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AssigneeDaimlerChrysler AG
InventorsAndreas Juretzka, Klaus Rössler, Guido Vent
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The invention relates to a four-stroke internal combustion engine with compression ignition and internal exhaust gas recirulation by appropriate actuation of inlet and exhaust valves of at least one cylinder/piston unit. The invention provides for at least one inlet valve and at least one exhaust valve of the cylinder/piston unit to be actuable in such a way that the exhaust valve opening takes place before a charge-exchange top dead center position of a piston between an exhaust stroke and an intake stroke, and the exhaust valve closing takes place after this charge-exchange top dead center position at essentially the same time as the inlet valve opens, in order to displace exhaust gas from a combustion space of the cylinder/piston unit through the open exhaust valve into an exhaust duct and subsequently to suck it back from the exhaust duct into the combustion space.
A four stroke internal combustion engine with compression ignition comprising a cylinder with a piston disposed in said cylinder so as to be movable between top dead center and bottom dead center end positions, inlet and exhaust passages with inlet and exhaust valves for controlling combustion air flow to, and exhaust gas flow from, said cylinder, said exhaust valve being selectively operable so as to open, during an exhaust stroke, before the top dead center position of said piston and close only after the top dead center position of the piston and said inlet valve being operable so as to open about at the same time as said exhaust valve closes during the intake stroke, for sucking exhaust gas discharged into said exhaust duct during the exhaust stroke from the exhaust duct back into the cylinder at the beginning of the intake stroke and to fill the cylinder with fresh intake air during the remainder of the intake stroke when the exhaust valve is closed and the intake valve is open.
A method of controlling a four stroke internal combustion engine with compression ignition, including a cylinder with a piston disposed therein movably between a top dead center position and a bottom dead center position and with inlet and exhaust passages including inlet and exhaust valves for controlling combustion air flow to, and exhaust gas flow from, said cylinder, said method comprising the steps of:
Dependencies are inferred from the claim text.