Zf Friedrichshafen Ag

Zf Batavia L.l.c.

Klaus Gessler

Stefan Sommer

Bernd Fessler

Holger Bacher

Hubert K&ouml;nig

Bernhard Fessler

The invention is based on an electronic-hydraulic control unit ( ) for an automatic transmission of a motor vehicle wherein the control unit ( ) has one hydraulic unit ( ) with hydraulic valves ( ), sensors ( ) and pressure regulators ( ) and one electronic unit ( ) with a microprocessor, memories, sensors and power regulators ( ) which form a functional unit. To reduce the tolerances of the control unit, it is proposed that the pressure tolerances appearing in the operating range be detected by verifying characteristic lines and from the divergences relative to a set characteristic line, plotting and storing in a memory a corresponding characteristic line correction.

Electronic-hydraulic control unit for an automatic transmission for vehicles

A system for control of a CVT driven by a drive unit has an electromagnetically controlled pressure-control valve which actuates both a main pressure valve and a secondary valve for the secondary pulley wherein geometry and spring tension of a main pressure valve and the secondary valve provide different characteristic lines.

Hydraulic control system for a CVT

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Friedrichshafen, Germany

Klaus Gessler