Method and device for detecting a leak in an exhaust-gas section of a combustion engine
First Claim
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1. A method for checking an exhaust-gas section of a combustion engine for a leak, the method comprising:
- introducing secondary air into the exhaust-gas section of the combustion engine via a secondary-air valve;
determining a measured value that indicates the magnitude of the relative pressure changes due to the expelling of exhaust gas from the combustion engine upstream from the secondary-air valve; and
detecting the leak in the exhaust-gas section as a function of the measured value.
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Abstract
A method for checking an exhaust-gas section of a combustion engine for a leak, including the following: introducing secondary air into the exhaust-gas section of the combustion engine via a secondary-air valve, determining a measured value that indicates the magnitude of the relative pressure changes due to the expelling of exhaust gas from the combustion engine upstream from the secondary-air valve, and detecting the leak in the exhaust-gas section as a function of the measured value.
10 Citations
12 Claims
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1. A method for checking an exhaust-gas section of a combustion engine for a leak, the method comprising:
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introducing secondary air into the exhaust-gas section of the combustion engine via a secondary-air valve; determining a measured value that indicates the magnitude of the relative pressure changes due to the expelling of exhaust gas from the combustion engine upstream from the secondary-air valve; and detecting the leak in the exhaust-gas section as a function of the measured value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12)
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8. An engine control unit for checking an exhaust-gas section of a combustion engine for a leak, comprising:
an engine control processing arrangement to perform the following; triggering a secondary-air valve so that secondary air is introduced into the exhaust-gas section of the combustion engine, determining a measured value that indicates the magnitude of the relative pressure changes due to the expelling of exhaust gas from the combustion engine upstream from the secondary-air valve, and detecting the leak in the exhaust-gas section as a function of the measured value.
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9. An engine system, comprising:
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an engine control unit having an engine control processing arrangement; an exhaust-gas section; and a secondary-air system by which secondary air is able to be introduced into the exhaust-gas section via the secondary-air valve; wherein the engine control processing arrangement to perform the following; triggering a secondary-air valve so that secondary air is introduced into the exhaust-gas section of the combustion engine, determining a measured value that indicates the magnitude of the relative pressure changes due to the expelling of exhaust gas from the combustion engine upstream from the secondary-air valve, and detecting the leak in the exhaust-gas section as a function of the measured value.
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10. A computer readable medium having a computer program which is executable by a processor arrangement, comprising:
a program code arrangement for performing the following; triggering a secondary-air valve so that secondary air is introduced into the exhaust-gas section of the combustion engine, determining a measured value that indicates the magnitude of the relative pressure changes due to the expelling of exhaust gas from the combustion engine upstream from the secondary-air valve, and detecting the leak in the exhaust-gas section as a function of the measured value.
Specification