Monitoring Method of Indirect TPMS Under Steering Situation
Conventional indirect tire pressure monitoring system (TPMS) is mainly designed according to the wheel speed signal of anti-lock brake system (ABS). Four wheels’ velocity change because yaw rate exists when vehicles are under steering conditions. The original tire pressure monitoring method failed which is based on the wheel speed comparison method. As the electronic stability program (ESP) is applied in vehicle, inertial measurement unit that can obtain vehicle’s yaw rate are widely used. In this passage, four-wheel trajectory model is established. Every wheel’s side-slip angle and steering radius can be deduced by using this model when the steering wheel in sinusoidal input and step input. Four wheels’ velocity can be quantified through turning radius, steering angle and yaw rate. On the basis of the original wheel speed comparison method, the indirect TPMS under steering situation can be achieved.