Control apparatus of variable valve timing mechanism and method thereof
AssigneeHitachi Unisia Automotive, Ltd.
InventorRyo Miyakoshi
Life of this patent
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Abstract
In a variable valve timing mechanism that changes a rotation phase of a camshaft with respect to a crankshaft by an actuator to vary valve timing of engine valves, when a fixed condition of the rotation phase is detected, the actuator is forcibly driven, to generate a torque alternately in an advance direction and a retarded direction of the rotation phase.
Claims20
A control apparatus of a variable valve timing mechanism that changes a rotation phase of a camshaft with respect to a crankshaft by an actuator to vary valve timing of engine valves, comprising:
- a fixed condition detector that detects a fixed condition of said rotation phase;
- and
- a control unit that controls said actuator according to a target value of said rotation phase, and also, when the fixed condition of said rotation phase is detected, forcibly drives said actuator, to generate a torque alternately in an advance direction and a retarded direction of said rotation phase.
A control apparatus of a variable valve timing mechanism that changes a rotation phase of a camshaft with respect to a crankshaft by an actuator to vary valve timing of engine valves, comprising:
- fixed condition detecting means for detecting a fixed condition of said rotation phase;
- and
- fixed condition releasing means for, when the fixed condition of said rotation phase is detected, forcibly driving said actuator, to generate a torque alternately in an advance direction and a retarded direction of said rotation phase.
A control method of a variable valve timing mechanism that changes a rotation phase of a camshaft with respect to a crankshaft by an actuator to vary valve timing of engine valves, comprising the steps of:
- detecting a fixed condition of said rotation phase;
- and
- when the fixed condition of said rotation phase is detected, forcibly driving said actuator, to generate a torque alternately in an advance direction and a retarded direction of said rotation phase.
Dependencies are inferred from the claim text.