Method for the open-loop control of an electrically controllable valve in a vehicle transmission

US11913506B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Anton Fritzer · Markdorf, DE
• Thilo Schmidt · Meckenbeuren, DE
• Andreas Schmidt · Braunschweig, DE
• Valentine Vincent · Friedrichshafen, DE
• Christoph Köhler · Bodolz, DE
• Jonas Knör · Schönnen, DE
• Michael J. Miller · Pleasant Grove, US
• Mario Hasel · Opfingen, DE
• Jakob Mayer · Kreßbronn, DE
• Christian Hunger · Eriskirch, DE
• Fabian Schöniger · Tettnang, DE

Key dates

• Filing date: Jun 7, 2023
• Grant date: Feb 27, 2024
• Expiry date: Jun 7, 2043

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H61/061
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A vehicle transmission includes a hydraulic circuit and a control unit. The control unit is configured to: obtain (20) a target pressure specification; convert (26) the target pressure specification into a target volume flow rate; determine (42) a valve volume flow rate as a function of the target volume flow rate and as a function of parameters that represent system properties of the hydraulic circuit; determine (46) a pressure drop at a valve due to flow forces as a function of the valve volume flow rate; determine (48) a compensated valve output pressure as a function of the valve volume flow rate and the pressure drop; determine (58) the electric control current as a function of the compensated valve output pressure; and activate a valve with the electric control current.