Solenoid valve driving circuit, solenoid valve, and solenoid valve driving method
AssigneeSMC Corporation
InventorsYoshihiro Fukano, Shigeharu Oide, Takayoshi Hatou, Hidenori Ogawa
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Abstract
A solenoid valve driving circuit for a solenoid valve includes a current detector for detecting a current that flows in a solenoid coil, a rate of change over time calculating unit for calculating a rate of change over time of the detected current, and a maintaining state transition determining unit for determining a timing at which transition from a first period to a second period occurs based on the calculated rate of change over time.
Claims10
A solenoid valve driving circuit for driving a solenoid valve by applying a first voltage with respect to a solenoid coil of the solenoid valve during a first period, and for maintaining a driven state of the solenoid valve by applying a second voltage with respect to the solenoid coil during a second period following the first period, comprising:
- a current detector for detecting a current that flows in the solenoid coil;
- a rate of change over time calculating unit for calculating a rate of change over time of the current;
- and
- a maintaining state transition determining unit for determining transition from the first period to the second period based on the rate of change over time.
A solenoid valve including a solenoid valve driving circuit for driving the solenoid valve by applying a first voltage with respect to a solenoid coil of the solenoid valve during a first period, and for maintaining a driven state of the solenoid valve by applying a second voltage with respect to the solenoid coil during a second period following the first period,
- the solenoid valve driving circuit comprising:
- a current detector for detecting a current that flows in the solenoid coil;
- a rate of change over time calculating unit for calculating a rate of change over time of the current;
- and
- a maintaining state transition determining unit for determining transition from the first period to the second period based on the rate of change over time.
A solenoid valve driving method for driving a solenoid valve by applying a first voltage with respect to a solenoid coil of the solenoid valve during a first period, and for maintaining a driven state of the solenoid valve by applying a second voltage with respect to the solenoid coil during a second period following the first period, comprising the steps of:
- detecting a current that flows in the solenoid coil;
- calculating a rate of change over time of the current;
- and
- determining transition from the first period to the second period based on the rate of change over time.
Dependencies are inferred from the claim text.