Abstract: As a new drive system for electric vehicles, the dual-mode coupling drive system can automatically switch between centralized and distributed drive modes and realize two-speed gear shifting. Because the actuator’s displacement signal affects the mode-switching control, when failure occurs at the angle-displacement sensor, the mode-shifting quality is likely to drop greatly, even possibly leading to shift failure. To address the angle-displacement sensor failure and improve the reliability of the shift control, an adaptive fault-tolerant control method is proposed and verified. First, the effect of the output signal of the angle-displacement sensor in the mode-switching control process is analyzed. Then, an adaptive mode-switching fault-tolerant control method is designed based on the Kalman filter and fuzzy theory. Finally, the feasibility of the control effect is verified through simulations and vehicle experiments. The results indicate that the proposed method can effectively eliminate the signal noise of the angle-displacement sensor and successfully switch the modes when the sensor fails. It provides a reference for ensuring the working quality of similar electric drive systems under sensor failures.

Key words: Electric vehicle · Dual-mode coupling drive system · Mode-switching control · Kalman fltering · Sensor faulttolerant control