METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE
First Claim
1. A method for operating an internal combustion engine, the method comprising the steps of:
- measuring a plurality of values of pressure in a combustion chamber of the internal combustion engine during an engine cycle and a corresponding value of crankshaft angular position for each of plurality of values of pressure;
selecting a group of values from the plurality of values of pressure and the corresponding value of crankshaft angular position for each value of the group of values from the plurality of values of pressure;
using the corresponding values of crankshaft angular position to calculate a corresponding inner volume value of the combustion chamber for each of the group of values from the plurality of values of pressure;
calculating, for each of the group of values from the plurality of values of pressure and the corresponding inner volume value, a value of a polytrophic constant according to a relationship C=pVk wherein C is the polytrophic constant, p is a value of pressure, V is a corresponding inner volume value, and k is a polytrophic index;
calculating a root mean square deviation of the values of the polytrophic constant; and
identifying that a noise has affected the plurality of values of pressure if root mean square deviations exceed a threshold value thereof.
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Accused Products
Abstract
A method for operating an internal combustion engine includes measuring pressure values in a combustion chamber during an engine cycle and a corresponding value of crankshaft angular position for each pressure value and selecting values from the pressure values and the corresponding value of crankshaft angular position for each selected value. The corresponding values of the crankshaft angular position are used to calculate a corresponding inner volume value of the combustion chamber for each of the selected pressure values. For each of the selected pressure values and the corresponding inner volume value, a polytrophic constant is calculated according to C=pVk, C being the polytrophic constant, p the pressure value, V the inner volume value, and k the polytrophic index. A root mean square deviation (RMSD) of the polytrophic constant values is calculated and that a noise has affected the pressure values is identified if the RMSDs exceed a threshold value thereof.
10 Citations
13 Claims
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1. A method for operating an internal combustion engine, the method comprising the steps of:
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measuring a plurality of values of pressure in a combustion chamber of the internal combustion engine during an engine cycle and a corresponding value of crankshaft angular position for each of plurality of values of pressure; selecting a group of values from the plurality of values of pressure and the corresponding value of crankshaft angular position for each value of the group of values from the plurality of values of pressure; using the corresponding values of crankshaft angular position to calculate a corresponding inner volume value of the combustion chamber for each of the group of values from the plurality of values of pressure; calculating, for each of the group of values from the plurality of values of pressure and the corresponding inner volume value, a value of a polytrophic constant according to a relationship C=pVk wherein C is the polytrophic constant, p is a value of pressure, V is a corresponding inner volume value, and k is a polytrophic index; calculating a root mean square deviation of the values of the polytrophic constant; and identifying that a noise has affected the plurality of values of pressure if root mean square deviations exceed a threshold value thereof. - View Dependent Claims (2, 3, 4)
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5. An internal combustion engine comprising a combustion chamber defined by a piston reciprocating within a cylinder and coupled to rotate a crankshaft, a combustion pressure sensor within the combustion chamber and a crank position sensor, the internal combustion engine also comprising an electronic control unit in communication with the combustion pressure sensor and the crank position sensor, the electronic control unit configured for:
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measuring a plurality of values of pressure in the combustion chamber during an engine cycle and a corresponding value of crankshaft angular position for each of the plurality of values of pressure; selecting a group of values from the plurality of values of pressure and the corresponding value of crankshaft angular position for each value of the group of values from the plurality of values of pressure; using the corresponding values of crankshaft angular position to calculate a corresponding inner volume value of the combustion chamber for each of the group of values from the plurality of values of pressure; calculating, for each of the group of values from the plurality of values of pressure and the corresponding inner volume value, a value of a polytrophic constant according to a relationship C=pVk wherein C is the polytrophic constant, p is a value of pressure, V is a corresponding inner volume value, and k is a polytrophic index; calculating a root mean square deviation of the values of the polytrophic constant; and identifying that a noise has affected the plurality of values of pressure if root mean square deviations exceed a threshold value thereof. - View Dependent Claims (6, 7, 8, 9)
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10. An automotive system having an internal combustion engine comprising a combustion chamber defined by a piston reciprocating within a cylinder and coupled to rotate a crankshaft, a combustion pressure sensor within the combustion chamber and a crank position sensor, the automotive system also comprising an electronic control unit in communication with the combustion pressure sensor and the crank position sensor, the electronic control unit configured for:
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measuring a plurality of values of pressure in the combustion chamber during an engine cycle and a corresponding value of crankshaft angular position for each of plurality of values of pressure; selecting a group of values from the plurality of values of pressure and the corresponding value of crankshaft angular position for each value of the group of values from the plurality of values of pressure; using the corresponding values of crankshaft angular position to calculate a corresponding inner volume value of the combustion chamber for each of the group of values from the plurality of values of pressure; calculating, for each of the group of values from the plurality of values of pressure and the corresponding inner volume value, a value of a polytrophic constant according to a relationship C=pVk wherein C is the polytrophic constant, p is a value of pressure, V is a corresponding inner volume value, and k is a polytrophic index; calculating a root mean square deviation of the values of the polytrophic constant; and identifying that a noise has affected the plurality of values of pressure if root mean square deviations exceed a threshold value thereof. - View Dependent Claims (11, 12, 13)
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Specification