| 摘要 |
<p>A driven body displacement sensor comprising a brushless motor, capable of simplifying the structure of a flow control valve for controlling the flow rate of, for example, cooling water driven by a brushless motor, and of being miniaturized and reduced in cost. The opening of a flow control valve (11) for controlling the flow rate of cooling water fed to the radiator side is controlled by a brushless motor (11). A rectifying switch signal for driving the brushless motor (11) is received by a phase sequence detecting circuit (22a) to control an up-down counter (22b). A calculating circuit (22c) calculates the count of the counter (22b) and hence the opening of the flow control valve (11) can be grasped. The opening is fed back to an ECU to perform calculation with respect to the opening and other operation parameters, thereby realizing an ideal controller for controlling the cooling of an engine.</p> |
