Engine control strategy
First Claim
1. A method of distinguishing between two loads being driven by an engine, comprising the steps of:
- determining a first engine speed and a second engine speed at defined intervals;
determining if the second engine speed fits an expected pattern of engine speeds relative to the first engine speed; and
counting either the number of incidents where the second engine speed does not fit the expected pattern, or the number of incidents where the second engine speed does fit the expected pattern, or some combination of these two, wherein the defined interval is one engine revolution and wherein the time or speed of each engine revolution is compared to the time or speed for the immediately prior engine revolution and the expected pattern includes alternating faster and slower revolutions.
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Accused Products
Abstract
At least some implementations of a method of distinguishing between two loads being driven by an engine, includes the steps of determining engine speed at defined intervals, comparing a second engine speed against a previously determined first engine speed, determining if the second engine speed fits an expected pattern of engine speeds, and counting either the number of incidents where the second engine speed does not fit the expected pattern, or the number of incidents where the second engine speed does fit the expected pattern, or some combination of these two. A method of determining if an engine is operating at least near a lean limit of its air to fuel ratio is also disclosed.
17 Citations
10 Claims
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1. A method of distinguishing between two loads being driven by an engine, comprising the steps of:
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determining a first engine speed and a second engine speed at defined intervals; determining if the second engine speed fits an expected pattern of engine speeds relative to the first engine speed; and counting either the number of incidents where the second engine speed does not fit the expected pattern, or the number of incidents where the second engine speed does fit the expected pattern, or some combination of these two, wherein the defined interval is one engine revolution and wherein the time or speed of each engine revolution is compared to the time or speed for the immediately prior engine revolution and the expected pattern includes alternating faster and slower revolutions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of distinguishing between two loads being driven by an engine, comprising the steps of:
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determining a first engine speed for a first engine revolution; determining a second engine speed for a second engine revolution immediately following the first engine revolution; determining if the first engine speed and second engine speed fit an expected pattern of engine speeds; counting, over a predetermined number of engine revolutions, either the number of incidents where the second engine speed does not fit the expected pattern, or the number of incidents where the second engine speed does fit the expected pattern, or some combination of these two. - View Dependent Claims (9, 10)
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Specification