Electric vehicle braking energy recovery control algorithm

A technology of braking energy recovery and control algorithm, applied in electric vehicles, electric braking systems, vehicle components, etc., can solve problems such as lack of solutions and control algorithms

Active Publication Date: 2021-04-09
刘清河
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, braking energy recovery technology, as one of the core competitiveness of electric vehicles, has not yet obtained an ideal solution and control algorithm

Method used

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  • Electric vehicle braking energy recovery control algorithm
  • Electric vehicle braking energy recovery control algorithm

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Embodiment Construction

[0026] implementation plan( figure 1 ) takes the rear-wheel-drive electric vehicle as an example, and is also applicable to the front-wheel-drive electric vehicle.

[0027] Such as figure 1 In the electric car with rear wheel drive shown, both the front and rear wheels can apply frictional braking force through the electronic brake controller (EBS). In addition, the rear wheels can also apply motor regenerative braking force through the motor controller (MC). Composite braking controller (RBS) is responsible for running the control algorithm designed by the present invention, and sends the frictional braking force demand F of the front wheels follow and the friction braking force demand F of the rear wheels driv , regenerative braking force demand F reg To EBS and MC, finally EBS and MC complete the application of each braking force and feed back the braking force actually obtained on the wheel measured by the sensor to RBS.

[0028] The control algorithm flow of the brak...

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Abstract

The invention relates to a braking energy recovery control algorithm for an electric vehicle, which is characterized in that it consists of the following steps: at the initial stage of braking, only the regenerative braking force of the motor is used for braking, and as much braking energy as possible is recovered; The road surface adhesion coefficient and vehicle mass estimation algorithm of the square method obtains the road surface adhesion coefficient information of the vehicle braking and the vehicle load status information; in the middle of the braking process, the Kalman filter algorithm is used to estimate the slip ratio of the front and rear wheels; in order to improve To estimate the accuracy of slip ratio, the vehicle mass and road adhesion coefficient obtained at the initial stage of braking are brought into the Kalman filter algorithm as initial values; at the end of the braking process, when the vehicle speed drops below V0, in order to improve braking To improve the driving comfort, prevent the torque fluctuation caused by the low motor speed, adopt the algorithm of smoothly reducing the regenerative braking force while increasing the friction braking, gradually transition to the pure friction braking mode, and finally realize the parking of the vehicle.

Description

Technical field: [0001] The invention relates to the technical field of new energy vehicles, in particular to a braking energy recovery technology for pure electric vehicles driven by a single shaft and a braking energy recovery control algorithm for electric vehicles with a composite braking system. Background technique: [0002] Due to its environmental friendliness and simple structure, pure electric vehicles have been identified as the best supported development direction of automobile technology in China. With the subsidy support of governments at all levels in the country, the technology of electric vehicles has achieved considerable development and progress in recent years. New breakthroughs have been made in the core technologies of motor, battery and electronic control, and more and more companies have been able to independently complete the design, development and production of pure electric vehicles. However, braking energy recovery technology, as one of the core...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L7/18B60L7/26
CPCB60L7/18B60L7/26
Inventor 刘清河
Owner 刘清河
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