| 摘要 |
<p>PURPOSE:To suppress the cost resulting from provision of sensor and eliminate increase of the man-hours for the same purpose by calculating the thrust force of the rack shaft of a gear box, controlling the output of a motor with this thrust force, and thereby eliminating a thrust force sensor. CONSTITUTION:A torque signal (a) is entered into an A/D conversion part 4a of a CPU 4, while a car speed signal (b) is input directly to a CPU 4. From the signals (a), (b) the CPU 4 determines a rack thrust force value (c) as a command value from a map of the rack thrust force vs. torque, gives it to a D/A converter 5, and emits a right signal (d) and a left signal (e) for determination of the motor rotating direction. An analogous rack thrust force value 5c given by this D/A converter 5 is compared by a comparator 6 with a rack thrust force value 25c which was fed from a rack shaft thrust force sensor 25 via a filter 25a and an amplifier 25b. When the value 5c is greater than the value 25c, a signal of '1' is given from an And circuit 7, and a driver part 9 drives a transistor 14 while another driver part 12 drives a transistor 17. Thus the motor 18 is rotated to the right.</p> |
