Automatic control device of an infinitely variable transmission gear driven by an internal combustion engine, especially for motorized vehicles

US4368798A · kind A · utility

Assignee

• Zahnradfabrik Friedrichshafen AG · DE

Inventors

• Michael Meyerle · Meckenbeuren, DE
• Friedrich Ehrlinger

Key dates

• Filing date: Aug 22, 1980
• Grant date: Jan 18, 1983
• Expiry date: Aug 22, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0015
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hydrostatic transmission coupled with a gear transmission for operating a motor vehicle driven by an internal combustion engine has its accelerator pedal connected to the throttle valve of the engine and to the servovalve of the stepless hydrostatic transmission via an engine characteristic storage which modulates the accelerator travel signal applied to the servovalve to optimize the fuel consumption. The servovalve also receives input from an electric signal comparator which compares the engine speed with an output signal from the output unit of the hydrostatic transmission or the output shaft of the gear transmission.