Study on the Backward Simulation Method Considering the Shifting Pattern of the P1-P2 Parallel Hybrid System

In this study, a backward simulation method that applies the shift map of a parallel hybrid system with P1-P2 motors was designed. The torque distribution optimization algorithm between the two motors, PI and P2, was applied, and a shift pattern comparable to the forward or actual vehicle test was implemented in the backward simulation results after considering shift hysteresis characteristics. By applying the shift map, it was confirmed that the number of shifts decreased by about 22.4 %, from 642 to 144, and unrealistically frequent shifts were prevented. Compared to the case where only the P2 motor was applied, and when the PI motor was additionally applied, fuel efficiency slightly increased from 24.4156 km/1 to 24.4311 km/1.