| 摘要 |
PROBLEM TO BE SOLVED: To eliminate some defects found in the conventional fire power adjustment device that, when a rotating phase estimated from the number of supply pulses shows a displacement against an actual rotating phase due to loss of synchronization and the like, it is required that a rotational position sensor detects the actual rotating phase and, if it is detected that an opening/closing valve remains under its opened state, a motor is forcedly driven to close the opening/closing valve; however, when the rotating position sensor shows a trouble such as breaking of wire and a short circuit, the actual rotating phase of the motor cannot be detected.SOLUTION: A waiting position is set at a valve closing side position from a position where an opening/closing mechanism is opened or closed by a cam for an opening/closing valve, and a switch is provided for use in detecting that the cam for the opening/closing valve is located between the waiting position and the position where the opening/closing mechanism is opened or closed. |
