Engine Control with Valve Operation Monitoring Using Camshaft Position Sensing
First Claim
1. A method for controlling an internal combustion engine operable in a reduced displacement mode, the method comprising:
- detecting operation of at least one gas exchange valve inconsistent with an activation state of an associated cylinder during reduced displacement mode operation in response to detected camshaft position relative to a reference camshaft position.
1 Assignment
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Accused Products
Abstract
A system or method for controlling a multiple cylinder internal combustion engine operable in a reduced displacement mode with at least one valve or cylinder selectively deactivated include monitoring valve operation by analyzing camshaft position to detect valve operation inconsistent with a current cylinder state (activated or deactivated) and controlling the engine in response to detecting the inconsistent operation. The camshaft position may be used to produce a surrogate signal indicative of intake/exhaust valve lift generated using camshaft sensor tooth deviation relative to an expected or reference tooth position for a corresponding crankshaft position and compared to a corresponding threshold. The surrogate signal indicative of valve lift may also be generated by pattern matching or correlation of one or more reference tooth position patterns to a measured or inferred tooth position pattern.
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Citations
17 Claims
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1. A method for controlling an internal combustion engine operable in a reduced displacement mode, the method comprising:
detecting operation of at least one gas exchange valve inconsistent with an activation state of an associated cylinder during reduced displacement mode operation in response to detected camshaft position relative to a reference camshaft position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11)
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8. A method for monitoring operation of selectively deactivated valves of an engine by comparing detected camshaft position to a corresponding reference camshaft position.
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12. An engine having a selectively deactivated gas exchange valve operable by a camshaft, and a plurality of pistons coupled to a crankshaft, comprising:
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a camshaft position sensor; a crankshaft position sensor; and a controller in communication with the camshaft and crankshaft position sensors, the controller controlling the engine in response to changes of camshaft position relative to crankshaft position indicative of gas exchange valve operation inconsistent with a cylinder activation state. - View Dependent Claims (13, 14, 15, 16)
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17-20. -20. (canceled)
Specification