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Method and system for controlling parking brake of electric vehicle

A technology for electric vehicles and power systems, which is applied to foot start devices and other directions, can solve the problems that the rear wheels of electric vehicles cannot be completely locked, the reliability of parking brakes is poor, and the car is prone to slipping.

Active Publication Date: 2019-09-10
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the small parking braking force generated by the lever and the pull rope transmission itself, the rear wheels of the electric vehicle cannot be completely locked, especially when the electric vehicle is parked on a slope, it is prone to slipping, causing the parking brake to poor reliability

Method used

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  • Method and system for controlling parking brake of electric vehicle
  • Method and system for controlling parking brake of electric vehicle
  • Method and system for controlling parking brake of electric vehicle

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Embodiment Construction

[0051] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0052]The embodiment of the present invention provides a method for controlling the parking brake of an electric vehicle, the execution subject of the method may be: VCU (Vehicle Control Unit, vehicle controller), PCM (Powertrain Control Module, power system controller) and MCU (Moter Control Unit, motor controller). The VCU, the PCM, and the MCU perform command interaction through a CAN (Controller Area Network, control local area network) bus.

[0053] see figure 1 , the method includes:

[0054] Step 101: The VCU detects whether the brake pedal of the electric vehicle is stepped on and whether the current gear of the shift mechanism is in the stop gear.

[0055] Step 102: When the VCU detects that the brake pedal is stepped on an...

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PUM

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Abstract

The invention discloses a method and system for controlling the parking brake of an electric vehicle, belonging to the field of electric vehicle control. The method includes: the VCU detects whether the brake pedal of the electric vehicle is stepped on and whether the current gear of the shift mechanism is in the stop gear; the VCU detects that the brake pedal is stepped on and the current gear of the shift mechanism is in the stop gear , the VCU sends control commands to the MCU through the CAN bus; the MCU receives the control commands sent by the VCU, and controls the motor of the electric vehicle to output a preset torque according to the control commands; the VCU sends a locking command to the PCM through the CAN bus; the PCM receives the lock sent by the VCU According to the locking command, the stop gear locking mechanism of the electric vehicle is controlled to lock the input shaft of the reducer, so that the wheels of the electric vehicle stop rotating. The invention improves the stability and reliability of the parking brake by controlling the stop gear locking mechanism to lock the input shaft of the reducer.

Description

technical field [0001] The invention relates to the field of electric vehicle control, in particular to a method and system for controlling the parking brake of an electric vehicle. Background technique [0002] Due to the advantages of low operating cost, zero emission, and low noise, electric vehicles are favored by the majority of users. When the user drives an electric vehicle to travel, when parking at the destination or temporary parking, because the ground may be uneven, in order to prevent the electric vehicle from slipping, it is necessary to control the parking brake of the electric vehicle. [0003] At present, the parking brake is mainly realized through the parking brake lever, that is, when the user needs to park the electric vehicle, the user manually pulls up the parking brake lever, and the parking brake detects the parking brake When the joystick is pulled up, the parking brake force acting on the wheels of the electric vehicle is generated through the int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T7/04
Inventor 孔令静王春丽林新峰
Owner CHERY AUTOMOBILE CO LTD
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