Method and control unit for diagnosing a valve lift...

Details Method and control unit for diagnosing a valve lift... Method and control unit for diagnosing a valve lift...

2007-08-23

2008-12-16

Vo, Hieu T (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S090160

Reexamination Certificate

active

07467042

ABSTRACT:
A method assesses the functional capability of a gas exchange valve lift adjuster of an internal combustion engine as a function of a measure of rotational oscillation amplitudes of a camshaft. The measure of the rotational oscillation amplitudes is formed repeatedly. In a situation in which the gas exchange valve lift adjuster is to change the valve lift, it is checked whether a change in the measure of the rotational oscillation amplitudes occurs. The gas exchange valve lift adjuster is assessed as being functional if a measure for the change is greater than a predetermined threshold value. A control unit is programmed to perform such steps.

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