Robert Boschgmbh

Peter Zieher

Karl-Heinz Hagele

Bernd Taubitz

Kurt Engelsdorf

Rainer Burkel

Quang N Tran

Hans Kubach

Armin Schuelke

Claus Kramer

Bernd Dittmer

Rainer Bitzer

Rainer Wirtz

Franz Maurer

Eberhard Weiss

Control arrangement

An evaluating circuit for an inductive pickup has a rectangular signal generator for outputing a rectangular signal, a driver stage for supplying a displaement pickup with an input signal produced from the rectangular signal, a phase-coupled rectifier operative for rectifying an output signal of the displacement pickup with consideration of a phase of the rectangular signal, a sweeping/holding circuit for sweeping the rectified output signal in established sweeping time intervals, and a pulse supplying circuit which at predetermined time points produced on flanks of the rectangular signal control pulses for establishing the sweeping time intervals. The predetermined time points are selected so that during the sweeping time intervals established by the time points the output signal after introducing of rectangular pulse in the displacement pickup is substantially naturally oscillated.

Evaluating circuit for inductive displacement pickup

Method of shifting gears of automatic transmission in motor vehicles

A hydraulic shock absorber with automatically adjustable damper force which actuates an electromagnetic rotary adjuster for a control slide that monitors a sole flow cross section. The rotary adjuster is embodied as a permanently excited single-winding rotary adjuster, and because of its permanent magnetic poles in the rotor, even when it is currentless it furnishes a torque that assures safety resetting of the rotary adjuster if the current fails. The hydraulic shock absorber is intended for controlling the undercarriage of a motor vehicle.

Hydraulic shock absorber

A shock absorber for use in motor vehicles which includes a piston within a packet, inside the piston the entire quantity of the damping fluid exchanged between two work chambers flows via a throttle cross section the size of which is defined by an electromagnetic adjusting device comprising primarily a magnet coil and an armature. The armature is annular and merges with an annular control slide provided with a slide control edge, which slide, in cooperation with a piston control edge on the piston determines the size of the throttle cross section. The control slide and armature are statically in pressure equilibrium, and because of their annular embodiment they have only a slight weight, so that the shock absorber operates with short adjusting times. By a defined profile of the slide control edge or piston control edge, certain damping characteristics are attainable.

Shock absorber

A shock absorber useful in motor vehicles which includes a piston inside of which an entire quantity of a damping fluid exchanged between two work chambers flows via a throttle cross section the size of which is defined by an electromagnetic adjusting device comprising primarily a magnet coil and an armature. The armature is annular and merges with an annular control slide provided with a slide control edge, which slide, in cooperation with a piston control edge on the piston determines the size of the throttle cross section. The control slide and armature are statically in pressure equilibrium, and because of their annular embodiment they have only a slight weight of their own, so that the shock absorber operates with short adjusting times. By way of a defined profile of the slide control edge or piston control edge, certain damping characteristics are attainable.

A valve assembly for controlling fluid flow between a fluid source and a load has an intake valve having a valve body displaceable between a closed position preventing flow through the intake valve and an open position permitting such flow and an output valve having a valve body displaceable between a closed position preventing flow through the output valve and an open position permitting such flow. Conduits or passages connect the valves in series between the load and the source so that fluid can only flow between the load and source when both of the valves are in their open positions. Respective biasing units urge each of the valves into one of its positions and respective electromagnet-type actuators are electrically energizable to move each valve into the other of its positions. The one position of one of the valves is the closed position and the one position of the other valve is the open position. In addition the two valves are substantially identical. As a result the response times of these two valves will be identical also and will change identically with time or temperature, since substantially the same flow is traversing both valves.

Electromagnetically operated dual-valve flow-control assembly

To turn a thyristor, particularly a high-voltage thyristor, ON, and to connect the thyristor and the utilization circuit to a power source, a charge capacitor is connected to a charging circuit to charge the capacitor when the thyristor is blocked or in OFF state. A controlled switch, typically a transistor 20, is connected to the charge capacitor 19 and connects the charge capacitor to the gate electrode of the thyristor, when the controlled switch is turned ON; a control circuit is connected to the controlled switch which includes an opto-coupler 28 to control its conduction. Preferably, a threshold sensitive element such as a Zener diode 25, or a four-layer diode 30, is included in the controlled switch transistor base circuit to provide for sharp turn-on characteristics. Since the conduction characteristics of the controlled switching transistor 20 will depend on the charge state of the capacitor 19, the controlled switching transistor will be conductive only when the capacitor has a sufficiently high charge for reliable firing of the thyristor.

Switching circuit for high-voltage thyristors

A differential amplifier is arranged to amplify faithfully the voltage produced by an ungrounded voltage source to provide the amplified result as a voltage in relation to a reference (ground) voltage. Errors resulting from leakage resistances between the ungrounded voltage source and ground are avoided by providing an inverting amplifier responsive to the output voltage, which draws, through a resistance, a current from a terminal of the voltage source which is proportional to the output voltage of the differential amplifier. This causes a shift of the potential of the voltage source in the direction towards the reference voltage. Optimum results are obtained when the shift is such that the variations in the voltage source being observed are caused to become balanced in relation to the reference potential. As applied to a thermocouple voltage source located in a furnace or engine, the circuit can be made to become balanced when there is a small residual current through the thermocouple, so that a fracture of the thermocouple will produce an immediately recognizable response.

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Eberdingen, Germany

Peter Zieher