Method for determination of characteristics of a transmission
AssigneeZF Friedrichshafen AG
InventorsOtto Lutz, Markus Eisele, Harry Nolzen, Torsten Buchner
Life of this patent
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Abstract
A method for determining characteristic parameter values within a transmission that includes, for example, hydraulically-operated shifting elements, hydro-dynamic brakes, and hydro-dynamic torque converters. Slip regulation is used to determine the actual slip at a transmission element, whose characteristic parameter values are to be determined, before engagement. This element to be adapted is activated by means of pressure application, and thus a specified slip is set that is clearly different from the actual slip at lower torques. The applied pressure or flow may be determined from the set slip, and occurrence of a set slip allows the occurring pressures to be determined.
Claims6
A method for determining a characteristic parameter value within a transmission having a hydraulically-operated transmission element comprising the steps of disengaging the transmission element;
- gradually reengaging the transmission element, while measuring slip, and determining an engagement state of the transmission element corresponding to a predetermined slip, different than a slip during a disengaged state.
Dependencies are inferred from the claim text.