The Study On The Strategy And Hardware In The Loop Simulation (HILS) Of Regenerative Braking Based On The Double Clutch Structure For Hybrid Electric Vehicle

Hybrid electric vehicle (HEV), which combines advantages of the outstanding dynamic performance and drive mileage of traditional vehicle and low emissions of electric vehicle, is currently best feasible eco-friendly vehicle.Regenerative braking technology is a key technology of HEV, which has a direct effect on fuel consumption, driving stability and braking security. The braking force of Chang'an ISG HEV is consisted of the braking forces generated by air resistance and rolling resistance, brake force, regenerative braking force of motor, drag braking force of engine. A part of braking energy is only recovered by the motor, but the powertrain with double clutches is adopted to eliminate the effect of drag braking force of engine and recover more braking energy.In connection with Chang'an ISG hybrid power system in the paper, the theoretical analyses and test research of regenerative braking system for hybrid power system with double clutches is carried out. The main contents are shown as following:①According to the characteristic of hybrid power system with double clutches, cam mechanism driven by the direct current motor is adopted as clutch actuator. According to the parameters of clutch and requirements of control, combined with the software CATIA, the whole scheme design of clutch actuator is accomplished, and movement simulation of actuator is performed, which validates the feasibility of design scheme.②The operation states of HEV with double clutches under different conditions are analyzed, and the model of the powertrain with double clutches is established. Combined with the clutch working characteristic and control requirement, proper parameters are selected and the fuzzy controller of engagement control for clutch is designed.③The factors affecting the energy recovery of regenerative braking for HEV are studied. The configurations of regenerative braking system for HVE with double clutches and operation characteristics are analyzed, based on ECE braking code, and the control strategy for brake force distribution to maximize energy recovery is put forward.④The performance test bench for clutch actuator is built, and the test control system is developed using Matlab/Simulink and the dSPACE real-time control tool and the software ControlDesk. Then the Pulse-Width Modulation (PWM) timing control test and the target signal response test with various frequency are carried out.⑤The test platform of Hardware in a loop simulation (HILS) for the regenerative braking system of HEV with double clutches is built by utilizing the block of engine, ISG motor and battery and the clutch and its actuator. Tests under some classic operation conditions are performed, and the test results show the distribution control strategy of braking force put forward in the paper increases the braking energy recovery quantum and improves its coefficient.