METHOD FOR CONTROLLING REAR WHEEL STEERING

PURPOSE:To enhance a yaw resonance frequency so as to improve the responsiveness at the time of turning in a device controlling a rear wheel steering angle according to a front wheel steering by controlling rear wheels according to a specified transmission functions serially coupled with primary delay and secondary advance. CONSTITUTION:The steering quantity of front wheels following to the operation of a steering wheel 7 is detected by means of a potentiometer 17 for a steering angle sensor, and the output signal is sent to a rear wheel steering controller 20 via a preamplifier 19. Then a rear wheel steering is performed by driving a rear wheel controlling power cylinder 10 through the control of a servo motor 14 according to the steering of front wheels. In this case, the rear wheels are controlled in accordance with a transmission function G4(S) shown by the following formula: G4(S)=(BT1.T2S +(A+B)T2S+A)/(T1.T-2S +(T1+T2)S+1), where T1 is a constant at the time of primary delay time, T2 is a constant at the time of primary advance time, A is proportional normal number of primary delay element, B is a proportional normal number of primary advance element, and S is laplas operation element.