| 摘要 |
PROBLEM TO BE SOLVED: To restrain failures such as blow-off of flame of a cooking stove burner due to spontaneous change of a position of a valve body of a latch type electromagnetic valve arranged in a gas flow passage.SOLUTION: A latch type electromagnetic valve causes intermediate suction force for closing a valve to suck a plunger by conducting an intermediate current for closing the valve with a smaller absolute value than that of a current for closing the valve under a valve opening state, and energization force by a spring keeps a balance of a sum of the intermediate suction force for closing the valve and suction force due to magnetic force of a permanent magnet, so that an opening degree of the latch type electromagnetic valve can be maintained to an intermediate opening degree during closing the valve between the valve closing state and a valve opening state. When the latch type electromagnetic valve under the valve opening state is closed, a period from start of electric conduction to a coil of the latch type electromagnetic valve to stop of electric conduction is controlled to be not shorter than a predetermined period. |
