working mode of the hybrid vehicle is the pure engine mode and the shift mode is the downshift mode, the opening of the exhaust throttle valve is regulated to 100% to regulate the speed of the engine to be consistent with the target speed of the power output shaft of the gearbox.

9. The shift assist control method according to claim 1, characterized in that: The step of regulating the working parameters of the exhaust throttle valve according to the working mode and the shifting mode includes: When the current working mode of the hybrid vehicle is the pure engine mode and the shift mode is the upshift mode, the working parameters of the exhaust throttle valve are regulated according to the actual speed of the engine and the target speed of the engine to regulate the speed of the engine to be consistent with the target speed of the power output shaft of the gearbox.

10. A hybrid vehicle, characterized in that: include: A hybrid system, the hybrid system comprising a power battery, an engine and a motor, wherein the power battery provides electrical energy for the motor; A gearbox, wherein the power output shaft of the engine is connected to the power input shaft of the gearbox, and the power output shaft of the motor is connected to the power input shaft of the gearbox; An exhaust throttle valve, which is used to adjust the speed of the engine by adjusting the working parameters of the exhaust throttle valve; and A controller, wherein the controller is used to execute the gear shift assist control method described in any one of claims 1 to 9.

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