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Method and system for controlling electric car parking braking

A technology of electric vehicles and power systems, applied in the direction of foot-operated starting devices, etc., can solve the problems of poor reliability of parking brakes, easy car slipping, and small parking brake force

Active Publication Date: 2017-02-08
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 electric car parking braking
  • Method and system for controlling electric car parking braking
  • Method and system for controlling electric car parking braking

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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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Abstract

The invention discloses a method and a system for controlling electric car parking braking, belonging to the electric car control field. The method comprises the following steps: a VCU (vehicle control unit) detects whether a brake pedal of an electric car is trampled down and whether the current gear of a gearshift is at a stopping gear; when the VCU detects that the brake pedal is trampled down, and the current gear of the gearshift is at the stopping gear, the VCU sends a control command to an MCU (memory control unit) via a CAN (controller area network) bus; the MCU receives the control command sent by the VCU, and controls the motor output presetting torque of the electric car according to the control command; the VCU sends a locking command to a PCM (pulse code modulation) via the CAN bus; and the PCM receives the locking command sent by the VCU, and controls the stopping gear locking mechanism of the electric car to lock an input shaft of a speed reducer according to the locking command to enable the wheels of the electric car to stop rotation. According to the method and the system for controlling electric car parking braking, the stability and the reliability of parking braking can be improved by controlling the stopping gear locking mechanism to lock the input shaft of the speed 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 Applications(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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