论文部分内容阅读
分析了ECE制动法规对多轴汽车制动力分配的要求,指出目前多轴汽车制动性能分析方法的不足,提出了基于ECE制动法规的利用附着系数图示法。在同一坐标系中画出汽车各轴的利用附着系数曲线和ECE制动法规边界曲线,通过分析各轴利用附着系数之间的位置关系及其与边界曲线之间的关系来研究汽车的制动性能。考虑到多轴汽车制动时轴荷转移较大的实际工况,在计算车轮地面法向反力时,采用簧上动载荷和簧下载荷分开计算模型。分析结果表明:当利用附着系数为0.20~0.80时,汽车具有较高的附着利用率;当制动强度为0.15~0.30时,车轮抱死顺序为前、中、后,符合车轮抱死顺序要求,能够保证汽车制动时的方向稳定性。可见,该分析方法简单、实用。
The requirements of ECE brake regulation on the braking force distribution of multi-axle vehicles are analyzed. At the same time, the limitations of current multi-axle vehicle braking performance analysis methods are pointed out. The drawing method of adhesion coefficient based on ECE braking regulations is proposed. In the same coordinate system draw the car with the use of adhesion coefficient curve and the ECE brake regulatory boundary curve by using the relationship between the adhesion coefficient of each axis and the relationship between the boundary curve to study the relationship between the brake performance. Taking into account the actual conditions of large axial load transfer during multi-axle vehicle braking, the spring loaded and unsprung loads are separately calculated when calculating the normal wheel-ground reaction force. The results show that when the adhesion coefficient is between 0.20 and 0.80, the car has a higher attachment and utilization rate. When the braking strength is between 0.15 and 0.30, the locking sequence of the wheels is before, after, and after the wheels are locked , To ensure the direction of the car when braking stability. Visible, the analysis method is simple and practical.