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US 4,815,423 AGranted
Method for controlling the working cycle of an internal combustion engine
AssigneeAB Volvo
InventorErnst Holmer
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AssigneeAB Volvo
InventorErnst Holmer
Estimating the term…
A method for controlling the working cycle of a four-stroke internal combustion piston engine with supercharging and direct fuel injection into each cylinder and with at least one inlet valve and one exhaust valve for each cylinder. The method involves opening the exhaust valve for a second time during each working cycle, in addition to holding the valve open during the exhaust expulsion stroke. According to the invention the exhaust valve is opened and closed for the second time during the compression stroke, the valve being opened when the piston is located in a first predetermined position at a distance form the lower dead center piston position and being closed when the piston is located in a second predetermined position at a distance from the lower dead center piston position greater than the first predetermined position. The inlet valve is closed during the inlet stroke, so that expansion of the air in the cylinder at full load subsequent to closing the valve is effected to or beneath the pressure in the exhaust system.
A method for controlling the working cycle of a four-stroke internal combustion piston engine with supercharging and direct fuel injection into each cylinder, where each cylinder presents at least one inlet valve and one exhaust valve, which method requires the exhaust valve of each cylinder to be opened a second time during each working cycle in addition to being held open during the exhaust scavenging stroke, characterized by opening and closing the exhaust valve for this second time during the compression stroke, and expelling gas from each cylinder through said exhaust valve throughout said second time, the exhaust valve being opened after commencement of the compression stroke when the piston is located in a first predetermined position distanced from the lower dead centre piston position, and closure of the exhaust valve taking place prior to completion of the compression stroke when the piston is located in a second predetermined position at a further distance from the lower dead centre piston position than the first predetermined position.
Dependencies are inferred from the claim text.