CONTROLLER FOR MOTOR POWER STEERING SYSTEM

摘要

PURPOSE:To improve the returning characteristic of steering wheel to the neutral position by driving a control circuit through an added signal of returning direction motor current command for returning the steering in straight advance direction with correspondence to the steering angle and assist direction motor current command level. CONSTITUTION:A multiplied signal of returning direction motor current command level from returning direction motor current indicating section 1 and a multiplying factor signal from multiplying factor setting section 3 is added with a signal from assist direction motor current indicating section 2 to produce an added signal which is fed to a control circuit 4. The control circuit 4 will decide the polarity of signal in positive/negative deciding section 41 thus to decide the output direction of motor through motor drive section 42. While an absolute value converting section 43 will produce the absolute value of signal which is compared with the output from an armature current detecting section 45 in duty control section 43 to determine the duty factor such that the motor current will be as indicated thus to control the motor drive section 42.