Back to results
US 6,640,771 B2Granted
Internal combustion engine
AssigneeAVL List GmbH
InventorAlois Fuerhapter
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeAVL List GmbH
InventorAlois Fuerhapter
Estimating the term…
The invention relates to an internal combustion engine run on Otto fuel which may be compression ignition operated in a first operational range (HCCI) and spark ignition operated in a second operational range (SI), with means for adjusting valve timing of at least one intake valve (7) and of at least one exhaust valve (8), with at least one ignition equipment (18) and at least one direct injection equipment (17) in each cylinder (1). To permit in the easiest possible way compression ignition and spark ignition operation on Otto fuel, there is provided at least one intake camshaft (9) for actuating the intake valves (7) and at least one exhaust camshaft (10) for actuating the exhaust valves (8), that at least one intake valve (7) in each cylinder (1) is movable between a first and a second lift position by a device for changing the valve lift (11), and that at least one exhaust valve (8) is actuatable by a residual gas recirculation system (13) during the intake lift.
An internal combustion engine run on Otto fuel which may be compression ignition operated in a first operational range and spark ignition operated in a second operational range, with means for adjusting valve timing of at least one intake valve and of at least one exhaust valve, with at least one ignition equipment and at least one direct injection equipment in each cylinder, wherein there is provided at least one intake camshaft for actuating the intake valves and at least one exhaust camshaft for actuating the exhaust valves, wherein at least one intake valve in each cylinder is movable between a first and a second lift position by a device for changing the valve lift, and wherein at least one exhaust valve is actuatable by a residual gas recirculation system during an intake lift.
A method of operating an internal combustion engine run on Otto fuel which is compression ignition operated in a first operational range with an air-fuel ratio λ≧1 and spark ignition operated in a second operational range with an air-fuel ratio λ≦1, combustion being controlled by an internal residual gas recirculation at least, wherein a device for changing a valve lift of at least one intake valve in each cylinder is provided between a first and a second lift, wherein, in the first operational range of the engine, the lift of at least one intake valve is reduced from a second lift position into a first lift position and wherein the lift of said intake valve is increased from the first lift position to the second lift position in the second operational range of the engine.
Dependencies are inferred from the claim text.