Method for the emergency actuation of an automated double clutch transmission of a motor vehicle

US8086381B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Anton Fritzer · Markdorf, DE
• Markus Herrmann · Scheidegg, DE
• Thilo Schmidt · Meckenbeuren, DE
• Christian Popp · Kreßbronn, DE
• Georg Gierer · Kreßbronn, DE

Key dates

• Filing date: Nov 5, 2007
• Grant date: Dec 27, 2011
• Expiry date: Jan 16, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S477/906
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for emergency actuation of an automated dual-clutch transmission of a vehicle with electrohydraulic control via a transmission control device. The method includes disengaging one clutch of the dual-clutch transmission, in order to realize emergency operation of the transmission and applying pressure on the other clutch after an error signal is transmitted indicating a malfunction of the transmission and/or the transmission control device. In order to keep the complexity of the hardware of the hydraulic system low, both clutches are disengaged, when an error signal occurs, and adjusted to a safe initial state, and an actuating pressure is only re-applied to one of the two clutches after the initial state is reached. In addition to the already existing elements of the hydraulic system, only one device or software is required which detects and selects the clutch that is more advantageous for continued driving operation.