Control valve arrangement for controlling a start clutch of an automatic gearbox

US7736270B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Georg Gierer · Kreßbronn, DE
• Thilo Schmidt · Meckenbeuren, DE

Key dates

• Filing date: Apr 22, 2005
• Grant date: Jun 15, 2010
• Expiry date: Mar 28, 2027

Classification

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

Abstract

A control valve arrangement for controlling a start coupling of an automatic gearbox comprising a clutch control valve (3, 37, 41, 48, 49) for controlling at least one clutch actuating device (4, 40) which, during normal operation of the gearbox, converts a supply pressure input (P_V1, P_V2) into a clutch actuation pressure (P_K, P_K1, P_K2) according to a pre-control pressure or an electric pre-control signal in order to control the clutch actuation device. An activating pressure (P_A) can be supplied to the clutch control valve or directly to the clutch activation device in the event of a discontinuation of the pre-control pressure or pre-control signal according to the engine and gearbox output speed, whereupon the clutch actuation device is maintained in a closed position as long as the above mentioned speed remains above a predetermined limit.