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US 7,623,328 B2Granted
Driving control apparatus for motion mechanism and control method of driving control apparatus
AssigneeHitachi, Ltd.
InventorsKenichi Machida, Hidekazu Yoshizawa
Life of this patent
Estimating the term…
Abstract
When a variable valve mechanism which varies an opening characteristic of an engine valve is malfunctioned, the power supply to a drive circuit for the variable valve mechanism is stopped, and also a control signal to the drive circuit is cleared.
Claims6
A driving control apparatus for a motion mechanism, comprising:
- a motion mechanism configured to vary an operation characteristic of an engine valve, said motion mechanism being disposed in an engine;
- a motor configured to operate said motion mechanism;
- a drive circuit configured to drive said motor;
- and
- a control unit configured to:
- output a control signal to said drive circuit;
- detect whether or not said motion mechanism is malfunctioning;
- stop outputting the control signal to said drive circuit when it is detected that said motion mechanism is malfunctioning;
- determine that said drive circuit is malfunctioning when a current of said motor is equal to or larger than a predetermined value after output of said control signal is stopped;
- and
- stop power supplied to said drive circuit when it is determined that said drive circuit is malfunctioning.
8 more elements
A control method of a driving apparatus for a motion mechanism, said apparatus being provided with:
- a motion mechanism configured to vary an operation characteristic of an engine valve, said motion mechanism being disposed in an engine;
- a motor configured to operate said motion mechanism;
- and a drive circuit configured to drive said motor by inputting a control signal, the control method comprising the steps of:
- detecting whether or not said motion mechanism is malfunctioning;
- stopping outputting of the control signal to said drive circuit when it is detected that said motion mechanism is malfunctioning;
- determining that said drive circuit is malfunctioning when a current of said motor is equal to or larger than a predetermined value after output of said control signal is stopped;
- and
- stopping power supplied to said drive circuit when it is determined that said drive circuit is malfunctioning.
5 more elements
A driving control apparatus for a motion mechanism, comprising:
- a motion mechanism configured to vary an operation characteristic of an engine valve, said motion mechanism being disposed in an engine;
- a motor that operates said motion mechanism;
- a drive circuit that drives said motor;
- control means for outputting a control signal to said drive circuit;
- detecting means for detecting whether or not said motion mechanism is malfunctioning;
- a first stopping means for stopping outputting of the control signal to said drive circuit when it is detected that said motion mechanism is malfunctioning;
- a determining means for determining that said drive circuit is malfunctioning when a current of said motor is equal to or larger than a predetermined value after output of said control signal is stopped;
- and
- a second stopping means for stopping power supplied to said drive circuit when it is determined that said drive circuit is malfunctioning.
6 more elements
Dependencies are inferred from the claim text.