Electronic-hydraulic control unit for an automatic transmission for vehicles

US6393943B1 · kind B1 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Stefan Sommer · Ergolding, DE
• Bernhard Fessler · Friedrichshafen, DE
• Holger Bacher · Gettorf, DE
• Klaus Gessler · Friedrichshafen, DE

Key dates

• Filing date: Aug 23, 2000
• Grant date: May 28, 2002
• Expiry date: Aug 23, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/2186
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention is based on an electronic-hydraulic control unit (1) for an automatic transmission of a motor vehicle wherein the control unit (1) has one hydraulic unit (2) with hydraulic valves (4), sensors (6, 7) and pressure regulators (5) and one electronic unit (3) with a microprocessor, memories, sensors and power regulators (9) 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.