A shift-assist control method for a hybrid vehicle, a hybrid vehicle

Abstract

The application provides a shift assisting control method of a hybrid vehicle and the hybrid vehicle, and solves the technical problems of energy waste caused by long shift time of the hybrid vehicle in the prior art and shift failure caused by motor failure. The application provides a shift assisting control method of a hybrid vehicle and the hybrid vehicle, the speed of the power input shaft of the gearbox is regulated by regulating the opening of the exhaust throttle valve and / or the valve closing rate, so that the speed of the power input shaft of the gearbox is consistent with the speed of the power output shaft of the gearbox, thereby assisting the shift of the hybrid assembly to realize quick shift, reducing the shift time during the shift, effectively reducing the energy waste caused by long shift time of the hybrid gearbox, and when the motor is used as the drive, even if the motor fails, the shift can still be completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle control, in particular to a shift assisting control method of a hybrid vehicle and the hybrid vehicle. BACKGROUND

[0002] The hybrid vehicle (i.e. the hybrid electric vehicle) is a vehicle equipped with two or more power sources. The hybrid vehicle has the advantages of high system efficiency, etc. Meanwhile, the hybrid transmission also has multiple gears. The hybrid transmission usually sends a shift instruction to the transmission controller by the vehicle controller, and the transmission controller executes the shift of the hybrid transmission according to the shift instruction.

[0003] When the hybrid transmission shifts normally, the shift can be realized by the speed regulation of the motor or the speed regulation of the engine. If the motor fails when the shift is realized by the speed regulation of the motor, the shift time will be long or even the shift will fail. If the shift is realized by the speed regulation of the engine, the speed regulation (e.g. natural speed reduction) of the engine is slow, which leads to a long shift power interruption time of the hybrid transmission, thereby causing energy waste and other problems. SUMMARY

[0004] Therefore, the present application provides a shift assisting control method of a hybrid vehicle and the hybrid vehicle. The opening degree of the exhaust throttle valve and / or the closing valve rate are regulated to regulate the speed of the power input shaft of the transmission so that the speed of the power input shaft of the transmission is consistent with the speed of the power output shaft of the transmission, thereby assisting the shift of the hybrid assembly to realize fast shift, reducing the shift time during the shift, effectively reducing the energy waste caused by the long shift time of the hybrid transmission, and even if the motor fails when the motor is used as the drive, the shift can still be completed.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme: a shift assisting control method of a hybrid vehicle, characterized in that the hybrid vehicle comprises a hybrid system, an exhaust throttle valve and a transmission, the hybrid system comprises a motor and an engine; wherein the shift assisting control method comprises: obtaining the working mode and the shift mode of the hybrid vehicle; regulating the working parameters of the exhaust throttle valve according to the working mode and the shift mode, so as to regulate the speed of the engine to be consistent with the target 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 closing valve rate of the exhaust throttle valve.

[0006] In an embodiment of the present application, the step of adjusting the working parameter of the exhaust throttle valve according to the working mode and the shift mode comprises: when the current working mode of the hybrid vehicle is the hybrid mode and the shift mode is the upshift mode, obtaining a current state of charge value of the power battery; and when the current state of charge value is greater than a preset state of charge value, adjusting the working parameter of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine, so that the speed of the engine is adjusted to be consistent with the target speed of the power output shaft of the gearbox.

[0007] In an embodiment of the present application, the step of adjusting the working parameter of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine comprises: 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 speed and a target exhaust throttle valve opening degree of the exhaust throttle valve according to the speed difference; adjusting the opening degree of the exhaust throttle valve to be the target exhaust throttle valve opening degree, and adjusting the closing speed of the exhaust throttle valve to be the target exhaust throttle valve closing speed.

[0008] In an embodiment of the present application, the step of adjusting the working parameter of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine further comprises: calculating an exhaust pressure difference value according to the actual exhaust pressure of the exhaust throttle valve and a preset exhaust pressure; calculating an exhaust pressure speed correction coefficient and a first opening degree correction coefficient according to the exhaust pressure difference value; correcting the target exhaust throttle valve closing speed according to the exhaust pressure speed correction coefficient; correcting the target exhaust throttle valve opening degree according to the first opening degree correction coefficient; adjusting the opening degree of the exhaust throttle valve to be the corrected target exhaust throttle valve opening degree, and adjusting the closing speed of the exhaust throttle valve to be the corrected target exhaust throttle valve closing speed.

[0009] In an embodiment of the present application, the step of adjusting the working parameter of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine further comprises: determining a second opening degree correction coefficient of the exhaust throttle valve according to the actual aftertreatment temperature of the exhaust throttle valve; calculating a comprehensive opening degree correction coefficient of the exhaust throttle valve according to the second opening degree correction coefficient and the first opening degree correction coefficient; correcting the target exhaust throttle valve opening degree according to the comprehensive opening degree correction coefficient; and adjusting the opening degree of the exhaust throttle valve to be the target exhaust throttle valve opening degree corrected by the comprehensive opening degree correction coefficient.

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

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

[0012] In an embodiment of the present application, the regulating the working parameter of the exhaust throttle valve according to the working mode and the shift mode comprises: when the current working mode of the hybrid vehicle is the hybrid mode and the downshift mode, regulating 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, regulating the opening degree of the exhaust throttle valve to 100% to regulate the engine speed to be consistent with the target speed of the power output shaft of the gearbox.

[0013] In an embodiment of the present application, the regulating the working parameter of the exhaust throttle valve according to the working mode and the shift mode comprises: when the current working mode of the hybrid vehicle is the pure engine mode and the shift mode is the upshift mode, regulating the working parameter of the exhaust throttle valve according to the actual engine speed and the target engine speed to regulate the engine speed to be consistent with the target speed of the power output shaft of the gearbox.

[0014] As a second aspect of the present application, the present application further provides a hybrid vehicle, comprising: a hybrid system, the hybrid system comprising a power battery, an engine and a motor, wherein the power battery provides electric energy for the motor; a gearbox, a power output shaft of the engine being connected to a power input shaft of the gearbox, and a power output shaft of the motor being connected to the power input shaft of the gearbox; an exhaust throttle valve, the working parameter of the exhaust throttle valve being regulated to regulate the engine speed; and a controller, the controller being configured to execute the shift assistance control method described above.

[0015] The shift assistance control method and the hybrid vehicle provided by the present application regulate the engine speed by regulating the opening degree and / or the closing speed of the exhaust throttle valve, regulate the speed of the power input shaft of the gearbox to make the speed of the power input shaft of the gearbox consistent with the speed of the power output shaft of the gearbox, thereby assisting the shift of the hybrid assembly to achieve fast shift and reduce the shift time during the shift, effectively reducing the energy waste caused by the long shift time of the hybrid gearbox, and when the motor is used as the drive, even if the motor fails, the shift can still be completed, further improving the power stability of the hybrid vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only need to be the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0017] Figure 1 A working principle diagram of a hybrid vehicle is provided for the embodiments of the present application.

[0018] Figure 2 A flowchart of a shift assisting control method of a hybrid vehicle is provided for the embodiments of the present application.

[0019] Figure 3 A flowchart of a shift assisting control method of a hybrid vehicle is provided for another embodiment of the present application.

[0020] Figure 4 A flowchart of a shift assisting control method of a hybrid vehicle is provided for another embodiment of the present application.

[0021] Figure 5 A flowchart of a shift assisting control method of a hybrid vehicle is provided for another embodiment of the present application.

[0022] Figure 6 A flowchart of a shift assisting control method of a hybrid vehicle is provided for another embodiment of the present application.

[0023] Figure 7 A flowchart of a shift assisting control method of a hybrid vehicle is provided for another embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solutions of the embodiments of the present application are suitable for the application scenarios of shift control of a hybrid vehicle. The hybrid vehicle can be a passenger car or a commercial vehicle. Figure 1 A working principle diagram of a hybrid vehicle is provided for the embodiments of the present application, as shown in Figure 1 As shown, the hybrid vehicle includes:

[0025] A hybrid system 100, the hybrid system 100 includes a power battery 101, an engine 103 and a motor 102, wherein the power battery 101 provides power for the motor 102. The engine 103 realizes fuel driving of the hybrid vehicle, and the power battery 101 and the motor 102 realize electric driving of the hybrid vehicle.

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

[0027] The exhaust throttle valve 300 adjusts the rotating speed of the engine 103 by changing the throttle section or the throttle length to control the fluid flow.

[0028] When the hybrid vehicle needs to shift gears, if the working mode of the hybrid vehicle is the hybrid mode, that is, the motor is used as the drive, the gear shifting can be realized by adjusting the rotating speed of the motor. For example, when the gear is shifted up, the motor applies a negative torque on the input shaft to quickly reduce the rotating speed, and when the gear is shifted down, the motor applies a positive torque on the input shaft to quickly increase the rotating speed. However, when the motor fails, the engine automatically reduces the rotating speed to realize the gear shifting. However, the engine automatically reduces the rotating speed slowly, resulting in a long gear shifting time, and even the problem of gear shifting failure. In order to improve the gear shifting rate, the engine cylinder braking can be used to realize the fast gear shifting. However, many engines, especially small displacement engines, are not equipped with cylinder braking, and the cylinder braking is only applicable to engine driving and is not applicable to motor driving. Therefore, the applicability of the cylinder braking to realize the fast gear shifting is small.

[0029] Based on the above technical status, the present application provides a method for assisting the gear shifting of a hybrid vehicle, which can be used to adjust the rotating speed of the engine by adjusting the working parameters (such as the opening of the exhaust throttle valve and / or the closing rate of the exhaust throttle valve) of the exhaust throttle valve, so as to adjust the rotating speed of the power input shaft of the gearbox, 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, the gear shifting can be completed more quickly, and the energy waste and other problems are reduced. In addition, when the motor is used as the drive, even if the motor fails, the gear shifting can still be completed, and the power stability of the hybrid vehicle is further improved.

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0031] As a first aspect of the present application, the present application provides a gear shifting auxiliary control method for a hybrid vehicle, Figure 2Fig. 1 shows a schematic diagram of a shift assist control method of a hybrid vehicle according to an embodiment of the present application. Figure 2 The shift assist control method of the hybrid vehicle comprises the following steps:

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

[0033] Specifically, the working mode comprises a hybrid mode and a pure engine mode. The hybrid mode refers to the cooperation of the motor and the engine as the drive. The pure engine mode refers to only the engine as the drive.

[0034] The shift mode comprises an upshift mode and a downshift mode. The upshift mode refers to that the target gear position corresponds to a higher vehicle speed than the current gear position. The downshift mode refers to that the target gear position corresponds to a lower vehicle speed than the current gear position.

[0035] S2: adjusting the working parameter of the exhaust throttle valve according to the working mode and the shift mode, so as to adjust the engine speed to be consistent with the target speed of the power output shaft of the gearbox.

[0036] The working parameter comprises the opening degree of the exhaust throttle valve and / or the closing rate of the exhaust throttle valve.

[0037] When the hybrid vehicle needs to shift during operation, the target gear position is determined, and then the target speed of the hybrid vehicle can be determined according to the target gear position. The target speed of the power output shaft of the gearbox can be calculated according to the target speed of the hybrid vehicle and the transmission ratio between the power output shaft of the gearbox and the power input shaft of the driving component.

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

[0039] Since the working mode and the shift mode during the vehicle driving process can be different, the working parameters (opening degree and / or closing rate) of the exhaust throttle valve are regulated according to different working modes and different shift modes to regulate the engine speed, so as to regulate the speed of the power input shaft of the gearbox to make the speed of the power input shaft consistent with the target speed of the power output shaft of the gearbox, so that the shift can be quickly completed. For example, when the working mode is the pure engine mode and the shift mode is the downshift mode, the opening degree of the exhaust throttle valve can be regulated to 100%, i.e., the exhaust throttle valve is fully opened, to regulate the engine speed, so as to regulate the speed of the power input shaft of the gearbox to be consistent with the target speed of the power output shaft of the gearbox.

[0040] The application provides a shift assisting control method of a hybrid vehicle and a hybrid vehicle. The working parameters (opening degree and / or closing rate) of the exhaust throttle valve are regulated to regulate the engine speed, so as to regulate the speed of the power input shaft of the gearbox to make the speed of the power input shaft consistent with the speed of the power output shaft of the gearbox, thereby assisting the shift of the hybrid assembly to achieve quick shift, reducing the shift time during the shift process, effectively reducing the energy waste caused by the long shift time of the hybrid gearbox, and when the motor is used as the drive, the shift can still be completed even if the motor fails, further improving the power stability of the hybrid vehicle.

[0041] In an embodiment of the application, as shown in Figure 3 When the working mode of the hybrid vehicle is the hybrid mode, the specific regulation mode of the working parameters of the exhaust throttle valve, i.e., S2 (regulating the working parameters of the exhaust throttle valve according to the working mode and the shift mode), specifically includes the following steps:

[0042] S20: When the current working mode of the hybrid vehicle is the hybrid mode and the shift mode is the upshift mode, the current state of charge value of the power battery is obtained.

[0043] When it is determined that the working mode of the hybrid vehicle is the hybrid mode, i.e., the motor and the engine cooperate as the drive. When the hybrid vehicle operates in the hybrid mode, the motor normally works, 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 shift mode is the downshift mode, the opening degree of the exhaust throttle valve is regulated to 100%, i.e., S24 is executed. When the working mode is the hybrid mode and the shift mode is the downshift mode, the opening degree of the exhaust throttle valve is regulated to 100% regardless of whether the current state of charge value of the power battery is greater than the preset state of charge value, so as to reduce the energy consumption when the speed of the motor is adjusted.

[0045] S22: It is judged whether the current state of charge value is greater than the preset state of charge value.

[0046] When the vehicle is moving in the 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 determination result of S22 is yes, i.e., 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 determination result of S22 is no, i.e., 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: The working parameter of the exhaust throttle valve is regulated according to the actual speed of the engine and the target speed of the engine, so that the speed of the engine is consistent with the target speed of the power output shaft of the gearbox.

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

[0050] S24: The opening degree of the exhaust throttle valve is regulated 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 regulated to 100%. That is, when the state of charge value of the power battery is low, the exhaust throttle valve is fully opened, and the engine tries to reduce the braking power to allow the motor to recover more energy.

[0052] Optionally, as shown in Figure 4 S23 (regulating the working parameter 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: The speed difference is calculated 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 gearbox, the transmission ratio between the power input shaft of the gearbox and the power output shaft of the gearbox, and the transmission ratio between the power input shaft of the gearbox and the power output shaft of the engine.

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

[0056] S232: The target closing rate of the exhaust throttle valve and the target opening degree of the exhaust throttle valve are calculated according to the speed difference.

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

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

[0059] Specifically, when the speed difference is large, the target exhaust throttle valve closes at a large rate and the target exhaust throttle valve opens at a small degree. That is, while quickly closing the exhaust throttle valve, the opening of the exhaust throttle valve should be as small as possible, which can accelerate the speed reduction rate.

[0060] When the speed difference is small, the target exhaust throttle valve closes at a smaller rate and opens at a larger degree. That is, when the speed difference is small, the exhaust throttle valve closes slowly while the exhaust regulating valve opens more, reducing noise, vibration and harshness on the vehicle.

[0061] S233: Adjust the opening degree of the exhaust throttle valve to the target exhaust throttle valve opening degree, and adjust the closing rate of the exhaust throttle valve to the target exhaust throttle valve closing rate.

[0062] Optional, such as Figure 5 As shown, after S232 (calculating the target exhaust throttle valve closing rate and target exhaust throttle valve opening based on the speed difference), S23 (adjusting the operating parameters of the exhaust throttle valve based on the actual engine speed and the target engine speed) 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, the actual exhaust pressure is recorded 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 means that the exhaust throttle valve can work normally and S235 is executed.

[0066] When the judgment result of S234 is negative, 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 malfunctioned. At this time, throttle valve fault information is generated, that is, S2390 is executed.

[0067] S235: Calculate the pressure difference based on 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 according to the exhaust pressure curve of the exhaust throttle valve and the actual engine speed.

[0069] S236: calculating an exhaust pressure speed regulation correction coefficient and a 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, and therefore the exhaust throttle valve closing speed calculated in S232 needs to be corrected and the target exhaust throttle valve opening needs to be corrected to reduce the probability of failure of the exhaust throttle valve due to changes in 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 empirically, 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 updated iteratively through deep learning. Thus, the speed regulation correction coefficient matched with the exhaust pressure difference can be found in the speed regulation correction coefficient database.

[0072] Similarly, the relationship between the first opening correction coefficient and the exhaust pressure difference can also be obtained empirically, 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 updated iteratively through deep learning. Thus, the first opening correction coefficient matched with the exhaust pressure difference can be found in the opening correction coefficient database.

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

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

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

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

[0077] S239: regulating the opening of the exhaust throttle valve to be the corrected target exhaust throttle valve opening, and regulating the closing speed of the exhaust throttle valve to be the corrected target exhaust throttle valve closing speed.

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

[0079] S390: Generate throttle valve fault information.

[0080] Optional, such as Figure 6 As shown, after S236 (calculating the exhaust pressure speed regulation correction coefficient and the first opening correction coefficient based on the exhaust pressure difference), S23 (adjusting the operating parameters of the exhaust throttle valve based on the actual engine speed and the engine target speed) further includes the following steps:

[0081] S2361: Determine the second opening correction coefficient of the exhaust throttle valve based on the actual after-treatment temperature of the exhaust throttle valve;

[0082] The actual after-treatment temperature of the exhaust throttle valve is monitored in real time. When the actual after-treatment temperature is low, the opening of the exhaust throttle valve is correspondingly smaller. Therefore, when the actual after-treatment temperature changes, the opening of the exhaust throttle valve also needs to be corrected accordingly. Thus, a second opening correction coefficient needs to be determined based on the actual after-treatment temperature.

[0083] Specifically, the relationship between the actual aftertreatment temperature of the exhaust throttle valve and the corresponding second opening correction coefficient can also be derived empirically. For example, an opening coefficient database can be constructed, storing the aftertreatment temperature and its corresponding opening correction coefficient. This database can be continuously updated and iterated using deep learning. In this way, the matching second opening correction coefficient can be found in the opening correction coefficient database based on the actual aftertreatment temperature.

[0084] S2362: Calculate the comprehensive opening correction factor of the exhaust throttle valve based on the second opening correction factor and the first opening correction factor;

[0085] Once the second opening correction factor is determined, the first opening correction factor and the second opening correction factor can be multiplied together to calculate the overall opening correction factor of the exhaust throttle valve.

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

[0087] S2364: The opening degree of the exhaust throttle valve is adjusted to the target exhaust throttle valve opening degree after being corrected by the comprehensive opening degree correction coefficient.

[0088] Once the overall opening correction coefficient is calculated, the target exhaust throttle valve opening can be corrected according to the overall 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 shown in Figure 7 the specific regulating manner of the working parameter of the exhaust throttle valve when the working mode of the hybrid vehicle is the pure engine mode, i.e. S2 (regulating the working parameter of the exhaust throttle valve according to the working mode and the shift mode), specifically comprises the following steps:

[0090] S25: when the current working mode of the hybrid vehicle is the pure engine mode and the shift mode is the downshift mode, regulating the opening degree of the exhaust throttle valve to be 100%, i.e. performing S24, to regulate the rotation speed of the power input shaft of the gearbox to be consistent with the target rotation speed of the power output shaft of the gearbox.

[0091] S26: when the current working mode of the hybrid vehicle is the pure engine mode and the shift mode is the upshift mode, regulating the working parameter of the exhaust throttle valve according to the actual rotation speed of the engine and the target rotation speed of the engine, so that the regulated rotation speed is consistent with the target rotation speed of the power output shaft of the gearbox, i.e. performing S23.

[0092] As a second aspect of the present application, the present application also provides a controller, which is in communication connection with the exhaust throttle valve in the Figure 1 and the pressure sensor for detecting the actual exhaust pressure of the exhaust throttle valve, the temperature sensor for detecting the aftertreatment temperature of the exhaust throttle valve, the exhaust throttle valve, and the speed sensor for detecting the engine rotation speed, to perform the steps in the shift assist control method described above.

[0093] The method in the present application can be realized by software, hardware, firmware or any combination thereof, in whole or in part. When realized by software, it can be realized 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, which, when loaded and executed on a computer, perform the processes or functions described in the present application 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 equipment, 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 to perform the operations of the embodiments of the present application, including object-oriented programming languages such as Java, C++, etc., and conventional procedural programming languages such as "C" language or similar programming languages. The program code can be executed entirely on a user computing device, partially on a user device, as an independent software package, partially on a 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 or transferred from one computer-readable medium to another computer-readable medium, e.g., from one website, computer, server or data center to another website, computer, server or data center, through wired or wireless ways. The computer-readable medium can be any available medium accessible by the computer or data storage device such as a server, data center, etc. integrated with one or more available media. The available medium can be a magnetic medium, e.g., a floppy disk, a hard disk, a magnetic tape; an optical medium, e.g., a digital video disc; or a semiconductor medium, e.g., a solid state disk. The computer-readable medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0096] In addition, the embodiments of the present application can also be storage media having computer programs stored thereon, and the computer programs are executed by a processor to perform the steps of the shift assisting control method described in any of the embodiments of the present application.

[0097] For each of the foregoing method embodiments, in order to simply describe, each is expressed as a combination of a series of actions, but those skilled in the art should know that the present application is not limited to the order of the actions described, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

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

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

[0100] Those skilled in the art will further appreciate that the units and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various examples have been described herein in terms of their functionality, their composition, and their manner of operation. Whether such functionality is implemented in hardware or software depends on the particular application and design constraints imposed on the overall system. Skilled persons can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

[0101] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0102] Finally, it should be noted that the terms "first", "second", and the like, herein do not denote any order, quantity, combination, or importance, but rather are used to distinguish one element from another, and are more especially used for the purpose of identification in claims. In addition, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, no element is essential unless the specification directly states otherwise.

[0103] The above description of disclosed embodiments provides enabling disclosure sufficient for others to practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for shift assist control in a hybrid vehicle, characterized in that, The hybrid vehicle includes a hybrid system, an exhaust throttle valve, and a transmission; the hybrid system includes an electric motor and an engine. The shift assist control method includes: Obtain the operating mode and shifting mode of the hybrid vehicle; The working parameters of the exhaust throttle valve are adjusted according to the working mode and the shifting mode to adjust the engine speed to match the target speed of the power output shaft of the transmission. The operating parameters include the opening degree of the exhaust throttle valve and / or the closing rate of the exhaust throttle valve; The method of adjusting 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 hybrid mode and the shift mode is upshift mode, the current state of charge value of the power battery is obtained. When the current state of charge value is greater than the preset state of charge value, the operating parameters of the exhaust throttle valve are adjusted 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.

2. The shift assist control method according to claim 1, characterized in that, The step of adjusting the operating parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine includes: Calculate the speed difference based on the actual engine speed and the engine target speed; The target exhaust throttle valve closing rate and target exhaust throttle valve opening degree are calculated based on the speed difference. The opening degree of the exhaust throttle valve is adjusted to the target exhaust throttle valve opening degree, and the closing rate of the exhaust throttle valve is adjusted to the target exhaust throttle valve closing rate.

3. The shift assist control method according to claim 2, characterized in that, The method of adjusting the operating parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine also includes: Calculate the pressure difference based on the actual exhaust pressure and the preset exhaust pressure of the exhaust throttle valve; Calculate the pressure discharge speed regulation correction coefficient and the first opening correction coefficient based on the pressure discharge difference; The target exhaust throttle valve closing rate is corrected according to the exhaust pressure regulation speed correction coefficient; The target exhaust throttle valve opening is corrected according to the first opening correction coefficient; The opening degree of the exhaust throttle valve is adjusted to the corrected target exhaust throttle valve opening degree, and the closing rate of the exhaust throttle valve is adjusted to the corrected target exhaust throttle valve closing rate.

4. The shift assist control method according to claim 3, characterized in that, The method of adjusting the operating parameters of the exhaust throttle valve according to the actual speed of the engine and the target speed of the engine also includes: The second opening correction coefficient of the exhaust throttle valve is determined based on the actual after-treatment temperature of the exhaust throttle valve. The comprehensive opening correction factor of the exhaust throttle valve is calculated based on the second opening correction factor and the first opening correction factor; The target exhaust throttle valve opening is corrected according to the comprehensive opening correction coefficient; The opening degree of the exhaust throttle valve is adjusted to the target exhaust throttle valve opening degree after being corrected by the comprehensive opening degree correction coefficient.

5. The shift assist control method according to claim 1, characterized in that, The shift assist control method further includes: When the actual exhaust pressure of the exhaust throttle valve is less than the preset exhaust pressure fault threshold, a throttle valve fault information is generated.

6. The shift assist control method according to claim 1, 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%.

7. The shift assist control method according to claim 1, characterized in that, The method of adjusting 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 hybrid mode and downshifting mode, the opening of the exhaust throttle valve is adjusted to 100%; or When the current operating mode of the hybrid vehicle is pure engine mode and the shift mode is downshift mode, the opening of the exhaust throttle valve is adjusted to 100% to adjust the engine speed to match the target speed of the power output shaft of the transmission.

8. The shift assist control method according to claim 1, characterized in that, The method of adjusting 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 pure engine mode and the shift mode is upshift mode, the operating parameters of the exhaust throttle valve are adjusted 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.

9. A hybrid vehicle, characterized in that, include: A hybrid system, comprising a power battery, an engine, and a motor, wherein the power battery provides electrical energy to the motor; The transmission includes an engine output shaft connected to a transmission input shaft and an electric motor output shaft connected to a transmission input shaft. An exhaust throttle valve, used to regulate the engine speed by adjusting its operating parameters; and A controller, the controller being used to execute the shift assist control method according to any one of claims 1-8.

Images