Start-up control for internal combustion engine
First Claim
1. A start-up control device for an internal combustion engine, comprising:
- a device which supplies a fuel to the internal combustion engine;
a starter motor which cranks the internal combustion engine;
a sensor which detects an engine rotation speed of the internal combustion engine;
a sensor which detects an operating parameter other than the engine rotation speed of the internal combustion engine;
an effective compression ratio modifying mechanism which alters an effective compression ratio of the internal combustion engine from an effective compression ratio for a start-up operation to a larger effective compression ratio for a normal operation when the engine rotation speed increases beyond a resonance rotation speed region during cranking; and
a programmable controller programmed to;
determine whether or not the internal combustion engine has reached a combustion possible state on the basis of the engine rotation speed during cranking and the operating parameter other than the engine rotation speed; and
inhibit fuel supply by the fuel supply device when the internal combustion engine has not reached the combustion possible state, even when the engine rotation speed has increased beyond the resonance rotation speed region.
1 Assignment
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Accused Products
Abstract
An internal combustion engine (101, 601, 901) alters an effective compression ratio from an effective compression ratio for a start-up operation to a larger effective compression ratio for a normal operation when an engine rotation speed (NE) increases beyond a resonance rotation speed region during cranking. A controller (104, 610, 910) determines whether or not the engine (101, 601, 901) has reached a combustion possible state on the basis of the engine rotation speed (NE) during cranking and an operating parameter (PA, TA, TW, P_Rail, V_Ang) other than the engine rotation speed (NE) (S1102, S1202, S1204). When the determination is negative, the controller (104, 610, 910) inhibits fuel supply to the engine (101, 601, 901) by a fuel supply device (207), even when the engine rotation speed has increased beyond the resonance rotation speed region (S406). In so doing, a combustion defect such as a misfire is prevented.
15 Citations
13 Claims
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1. A start-up control device for an internal combustion engine, comprising:
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a device which supplies a fuel to the internal combustion engine; a starter motor which cranks the internal combustion engine; a sensor which detects an engine rotation speed of the internal combustion engine; a sensor which detects an operating parameter other than the engine rotation speed of the internal combustion engine; an effective compression ratio modifying mechanism which alters an effective compression ratio of the internal combustion engine from an effective compression ratio for a start-up operation to a larger effective compression ratio for a normal operation when the engine rotation speed increases beyond a resonance rotation speed region during cranking; and a programmable controller programmed to; determine whether or not the internal combustion engine has reached a combustion possible state on the basis of the engine rotation speed during cranking and the operating parameter other than the engine rotation speed; and inhibit fuel supply by the fuel supply device when the internal combustion engine has not reached the combustion possible state, even when the engine rotation speed has increased beyond the resonance rotation speed region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A start-up control device for an internal combustion engine, comprising:
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means for supplying a fuel to the internal combustion engine; a starter motor which cranks the internal combustion engine; means for detecting an engine rotation speed of the internal combustion engine; means for detecting an operating parameter other than the engine rotation speed of the internal combustion engine; means for altering an effective compression ratio of the internal combustion engine from an effective compression ratio for a start-up operation to a larger effective compression ratio for a normal operation when the engine rotation speed increases beyond a resonance rotation speed region during cranking; means for determining whether or not the internal combustion engine has reached a combustion possible state on the basis of the engine rotation speed during cranking and the operating parameter other than the engine rotation speed; and means for inhibiting fuel supply by the fuel supplying means when the internal combustion engine has not reached the combustion possible state, even when the engine rotation speed has increased beyond the resonance rotation speed region.
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13. A start-up control method for an internal combustion engine, the engine comprising a device which supplies a fuel to the internal combustion engine, a starter motor which cranks the internal combustion engine, a sensor which detects an engine rotation speed of the internal combustion engine, and an effective compression ratio modifying mechanism which alters an effective compression ratio of the internal combustion engine from an effective compression ratio for a start-up operation to a larger effective compression ratio for a normal operation when the engine rotation speed increases beyond a resonance rotation speed region during cranking, the method comprising:
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detecting an operating parameter other than the engine rotation speed of the internal combustion engine; determining whether or not the internal combustion engine has reached a combustion possible state on the basis of the engine rotation speed during cranking and the operating parameter other than the engine rotation speed; and inhibiting fuel supply by the fuel supply device when the internal combustion engine has not reached the combustion possible state, even when the engine rotation speed has increased beyond the resonance rotation speed region.
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Specification