串联混合电动汽车辅助功率单元输出控制

为使串联混合电动汽车的辅助功率单元和动力蓄电池的功率混合可控,由等效电路分析辅助功率单元的的电压、电流和功率三种输出控制方法,并同时提出了一种速度分级式功率控制算法。通过dSPACE原型控制器,调节电控柴油发动机的转速和无刷交流同步发电机的励磁电流,实现了辅助功率单元的三种输出控制方法。实验结果验证了三种控制方法分析的正确性,其中电压控制法最不易实现辅助功率单元和动力蓄电池的输出功率混合。速度分级式功率控制有效解决了发动机转速和发电机转矩控制的耦合问题,使辅助功率单元和动力蓄电池各自独立或联合为负载提供功率。

Output Control of an Auxiliary Power Unit of Series Hybrid Electric Vehicle

It is discussed that power is controlled from the auxiliary power unit (APU) and the traction attery package (TBP) in the series hybrid electric vehicle. The three methods of voltage, current, and power control of the APU are analyzed on the equivalent circuit in this paper. And a speed-level power follower algorithm is presented. All these are done on the dSPACE prototype controller. Both the diesel engine speed and the excitation current of the brushless AC synchronous generator are regulated. Experiment results validate the three algorithms right. It is most diffcult to hybrid power from the APU and TBP for the voltage control. Both the engine speed and generator torque are decoupled by the speed-level power follower, which makes the load powered freely by the APU, the TBP, and both of them respectively.