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Control method of vehicle magnetorheological fluid braking system based on braking intention identification

A braking system and magnetorheological fluid technology, applied in electric braking systems, electric vehicles, brake types, etc., can solve the problem of no magnetorheological fluid braking system control method, etc.

Active Publication Date: 2019-01-29
HEFEI UNIV OF TECH
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Problems solved by technology

There is no control method based on magneto-rheological fluid braking system

Method used

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  • Control method of vehicle magnetorheological fluid braking system based on braking intention identification
  • Control method of vehicle magnetorheological fluid braking system based on braking intention identification
  • Control method of vehicle magnetorheological fluid braking system based on braking intention identification

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Embodiment Construction

[0087] Such as figure 1 As shown, the system includes three parts: data acquisition unit, braking intention recognition unit, and control output unit. Among them, the data acquisition unit mainly includes a photoelectric encoder, a torque sensor and a vehicle speed sensor. The photoelectric encoder is installed on the brake pedal. Above, the pedal displacement and pedal speed of the brake pedal can be obtained by collecting the pulse number and pulse frequency; the torque sensor is installed in the magneto-rheological fluid braking system to collect the braking torque generated by the magneto-rheological fluid braking system ; The vehicle speed sensor is installed on the tire of the vehicle and is used to collect the driving speed of the vehicle. The braking intention recognition unit identifies the braking intention of the car according to the pedal displacement, pedal speed and vehicle speed collected by the data collection unit. The control output unit outputs the target b...

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Abstract

The invention relates to a control method of a vehicle magnetorheological fluid braking system based on braking intention identification. The control method of the vehicle magnetorheological fluid braking system based on braking intention identification comprises the following steps that vehicle speed is collected through a vehicle speed sensor; whether vehicle speed at this time is at slow speedor not is judged, if the vehicle speed is at a slow speed state, the braking intention is identified as basic braking; otherwise, values of pedal displacement and pedal speed are taken as input values, and the corresponding braking intention is identified by a fuzzy controller; a target braking torque is obtained according to a target braking torque generation algorithm in a control output unit; and through integral separation PID control, actual braking torque can be output accurately, stably and quickly. The control method of the vehicle magnetorheological fluid braking system based on braking intention identification can accurately, stably and quickly output braking torque while rapidly identifying the braking intention of a driver, braking time can be reduced, efficient braking effectcan be achieved, and loss of life and property is avoided.

Description

technical field [0001] The invention relates to the technical field of automobile braking control methods, in particular to a method for controlling a magneto-rheological fluid braking system for vehicles based on braking intention identification. Background technique [0002] The magneto-rheological fluid brake system for vehicles is a new type of automotive brake-by-wire system. The corresponding braking torque is generated by controlling the excitation current of the excitation coil in the magneto-rheological fluid brake. Therefore, it is necessary to design its control algorithm to achieve fast, Stable braking effect. In the existing braking system, the effective braking of the car is mainly achieved through the relationship between the pedal displacement and the braking torque, and the braking effect only depends on the displacement of the driver's pedal. However, the driver may cause untimely braking or failure due to various reasons such as slow reaction and nervousn...

Claims

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Application Information

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IPC IPC(8): B60L7/00F16D57/00
CPCB60L7/00F16D57/002
Inventor 王道明王彪訾斌王正雨钱森陈兵方时瑞董涛
Owner HEFEI UNIV OF TECH
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