| 摘要 |
<p>PURPOSE:To improve the safety of motor power steering by limiting the output torque below a car speed limit indicating function even for excessive output from torque sensor due to malfunction of torque sensor or shortcircuit of wiring. CONSTITUTION:Power assist control under steering is executed by means of a motor 4 through control section 10 comprising a positive/negative deciding section 2, a motor drive section 3, an absolute value converting section 6, an output torque indicating function section 7, a duty control section 8, and an armature current detecting section 9. The control section 10 is further provided with a car speed sensor 11 and a car speed limit indicating function section 12 for providing a car speed limit indicating function which will decrease as the output from said sensor 11 will increase. Furthermore, an output torque limit deciding section 13 for producing a car speed limit indicating function is provided between said section 12, the output torque indicating function section 7 and the duty control section 8.</p> |
