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Series braking system of electric automobile and control method thereof

A technology for electric vehicles and braking systems, applied in electric braking systems, electric vehicles, vehicle components, etc., can solve problems such as unfavorable engineering implementation, increased costs, and failure to meet the driver's driving comfort requirements, so as to achieve the reduction effect The effect of increasing time, increasing lifespan, and improving energy feedback efficiency

Pending Publication Date: 2020-06-30
SICHUAN YEMA AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the scheme is simple to control, the driver's operating comfort is poor, and the energy feedback efficiency is low
[0004] The invention patent with the application number CN201410226728.6 provides a series braking control system based on pure electric four-wheel drive. This patent balances the contradiction between vehicle stability and braking performance, but the algorithm is too complicated to Conducive to project realization
The invention patent with the application number CN201510025850.1 provides a segmented series braking system, which divides the driver's braking intention into mild, moderate and

Method used

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  • Series braking system of electric automobile and control method thereof
  • Series braking system of electric automobile and control method thereof
  • Series braking system of electric automobile and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0053] Example one

[0054] A certain type of electric vehicle is driving at a speed of 60km / h, which is greater than the set speed threshold of 10km / h; the driver releases the accelerator pedal and does not step on the brake pedal, the series composite brake control unit sends the expected negative torque -10Nm( Corresponding to the vehicle deceleration 0.03g) to the vehicle controller VCU, the VCU forwards the instruction to the motor controller MCU for execution.

[0055] At this time, the driver steps on the brake pedal, and the pedal stroke change rate is greater than the set threshold 0.2 / S (total pedal depth is 1), and the depth is 60%, the corresponding total torque demand is -88Nm, and the series compound brake The control unit allocates all -88Nm to the mechanical brake. The calibration curve of pedal stroke and braking torque is as image 3 Shown.

Example Embodiment

[0056] Example two

[0057] A certain type of electric vehicle travels at a speed of 60km / h, which is greater than the set speed threshold of 10km / h; the driver steps on the brake pedal, and the pedal stroke change rate is less than the set threshold 0.2 / S:

[0058] If the brake pedal depression depth is 40%, the series compound brake control unit will allocate the total braking torque demand of -28Nm to the electric brake; when the vehicle speed decelerates to 50km / h, the driver continues to depress the brake pedal deeply until 50%, the series compound brake control unit allocates -30Nm of the total braking torque demand -64Nm to electric braking, and the remaining -34Nm to mechanical braking; when the vehicle speed decelerates to 40km / h, the driver continues to deepen Step on the brake pedal to 70%, and the series compound brake control unit will allocate the total braking torque demand -170Nm to the mechanical brake.

Example Embodiment

[0059] Example three

[0060] A certain type of electric vehicle is traveling at a speed of 60km / h. If the brake pedal is depressed at a depth of 40%, the series composite brake control unit will allocate the total braking torque demand of -28Nm to the electric brake; at this time, the MCU reports malfunction,

[0061] Then the series compound brake control unit immediately exits the electric brake, and all the total brake torque is allocated to the mechanical brake.

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Abstract

The invention discloses a series brake system of an electric automobile and a control method thereof. According to the method based on the system, when the system is used, if the current automobile speed is greater than a set automobile speed, a driver releases an accelerator pedal and does not operate a brake pedal, and a constant negative torque is distributed to electric brake; if the driver operates the brake pedal, the pedal stroke change rate is larger than or equal to a set threshold or the current vehicle speed is smaller than or equal to a set vehicle speed, the total brake torque requirement is completely distributed to a mechanical brake system; when the driver operates the brake pedal, the vehicle speed is larger than the set vehicle speed, and the pedal stroke change rate is smaller than the set threshold: the depth of the brake pedal is smaller than or equal to a1, the total brake torque demand is completely distributed to electric brake, wherein the depth of the brake pedal is larger than a1 and smaller than or equal to a2, the maximum allowable braking torque of electric brake is distributed to electric brake, and the remaining required torque is distributed to a mechanical braking system; and if the depth of the brake pedal is larger than a2, the total brake torque requirement is completely distributed to the mechanical brake system.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a series braking system and a control method of an electric vehicle. Background technique [0002] Under the double pressure of energy and environment, the development of low-carbon and environment-friendly automobiles has attracted more and more attention from the society. As a clean new energy vehicle, electric vehicles have been rapidly promoted in our country. However, electric vehicles are limited by power batteries, and the contradiction between their cost and mileage will remain one of the bottlenecks restricting the promotion of electric vehicles for a period of time. Therefore, strengthening battery energy recovery and minimizing mechanical braking at this stage is one of the effective means to increase the cruising range of the vehicle. [0003] At the present stage, the energy recovery of electric vehicles often adopts the combination of coastin...

Claims

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Application Information

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IPC IPC(8): B60L7/26
CPCB60L7/26Y02T10/72
Inventor 杨辉
Owner SICHUAN YEMA AUTOMATION CO LTD