Fail protection method and system for electric vehicle electric control device

A failure protection, electronic control device technology, applied in electric vehicles, electrical devices, control devices, etc., can solve problems such as incomplete prevention, traffic accidents, and inability to realize CAN communication, and achieve the effect of reducing harm and preventing system damage.

Active Publication Date: 2016-07-27
NEW UNITED GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The VCU adopts dual controllers (master controller + slave controller), only considering the failure of the master controller. When the VCU power supply fails or the overall damage occurs, the slave controller may not be able to take over The work of the main controller
[0006] (2) The redundant CAN bus is adopted, only from the perspective of CAN communication, when the overall wiring harness is disconnected, the plug is loose, etc., the CAN communication may not be realized
[0007] Moreover, if the protection measures of the electronic control device are not adopted, if the ele

Method used

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  • Fail protection method and system for electric vehicle electric control device
  • Fail protection method and system for electric vehicle electric control device
  • Fail protection method and system for electric vehicle electric control device

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Embodiment 1

[0031] like figure 1 As shown, a failure protection method for an electronic control device of the present invention includes: a vehicle control unit (abbreviated as VCU in the embodiment), a battery management unit (abbreviated as BMS in the embodiment) and The motor control units (abbreviated as MCU in the embodiment) are interconnected through the CAN bus, and after judging that any one unit or all three units are offline, a corresponding failure protection mechanism is activated.

[0032] The offline state mentioned in the present invention specifically refers to failures of VCU, BMS and MCU, including but not limited to program crashes, hardware damage, short circuits, and disconnection of communication lines, which cause the corresponding units to leave the CAN bus, and then the corresponding units fail. The offline state can also become a failure state; if all three units are separated from the CAN bus, it is determined that the CAN bus is invalid.

[0033] The vehicle...

Embodiment 2

[0101] Embodiment 2 provides an electronic control device, the electronic control device adopts a topology structure, that is, the vehicle control unit, the battery management unit and the motor control unit are interconnected through the CAN bus to achieve mutual coordination; and in any unit or three After all the units are offline, the corresponding failure protection mechanism is started.

[0102] A brake system is connected to a vehicle control unit (VCU) and a motor controller (MCU) through a brake signal line.

[0103] The vehicle control unit, battery management unit and motor control unit determine whether each unit is online through the heartbeat mechanism; and the vehicle control unit, battery management unit and motor control unit set independent delay processing time T VCU , T BMS , T MCU , and T VCU >T BMS >T MCU .

[0104] Each protection mechanism is as follows, and for the specific implementation manner of each protection mechanism, refer to the correspo...

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Abstract

The invention relates to a fail protection method and system for an electric vehicle electric control device. The fail protection method is characterized in that a vehicle control unit, a battery management unit and a motor control unit in the electric control device are connected through a CAN bus, and corresponding fail protection mechanisms are started after it is determined that any one unit or the three units are in the off-line state. According to the fail protection method and system for the electric control device, after the vehicle control unit or the battery management unit or the motor control unit and the bus fail, the effective units can independently or systematically work according to the preset fail protection mechanisms, the electric control device body can be effectively protected, and system damage caused by a high-voltage discharging time sequence can be avoided as much as possible; after the system fails, the vehicle can be slowed down according to a preset strategy, and harm especially generated easily on the condition of high-speed driving or overtaking or the like and on the condition that power is lost suddenly and the electric control device is not controlled is reduced.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a failure protection method and system for electric vehicle electronic control devices. Background technique [0002] Electric vehicle electronic control devices mainly include vehicle control unit (Vehicle Control Unit, VCU), battery management system (Battery Management System, BMS), motor control unit (Motor Control Unit, MCU), and the three communicate through CAN bus to realize electronic control management (this way is the mainstream practice of pure electric vehicles in China). When the car is running, if the electronic control device VCU, BMS, MCU or CAN bus fails, some functions of the car will be out of control, which may bring danger to personal safety; at the same time, if the predetermined high-voltage power-off sequence is not followed, the Automobile parts can cause damage. [0003] Examples of existing technical solutions: (1) The VCU adopts dual controllers (ma...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60L15/20
CPCB60L3/0084B60L3/0092B60L15/20B60L15/2009B60L15/2063B60L2240/423Y02T10/72
Inventor 仲启端管和平张玉江刘礼亚姚宁
Owner NEW UNITED GROUP
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