| 摘要 |
PURPOSE:To secure an accurate rear wheel steering angle and a feeling of comfort steering as well at all times by feedbacking an actual rear wheel steering angle, and thereby assuming control in such a way that a deviation between the actual rear wheel steering angle and a target rear wheel steering angle is canceled. CONSTITUTION:A target rear wheel steering angle operating means 100 operates a target rear wheel steering angle based on a steering angle, steering angular velocity, a yaw rate and vehicle speeds, and a spring partial pressure operating means 101 operates hydraulic pressure required to deflect a return spring which is necessary to acquire the target rear wheel steering angle. Following which, a deviation is given by a subtractor 104 by subtraction of the target rear wheel steering angle and an actual rear wheel steering angle found by an actual rear wheel steering angle sensor, and operations for cancelling the aforesaid deviation are performed by a PID control means 102, so that the result of the operations is outputted to an adder 105. In the adder 105, an output value computed by a spring partial pressure operating means 101 based on the target rear wheel steering angle is added to an output value from the PID control means, so that the result of the addition is thereby outputted to a solenoid driving section while rear wheels are therefore steered. |
