Compensation for Heeling Error of MEMS Accelerator Sensor in Vehicle ABS

Precision of wheel speed and vehicle speed determines accuracy and reliability of ABS. When measuring vehicle speed, MEMS inertia accelerator sensor is usually adopted to carry out indirect measurement. For MEMS inertia accelerator sensor, output signal of accelerator sensor not only has relationship with vehicle accelerator, but also with heeling angle of MEMS inertia accelerator sensor. Transient heeling angle can be obtained by separating acceleration and heeling angle from output signal of MEMS inertia accelerator sensor. When compensating for MEMS inertia accelerator signal in braking process by separated heeling angle, feint accelerator error produced by single-axis MEMS inertia accelerator sensor can be basically eliminated. Then, accuracy increase of actual accelerator signal will improve brake control performance of ABS controller