Misfire detection apparatus for internal combustion engine based on piston speed
First Claim
1. A method of detecting a misfire in an engine comprising:
- detecting a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of a first piston within a first cylinder;
detecting a second engine speed at a second crankshaft position that corresponds to about a position subsequent to said top dead center compression position; and
determining whether the misfire occurred in said first cylinder based on said first engine speed and said second engine speed.
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Accused Products
Abstract
The present invention generally includes a method of detecting a misfire in an internal combustion engine. The method includes detecting a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of a first piston within a first cylinder and detecting a second engine speed at a second crankshaft position that corresponds to about a position subsequent to the top dead center compression position. The method determines whether the misfire occurred in the first cylinder based on the first engine speed and the second engine speed. The method provides an improved signal to noise ratio for engine misfire detection.
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Citations
28 Claims
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1. A method of detecting a misfire in an engine comprising:
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detecting a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of a first piston within a first cylinder;
detecting a second engine speed at a second crankshaft position that corresponds to about a position subsequent to said top dead center compression position; and
determining whether the misfire occurred in said first cylinder based on said first engine speed and said second engine speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of detecting a misfire in an internal combustion engine comprising:
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detecting a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of a first piston within a first cylinder;
detecting a second engine speed at a second crankshaft position that corresponds to about a top dead center compression position of a second piston within a second cylinder;
detecting a third engine speed at a third crankshaft position that corresponds to about a top dead center compression position of a third piston within a third cylinder; and
determining whether the misfire occurred in said second cylinder based on said first engine speed, said second engine speed and said third engine speed. - View Dependent Claims (13, 14, 15, 16)
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17. A misfire detection system for an internal combustion engine comprising:
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a first cylinder having a first piston coupled to a crankshaft, said piston traveling through a plurality of positions, each of said positions corresponding to respective crankshaft positions; and
a control module that detects a first engine speed at a first crankshaft position that corresponds to a top dead center compression position of said first piston within said first cylinder, that detects a second engine speed at a second crankshaft position, that determines a first change in engine speed based on a difference between said first engine speed and said second engine speed, and that determines whether the misfire occurred in said first cylinder based on said first change in said first engine speed. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A misfire detection system for an internal combustion engine comprising:
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a first cylinder having a first piston connected to a crankshaft, said first piston traveling through a plurality of positions, each of said positions corresponding to respective crankshaft positions;
a second cylinder having a second piston connected to said crankshaft, said second piston traveling through a plurality of positions, each of said positions corresponding to respective crankshaft positions;
a third cylinder having a third piston connected to said crankshaft, said third piston traveling through a plurality of positions, each of said positions corresponding to respective crankshaft positions; and
a control module that detects a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of said first piston within said first cylinder, that detects a second engine speed at a second crankshaft position that corresponds to about a top dead center compression position of said second piston in said second cylinder, that detects a third engine speed at a third crankshaft position that corresponds to about a top dead center compression position of said third piston within said third cylinder and that determines whether a misfire has occurred in said second cylinder based on said first engine speed, said second engine speed and said third engine speed. - View Dependent Claims (25, 26, 27, 28)
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Specification