Combustion control based on a signal from an engine vibration sensor
First Claim
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1. An internal combustion engine, comprising:
- an accelerometer affixed to the engine;
an engine rotation sensor proximate the engine; and
an electronic control unit electronically coupled to the engine and said accelerometer, said electronic control unit adjusting engine parameters based on signals from said accelerometer and said engine rotation sensor, said signals being used to estimate combustion phasing, wherein said engine parameters are at least one of injection timing and EGR rate, the engine having an EGR system which comprises a duct connecting an engine intake with an engine exhaust via an EGR valve, the engine also having one fuel injector per engine cylinder.
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Abstract
Feedback control of an internal combustion engine is performed based on a signal from a vibration sensor and a crankshaft angle sensor. An energy factor can be computed based on these sensor signals. A vector of energy factor can be computed as a function of crank angle degree over a particular window of engine rotation of interest. Based on the energy factor vector, combustion phasing can be estimated.
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Citations
33 Claims
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1. An internal combustion engine, comprising:
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an accelerometer affixed to the engine; an engine rotation sensor proximate the engine; and an electronic control unit electronically coupled to the engine and said accelerometer, said electronic control unit adjusting engine parameters based on signals from said accelerometer and said engine rotation sensor, said signals being used to estimate combustion phasing, wherein said engine parameters are at least one of injection timing and EGR rate, the engine having an EGR system which comprises a duct connecting an engine intake with an engine exhaust via an EGR valve, the engine also having one fuel injector per engine cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling an internal combustion engine, comprising:
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estimating combustion phase based on a signal from a vibration sensor coupled to the engine, said sensor detecting engine vibrations; and adjusting an engine parameter based on said estimated combustion phase. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for controlling an internal combustion engine, comprising:
estimating combustion phase based on an energy factor, said energy factor being based on the absolute value of the power of one, two, three, or four of a signal from a vibration sensor coupled to the engine, said sensor used for detecting engine vibrations during a portion of engine rotation which corresponds roughly when combustion is occurring in one of the engine'"'"'s cylinders. - View Dependent Claims (29, 30, 31, 32, 33)
Specification