US 11,904,865 B2
Intelligent safe vehicle speed measurement method and system capable of considering state of road surface
Wei Jiang, Shaanxi (CN); Wanli Ye, Shaanxi (CN); Aimin Sha, Shaanxi (CN); Hao Lu, Shaanxi (CN); Dongdong Yuan, Shaanxi (CN); Jinhuan Shan, Shaanxi (CN); Pengfei Li, Shaanxi (CN); and Jingjing Xiao, Shaanxi (CN)
Assigned to CHANG'AN UNIVERSITY, Shaanxi (CN)
Filed by CHANG'AN UNIVERSITY, Shaanxi (CN)
Filed on Feb. 14, 2022, as Appl. No. 17/670,527.
Application 17/670,527 is a continuation of application No. PCT/CN2020/105375, filed on Jul. 29, 2020.
Claims priority of application No. 201911304791.6 (CN), filed on Dec. 17, 2019.
Prior Publication US 2022/0161802 A1, May 26, 2022
Int. Cl. B60W 40/06 (2012.01); B60W 40/105 (2012.01); B60W 50/14 (2020.01)
CPC B60W 40/06 (2013.01) [B60W 40/105 (2013.01); B60W 50/14 (2013.01); B60W 2420/42 (2013.01); B60W 2420/62 (2013.01); B60W 2530/20 (2013.01); B60W 2556/45 (2020.02)] 9 Claims
OG exemplary drawing
 
1. An intelligent safe vehicle speed measurement system capable of considering a state of a road surface, comprising: a power supply unit, a warning reminder unit, a laser scanning unit, a skid resistance prediction unit, and a wireless communication unit, wherein
the laser scanning unit is configured to: scan the road surface to obtain a texture of the road surface, and perform stress simulation on vehicles with a variety of loads and tire patterns, to update tire-road surface contact relationships and corresponding braking distances;
the wireless communication unit is configured to: obtain a vehicle model, a load and tire information of an incoming vehicle, and obtain a tire-road surface contact relationship, to select best matching data and obtain a predicted braking distance;
the skid resistance prediction unit is configured to: obtain environmental parameters of the road surface to correct the obtained predicted braking distance, and obtain a safe running speed suitable for the incoming vehicle through conversion of the corrected braking distance;
the warning reminder unit is configured to recommend the safe running speed for the incoming vehicle; and
the power supply unit is configured to supply electric energy for the warning reminder unit,
the laser scanning unit, the skid resistance prediction unit, and the wireless communication unit,
wherein the skid resistance prediction unit further comprises a finite element tire-road surface contact module, a braking distance prediction module, and an environmental response module,
wherein the finite element tire-road surface contact module is configured to perform 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;
the braking distance prediction module is configured to: predict a braking distance of a vehicle by using a pre-stored regression curve of tire-road surface contact relationships and braking distances, and correct 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
the environmental response module is configured to inversely calculate 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.