Electric automobile gear shifting control method and system

Abstract

The invention discloses a gear shifting control method and system for an electric vehicle, and the method comprises the steps: determining a gear adjustment type when a gear adjustment request is received in a driving process; according to the driving data and the gear adjustment type of the electric vehicle, the target torque of the motor is determined; determining a torque adjustment gradient according to the driving data of the electric vehicle, the current required torque of the driver, the required torque of the driver at the last moment and the gear adjustment type; and the motor control unit is called to adjust the motor torque of the electric vehicle according to the current torque, the target torque, the torque adjustment gradient and the gear adjustment type of the motor of the electric vehicle, so that gear shifting operation is completed, the impact feeling of the fuel vehicle during gear shifting can be simulated during gear shifting, and therefore the driving experience of a driver is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a gear shift control method and system for an electric vehicle. Background Art

[0002] Electric vehicles lack a gasoline engine and transmission, relying instead on batteries and electric motors. Without the noise of an engine and the strain of a transmission, electric vehicles are much quieter than gasoline vehicles. Most electric vehicles use a single-speed gearbox, eliminating the need for shifting. This makes them smoother than gasoline vehicles, and their high-powered motors deliver exceptional acceleration. Consequently, electric vehicles often offer customers the impression of quick, quiet, and smooth driving, but they lack the driving pleasure of gasoline vehicles.

[0003] To provide customers with more personalized products, automakers are developing simulated engine sounds and instrument clusters that combine the power of electric vehicles with the roar of gasoline-powered vehicles, hoping to provide drivers with an ultimate driving experience. However, electric vehicles offer relatively smooth acceleration, while gasoline-powered vehicles have a less impactful shifting experience, failing to meet drivers' expectations for the driving pleasure of gasoline-powered vehicles. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a method and system for controlling gear shifting in an electric vehicle, which can solve the problem of poor impact feeling during gear shifting in the electric vehicle in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: An embodiment of the present invention provides a shift control method for an electric vehicle, wherein the method includes: When a gear adjustment request is received during driving, determining a gear adjustment type, wherein the gear adjustment type includes: upshift and downshift; Determining the target torque of the motor according to driving data of the electric vehicle and the gear adjustment type; wherein the driving data includes: a vehicle speed signal, an accelerator pedal signal, and a current torque of the motor; Determining a torque adjustment gradient based on driving data of the electric vehicle, a current torque demanded by a driver, a torque demanded by the driver at a previous moment, and a gear adjustment type; The motor control unit is called to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient and the gear adjustment type to complete the gear shifting operation.

[0006] Optionally, the step of determining the target torque of the motor according to the driving data of the electric vehicle and the gear adjustment type includes: When the gear adjustment type is upshifting, determining a target torque of the motor according to a speed signal of the electric vehicle and a current torque of the motor; When the gear adjustment type is downshifting, the target torque of the motor is determined according to the vehicle speed signal of the electric vehicle and the accelerator pedal signal.

[0007] Optionally, the step of determining the torque adjustment gradient according to the driving data of the electric vehicle, the current torque required by the driver, the torque required by the driver at the last moment, and the gear adjustment type includes: When the gear adjustment type is upshifting, determining a first descending gradient for adjusting the current torque of the motor to the target torque of the motor according to the accelerator pedal signal and the torque required by the driver at the last moment; A first calibration value is determined based on the accelerator pedal signal and the torque required by the driver at the previous moment, and a second calibration value is determined based on the vehicle speed signal and the torque required by the driver at the previous moment. The product of the first calibration value and the second calibration value is determined as a first rising gradient for adjusting from the target torque of the motor to the torque currently required by the driver.

[0008] Optionally, the step of determining the torque adjustment gradient according to the driving data of the electric vehicle, the current torque required by the driver, the torque required by the driver at the last moment, and the gear adjustment type includes: When the gear adjustment type is downshifting, determining whether the current torque of the electric vehicle motor is greater than the target torque of the motor; If yes, determining a third calibration value based on the accelerator pedal signal and the torque required by the driver at the last moment; The product of the third calibration value and the vehicle speed indicated by the vehicle speed signal is determined as a second decreasing gradient for adjusting the current torque of the motor to the current torque required by the driver.

[0009] Optionally, the step of calling a motor control unit to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient, and the gear adjustment type to complete the gear shift operation includes: In the case where the gear adjustment type is upshifting, determining a motor torque gradient limiting rule, wherein the elevator torque gradient limiting rule includes: the first ascending gradient is a maximum limiting value, and the first descending gradient is a minimum limiting value; The motor control unit is called to adjust the torque of the electric vehicle motor from the current torque to the target torque according to the motor torque gradient limitation rule, and then adjust it from the target torque to the driver's current required torque to complete the gear shifting operation.

[0010] Optionally, the step of calling a motor control unit to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient, and the gear adjustment type to complete the gear shift operation includes: When the gear adjustment type is downshifting, the motor control unit is called to adjust the torque of the electric vehicle motor from the current torque to the target torque with the second descending gradient as the minimum limit value to complete the gear shifting operation.

[0011] An embodiment of the present invention further provides an electric vehicle shift control system, wherein the system comprises: an input signal processing module, configured to determine a gear adjustment type upon receiving a gear adjustment request during driving, wherein the gear adjustment type includes: upshifting and downshifting; a target torque calculation module, configured to determine a target torque of the motor based on driving data of the electric vehicle and a gear adjustment type; wherein the driving data includes a vehicle speed signal, an accelerator pedal signal, and a current torque of the motor; a torque gradient calculation module, configured to determine a torque adjustment gradient based on driving data of the electric vehicle, a current torque demanded by the driver, a torque demanded by the driver at a previous moment, and a gear adjustment type; The torque gradient control module is used to call the motor control unit to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient and the gear adjustment type to complete the gear shifting operation.

[0012] Optionally, the target torque calculation module includes: A first submodule is configured to determine a target torque of the motor according to a speed signal of the electric vehicle and a current torque of the motor when the gear adjustment type is upshifting; The second submodule is configured to determine a target torque of the motor according to a vehicle speed signal of the electric vehicle and the accelerator pedal signal when the gear adjustment type is downshifting.

[0013] Optionally, the torque gradient calculation module includes: an upshift torque gradient calculation submodule, configured to determine, when the gear adjustment type is upshift, a first descending gradient for adjusting the current torque of the motor to the target torque of the motor based on the accelerator pedal signal and the torque requested by the driver at the last moment; A first calibration value is determined based on the accelerator pedal signal and the torque required by the driver at the previous moment, and a second calibration value is determined based on the vehicle speed signal and the torque required by the driver at the previous moment. The product of the first calibration value and the second calibration value is determined as a first rising gradient for adjusting from the target torque of the motor to the torque currently required by the driver.

[0014] Optionally, the torque gradient calculation module includes: The downshift torque gradient calculation submodule is used to determine whether the current torque of the electric vehicle motor is greater than the target torque of the motor when the gear adjustment type is downshift; if so, determine a third calibration value based on the accelerator pedal signal and the torque required by the driver at the last moment; and multiply the third calibration value by the vehicle speed indicated by the vehicle speed signal to determine the second downshift gradient for adjusting from the current torque of the motor to the torque currently required by the driver.

[0015] Optionally, the torque gradient control module includes: a first control submodule, configured to determine a motor torque gradient limiting rule when the gear adjustment type is upshifting, wherein the elevator torque gradient limiting rule includes: the first ascending gradient is a maximum limiting value, and the first descending gradient is a minimum limiting value; The second control submodule is used to call the motor control unit to adjust the torque of the electric vehicle motor from the current torque to the target torque according to the motor torque gradient limitation rule, and then adjust it from the target torque to the driver's current required torque to complete the gear shifting operation.

[0016] Optionally, the torque gradient control module includes: The third control submodule is used to call the motor control unit to adjust the torque of the electric vehicle motor from the current torque to the target torque with the second descending gradient as the minimum limit value when the gear adjustment type is downshifting, so as to complete the gear shifting operation.

[0017] The electric vehicle shift control scheme provided by an embodiment of the present invention determines the gear adjustment type upon receiving a gear adjustment request during driving; determines the target torque of the motor based on the electric vehicle's driving data and the gear adjustment type; determines the torque adjustment gradient based on the electric vehicle's driving data, the driver's current torque demand, the driver's torque demand at the previous moment, and the gear adjustment type; and calls a motor control unit to adjust the electric vehicle's motor torque based on the electric vehicle's current torque, target torque, torque adjustment gradient, and gear adjustment type to complete the gear shift operation. The electric vehicle shift control scheme provided by an embodiment of the present invention uses software to control the drive motor to generate impact without adding hardware, enhancing the impact felt during electric vehicle gear shifts to simulate the shifting sensation of a fuel vehicle, thereby improving driving pleasure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 1 is a flow chart showing a method for controlling electric vehicle shifting according to an embodiment of the present application; Figure 2 is an overall control logic diagram of an electric vehicle shift control system according to an embodiment of the present application; Figure 3 is a torque control diagram showing an electric vehicle shifting up in an embodiment of the present application; Figure 4 is a torque control diagram showing a downshift of an electric vehicle according to an embodiment of the present application; Figure 5 1 is a structural block diagram of an electric vehicle shift control system according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0020] The following detailed description is an exemplary description and is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0021] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0022] To enhance the driving pleasure of pure electric vehicles, they simulate the driving feel of fuel-powered vehicles. Car manufacturers typically employ methods such as simulating "engine noise" and "engine speed." While there's an "engine roar" and "engine speed" displayed on the instrument panel, the lack of the shifting feel of a traditional fuel-powered vehicle prevents the driver from experiencing a more complete driving experience. The electric vehicle shift control scheme provided by the present invention simulates the shifting feel of a fuel-powered vehicle by controlling the drive motor through software without adding hardware. This shift control scheme, when an upshift request is received during normal driving, rapidly reduces the motor torque to negative torque, then rapidly increases the motor torque from negative torque to the driver's requested torque. This control simulates the shifting feel of a fuel-powered vehicle by controlling the gradient of the torque reduction and increase process. If the gradient of the motor torque reduction and increase is too large, a shock will be generated. The motor speed and torque shock are used to simulate the shifting feel of a fuel-powered vehicle. When downshifting, the motor torque is rapidly reduced to negative torque, and the gradient of the torque reduction is controlled to simulate the shifting feel of a fuel-powered vehicle.

[0023] The electric vehicle shift control scheme provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0024] As attached Figure 1 As shown, the electric vehicle shift control method according to the embodiment of the present application includes the following steps: Step 101: When a gear adjustment request is received during driving, the gear adjustment type is determined.

[0025] Among them, the gear adjustment types include: upshift and downshift.

[0026] The electric vehicle shift control solution provided in the embodiment of the present application can be applied to the central control processor in the electric vehicle. The electric vehicle shift control computer program is set in the storage device of the electric vehicle. When executing, the processor executes the corresponding computer program to realize the shift control of the electric vehicle.

[0027] Step 102: Determine the target torque of the motor according to the driving data of the electric vehicle and the gear adjustment type.

[0028] Driving data includes vehicle speed signals, accelerator pedal signals, and the current motor torque. Different driving data can be acquired through corresponding interfaces or sensors, or the corresponding monitoring device can proactively report the electric vehicle's driving data to the processor. The vehicle speed signal can represent the electric vehicle's speed, and the accelerator pedal signal can represent the throttle opening. The current motor torque can be a filtered value.

[0029] The target torque of the motor is divided into a target torque for upshifting and a target torque for downshifting. In an optional embodiment, based on the driving data of the electric vehicle and the gear adjustment type, the target torque of the motor can be determined as follows: When the gear adjustment type is upshifting, the target torque of the motor is determined based on the vehicle speed signal of the electric vehicle and the current torque of the motor; for example, the target torque of the motor when upshifting is a calibrated MAP, i.e., a mapping coordinate, where the X-axis of the MAP is the vehicle speed and the Y-axis is the filtered current torque of the motor.

[0030] When the gear adjustment type is downshifting, the motor's target torque is determined based on the electric vehicle's speed signal and the accelerator pedal signal. For example, the motor's target torque during downshifting can also be a calibrated map, where the X-axis represents vehicle speed and the Y-axis represents throttle position.

[0031] Step 103: Determine the torque adjustment gradient based on the driving data of the electric vehicle, the current torque required by the driver, the torque required by the driver at the last moment, and the gear adjustment type.

[0032] The torque adjustment gradient can be set as a fixed value by the user, or it can be determined based on a combination of multiple factors, including the electric vehicle's driving data and the current torque demand. When this is determined based on multiple factors, the torque adjustment gradient calculation logic for different gear adjustment types differs.

[0033] In an optional embodiment, the torque adjustment gradient may be determined as follows based on the driving data of the electric vehicle, the current torque demanded by the driver, the torque demanded by the driver at the last moment, and the gear adjustment type: When the gear adjustment type is upshifting, the first descending gradient from the current torque of the motor to the target torque of the motor is determined based on the accelerator pedal signal and the torque required by the driver at the last moment; the first calibration value is determined based on the accelerator pedal signal and the torque required by the driver at the last moment, and the second calibration value is determined based on the vehicle speed signal and the torque required by the driver at the last moment, and the product of the first calibration value and the second calibration value is determined as the first ascending gradient from the target torque of the motor to the torque currently required by the driver.

[0034] When the gear adjustment type is downshift, determine whether the current torque of the electric vehicle motor is greater than the target torque of the motor; if so, determine a third calibration value based on the accelerator pedal signal and the torque required by the driver at the last moment; and multiply the third calibration value by the vehicle speed indicated by the vehicle speed signal to determine a second descending gradient for adjusting from the current torque of the motor to the torque currently required by the driver.

[0035] This optional method of determining the torque adjustment gradient has a higher matching degree with the user's expectation and the current state of the electric vehicle and is more reliable.

[0036] Step 104: calling the motor control unit to adjust the motor torque of the electric vehicle according to the current torque, target torque, torque adjustment gradient and gear adjustment type of the electric vehicle motor to complete the gear shifting operation.

[0037] After determining the current torque, target torque, torque adjustment gradient, and gear adjustment type of the electric vehicle motor, the following motor torque adjustment rules can be followed: During an upshift, if the current motor torque (i.e., the motor's current torque) is greater than the target motor torque (i.e., the motor's target torque), the motor torque can be controlled from the current motor torque to the target motor torque, creating a shift-like impact by controlling the motor torque's downward gradient. The motor torque then increases from the target motor torque to the driver's requested torque (i.e., the driver's current requested torque), creating a shift-like impact by controlling the motor torque's upward gradient. Alternatively, based on actual driving experience, the motor torque can be controlled to create a single impact, either during the transition from the current motor torque to the target motor torque or during the transition from the target motor torque to the driver's requested torque. If the current motor torque is less than or equal to the target motor torque during an upshift, the motor torque increases from the target motor torque to the driver's requested torque, creating a shift-like impact by controlling the motor torque's upward gradient.

[0038] When downshifting, if the current motor torque is greater than the target motor torque, the motor torque can be controlled from the current motor torque to the target motor torque, and an impact feeling similar to that during gear shifting is generated by controlling the torque decrease gradient of the motor; if the current motor torque is less than or equal to the target motor torque when downshifting, the current motor torque is maintained without being controlled.

[0039] Based on the above motor torque adjustment rules, a torque adjustment gradient can be further combined to achieve a more impactful motor torque adjustment. In an optional embodiment, the motor control unit is called to adjust the motor torque of the electric vehicle based on the current torque, target torque, torque adjustment gradient, and gear adjustment type of the electric vehicle motor to complete the gear shift operation as follows: When the gear adjustment type is upshifting, the motor torque gradient limitation rule is determined; the motor control unit is called to adjust the torque of the electric vehicle motor from the current torque to the target torque, and then from the target torque to the driver's current required torque according to the motor torque gradient limitation rule to complete the gear shifting operation.

[0040] The elevator torque gradient limiting rule includes: the first ascending gradient is the maximum limiting value, and the first descending gradient is the minimum limiting value.

[0041] When the gear adjustment type is downshifting, the motor control unit is called to adjust the torque of the electric vehicle motor from the current torque to the target torque with the second descending gradient as the minimum limit value to complete the gear shifting operation.

[0042] This method of optionally adjusting the motor torque based on the torque adjustment gradient can make the impact feeling during gear shifting more prominent.

[0043] The electric vehicle shift control method provided by the embodiment of the present application determines the gear adjustment type upon receiving a gear adjustment request during driving; determines the target torque of the motor based on the electric vehicle's driving data and the gear adjustment type; determines the torque adjustment gradient based on the electric vehicle's driving data, the driver's current required torque, the driver's last required torque, and the gear adjustment type; and calls a motor control unit to adjust the electric vehicle's motor torque based on the electric vehicle's current torque, target torque, torque adjustment gradient, and gear adjustment type to complete the gear shift operation. The electric vehicle shift control method provided by the embodiment of the present invention uses software to control the drive motor to generate impact without adding hardware, enhancing the impact sensation during electric vehicle gear shifts to simulate the shifting sensation of a fuel vehicle, thereby improving driving pleasure.

[0044] The following combination Figure 2-Figure 4 , a specific example is used to illustrate the electric vehicle shift control method provided in the embodiment of the present application.

[0045] Figure 2 This is an overall control logic diagram of an electric vehicle shift control system according to an embodiment of the present application. The system includes an input signal processing module for receiving input signals required for control and processing the input signals; a target torque calculation module for calculating the target torque of the motor during upshifting and downshifting; an upshift torque gradient calculation module for controlling the decreasing and increasing gradients of the motor torque during upshifting; a downshift torque gradient calculation module for calculating the decreasing gradient of the motor torque during downshifting; a torque gradient control module for performing gradient limitation on the target torque and the driver's required torque, and sending the finally calculated motor target torque to the motor control unit via a CAN (Controller Area Network) protocol message or an Ethernet signal.

[0046] Figure 3This is the torque control diagram for an electric vehicle upshifting. During an upshift, if the current motor torque Trq_1 is greater than the target motor torque Trq_set_1, the motor torque is controlled from the current motor torque Trq_1 to the target motor torque Trq_set_1, creating a shift-like impact by controlling the motor torque's downward gradient. The motor torque then increases from the target motor torque Trq_set_1 to the driver-requested torque Trq_dem_1, creating a shift-like impact by controlling the motor torque's upward gradient. Alternatively, based on actual driving experience, the torque gradient can be controlled to create a secondary impact, either during the transition from the current motor torque Trq_1 to the target motor torque Trq_set_1 or during the transition from the target motor torque Trq_set_1 to the driver-requested torque Trq_dem_1. If the current motor torque Trq_1 is less than or equal to the target motor torque Trq_set_1 during an upshift, the motor torque increases from the target motor torque Trq_set_1 to the driver-requested torque Trq_dem_1, creating a shift-like impact by controlling the motor torque's upward gradient.

[0047] Figure 4 This is the torque control diagram for downshifting in an electric vehicle. During a downshift, if the current motor torque Trq_2 is greater than the target motor torque Trq_set_2, the motor torque is controlled from the current motor torque Trq_2 to the target motor torque Trq_set_2. This control creates a shift-like impact by decreasing the motor torque gradient. If the current motor torque Trq_2 is less than or equal to the target motor torque Trq_set_2 during a downshift, the current motor torque Trq_2 is maintained, and no control is performed.

[0048] Combine Figure 3 、 Figure 4 After explaining the overall motor torque control logic, the following section describes how each system module calculates the data source, target torque, and torque adjustment gradient (referred to below as the torque gradient) during motor torque control.

[0049] Input signal processing module: The input signals include vehicle speed signal, gear position signal, accelerator pedal signal, driver demand torque, and motor torque. The driver demand torque is processed by low-pass filtering.

[0050] Target torque calculation module: The target torque calculation module calculates the motor's target torque for upshifts and downshifts. The target torque is divided into two types: upshift and downshift. The upshift target torque is a calibrated MAP with vehicle speed on the X-axis and filtered motor torque on the Y-axis. The downshift target torque is a calibrated MAP with vehicle speed on the X-axis and throttle position on the Y-axis.

[0051] Upshift torque gradient calculation module: The upshift torque gradient calculation module is used to calculate Figure 3 The torque gradients in the figure are Trq_Grd_dw_1, the torque down gradient from Trq_1 to Trq_set_1, and Trq_Grd_up_1, the torque up gradient from Trq_set_1 to Trq_dem_1. The torque down gradient Trq_Grd_dw_1 is derived by multiplying a calibrable MAP and a calibrable CURVE. The X-axis of this MAP represents the accelerator pedal and the Y-axis represents the driver's requested torque at the previous moment. The X-axis of the CURVE represents vehicle speed. The torque up gradient Trq_Grd_up_1 from Trq_set_1 to Trq_dem_1 is derived by multiplying two calibrable MAPs: MAP1, where the X-axis represents the accelerator pedal and the Y-axis represents the driver's requested torque at the previous moment; and MAP2, where the X-axis represents the vehicle speed and the Y-axis represents the driver's requested torque at the previous moment.

[0052] Downshift torque gradient calculation module: The downshift torque gradient calculation module is used to calculate Figure 4 The torque gradient in, that is, the torque decrease gradient Trq_Grd_dw_2 from Trq_2 to Trq_set_2.

[0053] The torque reduction gradient Trq_Grd_dw_2 from Trq_2 to Trq_set_2 is obtained by multiplying a calibrable MAP and a calibrable CURVE. The X-axis of the MAP is the accelerator pedal, and the Y-axis is the driver's demand torque at the previous moment. The X-axis of the CURVE is the vehicle speed.

[0054] Torque gradient control module: During upshifting, the driver's requested torque (i.e., the driver's current demand torque as described above) and the calculated target torque Trq_set_1 are limited by Trq_Grd_dw_1 and Trq_Grd_up_1, with Trq_Grd_up_1 serving as the maximum limit and Trq_Grd_dw_1 as the minimum limit.

[0055] During downshifting, the driver's requested torque and the calculated target torque Trq_set_2 are limited by Trq_Grd_dw_2, which is limited as a minimum value.

[0056] The electric vehicle shift control method provided in this specific example, when receiving a shift-up request during normal driving, quickly reduces the motor torque to negative torque, and then quickly increases the motor torque from negative torque to the torque requested by the driver, simulating the shifting feel of a fuel vehicle by controlling the gradient during the torque reduction and increase process. If the gradient during the reduction and increase of the motor torque is too large, an impact will be generated, and the motor speed and torque impact are used to simulate the impact feeling when shifting in a fuel vehicle. When downshifting, the motor torque is quickly reduced to negative torque, and the gradient of the torque reduction is controlled to simulate the shifting feel of a fuel vehicle. It is possible to control the drive motor to produce an impact through software without adding hardware, thereby simulating the shifting feel of a fuel vehicle.

[0057] Figure 5 This is a structural block diagram of an electric vehicle shift control system according to an embodiment of the present application.

[0058] The electric vehicle shift control system of the embodiment of the present application includes: An input signal processing module 501 is configured to determine a gear adjustment type upon receiving a gear adjustment request during driving, wherein the gear adjustment type includes: upshift and downshift; The target torque calculation module 502 is configured to determine the target torque of the motor based on the driving data of the electric vehicle and the gear adjustment type; wherein the driving data includes: a vehicle speed signal, an accelerator pedal signal, and a current torque of the motor; a torque gradient calculation module 503 for determining a torque adjustment gradient based on driving data of the electric vehicle, a current torque demanded by the driver, a torque demanded by the driver at a previous moment, and a gear adjustment type; The torque gradient control module 504 is used to call the motor control unit to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient and the gear adjustment type to complete the gear shifting operation.

[0059] Optionally, the target torque calculation module includes: A first submodule is configured to determine a target torque of the motor according to a speed signal of the electric vehicle and a current torque of the motor when the gear adjustment type is upshifting; The second submodule is configured to determine a target torque of the motor according to a vehicle speed signal of the electric vehicle and the accelerator pedal signal when the gear adjustment type is downshifting.

[0060] Optionally, the torque gradient calculation module includes: an upshift torque gradient calculation submodule, configured to determine, when the gear adjustment type is upshift, a first descending gradient for adjusting the current torque of the motor to the target torque of the motor based on the accelerator pedal signal and the torque requested by the driver at the last moment; A first calibration value is determined based on the accelerator pedal signal and the torque required by the driver at the previous moment, and a second calibration value is determined based on the vehicle speed signal and the torque required by the driver at the previous moment. The product of the first calibration value and the second calibration value is determined as a first rising gradient for adjusting from the target torque of the motor to the torque currently required by the driver.

[0061] Optionally, the torque gradient calculation module includes: The downshift torque gradient calculation submodule is used to determine whether the current torque of the electric vehicle motor is greater than the target torque of the motor when the gear adjustment type is downshift; if so, determine a third calibration value based on the accelerator pedal signal and the torque required by the driver at the last moment; and multiply the third calibration value by the vehicle speed indicated by the vehicle speed signal to determine the second downshift gradient for adjusting from the current torque of the motor to the torque currently required by the driver.

[0062] Optionally, the torque gradient control module includes: a first control submodule, configured to determine a motor torque gradient limiting rule when the gear adjustment type is upshifting, wherein the elevator torque gradient limiting rule includes: the first ascending gradient is a maximum limiting value, and the first descending gradient is a minimum limiting value; The second control submodule is used to call the motor control unit to adjust the torque of the electric vehicle motor from the current torque to the target torque according to the motor torque gradient limitation rule, and then adjust it from the target torque to the driver's current required torque to complete the gear shifting operation.

[0063] Optionally, the torque gradient control module includes: The third control submodule is used to call the motor control unit to adjust the torque of the electric vehicle motor from the current torque to the target torque with the second descending gradient as the minimum limit value when the gear adjustment type is downshifting, so as to complete the gear shifting operation.

[0064] The electric vehicle shift control system provided in an embodiment of the present application determines the gear adjustment type upon receiving a gear adjustment request during driving; determines the target torque of the motor based on the electric vehicle's driving data and the gear adjustment type; determines the torque adjustment gradient based on the electric vehicle's driving data, the driver's current torque demand, the driver's torque demand at the previous moment, and the gear adjustment type; and calls a motor control unit to adjust the electric vehicle's motor torque based on the electric vehicle's current torque, target torque, torque adjustment gradient, and gear adjustment type to complete the gear shift operation. The electric vehicle shift control system provided in an embodiment of the present application uses software to control the drive motor to generate impact without adding hardware, enhancing the impact sensation during electric vehicle gear shifts to simulate the shifting sensation of a fuel vehicle, thereby improving driving pleasure.

[0065] The embodiments of the present application provide Figure 5 The electric vehicle shift control system shown can achieve Figure 1 To avoid repetition, the various processes implemented in the method embodiment are not described here.

[0066] An embodiment of the present application also provides an electronic device that can be used as a deployment device for an electric vehicle shift control system. The electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus.

[0067] The memory is used to store computer programs; the processor is used to implement the electric vehicle shift control process in the above embodiment when executing the program stored in the memory.

[0068] The communication bus mentioned in the terminal can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. This communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is used in the figure, but this does not mean that there is only one bus or only one type of bus.

[0069] The communication interface is used for communication between the above terminal and other devices.

[0070] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage. Alternatively, the memory may be at least one storage device located away from the processor.

[0071] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

[0072] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0073] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A shift control method for an electric vehicle, characterized in that: include: When a gear adjustment request is received during driving, determining a gear adjustment type, wherein the gear adjustment type includes: upshift and downshift; Determining the target torque of the motor according to driving data of the electric vehicle and the gear adjustment type; wherein the driving data includes: a vehicle speed signal, an accelerator pedal signal, and a current torque of the motor; Determining a torque adjustment gradient based on driving data of the electric vehicle, a current torque demanded by a driver, a torque demanded by the driver at a previous moment, and a gear adjustment type; The motor control unit is called to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient and the gear adjustment type to complete the gear shifting operation.

2. The method according to claim 1, characterized in that The step of determining the target torque of the motor according to the driving data of the electric vehicle and the gear adjustment type includes: When the gear adjustment type is upshifting, determining a target torque of the motor according to a speed signal of the electric vehicle and a current torque of the motor; When the gear adjustment type is downshifting, the target torque of the motor is determined according to the vehicle speed signal of the electric vehicle and the accelerator pedal signal.

3. The method according to claim 1, characterized in that The step of determining the torque adjustment gradient according to the driving data of the electric vehicle, the current torque required by the driver, the torque required by the driver at the last moment, and the gear adjustment type includes: When the gear adjustment type is upshifting, determining a first descending gradient for adjusting the current torque of the motor to the target torque of the motor according to the accelerator pedal signal and the torque required by the driver at the last moment; A first calibration value is determined based on the accelerator pedal signal and the torque required by the driver at the previous moment, and a second calibration value is determined based on the vehicle speed signal and the torque required by the driver at the previous moment. The product of the first calibration value and the second calibration value is determined as a first rising gradient for adjusting from the target torque of the motor to the torque currently required by the driver.

4. The method according to claim 3, characterized in that The step of determining the torque adjustment gradient according to the driving data of the electric vehicle, the current torque required by the driver, the torque required by the driver at the last moment, and the gear adjustment type includes: When the gear adjustment type is downshifting, determining whether the current torque of the electric vehicle motor is greater than the target torque of the motor; If yes, determining a third calibration value based on the accelerator pedal signal and the torque required by the driver at the last moment; The product of the third calibration value and the vehicle speed indicated by the vehicle speed signal is determined as a second decreasing gradient for adjusting the current torque of the motor to the current torque required by the driver.

5. The method according to claim 4, characterized in that The step of calling a motor control unit to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient, and the gear adjustment type to complete the gear shift operation includes: In the case where the gear adjustment type is upshifting, determining a motor torque gradient limiting rule, wherein the elevator torque gradient limiting rule includes: the first ascending gradient is a maximum limiting value, and the first descending gradient is a minimum limiting value; The motor control unit is called to adjust the torque of the electric vehicle motor from the current torque to the target torque according to the motor torque gradient limitation rule, and then adjust it from the target torque to the driver's current required torque to complete the gear shifting operation.

6. The method according to claim 4, characterized in that The step of calling a motor control unit to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient, and the gear adjustment type to complete the gear shift operation includes: When the gear adjustment type is downshifting, the motor control unit is called to adjust the torque of the electric vehicle motor from the current torque to the target torque with the second descending gradient as the minimum limit value to complete the gear shifting operation.

7. An electric vehicle shift control system, characterized in that: The system comprises: an input signal processing module, configured to determine a gear adjustment type upon receiving a gear adjustment request during driving, wherein the gear adjustment type includes: upshifting and downshifting; a target torque calculation module, configured to determine a target torque of the motor based on driving data of the electric vehicle and a gear adjustment type; wherein the driving data includes a vehicle speed signal, an accelerator pedal signal, and a current torque of the motor; a torque gradient calculation module, configured to determine a torque adjustment gradient based on driving data of the electric vehicle, a current torque demanded by the driver, a torque demanded by the driver at a previous moment, and a gear adjustment type; The torque gradient control module is used to call the motor control unit to adjust the motor torque of the electric vehicle according to the current torque of the electric vehicle motor, the target torque, the torque adjustment gradient and the gear adjustment type to complete the gear shifting operation.

8. The system according to claim 7, characterized in that The target torque calculation module includes: A first submodule is configured to determine a target torque of the motor according to a speed signal of the electric vehicle and a current torque of the motor when the gear adjustment type is upshifting; The second submodule is configured to determine a target torque of the motor according to a vehicle speed signal of the electric vehicle and the accelerator pedal signal when the gear adjustment type is downshifting.

9. The system according to claim 7, wherein: The torque gradient calculation module includes: an upshift torque gradient calculation submodule, configured to determine, when the gear adjustment type is upshift, a first descending gradient for adjusting the current torque of the motor to the target torque of the motor based on the accelerator pedal signal and the torque requested by the driver at the last moment; A first calibration value is determined based on the accelerator pedal signal and the torque required by the driver at the previous moment, and a second calibration value is determined based on the vehicle speed signal and the torque required by the driver at the previous moment. The product of the first calibration value and the second calibration value is determined as a first rising gradient for adjusting from the target torque of the motor to the torque currently required by the driver.

10. The system according to claim 9, characterized in that The torque gradient calculation module includes: The downshift torque gradient calculation submodule is used to determine whether the current torque of the electric vehicle motor is greater than the target torque of the motor when the gear adjustment type is downshift; if so, determine a third calibration value based on the accelerator pedal signal and the torque required by the driver at the last moment; and multiply the third calibration value by the vehicle speed indicated by the vehicle speed signal to determine the second downshift gradient for adjusting from the current torque of the motor to the torque currently required by the driver.

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