Method and device for diagnosing an intake tract of an internal combustion engine
AssigneeContinental Automotive GmbH
InventorsThomas Burkhardt, Jürgen Dingl
Life of this patent
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Abstract
An internal combustion engine has an intake tract having a compressor. A verification is performed as to whether at least one predefined activation condition is met. A boost pressure (PUT) downstream of the compressor is sensed or determined. An adaptation characteristic curve or adaptation characteristic map (KF_AD) is adapted as a function of a rotational speed (N) of the internal combustion engine and the boost pressure (PUT) if the at least one actuation condition is met. A gradient is determined that is representative of a gradient of the adaptation characteristic curve or adaptation map (KF_AD). From the determined gradient, conclusions are drawn with respect to a fault in the intake tract of the internal combustion engine.
Claims20
A method for diagnosing an intake tract of an internal combustion engine, which comprises a compressor, the method comprising:
- checking as to whether at least one predetermined activation condition is fulfilled,
- detecting or determining a boost pressure downstream of the compressor,
- adapting an adaptation characteristic curve or an adaptation characteristic map as a function of a rotational speed, of the internal combustion engine and the boost pressure if the at least one activation condition is fulfilled,
- determining a gradient which is representative of the gradient of the adaptation characteristic curve or the adaptation characteristic map, and
- depending on the gradient determined, detecting an error in the intake tract of the internal combustion engine.
A device for diagnosing an intake tract of an internal combustion engine, wherein the internal combustion engine comprises a compressor which is operable
- to check whether at least one predetermined activation condition is fulfilled,
- to detect or determine a boost pressure downstream of the compressor,
- to adapt an adaptation characteristic curve or an adaptation characteristic map as a function of a rotational speed of the internal combustion engine and the boost pressure if the at least one activation condition is fulfilled,
- to determine a gradient which is representative for a gradient of the adaptation characteristic curve or the adaptation characteristic map, and
- to detect an error of the intake tract of the internal combustion engine as a function of the gradient determined.
Dependencies are inferred from the claim text.