Method for operating a parking lock device by means of a hydraulic system

US11073207B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Rainer Novak · Bregenz, AT
• Markus Terwart · Freilassing, DE
• Andreas Roedler · Taufkirchen, DE
• Alexander Hoffmann · Neckargemünd, DE
• Andreas Feiner · Isny im Allgäu, DE
• Tobias Pfleger · Markdorf, DE

Key dates

• Filing date: Mar 20, 2017
• Grant date: Jul 27, 2021
• Expiry date: May 18, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H63/483
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for operating a parking lock device (21) with a hydraulic system (1), the method including, when there is a demand to engage the parking lock device (21) originating from a disengaged operating condition of the parking lock device (21), applying a pilot pressure (p_EDS4) at the parking lock valve (PSV) and applying the main pressure (p_sys) at the parking lock valve (PSV), if necessary, via the positioning valve (POSV). The pilot pressure (p_EDS4) and the main pressure (p_sys) are each guided to defined pressure levels at which the parking lock valve (PSV) is transferrable into the further operating condition range of the parking lock valve (PSV) by the active actuating force against the pilot pressure (p_EDS4) and against the pressure between the parking lock valve (PSV) and the parking lock cylinder (23).