Fault detection and control method and device for electric vehicle vacuum brake
A technology of fault detection and vacuum braking, which is applied in the direction of braking safety systems, etc., can solve the problems of lagging detection results, inability to intervene in vehicle driving status, and affecting vehicle reliability, so as to increase safety and improve fault detection efficiency.
Active Publication Date: 2021-04-16
GUANGZHOU AUTOMOBILE GROUP CO LTD
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Problems solved by technology
[0004] However, the current failure detection of vacuum pumps has shortcomings such as inaccurate detection, easy false alarms, low detection efficiency, and lagging detection results. After detecting a failure of the vacuum pump, it only reminds the fault, but cannot monitor the driving status of the vehicle. Intervention, especially in dangerous working conditions, which greatly affects the reliability of vehicle braking and also affects the safety of vehicles
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[0028]In order to make the objects, technical solutions, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
[0029]Such asfigure 1 As shown, in the embodiment of the present invention, a fault detection and control method of a vacuum braking provided by an electric vehicle, including the following steps:
[0030]Step S1, under the driving operation of the brake switch signal, when it is determined that the working time of the vacuum pump is less than the first duration, and the number of the working interval of the vacuum pump is less than the number of preset time thresholds exceeds the preset total number When it is determined that the working time of the vacuum pump is greater than or equal to the preset first duration and less than the preset second duration, the control combination meter is controlled by fault alarm;
[0031]Step S2, under either line of driving conditions, when it is det...
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The invention provides a method of failure to detect and control the vacuum brake of electric vehicles, including the operating conditions of the brake switch signal that the brake switch signal is not triggered, and the working time of the vacuum pump is less than the first duration of the preset, and the vacuum pump is the vacuum pump.When the number of working intervals is less than the presetting time threshold exceeding the total number of preset times, or when the working time of the vacuum pump is greater than or equal to the preset duration and less than the preset second duration, the control combination instrument is performed.Failure to alarm; Under the condition of any line of driving, when the working time of the real vacuum pump is greater than or equal to the preset second duration, the control combination instrument will perform the fault alarm, and further control the vacuum pump into the limited working mode, and the speed of the vehicle speedSpeed up control and make the vehicle enter the speed limit.The implementation of the present invention can improve the efficiency and accuracy of fault detection. Not only does the fault reminder, but also intervene in the vehicle's driving status during danger.
Description
Technical field[0001]The present invention relates to the field of electric vehicles, and in particular, to a fault detection and control method and apparatus for electric vehicle vacuum braking.Background technique[0002]Unlike traditional fuel vehicles, the energy of the electric vehicle is derived from a high pressure power battery, a super capacitor, and the like, and the motor is used instead of the internal combustion engine drive wheels to achieve the normal driving of the vehicle. Based on this factor, most of the electric vehicles at home and abroad use a vacuum pump to provide a vacuum source for the brake power system, and ultimately achieve braking function through the hydraulic brake system.[0003]In general, the electric vehicle will switch the vacuum pump according to the vacuum in the brake booster, that is, the vacuum pump is turned on after the vacuum is lower than one threshold, and the vacuum pump is turned off after the vacuum is higher than the other threshold. T...
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IPC IPC(8): B60T17/22
CPCB60T17/22
Inventor 孙建涛刘浪崔洋谷建东周成斌
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD