Steuerventilstrategie für einen variablen Drehflügel einer Nockenwellenzeitsteuerungseinrichtung

摘要

An internal combustion engine includes a camshaft (40) and hub (30) secured to the camshaft (40) for rotation therewith, where a housing (20) circumscribes the hub (30) and is rotatable with the hub (30) and the camshaft (40), and is further oscillatable with respect to the hub (30) and camshaft (40). Driving vanes (22) are radially inwardly disposed in the housing (20)and cooperate with the hub (30), while driven vanes (32) are radially outwardly disposed in the hub (30) to cooperate with the housing (20) and also circumferentially alternate with the driving vanes (22) to define circumferentially alternating advance and retard chambers (28A/28R). A configuration for controlling the oscillation of the housing (20)relative to the hub (30) includes an electronic engine control unit (70), and an advancing control valve (50) that is responsive to the electronic engine control unit (70)and that regulates engine oil pressure to and from the advance chambers(28A). A retarding control valve (60) responsive to the electronic engine control unit (70) regulates engine oil pressure to and from the retard chambers (28R). An advancing passage (44) communicates engine oil pressure between the advancing control valve (50) and the advance chambers (28A), while a retarding passage (46) communicates engine oil pressure between the retarding control valve (60) and the retard chambers(28R).