Method for operating an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsHolger Jessen, Wolfgang Tiebel
Life of this patent
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Abstract
In a method for operating an internal combustion engine having multiple cylinders, a cylinder to be checked is diagnosed for an injection quantity error. During a normal operation, a first air/fuel ratio is predefined for the multiple cylinders, and a first uneven running is ascertained. During an adjustment operation, a second air/fuel ratio for the cylinder to be checked is predefined during a number of working cycles. During the adjustment operation, a second uneven running is ascertained. The injection quantity error is ascertained for the cylinder to be checked as a function of the first uneven running and the second uneven running.
Claims15
A method for diagnosing an injection quantity error of at least one selected cylinder in an internal combustion engine having multiple cylinders, comprising:
- predefining a respective first air/fuel ratio for each of the multiple cylinders during a normal operation;
- ascertaining a first uneven running during the normal operation;
- predefining, during an adjustment operation, a second air/fuel ratio for the selected cylinder for a predefined number of working cycles;
- ascertaining a second uneven running during the adjustment operation;
- and
- ascertaining the injection quantity error for the selected cylinder as a function of the first uneven running and the second uneven running.
A non-transitory computer-readable data storage medium storing a computer program having program codes which, when executed on a computer, performs a method for diagnosing an injection quantity error of at least one selected cylinder in an internal combustion engine having multiple cylinders, the method comprising;
- predefining a respective first air/fuel ratio for each of the multiple cylinders during a normal operation;
- ascertaining a first uneven running during the normal operation;
- predefining, during an adjustment operation, a second air/fuel ratio for the selected cylinder for a predefined number of working cycles;
- ascertaining a second uneven running during the adjustment operation;
- and
- ascertaining the injection quantity error for the selected cylinder as a function of the first uneven running and the second uneven running.
Control unit for diagnosing an injection quantity error of at least one selected cylinder in an internal combustion engine having multiple cylinders, comprising:
- means for predefining a respective first air/fuel ratio for each of the multiple cylinders during a normal operation;
- means for ascertaining a first uneven running during the normal operation;
- means for predefining, during an adjustment operation, a second air/fuel ratio for the selected cylinder for a predefined number of working cycles;
- means for ascertaining a second uneven running during the adjustment operation;
- and
- means for ascertaining the injection quantity error for the selected cylinder as a function of the first uneven running and the second uneven running.
Dependencies are inferred from the claim text.