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A method and system for comprehensive regulation and control of electric vehicle braking torque

A braking torque, electric vehicle technology, applied in the direction of brakes, etc., can solve the problem of not considering the problem of braking torque distribution, and achieve the effect of improving braking control performance

Active Publication Date: 2019-07-05
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"An Electro-hydraulic Hybrid Braking Control Method and Its Control Device for Electric Vehicles" (Patent No. 201310228662.X) selects a braking mode according to the driver's intention, and uses motor braking to recover energy on the basis of ensuring braking safety energy, without considering the distribution of braking torque

Method used

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  • A method and system for comprehensive regulation and control of electric vehicle braking torque
  • A method and system for comprehensive regulation and control of electric vehicle braking torque
  • A method and system for comprehensive regulation and control of electric vehicle braking torque

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Embodiment Construction

[0058] A method for comprehensive regulation and control of hybrid braking torque of an electric vehicle, using such as figure 1 The integrated control system for electric vehicles shown includes a brake monitor, an upper front / rear wheel braking torque adaptive controller and a lower motor / mechanical braking torque distributor. When the driver depresses the pedal to brake, the braking torque is linearly output according to the pedal stroke. At the same time, the brake monitor calculates the tire slip rate based on the vehicle speed and wheel speed. If a sudden change in the slip ratio is detected, the slip ratio regulator is turned on to comprehensively regulate the braking torque, which mainly includes tire-road friction torque estimation, wheel braking torque adaptive control, and braking torque distribution.

[0059] The specific control links are as follows:

[0060] S1. Tire-Road Friction Estimation

[0061] In order to approximate the nonlinear relationship between t...

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Abstract

The invention relates to a comprehensive regulating method and system for electric vehicle braking torque. As the pedal stroke continuously increases and a sudden change in the wheel slip ratio is monitored, the braking torque is comprehensively regulated. The method comprises: tire-pavement friction force estimation, braking torque adaptive control and braking torque distribution. Current wheel slip ratios and a slip ratio difference are calculated in real time through the vehicle speed, wheel speeds and the like, by combining the tire model fitting function, the front and rear wheel slip ratio error threshold and the observer regulating gain which are preset, the variable directly relevant to the front and rear tire-pavement friction force is estimated at the same time, braking torque currently required for front and rear wheels correspondingly is further calculated, and the front and rear wheel slip ratios are maintained around ideal value. The front and rear wheel braking torque is approximately distributed to the front and rear wheel motor braking torque and mechanical braking torque according to the braking torque distribution coefficient-frequency curve. By applying the method, the braking control performance of the electric vehicle system is effectively improved.

Description

technical field [0001] The invention relates to braking control of electric vehicles, in particular to a method and system for comprehensive regulation and control of braking torque of electric vehicles. Background technique [0002] Braking performance is one of the most important factors in a vehicle's active safety system. At present, cars are equipped with anti-lock brake system (Antilock Brake System, ABS), so that the vehicle can maintain the best wheel slip rate during emergency braking, so as to optimize the tire longitudinal adhesion and shorten the braking distance. At the same time, the lateral adhesion of the wheels can also be optimized through brake control, so as to maintain good vehicle handling performance. The improvement of the performance of the braking system will further guarantee the safety of the vehicle and the occupants. At the moment of emergency braking, the impact of the difference in braking performance will be more prominent. Therefore, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/171B60T8/172
CPCB60T8/171B60T8/172
Inventor 李维剧季祝小元陈淑荣
Owner SHANGHAI MARITIME UNIVERSITY
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