| 摘要 |
PURPOSE:To increase the accuracy in controlling the injection quantity of fuel, by providing an electrostatic capacity type potentiometer for detecting the operational position of a relief valve in a fuel injection pump of the type controlling the injection quantity of fuel by controlling the operational position of the relief valve. CONSTITUTION:A fuel injection pump shown in the drawing feeds fuel to an injection valve via passages 7-9, etc. after pressurizing fuel in a work space 6 by reciprocating a plunger 3 in the axial direction while causing rotation of the same by the rotation of a cam disk 2. Here, the injection quantity of fuel is controlled by controlling the operational position of a relief valve 29 for opening and closing a relief passage 11. The relief valve 29 consists of an annular permanent magnet 30 and electrode rings 32a, 32b made of a conductive material which are connected to the opposite ends of the permanent magnet 30 by the intermediary of magnetic pole pieces 31a, 31b, respectively. Further, operational position sensors 34a, 34b are attached to the opposite ends of an outside yoke 36 of an actuator 33 for displacing the relief valve 29, and the actuator 33 is feedback controlled in response to the outputs of the position sensors 34a, 34b. |
