中文摘要：

为了考察电机与缓速器联合制动时对汽车制动性能的影响，以理想的汽车前、后制动器制动力分配曲线为基础，导出引入电机制动力和缓速器制动力的新的前、后制动器制动力分配曲线。将反映制动性能的制动力利用率作为评价指标，针对某型客车，分析了在多种路面上、联合制动的制动力利用率与电机转速的关系。研究结果表明：当缓速器工作在低档，在湿滑路面上制动时，制动力利用率与电机转速成正比，在干燥良好路面上制动时，制动力利用率与电机转速成反比；当缓速器工作在高档，在所有路面上、制动力利用率与电机转速成反比。

英文摘要：

The influence of the combined brake of motor and retarder＇s on the braking performance was investigated.Based on the ideal braking force distribution curves between front and rear arresters, the new braking force distribution curves including motor and retarder＇s braking force was derived. The utilization ratio of braking force reflecting braking performance was an important evaluationg indicator. For a mini-bus, the relationship between the braking force utilization ratio and the motor＇s speed was analyzed. The results indicate that at the low grade of retarder working, the braking force utilization ratio is proportional to motor＇s speed for the wet or slippery road braking, also the braking force utilization ratio is inversely proportional to motor＇s speed for the dry road braking. Secondly, at the high grade of retarder working, the braking force utilization reatio is inversely proportional to motor＇s speed for all kind of roads braking.