Regenerative braking system and braking method for wheel hub motor-driven automobile

An in-wheel motor and regenerative braking technology, applied in the direction of brake transmission, brakes, vehicle components, etc., can solve the problem of lack of regenerative braking technology in four-wheel drive pure electric vehicles, and achieve the effect of improving braking efficiency

Active Publication Date: 2018-07-10
JILIN UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing regenerative braking technologies are for hybrid electric vehicles or two-wheel drive pure electric vehicles, and there are few regenerative braking technologies for four-wheel drive pure electric vehicles driven by in-wheel motors

Method used

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  • Regenerative braking system and braking method for wheel hub motor-driven automobile
  • Regenerative braking system and braking method for wheel hub motor-driven automobile
  • Regenerative braking system and braking method for wheel hub motor-driven automobile

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Embodiment Construction

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0051] Such as figure 1 , 2As shown, the present invention provides a regenerative braking system for an in-wheel motor driven vehicle, which includes an in-wheel motor regenerative subsystem and a hydraulic braking subsystem. The hydraulic braking subsystem includes: a brake master cylinder 110; and a first energy storage The device 120 is connected to the brake master cylinder 110 and is provided with an on-off valve 121. Its functions are mainly reflected in two aspects. One is to store the high pressure from the brake master cylinder 110 under pure motor braking conditions. The brake fluid follows the driver's braking operation, and the second is to quickly build up the hydraulic braking force without affecting the hydraulic braking force when the braking capacity of the...

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Abstract

The invention discloses a regenerative braking system for a wheel hub motor-driven automobile. A motor braking and hydraulic braking composite mode can be realized to enhance the braking efficiency. The invention further provides a regenerative braking method for the wheel hub motor-driven automobile. The regenerative braking method for the wheel hub motor-driven automobile comprises the followingsteps of step 1, obtaining total braking torque needed by braking according to pedal displacement, distributing the total braking torque to a front axle and a rear axle according to a fixed proportion and uniformly distributing braking forces of the front axle and the rear axle to corresponding wheels, wherein the motor braking force and hydraulic braking force of each wheel are independently controlled; step 2, obtaining the rotation speed of a wheel hub motor according to the current wheel rotation speeds and calculating maximum braking torque Tm, which can be provided by the wheel hub motor; and step 3, when the desired braking forces Trep of the wheels are less than 0.8 Tm, executing a pure motor braking mode; when the desired braking forces Trep of the wheels are not less than 0.8 Tm, executing a composite braking mode of the wheel hub motor braking and hydraulic braking; and after the automobile speed is decelerated to 10 km/h, entering a pure hydraulic braking mode, closing a wheel hub motor regenerative sub system and opening a pressure increasing valve to enhance the braking efficiency.

Description

technical field [0001] The invention relates to the field of braking systems of electric vehicles, and more specifically, the invention relates to a regenerative braking system and a control method for a hub motor driven vehicle. Background technique [0002] In recent years, with the increase in car ownership, my country has become the largest car consumer market. While cars are convenient, they also bring troubles such as energy, environment, and safety. According to statistics, now 50% of urban air pollution comes from automobiles. At the same time, the further improvement of indicators such as emission standards and energy efficiency will also promote the development of automobiles in the direction of energy saving, safety and environmental protection. Therefore, new products such as new energy vehicles appear in people's field of vision. In the family of electric vehicles, in-wheel motor-driven vehicles have many advantages such as fast torque control response and hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/16B60T8/58B60T13/14
CPCB60T8/58B60T13/142B60L7/16Y02T10/72
Inventor 靳立强张广明雷北海张卉田端洋王天怡刘礼用赵恒喜
Owner JILIN UNIV
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