Methods and system for diagnosing an engine component based on an engine speed profile during an engine shutdown event
First Claim
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1. A method for an engine, comprising:
- storing an initial engine speed profile in a memory of a controller;
measuring an engine speed drop rate, via an engine speed sensor, during an engine shutdown event;
indicating a change in performance of one of the engine speed sensor or an additional engine component in response to the measured engine speed drop rate deviating from a reference engine speed drop rate by an engine speed drop threshold rate;
adjusting one or more engine operating parameters in response to the indication; and
wherein the reference engine speed drop rate is determined based on the stored engine speed profile and further comprising updating the stored engine speed profile based on the measured engine speed drop rate.
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Abstract
Various methods and systems are provided for diagnosing an engine component based on a measured engine speed during an engine shutdown event. As one embodiment, a method for an engine includes measuring an engine speed drop rate, via an engine speed sensor, during an engine shutdown event; and indicating a change in performance of one of the engine speed sensor or an additional engine component in response to the measured engine speed drop rate deviating from a reference engine speed drop rate by a pre-set or pre-defined threshold rate.
19 Citations
14 Claims
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1. A method for an engine, comprising:
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storing an initial engine speed profile in a memory of a controller; measuring an engine speed drop rate, via an engine speed sensor, during an engine shutdown event; indicating a change in performance of one of the engine speed sensor or an additional engine component in response to the measured engine speed drop rate deviating from a reference engine speed drop rate by an engine speed drop threshold rate; adjusting one or more engine operating parameters in response to the indication; and wherein the reference engine speed drop rate is determined based on the stored engine speed profile and further comprising updating the stored engine speed profile based on the measured engine speed drop rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for an engine, comprising:
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a first crankshaft speed sensor; and a controller operatively coupled to the first crankshaft speed sensor and configured to; determine a first rate of decrease in engine speed output by the first crankshaft speed sensor during an engine shutdown event; indicate a change in performance of the first crankshaft speed sensor in response to the determined first rate of decrease in engine speed differing from a reference rate of decrease in engine speed by a threshold rate, the reference rate based on a model of expected engine speed decay during the engine shutdown event for the engine; adjust operating parameters of the engine in response to the indication; and wherein the controller is further configured to update the model of expected engine speed decay based on the determined first rate of decrease in engine speed during the engine shutdown event and to determine a new reference rate based on the model that is updated. - View Dependent Claims (13, 14)
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Specification