Gear shifting control method and device of vehicle, vehicle, medium and program product

Abstract

The invention relates to the technical field of vehicles, in particular to a gear shifting control method and device of a vehicle, the vehicle, a medium and a program product.The method comprises the steps that whether the current vehicle meets a preset motor speed regulation condition or not is judged; if the current vehicle meets the preset motor speed regulation condition, the current oil pressure is regulated to the target oil pressure corresponding to the clutch combination point based on a first preset regulation strategy, and the generator speed regulation torque and the rotating speed difference value needing to be synchronized of the current vehicle are obtained; and rotating speed adjustment is conducted according to the generator speed regulation torque and the rotating speed difference value needing to be synchronized, and when rotating speed adjustment is completed and the current vehicle meets the direct drive entering condition, the target oil pressure is adjusted to the locking oil pressure based on a second preset adjustment strategy, so that the gear shifting action is completed. Therefore, the gear shifting time is shortened by entering the gear shifting speed regulation stage in advance, the problem that the dynamic property of the automobile is affected due to the long gear shifting process is solved, and the dynamic property of the automobile is improved when acceleration is needed.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle shift control method, device, vehicle, medium and program product. Background Art

[0002] With the rapid growth of automobiles, tremendous pressure is being put on the environment and resources. Non-renewable energy is decreasing day by day. Hybrid vehicles have become an important direction of current automobile development.

[0003] In the related art, during the gear shifting process of motor speed regulation, the vehicle generally shifts gears according to a preset gear shift speed synchronization line.

[0004] However, in the related technology, the motor speed is only adjusted when the gear switching process reaches the optimal shift line, which easily loses the optimal shifting timing and greatly affects the power of the car; and the motor speed adjustment during the shifting process will lower the engine speed. The gear shift is completed after missing the optimal shifting timing, which affects the rapid increase of the engine speed and torque, resulting in the inability to maximize the use of the engine capacity after entering direct drive, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a vehicle shift control method, device, vehicle, medium and program product to solve the problem that the long gear shift process affects the power of the vehicle, and improve the power of the vehicle when acceleration is required.

[0006] A first aspect of the present application provides a vehicle shift control method, comprising the following steps:

[0007] Determine whether the current vehicle meets the preset motor speed regulation conditions;

[0008] If the current vehicle meets the preset motor speed regulation condition, the current oil pressure is regulated to the target oil pressure corresponding to the clutch engagement point based on the first preset regulation strategy, and the generator speed regulation torque and the required synchronous speed difference of the current vehicle are obtained;

[0009] The speed is adjusted according to the generator speed regulation torque and the required synchronous speed difference, and when the speed adjustment is completed and the current vehicle meets the direct drive conditions, the target oil pressure is adjusted to the locking oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

[0010] Optionally, the determining whether the current vehicle meets a preset motor speed regulation condition includes:

[0011] Obtaining the current throttle opening, current gear switching information, peak discharge power of the power battery, and required power of the entire vehicle;

[0012] If the current throttle opening is in a preset opening range, and the vehicle demand power is less than the peak allowable discharge power of the power battery, and the current gear switching information meets the preset switching conditions, it is determined that the current vehicle meets the preset motor speed regulation conditions.

[0013] Optionally, the speed regulation according to the generator speed regulation torque and the required synchronous speed difference includes:

[0014] Determining whether the generator speed regulating torque is greater than or equal to a preset speed regulating torque limit;

[0015] If the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, the speed is adjusted according to the first speed regulation torque based on the preset maximum speed regulation time, the target oil pressure and the required synchronous speed difference, wherein the first speed regulation torque is less than the preset speed regulation torque limit.

[0016] Optionally, after determining whether the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, the method further includes:

[0017] If the generator speed regulating torque is less than the preset speed regulating torque limit, determining whether there is a request to exit the gear shift speed regulating;

[0018] If the exit shift speed regulation request does not exist, the torque change slope of the clutch is calculated, and the speed is regulated based on the preset maximum speed regulation time and the torque change slope of the clutch.

[0019] Optionally, after the speed adjustment is completed, the method further includes:

[0020] Obtaining the actual vehicle speed and actual wheel-end torque of the current vehicle;

[0021] If the actual vehicle speed is greater than the minimum vehicle speed corresponding to the direct drive condition, and the actual wheel-end torque is less than the minimum torque corresponding to the direct drive condition, it is determined that the current vehicle meets the direct drive condition.

[0022] A second aspect of the present application provides a vehicle shift control device, comprising:

[0023] A judgment module is used to judge whether the current vehicle meets the preset motor speed regulation conditions;

[0024] an acquisition module, configured to adjust the current oil pressure to a target oil pressure corresponding to a clutch engagement point based on a first preset adjustment strategy if the current vehicle meets the preset motor speed regulation condition, and to obtain a generator speed regulation torque and a required synchronous speed difference of the current vehicle;

[0025] The control module is used to adjust the speed according to the generator speed regulation torque and the required synchronous speed difference, and when the speed adjustment is completed and the current vehicle meets the direct drive condition, adjust the target oil pressure to the locking oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

[0026] Optionally, the judging module is specifically configured to:

[0027] Obtaining the current throttle opening, current gear switching information, peak discharge power of the power battery, and required power of the entire vehicle;

[0028] If the current throttle opening is in a preset opening range, and the vehicle demand power is less than the peak allowable discharge power of the power battery, and the current gear switching information meets the preset switching conditions, it is determined that the current vehicle meets the preset motor speed regulation conditions.

[0029] Optionally, the judging module is specifically configured to:

[0030] Determining whether the generator speed regulating torque is greater than or equal to a preset speed regulating torque limit;

[0031] If the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, the speed is adjusted according to the first speed regulation torque based on the preset maximum speed regulation time, the target oil pressure and the required synchronous speed difference, wherein the first speed regulation torque is less than the preset speed regulation torque limit.

[0032] Optionally, after determining whether the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, the determination module is further configured to:

[0033] If the generator speed regulating torque is less than the preset speed regulating torque limit, determining whether there is a request to exit the gear shift speed regulating;

[0034] If the exit shift speed regulation request does not exist, the torque change slope of the clutch is calculated, and the speed is regulated based on the preset maximum speed regulation time and the torque change slope of the clutch.

[0035] Optionally, after the speed adjustment is completed, the judgment module is further used to:

[0036] Obtaining the actual vehicle speed and actual wheel-end torque of the current vehicle;

[0037] If the actual vehicle speed is greater than the minimum vehicle speed corresponding to the direct drive condition, and the actual wheel-end torque is less than the minimum torque corresponding to the direct drive condition, it is determined that the current vehicle meets the direct drive condition.

[0038] A third aspect of the present application provides a vehicle, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being configured to execute the vehicle shift control method as described in the above embodiment.

[0039] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the vehicle shift control method as described in the above embodiment.

[0040] A fifth aspect of the present application provides a computer program product, which stores a computer program that, when executed by a processor, implements the vehicle shift control method as described in the above embodiments.

[0041] Therefore, after judging that the current vehicle meets the preset motor speed regulation conditions, the embodiment of the present application can adjust the oil pressure to the target oil pressure corresponding to the clutch engagement point according to the first preset regulation strategy, and obtain the generator speed regulation torque and the speed difference required to be synchronized at this time, and then adjust the speed. When the speed regulation is completed and the vehicle meets the conditions for entering the direct drive mode, the target oil pressure is adjusted to the locking oil pressure according to the second preset regulation strategy to complete the gear shifting action. Therefore, by entering the gear shifting speed regulation stage in advance to shorten the gear shifting time, the problem of the long gear switching process affecting the power of the car is solved, and the power of the car is improved when acceleration is required.

[0042] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0044] Figure 1 A flow chart of a vehicle shift control method provided according to an embodiment of the present application;

[0045] Figure 2 A schematic diagram of a vehicle shift control method according to an embodiment of the present application;

[0046] Figure 3 A schematic diagram of a process of a conventional vehicle shift control method provided according to an embodiment of the present application;

[0047] Figure 4 is a schematic diagram of a gear shift speed synchronization line according to an embodiment of the present application;

[0048] Figure 5 A schematic diagram of curves of the oil filling stage, the speed regulation stage and the locking stage during the gear shifting process according to a specific embodiment of the present application;

[0049] Figure 6 A flow chart of a vehicle shift control method provided according to an embodiment of the present application;

[0050] Figure 7 A schematic diagram of a vehicle shift control device provided according to an embodiment of the present application;

[0051] Figure 8 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0053] The following describes the vehicle shift control method, device, vehicle, medium and program product according to the embodiments of the present application with reference to the accompanying drawings.

[0054] Before introducing the vehicle shift control method according to the embodiment of the present application, the background of the vehicle shift control method according to the present application and the vehicle shift control method in the related art are briefly introduced.

[0055] Specifically, Figure 2 As shown in (a), Figure 2 (a) is a schematic diagram of the speed change mechanism developed based on the planetary disk configuration. Brake B realizes the synchronization between the ring gear and the sun gear. The generator EM1 is connected to the ring gear with a certain transmission ratio, and the drive motor EM2 is connected to the planetary carrier with a certain transmission ratio.

[0056] When hybrid vehicles are fully charged and at full throttle, they are subjected to a 100-kilometer acceleration test. The gear mode of the hybrid vehicle will change from pure electric, extended-range to direct drive. When switching from extended-range to direct drive, the motor will perform speed control, and the shift clutch engagement will go through the oil filling stage, speed regulation stage, and locking stage. This process takes a certain amount of time, which will cause the vehicle's power to weaken.

[0057] Furthermore, in order to solve the above problems, the related art generally follows Figure 3 The gear shifting speed synchronization line shown is used for gear shifting, that is, the motor speed is adjusted only when the vehicle reaches the optimal gear shifting line.

[0058] However, during the gear shifting process with motor speed regulation, when the hybrid vehicle has sufficient power and is at full throttle, the clutch will go through the oil filling stage, speed regulation stage, and locking stage at the best gear shifting time. The sequential execution of these three stages will miss the best gear shifting time, resulting in a longer gear switching process, which greatly affects the vehicle's power. In addition, during the gear shifting process, the motor speed regulation will lower the engine speed, and the gear shift will be completed after missing the best gear shifting time, affecting the rapid increase of engine speed and torque, resulting in the inability to maximize the engine capacity after entering direct drive.

[0059] Based on the above defects, the present application proposes a vehicle shift control method. The shift process of the present application can be Figure 2 In the configuration shown in (b), the range extender enters the direct drive process, and the clutch is controlled to enter the first two stages in advance to reduce the shifting time and further improve the vehicle's power.

[0060] Specifically, Figure 1 A schematic flow chart of a vehicle shift control method provided in an embodiment of the present application.

[0061] like Figure 1 As shown, the vehicle shift control method includes the following steps:

[0062] In step S101, it is determined whether the current vehicle meets the preset motor speed regulation conditions.

[0063] Among them, the motor speed regulation condition refers to the specific conditions that determine whether the motor speed regulation process needs to be started in the gear shift control, ensuring that under specific driving conditions, the advantages of the motor can be effectively utilized to perform fast gear shifting, thereby improving the vehicle's power performance.

[0064] Specifically, the embodiment of the present application collects and analyzes multiple key parameters to obtain relevant information of the current vehicle to determine whether the current vehicle meets the preset motor speed regulation conditions. If all conditions are met, it can be determined that the current vehicle meets the preset motor speed regulation conditions, and corresponding motor speed regulation measures can be taken.

[0065] Optionally, in some embodiments, determining whether the current vehicle meets the preset motor speed regulation conditions includes: obtaining the current throttle opening, current gear switching information, peak discharge power of the power battery, and vehicle power demand of the current vehicle; if the current throttle opening is in a preset opening range, and the vehicle power demand is less than the peak allowable discharge power of the power battery, and the current gear switching information meets the preset switching conditions, then it is determined that the current vehicle meets the preset motor speed regulation conditions.

[0066] Among them, the preset opening range means that when the vehicle's throttle opening is within this preset range, the embodiment of the present application will determine that the driver has a need to accelerate, and the vehicle has the possibility of entering the motor speed regulation condition. In practical applications, the preset opening range can be pre-set by the user, can be obtained through a limited number of experiments, or can be obtained through a limited number of computer simulations, which is not specifically limited here. The preset switching condition refers to the specific standard used to determine whether the motor speed regulation process should be started in the shift control method.

[0067] It can be understood that obtaining the current throttle opening of the vehicle, that is, detecting the degree of the driver's operation of the throttle, is used to determine the driver's acceleration intention; obtaining the current gear switching information of the vehicle, that is, checking the current gear of the vehicle and whether there is a need to shift up or down; obtaining the peak discharge power of the vehicle's power battery, that is, real-time monitoring of the maximum discharge capacity of the power battery to evaluate whether the battery can support the current power demand; obtaining the vehicle's vehicle power demand, and calculating the required total power according to the vehicle's current operating conditions (such as speed, load, etc.). If the current throttle opening is within the preset opening range, it means that the driver is performing an acceleration operation; if the vehicle's power demand is less than the peak allowable discharge power of the power battery, it means that the battery is capable of providing power support; the current gear switching information must meet the preset switching conditions, such as the current vehicle is in a certain gear and there is a need to shift up. If all of the above conditions are met, the embodiment of the present application can determine that the current vehicle meets the preset motor speed regulation conditions, and corresponding motor speed regulation measures can be taken.

[0068] For example, assuming that the preset opening range is [90%, 100%], if the current throttle opening is 95%, the vehicle demand power is 100kw, the peak allowable discharge power of the power battery is 200kw, and the current gear switching information is switching from the second gear to the third gear, since the current throttle opening of 95% is in the preset opening range [90%, 100%], and the vehicle demand power of 100kw is less than the peak allowable discharge power of the power battery of 200kw, and the switching from the second gear to the third gear meets the preset switching conditions, it is determined that the current vehicle meets the preset motor speed regulation conditions.

[0069] In step S102, if the current vehicle meets the preset motor speed regulation conditions, the current oil pressure is adjusted to the target oil pressure corresponding to the clutch engagement point based on the first preset regulation strategy, and the generator speed regulation torque of the current vehicle and the required synchronous speed difference are obtained.

[0070] Among them, the first preset adjustment strategy refers to a strategy for controlling the oil pressure to the target oil pressure corresponding to the clutch engagement point during the hybrid vehicle shifting process, and the main purpose is to quickly establish the oil pressure to the oil pressure level corresponding to the so-called "kisspoint" point, so that the clutch can quickly reach the critical point of torque transmission. The target oil pressure refers to the specific oil pressure level that needs to be reached during the hybrid vehicle shifting process in order for the clutch to smoothly transmit torque; the target oil pressure can be pre-set by the user, can be obtained through a limited number of experiments, or can be obtained through a limited number of computer simulations, and is not specifically limited here. The motor speed adjustment torque (Tq_EM_Act) refers to the torque required by the motor to adjust the engine speed to match the target gear during the shifting process. The required synchronous speed difference (Δn) refers to the difference between the engine speed and the target gear that needs to be adjusted during the shifting process in order to achieve smooth shifting between the engine and the gearbox. This difference is used to ensure that the engine speed matches the target gear speed, thereby completing the shifting smoothly. Key parameters.

[0071] Specifically, if the current vehicle meets the preset motor speed regulation conditions, the current oil pressure will be adjusted to the target oil pressure corresponding to the clutch engagement point according to the first preset regulation strategy, and the generator speed regulation torque (Tq_EM_Act) of the current vehicle and the speed difference (Δn) to be synchronized are obtained. First, it is necessary to determine whether the current vehicle meets the preset motor speed regulation conditions, which include but are not limited to the current throttle opening being within the preset opening range, the vehicle demand power being less than the peak allowable discharge power of the power battery, and the current gear switching information meeting the preset switching conditions; once it is determined that the vehicle meets the motor speed regulation conditions, the current oil pressure will be adjusted to the target oil pressure corresponding to the clutch engagement point based on the first preset regulation strategy. The target oil pressure refers to the oil pressure level required for the clutch to start transmitting torque, that is, the oil pressure corresponding to the so-called "kisspoint" point; while adjusting the oil pressure, it is also necessary to obtain the generator speed regulation torque (Tq_EM_Act) of the current vehicle and the speed difference (Δn) to be synchronized, in order to ensure that during the gear shift, the gear shift time is reduced by entering the speed regulation stage in advance, thereby improving the power of the hybrid vehicle.

[0072] In step S103, the speed is adjusted according to the generator speed regulation torque and the required synchronous speed difference, and when the speed adjustment is completed and the current vehicle meets the direct drive conditions, the target oil pressure is adjusted to the locking oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

[0073] Among them, direct drive conditions refer to a series of conditions for switching from hybrid mode to engine direct drive mode in a hybrid vehicle. The second preset adjustment strategy refers to a strategy for adjusting the target oil pressure to the locking oil pressure during the locking stage of the hybrid vehicle's gear shifting process. The locking oil pressure refers to the specific oil pressure level that needs to be reached in order for the clutch to transition from the speed regulation stage to the locking stage during the hybrid vehicle's gear shifting process; the locking oil pressure can be pre-set by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations, and is not specifically limited here.

[0074] It should be noted that the motor speed regulating torque is calculated by the embodiment of the present application to ensure that the engine speed can match the requirements of the target gear during the gear shifting process, thereby achieving a smooth gear shifting process. During the gear shifting process, the size of the motor speed regulating torque directly affects the quality of the gear shifting; if the motor speed regulating torque is too large, it may cause unnecessary vibration or impact during the gear shifting process, affecting driving comfort; and if the speed regulating torque is insufficient, it may cause the gear shifting time to be extended, affecting the vehicle's power performance.

[0075] Specifically, the embodiment of the present application performs speed regulation according to the generator speed regulation torque (Tq_EM_Act) and the speed difference (Δn) that needs to be synchronized. The speed regulation torque limit (Tq_EM_limit) is used to ensure the safety and effectiveness of the speed regulation process. If the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, clutch B maintains the oil pressure of the previous stage, and the generator completes the speed synchronization with a torque less than the speed regulation torque limit; if the generator speed regulation torque is less than the preset speed regulation torque limit, the speed regulation process is continued, and the torque change slope of clutch B is calculated to ensure that it will not cause the whole vehicle to shake, and to ensure that the speed synchronization of the speed regulation stage is completed. During the speed regulation process, it is necessary to meet the torque (Tq_B) transmitted by clutch B is less than the input torque divided by the specific gear ratio (Tq_in / k); after completing the above speed regulation, the embodiment of the present application will check whether the current vehicle meets the conditions for entering direct drive. The conditions for entering direct drive include the actual vehicle speed (Vact) being greater than the minimum vehicle speed (Vmin), and the actual wheel-end torque (Tqact) being less than the minimum wheel-end torque (Tqmin); when the vehicle meets the conditions for entering direct drive, the embodiment of the present application will adjust the target oil pressure to the locking oil pressure according to the second preset adjustment strategy, to ensure that the gear shifting action is completed smoothly when the direct drive conditions are met, thereby improving the vehicle's dynamics.

[0076] It should be noted that the torque change of clutch B during the speed regulation stage should not cause the whole vehicle to shake, and it is necessary to ensure that the speed of the speed regulation stage is completed synchronously; the torque change of clutch B during the speed regulation stage should also maintain the consistency of driving feeling before and after gear shifting as much as possible to avoid frustration.

[0077] Optionally, in some embodiments, the speed is adjusted according to the generator speed regulation torque and the required synchronous speed difference, including: determining whether the generator speed regulation torque is greater than or equal to a preset speed regulation torque limit; if the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, then based on the preset maximum speed regulation time, target oil pressure and the required synchronous speed difference, the speed is adjusted according to the first speed regulation torque, wherein the first speed regulation torque is less than the preset speed regulation torque limit.

[0078] Among them, the maximum speed regulation time (Δt) refers to an empirical value or preset time period set in order to complete the speed regulation stage during the gear shifting process; this time period is determined by vehicle calibration, and is intended to ensure that the speed between the engine and the gearbox can be correctly adjusted to the synchronous state during the speed regulation stage; the maximum speed regulation time can be preset by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations, and is not specifically limited here. The first speed regulation torque refers to a smaller speed regulation torque that will be used in the embodiment of the present application to adjust the speed during the gear shifting process when the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit; the first speed regulation torque can be preset by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations, and is not specifically limited here.

[0079] It is understandable that the embodiment of the present application determines whether the current generator speed regulation torque is greater than or equal to the preset speed regulation torque limit. If the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, the embodiment of the present application will use a first speed regulation torque less than the preset speed regulation torque limit to adjust the speed based on the preset maximum speed regulation time, target oil pressure (corresponding to the clutch engagement point) and the required synchronous speed difference. Among them, the first speed regulation torque (Tq_EM_Act1) should be less than the preset speed regulation torque limit to ensure the safety and effectiveness of the speed regulation process.

[0080] Therefore, after judging that the current vehicle meets the preset motor speed regulation conditions, the embodiment of the present application can adjust the oil pressure to the target oil pressure corresponding to the clutch engagement point according to the first preset regulation strategy, and obtain the generator speed regulation torque and the speed difference required to be synchronized at this time, and then adjust the speed. When the speed regulation is completed and the vehicle meets the conditions for entering the direct drive mode, the target oil pressure is adjusted to the locking oil pressure according to the second preset regulation strategy to complete the gear shifting action. Therefore, by entering the gear shifting speed regulation stage in advance to shorten the gear shifting time, the problem of the long gear switching process affecting the power of the car is solved, and the power of the car is improved when acceleration is required.

[0081] Optionally, in some embodiments, after determining whether the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, it also includes: if the generator speed regulation torque is less than the preset speed regulation torque limit, determining whether there is a request to exit the gear shift speed regulation; if there is no request to exit the gear shift speed regulation, calculating the torque change slope of the clutch, and adjusting the speed based on the preset maximum speed regulation time and the torque change slope of the clutch.

[0082] The request to exit the gear shift speed regulation refers to a signal or instruction to stop the current gear shift speed regulation process when the embodiment of the present application detects that certain conditions no longer meet the conditions for continuing the gear shift speed regulation during the gear shift process. The torque change slope (Slope_Tq) refers to the rate at which the clutch torque changes over time during the gear shift process.

[0083] It is understandable that the embodiment of the present application determines whether the generator speed regulating torque is less than the preset speed regulating torque limit; if the generator speed regulating torque is less than the preset speed regulating torque limit, it further determines whether there is a request to exit the gear shift speed regulating; if there is a request to exit the gear shift speed regulating, the current speed regulating process is stopped and no further speed regulation is performed; if there is no request to exit the gear shift speed regulating, the embodiment of the present application will calculate the torque change slope of the clutch (i.e., the rate of change of the clutch torque over time); based on the preset maximum speed regulating time and the calculated clutch torque change slope, the embodiment of the present application performs speed regulation to ensure that the speed synchronization is completed within the specified time. By controlling the torque change slope, the gradual increase or decrease of the clutch transmission torque can be ensured, thereby avoiding sudden torque changes that cause vehicle shaking or frustration; the speed is adjusted based on the preset maximum speed regulating time and the torque change slope of the clutch to ensure that the speed synchronization is completed within the specified time.

[0084] Therefore, by controlling the torque change slope of the clutch, the speed regulation is completed within the preset maximum speed regulation time, the speed regulation time is shortened, the shifting efficiency is improved, the consistency of the driving experience during the shifting process is ensured, the discomfort caused by shifting is avoided, and the user's driving experience is improved.

[0085] Optionally, in some embodiments, after completing the speed adjustment, it also includes: obtaining the actual vehicle speed and actual wheel-end torque of the current vehicle; if the actual vehicle speed is greater than the minimum vehicle speed corresponding to the direct drive condition, and the actual wheel-end torque is less than the minimum torque corresponding to the direct drive condition, then it is determined that the current vehicle meets the direct drive condition.

[0086] Among them, the minimum torque (Tqmin) refers to the minimum threshold of the wheel-end torque set to enable the vehicle to smoothly enter the direct drive mode during the gear shifting process of a hybrid vehicle; this parameter is used to avoid power interruption or unevenness during gear shifting caused by excessive torque; the minimum torque can be pre-set by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations, and no specific limitation is made here.

[0087] It can be understood that the actual vehicle speed (Vact) is obtained, which is the actual driving speed of the current vehicle; the actual wheel-end torque (Tqact) is obtained, which is the torque actually acting on the wheels of the current vehicle. If the actual vehicle speed is greater than the minimum vehicle speed (Vmin), that is, Vact > Vmin, it means that the current speed of the vehicle has exceeded the minimum speed required to enter the direct drive mode; if the actual wheel-end torque is less than the minimum torque (Tqmin), that is, Tqact < Tqmin, it means that the wheel-end torque of the current vehicle has fallen below the minimum torque required to enter the direct drive mode. If the actual vehicle speed of the current vehicle is greater than the minimum vehicle speed corresponding to the direct drive condition and the actual wheel-end torque is less than the minimum torque corresponding to the direct drive condition, it is determined that the current vehicle meets the direct drive condition.

[0088] Thus, by determining when the current vehicle meets the direct drive condition, the best timing for the vehicle to shift gears is ensured, effectively shortening the gear shifting time.

[0089] To facilitate those skilled in the art to further understand the gear shifting control method of the vehicle in the embodiments of the present application, the following will be described in detail with specific embodiments.

[0090] As Figure 4 shown, Figure 4 is a schematic diagram of the gear shifting speed synchronization line of an embodiment of the present application.

[0091] As Figure 5 shown, Figure 5 is a schematic diagram of the curves of the oil filling stage, speed regulation stage, and locking stage during the gear shifting process of a specific embodiment of the present application.

[0092] Combined with Figures 4 to 6 , the gear shifting control method of the vehicle includes the following steps:

[0093] S601: During the driving process of the hybrid vehicle, when the battery is fully charged and there is a need for full-throttle acceleration, the throttle opening, driving gear information, the peak allowable discharge power P _Max_Discharge of the power battery, and the vehicle demand power P _req_pwr are detected in real time. When the throttle opening is 100% and P _req_pwr < P _Max_Discharge , enter the gear shifting stage;

[0094] S602: In the first stage of the gear shift, the oil filling stage quickly builds up the oil pressure to the oil pressure corresponding to the kiss point, so that the clutch quickly reaches the torque transfer point;

[0095] S603: The second stage of the gear shift is the speed regulation stage. The speed regulation stage confirms that the completion time is the empirical value Δt (which needs to be calibrated by the whole vehicle). Check that the synchronous speed difference is Δn at this time. The generator speed regulation torque at this stage is Tq_EM_Act, and the speed regulation torque limit is Tq_EM_limit.

[0096] Case 1: When Tq_EM_Act>Tq_EM_limit, clutch B maintains the oil pressure of the previous stage, and the generator completes the speed synchronization at a speed less than Tq_EM_limit1;

[0097] Case 2: When Tq_EM_Act <Tq _EM_limit Continue to complete this speed regulation process and complete the speed synchronization calculation formula Tq_ EM_Act ;

[0098] Calculate the torque change slope of clutch B, but the following conditions must be met:

[0099] Condition 1: Tq_B <Tq__in / k;

[0100] Condition 2: The torque change of clutch B during the speed regulation phase should not cause the whole vehicle to shake (the whole vehicle needs to be calibrated), and the speed of the speed regulation phase should be synchronized;

[0101] Condition 3: The torque change of clutch B during the speed regulation phase should keep the driving feeling consistent before and after the gear shift as much as possible, and there should be no sense of frustration (needs to be calibrated by the whole vehicle);

[0102] S604: In the third stage of gear shifting, the locking stage, when the vehicle speed and wheel-end torque meet the conditions for entering direct drive, the hydraulic pressure of clutch B rises to the locking hydraulic pressure, and the gear shifting ends.

[0103] Condition 4: Vmin<Vact,Tqmin> Tqact.

[0104] According to the vehicle shift control method proposed in the embodiment of the present application, after judging that the current vehicle meets the preset motor speed regulation conditions, the oil pressure is adjusted to the target oil pressure corresponding to the clutch engagement point according to the first preset regulation strategy, and the generator speed regulation torque and the speed difference required to be synchronized are obtained at this time, and then the speed regulation is performed. When the speed regulation is completed and the vehicle meets the conditions for entering the direct drive mode, the target oil pressure is adjusted to the locking oil pressure according to the second preset regulation strategy to complete the shifting action. Thus, by entering the shifting speed regulation stage in advance to shorten the shifting time, the problem of the long gear switching process affecting the power of the vehicle is solved, and the power of the vehicle is improved when acceleration is required.

[0105] Next, the shift control device for a vehicle proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0106] Figure 7 It is a block diagram of a gear shift control device for a vehicle according to an embodiment of the present application.

[0107] like Figure 7 As shown, the vehicle shift control device 10 includes: a judgment module 100 , an acquisition module 200 and a control module 300 .

[0108] The judging module 100 is used to judge whether the current vehicle meets the preset motor speed regulation conditions;

[0109] The acquisition module 200 is used to adjust the current oil pressure to the target oil pressure corresponding to the clutch engagement point based on the first preset adjustment strategy if the current vehicle meets the preset motor speed regulation condition, and obtain the generator speed regulation torque and the required synchronous speed difference of the current vehicle;

[0110] The control module 300 is used to adjust the speed according to the generator speed regulation torque and the required synchronous speed difference, and when the speed adjustment is completed and the current vehicle meets the direct drive conditions, adjust the target oil pressure to the locking oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

[0111] Optionally, the judgment module 100 is specifically used to: obtain the current throttle opening, current gear switching information, peak discharge power of the power battery, and vehicle demand power of the current vehicle; if the current throttle opening is in a preset opening range, and the vehicle demand power is less than the peak allowable discharge power of the power battery, and the current gear switching information meets the preset switching conditions, then it is determined that the current vehicle meets the preset motor speed regulation conditions.

[0112] Optionally, the judgment module 100 is specifically used to: judge whether the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit; if the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, then based on the preset maximum speed regulation time, target oil pressure and required synchronous speed difference, the speed is adjusted according to the first speed regulation torque, wherein the first speed regulation torque is less than the preset speed regulation torque limit.

[0113] Optionally, after determining whether the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, the judgment module 100 is further used to: if the generator speed regulation torque is less than the preset speed regulation torque limit, determine whether there is a request to exit the gear shift speed regulation; if there is no request to exit the gear shift speed regulation, calculate the torque change slope of the clutch, and adjust the speed based on the preset maximum speed regulation time and the torque change slope of the clutch.

[0114] Optionally, after completing the speed adjustment, the judgment module 100 is also used to: obtain the actual vehicle speed and actual wheel-end torque of the current vehicle; if the actual vehicle speed is greater than the minimum vehicle speed corresponding to the direct drive condition, and the actual wheel-end torque is less than the minimum torque corresponding to the direct drive condition, then it is determined that the current vehicle meets the direct drive condition.

[0115] It should be noted that the above explanation of the embodiment of the vehicle shift control method is also applicable to the vehicle shift control device of this embodiment, which will not be repeated here.

[0116] According to the vehicle shift control device proposed in the embodiment of the present application, after judging that the current vehicle meets the preset motor speed regulation conditions, the embodiment of the present application can adjust the oil pressure to the target oil pressure corresponding to the clutch engagement point according to the first preset regulation strategy, and obtain the generator speed regulation torque and the speed difference that needs to be synchronized at this time, and then perform speed regulation. When the speed regulation is completed and the vehicle meets the conditions for entering the direct drive mode, the target oil pressure is adjusted to the locking oil pressure according to the second preset regulation strategy to complete the shifting action. Therefore, by entering the shifting speed regulation stage in advance to shorten the shifting time, the problem of the long gear switching process affecting the power of the car is solved, and the power of the car is improved when acceleration is required.

[0117] Figure 8 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0118] A memory 801 , a processor 802 , and a computer program stored in the memory 801 and executable on the processor 802 .

[0119] When the processor 802 executes the program, the vehicle shift control method provided in the above embodiment is implemented.

[0120] Furthermore, the vehicle also includes:

[0121] The communication interface 803 is used for communication between the memory 801 and the processor 802 .

[0122] The memory 801 is used to store computer programs that can be executed on the processor 802 .

[0123] The memory 801 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0124] If the memory 801, the processor 802 and the communication interface 803 are implemented independently, the communication interface 803, the memory 801 and the processor 802 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0125] Optionally, in a specific implementation, if the memory 801, the processor 802 and the communication interface 803 are integrated on a chip, the memory 801, the processor 802 and the communication interface 803 can communicate with each other through an internal interface.

[0126] The processor 802 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0127] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned vehicle shift control method is implemented.

[0128] This embodiment also provides a computer program product, which stores a computer program. When the program is executed by a processor, the above-mentioned vehicle shift control method is implemented.

[0129] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0130] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0131] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0132] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0133] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A vehicle shift control method, characterized in that: The following steps are involved: Determine whether the current vehicle meets the preset motor speed regulation conditions; If the current vehicle meets the preset motor speed regulation condition, the current oil pressure is regulated to the target oil pressure corresponding to the clutch engagement point based on the first preset regulation strategy, and the generator speed regulation torque and the required synchronous speed difference of the current vehicle are obtained; The speed is adjusted according to the generator speed regulation torque and the required synchronous speed difference, and when the speed adjustment is completed and the current vehicle meets the direct drive conditions, the target oil pressure is adjusted to the locking oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

2. The method according to claim 1, characterized in that The determining whether the current vehicle meets the preset motor speed regulation condition includes: Obtaining the current throttle opening, current gear switching information, peak discharge power of the power battery, and required power of the entire vehicle; If the current throttle opening is in a preset opening range, and the vehicle demand power is less than the peak allowable discharge power of the power battery, and the current gear switching information meets the preset switching conditions, it is determined that the current vehicle meets the preset motor speed regulation conditions.

3. The method according to claim 1, characterized in that The speed regulation according to the generator speed regulation torque and the required synchronous speed difference includes: Determining whether the generator speed regulating torque is greater than or equal to a preset speed regulating torque limit; If the generator speed regulation torque is greater than or equal to the preset speed regulation torque limit, the speed is adjusted according to the first speed regulation torque based on the preset maximum speed regulation time, the target oil pressure and the required synchronous speed difference, wherein the first speed regulation torque is less than the preset speed regulation torque limit.

4. The method according to claim 3, characterized in that After determining whether the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, the method further includes: If the generator speed regulating torque is less than the preset speed regulating torque limit, determining whether there is a request to exit the gear shift speed regulating; If the exit shift speed regulation request does not exist, the torque change slope of the clutch is calculated, and the speed is regulated based on the preset maximum speed regulation time and the torque change slope of the clutch.

5. The method according to claim 1, characterized in that: After completing the speed adjustment, it also includes: Obtaining the actual vehicle speed and actual wheel-end torque of the current vehicle; If the actual vehicle speed is greater than the minimum vehicle speed corresponding to the direct drive condition, and the actual wheel-end torque is less than the minimum torque corresponding to the direct drive condition, it is determined that the current vehicle meets the direct drive condition.

6. A vehicle shift control device, characterized in that: The following steps are involved: A judgment module is used to judge whether the current vehicle meets the preset motor speed regulation conditions; an acquisition module, configured to adjust the current oil pressure to a target oil pressure corresponding to a clutch engagement point based on a first preset adjustment strategy if the current vehicle satisfies the preset motor speed regulation condition, and to obtain a generator speed regulation torque and a required synchronous speed difference of the current vehicle; The control module is used to adjust the speed according to the generator speed regulation torque and the required synchronous speed difference, and when the speed adjustment is completed and the current vehicle meets the direct drive condition, adjust the target oil pressure to the locking oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

7. The vehicle shift control device according to claim 6, characterized in that: The judgment module is specifically used for: Obtaining the current throttle opening, current gear switching information, peak discharge power of the power battery, and required power of the entire vehicle; If the current throttle opening is in a preset opening range, and the vehicle demand power is less than the peak allowable discharge power of the power battery, and the current gear switching information meets the preset switching conditions, it is determined that the current vehicle meets the preset motor speed regulation conditions.

8. A vehicle, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle shift control method as claimed in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the vehicle shift control method according to any one of claims 1 to 5.

10. A computer program product, wherein the computer program product stores a computer program, characterized in that: When the program is executed by a processor, the vehicle shift control method according to any one of claims 1 to 5 is implemented.

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