Internal combustion engine start-up control

A variable valve mechanism ( 12 a , 12 b) varies a lift amount and an opening/closing timing of an intake valve ( 10 ) of an internal combustion engine ( 1 ). During a first period in an engine start operation, wall flow is suppressed by setting the lift amount of the intake valve ( 10 ) to be small...

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Bibliographische Detailangaben
Hauptverfasser:	SATOU RITSUO, WATANABE SATOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES ENGINE PLANTS IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	A variable valve mechanism ( 12 a , 12 b) varies a lift amount and an opening/closing timing of an intake valve ( 10 ) of an internal combustion engine ( 1 ). During a first period in an engine start operation, wall flow is suppressed by setting the lift amount of the intake valve ( 10 ) to be smaller so as to increase the intake air velocity. During a second period, which starts after the first period ends, the atomization of injected fuel is enhanced by increasing a valve overlap amount between the intake valve ( 10 ) and an exhaust valve ( 11 ) so as to promote blow-back of the combustion gas to an intake port ( 4 ). By sequentially applying a process for increasing the intake air velocity and a process for increasing the valve overlap amount, the emission of unburned hydrocarbon during the engine start is effectively reduced.