| 摘要 |
PROBLEM TO BE SOLVED: To resolve the fixedly attached state of a valve element to a valve seat caused by freezing of sticking oil by providing an alternating current supply means for supplying an alternating current to a driving solenoid, forming a valve element of a magnetic substance, and disposing the valve element so as to form a part of a magnetic path formed when a current is carried to the driving solenoid. SOLUTION: During the operation of a natural gas engine, an ECU 18 performs ignition control of the engine and injection valve opening/closing control of an injector 11 and performs overall control of the engine including an adjustment of fuel injection timing and a fuel injection quantity when driving the engine. The ECU 18 also performs heating control for resolving freezing of an injection valve at the start-up time of the engine, that is, an alternating current is made to flow to a solenoid coil 26 in the injector 11 to generate an eddy current in a valve element 22. The valve element 22 itself is thereby heated to release fixed attachment. The alternting current is supplied to the solenoid coil 26 from an alternating current supply means 36 provided in the ECU 18 through a switching means 37 and a connector 34. |
