Zf Friedrichshafen Ag

Zahnradfabrik Friedrichshafen, Ag.

Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Robert Boschgmbh

Zf Lenksysteme Gmbh

Wolfgang Runge

Gerhard Eschrich

Karlheinz Mayr

Hubert Remmlinger

Wolfgang Danz

Udo Gillich

Wolf-Dieter Gruhle

Thilo Schmidt

Wolfgang Schmid

Willi Seidel

Joseph Petersmann

Heinz Stehle

Walter Frei

Peter Wendel

Thomas Wehr

Ronald Schwamm

Thomas Foeldi

Ludwig Hamm

Georg Gierer

Andreas Piepenbrink

Bernd Fessler

Manfred Schwab

Hans-Dieter Hengstler

Andreas Kruttschnitt

Anton Welte

Thomas Knapp

Udo Judaschke

Jochen Nussbaumer

Jürgen Hörsch

A proportional pressure adjustment valve is described which comprises one valve part with inlet and outlet openings () and at least one closing mechanism () for control of a valve (), the same as a magnet part having one magnet core, one magnet coil and one displaceably disposed magnet armature. An actuating element () cooperates with the armature, actuating the spherical closing mechanism (). The hydraulically active cross section of the valve () is essentially determined by the length of the valve (L), the diameter of the valve (D) and th diameter (d) of the part () of the actuating element () which penetrates into the valve. According to invention, the ratio of the length of the valve (L) to the diameter of the valve (d) is less than 2.0.

Proportional pressure adjustment valve

A continuously variable transmission for a motor vehicle, possessing a variator (') with a primary V-pulley set (&#x2032;) and a secondary V-pulley set (&#x2032;). In this arrangement are a primary V-pulley disk (&#x2032;) and a secondary V-pulley disk (&#x2032;), which are axially slidable by hydraulic force for the controlled adjustment of a pressure can be, respectively, loaded with an oil flow through an electro-hydraulically controlled pressure supply apparatus (&#x2032;). The pressure supply apparatus (&#x2032;) is so designed, that the oil flow is brought to the V-pulley disks (&#x2032;) through a pressure line (&#x2032;) with at least one pressure controller (&#x2032;) and one pressure chamber (&#x2032;) with a variable volume (VV). The pressure chamber (&#x2032;) of the primary V-pulley disk (&#x2032;) can be connected to a primary chamber&#x2032;) of the cylinder (&#x2032;), and the pressure chamber (&#x2032;) can be connected with a secondary chamber (&#x2032;) of said cylinder (&#x2032;), in which, between the primary chamber (&#x2032;) and the secondary chamber (&#x2032;) a double action, reversible piston (&#x2032;) is placed for directing pressurized oil from a low pressure side to a high pressure side of the variator (&#x2032;) upon the shifting of said variator (&#x2032;).

Continuously variable transmission

The invention relates to a proportional valve, especially for regulating the shifting pressure in an automatic transmission for a motor vehicle. The inventive valve is subdivided into a hydraulic section and into an electric section by a magnetic interface (XXXX). The bearing points ( ) of the hydraulic valve slide are arranged on the side of the valve opposite the electric coil, i.e. in the hydraulic section, so that the armature ( ) projects into the coil space in a floating manner.

Proportional valve

Pressure regulating valve comprising a connection for a pressure line (P), a connection for a working line (A), a connection for an outlet line (T) communicating with the ambient pressure and at least two diaphragm stages with defined or definable drag, the two diaphragm stages being connected to each other in a variable manner and subject to mechanical or hydraulic action according to the principle of the hydraulic half bridge. The two variable diaphragm stages are provided as the inlet and outlet diaphragms of a pressure regulating chamber ( ) and each has a sealing element, said sealing element ( ) of the inlet diaphragm ( ) is designed as ball, or calotte, ortruncated cone, or cylinder and/or the sealing element of the outlet diaphragm is designed as ball, or calotte, or truncated cone, or cylinder.

Pressure regulating valve

Device for controlling the gear ratio of a continuously variable

Desired performance input fuzzy logic control system for automatic

Gear-change control system for an automatic transmission

Shifting device for a motor vehicle continuously variable transmission

Control system for changing automatic gears

Process for controlling the torque of an internal combustion engine

Process and device for controlling a clutch

In order to adapt the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission continuously to the dirver's driving style or to a just existing or real time traffic situation, the driving speed (v), the lateral acceleration (aq), the longitudinal acceleration (alb), the longitudinal deceleration (alv) and the engine rotational speed (nmot) in addition to the throttle valve position alpha, are detected and by way of characteristic diagrams and a linking function are added to form a parameter from which, by filtering, a driving activity is determined. This driving activity is finally used for the selection of a shifting program from a plurality of shifting programs ranging from a consumption-optimized shifting program (SKF1) to a power-optimized shifting program (SKF5).

Method and apparatus for controlling an automatically shifting

In order to improve the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission particularly during cornering and braking, the driving speed (v), the lateral acceleration (aq), and the time variation of the throttle valve position are sensed in addition to the throttle valve position (alpha) and the engine rotational speed (nmot). From the time variation of the throttle valve position, a signal can be derived for the prevention of an upshifting operation since a motor vehicle driver's foot moves away faster from the accelerator pedal when approaching a bend in the road than would be the case for the normal deceleration of the motor vehicle.

Method and apparatus for controlling an automatic shift transmission

Growing community of inventors

Ravensburg, Germany

Wolfgang Runge