Cylinder specific performance parameter computed for an internal combustion engine
First Claim
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1. A method for determining a cylinder specific performance parameter for a cylinder of a multi-cylinder internal combustion engine, comprising the steps of:
- determining a performance parameter representative of engine output across a first group of cylinders based on an engine operating parameter;
determining a cylinder deviation parameter representative of engine output of a single combustion event in the cylinder; and
calculating the cylinder specific performance parameter based on said performance parameter and said cylinder deviation parameter.
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Abstract
A method for estimating a cylinder specific performance parameter for a specific cylinder of an internal combustion engine for each firing attempt, which relies on production sensors commonly equipped onboard production vehicles, is disclosed.
35 Citations
43 Claims
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1. A method for determining a cylinder specific performance parameter for a cylinder of a multi-cylinder internal combustion engine, comprising the steps of:
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determining a performance parameter representative of engine output across a first group of cylinders based on an engine operating parameter;
determining a cylinder deviation parameter representative of engine output of a single combustion event in the cylinder; and
calculating the cylinder specific performance parameter based on said performance parameter and said cylinder deviation parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for estimating a cylinder specific performance parameter for a cylinder of a multi-cylinder internal combustion engine, comprising the steps of:
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determining a rotational speed of the engine over a prior time interval;
determining an engine rotational acceleration deviation associated with a single combustion event in the cylinder based on said rotational speed;
determining a value of a performance parameter representative of engine output across a group of engine cylinders; and
determining the cylinder specific performance parameter based on said engine rotational acceleration deviation and said performance parameter. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A system capable of computing an indicated mean effective pressure for a cylinder of an internal combustion engine, said cylinder being a member of a group of cylinders in the engine, said system comprising:
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a crankshaft position sensor coupled to the engine; and
an electronic control unit operably connected to the engine and said crankshaft position sensor, said unit determining an engine rotational acceleration deviation for a single cylinder based on a signal from said crankshaft position sensor, said unit further determining indicated mean effective pressure for all cylinders of the engine, said unit further determining the cylinder specific indicated mean effective pressure of the cylinder based on said engine rotational acceleration deviation for the cylinder and said indicated mean effective pressure for the engine. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A computer readable storage medium having stored data representing instructions executable by a computer to compute a cylinder specific performance parameter for a cylinder of an internal combustion engine, said cylinder being a member of a group of cylinders in said engine, comprising:
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instructions to determine a value of a measured engine quantity over a prior interval;
instructions to determine a deviation value of said measured engine quantity, said deviation value being associated with a single combustion event in the cylinder;
instructions to determine a performance parameter representative of engine output across the group of cylinders; and
instructions to determine the cylinder specific performance parameter for the cylinder based on said deviation value and said performance parameter of said group of cylinders. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification