KR-20260062378-A - Method for personalizing regenerative braking of vehicle

KR20260062378AKR 20260062378 AKR20260062378 AKR 20260062378AKR-20260062378-A

Abstract

A method for personalizing regenerative braking of a vehicle is disclosed, comprising: a step of collecting driving data of a vehicle by a controller; a step of determining by the controller that the braking situation of the vehicle is a regenerative braking situation during coasting based on the driving data collected during driving of the vehicle; a step of inputting a brake pedal sensor signal according to the driver's operation of the brake pedal during regenerative braking during coasting to the controller; a step of determining a deceleration rate preferred by the driver based on the brake pedal input value indicated by the brake pedal sensor signal each time the driver operates the brake pedal by the controller; and a step of generating a personalized regenerative braking map based on the determined driver-preferred deceleration rate information by the controller.

Inventors

한욱현

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (16)

A step in which vehicle driving data is collected by a controller; A step in which the braking situation of the vehicle is determined to be a regenerative braking situation during coasting based on driving data collected during vehicle driving by the above controller; A step in which a brake pedal sensor signal corresponding to the driver's operation of the brake pedal is input to the controller during regenerative braking during coasting; A step in which the deceleration rate preferred by the driver is determined based on the brake pedal input value indicated by the brake pedal sensor signal each time the driver operates the brake pedal by the above controller; and A method for personalizing regenerative braking of a vehicle, comprising the step of generating a personalized regenerative braking map based on the determined driver preference deceleration information by the controller.
In claim 1, A step in which a display device is controlled by the above controller to output a message recommending an experience of the regenerative braking personalized mode; and A method for personalizing regenerative braking of a vehicle, further comprising the step of controlling the regenerative operation of a motor by the controller with a regenerative braking torque determined by the personalized regenerative braking map when the driver selects to experience a personalized regenerative braking mode through an input device.
In claim 1, In the step where the deceleration rate preferred by the above driver is determined, The above controller is, A method for personalizing regenerative braking of a vehicle, which determines a deceleration rate preferred by the driver based on a brake pedal input value indicated by a brake pedal sensor signal input during regenerative braking when the vehicle speed is greater than or equal to a set vehicle speed.
In claim 1, The above controller is equipped with a brake pedal map in which the braking deceleration rate is set according to the brake pedal input value, and The step of determining the deceleration rate preferred by the above-mentioned driver is, A step of determining the average value of the peak values of the brake pedal input values indicated by the brake pedal sensor signal each time the driver operates the brake pedal; and A method for personalizing regenerative braking of a vehicle, comprising the step of determining the deceleration rate corresponding to the average value of the peak value in the above brake pedal map as the deceleration rate preferred by the driver.
In claim 1, The above controller is equipped with a brake pedal map in which the braking deceleration rate is set according to the brake pedal input value, and The step of determining the deceleration rate preferred by the above-mentioned driver is, A step of determining peak values of the brake pedal input value indicated by the brake pedal sensor signal each time the driver operates the brake pedal; A step of determining the deceleration corresponding to each peak value of the above brake pedal input value from the above brake pedal map; and A method for personalizing regenerative braking of a vehicle, comprising the step of determining the average value of the above-determined deceleration as the deceleration preferred by the driver.
In claim 1, The above personalized regenerative braking map is a map in which the regenerative braking torque is set to a value according to the vehicle speed, and A method for personalizing regenerative braking of a vehicle, wherein the regenerative braking torque set in the above-described personalized regenerative braking map is a regenerative braking torque capable of controlling the vehicle deceleration rate during regenerative braking while coasting to the driver-preferred deceleration rate.
In claim 6, In addition to setting a plurality of selectable regenerative braking stages in the above controller, a pre-set regenerative braking map is provided for each of the said regenerative braking stages, and In the step where the above personalized regenerative braking map is generated, The above controller is, A method for personalizing regenerative braking of a vehicle, which generates a personalized regenerative braking map based on the map values of the pre-set regenerative braking maps provided for each regenerative braking stage and the driver's preferred deceleration rate.
In claim 7, The above-mentioned pre-configured regenerative braking map is, As a map in which regenerative braking torque is set to a value according to vehicle speed, A method for personalizing regenerative braking of a vehicle, wherein the regenerative braking torque is set in a map that can control the vehicle deceleration rate with a predetermined deceleration rate for each regenerative braking stage.
In claim 8, In the step where the above personalized regenerative braking map is generated, The above controller is, A method for personalizing regenerative braking of a vehicle, wherein, based on the deceleration rate determined for each regenerative braking stage, the driver's preferred deceleration rate, and the regenerative braking torque for each vehicle speed of the pre-set regenerative braking map, the regenerative braking torque, which is a map value of the personalized regenerative braking map, is determined by interpolation or extrapolation over the entire range of vehicle speeds to generate the personalized regenerative braking map.
In claim 8, The above personalized regenerative braking map has the regenerative braking torque in a vehicle speed range above a predetermined reference vehicle speed set to a certain value corresponding to the driver's preferred deceleration rate, and A method for personalizing regenerative braking of a vehicle, wherein the pre-set regenerative braking map provided for each regenerative braking stage is such that the regenerative braking torque in a vehicle speed range greater than or equal to the reference vehicle speed is set to a constant value corresponding to a deceleration rate determined for each regenerative braking stage.
In claim 1, A method for personalizing regenerative braking of a vehicle, further comprising the step of controlling the regenerative operation of a motor by the controller with a regenerative braking torque determined by the personalized regenerative braking map while the regenerative braking personalization mode is selected by the driver.
In claim 1, The method further includes a step in which the regenerative braking entry slope preferred by the driver is determined from the brake pedal sensor signal input by the above controller whenever the driver operates the brake pedal. The above controller is, When the driver turns off the accelerator pedal while the vehicle is in motion, A method for personalizing regenerative braking of a vehicle, which changes the regenerative braking torque from the point of acceleration pedal off to the regenerative braking entry slope until it reaches the regenerative braking torque, which is the map value of the personalized regenerative braking map.
In claim 12, The above controller is, A method for personalizing regenerative braking of a vehicle, wherein when the driver turns off the accelerator pedal while the vehicle is in a driving state where the vehicle speed is greater than or equal to the set vehicle speed, the regenerative braking torque is changed to the regenerative braking entry slope from the point of turning off the accelerator pedal.
In claim 12, The step in which the above-mentioned regenerative braking entry slope is determined is, A step of determining the deceleration slope from a brake pedal sensor signal input each time the driver operates the brake pedal during regenerative braking during coasting; A step of determining the average value of the deceleration slope at each determined brake pedal operation; and A method for personalizing regenerative braking of a vehicle, comprising the step of converting the average value of the deceleration slope into a regenerative braking torque slope and determining the converted regenerative braking torque slope as the regenerative braking entry slope.
In claim 14, In the step of determining the deceleration slope above, The above controller is, A method for personalizing regenerative braking of a vehicle that determines the deceleration slope by the value obtained by differentiating the above brake pedal sensor signal with respect to time.
In claim 12, In the step where the above regenerative braking entry slope is determined, The above controller is, A method for personalizing regenerative braking of a vehicle, which determines a regenerative braking entry slope preferred by the driver from the brake pedal sensor signal input during regenerative braking when the vehicle speed is greater than or equal to the set vehicle speed during coasting.

Description

Method for personalizing regenerative braking of vehicle The present invention relates to a method that enables personalized regenerative braking control based on different preferred deceleration rates and brake pedal sensitivities for each driver, thereby inducing more active use of regenerative braking by the driver. The biggest advantage that eco-friendly vehicles powered by motors, such as electric cars, hybrid cars, and fuel cell cars, have over internal combustion engine cars is that they can recover consumed energy through regenerative braking powered by the motor. Regenerative braking is a braking system that generates vehicle deceleration through the generation of power by a motor that converts the vehicle's kinetic energy (rotational energy transmitted through the drive wheels) into electrical energy, and during regenerative operation, the vehicle's deceleration can be controlled by adjusting the motor torque, that is, the regenerative braking torque. Recently, technology is being applied to both passenger and commercial vehicles that allows the degree of regenerative braking to be divided into multiple levels and set, enabling the driver to adjust and change the vehicle's regenerative braking level to their desired level by selecting one of the set multiple levels. For the application of this technology, a regenerative braking map such as that shown in Fig. 1 can be pre-entered and stored in the vehicle's controller and used. Fig. 1 shows an example in which the regenerative braking level can be selected and adjusted to one of level 0, level 1, or level 2. As illustrated in Fig. 1, the regenerative braking torque (wheel torque) is a negative (-) direction torque and is indicated by a negative (-) value. During regenerative braking, the greater the absolute value of the regenerative braking torque, the greater the vehicle deceleration. Furthermore, in the regenerative braking map, the higher the regenerative braking level, the larger the magnitude (absolute value) of the regenerative braking torque (wheel torque) is set to under the same vehicle speed conditions. Since a larger magnitude (absolute value) of the regenerative braking torque implies greater regenerative braking force and a higher amount of regenerative braking, a higher level offers the advantage of greater vehicle deceleration and higher battery charging as the amount of regenerative braking increases. Referring to the example in Fig. 1, when applying 0th, 1st, and 2nd gears at vehicle speeds of 20 to 100 km/h, constant deceleration rates of 0.02g, 0.1g, and 0.18g are set to occur, and in the vehicle speed range of 0 to 20 km/h, the regenerative braking torque and the amount of regenerative braking are set to gradually decrease as the vehicle speed decreases. In the regenerative braking map for each regenerative braking stage exemplified in Fig. 1, if the vehicle speed is 20 km/h as the reference vehicle speed, then in each regenerative braking map, the regenerative braking torque is set to a constant value that can control the vehicle deceleration rate at a predetermined constant deceleration rate for each regenerative braking stage within a vehicle speed range greater than or equal to the reference vehicle speed. In addition, in the regenerative braking map for each regenerative braking stage, the regenerative braking torque is set to a value according to the vehicle speed in the range from 0 km/h to the reference vehicle speed, and in this vehicle speed range, the regenerative braking torque is set to a gradually smaller value as the vehicle speed decreases and converges to 0. This is intended to facilitate the intervention of the existing mechanical braking system, which performs friction braking, for braking stability and reliability, as the vehicle speed approaches zero from below the reference vehicle speed. Additionally, it can be seen that the magnitude (absolute value) of the regenerative braking torque is set larger across the entire vehicle speed range as the gear number increases. Meanwhile, regenerative braking is activated the moment the foot is taken off the accelerator pedal. In addition, the regenerative braking torque is maintained even when the brake pedal is operated, and according to the example in Fig. 1, it gradually decreases at speeds of 20 km/h or less. In the aforementioned regenerative braking, conventionally, since it is impossible to change or adjust the regenerative braking stages and the deceleration rates for each stage set by the vehicle manufacturer after the vehicle is delivered, depending on the driver, if excessive regenerative braking is applied compared to the deceleration rate they desire, a situation may occur where the driver repeatedly presses and releases the accelerator pedal, which actually leads to a decrease in vehicle fuel efficiency. FIG. 2 is a diagram illustrating the problems of the prior art. As can be seen from the diagram, whenever a vehicle deceleration greater than the dece