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Braking energy feeding control method of electric automobile

A braking energy feedback, electric vehicle technology, applied in electric vehicles, electric braking systems, brakes, etc., can solve problems such as difficulty in obtaining satisfactory results, locking, actively avoiding wheels, etc., and achieve high braking energy feedback efficiency, Avoid wheel lock, avoid the effect of complex operations

Inactive Publication Date: 2008-10-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Accurate road surface state identification results are required, and it is difficult to obtain satisfactory results in practical applications
[0009] 2. Passively stop energy feedback after ABS works, but cannot actively avoid wheel lock before ABS works

Method used

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  • Braking energy feeding control method of electric automobile
  • Braking energy feeding control method of electric automobile

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Embodiment Construction

[0043] Combine below figure 1 , 2 The invention is further described as follows.

[0044] Embodiment 1 of the brake energy feedback control method used in the front axle electric drive vehicle of the present invention is as follows: figure 1 shown, including the following steps:

[0045] 1) After receiving the pressure signal from the brake master cylinder (the pressure signal generated when the driver depresses the brake pedal), the brake starts;

[0046] 2) Collect signals such as brake master cylinder pressure, brake pedal stroke, motor torque, wheel speed and vehicle acceleration, and calculate the driver's required braking force F br , The actual braking force F of the vehicle ba , front axle wheel slip ratio S f (belonging to conventional technology in the art);

[0047] 3) Adjust the front axle hydraulic braking force F hf , Rear axle hydraulic braking force F hr with electric motor braking force Fm ; The specific adjustment is:

[0048] (1) If the ABS is worki...

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Abstract

The invention relates to a brake energy feedback control method of electric vehicle, wherein it adjusts the front axle hydraulic brake force Fhf, the back axle hydraulic brake force Fhr, and the motor brake force Fm, that receiving the pressure signal from the brake main cylinder; if ABS works, the motor brake force Fm=0, transferring the Fhf and Fhr to the ABS to be adjusted; if ABS not works, based on if the real brake force Fba meets the brake threshold value F, the sliding rate threshold value S, and the motor torque limit, adjusting, until the brake pedal is released, ending the brake. The invention can avoid dead clamped wheel without road recognition, to obtain high energy feedback efficiency.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle design, and in particular relates to a braking energy feedback control method for an electric vehicle with single-axis electric drive and electro-hydraulic composite braking. Background technique [0002] As a new type of vehicle developed under increasing environmental pressure, electric vehicles have become one of the research priorities in the automotive industry. Braking energy feedback is one of the means for electric vehicles to improve energy efficiency. The kinetic energy of the car when braking is converted into electricity by the electric motor and stored in the energy storage device, rather than being dissipated in the air through friction as in conventional vehicles. For single-axis electric drive vehicles, the existing braking energy feedback control method is as follows: [0003] 1. Identify the current road surface adhesion coefficient. [0004] 2. Calculate the maximum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/00B60L7/18
Inventor 罗禹贡周磊李克强连小珉杨殿阁郑四发王建强
Owner TSINGHUA UNIV
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