LAUSR

Aiming at the problem that the existing stopping sight distance model is out of sync with the development of the times, this paper puts forward a new stopping sight distance model considering the fuzziness and randomness of design parameters, and deduces the calculation method of fuzzy reliability of stopping sight distance. Firstly, the actual braking process of vehicle is divided into three stages: driver’s reaction stage, braking force rising stage and continuous braking stage. Based on MATLAB/Simulink software, the calculation model of complete braking stage is simulated and analyzed, and then the calculation model of stopping sight distance of ESC system is proposed. Secondly, considering the fuzziness of operating speed, the fuzzy reliability theory is introduced to establish the function of the fuzzy reliability of the stopping sight distance. Using the Gaussian fuzzy number and the center point method, the reliability index and failure probability of stopping sight distance are obtained, and the safety and reliability of stopping sight distance are described. Finally, according to the “Unified Standard for Reliability Design of Highway Engineering Structures”, the traditional reliability calculation method and fuzzy reliability calculation method are respectively used to calculate the stopping sight distance value corresponding to the highway safety level. Taking the calculated value of ESC system stopping sight distance model at the design speed of 120 km/h as a reference, the reliability index and failure probability of the two reliability calculation methods are calculated. The results show that the new stopping sight distance model is closer to reality than the existing stopping sight distance model in the continuous braking stage. Compared with the traditional reliability calculation method, the fuzzy reliability calculation method has high reliability index, low failure probability and high calculation accuracy. Implementing road design based on the stopping sight distance value calculated by the new stopping sight distance model and fuzzy reliability theory can improve road safety.