Mercedes-benz Aktiengesellschaft

Daimler Chrysler Ag

Ludger Kortenjann

Bernd Bertsche

Gerhard Wagner

Frank Tietze

G&uuml;nter Indlekofer

Rainer Wust

A gearbox of a gear-changing appliance has a frictional connection whose engagement by a hydraulic fluid actuator causes an associated gearbox transmission ratio to be effective. A control pressure derived from the working pressure of the actuator is used to influence a pressure regulating valve for a supply pressure present at a pressure regulating valve which adjusts the working pressure as required by an electronic control unit.

Shifting device in a variable speed gearbox with pressure regulating valves for working and feed pressure

An arrangement drives an automatic selector appliance of a change-speed gearbox of a motor vehicle into a position for emergency running in the event of a failure of an electronic control unit. A specified forward gear is selected, after the vehicle has come to rest, by manually moving a range selector valve into a P position and back into a D position.

Emergency running driving arrangement for a change-speed gearbox

An arrangement for controlling an automatic selector device of a change-speed gearbox has two selecting connections engageable alternately by selecting actuators operated by pressure medium can be actuated into two non-transient and two transient selector conditions. This alternate engageability is provided by an electronic control unit by way of just one electromagnetic control valve. The arrangement also uses three pressure systems and two multi-way valve arrangements.

Control for a motor vehicle change-speed gearbox automatic selector

An axial piston-type servomotor uses control connections on the working cylinder and corresponding control edges on the working piston, together with selector valve apparatus for controlling the working piston into a central stroke position.

Growing community of inventors

Fellbach, Germany

Ludger Kortenjann