Induction diagnostics for skip fire engines
First Claim
1. A method of detecting an induction fault in an internal combustion engine having an intake manifold that supplies air to at least one working chamber of the internal combustion engine, and an intake manifold pressure sensor configured to sense an air pressure within the intake manifold, the method comprising:
- obtaining a first pressure reading indicative of the intake manifold pressure at a time associated with a first working chamber air induction opportunity;
obtaining a second pressure reading indicative of the intake manifold pressure at a time associated with a second working chamber air induction opportunity that follows the first working chamber induction opportunity, the second air induction opportunity being the next air induction opportunity following the first air induction opportunity; and
determining whether an induction fault has occurred in association with the second air induction opportunity based at least in part on the first and second pressure readings.
1 Assignment
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Accused Products
Abstract
A variety of methods, diagnostic modules and other arrangements for detecting air induction faults during operation of an internal combustion engine are described. In some embodiments, the intake manifold pressure is monitored with the intake pressure being read for each induction opportunity. Induction faults may be detected based at least in part on a comparison of the manifold pressure readings for sequential induction opportunities. In some embodiments, an induction fault is identified when the difference between the manifold pressure associated with an induction opportunity and the immediately preceding induction opportunity exceeds an induction fault threshold.
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Citations
23 Claims
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1. A method of detecting an induction fault in an internal combustion engine having an intake manifold that supplies air to at least one working chamber of the internal combustion engine, and an intake manifold pressure sensor configured to sense an air pressure within the intake manifold, the method comprising:
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obtaining a first pressure reading indicative of the intake manifold pressure at a time associated with a first working chamber air induction opportunity; obtaining a second pressure reading indicative of the intake manifold pressure at a time associated with a second working chamber air induction opportunity that follows the first working chamber induction opportunity, the second air induction opportunity being the next air induction opportunity following the first air induction opportunity; and determining whether an induction fault has occurred in association with the second air induction opportunity based at least in part on the first and second pressure readings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An induction fault lookup table embodied in a non-transitory computer readable medium associated with an engine controller for use in identifying air induction faults, the induction fault lookup table comprising:
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a multiplicity of entries that identify induction fault thresholds, and wherein the induction fault lookup table includes at least one index selected from the group consisting of (i) a number of skipped induction opportunities that immediately preceded a current induction opportunity, (ii) an intake manifold pressure ratio, (iii) an operational firing fraction, and (iv) an engine speed. - View Dependent Claims (13, 14, 15, 16)
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17. A diagnostics module configured to detect induction faults that occur during operation of an internal combustion engine that includes an intake manifold that supplies air to at least one working chamber of the internal combustion engine, and an intake manifold pressure sensor configured to sense an air pressure within the intake manifold, the diagnostic module comprising a controller configured to:
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obtain a first pressure reading indicative of the intake manifold pressure at a time associated with a first working chamber induction opportunity that has the potential to draw air from the intake manifold; obtain a second pressure reading indicative of the intake manifold pressure at a time associated with a second working chamber induction opportunity that has the potential to draw air from the intake manifold, the second working chamber induction opportunity being the next working chamber induction opportunity following the first working chamber induction opportunity; and determine whether an induction fault has occurred in association with the second working chamber induction opportunity based at least in part on the first and second pressure readings. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification