Methods and Apparatus for Engine Analysis Using Internal Electrical Signals
First Claim
1. A method of analyzing an engine for misfire activity, comprising:
- receiving an electrical signal associated with a plurality of cycles of the engine;
identifying energy spikes in the electrical signal associated with cylinder firings in the engine;
generating engine speed estimates based on spacing between the energy spikes; and
analyzing anomalies in the engine speed estimates to identify misfire activity in the engine.
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Accused Products
Abstract
A method of analyzing an engine for misfire activity includes receiving an electrical signal associated with a plurality of cycles of the engine, identifying energy spikes in the electrical signal associated with cylinder firings in the engine, generating engine speed estimates based on spacing between the energy spikes, and analyzing anomalies in the engine speed estimates to identify misfire activity in the engine. Also described is a method of analyzing an engine for misfire activity including receiving an electrical signal associated with the engine, detecting AC ripple in the electrical signal, generating engine speed estimates in response to the detected AC ripple, and analyzing anomalies in the engine speed estimates to identify misfire activity in the engine.
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Citations
24 Claims
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1. A method of analyzing an engine for misfire activity, comprising:
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receiving an electrical signal associated with a plurality of cycles of the engine; identifying energy spikes in the electrical signal associated with cylinder firings in the engine; generating engine speed estimates based on spacing between the energy spikes; and analyzing anomalies in the engine speed estimates to identify misfire activity in the engine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of analyzing an engine for misfire activity, comprising:
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receiving an electrical signal associated with a plurality of cycles of the engine; identifying components of the electrical signal associated with alternator poles in the engine; generating engine speed estimates based on timing of the alternator poles; and analyzing anomalies in the engine speed estimates to identify misfire activity in the engine. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of analyzing an engine for misfire activity, comprising:
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receiving an electrical signal associated with the engine; detecting AC ripple in the electrical signal; generating engine speed estimates in response to the detected AC ripple; and analyzing anomalies in the engine speed estimates to identify misfire activity in the engine. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification