Shift control method and device of vehicle, vehicle, medium and program product

Abstract

The application relates to the technical field of vehicles, in particular to a gear shifting control method and device of a vehicle, a vehicle, a medium and a program product, wherein the method comprises the following steps: judging whether a preset motor speed regulation condition is met by a current vehicle; if the preset motor speed regulation condition is met by the current vehicle, adjusting current oil pressure to target oil pressure corresponding to a clutch joint point based on a first preset adjustment strategy, and acquiring generator speed regulation torque and a synchronous speed difference value of the current vehicle; adjusting speed according to the generator speed regulation torque and the synchronous speed difference value, and when the speed adjustment is completed and the current vehicle meets an entering direct drive condition, adjusting the target oil pressure to lock oil pressure based on a second preset adjustment strategy, so as to complete a gear shifting action. Therefore, the gear shifting time is shortened by entering the gear shifting speed regulation stage in advance, the problem that the gear shifting process is long and affects the power performance of the automobile is solved, and the power performance of the automobile is improved when acceleration is needed.

Description

Technical Field

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

[0002] With the rapid growth of automobiles, enormous pressure has been placed on the environment and resources. Non-renewable energy sources are becoming increasingly scarce, making hybrid vehicles an important direction for current automotive development.

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

[0004] However, in the relevant technologies, the motor speed is adjusted only when the optimal shift line is reached during the gear shifting process. This can easily miss the optimal shifting time and greatly affect the vehicle's power performance. Furthermore, the motor speed adjustment during the shifting process will lower the engine speed. If the shifting is completed after missing the optimal shifting time, it will affect the rapid increase of engine speed and torque, resulting in the inability to maximize the use of engine capacity after entering direct drive. This issue urgently needs to be addressed. Summary of the Invention

[0005] This application provides a vehicle shifting control method, device, vehicle, medium, and program product to solve problems such as the long shifting process affecting the vehicle's power performance, and to improve the vehicle's power performance when acceleration is required.

[0006] The first aspect of this application provides a vehicle gear shifting control method, comprising the following steps:

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

[0008] 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 adjustment strategy, and the generator speed regulation torque and the difference in required synchronization speed of the current vehicle are obtained.

[0009] The speed is adjusted according to the difference between the generator speed regulation torque and the required synchronization speed. When the speed adjustment is completed and the current vehicle meets the conditions for entering direct drive, the target oil pressure is adjusted to the lock-up oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

[0010] Optionally, determining whether the current vehicle meets the preset motor speed control conditions includes:

[0011] The system obtains the current throttle opening, current gear shift information, peak discharge power of the power battery, and the required power of the entire vehicle.

[0012] If the current throttle opening is within a preset opening range, and the vehicle's required power is less than the peak allowable discharge power of the power battery, and the current gear shifting information meets the preset shifting conditions, then it is determined that the current vehicle meets the preset motor speed regulation conditions.

[0013] Optionally, the speed adjustment based on the difference between the generator speed-regulating torque and the required synchronization speed includes:

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

[0015] If the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, then based on the preset maximum speed regulating time, the target oil pressure and the difference in speed to be synchronized, the speed is adjusted according to the first speed regulating torque, wherein the first speed regulating torque is less than the preset speed regulating 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 regulation torque is less than the preset speed regulation torque limit, then determine whether there is a request to exit gear shift speed regulation;

[0018] If the request to exit gear shift and adjust speed does not exist, the torque change slope of the clutch is calculated, and the speed is adjusted based on the preset maximum speed adjustment time and the torque change slope of the clutch.

[0019] Optionally, after completing the speed adjustment, the following steps are also included:

[0020] Obtain the current vehicle's actual speed and actual wheel torque;

[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, then the current vehicle is determined to meet the direct drive condition.

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

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

[0024] The acquisition module 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 conditions, and to acquire the generator speed regulation torque and the difference in speed to be synchronized of the current vehicle.

[0025] The control module is used to adjust the speed according to the difference between the generator speed regulation torque and the required synchronization speed, and when the speed adjustment is completed and the current vehicle meets the conditions for entering direct drive, adjust the target oil pressure to the lock-up oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

[0026] Optionally, the determination module is specifically used for:

[0027] The system obtains the current throttle opening, current gear shift information, peak discharge power of the power battery, and the required power of the entire vehicle.

[0028] If the current throttle opening is within a preset opening range, and the vehicle's required power is less than the peak allowable discharge power of the power battery, and the current gear shifting information meets the preset shifting conditions, then it is determined that the current vehicle meets the preset motor speed regulation conditions.

[0029] Optionally, the determination module is specifically used for:

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

[0031] If the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, then based on the preset maximum speed regulating time, the target oil pressure and the difference in speed to be synchronized, the speed is adjusted according to the first speed regulating torque, wherein the first speed regulating torque is less than the preset speed regulating 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 determining module is further configured to:

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

[0034] If the request to exit gear shift and adjust speed does not exist, the torque change slope of the clutch is calculated, and the speed is adjusted based on the preset maximum speed adjustment time and the torque change slope of the clutch.

[0035] Optionally, after the speed adjustment is completed, the determination module is further configured to:

[0036] Obtain the current vehicle's actual speed and actual wheel torque;

[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, then the current vehicle is determined to meet the direct drive condition.

[0038] A third aspect of this application provides a vehicle, including: 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 perform a gear shifting control method for the vehicle as described in the above embodiments.

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

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

[0041] Therefore, after determining that the current vehicle meets the preset motor speed regulation conditions, this embodiment can adjust the oil pressure to the target oil pressure corresponding to the clutch engagement point according to the first preset adjustment strategy, and obtain the generator speed regulation torque and the speed difference that needs to be synchronized at this time. Then, speed regulation is performed. When the speed regulation is completed and the vehicle meets the conditions for entering direct drive mode, the target oil pressure is adjusted to the lock-up oil pressure according to the second preset adjustment strategy to complete the gear shifting action. Thus, by entering the gear shifting and speed regulation stage in advance to shorten the gear shifting time, the problem of long gear shifting process affecting the vehicle's power is solved, and the vehicle's power is improved when acceleration is required.

[0042] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

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

[0044] Figure 1 This is a flowchart of a vehicle shift control method according to an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of a vehicle shift control method according to an embodiment of this application;

[0046] Figure 3 This is a schematic diagram of the conventional vehicle shift control method provided according to an embodiment of this application;

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

[0048] Figure 5 This is a schematic diagram of the oil filling stage, speed regulation stage and lock-up stage during a gear shifting process according to a specific embodiment of this application.

[0049] Figure 6 This is a flowchart of a vehicle shift control method according to an embodiment of this application;

[0050] Figure 7 A schematic diagram of a vehicle shift control device provided in the embodiments of this application;

[0051] Figure 8 This is a structural schematic diagram of a vehicle provided according to an embodiment of this application. Detailed Implementation

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

[0053] The following description, with reference to the accompanying drawings, describes a vehicle shifting control method, apparatus, vehicle, medium, and program product according to embodiments of this application.

[0054] Before introducing the vehicle shift control method of the embodiments of this application, let me briefly introduce the background of the vehicle shift control method of this application, as well as the vehicle shift control methods in related technologies.

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

[0056] When a hybrid vehicle is tested to accelerate from 0 to 100 km / h under conditions of sufficient battery power and full throttle, the hybrid vehicle's gear mode will go through a process of changing from pure electric to range extender to direct drive. When switching from range extender to direct drive, the motor performs speed control, and the engagement of the gear shifting clutch will go through a filling stage, a speed adjustment stage, and a lock-up stage. This process takes a certain amount of time and will result in a reduction in the vehicle's power.

[0057] Furthermore, to solve the above problems, related technologies generally follow the principles of... Figure 3 The shift speed synchronization line shown indicates that the motor speed is adjusted only when the vehicle reaches the optimal shift line.

[0058] However, during the gear shifting process using electric motor speed regulation, under conditions of sufficient battery power and full throttle in a hybrid vehicle, the clutch will go through three stages—fueling, speed regulation, and locking—at the optimal shifting point. The sequential execution of these three stages will cause the optimal shifting point to be missed, resulting in a longer shifting process and significantly impacting the vehicle's power performance. Furthermore, the electric motor speed regulation during the shifting process will lower the engine speed. If the shift is completed after missing the optimal shifting point, it will affect the rapid increase in engine speed and torque, preventing the engine's capacity from being maximized after entering direct drive.

[0059] Based on the aforementioned shortcomings, this application proposes a vehicle gear shifting control method, wherein the gear shifting process of this application can be performed within a specified timeframe. Figure 2 (b) shows the range extender entering the direct drive process, which reduces shift time by controlling the clutch to enter the first two stages in advance, thereby further improving the vehicle's power performance.

[0060] Specifically, Figure 1 This is a schematic flowchart illustrating a vehicle gear shifting control method provided in an embodiment of this application.

[0061] like Figure 1 As shown, the shift control method of this vehicle 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 conditions refer to the specific conditions that determine whether the motor speed regulation process needs to be started in the gear shift control, so as to ensure that the advantages of the motor can be effectively utilized to quickly shift gears under specific driving conditions, thereby improving the vehicle's power performance.

[0064] Specifically, in this embodiment of the application, multiple key parameters are collected and analyzed to obtain relevant information about the current vehicle in order to determine whether the current vehicle meets the preset motor speed control conditions. If all conditions are met, it can be determined that the current vehicle meets the preset motor speed control conditions, and corresponding motor speed control measures can be taken.

[0065] Optionally, in some embodiments, determining whether the current vehicle meets the preset motor speed control conditions includes: obtaining 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 within the 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 control conditions.

[0066] The preset throttle opening range refers to the range within which the throttle opening of the vehicle is considered to indicate a driver's need for acceleration and a potential entry point for motor speed regulation. In practical applications, the preset opening range can be user-defined, obtained through a limited number of experiments, or derived through a limited number of computer simulations; no specific limitations are imposed here. The preset switching condition refers to the specific criteria used in the gear shift control method to determine whether the motor speed regulation process should be initiated.

[0067] Understandably, the process involves acquiring the vehicle's current throttle opening, i.e., detecting the degree of throttle operation by the driver to determine the driver's acceleration intention; acquiring the vehicle's current gear shift information, i.e., checking the current gear position and whether there is a need to upshift or downshift; acquiring the peak discharge power of the vehicle's power battery, i.e., monitoring the maximum discharge capacity of the power battery in real time to assess whether the battery can support the current power demand; and acquiring the vehicle's total power demand, calculating the required total power based on the vehicle's current operating conditions (such as speed, load, etc.). If the current throttle opening is within a preset range, it means that the driver is accelerating; if the total power demand is less than the peak allowable discharge power of the power battery, it means that the battery has the power to provide support; the current gear shift information must meet preset shifting conditions, such as the vehicle currently being in a certain gear and having a need to upshift. If all the above conditions are met, the embodiments of this application can determine that the current vehicle meets preset motor speed regulation conditions, and corresponding motor speed regulation measures can be taken.

[0068] For example, assuming the preset throttle opening range is [90%, 100%], if the current throttle opening is 95%, the vehicle's power requirement is 100kW, the peak allowable discharge power of the power battery is 200kW, and the current gear shift information is from second gear to third gear, since the current throttle opening of 95% is within the preset opening range [90%, 100%], and the vehicle's power requirement of 100kW is less than the peak allowable discharge power of the power battery of 200kW, and the shift from second gear to third gear meets the preset shift conditions, it is determined that the current vehicle meets the preset motor speed control 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 adjustment strategy, and the difference between the current vehicle's generator speed regulation torque and the required synchronous speed is obtained.

[0070] The first preset adjustment strategy refers to the strategy used to control the oil pressure to the target oil pressure corresponding to the clutch engagement point during gear shifting in a hybrid electric vehicle. Its main purpose is to quickly establish the oil pressure to the level corresponding to the so-called "kisspoint," thereby enabling the clutch to rapidly reach the critical point for torque transmission. The target oil pressure refers to the specific oil pressure level that needs to be achieved during gear shifting in a hybrid electric vehicle to ensure smooth torque transmission by the clutch. The target oil pressure can be preset by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations; no specific limitations are made here. Motor speed regulation torque (Tq_EM_Act) refers to the torque required by the motor to adjust the engine speed to match the target gear during gear shifting. The required synchronization speed difference (Δn) refers to the difference in engine speed between the engine and the target gear that needs to be adjusted during gear shifting to achieve smooth gear shifting between the engine and transmission. This difference is a key parameter used to ensure that the engine speed matches the target gear speed, thereby successfully completing the gear shift.

[0071] Specifically, if the current vehicle meets the preset motor speed control conditions, the current oil pressure will be adjusted to the target oil pressure corresponding to the clutch engagement point according to the first preset adjustment strategy, and the current vehicle's generator speed control torque (Tq_EM_Act) and the required synchronization speed difference (Δn) will be obtained. First, it is necessary to determine whether the current vehicle meets the preset motor speed control conditions. These conditions include, but are not limited to, the current throttle opening being within the preset opening range, the vehicle's required power being less than the peak allowable discharge power of the power battery, and the current gear shifting information meeting the preset shifting conditions. Once it is determined that the vehicle meets the motor speed control conditions, the current oil pressure will be adjusted to the target oil pressure corresponding to the clutch engagement point based on the first preset adjustment strategy. The target oil pressure refers to the oil pressure level required for the clutch to start transmitting torque, i.e., the oil pressure corresponding to the so-called "kisspoint". While adjusting the oil pressure, it is also necessary to obtain the current vehicle's generator speed control torque (Tq_EM_Act) and the required synchronization speed difference (Δn). The purpose is to ensure that during gear shifting, by entering the speed control phase in advance, the shifting time is reduced, thereby improving the power performance of the hybrid vehicle.

[0072] In step S103, the speed is adjusted according to the difference between the generator speed regulation torque and the required synchronization speed. When the speed adjustment is completed and the current vehicle meets the conditions for entering direct drive, the target oil pressure is adjusted to the lock-up oil pressure based on the second preset adjustment strategy to complete the gear shifting action.

[0073] The direct drive condition refers to a series of conditions in a hybrid electric vehicle that switch from hybrid mode to engine direct drive mode. The second preset adjustment strategy refers to the strategy of adjusting the target oil pressure to the lock-up oil pressure during the lock-up phase of gear shifting in a hybrid electric vehicle. The lock-up oil pressure is the specific oil pressure level required to transition the clutch from the speed adjustment phase to the lock-up phase during gear shifting in a hybrid electric vehicle; the lock-up oil pressure 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.

[0074] It should be noted that the motor speed-regulating torque is calculated by the embodiments of this application to ensure that the engine speed matches the requirements of the target gear during gear shifting, thereby achieving a smooth gear shifting process. During gear shifting, the magnitude of the motor speed-regulating torque directly affects the quality of the shift; if the motor speed-regulating torque is too large, it may cause unnecessary vibration or impact during gear shifting, affecting driving comfort; while if the speed-regulating torque is insufficient, it may lead to a prolonged gear shifting time, affecting the vehicle's power performance.

[0075] Specifically, in this embodiment, the speed is adjusted based on the generator speed-regulating torque (Tq_EM_Act) and the required speed difference (Δn). The speed-regulating torque limit (Tq_EM_limit) is used to ensure the safety and effectiveness of the speed regulation process. If the generator speed-regulating torque is greater than or equal to the preset speed-regulating torque limit, the clutch B maintains the oil pressure of the previous stage, and the generator completes speed synchronization with a torque less than the speed-regulating torque limit. If the generator speed-regulating torque is less than the preset speed-regulating torque limit, the speed regulation process continues, and the torque change slope of the clutch B is calculated to ensure that it does not cause vehicle vibration and that speed synchronization is completed during the speed regulation phase. During the speed regulation process, the torque transmitted by the clutch B (Tq_B) must be less than the input torque divided by a specific gear ratio (Tq_in / k). After completing the above speed regulation, this embodiment checks whether the current vehicle meets the conditions for entering direct drive. The conditions for entering direct drive include an actual vehicle speed (Vact) greater than a minimum vehicle speed (Vmin) and an actual wheel-end torque (Tqact) less than a minimum wheel-end torque (Tqmin). When the vehicle meets the conditions for entering direct drive, this embodiment of the application will adjust the target oil pressure to the lock-up 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 power performance.

[0076] It is important to note that the torque change of clutch B during the speed adjustment phase should not cause the vehicle to vibrate, and the speed adjustment phase should be completed synchronously. The torque change of clutch B during the speed adjustment phase should also maintain the consistency of the driving feel before and after gear shifting as much as possible to avoid any jerking sensation.

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

[0078] The maximum speed regulation time (Δt) refers to an empirical value or preset time period set during gear shifting to complete the speed regulation phase. This time period is determined through vehicle calibration to ensure that the engine and transmission speeds are correctly adjusted to synchronization during the speed regulation phase. 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; no specific limitation is made here. The first speed regulation torque refers to a smaller speed regulation torque used in this embodiment to adjust the speed when the generator speed regulation torque is greater than or equal to a preset speed regulation torque limit during gear shifting. 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; no specific limitation is made here.

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

[0080] Therefore, after determining that the current vehicle meets the preset motor speed regulation conditions, this embodiment can adjust the oil pressure to the target oil pressure corresponding to the clutch engagement point according to the first preset adjustment strategy, and obtain the generator speed regulation torque and the speed difference that needs to be synchronized at this time. Then, speed regulation is performed. When the speed regulation is completed and the vehicle meets the conditions for entering direct drive mode, the target oil pressure is adjusted to the lock-up oil pressure according to the second preset adjustment strategy to complete the gear shifting action. Thus, by entering the gear shifting and speed regulation stage in advance to shorten the gear shifting time, the problem of long gear shifting process affecting the vehicle's power is solved, and the vehicle's power is improved when acceleration is required.

[0081] Optionally, in some embodiments, after determining whether the generator speed regulating torque is greater than or equal to a 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 gear shift speed regulation; if there is no request to exit 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 "exit gear shift speed adjustment request" refers to a signal or command issued to stop the current gear shift speed adjustment process when, during the gear shifting process, this embodiment detects that certain conditions are no longer met to continue the gear shift speed adjustment. The torque change slope (Slope_Tq) refers to the rate at which the clutch-transmitted torque changes over time during the gear shifting process.

[0083] It is understood that this application embodiment determines whether the generator speed-regulating torque is less than a 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 gear shift speed regulation; if there is a request to exit gear shift speed regulation, the current speed regulation process is stopped, and no further speed adjustment is performed; if there is no request to exit gear shift speed regulation, this application embodiment calculates the torque change slope of the clutch (i.e., the rate of change of clutch torque over time); based on the preset maximum speed regulation time and the calculated clutch torque change slope, this application embodiment performs speed adjustment to ensure that speed synchronization is completed within a specified time. By controlling the torque change slope, it is possible to ensure the gradual increase or decrease of the torque transmitted by the clutch, thereby avoiding sudden torque changes that could cause vehicle vibration or jerking; speed adjustment based on the preset maximum speed regulation time and the clutch torque change slope ensures that speed synchronization is completed within a specified time.

[0084] Therefore, by controlling the torque change slope of the clutch, the speed adjustment is completed within the preset maximum speed adjustment time, shortening the speed adjustment time, improving shifting efficiency, ensuring the consistency of the driving experience during shifting, avoiding discomfort caused by shifting, and enhancing the user's driving experience.

[0085] Optionally, in some embodiments, after completing the speed adjustment, the method further 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 entering the direct drive condition, and the actual wheel-end torque is less than the minimum torque corresponding to entering the direct drive condition, then it is determined that the current vehicle meets the conditions for entering 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 unstable phenomena during gear shifting due to 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 dropped 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 condition for entering the direct drive mode.

[0088] Thus, by determining when the current vehicle meets the condition for entering the direct drive mode, the optimal 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 reference to 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: The first stage of gear shifting is the oil filling stage, which quickly builds up the oil pressure to the oil pressure corresponding to the kisspoint, so that the clutch can quickly reach the torque transmission point;

[0095] S603: Second stage of gear shifting, speed regulation stage. The completion time of the speed regulation stage is confirmed to be the empirical value Δt (vehicle calibration required). At this time, the synchronous speed difference needs to be checked to be Δn. The generator speed regulation torque in 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 speed synchronization at a rate less than Tq_EM_limit1.

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

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

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

[0100] Condition 2: During the speed adjustment phase, the torque change of clutch B should not cause the whole vehicle to vibrate (vehicle calibration required), and the speed adjustment phase should be completed synchronously.

[0101] Condition 3: During the speed adjustment phase, the torque change of clutch B should maintain the same driving feel before and after gear shifting as much as possible, and there should be no jerking sensation (requires vehicle calibration).

[0102] S604: The third stage of gear shifting is the lock-up stage. When the vehicle speed and wheel torque meet the conditions for entering direct drive, the hydraulic pressure of clutch B rises to the lock-up hydraulic pressure, and the gear shift ends.

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

[0104] According to the vehicle shift control method proposed in this application, after determining 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 adjustment strategy. The generator speed regulation torque and the required synchronization speed difference are then obtained, and speed regulation is performed. When the speed regulation is completed and the vehicle meets the conditions for entering direct drive mode, the target oil pressure is adjusted to the lock-up oil pressure according to the second preset adjustment strategy, completing the shift action. Therefore, by entering the shift speed regulation stage earlier, the shift time is shortened, solving the problem of long shifting processes affecting vehicle power, and improving vehicle power when acceleration is needed.

[0105] Next, referring to the accompanying drawings, a vehicle shift control device according to an embodiment of this application is described.

[0106] Figure 7 This is a block diagram of a vehicle shift control device according to an embodiment of this application.

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

[0108] The judgment module 100 is used to determine 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 conditions, and to acquire the generator speed regulation torque and the difference in speed to be synchronized of the current vehicle.

[0110] The control module 300 is used to adjust the speed according to the difference between the generator speed regulation torque and the required synchronization speed. When the speed adjustment is completed and the current vehicle meets the conditions for entering direct drive, the target oil pressure is adjusted to the lock-up 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 within 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: determine whether the generator speed regulating torque is greater than or equal to a preset speed regulating torque limit; if the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, then based on the preset maximum speed regulating time, target oil pressure and the difference between the required synchronous speed, the speed is adjusted according to the first speed regulating torque, wherein the first speed regulating torque is less than the preset speed regulating torque limit.

[0113] Optionally, after determining whether the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, the determination module 100 is further configured to: if the generator speed regulating torque is less than the preset speed regulating torque limit, determine whether there is a request to exit gear shift speed regulation; if there is no request to exit 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 the speed adjustment is completed, the judgment module 100 is further 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 the current vehicle is determined to meet the direct drive condition.

[0115] It should be noted that the foregoing explanation of the vehicle shift control method embodiment also applies to the vehicle shift control device of this embodiment, and will not be repeated here.

[0116] According to the vehicle shift control device proposed in this application embodiment, after determining that the current vehicle meets the preset motor speed regulation conditions, this application embodiment can adjust the oil pressure to the target oil pressure corresponding to the clutch engagement point according to the first preset adjustment strategy, and obtain the generator speed regulation torque and the speed difference that needs to be synchronized at this time. Then, speed regulation is performed. When the speed regulation is completed and the vehicle meets the conditions for entering direct drive mode, the target oil pressure is adjusted to the lock-up oil pressure according to the second preset adjustment strategy to complete the shifting action. Thus, by entering the shifting speed regulation stage in advance, the shifting time is shortened, solving the problem that the long shifting process affects the vehicle's power performance, and improving the vehicle's power performance when acceleration is required.

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

[0118] The memory 801, the processor 802, and the computer program stored on the memory 801 and capable of running on the processor 802.

[0119] When the processor 802 executes the program, it implements the vehicle shift control method provided in the above embodiments.

[0120] Furthermore, the vehicle also includes:

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

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

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

[0124] If the memory 801, processor 802, and communication interface 803 are implemented independently, then the communication interface 803, memory 801, and processor 802 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be divided into address buses, data buses, control buses, etc. For ease of representation, Figure 8 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

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

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

[0127] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the vehicle shift control method described above.

[0128] This embodiment also provides a computer program product, which stores a computer program that, when executed by a processor, implements the above-described vehicle shift control method.

[0129] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

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

[0131] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0132] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0133] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

Claims

1. A method for controlling gear shifting in a vehicle, characterized in that, Includes the following steps: Determine whether the current vehicle meets the preset motor speed control conditions; 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 adjustment strategy, and the generator speed regulation torque and the difference in required synchronization speed of the current vehicle are obtained. Speed ​​adjustment is performed based on the difference between the generator speed regulation torque and the required synchronization speed. When the speed adjustment is completed and the current vehicle meets the conditions for entering direct drive, the target oil pressure is adjusted to the lock-up oil pressure based on the second preset adjustment strategy to complete the gear shifting action. The step of adjusting the speed based on the difference between the generator speed regulating torque and the required synchronization speed includes: determining whether the generator speed regulating torque is greater than or equal to a preset speed regulating torque limit; if the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, then adjusting the speed based on a first speed regulating torque according to a preset maximum speed regulating time, the target oil pressure, and the difference between the required synchronization speed, wherein the first speed regulating torque is less than the preset speed regulating torque limit.

2. The method according to claim 1, characterized in that, The determination of whether the current vehicle meets the preset motor speed control conditions includes: The system acquires the current throttle opening, current gear shift information, peak discharge power of the power battery, and the required power of the entire vehicle. If the current throttle opening is within a preset opening range, the vehicle's required power is less than the peak allowable discharge power of the power battery, and the current gear shifting information meets the preset shifting conditions, then it is determined that the current vehicle meets the preset motor speed regulation conditions.

3. The method according to claim 1, 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 regulation torque is less than the preset speed regulation torque limit, then determine whether there is a request to exit gear shift speed regulation; If the request to exit gear shift and adjust speed does not exist, the torque change slope of the clutch is calculated, and the speed is adjusted based on the preset maximum speed adjustment time and the torque change slope of the clutch.

4. The method according to claim 1, characterized in that, After completing the speed adjustment, the following is also included: Obtain the current vehicle's actual speed and actual wheel torque; 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 the current vehicle is determined to meet the direct drive condition.

5. A vehicle gear shift control device, characterized in that, include: The judgment module is used to determine whether the current vehicle meets the preset motor speed regulation conditions; The acquisition module 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 conditions, and to acquire the generator speed regulation torque and the difference in speed to be synchronized of the current vehicle. The control module is used to adjust the speed according to the difference between the generator speed regulation torque and the required synchronization speed, and when the speed adjustment is completed and the current vehicle meets the conditions for entering direct drive, adjust the target oil pressure to the lock-up oil pressure based on the second preset adjustment strategy to complete the gear shifting action. The step of adjusting the speed based on the difference between the generator speed regulating torque and the required synchronization speed includes: determining whether the generator speed regulating torque is greater than or equal to a preset speed regulating torque limit; if the generator speed regulating torque is greater than or equal to the preset speed regulating torque limit, then adjusting the speed based on a first speed regulating torque according to a preset maximum speed regulating time, the target oil pressure, and the difference between the required synchronization speed, wherein the first speed regulating torque is less than the preset speed regulating torque limit.

6. The vehicle shift control device according to claim 5, characterized in that, The judgment module is specifically used for: The system acquires the current throttle opening, current gear shift information, peak discharge power of the power battery, and the required power of the entire vehicle. If the current throttle opening is within a preset opening range, the vehicle's required power is less than the peak allowable discharge power of the power battery, and the current gear shifting information meets the preset shifting conditions, then it is determined that the current vehicle meets the preset motor speed regulation conditions.

7. A vehicle, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the vehicle shift control method as described in any one of claims 1-4.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the shift control method for the vehicle as described in any one of claims 1-4.

9. A computer program product, said computer program product storing a computer program, characterized in that, When the program is executed by the processor, it implements the vehicle shift control method as described in any one of claims 1-4.

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