Control device for power steering apparatus

A control device for a power steering apparatus comprising:

• a vehicle speed signal generating circuit for generating a vehicle speed signal corresponding to an actual vehicle speed, said vehicle speed signal generating circuit including a vehicle speed pulse generator having a vehicle speed sensor and a waveshaper for generating short vehicle speed pulses at OFF timings of said vehicle speed sensor, and an instantaneous vehicle speed generator including a counter for counting first clock pulses and a register for receiving a count from said counter in response to each vehicle speed pulse from said vehicle speed pulse generator, said instantaneous vehicle speed generator being adapted to generate an instantaneous vehicle speed signal as the vehicle speed signal;
• a steering angle signal generator for detecting a steering angle and generating a steering angle signal, said steering angle signal generator including a potentiometer serving as a steering sensor and an analog-to-digital converter for converting an analog signal from said potentiometer to a digital signal representing the steering angle signal;
• means for generating a power steering signal determined in correspondence with the vehicle speed signal, said power steering signal generating means including a pattern memory for storing a signal for determining a power steering signal corresponding to the instantaneous speed signal at the start of steering;
• means for generating a correction signal determined in correspondence with the vehicle speed signal and the steering angle signal representing a steering angle with respect to a neutral position of a steering wheel;
• and
• means for outputting a correction result by correcting the power steering signal by the correction signal.