Valve-timing control apparatus of internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsTsuyoshi Ishikawa, Kengo Kubo
Life of this patent
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Abstract
A valve-timing control apparatus of an internal combustion engine provides a valve timing controller capable of continuously and variably controlling the overlap period of an intake valve and an exhaust valve of an internal combustion engine. A driving-state determination mechanism determines the driving state of the internal combustion engine and an overlap-period setting apparatus sets the overlap period with the valve timing controller. The overlap-period is set during the start of the internal combustion engine on the basis of the determinations of the driving-state determination mechanism which vary as the internal combustion engine starts.
Claims16
A valve-timing control apparatus of an internal combustion engine, comprising:
- a valve timing controller that continuously and variably controls an overlap period of an intake valve and an exhaust valve of an internal combustion engine;
- driving-state determination means for determining a driving state of the internal combustion engine;
- overlap-period setting means for setting the overlap period with the valve timing controller, with the overlap-period setting means setting the overlap period during a start of the internal combustion engine based on determinations of the driving-state determination means which vary as the internal combustion engine starts, such that the overlap period increases as a temperature of an engine cooling fluid decreases;
- and
- ignition-timing setting means for setting an ignition timing of the internal combustion engine based on the determinations of the driving-state determination means, with the ignition-timing setting means setting the ignition timing during a cold start of the internal combustion engine based on the determinations of the driving-state determination means at the engine startup, such that the ignition timing is advanced as the valve overlap period increases.
A valve-timing control apparatus of an internal combustion engine, comprising:
- a valve timing controller that continuously and variably controls an overlap period of an intake valve and an exhaust valve of an internal combustion engine;
- a driving-state determination mechanism that determines a driving state of the internal combustion engine;
- an overlap-period setting apparatus that sets the overlap period with the valve timing controller, with the overlap-period setting apparatus setting the overlap period during a start of the internal combustion engine based on determinations of the driving-state determination mechanism which vary as the internal combustion engine starts, such that the overlap period increases as a temperature of an engine cooling fluid decreases;
- and
- an ignition-timing setting apparatus that sets an ignition timing of the internal combustion engine based on the determination of the driving-state determination mechanism, with the ignition-timing setting apparatus setting the ignition tuning during a cold start of the internal combustion engine based on determinations of the driving-state determination mechanism at the engine startup, such that the ignition timing is advanced as the valve overlap period increases.
A method for controlling valve timing of an internal combustion engine comprising:
- determining a driving state of the internal combustion engine;
- continuously and variably setting an overlap period of an intake valve and an exhaust valve of the internal combustion engine on based on determination of the driving state which varies as the internal combustion engine starts, with the valve overlap period varying in inverse proportion to a temperature of the engine;
- and
- setting an ignition timing during a cold start of the internal combustion engine based on the driving-state at the engine startup such that the ignition timing is advanced as the valve overlap period increases.
Dependencies are inferred from the claim text.