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Pure electric vehicle torque function safety monitoring method and system, and vehicle

A functional safety, pure electric vehicle technology, applied in electric vehicles, power management, vehicle components, etc., can solve problems such as vehicle power interruption, and achieve the effect of avoiding power interruption, meeting safe driving requirements, and improving driving safety.

Active Publication Date: 2020-09-29
重庆长安新能源汽车科技有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

In the existing motor torque safety control strategy, by comparing the torque values ​​obtained by torque control and torque monitoring calculations, if the difference is within the preset safety threshold, it is judged that the motor torque control is in a safe state; otherwise, the torque control state is not When it is safe, the output signal of the torque monitoring module shuts down the IGBT power module circuit in an emergency, so that the motor controller enters the safe state mode, but this way of directly cutting off the power will bring unnecessary power to the vehicle when the torque fault of the motor system is not serious to interrupt

Method used

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  • Pure electric vehicle torque function safety monitoring method and system, and vehicle
  • Pure electric vehicle torque function safety monitoring method and system, and vehicle
  • Pure electric vehicle torque function safety monitoring method and system, and vehicle

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Embodiment Construction

[0047] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0048] see figure 1 As shown, this embodiment discloses a pure electric vehicle torque function safety monitoring method, including the following steps:

[0049] (S1) Obtain the vehicle demand torque, motor DC side parameters and motor AC side parameters; establish the AC side torque estimation model and obtain the AC side motor estimated torque according to the AC side torque estimation model, establish the DC side torque estimation model and Obtain the estimated torque of the DC side motor according to the DC side torque estimation model, establish a voltage torque estimation model and obtain the estimated torque of the motor according to the voltage torque estimation model; combine the estimated torque of the AC side motor, the estimated torque of the DC side motor and the motor After the estimated torque is filtered by the respective to...

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Abstract

The invention discloses a pure electric vehicle torque function safety monitoring method. The method is based on torque fault diagnosis, and vehicle driving safety is achieved and unnecessary power interruption is avoided by taking different countermeasures for faults causing different levels of motor torque safety. The invention further discloses a pure electric vehicle torque function safety monitoring system and a vehicle. Through the method and the system, driving safety of automatic driving (L3 level or above) of a pure electric vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of torque safety of electric vehicles, in particular to a method, system and vehicle for monitoring the torque function safety of pure electric vehicles. Background technique [0002] In recent years, with the continuous increase in the demand for intelligent vehicles, for L3 and above vehicles with automatic driving functions, preventing unexpected acceleration / deceleration of the power system is crucial to the safety of vehicle driving. As the key components of pure electric vehicles, the drive motor and motor controller are the only source of power for the vehicle, and the accuracy of its output torque directly affects the driving safety of the vehicle. The ISO26262 international standard specifically for road functional safety was officially promulgated and implemented in November 2011, which regulates the safety life cycle of automotive electronic and electrical functions. At present, the functional sa...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60L15/20
CPCB60L3/0061B60L15/20B60L2240/423Y02T10/72
Inventor 彭志远刘立陈曦陈健杜长虹周安健马永泉邓承浩
Owner 重庆长安新能源汽车科技有限公司
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