Automobile service braking efficiency dynamic monitoring and alarming system

Abstract

The invention provides an automobile service braking efficiency dynamic monitoring and alarming system, and belongs to the fields of automobile electronics and safety technologies. The system is characterized in that an output end of an original automobile card reader, an output end of an original automobile CAN bus, an output end of a gyroscope and an output end of a brake pedal sensor are connected with an input end of an information collection and control unit respectively; firstly, the information collection and control unit collects automobile pitch angles through the gyroscope, and the gradient of a monitored road is not more than 1%; secondly, the information collection and control unit detects the maximum deceleration of an automobile in the ABS working process, and the adhesion coefficient of the monitored road is not less than 0.7; thirdly, the information collection and control unit eliminates working conditions like pits, deceleration strips and road steps according to the maximum braking deceleration of the automobile; fourthly, the information collection and control unit monitors brake pedal strokes through the brake pedal displacement sensor so as to distinguish emergent brake working conditions. The CAN bus is used for collecting ABS wheel speed signals, the initial speed of braking is estimated in a maximum wheel speed method, MFDD is computed in real time combined with braking deceleration signals and is compared with a pre-stored standard value, and the compared result is sent to the alarming device to give an alarm to a driver. The automobile service braking efficiency dynamic monitoring and alarming system can carry out on-line monitoring and estimation on service braking efficiency and can be a great help for preventing traffic accidents caused by service braking efficiency abnormity, and is simple in structure, easy to realize and low in cost.

Description

technical field [0001] The utility model relates to a dynamic monitoring and alarm system for the braking performance of automobiles, which belongs to the technical field of automobile electronics and safety. Background technique [0002] Automobile braking performance is one of the important factors for safe driving, and it is also one of the important indicators for automobile safety performance testing. Braking performance is regularly tested in accordance with relevant national regulations, which plays an important role in ensuring driving safety. Analyzing the national road traffic accidents in 2009, among all traffic accidents, the proportion of motor vehicle mechanical failures accounted for about 5%, and traffic accidents directly caused by braking accounted for about 60% of the total number of mechanical failure accidents. Traffic accidents caused by braking are still common, and shortening the detection cycle will increase costs. With the development of electroni...

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Problems solved by technology

There are few related studies on online monitoring and evaluation technology of vehicle braking performance

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