Research on Boost Control for Powertrain Control System

In the field of new energy vehicles, the role of the bidirectional DC/DC converter is of great significance. Based on the two-phase interleaved parallel BOOST topology, this paper adopts the approach of combining the double-loop PI controller with the feedforward control algorithm from the aspects of following target voltage and response speed respectively, and conducts research on the performance of the DC/DC converter in BOOST mode in terms of output voltage overshoot, steady-state error, and system adjustment time. The test results fully validate the feasibility and effectiveness of the design scheme. The test results indicate that the double-loop PI control + feedforward control method expedites the circuit response speed, reduces the steady-state error, and significantly reduces the input/output current ripple, fully verifying the feasibility and effectiveness of the control method. Furthermore, for the overvoltage issue that occurs after a large accelerator pedal in the hybrid vehicle with BOOST, the influence of post-overvoltage processing is analyzed emphatically, and the calibration strategy for the overvoltage problem is introduced. Among them, the fault handling mechanism for the BOOST software output overvoltage is that the BOOST upper and lower bridge software is blocked, and the P1/P3 software performs zero torque processing after receiving the BOOST software output overvoltage signal; after waiting for the BOOST fault to recover and enter the working mode, P1/P3 can operate in accordance with the current available power. Optimization calibration and real vehicle tests have been carried out. The test results demonstrate that the overvoltage problem can be effectively addressed by the adopted calibration method, and the drivability has been significantly enhanced.