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Overspeed protection method and device

A technology of overspeed protection and current speed, applied in control devices, transportation and packaging, electric vehicles, etc., which can solve problems such as vehicle loss of power, capacitor burnout, and inability to charge energy recovery current.

Active Publication Date: 2018-11-02
BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the battery system has high power or fails to allow energy recovery, if the vehicle controller sends a braking torque to the motor system, the generated energy recovery current will not be charged into the battery, but will be fully injected into the motor control system. In the DC bus capacitor of the inverter, the capacitor is burned, which makes the vehicle lose power at high speed, posing a safety hazard

Method used

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  • Overspeed protection method and device
  • Overspeed protection method and device
  • Overspeed protection method and device

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Embodiment Construction

[0036] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0037] In the first aspect, the embodiments of the present disclosure provide an overspeed protection method, which is mainly applied to the vehicle controller side, such as figure 1 As shown, the method includes:

[0038] 101. When the current rotational speed of the drive motor is greater than the overspeed fault protection threshold, determine whether the current state meets the condition for charging the battery system.

[003...

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Abstract

The embodiment of the invention discloses an overspeed protection method and an overspeed protection device, relates to the technical field of automobile, and can solve the problem that the existing overspeed protection strategy is liable to damage the motor system. The method mainly comprises the following steps of: when the current rotating speed of the driving motor is larger than the overspeedfault protection threshold value, judging whether the current state meets the condition for charging the battery system; if not, the vehicle is decelerated by sending a braking torque to the brake system. The overspeed protection method is mainly applicable to the scene of vehicle overspeed protection.

Description

technical field [0001] The embodiments of the present disclosure relate to the technical field of automobiles, in particular to an overspeed protection method and device. Background technique [0002] With the progress of society, cars have almost become a necessary means of transportation for every household. People's lives are becoming more and more convenient. However, with more and more cars on the road, traffic safety is getting more and more attention. In order to improve driving safety, automobile developers have added an anti-speeding function to automobiles when developing automobiles. Specifically, when the current speed of the driving motor is greater than the overspeed fault protection threshold, the vehicle will execute the overspeed protection strategy, that is, the vehicle controller sends braking torque to the motor system to decelerate the vehicle, and after sending the braking torque, a The energy recovery current charges the battery and increases the cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20
CPCB60L15/2009B60L2240/421Y02T10/72
Inventor 马东辉韩亚南
Owner BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD