Misfire detection in engines for on-board-diagnostics
First Claim
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1. A method for detecting a cylinder misfire in an engine, the method comprising:
- monitoring a temperature in the exhaust of the engine, wherein the temperature is monitored at a catalyst, the catalyst coupled to the engine and receiving the exhaust from the engine; and
examining vibration of the engine to identify a misfiring cylinder in the engine in response to the monitored temperature indicating a misfire may have occurred.
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Abstract
Detection of cylinder misfires in engines. In one aspect of the invention, a method for detecting a cylinder misfire in an engine includes monitoring a temperature in the exhaust of the engine. Vibration of the engine is analyzed to identify a misfiring cylinder in the engine if the monitored temperature indicates a misfire may have occurred.
50 Citations
26 Claims
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1. A method for detecting a cylinder misfire in an engine, the method comprising:
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monitoring a temperature in the exhaust of the engine, wherein the temperature is monitored at a catalyst, the catalyst coupled to the engine and receiving the exhaust from the engine; and examining vibration of the engine to identify a misfiring cylinder in the engine in response to the monitored temperature indicating a misfire may have occurred. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for detecting a cylinder misfire in an engine, the system comprising:
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one or more sensors operative to sense a temperature in the exhaust of the engine wherein the sensors sense the temperature at a catalyst, the catalyst coupled to the engine and receiving the exhaust from the engine; an accelerometer coupled to the engine and operative to detect vibration of the engine; and a controller operative to monitor the sensed temperature and to examine the vibration of the engine to identify a misfiring cylinder in the engine, wherein the controller examines the vibration in response to the monitored temperature indicating a misfire may have occurred. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An engine system comprising:
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an engine; one or more sensors operative to sense a temperature at a catalyst, the catalyst coupled to the engine and receiving the exhaust from the engine; an accelerometer coupled to the engine and operative to detect vibration of the engine and provide vibration data; and a controller operative to monitor the sensed temperature and to examine the vibration of the engine to identify a misfiring cylinder in the engine, wherein the controller is operative to examine the vibration in response to the monitored temperature indicating a misfire may have occurred, and wherein the examination includes examining a portion of the vibration data corresponding to an expected combustion event of a cylinder of the engine and comparing the portion to a different portion of the vibration data corresponding to no combustion event of any cylinder of the engine. - View Dependent Claims (20, 21, 22)
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23. A computer readable medium including program instructions to be implemented by a computer and for detecting a cylinder misfire in an engine, the program instructions for:
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monitoring a temperature in the exhaust of the engine, wherein the temperature is monitored at a catalyst, the catalyst coupled to the engine and receiving the exhaust from the engine; and examining vibration of the engine to identify a misfiring cylinder in the engine in response to the monitored temperature indicating a misfire may have occurred. - View Dependent Claims (24, 25, 26)
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Specification