A method for distributing braking force of an electric vehicle
A braking force distribution, electric vehicle technology, applied in the direction of brakes, etc., can solve the problems of increasing control complexity, reducing the safety of electric vehicles, and prone to locking of wheels.
Active Publication Date: 2022-02-01
HARBIN UNIV OF SCI & TECH
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, when electric vehicles brake on roads with low adhesion coefficient (water, ice and snow), since most of the braking force is provided by regenerative braking force, the wheels are prone to lock-up, and the traditional anti-lock braking system of electric vehicles will reduce mechanical braking. Power, at this time, control the motor to reduce energy recovery, which increases the complexity of control and reduces the safety of electric vehicles
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0049] Energy regenerative braking on electric vehicles brings two basic problems to the design of its braking system: one is how to distribute the required braking force between regenerative braking and friction braking, and to regenerate braking as much as possible energy; the second is how to distribute the total braking force on the front and rear axles to achieve stable braking performance. Usually regenerative braking is only effective for the drive shaft. In order to recover as much braking energy as possible, the motor must be controlled to generate a specific amount of braking force. In order to meet the vehicle deceleration command from the driver, there must be sufficient total braking force at the same time.
[0050] Taking the ADVISOR2002 pure electric vehicle model as an example, the regenerative braking of electric vehicles is affected by many factors such as motor power, energy storage state of charge SOC, maximum bus current, and braking intensity. Therefore,...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A braking force distribution method for an electric vehicle, which belongs to the field of electric vehicles; this application aims to solve the problem of controlling the motor to reduce energy recovery when braking an electric vehicle on a road surface with a low adhesion coefficient, increasing the complexity of control, and reducing the safety of the electric vehicle Problem; this application includes the following steps: distribute the front and rear wheel braking force according to the braking intensity; take the braking intensity, battery SOC and total required braking force as input, and output the ratio of the regenerative braking force to the front wheel braking force through the fuzzy controller ; Use the front wheel braking force to subtract the regenerative braking force to obtain the frictional braking force to be borne by the front wheels; set the specified slip rate, take the actual slip rate as input, and obtain the ratio of reducing the regenerative braking force through backstepping control, when the actual When the slip rate exceeds the specified slip rate, the backstepping control reduces the distribution of the braking share of the drive motor; this application can provide as much energy recovery as possible while maintaining the safety of electric vehicles on roads with low adhesion coefficients.
Description
technical field [0001] A method for distributing braking force of an automobile belongs to the field of electric vehicles, and in particular relates to a method for distributing braking force of an electric vehicle. Background technique [0002] Because existing automobiles use mechanical friction for mechanical braking, electric vehicles can use inertial drive to make the motor work in the power generation state. In this state, the braking torque provided by the motor can reduce part of the mechanical braking. Although the braking torque provided by the motor is not mechanical braking, it can also form the friction between the wheel tire and the ground and provide the effect of deceleration braking force to the electric vehicle. At present, the energy recovery control strategy mainly adopts a fuzzy controller, which takes the battery state of charge SOC, total demand braking force and braking intensity as input, and the output is the ratio of regenerative braking. The dist...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/17B60T8/172B60T8/174B60T8/1763
Inventor 于德亮刘冬赵鹏舒王文嵩
Owner HARBIN UNIV OF SCI & TECH