Patent ID: 11904865
Assignee: CHANG'AN UNIVERSITY
Field: Control (Instruments)
Classification: CPC B  G | IPC B

Claim 8:
9. An intelligent safe vehicle speed measurement method capable of considering a state of a road surface, comprising:
scanning the road surface to obtain a texture of the road surface, and performing stress simulation on vehicles with a variety of loads and tire patterns, to update tire-road surface contact relationships and corresponding braking distances;
obtaining a vehicle model, a load and tire information of an incoming vehicle, and obtaining a tire-road surface contact relationship, to select best matching data and provide a corresponding predicted braking distance;
obtaining environmental parameters of the road surface to correct the obtained predicted braking distance, and obtaining a safe running speed suitable for the incoming vehicle through conversion of the corrected braking distance; and
recommending the safe running speed for the incoming vehicle,
wherein the method further comprises:
performing contact simulation on vehicle tires and the scanned texture through a computer to obtain contact stress distributions, that is, the tire-road surface contact relationships;
predicting a braking distance of a vehicle by using a pre-stored regression curve of tire-road surface contact relationships and braking distances, and correcting the predicted braking distance based on a temperature, a humidity, a water film thickness, a snow thickness and an ice thickness of the road surface to obtain a real-time braking distance prediction result; and
inversely calculating a safe speed suitable for the vehicle based on the real-time braking distance prediction result in accordance with a distance to vehicles ahead, a road width, a turning radius and a visibility condition.