System and method for diagnosing an engine
First Claim
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1. A method for an engine including a crankcase, comprising:
- diagnosing, via an electronic controller, a condition of the engine based on frequency content of a measured crankcase pressure, wherein diagnosing the engine condition includes identifying whether there is degradation of each of a turbocharger and an engine cylinder;
adjusting, via the electronic controller, an engine operating parameter based on the diagnosed condition; and
correlating crankcase pressure information to one or more of a crankshaft position, a camshaft position, or a fuel injection sequence.
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Abstract
Methods and systems are provided for an engine including a crankcase. A condition of the engine may be diagnosed based on frequency content of crankcase pressure. Different types of degradation may be distinguished based on a frequency content of multiple frequencies of the crankcase pressure. Thus, a degraded engine component may be identified in a manner that reduces service induced delay.
40 Citations
20 Claims
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1. A method for an engine including a crankcase, comprising:
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diagnosing, via an electronic controller, a condition of the engine based on frequency content of a measured crankcase pressure, wherein diagnosing the engine condition includes identifying whether there is degradation of each of a turbocharger and an engine cylinder; adjusting, via the electronic controller, an engine operating parameter based on the diagnosed condition; and correlating crankcase pressure information to one or more of a crankshaft position, a camshaft position, or a fuel injection sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for an engine including a crankcase, comprising:
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diagnosing, via an electronic controller, a condition of the engine based on frequency content of a measured crankcase pressure, wherein diagnosing the engine condition includes identifying whether there is degradation of each of a turbocharger and an engine cylinder; adjusting, via the electronic controller, an engine operating parameter based on the diagnosed condition; determining a power stroke frequency component of the frequency content; and selectively disabling fuel injection to one or more cylinders of the engine based at least in part on the power stroke frequency component.
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10. A method for an engine including a crankcase, comprising:
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diagnosing, via an electronic controller, a condition of the engine based on frequency content of a measured crankcase pressure, wherein diagnosing the engine condition includes identifying whether there is degradation of each of a turbocharger and an engine cylinder; adjusting, via the electronic controller, an engine operating parameter based on the diagnosed condition, wherein diagnosing the engine condition includes determining an increased blow-by condition of degraded engine cylinder, and the condition is based at least in part on a power stroke frequency component of the frequency content of the crankcase pressure that exceeds a power stroke frequency component threshold value; varying engine fuel injection to the engine cylinder; and monitoring for a resulting change in the frequency content caused by the fuel injection variation. - View Dependent Claims (11, 12)
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13. A method for a four stroke engine including a crankcase enclosing a crankshaft, comprising:
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distinguishing, via an electronic controller and based on each of an average crankcase pressure and a frequency content of the crankcase pressure, between engine degradation and turbocharger degradation, the frequency content including a half-order component substantially at half a crankshaft revolution, the distinguishing including; comparing the average crankcase pressure to a first average crankcase pressure threshold value; detecting a magnitude of the half-order component of the frequency content that is less than a second magnitude threshold value; and determining degradation of each of a turbocharger or a crankcase evacuation system based on the average crankcase pressure comparison and the detected magnitude; and adjusting an engine operating parameter based on the distinguished degradation. - View Dependent Claims (14, 15, 16)
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17. A method for an engine including a crankcase, comprising:
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diagnosing, via an electronic controller, a condition of the engine based on frequency content of a measured crankcase pressure, wherein diagnosing the engine condition includes identifying whether there is degradation of each of a turbocharger and an engine cylinder, wherein degradation of the engine cylinder is identified based on a magnitude of a power stroke frequency component of the frequency content of the crankcase pressure exceeding a power stroke frequency component threshold value, wherein degradation of the turbocharger is identified based on an average crankcase pressure exceeding an average crankcase pressure threshold value and a magnitude of the power stroke frequency component of the frequency content of the crankcase pressure being below the power stroke frequency component threshold value, and wherein the engine is a four stroke engine and the power stroke frequency component is half of a crankshaft revolution frequency; and adjusting, via the electronic controller, an engine operating parameter based on the diagnosed condition. - View Dependent Claims (18, 19, 20)
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Specification