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US 7,254,476 B2Granted
Method and device for ascertaining valve timing for gas-exchange valves of an internal combustion engine
AssigneeRobert Bosch GmbH
InventorUwe Kassner
Life of this patent
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Abstract
A method for ascertaining valve timing for gas exchange valves of an internal combustion engine in which a combustion chamber pressure characteristic is determined, a state function being calculated from the combustion chamber pressure characteristic and a combustion chamber volume characteristic, and the timing of the gas exchange valves is determined by analyzing the state function.
Claims6
A method for ascertaining valve timing for gas exchange valves of an internal combustion engine, the method comprising:
- ascertaining a combustion chamber pressure characteristic;
- calculating a state function from the combustion chamber pressure characteristic and a combustion chamber volume characteristic;
- determining the timing of the gas exchange valves by analyzing the state function;
- and
- selecting a polytropic exponent as a function of a given operating mode, the polytropic exponent being fixed for the given operating mode.
2 more elements
A device for determining timing for gas exchange valves of an internal combustion engine, comprising:
- an arrangement for ascertaining a combustion chamber pressure characteristic;
- an arrangement for calculating a state function on the basis of the detected combustion chamber pressure characteristic and a combustion chamber volume characteristic;
- an arrangement for determining valve timings on the basis of the state function;
- and
- an arrangement for selecting a polytropic exponent as a function of a given operating mode, the polytropic exponent being fixed for the given operating mode.
2 more elements
Dependencies are inferred from the claim text.