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US 2017/0284312 A1Published application
Method for performing a charge exchange in an internal combustion engine
AssigneeFord Global Technologies, LLC
InventorsJoerg Kemmerling, Franz Arnd Sommerhoff, Helmut Matthias Kindl, Vanco Smiljanovski, Claudia Katharina Herudek, Andreas Kuske
Life of this patent
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Abstract
A method and system for perform a charge exchange in internal combustion engine comprising an additional intake and exhaust valve lifts performed during positive pressure gradients between the intake and exhaust systems to reducing scavenging losses and increase torque during low engine speeds.
Claims16
A system for performing a charge exchange in an internal combustion engine comprising:
- at least one cylinder head with at least one cylinder, each cylinder having at least one inlet opening for the supply of fresh air via an intake system and having at least one outlet opening for discharging exhaust gases via an exhaust-gas discharge system and having a piston which is movable along a piston longitudinal axis between a bottom dead center and a top dead center, and
- at least two valve drives with at least two valves which are movable along their longitudinal axes between a valve closed position and a valve open position, performing a maximum valve lift, in order to open up and block the at least one inlet opening and the at least one outlet opening of the at least one cylinder during the course of a charge exchange, and having at least two actuating devices for opening the valves counter to a preload force,
- wherein an inlet valve of the at least one inlet opening is actuated to perform an additional valve lift before the piston, during the course of the charge exchange, reaches top dead center and before the inlet valve, during the course of the charge exchange, performs the maximum valve lift, and
- wherein an outlet valve of the at least one outlet opening is actuated to perform an additional valve lift before the piston, during the course of the charge exchange, reaches bottom dead center and after the outlet valve, during the course of the charge exchange, has performed the maximum valve lift.
1 more element
A method for an engine comprising:
- opening at least one exhaust valve to maximum valve lift during a charge exchange of a combustion chamber comprising a piston;
- actuating at least one intake valve before the piston reaches top dead center of the combustion chamber during the charge exchange to perform an additional intake valve lift in response to an intake pressure being greater than an exhaust pressure;
- opening at least one inlet valve to maximum valve lift during the charge exchange;
- and
- actuating at least one exhaust valve before the piston reaches bottom dead center during the charge exchange to perform an additional exhaust valve lift in response to the intake pressure being greater than the exhaust pressure.
2 more elements
16-20. (canceled)
Dependencies are inferred from the claim text.