Changan is embracing the trend of distributed e-drive powertrains to enhance vehicle dynamics. To explore this further, we at Changan UK conducted a study to evaluate the benefits of this powertrain topology, particularly its impact on vehicle dynamics on low-friction surfaces. We proposed that the supervisory control of the dynamic torque path for this powertrain be located in the rear axle dual inverter. This setup allows for low-latency monitoring of each wheel’s status and enables decision-making every 1ms, compared to the conventional 10ms in our current vehicle supervisory controller unit. This rapid response facilitates quick corrections in torque delivery to each wheel. In our study, the “master” inverter would manage the supervisory torque distribution control strategy, ensuring the appropriate torque level for each wheel. Additionally, each motor would have individual dynamic torque functions, such as lash crossing, advanced wheel slip control, and torque intervention strategies, to ensure smooth and accurate torque delivery under all conditions.

This presentation will showcase:

• The software architecture developed for this study
• The various control strategies necessary for optimal functionality
• How virtual testing has been utilized to guide the controller’s development