Braking energy feeding control method of electric automobile

A technology of braking energy feedback and electric vehicles, which is applied in the direction of electric vehicles, electric braking systems, vehicle components, etc., can solve problems such as difficult to obtain satisfactory results, lock, actively avoid wheels, etc., and achieve high braking energy feedback efficiency , to avoid wheel locking, to avoid the effect of complex calculations

Inactive Publication Date: 2007-05-16
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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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] The present invention is further described as follows in conjunction with FIGS. 1 and 2 .

[0044] Embodiment 1 of the brake energy feedback control method for a front-axle electric drive vehicle according to the present invention is shown in Figure 1, and includes 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 F m ; The specific adjustment is:

[0048] (1) If the...

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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, in particular 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 braking forc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/18
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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