Gear shifting control method and device and vehicle

Abstract

The invention provides a gear shifting control method and device and a vehicle. The method comprises the steps that when a gear shifting instruction of the vehicle is received, the current gear shifting type is determined, and if a target motor of the vehicle has a power supplementing requirement under the current gear shifting type, the power supplementing requirement is met based on a power supplementing stage corresponding to the current gear shifting type; determining the target power supply power of the target motor in the power supplement stage, and adjusting the target output power of the power battery to the target motor in the power supplement stage based on the target power supply power and the peak power output duration of the power battery, the target power supply power is used for representing the power required to be provided for the target motor when the power battery of the vehicle runs under the peak power, so that the peak power of the power battery can be fully utilized to supply power to the target motor in the power supplement stage corresponding to the current gear shifting type; therefore, the target motor has sufficient capability for speed regulation or torque compensation in the gear shifting process, and the stability of the gear shifting process can be effectively improved.

Description

Technical Field

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

[0002] With the continuous development of vehicle technology, the performance requirements for vehicles are getting higher and higher. For vehicles equipped with gearboxes, gear shift control is essential. For DCT (Dual-clutch Hybrid Transmission) and DHT (Dedicated Hybrid Transmission), the gear shift control process is similar. When the driver needs to change the speed of the vehicle, a gear shift command will be issued, such as pressing the accelerator pedal or turning the gear lever. This command will be transmitted to the vehicle's control system to switch gears. The smoothness of the gear shift process is an important factor affecting the overall performance of the vehicle.

[0003] In order to improve the smoothness of the gear shifting process, it is usually necessary to supplement the power of the motor during the gear shifting process to adjust the speed or compensate the torque of the motor. However, due to the complexity of the gear shifting process, it is currently impossible to supplement the power of the motor in a timely and effective manner during the gear shifting process, making it difficult to effectively improve the smoothness of the gear shifting process. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a gear shift control method, device and vehicle to solve the problem that the prior art cannot timely and effectively supplement the power of the motor during the gear shift process.

[0005] To achieve the above technical objectives, the present application provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present specification provides a shift control method, comprising:

[0007] Upon receiving a gear shift command from the vehicle, determining a current gear shift type;

[0008] If the target motor of the vehicle has a power replenishment demand under the current gear shift type, then based on the power replenishment stage corresponding to the current gear shift type, determine the target power supply power of the target motor in the power replenishment stage; the target power supply power is used to represent the power that the power battery of the vehicle needs to provide to the target motor when running at peak power;

[0009] Based on the target power supply power and the peak power output duration of the power battery, the target output power of the power battery to the target motor during the power supplement phase is adjusted.

[0010] In one embodiment, the power supplementation stage is a torque supplementation stage or a speed regulation stage;

[0011] The determining, based on the power supplement stage corresponding to the current gear shift type, the target power supply power of the target motor in the power supplement stage includes:

[0012] If the power supplement stage is the torque supplement stage, the target power supply power is determined based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery;

[0013] If the power supplement stage is the speed regulation stage, the target power supply power is determined based on the predetermined peak power of the power battery.

[0014] In one embodiment, determining the target power supply power based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery includes:

[0015] Determining the required power of the target motor in the torque compensation stage based on the driving parameters in the current gear and the transmission parameters in the target gear;

[0016] The target power supply power is determined based on the relationship between the required power and the predetermined peak power.

[0017] In one embodiment, the driving parameters include the wheel end torque of the vehicle and the speed of the target motor, and the transmission parameters include the gearbox ratio;

[0018] The determining the required power of the target motor in the torque compensation stage based on the driving parameters in the current gear and the transmission parameters in the target gear includes:

[0019] Determining the required torque of the target motor in the torque compensation phase based on the wheel end torque of the vehicle in the current gear and the gearbox speed ratio in the target gear;

[0020] The required power is determined based on the required torque and the speed of the target motor in the current gear.

[0021] In one implementation, determining the target power supply power based on the magnitude relationship between the required power and the predetermined peak power includes:

[0022] If the required power is less than the predetermined peak power, the required power is used as the target power supply power;

[0023] If the required power is greater than or equal to the predetermined peak power, the predetermined peak power is used as the target power supply power.

[0024] In one embodiment, adjusting the target output power of the power battery to the target motor in the power replenishment phase based on the target power supply power and the peak power output duration of the power battery includes:

[0025] If the peak power output duration of the power battery is less than the predetermined duration limit, the target power supply power is used as the target output power;

[0026] If the peak power output duration of the power battery is greater than or equal to the predetermined duration limit, the continuous power of the power battery is used as the target output power.

[0027] In one embodiment, the peak power output duration includes an equivalent cumulative value of the operating duration of the power battery at peak power;

[0028] The process of determining the peak power output duration includes:

[0029] Based on the actual output power of each time interval when the power battery operates at peak power, the target step length corresponding to each time interval is determined respectively; wherein the duration of each time interval is a predetermined duration, and the target step length corresponding to the time interval is positively correlated with the actual output power of the time interval;

[0030] The cumulative sum of the target step lengths corresponding to the time intervals is used as the peak power output duration.

[0031] In one embodiment, determining the target step size corresponding to each time interval based on the actual output power of each time interval when the power battery operates at the peak power includes:

[0032] Based on the actual output power of the power battery in the time interval, the first step length corresponding to the first peak power, and the second step length corresponding to the second peak power, the target step length corresponding to the time interval is determined by interpolation.

[0033] In a second aspect, an embodiment of the present specification provides a shift control device, comprising:

[0034] A first processing module, configured to determine a current gear shift type upon receiving a gear shift instruction from a vehicle;

[0035] A second processing module is used to determine, if the target motor of the vehicle has a power replenishment demand under the current gear shift type, a target power supply power of the target motor in the power replenishment stage based on the power replenishment stage corresponding to the current gear shift type; the target power supply power is used to represent the power that the power battery of the vehicle needs to provide to the target motor when running at peak power;

[0036] The third processing module is used to adjust the target output power of the power battery to the target motor in the power supplement phase based on the target power supply power and the peak power output duration of the power battery.

[0037] In a third aspect, an embodiment of the present specification provides a vehicle, including a power battery, a motor, and a shift control device as described above.

[0038] In a fourth aspect, an embodiment of the present specification provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the shift control method as described in any one of the above items is implemented.

[0039] In a fifth aspect, an embodiment of the present specification provides a computer program product or a computer program, wherein the computer program product includes a computer program, and the computer program is stored in a computer-readable storage medium; the processor of the computer device reads the computer program from the computer-readable storage medium, and when the processor executes the computer program, it implements the shift control method as described in any one of the above items.

[0040] It can be seen from the above technical scheme that the embodiments of the present application provide a gear shift control method, device and vehicle. When the method receives a gear shift command from the vehicle, it determines the current gear shift type. If the target motor of the vehicle has a power replenishment demand under the current gear shift type, the target power supply power of the target motor in the power replenishment stage is determined based on the power replenishment stage corresponding to the current gear shift type, and based on the target power supply power and the peak power output duration of the power battery, the target output power of the power battery to the target motor in the power replenishment stage is adjusted, wherein the target power supply power is used to characterize the power that needs to be provided to the target motor when the power battery of the vehicle is running at peak power. Therefore, in the power replenishment stage corresponding to the current gear shift type, the peak power of the power battery can be fully utilized to power the target motor, so that the target motor can be timely and effectively supplemented with power, so that the target motor has sufficient capacity to adjust speed or compensate torque during the gear shift process, thereby effectively improving the smoothness of the gear shift process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0042] Figure 1 A schematic flow chart of a shift control method provided for an implementation of this specification.

[0043] Figure 2 A flowchart of another shift control method provided for an implementation of this specification.

[0044] Figure 3 A schematic structural diagram of a shift control device provided for an implementation of this specification. DETAILED DESCRIPTION

[0045] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification shall have the common meanings understood by persons with ordinary skills in the field to which this specification belongs. The words "first", "second" and similar words used in the embodiments of this specification do not indicate any order, quantity or importance, but are only used to avoid confusion of constituent elements.

[0046] Unless the context requires otherwise, throughout the specification, "plurality" means "at least two", and "including" is interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the specification. The schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0047] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0048] Overview

[0049] As described in the background technology, with the continuous development of vehicle technology, the performance requirements for vehicles are getting higher and higher. For vehicles equipped with gearboxes, gear shift control is essential. For DCT (Dual-clutch Hybrid Transmission) and DHT (Dedicated Hybrid Transmission), the gear shift control process is similar. When the driver needs to change the speed of the vehicle, a gear shift command will be issued, such as pressing the accelerator pedal or turning the gear lever. This command will be transmitted to the vehicle's control system to switch gears. The smoothness of the gear shift process is an important factor affecting the overall performance of the vehicle.

[0050] Among them, the shifting process usually includes speed regulation (executed in the speed phase), torque alternation (executed in the torque phase) and clutch locking. During the shifting process, the speed of the output shaft of the gearbox before and after the shifting needs to remain unchanged. However, due to the change in the gear ratio of the gearbox, the speed of the input shaft of the gearbox before and after the shifting is inconsistent. Therefore, during the shifting process, the speed of the input shaft of the gearbox needs to be adjusted in the speed phase. At the same time, in the torque phase, the controller will operate the clutch to disconnect the power transmission of the current gear and connect the clutch of the next gear. This process requires precise control of the engagement and disengagement of the clutch so that the torque transmitted by the gearbox is switched from one clutch to another to ensure the smoothness and efficiency of the shifting process. After the torque alternation is completed, the clutch under the gear before the shifting is controlled to be fully opened and the clutch of the target gear is controlled to be fully locked.

[0051] In order to improve the smoothness of the gear shifting process, it is necessary to timely and effectively adjust the speed or compensate the torque of the motor. Therefore, it is usually necessary to supplement the power of the motor during the gear shifting process to adjust the speed or compensate the torque of the motor. However, since the gear shifting process is relatively complicated, when the power supply of the motor is limited, the capacity of the motor will be limited, and the power of the motor cannot be supplemented in time and effectively, resulting in slow speed adjustment and torque compensation of the motor, making it difficult to effectively improve the smoothness of the gear shifting process.

[0052] In order to solve the problem that traditional methods cannot timely and effectively supplement the power of the motor during the gear shifting process, in the technical solution of the present application, the gear shift control method determines the current gear shift type when receiving the gear shift command of the vehicle. If the target motor of the vehicle has a power supplement demand under the current gear shift type, the target power supply power of the target motor in the power supplement stage is determined based on the power supplement stage corresponding to the current gear shift type, and the target output power of the power battery to the target motor in the power supplement stage is adjusted based on the target power supply power and the peak power output duration of the power battery, wherein the target power supply power is used to characterize the power that needs to be provided to the target motor when the power battery of the vehicle is running at peak power. Therefore, in the power supplement stage corresponding to the current gear shift type, the peak power of the power battery can be fully utilized to power the target motor, so that the target motor can be supplemented with power in a timely and effective manner, so that the target motor has sufficient capacity to adjust speed or compensate torque during the gear shifting process, thereby effectively improving the smoothness of the gear shifting process.

[0053] Based on the above-mentioned inventive concept, the shift control method provided in the embodiment of this specification is exemplarily described below.

[0054] Exemplary Methods

[0055] The embodiment of this specification provides a shift control method, such as Figure 1 As shown, including:

[0056] S101. When receiving a gear shift instruction from a vehicle, determine a current gear shift type.

[0057] Specifically, the shift command is used to control the vehicle to switch gears. In practice, the shift command may be a command input by the driver through an operating device such as an accelerator pedal and a gear lever in the vehicle. That is, the shift command may include a vehicle speed control signal and a gear control signal.

[0058] The current shift type may be the shift type represented by the received shift instruction, and the current shift type may be one of a plurality of candidate shift types, and the candidate shift types may include power upshift, power downshift, non-power upshift, and non-power downshift, etc. For example, when the vehicle speed control signal is used to control the vehicle speed to increase, and the gear control signal is used to control the vehicle to switch from a low gear to a high gear, it may be determined that the current shift type is a power upshift; when the vehicle speed control signal is used to control the vehicle speed to remain unchanged or decrease, and the gear control signal is used to control the vehicle to switch from a low gear to a high gear, it may be determined that the current shift type is a non-power upshift; when the vehicle speed control signal is used to control the vehicle speed to increase, and the gear control signal is used to control the vehicle to switch from a high gear to a low gear, it may be determined that the current shift type is a power downshift; when the vehicle speed control signal is used to control the vehicle speed to remain unchanged or decrease, and the gear control signal is used to control the vehicle to switch from a high gear to a low gear, it may be determined that the current shift type is a non-power downshift.

[0059] S102. If the target motor of the vehicle has a power replenishment demand under the current gear shift type, the target power supply power of the target motor in the power replenishment stage is determined based on the power replenishment stage corresponding to the current gear shift type; the target power supply power is used to characterize the power that needs to be provided to the target motor when the power battery of the vehicle is running at peak power.

[0060] Specifically, the target motor of the vehicle is the motor used to drive the vehicle or recover energy during the gear shifting process. The power supplement demand is the need to provide additional power to the target motor, which may include speed regulation demand and torque compensation demand. The speed regulation demand is the need to provide additional power in the speed phase to increase the speed of the target motor, and the torque compensation demand is the need to provide additional power in the torque phase to increase the torque of the target motor.

[0061] In implementation, it is possible to determine whether the target motor has a power supplement requirement under the current gear shift type based on a predetermined correspondence between the gear shift type and the power supplement requirement. The power supplement stage may include a speed regulation stage corresponding to the speed regulation requirement and a torque supplement stage corresponding to the torque supplement requirement. In the case of a power supplement requirement, the power supplement stage may be further determined based on the category of the power supplement requirement.

[0062] For example, when the current shift type is power upshift, torque alternation can be performed first and then speed regulation. In the torque phase, the torque is transmitted from the motor end to the wheel end, and the output torque T of the target motor is mot The input torque T of the wheel end whl The corresponding relationship between them can be shown as formula (1):

[0063] T whl =T mot *i g *η (1)

[0064] In the formula, i g is the gearbox speed ratio, η is the transmission efficiency of the gearbox. g will decrease. From formula (1), we can know that when the output torque T of the target motor mot When the input torque T at the wheel end remains unchanged, whl will decrease, so in order to ensure the smoothness of the gear shift, the target motor needs to be torqued during the torque phase of the gear shift. Considering that the power battery usually supplies power to the target motor according to the continuous power during the power upshift, if no additional power is provided to provide torque compensation for the target motor after the gearbox ratio becomes smaller during the power upshift, the input torque at the wheel end will suddenly decrease, which will lead to insufficient acceleration of the vehicle and the inability to ensure the smoothness of the gear shift process. That is, when the current gear shift type is power upshift, there is a need for torque compensation, and the power supplement stage corresponding to the current gear shift type is the torque compensation stage.

[0065] When the current gear shift type is non-power upshift, the speed can be adjusted first and then the torque alternation can be performed. At this time, the vehicle has no power demand and the clutch is fully open. Affected by the inertia of the vehicle, the speed at the output end of the gearbox will not change suddenly. Therefore, the driver has no obvious perception of the gear shift, and there is no need to provide additional power for speed regulation or torque compensation, that is, there is no need for power supplement.

[0066] When the current shift type is power downshift, the speed can be adjusted first and then the torque can be alternating. In the speed phase, the speed is transmitted from the motor end to the wheel end. The speed of the target motor is N mot The output shaft speed N of the gearbox out The corresponding relationship between them can be shown as formula (2):

[0067] N out =N mot / i g (2)

[0068] After power downshift, the gearbox ratio is i g will become larger. From formula (2), we can know that at the target motor speed N mot Under the condition of remaining unchanged, the output shaft speed of the gearbox N outwill decrease, thus, in order to ensure the smoothness of the gear shift, the target motor needs to be speed-regulated in the speed phase of the gear shift, that is, when the current gear shift type is power downshift, there is a speed regulation demand, and the power supplement phase corresponding to the current gear shift type is the speed regulation phase. It can be understood that if the clutch inside the gearbox is fully opened in the speed phase, the target motor no longer drives the vehicle, and the torque of the target motor can be used for rapid speed regulation at this time, but in this case, no torque can be transmitted to the wheel end, the power of the vehicle is interrupted, and the smoothness of the gear shift process cannot be guaranteed. In order to improve the situation of power interruption, the clutch can be controlled not to be fully opened to achieve the transmission of the torque output by the target motor to the wheel end. However, at this time, the target motor needs to be speed-regulated and output torque to the clutch to drive the vehicle at the same time, thus, it is necessary to provide additional power for the target motor for speed regulation. Among them, during the speed regulation process of the target motor, the clutch is always in a slip state, and the clutch will generate a large amount of heat in the slip state. Therefore, the clutch transmission torque to be retained when the target motor is speed-regulated can be determined based on the premise that the heat generated by the clutch is less than or equal to the preset heat, and then the degree of engagement of the clutch can be determined based on the clutch transmission torque to be retained.

[0069] When the current shift type is non-power downshift, torque alternation can be performed first and then speed regulation. In the torque phase, due to downshift, the gearbox ratio will increase. According to formula (1), while keeping the input torque of the wheel end unchanged, the absolute value of the output torque of the target motor (the output torque of the target motor is negative during energy recovery) needs to decrease. Therefore, the gearbox has sufficient capacity for torque alternation. However, in the speed phase, due to the increase in the gearbox ratio, the speed of the target motor needs to be increased. When the power supply power of the target motor is constant, the torque will inevitably decrease when the speed of the target motor increases. In order to ensure that the recovery torque of the wheel end remains unchanged to ensure the smoothness of the shift, it is necessary to provide additional power for the target motor for speed regulation to avoid the output torque of the target motor decreasing in the process of increasing the speed of the target motor, which leads to a decrease in the wheel end recovery torque. That is, when the current shift type is non-power downshift, there is a speed regulation demand, and the power supplement stage corresponding to the current shift type is the speed regulation stage.

[0070] It is understood that, in any gear shifting type, clutch lockup is the last stage in the gear shifting process.

[0071] The target power supply power can be used to characterize the power that needs to be provided to the target motor when the power battery is running at peak power. It can be understood that the target power supply power can be greater than the continuous power of the power battery and less than or equal to the predetermined peak power of the power battery, thereby being able to fully utilize the peak power of the power battery to provide additional power to the target motor for speed regulation or torque compensation while avoiding over-power operation of the power battery.

[0072] In implementation, after determining the power replenishment stage corresponding to the current gear shift type, the required power of the target motor in the power replenishment stage can be determined based on the power replenishment stage, and the target power supply power can be determined based on the required power and the predetermined peak power of the power battery. For example, the smaller of the required power and the predetermined peak power can be used as the target power supply power to avoid over-power operation of the power battery, thereby achieving effective operation of the power battery. Among them, the required power determination strategy in the power replenishment stage corresponding to the current gear shift type can be determined based on the predetermined correspondence between the power replenishment stage and the required power determination strategy, and used as the target strategy to determine the required power of the target motor in the power replenishment stage based on the target strategy. Among them, the required power determination strategy corresponding to different power replenishment stages can be set according to actual needs, and no specific limitation is made here.

[0073] Among them, during the normal operation of the vehicle, the target motor is usually powered by the continuous power of the vehicle's power battery. The continuous power is the power that the power battery can output stably for a long time. It reflects the power output that the power battery can continuously provide under normal driving conditions. It has an important impact on the vehicle's daily driving performance, fuel economy and mileage.

[0074] S103: Based on the target power supply power and the peak power output duration of the power battery, adjust the target output power of the power battery to the target motor during the power replenishment phase.

[0075] Specifically, the peak power output duration of the power battery may be the cumulative value of the operating duration of the power battery at the peak power, and the cumulative value may be an actual cumulative value or an equivalent cumulative value. The actual cumulative value may be the total duration of requesting power from the power battery according to the peak power, and the equivalent cumulative value may be the cumulative value of the peak power equivalent output duration determined according to the actual output power of the power battery. For example, in the process of requesting power from the power battery according to the peak power, for any time interval, if the actual output power of the power battery is greater than the requested peak power, then the peak power equivalent output duration of the power battery in the time interval is greater than the actual duration of the time interval; if the actual output power of the power battery is less than the requested peak power, then the peak power equivalent output duration of the power battery in the time interval is less than the actual duration of the time interval; if the actual output power of the power battery is equal to the requested peak power, then the peak power equivalent output duration of the power battery in the time interval is equal to the actual duration of the time interval.

[0076] Among them, the peak power can be greater than the continuous power, which represents the maximum power that the power battery can release in a short period of time, that is, the peak power represents the ability of the battery to provide additional power under extreme conditions. The higher the peak power, the better the performance of the vehicle. It can be understood that the power battery can include multiple peak powers, and different peak powers correspond to different maximum peak power output durations. The larger the peak power, the shorter the maximum peak power output duration.

[0077] The target output power of the power battery to the target motor is the power that the target motor can request from the power battery. In implementation, the target output power of the power battery to the target motor during the power replenishment phase can be adjusted based on the target power supply power and the peak power output duration of the power battery. For example, when the peak power output duration of the power battery is less than the predetermined duration limit, the target power supply power can be used as the target output power. When the peak power output duration of the power battery is greater than or equal to the predetermined duration limit, the continuous power of the power battery can be used as the target output power.

[0078] Therefore, in the power replenishment stage corresponding to the current gear shift type, the peak power of the power battery can be fully utilized to power the target motor, so that the power of the target motor can be replenished in a timely and effective manner, so that the target motor has sufficient capacity to adjust speed or compensate torque during the gear shift process, thereby effectively improving the smoothness of the gear shift process.

[0079] In a feasible implementation manner, the power supplementation stage is a torque supplementation stage or a speed regulation stage;

[0080] The determining, based on the power supplement stage corresponding to the current gear shift type, the target power supply power of the target motor in the power supplement stage includes:

[0081] If the power supplement stage is the torque supplement stage, the target power supply power is determined based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery;

[0082] If the power supplement stage is the speed regulation stage, the target power supply power is determined based on the predetermined peak power of the power battery.

[0083] Specifically, the current gear of the vehicle may be the gear of the vehicle when the vehicle shift instruction is received, and the target gear may be the gear of the vehicle after the shift. The predetermined peak power of the power battery may be a pre-configured peak power of the power battery, for example, the peak power sent by the battery management system.

[0084] The driving parameters may be used to characterize the power driving state of the vehicle, for example, they may include wheel end torque, motor speed, etc. The transmission parameters may be used to characterize the power transmission state of the vehicle, for example, they may include gearbox ratio, etc.

[0085] In the case where the power supplementation stage is a torque supplementation stage, the target power supply power may be determined based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery. For example, the required power of the target motor in the torque supplementation stage during the gear shifting process may be determined based on the driving parameters in the current gear and the transmission parameters in the target gear, so as to determine the target power supply power of the target motor in the torque supplementation stage according to the required power and the predetermined peak power of the power battery, thereby effectively improving the validity of the determination result of the target power supply power.

[0086] When the power supplement stage is a speed regulation stage, the target power supply power of the target motor in the power supplement stage can be determined based on the predetermined peak power of the power battery. For example, any power less than or equal to the predetermined peak power can be used as the target power supply power. As a preferred embodiment, the predetermined peak power can be used as the target power supply power, so that the peak power of the power battery can be fully utilized for speed regulation of the target motor, effectively shortening the speed regulation time of the target motor, thereby shortening the time of vehicle power reduction or power interruption, and further improving the smoothness of gear shifting.

[0087] In a feasible implementation manner, determining the target power supply power based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery includes:

[0088] Determining the required power of the target motor in the torque compensation stage based on the driving parameters in the current gear and the transmission parameters in the target gear;

[0089] The target power supply power is determined based on the relationship between the required power and the predetermined peak power.

[0090] Specifically, the required power may be the power required to be provided to the target motor when the torque compensation demand of the target motor is fully met.

[0091] During implementation, the required power of the target motor in the torque compensation stage can be determined based on the driving parameters of the vehicle in the current gear and the transmission parameters in the target gear. For example, the required power of the target motor in the torque compensation stage can be determined based on the driving parameters in the current gear, the transmission parameters in the target gear, and the target correspondence. The target correspondence may include a predetermined correspondence between the driving parameters in the current gear, the transmission parameters in the target gear, and the required power. For example, the target correspondence may be a function model or a machine learning model, etc., so that the required power of the target motor in the torque compensation stage can be determined quickly and effectively.

[0092] Among them, the required power of the target motor in the torque compensation stage can be compared with the predetermined peak power of the power battery, and the target power supply power of the target motor in the torque compensation stage can be further determined based on the size relationship between the two, thereby effectively ensuring the validity of the determination result of the target power supply power.

[0093] In a feasible implementation manner, the driving parameter includes the wheel end torque of the vehicle and the speed of the target motor, and the transmission parameter includes a gearbox ratio;

[0094] The determining the required power of the target motor in the torque compensation stage based on the driving parameters in the current gear and the transmission parameters in the target gear includes:

[0095] Determining the required torque of the target motor in the torque compensation phase based on the wheel end torque of the vehicle in the current gear and the gearbox speed ratio in the target gear;

[0096] The required power is determined based on the required torque and the speed of the target motor in the current gear.

[0097] Specifically, the wheel end torque of the vehicle and the speed of the target motor in the current gear can be obtained through real-time detection, and the transmission ratio in the target gear can be determined based on the target gear and a predetermined correspondence between the gear and the transmission ratio.

[0098] The target correspondence may include a first correspondence and a second correspondence. The first correspondence may be used to characterize the correspondence between the wheel end torque of the vehicle in the current gear, the gearbox ratio in the target gear, and the required torque of the target motor in the torque compensation phase. For example, the first correspondence may be as shown in formula (3):

[0099] T mot_d =T whl_c / (i g_t *η) (3)

[0100] Where, T mot_d is the required torque of the target motor in the torque compensation stage, Twhl_c is the wheel end torque in the current gear, i g_t is the gearbox ratio at the target gear, and η is the transmission efficiency of the gearbox.

[0101] In practice, the wheel end torque of the vehicle in the current gear and the gearbox ratio in the target gear can be substituted into equation (3), so that the required torque of the target motor in the torque compensation stage can be determined quickly and effectively.

[0102] The second corresponding relationship can be used to characterize the corresponding relationship between the required torque of the target motor in the torque compensation phase, the speed of the target motor in the current gear, and the required power of the target motor in the torque compensation phase. For example, the second corresponding relationship can be shown as formula (4):

[0103] P shift =T mot_d *N mot_c / 9550 (4)

[0104] Where P shift is the required power of the target motor in the torque compensation stage, N mot_c It is the speed of the target motor in the current gear.

[0105] In implementation, the required torque of the target motor in the torque compensation stage and the speed of the target motor in the current gear can be substituted into equation (4), so that the required power of the target motor in the torque compensation stage can be determined quickly and effectively.

[0106] In a feasible implementation manner, determining the target power supply power based on the magnitude relationship between the required power and the predetermined peak power includes:

[0107] If the required power is less than the predetermined peak power, the required power is used as the target power supply power;

[0108] If the required power is greater than or equal to the predetermined peak power, the predetermined peak power is used as the target power supply power.

[0109] Specifically, if the required power of the target motor in the torque compensation stage is less than the predetermined peak power of the power battery, the required power can be used as the target power supply power of the target motor in the torque compensation stage, thereby effectively meeting the power demand of the target motor in the torque compensation stage, so that the target motor has sufficient capacity for torque compensation, further improving the smoothness of the gear shifting process.

[0110] If the required power of the target motor in the torque compensation stage is greater than or equal to the predetermined peak power of the power battery, the predetermined peak power of the power battery can be used as the target power supply power to avoid over-power operation of the power battery, thereby maximizing the smoothness of the gear shifting process while ensuring the effective operation of the power battery.

[0111] In a feasible implementation manner, adjusting the target output power of the power battery to the target motor in the power replenishment stage based on the target power supply power and the peak power output duration of the power battery includes:

[0112] If the peak power output duration of the power battery is less than the predetermined duration limit, the

[0113] If the peak power output duration of the power battery is greater than or equal to the predetermined duration limit, the continuous power of the power battery is used as the target output power.

[0114] Specifically, the predetermined duration limit may be the maximum peak power output duration corresponding to the predetermined peak power. In implementation, during the operation of the power battery, the peak power output duration of the power battery may be counted in real time, that is, whether or not it is in the power supplementation stage, the peak power output duration of the power battery needs to be counted. It is understandable that if the peak power used in different peak power operation stages is different, the equivalent duration corresponding to the adopted peak power may be determined based on the maximum peak power output duration corresponding to the adopted peak power and the maximum peak power output duration corresponding to the predetermined peak power, and the equivalent duration is accumulated to obtain the peak power output duration. In addition, if the peak power output duration does not reach the predetermined duration limit when entering the power supplementation stage, the timing may continue on the basis of the peak power output duration during the power supplementation stage. If the peak power output duration has reached the predetermined duration limit when entering the power supplementation stage, it indicates that the peak power of the power battery cannot provide additional power to the target motor for speed regulation or torque compensation during the shifting stage.

[0115] It is understood that the peak power output duration can also be reset based on the duration of the power battery running at continuous power or the output power, etc. For example, when the power battery is running at continuous power, the differential power of the power battery can be integrated to obtain the differential power, and when the differential power reaches a predetermined power, the peak power output duration is reset. The differential power can be the difference between the continuous power of the power battery and the actual output power.

[0116] During implementation, during the power replenishment stage, if the peak power output duration of the power battery is less than the predetermined duration limit, the target supply power can be used as the target output power of the power battery to the target motor; if the peak power output duration of the power battery is greater than or equal to the predetermined duration limit, the continuous power of the power battery can be used as the target output power of the power battery to the target motor to avoid over-power operation of the power battery. This can ensure the effective operation of the power battery while meeting the power demand of the target motor in the power replenishment stage to the greatest extent, thereby improving the smoothness of the gear shifting process.

[0117] In a feasible implementation manner, the peak power output duration includes an equivalent cumulative value of the operating duration of the power battery at the peak power;

[0118] The process of determining the peak power output duration includes:

[0119] Based on the actual output power of each time interval when the power battery operates at peak power, the target step length corresponding to each time interval is determined respectively; wherein the duration of each time interval is a predetermined duration, and the target step length corresponding to the time interval is positively correlated with the actual output power of the time interval;

[0120] The cumulative sum of the target step lengths corresponding to the time intervals is used as the peak power output duration.

[0121] Specifically, the peak power output duration of the power battery can represent the equivalent cumulative value of the operating duration of the power battery at peak power.

[0122] In implementation, in the process of timing the peak power output duration, the peak power output duration can be accumulated according to the time interval of the predetermined duration. The predetermined duration can be set according to the timing accuracy requirement. The shorter the predetermined duration, the higher the timing accuracy of the peak power output duration. For example, the predetermined duration can be set to 0.01s.

[0123] For any time interval, the target step length corresponding to the time interval can be determined according to the actual output power of the power battery in the time interval, wherein the target step length can be positively correlated with the actual output power, that is, the larger the actual output power, the larger the target step length, and the smaller the actual output power, the smaller the target step length. It can be understood that the unit of the target step length can be the same as the unit of the actual duration, or it can be different from the unit of the actual duration. It can be set according to actual needs to ensure that the timing units of the target step lengths in different time intervals are the same. For example, for a time interval of 0.01s, the target step length can be 1 or 5, etc.

[0124] For each time interval when the power battery operates at peak power, the target step lengths corresponding to each time interval can be accumulated to obtain the peak power output duration of the power battery. It can be understood that the unit of the predetermined duration limit value can be an equivalent duration limit value that is the same as the unit of the target step length. For example, the predetermined duration limit value can be the product of the target step length of the predetermined peak power in a time interval and the number of intervals corresponding to the predetermined peak power. The number of intervals corresponding to the predetermined peak power can be the ratio of the maximum peak power output duration corresponding to the predetermined peak power to the predetermined duration of the time interval. In addition, the equivalent duration limits corresponding to different peak powers can be the same to ensure the reliability of the timing result of the peak power output duration.

[0125] In a feasible implementation manner, the determining the target step size corresponding to each time interval based on the actual output power of each time interval when the power battery operates at the peak power includes:

[0126] Based on the actual output power of the power battery in the time interval, the first step length corresponding to the first peak power, and the second step length corresponding to the second peak power, the target step length corresponding to the time interval is determined by interpolation.

[0127] Specifically, the first peak power and the second peak power can both be the peak powers that can be output by the power battery. In implementation, the first step length corresponding to the first peak power and the second step length corresponding to the second peak power can be determined based on the maximum peak power output duration corresponding to the first peak power and the maximum peak power output duration corresponding to the second peak power, so that the equivalent duration limit corresponding to the first peak power is equal to the equivalent duration limit corresponding to the second peak power. For example, taking the first peak power of 100KW and the corresponding maximum peak power output duration of 10s, and the second peak power of 120KW and the maximum peak power output duration of 2s as an example, the target step lengths and equivalent duration limits corresponding to the first peak power and the second peak power can be as shown in Table 1:

[0128] Table 1

[0129] Peak Power Target step length Maximum peak power output duration Equivalent time limit 100kW 1 10s 1000 120kW 5 2s 1000

[0130] During implementation, in the process of timing the peak power output duration, for any time interval, the target step length corresponding to the time interval can be determined by linear interpolation based on the actual output power of the power battery in the time interval, as well as the first step length corresponding to the first peak power and the second step length corresponding to the second peak power. This can effectively prevent the power battery from operating at overpower when the output power of the power battery fluctuates, and can ensure the effective operation of the power battery while making full use of the peak power of the power battery to provide additional power for the target motor to adjust the speed or compensate the torque.

[0131] The specific implementation process of the shift control method of this embodiment is described below by way of an optional implementation. Figure 2 As shown, the shift control method of this embodiment includes:

[0132] S201, upon receiving a gear shift instruction from a vehicle, determining a current gear shift type;

[0133] S202, determining whether the current gear shift type is a power upshift, if so, executing step S203; if not, executing step S205;

[0134] S203, determining a target power supply power of the torque phase, and requesting power from the power battery based on the target power supply power to perform torque alternation;

[0135] S204, adjusting the speed in the speed phase and executing step S214;

[0136] S205, determining whether the current gear shift type is a power downshift, if so, executing step S206; if not, executing step S208;

[0137] S206, using the predetermined peak power of the power battery as the target power supply power of the speed phase to request power from the power battery to perform speed regulation;

[0138] S207, perform torque alternation in the torque phase and execute step S214;

[0139] S208, determining whether the current gear shift type is non-power upshift, if yes, executing step S209; if no, executing step S211;

[0140] S209, regulating the speed in the speed phase;

[0141] S210, perform torque alternation in the torque phase and execute step S214;

[0142] S211, determining whether the current gear shift type is non-power downshift, if so, executing step S212; if not, indicating a software or hardware failure, an alarm is issued;

[0143] S212, performing torque alternation in the torque phase;

[0144] S213, using the predetermined peak power of the power battery as the target power supply power of the speed phase to request power from the power battery to perform speed regulation;

[0145] S214: Execute clutch locking and complete gear shifting.

[0146] Exemplary Devices

[0147] In an exemplary embodiment of the present specification, a shift control device is also provided, such as Figure 3 As shown, including:

[0148] The first processing module 301 is used to determine the current gear shift type when receiving a gear shift instruction of the vehicle;

[0149] The second processing module 302 is used to determine the target power supply power of the target motor in the power replenishment stage based on the power replenishment stage corresponding to the current shift type if the target motor of the vehicle has a power replenishment demand under the current shift type; the target power supply power is used to represent the power that the power battery of the vehicle needs to provide to the target motor when running at peak power;

[0150] The third processing module 303 is used to adjust the target output power of the power battery to the target motor in the power supplement phase based on the target power supply power and the peak power output duration of the power battery.

[0151] In a feasible implementation manner, the power supplementation stage is a torque supplementation stage or a speed regulation stage; the second processing module 302 is specifically used for:

[0152] If the power supplement stage is the torque supplement stage, the target power supply power is determined based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery;

[0153] If the power supplement stage is the speed regulation stage, the target power supply power is determined based on the predetermined peak power of the power battery.

[0154] In a feasible implementation manner, the second processing module 302 is specifically configured to:

[0155] Determining the required power of the target motor in the torque compensation stage based on the driving parameters in the current gear and the transmission parameters in the target gear;

[0156] The target power supply power is determined based on the relationship between the required power and the predetermined peak power.

[0157] In a feasible implementation manner, the driving parameters include the wheel end torque of the vehicle and the speed of the target motor, and the transmission parameters include the gearbox ratio; the second processing module 302 is specifically used for:

[0158] Determining the required torque of the target motor in the torque compensation phase based on the wheel end torque of the vehicle in the current gear and the gearbox speed ratio in the target gear;

[0159] The required power is determined based on the required torque and the speed of the target motor in the current gear.

[0160] In a feasible implementation, in a feasible implementation, the second processing module 302 is specifically used for:

[0161] If the required power is less than the predetermined peak power, the required power is used as the target power supply power;

[0162] If the required power is greater than or equal to the predetermined peak power, the predetermined peak power is used as the target power supply power.

[0163] In a feasible implementation manner, the third processing module 303 is specifically used for:

[0164] If the peak power output duration of the power battery is less than the predetermined duration limit, the target power supply power is used as the target output power;

[0165] If the peak power output duration of the power battery is greater than or equal to the predetermined duration limit, the continuous power of the power battery is used as the target output power.

[0166] In a feasible implementation manner, the peak power output duration includes an equivalent cumulative value of the operating duration of the power battery at the peak power; the third processing module 303 is further used for:

[0167] Based on the actual output power of each time interval when the power battery operates at peak power, the target step length corresponding to each time interval is determined respectively; wherein the duration of each time interval is a predetermined duration, and the target step length corresponding to the time interval is positively correlated with the actual output power of the time interval;

[0168] The cumulative sum of the target step lengths corresponding to the time intervals is used as the peak power output duration.

[0169] In a feasible implementation manner, the third processing module 303 is specifically used for:

[0170] Based on the actual output power of the power battery in the time interval, the first step length corresponding to the first peak power, and the second step length corresponding to the second peak power, the target step length corresponding to the time interval is determined by interpolation.

[0171] The shift control device provided in this embodiment belongs to the same application concept as the shift control method provided in the above embodiments of this application, and can execute the shift control method provided in any of the above embodiments of this application, and has the corresponding functional modules and beneficial effects of executing the shift control method. For technical details not fully described in this embodiment, please refer to the specific processing content of the shift control method provided in the above embodiments of this application, and will not be repeated here.

[0172] Example Vehicles

[0173] In an exemplary embodiment of the present specification, a vehicle is also provided, comprising a power battery, a motor, and a shift control device as described in any one of the above embodiments.

[0174] Exemplary computer program products and storage media

[0175] In addition to the above-mentioned methods and devices, the shift control method provided in the embodiments of the present specification may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the shift control method according to various embodiments of the present specification described in the above "Exemplary Method" section of the present specification.

[0176] The computer program product can be written in any combination of one or more programming languages ​​to write program codes for executing the operations of the embodiments of this specification, and the programming languages ​​include object-oriented programming languages, such as Java, C++, etc., and also include conventional procedural programming languages, such as "C" language or similar programming languages.

[0177] In addition, an embodiment of the present specification also provides a computer-readable storage medium on which a computer program is stored, and the computer program is executed by a processor to execute the steps of the shift control method according to various embodiments of the present specification described in the above "Exemplary Method" section of the present specification.

[0178] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this specification can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0179] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0180] The above-mentioned embodiments only express several implementation methods of this specification, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the solutions provided by the embodiments of this specification. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of this specification, which all belong to the protection scope of this specification. Therefore, the protection scope of the patent of this specification shall be based on the attached claims.

Claims

1. A gear shift control method, characterized in that: include: Upon receiving a gear shift command from the vehicle, determining a current gear shift type; If the target motor of the vehicle has a power replenishment demand under the current gear shift type, determining a target power supply power of the target motor in the power replenishment stage based on the power replenishment stage corresponding to the current gear shift type; The target power supply power is used to represent the power that the power battery of the vehicle needs to provide to the target motor when running at peak power; Based on the target power supply power and the peak power output duration of the power battery, the target output power of the power battery to the target motor during the power supplement phase is adjusted.

2. The method according to claim 1, characterized in that The power supplement stage is a torque supplement stage or a speed regulation stage; The determining, based on the power supplement stage corresponding to the current gear shift type, the target power supply power of the target motor in the power supplement stage includes: If the power supplement stage is the torque supplement stage, the target power supply power is determined based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery; If the power supplement stage is the speed regulation stage, the target power supply power is determined based on the predetermined peak power of the power battery.

3. The method according to claim 2, characterized in that The determining the target power supply power based on the driving parameters of the vehicle in the current gear, the transmission parameters in the target gear, and the predetermined peak power of the power battery includes: Determining the required power of the target motor in the torque compensation stage based on the driving parameters in the current gear and the transmission parameters in the target gear; The target power supply power is determined based on the relationship between the required power and the predetermined peak power.

4. The method according to claim 3, characterized in that: The driving parameters include the wheel end torque of the vehicle and the speed of the target motor, and the transmission parameters include the gearbox ratio; The determining the required power of the target motor in the torque compensation stage based on the driving parameters in the current gear and the transmission parameters in the target gear includes: Determining the required torque of the target motor in the torque compensation phase based on the wheel end torque of the vehicle in the current gear and the gearbox speed ratio in the target gear; The required power is determined based on the required torque and the speed of the target motor in the current gear.

5. The method according to claim 3, characterized in that: The determining the target power supply power based on the magnitude relationship between the required power and the predetermined peak power includes: If the required power is less than the predetermined peak power, the required power is used as the target power supply power; If the required power is greater than or equal to the predetermined peak power, the predetermined peak power is used as the target power supply power.

6. The method according to claim 1, characterized in that The step of adjusting the target output power of the power battery to the target motor in the power supplement phase based on the target power supply power and the peak power output duration of the power battery includes: If the peak power output duration of the power battery is less than the predetermined duration limit, the target power supply power is used as the target output power; If the peak power output duration of the power battery is greater than or equal to the predetermined duration limit, the continuous power of the power battery is used as the target output power.

7. The method according to any one of claims 1 to 6, characterized in that: The peak power output duration includes an equivalent cumulative value of the operating duration of the power battery at peak power; The process of determining the peak power output duration includes: Based on the actual output power of each time interval when the power battery operates at peak power, the target step length corresponding to each time interval is determined respectively; wherein the duration of each time interval is a predetermined duration, and the target step length corresponding to the time interval is positively correlated with the actual output power of the time interval; The cumulative sum of the target step lengths corresponding to the time intervals is used as the peak power output duration.

8. The method according to claim 7, characterized in that The determining of the target step length corresponding to each time interval based on the actual output power of each time interval when the power battery operates at the peak power includes: Based on the actual output power of the power battery in the time interval, the first step length corresponding to the first peak power, and the second step length corresponding to the second peak power, the target step length corresponding to the time interval is determined by interpolation.

9. A gear shift control device, characterized in that: include: A first processing module, configured to determine a current gear shift type upon receiving a gear shift instruction from a vehicle; A second processing module is used to determine the target power supply power of the target motor in the power replenishment stage based on the power replenishment stage corresponding to the current shift type if the target motor of the vehicle has a power replenishment demand under the current shift type; The target power supply power is used to represent the power that the power battery of the vehicle needs to provide to the target motor when running at peak power; The third processing module is used to adjust the target output power of the power battery to the target motor in the power supplement phase based on the target power supply power and the peak power output duration of the power battery.

10. A vehicle, characterized in that: It comprises a power battery, a motor and the shift control device as claimed in claim 9.

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