Internal combustion engine and method for controlling a supercharged internal combustion engine
AssigneeSiemens Aktiengesellschaft
InventorsGerhard Eser, Hong Zhang
Life of this patent
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Abstract
The invention relates to n internal combustion engine and method for controlling a supercharged internal combustion engine, wherein a deviation of the actual lambda value from a calculated lambda value is detected. The value for the exhaust back pressure is corrected subject to the detected deviation for the event of a valve overlap, when the gas exchange valves of the burner head are simultaneously open. The corrected value for the exhaust back pressure is used to determine the air volume in the cylinder.
Claims16
A method for determining air volume in a cylinder for controlling a supercharged internal combustion engine, comprising:
- calculating an anticipated lambda value of the exhaust gas of the internal combustion engine where an intake valve and an exhaust valve of a cylinder in the internal combustion engine open simultaneously to create a valve overlap event, the anticipated lambda value calculation using an exhaust gas back-pressure value;
- determining an actual lambda value of the exhaust gas for the internal combustion engine;
- detecting a lambda value deviation between the actual lambda value and the anticipated lambda value;
- correcting the exhaust gas back-pressure value used in the anticipated lambda value calculation based on the lambda value deviation;
- and
- determining a volume of air in the cylinder using the corrected exhaust gas back-pressure value.
A supercharged internal combustion engine, comprising:
- a cylinder having an inlet valve and an exhaust valve, the inlet vale configured to allow inlet of an intake air flow into the cylinder and the exhaust valve configured to allow expulsion of exhaust gas from the cylinder;
- an intake manifold arranged between a throttle valve and the inlet valve;
- a supercharger arranged upstream of the inlet;
- a lambda sensor arranged downstream of the exhaust valve to determine an actual lambda value of the exhaust gas;
- and
- an engine control module that controls a plurality of engine operating parameters wherein the engine control module:
- calculates an anticipated lambda value of the exhaust gas using an exhaust gas back-pressure value when the intake and exhaust valve open simultaneously resulting in a valve overlap condition,
- determines a lambda value deviation between the actual lambda value and the anticipated lambda value,
- correcting an exhaust gas back-pressure value used in the anticipated lambda value pre-calculation based on the lambda value deviation, and determining a volume of air in the cylinder using the corrected exhaust gas back-pressure value.
Dependencies are inferred from the claim text.