Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2006-02-22
2010-02-23
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090170, C123S347000, C123S559200
Reexamination Certificate
active
07665433
ABSTRACT:
Surging is reliably prevented from occurring even when an engine with a turbocharger is operated with reduced number of cylinders and at a low speed range.Concerned is a method for controlling actuation of valves in an engine with a turbocharger, a variable valve mechanism18being arranged for controlling opening/closing timing and lifts of suction and exhaust valves (only exhaust valves17being shown in the figure) of each of cylinders8, an operation with reduced number of cylinders being made possible by the variable valve mechanism18such that valve-opening action of suction and exhaust valves in part of the cylinders8is disabled to conduct the operation with the remaining cylinders8. The exhaust valves17are opened substantially when a suction pressure is higher than an exhaust pressure in a suction stroke during the operation with the reduced number of cylinders at a low speed range, so that blown out amount of fresh air (suction air4) to the exhaust side is increased to increase apparent exhaust flow rate and raise the level of the suction characteristic of the engine.
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Chang Ching
Hino Motors Ltd.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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