Abstract: An electromagnet and plunger assembly including a ring-shaped solenoid coil having a fixed pole component which extends from the one end into the interior of the solenoid coil. Movable in the axial direction, the plunger extends from the other end into the interior of the solenoid coil. A control device serving the adjustment of the armature pull comprises a sensor element measuring the magnetic induction. The pole component is subdivided in two pole parts which are coaxially nested and between which an annular gap is formed. The annular gap is sealed with a magnetically nonconductive material on its end facing toward the plunger. The sensor element is located in the annular gap in the interior of the solenoid coil.

Abstract: A device for controlling a motor vehicle clutch is disclosed. A hydraulic control system coupled to the disengagement lever of a clutch selectively engages and disengages the clutch responsive to a control signal. The control signal is generated by a control circuit which receives a first signal representative of the speed of the vehicle and a second signal representative of the rotary speed of the engine. The control circuit varies the control signal during each engagement of the clutch as a function of two components: a first component which initially varies as a substantially linear function of the speed of the vehicle and thereafter varies as a positive exponential function of the speed of the vehicle; and a second component which varies as a substantially linear function of the speed of the engine. Both components vary in a direction which drives the clutch further into engagement for increasing vehicle and engine speed.

Abstract: A multiple-transmission-ratio transmission arrangement includes at least first and second transmission-ratio-establishing units, for example brake bands and/or clutches, having hydraulically activated and unactivated states and operative in the hydraulically activated state for establishing respective first and second transmission ratios. An arrangement for changing the transmission ratio of the transmission arrangement comprises, in combination, a source of hydraulic activating fluid and conduits connected to the source and to the hydraulically activatable transmission-ratio-establishing units. Electrically controllable valves in the conduits are operative for alternately permitting and preventing the supply of hydraulic activating fluid to the transmission-ratio-establishing units.

Abstract: The transmission arrangement includes first and second hydraulically activatable units. When the first and second units are activated and unactivated, respectively, the arrangement exhibits a first transmission ratio. When the first and second units are unactivated and activated, respectively, the arrangement exhibits a second transmission ratio. Electrically controllable first and second valves each connect an associated unit to a source of hydraulic fluid. A transmission-ratio changeover is effected by causing the valves to undergo opposite changes of energization state. Each valve has its own time-delay stage. Upon receipt of a signal commanding a transmission-ratio changeover, each time-delay stage delays the initiation of the change of energization state of the associated valve by a respective time-delay interval.

Abstract: A torque-delivering vehicle drive system having a friction clutch actuated by a pressurized medium, a hydrodynamic working circuit including a pump wheel and a turbine wheel, operatively connected to the friction clutch and a device including an operating lever for adjusting pressure and/or rate of flow of the pressurized medium to the friction clutch including a regulating device for maintaining the torque delivered by the vehicle drive system at a constant value corresponding to a given position of the operating lever, and means for supplying to the regulating device a measured quantity that is a function of a difference in working fluid pressure producible by the pump wheel of the hydrodynamic working circuit.