Abstract: A control system controls a DC motor which operates a shifting mechanism. The control system includes switch circuit with a plurality of switches which connect terminals of the motor to a power supply. In order to limit the speed and torque, the control system operates the DC motor via pulse-width modulation so that the DC motor is alternately operated in a supply mode and in a short-circuit mode. The alternating supply and short-circuit modes result in operating states in which the motor is alternately driven and decelerated. Consequently, the speed and torque of the DC motor can be limited by the pulse-width modulation of control signals.

Abstract: A cooling system for an agricultural vehicle, such as a tractor driven by an internal combustion engine includes a main cooling system containing a coolant. The cooling system includes a sorption cooling system which includes an evaporator for evaporating a refrigerant, a sorption chamber for the sorption of the refrigerant vapor, a desorption chamber for the desorption of the refrigerant from the sorbent, and a condenser for condensing the refrigerant. An exhaust gas stream from the engine is conducted to the desorption chamber to provide the heat necessary for the desorption. The evaporator is used for additional cooling of the coolant of the main cooling system and/or for cooling a second exhaust gas stream from the engine.

Abstract: A fluid liquid/fluid gas heat exchanger includes a hollow housing through which one of the fluids flows and whose exterior is exposed to the other fluid. The housing rotates about one or more non-rotating tubes which form inlet and outlet openings.

Abstract: An axle assembly has a fixed axle housing, a rotating axle body rotatably mounted in said axle housing, and a first chamber which surrounds the axle body. The first chamber is partially bounded by a ring member which rotates with the axle body. An annular disc is mounted on the axle body adjacent to the ring member. The disc extends radially outwardly beyond an outer rim of the ring member and radially overlaps the ring member. The disc is axially slidable towards and away from the ring member. When the disc is spaced apart from the ring member an opening or space is formed therebetween through which may be communicated pressurized air to inflate a tire. The disc is moved axially by a ring mounted on an annular piston member which is mounted on and axially movable with respect to the axle housing.

Abstract: A vehicle transmission transmits torque from an engine to a drive axle and includes a power shift transmission and a reverser module. A control system and method automatically partially disengages the reverser module during a shift of the power shift transmission with nearly no effect upon the operating condition of the engine, so that a portion of the torque generated by the engine continues to be transmitted at all times to the drive axle.

Abstract: A drive system for vehicles, especially for commercial vehicles such as agricultural or industrial tractors, the vehicle having at least one first wheel that is driven by an associated axle or single-wheel drive motor and at least one second wheel, in the drive train of which a gearbox that can be shifted between at least two speed transmission steps is arranged. To avoid vehicle speed drops while shifting the change-speed gearbox and to avoid interfering shifting jolts, it is suggested to provide a device for the detection of a shift command and a control unit, which in the presence of a shift command automatically applies a greater load at least on the drive motor driving the first wheel, controls the shifting operation of the change-speed gearbox of the second wheel and then lowers the load of the drive motor driving the first wheel.

Abstract: The present invention concerns a drive arrangement for the drive of attached implements for a vehicle, particularly an agricultural or industrial utility vehicle, with a combination gearbox, an electrical machine and a power take-off shaft, where a gearbox interface of the combination gearbox can be driven by an internal combustion engine and where the electrical machine is connected with a second gearbox interface of the combination gearbox. In order to make available a variable power take-off shaft rotational speed that is independent of the rotational speed of the internal combustion engine, the drive arrangement according to the invention is characterized by the fact that the power take-off shaft is connected with a third gearbox interface of the combination gearbox. Furthermore the present invention concerns a vehicle with such a drive arrangement.

Abstract: A vehicle having a tire pressure adjusting device for regulating the pressure of tires which has a valve arrangement between a compressed air source and the tires is described. To reduce the energy expenditure required for filling the tires and to be able to keep the filling pressure as low as possible, the turbocharger of the vehicle engine serves as the compressed air source. The charge air channel of the turbocharger is connected with the valve arrangement.

Abstract: A PTO clutch of an agricultural vehicle connects an input driveline to an output driveline for coupling to an attached implement. A method and system for controlling the PTO clutch includes sensors for sensing rotational speeds on both sides of the clutch. Clutch slip is determined from the sensed speeds. A controller receives an actual slip signal and a desired slip signal and controls pressure in the clutch to maintain a constant desired clutch slip in order to avoid overload conditions. The torque transmitted by the clutch is determined as a function of the slip in the clutch and the clutch pressure, and a signal representing this torque is displayed to an operator.

Abstract: A control system controls a DC motor which operates a shifting mechanism. The control system includes switch circuit with a plurality of switches which connect terminals of the motor to a power supply. In order to limit the speed and torque, the control system operates the DC motor via pulse-width modulation so that the DC motor is alternately operated in a supply mode and in a short-circuit mode. The alternating supply and short-circuit modes result in operating states in which the motor is alternately driven and decelerated. Consequently, the speed and torque of the DC motor can be limited by the pulse-width modulation of control signals.

Abstract: A control lever controls movement of a system to be controlled. The control lever includes a manually operable handgrip attached to a platform. At least six connecting elements are arranged between the platform and a fixed console. Length sensors sense the length of the connecting elements, and/or force sensors sense forces acting on the connecting elements. A control unit evaluates the sensor signals and generates a control signal for controlling movement of the system. The connecting elements are be arranged in the form of a hexapod. The connecting elements may be telescoping members or rigid fixed length members.

Abstract: A system and method for sensing and evaluating the rotation of the auxiliary drive of a utility vehicle is provided. The utility vehicle includes a main drive engine, a gearbox for the propulsion drive and at least one auxiliary drive to which an implement can be selectively connected. The power output of the main drive engine is branched to a first part to a propulsion drive and to a second part to the auxiliary drives. A rotation speed sensor senses rotation speed of the auxiliary drive and provides a speed signal to a control unit. The control unit determines the magnitude or amplitude of the second harmonic of the speed signal and transmits corresponding control signals when a predetermined threshold value is exceeded and/or is not reached. When the control unit determines that the second harmonic of the sensor signals exceeds the threshold value, it permits an increased power output of the main drive engine.

Abstract: A PTO clutch of an agricultural vehicle connects an input driveline to an output driveline for coupling to an attached implement. A method and system for controlling the PTO clutch includes sensors for sensing rotational speeds on both sides of the clutch. Clutch slip is determined from the sensed speeds. A controller receives an actual slip signal and a desired slip signal and controls pressure in the clutch to maintain a constant desired clutch slip in order to avoid overload conditions. The torque transmitted by the clutch is determined as a function of the slip in the clutch and the clutch pressure, and a signal representing this torque is displayed to an operator.

Abstract: A control device for the parking lock of a motor vehicle has at least one actuating drive (46) that can be operated by triggering devices and with which a locking device (11) can be moved between engaged and disengaged positions. For reliable operation, at least two independent triggering devices are provided and a change in position takes place only if both triggering devices (56, 58) are actuated. Preferably a hydraulic piston (46) brings the parking lock into its disengaged position when subjected to pressure. The triggering devices are constructed as solenoids (56, 58) under the control of two electrical controllers (140, 142) that undertake an evaluation of relevant control and measurement parameters.

Abstract: A vehicle having a tire pressure adjusting device for regulating the pressure of tires which has a valve arrangement between a compressed air source and the tires is described. To reduce the energy expenditure required for filling the tires and to be able to keep the filling pressure as low as possible, the turbocharger of the vehicle engine serves as the compressed air source. The charge air channel of the turbocharger is connected with the valve arrangement.

Abstract: A control lever controls movement of a system to be controlled. The control lever includes a manually operable handgrip attached to a platform. At least six connecting elements are arranged between the platform and a fixed console. Length sensors sense the length of the connecting elements, and/or force sensors senses forces acting on the connecting elements. A control unit evaluates the sensor signals and generates a control signal for controlling movement of the system. The connecting elements are be arranged in the form of a hexapod. The connecting elements may be telescoping members or rigid fixed length members.

Abstract: A control device for the parking lock of a motor vehicle has at least one actuating drive (46) that can be operated by triggering means and with which a locking device (11) can be moved between engaged and disengaged positions. For reliable operation, at least two independent triggering means are provided and a change in position takes place only if both triggering means (56, 58) are actuated. Preferably a hydraulic piston (46) brings the parking lock into its disengaged position when subjected to pressure. The triggering means are constructed as solenoids (56, 58) under the control of two electrical controllers (140,142) that undertake an evaluation of relevant control and measurement parameters.

Abstract: A system and method for sensing and evaluating the rotation of the auxiliary drive of a utility vehicle is provided. The utility vehicle includes a main drive engine, a gearbox for the propulsion drive and at least one auxiliary drive to which an implement can be selectively connected. The power output of the main drive engine is branched to a first part to a propulsion drive and to a second part to the auxiliary drives. A rotation speed sensor senses rotation speed of the auxiliary drive and provides a speed signal to a control unit. The control unit determines the magnitude or amplitude of the second harmonic of the speed signal and transmits corresponding control signals when a predetermined threshold value is exceeded and/or is not reached. When the control unit determines that the second harmonic of the sensor signals exceeds the threshold value, it permits an increased power output of the main drive engine.

Abstract: A control device for an infinitely variable transmission includes a control lever that is movable along a guide slot and whose position within the slot indicates the commanded speed and direction. The control lever is moved forward from a zero speed position to a maximum forward speed position. Between the zero speed position and maximum forward speed position is a set point position corresponding to a set point speed. A set speed adjuster, such as a potentiometer, enables the operator to adjust the set point speed that is commanded when the control lever is placed in the set point position. The speed for positions of the control lever between the zero and the set point positions varies proportionally between zero and the set point speed. Likewise, the speed for positions of the control lever between the set point position and the maximum forward speed position varies proportionally between the set point speed and the maximum forward speed.