Method for detecting misfires of an internal combustion engine and device for carrying out the method
First Claim
1. A method for detecting combustion misfires in an internal combustion engine, in which a lambda signal made available by at least one lambda sensor is evaluated, the method comprising:
- providing a broadband lambda sensor as the lambda sensor;
comparing the lambda signal made available by the broadband lambda sensor to a lambda signal threshold value;
specifying the lambda signal threshold value at an air ratio lambda greater than 1 in a range of lean combustion; and
making available a warning signal in response to an exceeding of the lambda signal threshold value in a direction of lean combustion, wherein the warning signal is made available if an enrichment limit of a lambda controller is increased, and if, thereupon, the lambda signal returns to an admissible range.
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Abstract
A method for detecting combustion misfires of an internal combustion engine and a device for carrying out the method, in which an evaluation of a lambda signal made available by at least one broadband lambda sensor is provided. The lambda signal is compared to a lambda signal threshold value. A warning signal is made available in response to the exceeding of a threshold in the direction of lean combustion. The procedure especially makes possible the detection of continual misfires which occur, for example, in response to an error in the air supply to the internal combustion engine and/or because of a lack of fuel. The procedure makes possible the detection of dangerous situations for at least one exhaust gas treatment device that is present, which may be removed by introducing protective measures, error warnings and error memory entries.
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Citations
12 Claims
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1. A method for detecting combustion misfires in an internal combustion engine, in which a lambda signal made available by at least one lambda sensor is evaluated, the method comprising:
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providing a broadband lambda sensor as the lambda sensor; comparing the lambda signal made available by the broadband lambda sensor to a lambda signal threshold value; specifying the lambda signal threshold value at an air ratio lambda greater than 1 in a range of lean combustion; and making available a warning signal in response to an exceeding of the lambda signal threshold value in a direction of lean combustion, wherein the warning signal is made available if an enrichment limit of a lambda controller is increased, and if, thereupon, the lambda signal returns to an admissible range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for operating an internal combustion engine comprising:
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at least one control unit for detecting combustion misfires in the engine, in which a lambda signal made available by at least one broadband lambda sensor is evaluated, the at least one control unit being adapted to perform the following; comparing the lambda signal made available by the broadband lambda sensor to a lambda signal threshold value; specifying the lambda signal threshold value at an air ratio lambda greater than 1 in a range of lean combustion; and making available a warning signal in response to an exceeding of the lambda signal threshold value in a direction of lean combustion, wherein the warning signal is made available if an enrichment limit of a lambda controller is increased, and if, thereupon, the lambda signal returns to an admissible range. - View Dependent Claims (12)
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Specification