GEOMETRY CONTROL METHOD OF A VEHICLE SUSPENSION FOR STABLY CONTROLLING THE SUSPENSION BY CONTROLLING DRIVING OF A CONSTRAINING UNIT WITH A CONTROLLER AND A CURRENT CONTROLLER

摘要

PURPOSE: A geometry control method of a vehicle suspension is provided to prevent excessive voltage from being applied on a constraining unit by regulating an output signal with a PID(Proportional Integral and Derivative) position controller and a PID current controller if vehicle steering angle and speed exceed a critical value. CONSTITUTION: A geometry control method of a vehicle suspension is composed of steps for detecting steering displacement and speed of a vehicle(S1); judging if the steering displacement and vehicle speed exceed a critical value of pre-set table data(S2); setting a target value for controlling position of the suspension when the steering displacement and vehicle speed exceed a critical value(S3); reading a present position value of the suspension(S4); subtracting the present position value from the target value for position-control of the suspension(S5); outputting a present current value for position-control of the suspension with a PID position controller with the subtracted value as an input value(S6); setting a current target value for position-control of the suspension(S7); subtracting the current target value output from the PID position controller from the current target value(S8); controlling to output the desirable current with a PID current controller with the subtracted value as the input value(S9); judging if the current output from the PID current controller reaches the target current(S10); returning to the first step when the current output from the PID current controller reaches the target current(S11); and executing continuously the eighth step for subtracting the present current value from the current target value until reaching the target current when the current output from the PID current controller reaches the target current(S12).