Abstract:In order to determine the reasonable value of the braking force distribution ratio of commercial vehicles and improve the brake stability under different loads, an optimization design method of the braking force distribution ratio of vehicles based on load was proposed, which considers the effect of load on the centroid position. The requirements of vehicle braking performance were analyzed based on ECER13, the range of vehicle braking force distribution coefficient was determined, and the optimal distribution ratio was obtained with the constraint of the minimum square sum of the difference between the braking strength and the utilization adhesion coefficient. The design method was applied to the design calculation of heavy load, medium load and light load,and the brake simulation comparison and analysis were carried out. The results show that the design method of vehicle braking force distribution ratio based on load can meet the requirements of vehicle braking performance under different loads, and can effectively improve the safety of vehicle braking.The study provides reference for the control and adjustment of braking force distribution ratio of commercial vehicles.