Method for operating an internal combustion engine, and associated internal combustion engine
AssigneeDaimler AG
InventorsWolfram Schmid, Siegfried Sumser
Life of this patent
Estimating the term…
Abstract
In a method for operating an internal combustion engine including inlet valves with variably adjustable opening curves, during part-load operation, the closing time of the inlet valves and the fuel injection time are controlled as a function of the cylinder internal temperature so as to maintain the cylinder internal temperature relatively low in a controllable manner for reducing NOx emissions.
Claims18
A method for operating an internal combustion engine having cylinders (29) with inlet and outlet valves (23) arranged at the cylinders (29) of the internal combustion engine (1), said intake valves (23) having an opening curve (26) which is variably adjustable as a function of state and operating variables of the internal combustion engine (1), said method comprising the steps of:
- controlling during part-load operation of the internal combustion engine (1), the closing time of the inlet valves and the fuel injection time as a function of the cylinder internal temperature (Tcyl).
An internal combustion engine having cylinders (29) with inlet and outlet valves (23) arranged at the cylinders (29) of the internal combustion engine (1) and an intake tract (12) for supplying combustion air to the cylinders (29) and an exhaust tract (10, 11) for the discharge of exhaust gas from the cylinders (29), said intake valves (23) having an opening curve (26) which is variably adjustable as a function of state and operating variables of the internal combustion engine (1), said internal combustion engine including a closed-loop and open-loop control unit (25) for variably controlling, during part-load operation of the internal combustion engine (1), the opening of the inlet valves by actuating signals providing for a closing time of the inlet valves and controlling the time of fuel injection into the cylinders (29) as a function of the cylinder internal temperature (Tcyl).
Dependencies are inferred from the claim text.