DETERMINATION OF ENGINE PARAMETER BASED ON DETERMINING A METRIC OVER THREE OR MORE CYLINDER COMBUSTION CYCLES
First Claim
1. A method for determining an engine parameter of an engine of a motor vehicle based a plurality of rotational speeds of a crankshaft, the method comprising:
- determining a first leading estimated crankshaft rotational speed at a first leading crankshaft position in a leading cylinder combustion cycle;
determining a second leading estimated crankshaft rotational speed at a second leading crankshaft position in the leading cylinder combustion cycle;
determining a first middle estimated crankshaft rotational speed at a first middle crankshaft position in a middle cylinder combustion cycle;
determining a second middle estimated crankshaft rotational speed at a second middle crankshaft position in the middle cylinder combustion cycle;
determining a first following estimated crankshaft rotational speed at a first following crankshaft position in a following cylinder combustion cycle;
determining a second following estimated crankshaft rotational speed at a second following crankshaft position in the following cylinder combustion cycle;
determining an calculated metric based on at least the first and second leading estimated crankshaft rotational speeds, the first and second middle estimated crankshaft rotational speeds, and the first and second following estimated crankshaft rotational speeds; and
determining the engine parameter based on the calculated metric.
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Accused Products
Abstract
A method, system, and engine are configured to determine a parameter based on rotational speeds of a crankshaft, over at least three cylinder combustion cycles. The method, system, and engine determine two or more estimated crankshaft rotational speeds at two or more positions in a leading cylinder combustion cycle, two or more estimated crankshaft rotational speeds at two or more positions in a middle cylinder combustion cycle, and two or more estimated crankshaft rotational speeds at two or more positions in a following cylinder combustion cycle. The method, system, and engine are configured to determine a calculated metric based on each of the determined leading estimated crankshaft rotational speeds, the determined middle estimated crankshaft rotational speeds, and the determined following estimated crankshaft rotational speeds. An engine parameter, such as misfire, is then determined based on the calculated metric.
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Citations
20 Claims
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1. A method for determining an engine parameter of an engine of a motor vehicle based a plurality of rotational speeds of a crankshaft, the method comprising:
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determining a first leading estimated crankshaft rotational speed at a first leading crankshaft position in a leading cylinder combustion cycle; determining a second leading estimated crankshaft rotational speed at a second leading crankshaft position in the leading cylinder combustion cycle; determining a first middle estimated crankshaft rotational speed at a first middle crankshaft position in a middle cylinder combustion cycle; determining a second middle estimated crankshaft rotational speed at a second middle crankshaft position in the middle cylinder combustion cycle; determining a first following estimated crankshaft rotational speed at a first following crankshaft position in a following cylinder combustion cycle; determining a second following estimated crankshaft rotational speed at a second following crankshaft position in the following cylinder combustion cycle; determining an calculated metric based on at least the first and second leading estimated crankshaft rotational speeds, the first and second middle estimated crankshaft rotational speeds, and the first and second following estimated crankshaft rotational speeds; and determining the engine parameter based on the calculated metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining an engine parameter of an engine of a motor vehicle based a plurality of rotational speeds of a crankshaft, the system comprising:
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a crankshaft speed determination module configured to determine a first leading estimated crankshaft rotational speed at a first leading crankshaft position in a leading cylinder combustion cycle, a second leading estimated crankshaft rotational speed at a second leading crankshaft position in the leading cylinder combustion cycle, a first middle estimated crankshaft rotational speed at a first middle crankshaft position in a middle cylinder combustion cycle, a second middle estimated crankshaft rotational speed at a second middle crankshaft position in the middle cylinder combustion cycle, a first following estimated crankshaft rotational speed at a first following crankshaft position in a following cylinder combustion cycle, and a second following estimated crankshaft rotational speed at a second following crankshaft position in the following cylinder combustion cycle; a metric module configured to calculate a metric based on at least the first leading estimated crankshaft rotational speed, the second leading estimated crankshaft rotational speed, the first middle estimated crankshaft rotational speed, the second middle estimated crankshaft rotational speed, the first following estimated crankshaft rotational speed, and the second following estimated crankshaft rotational speed; and an engine parameter determination module configured to determine the engine parameter based on the calculated metric. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An internal combustion engine for powering a motor vehicle, the internal combustion engine comprising:
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a first cylinder defining a first bore; a first piston moveable within the first bore; a second cylinder defining a second bore; a second piston moveable within the second bore; a third cylinder defining a third bore; a third piston moveable within the third bore; a crankshaft configured to move the first piston within the first bore of the first cylinder in a leading cylinder combustion cycle, the crankshaft being configured to move the second piston within the second bore of the second cylinder in a middle cylinder combustion cycle, and the crankshaft being configured to move the third piston within the third bore of the third cylinder in a following cylinder combustion cycle; an engine control system configured to rotate the crankshaft to move the first piston within the first bore through the leading cylinder combustion cycle, the leading cylinder combustion cycle comprising a leading cylinder intake stroke, a compression stroke of the first piston, an expansion stroke of the first piston, and a leading cylinder exhaust stroke, the engine control system being configured to move the second piston within the second bore through the middle cylinder combustion cycle, the middle cylinder combustion cycle comprising a middle cylinder intake stroke, a compression stroke of the second piston, an expansion stroke of the second piston, and a middle cylinder exhaust stroke, the engine control system being configured to move the third piston within the third bore through the following cylinder combustion cycle, the following cylinder combustion cycle comprising a following cylinder intake stroke, a compression stroke of the third piston, an expansion stroke of the third piston, and a following cylinder exhaust stroke, wherein the engine control system is configured to determine; a first leading crankshaft rotational speed at a first leading crankshaft position in the leading cylinder combustion cycle; a second leading crankshaft rotational speed at a second leading crankshaft position in the leading cylinder combustion cycle; a first middle crankshaft rotational speed at a first middle crankshaft position in the middle cylinder combustion cycle; a second middle crankshaft rotational speed at a second middle crankshaft position in the middle cylinder combustion cycle; a first following crankshaft rotational speed at a first following crankshaft position in the following cylinder combustion cycle; a second following crankshaft rotational speed at a second following crankshaft position in the following cylinder combustion cycle; and a calculated metric based on at least the first and second leading estimated crankshaft rotational speeds, the first and second middle estimated crankshaft rotational speeds, and the first and second following estimated crankshaft rotational speeds, the engine control system being configured to determine the engine parameter based on the calculated metric. - View Dependent Claims (18, 19, 20)
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Specification