Active braking method based on VANET wireless short-range communications

Abstract

The invention discloses an active braking method based on VANET wireless short-range communications. The active braking method comprises the following steps of: acquiring a vehicle speed signal V<0> of a vehicle A<0>; calculating a vehicle accelerated speed according to the vehicle speed signal V<0> obtained in the step 1; obtaining a reference gradient G<2> of a road surface according to data G<0> obtained by a road surface gradient sensor and the influence G<1> of the vehicle accelerated speed on the data obtained by the road surface gradient sensor, wherein G<2>=G<0>-G<1>; calculating a vehicle slip rate S through a signal of a wheel speed sensor, calculating a wheel longitudinal force F<x> through a signal of a wheel vertical load sensor, and further calculating a road surface adhesion coefficient mu<max> through the vehicle slip rate S, the wheel longitudinal force F<x> and a signal of a wheel cylinder pressure sensor; and step 4, starting a vehicle networking module, and performing networking with surrounding vehicles so as to obtain the data of the surrounding vehicles. According to the active braking method disclosed by the invention, a more accurate safety distance can be calculated in a real time manner under travelling conditions of different road surface gradients, different road surface adhesion coefficients, different vehicle speeds, and the like, and the reliability, the security and the stability are greatly improved.

Description

technical field [0001] The invention relates to an active braking method based on VANET wireless short-range communication. Background technique [0002] At present, when the car is driving, the brakes are basically controlled by the driver. When the driver is tired and deserted, it is easy to cause a car accident and hit an obstacle in front. The existing electronic equipment basically cannot actively brake. Avoid car accidents. [0003] The Chinese patent with application number 201410677906.7 discloses an intelligent control method and device for emergency braking based on Internet of Vehicles, including a GPS module, a CAN bus module, a wireless communication module and a data processing module. It can remind the driver and apply the brakes when the distance between the vehicle and the vehicle, obstacle or pedestrian in front is less than the safe distance, but this invention has obvious defects, that is, ① the invention does not consider the problem of road gradient, w...

AI Technical Summary

Problems solved by technology

It can remind the driver and apply the brakes when the distance between the vehicle and the vehicle, obstacle or pedestrian in front is less than the safe distance, but this invention has obvious defects, that is, ① the invention does not consider the problem of road gradient, when the vehicle is descending a steep slope When the safety distance calculated by the controller is too small, it will cause a great potential safety hazard, and accidents will easily occur when the driver relies too much on this invention; Therefore, when driving on ice and snow roads, the controller calculates too small a safety distance, causing potential safety hazards and vehicle rear-end collision accidents; The safety distance is too large, the road resources cannot be fully utilized, and it is a waste of crowded urban road resources

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