Robert Boschgmbh

Hubert Mohaupt

Werner Schumacher

Heinrich Lodige

Roland Schempp

Horst Hesse

Heinrich Kochendorfer

Winfried Arnold

Friedrich-Wilhelm Hofer

Raimund Skambraks

Helmut Hones

An electro-hydraulic arrangement regulating the lifting mechanism actuatable by a hydraulic motor, on an agricultural working vehicle having a driven wheel, comprises a plurality of sensors including a position sensor forming an actual value position signal, a force sensor forming an actual value force sensor, and an additional sensor forming an actual value slippage signal dependent on slippage of the driven wheel, a nominal value transmitter, a first summation point connected with the additional sensor and with the force sensor so as to obtain the slippage-dependent signal and the actual value force signal therefrom and to produce an output signal, a mixing device having a first input connected with the first summation point and for receiving the output signal and a second input connected with the position sensor for receiving the actual value position signal and producing an output signal, and a second summation point connected with the mixing device for receiving the output signal of the mixing device and also connected with the nominal value transmitter for receiving a signal from the latter so as to form a regulating deviation for the lifting mechanism.

Agricultural working vehicle with electro-hydraulic for regulating

A control arrangement for a hydraulic motor has an adjustable pressure medium supply device with a container, an unblockable check valve with a control connection, a plurality of chambers including a supply chamber, a motor chamber, first and second return chambers, and a control chamber, a control slider displaceable relative to the chambers, wherein a control conduit extends from the supply device and leads to the control chamber, a first pressure control member is arranged on the control slider so that in a lowered position of the latter the first pressure controlling member is located between the control chamber and the second return chamber and the control slider in its raised position blocks the control chamber, and a second pressure controlling member located between the control chamber and the motor chamber and opening into the latter.

Control arrangement for hydraulic motor

To control the turning direction of a vehicle having wheels with fixed axles or tracks at the respective sides of the vehicle, a steering wheel (1) is coupled to a wheel position transducer (11); a direction control lever (2) is coupled to a position transducer (12), providing forward and reverse (F-REV) driving direction signals. The signals are so arranged that, for turning in respectively opposite directions, signals of positive or negative polarity, with a level varying with the turning radius, are provided; for forward or reverse, respectively, signals of varying polarity are provided. The turning direction signal and the driving direction signal are processed including addition and subtraction, to control independent drive motors (4, 6; 5, 7) at the respective right and left (R-L) sides of the vehicle such that the motor at the inside of the curve will receive a signal which has a lesser algebraic value than the driving direction signal, and the motor at the outside of the curve will receive only the driving direction signal, to cause the wheel at the inside of the curve to rotate slower, or with reverse direction of rotation than that at the outside of the turning circle.

Method and apparatus for steering a vehicle with fixed-position wheels

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Bietigheim, Germany

Hubert Mohaupt