| 摘要 |
PURPOSE:To prevent sudden change of an assist force before and after the occurrence of abnormality, by a method wherein, when abnormality occurs to car speed detecting means, when a control value exceeds a fuel safe value, the control value is held at a control value right before detection of abnormality. CONSTITUTION:An oil pressure is fed through a control value 7 to a hydraulic cylinder 6 with the aid of a constant flow rate oil pump 8, a part of oil from the oil pump 8 is returned to the low pressure side through a bypass passage 9, and an electromagnetic valve 10, continuously varying a throttle amount according to a current, is located in the middle of the bypass passage. A voltage is fed to a solenoid 10a of the electromagnetic valve 10 from a control device 11, and a signal, e.g. a car speed, a steering speed, a mode switch, from a car speed sensor 12 serving as a car speed detecting means, is inputted to the control device 11. The control device 11 forms a control value set means, a fuel safe value set means, an abnormal detecting means, and a selecting means. |
