Traction control of Hybrid Electric Vehicle

Slipping drive wheels can provide little lateral force, thus when drive wheels are slipping, the front wheel drive vehicles will lose turning ability, while the rear wheel drive vehicles will spin. Compared to the conventional vehicles, HEVs are more easily to slip when driving on the slippery road, since the electric motor can provide large drive torque under low speeds. In this paper, a traction control strategy for HEVs is proposed, and road tests are performed to verify its effectiveness. Considering that the electric motor responses much faster than the internal combustion engine, PID control and logic gate control are applied to them respectively. Both fuzzy PID control and ordinary PID control are adopted, and contrastive experiments are performed. Experiment results show that yet ordinary PID control can achieve approving control effect, the control effect of fuzzy PID control is better. Overall the experiment results show that the present traction control strategy can regulate the slip ratio within a specified range quickly and stably, and the throttle position of the engine changes slowly.