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Control method for downhill regenerative braking of series electric vehicle driven by hub motor

A technology of in-wheel motors and electric vehicles, which is applied in electric vehicles, electric braking systems, control drives, etc., can solve problems such as thermal degradation of braking performance, and achieve the effect of solving thermal degradation and protecting vehicles

Active Publication Date: 2018-12-18
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to provide a regenerative braking control method for a tandem electric vehicle driven by an in-wheel motor, which solves the problem of thermal degradation of braking performance caused by a sharp rise in brake temperature, thereby protecting the vehicle

Method used

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  • Control method for downhill regenerative braking of series electric vehicle driven by hub motor
  • Control method for downhill regenerative braking of series electric vehicle driven by hub motor
  • Control method for downhill regenerative braking of series electric vehicle driven by hub motor

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0033] The present invention provides a control method for regenerative braking of a serial electric vehicle driven by a hub motor, such as figure 1 As shown, it includes the following steps:

[0034] S1. Judgment of braking type: The vehicle controller collects the angle of the brake pedal in real time, converts the angle of the brake pedal into the pressure P of the brake master cylinder, calculates the braking torque T of the vehicle, and passes the braking torque T of the vehicle Determine whether the braking type is emergency braking or normal braking.

[0035] When the vehicle goes down a long slope, after the driver depresses the brake pedal, the vehicle controller analyzes the received voltage signal of the brake pedal angle sensor to obtain the angle of the brake pedal. The controller converts the brake master cylinder pressure P using rele...

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Abstract

The invention provides a Control method for downhill regenerative braking of series electric vehicle driven by hub motor, which converts an angle of a brake pedal into a brake master cylinder pressure, calculates a braking torque of the whole vehicle, and judges whether the braking type is emergency braking or conventional braking. The maximum regenerative braking torque of the hub motor is calculated when the generator works in the driving motor mode for conventional braking. Priority motor braking energy feedback is used in the braking torque distribution, and the generator is activated whenthe electric braking is limited to the maximum battery charging power. The braking torque distribution principle of hydraulic braking is used at last. When it is an emergency brake, the whole vehiclebrake is completely realized by mechanical brake. The invention eliminates the restriction of the maximum charging power of the power battery on the electric braking of the electric vehicle, and solves the problem that the braking efficiency is heat degenerated due to the sharp rise of the brake temperature.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to a control method for regenerative braking of a serial electric vehicle driven by a wheel hub motor on a long slope. Background technique [0002] The area of ​​mountainous areas in our country accounts for 69% of the total land area. Sometimes the continuous downhill slope is very long on the mountainous roads. Function, the speed of the vehicle is getting higher and higher. When the slope is very steep and long, the car is required to have sufficient continuous braking force to ensure that the main braking system of the car has sufficient braking performance when the car travels downhill to the end of the slope. But when the slope is long, due to continuous braking at high speed, the temperature of the brake may rise sharply due to the excessive use of the service brake to control the speed of the vehicle, resulting in a thermal decline of the braking eff...

Claims

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Application Information

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IPC IPC(8): B60L7/10B60L15/20B60T17/22
CPCB60T17/22B60L7/10B60L15/2018B60L2240/423Y02T10/72
Inventor 付翔卢洋吴森
Owner WUHAN UNIV OF TECH
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