Method for reducing the fuel supply for one engine cylinder
First Claim
1. A method for reducing a fuel supply to a multi-cylinder internal combustion engine having a common injection system for all cylinders, comprising the steps of:
- determining whether a first condition occurs in a first cylinder which prevents reliable combustion of an air/fuel mixture in the first cylinder; and
reducing a first supply of fuel to the first cylinder, upon the occurrence of the first condition, with a reduced supply of fuel being fed to a second cylinder which precedes the first cylinder in an intake cycle sequence.
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Accused Products
Abstract
In a method for reducing the fuel supply for one cylinder of a multi-cylinder internal combustion engine with centralized injection, the procedure is that the cylinder located in the intake cycle sequence in front of the cylinder whose mixture is to be made much leaner, for example because of unreliable combustion, is already supplied with less fuel than is the case when all cylinders are operable. In addition, the intake cycle for the failed cylinder itself is supplied with as little fuel as possible. Using this method, it is possible to set a very lean mixture in the failed cylinder but a mixture having a lambda value close to 1 in the remaining cylinders. This ensures that the motor vehicle in which the internal combustion engine with the failed cylinder is operating can still be reliably operated and, at the same time, there is no risk of overheating of the catalytic converter.
34 Citations
12 Claims
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1. A method for reducing a fuel supply to a multi-cylinder internal combustion engine having a common injection system for all cylinders, comprising the steps of:
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determining whether a first condition occurs in a first cylinder which prevents reliable combustion of an air/fuel mixture in the first cylinder; and reducing a first supply of fuel to the first cylinder, upon the occurrence of the first condition, with a reduced supply of fuel being fed to a second cylinder which precedes the first cylinder in an intake cycle sequence. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating an internal combustion engine having a plurality of cylinders and central fuel injection, comprising the steps of:
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(a) determining whether a first cylinder is operable; and (a) supplying a first amount of fuel to the first cylinder if the first cylinder is operable; and (a) supplying a second amount of fuel to the first cylinder and a third amount of fuel to a second cylinder preceding the first cylinder in an intake stroke sequence, both the second and third amounts of fuel being less than the first amount of fuel if the first cylinder is inoperable. - View Dependent Claims (8, 9, 10, 11)
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12. A method for reducing a fuel supply to a multi-cylinder internal combustion engine having a common injection system for all cylinders and also having tank venting, comprising the steps of:
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determining whether a first condition occurs in a first cylinder which prevents reliable combustion of an air/fuel mixture in the first cylinder; and preventing tank venting and reducing a first supply of fuel to the first cylinder, upon the occurrence of the first condition, with a reduced supply of fuel being fed to a second cylinder which precedes the first cylinder in an intake cycle sequence.
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Specification