自励式缓速器制动力矩控制方法

Control method of braking torque for self-excited retarder

为实现自励式缓速器制动力矩的智能化控制,以流过励磁线圈的电流为基准划分了制动力矩档位,提出了以可控硅导电角为控制对象的制动力矩控制方法.分析了励磁线圈驱动电路及可控硅导电角触发电路,并基于可控硅导电角时序图,推导了各种档位下可控硅导电角的计算公式及低车速时最高档位判别公式,为实现自励式缓速器制动力矩的智能化控制提供了理论指导.试验测试结果表明,自励式缓速器可基本上实现制动力矩控制的精确性和实时性.

To realize the intelligent control on the braking torque of a self-excited retarder, the excitation current was taken as a reference for dividing the braking torque gear. Taking SCR＇s conduction angle as a control object, the control method of the braking torque was presented. The theoretical driving circuit of an excitation coil and the trigger circuit of SCR＇s conduction angle were discussed. The caculation formu- lae of SCR＇s conduction angle in various working conditions and the discriminant functions of the highest gear in low speed were deduced based on the sequence diagram of SCR＇s conduction angle. After verifi- cation by experiment, the control method basically achieves the real-time and accurate control on braking torque. This would lay a theoretical basis for realizing intelligent control on the braking torque of a self- excited retarder.