| 摘要 |
PURPOSE:To monitor the electric wave of a linear solenoid in an accurate manner by connecting a potential difference compensation means to an interval between a resistance element and a power earth, while having the current of a solenoid driving means turned off by a control means when something wrong with a monitor current value. CONSTITUTION:A potential difference compensation means 11 is connected to an interval between a resistance element 10 and a power earth, while each of control means 3, 4, 6, 7 monitors each voltage value at both sides of a resistance element 10, detecting the value of a current flowing into a solenoid 13, so that even if there is potential difference between the power earth connected with the resistance element 10 and a signal earth connected with the control means, it is able to detect the voltage proportioned to the current valve irrespective of this potential difference and, what is more, control accuracy can be enhanced. In addition, each control means has the current of a solenoid driving means 5 turned off when the value of the current flowing into the solenoid 13 is abnormal, or a switching means of the potential difference compensation means 11 turned off when it is abnormal, thus any excessive current is prevented from flowing even in a short-circuit accident. |
