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Tandem type regenerating braking system for electric automobile and control method thereof

Active Publication Date: 2015-07-29
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The braking force of the system cannot be judged comprehensively, and electric braking and mechanical braking (such as air braking) act on electric vehicles respectively;
[0004] (2) When there is a problem (such as damage) in one braking mode, the other mode cannot make up for the lost braking force, resulting in changes in driving habits and likely to cause safety accidents
The disadvantage is that the method of judging the system braking force of this scheme is still limited, and it is impossible to make a correct corresponding strategy according to the actual situation

Method used

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  • Tandem type regenerating braking system for electric automobile and control method thereof
  • Tandem type regenerating braking system for electric automobile and control method thereof
  • Tandem type regenerating braking system for electric automobile and control method thereof

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Embodiment 1

[0039] Embodiment 1: A series electric vehicle regenerative braking system, its circuit principle connection diagram is as follows figure 1 As shown, including vehicle controller 9, accelerator pedal sensor 1, brake pedal sensor 2, vehicle speed sensor 3, battery management system 4, braking system 6 and motor controller 8, accelerator pedal sensor, brake pedal sensor and The vehicle speed controller is connected to the vehicle controller through a hard line, and the battery management system, braking system and motor controller are connected to the vehicle controller through the CAN bus. The battery management system is used to manage the power battery 5, and the motor controller is used to control the motor 7. The brake system includes a mechanical brake structure and an electric brake structure, and the mechanical brake structure and the electric brake structure are connected in series.

[0040] The control method of the regenerative braking system of the tandem electric v...

Embodiment 2

[0048] Embodiment 2, a series regenerative braking system for electric vehicles, its structure is the same as that of Embodiment 1, and the control method is different from Embodiment 1 in that step 3 also includes when the brake pedal sensor does not detect that the driver has stepped on brake pedal, skip to step 4;

[0049] Step 4, the vehicle controller implements a sliding feedback control strategy, and the specific details of the sliding feedback control strategy are as follows: Figure 4 As shown, including 4 sub-steps:

[0050] In sub-step 4, the vehicle controller calculates the maximum feedback torque according to the vehicle speed obtained by the vehicle speed sensor signal, and then performs weighted correction on the maximum feedback torque, and synthesizes the available power state of the battery under the current state to obtain the coasting feedback torque;

[0051] In sub-step 5, the vehicle controller sends the sliding feedback torque command to the motor con...

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Abstract

The invention discloses a tandem type regenerating braking system for electric automobile and control method thereof. A vehicle control unit carries out a braking feedback control strategy to obtain a vehicle speed according to a vehicle speed sensor signal and calculate the maximum feedback torque; the vehicle control unit calculates a pedal depth according to a brake pedal sensor, and obtains the maximum useable feedback torque by referring to useable power state of a battery under the current state; the vehicle control unit sends the maximum useable feedback torque order to a motor controller, and the motor controller executes the order and sends an actual feedback torque order to the vehicle controller; the vehicle control unit sends the actual feedback torque to a brake system; the brake system distributes the brake force according to the actual feedback torque. The tandem type regenerating braking system for electric automobile and the control method thereof can reasonably distribute a point braking force and a mechanical braking force according to the actual vehicle condition of an electric automobile; moreover, the power storage battery is protected to the greatest degree.

Description

technical field [0001] The invention relates to a regeneration system of an electric vehicle, in particular to a serial electric vehicle regenerative braking system and a control method thereof which scientifically and reasonably allocate mechanical braking and electric braking during the deceleration process of the electric vehicle. Background technique [0002] With the application of new energy and new technologies in daily life, people pay more and more attention to electric vehicles. Due to the limitation of the energy density of power batteries, the cruising range of electric vehicles is less than that of traditional vehicles, and the motor itself has dual functions of driving and power generation. Features, using the motor as a generator, the kinetic energy wasted during the braking process of the vehicle is converted into electrical energy and stored in the power system without adding additional devices, which can effectively improve energy utilization, increase cruis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/18B60L7/26
Inventor 刘敢闯李超平洪亮
Owner WANXIANG 123 CO LTD