Method and computer program for identifying a fault in an engine
First Claim
1. A method for identifying a fault associated with an individual cylinder of a multicylinder combustion engine, comprising the steps of:
- supplying a fuel supply to all of the cylinders of the engine and accelerating the combustion engine to a first engine speed (L1);
when the first engine speed (L1) is reached, interrupting the fuel supply to all cylinders except the individual cylinder, while supplying the individual cylinder with a predetermined amount of fuel supply; and
counting the time it takes for the speed of the combustion engine to decrease from either the first engine speed (L1) or a second engine speed (L2), which is lower than the first engine speed (L1), down to a third engine speed (L3).
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Accused Products
Abstract
A method for identifying a fault associated with an individual cylinder of a multicylinder combustion engine, comprising the steps of: accelerating the combustion engine to a first engine speed (L1); interrupting the fuel supply to all cylinders except the individual cylinder, which receives a predetermined amount of fuel supply, when the first engine speed is reached; and counting the time it takes for the speed of the combustion engine to decrease from either the first engine speed or a second engine speed (L2), which is lower than the first engine speed, down to a third engine speed (L3). A computer, a computer program and a computer program product which use the method.
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Citations
26 Claims
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1. A method for identifying a fault associated with an individual cylinder of a multicylinder combustion engine,
comprising the steps of: -
supplying a fuel supply to all of the cylinders of the engine and accelerating the combustion engine to a first engine speed (L1);
when the first engine speed (L1) is reached, interrupting the fuel supply to all cylinders except the individual cylinder, while supplying the individual cylinder with a predetermined amount of fuel supply; and
counting the time it takes for the speed of the combustion engine to decrease from either the first engine speed (L1) or a second engine speed (L2), which is lower than the first engine speed (L1), down to a third engine speed (L3). - View Dependent Claims (2, 3, 4, 5, 6)
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7-12. -12. (canceled)
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13. A method for identifying a fault associated with an individual cylinder of a multicylinder combustion engine,
comprising the steps of: -
supplying a fuel supply to all of the cylinders of the engine and accelerating the combustion engine to a first engine speed (L1);
when the first engine speed (L1) is reached, interrupting the fuel supply to all cylinders except the individual cylinder, while supplying the individual cylinder with a predetermined amount of fuel supply wherein the engine speed decreases to a second engine speed; and
counting the time it takes for the speed of the combustion engine to decrease from an engine speed above the second engine speed, down to the second engine speed.
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14. A software application operable on at least one of an engine control unit and a computer connected to the engine control unit, wherein the software application identifies a fault associated with an individual cylinder of a multicylinder combustion engine and comprises:
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first program code that instructs the engine control unit to cause a fuel supply to all cylinders in the multicylinder combustion engine to accelerate the combustion engine to a first engine speed;
second program code that instructs the engine control unit after the first engine speed is reached to cause an interruption of fuel supply to all cylinders in the multicylinder engine except the individual cylinder, wherein the engine speed decreases to a second engine speed as a function of the fuel supply being interrupted and the software application is operable to identify the fault associated with the individual cylinder based on a determinable time counted while the speed of the engine decreases to the second engine speed. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A computing device that identifies a fault associated with an individual cylinder of a multicylinder combustion engine and comprises:
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a memory which stores a software application that comprises;
first program code that instruct an engine control unit to supply fuel to all cylinders in the multicylinder combustion engine and to accelerate the combustion engine to a first engine speed;
second program code that instruct the engine control unit after the first engine speed is reached to interrupt supplying fuel to all cylinders in the multicylinder engine except the individual cylinder, wherein the engine speed decreases to a second engine speed as a function of the fuel supply being interrupted and the computing device is operable to identify the fault associated with the individual cylinder based on a determinable time counted while the speed of the engine decreases to the second engine speed. - View Dependent Claims (23, 24, 25, 26)
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Specification