Daimler-benz Ag

Gunter Weiger

Paul Schwerdt

Horst Grossner

Dieter Dorrie

Gunter Schwegler

Alfred Ziegenberg

Hans-Jorg Florus

Helmut Hirn

An apparatus is provided for sequentially actuating a pair of valves used to control a flow of brake fluid in a vehicle. Each valve is yieldably biased toward a normal position. The apparatus includes an actuation member that is tiltable in response to movement of a piezoelectric member to accomplish sequential operation of the valve pair, the actuating member being tiltable during a first adjustment stroke counter to the force of the first valve spring about a first axis of rotation defined by a bearing point fixed to the housing and by a compression spring in order to actuate the first valve and move the first tappet to a selected position. The actuating member is also tiltable during a second adjustment stroke counter to the force of the compression spring about a second axis of rotation defined by the bearing point fixed to the housing and by the moved first tappet in order to actuate the second valve.

Actuating device for two mutually dependently actuable valves

Electrically operated valve for liquid or gaseous media, suitable for internal combustion engines, possessing an electrically-activated actuating element with a short actuating displacement, this actuating element acting on a control valve, and possessing a nozzle element which unblocks a nozzle when a defined pressure is present in the supply line. The actuating element is connected to an actuating-element base and is pressed, by means of an actuating-element spring, against the control-valve plate of the control valve, this control-valve plate being pressed, by a stronger control-valve spring, against a fixed reference plane. In order to compensate for changes in the length of the actuating element, resulting from mechanical forces and/or from temperature changes, a collect-type clamping device is provided, which is subjected to the pressure of the medium and clamps the actuating element while it is being operated.

Electrically operated valve

A pressure operated control installation, especially for automotive vehicles, which includes a pressure source and a servo member controlled through a control block. The control block includes a logistor, a control element coupled with a control unit, and a bypass line with a throttling arrangement. The pressure conducting inlet of the logistor is connected through the bypass line to a control inlet of the logistor and the control unit controls a connection between the control inlet of the logistor and a return line. At least two control blocks are provided with a control outlet of the logistor of the first control block and a pressure conducting inlet of the logistor of the second control block being connected to the servo member.

Pressure operated control installation

An electronically controlled actuator arrangement with a temperature-compensated piezoelectric transducer. The transducer includes at least one stack of piezoelectric oxide discs. The actuator arrangement includes a mechanical throw-transmitting lever system arranged in series with the transducer. The lever system includes one or more levers and is integrated into a plane-parallel plate. When the actuator arrangement is in a rest position, a force introduction point or points lies flush with one plane face of the plate and a force deployment point or points lies flush with an opposite plane face of the plate. By virtue of the actuator arrangement, the lever system is not, to any substantial extent, affected by the temperature. The actuator arrangement is especially suitable for rapid-action hydraulic valves.

Temperature compensated piezoelectric actuator arrangement

An acceleration pickup or detector which is provided with a cable outlet located at right angles to a direction of the main vibrations to be detected, especially for detecting knocking signals in internal combustion engines. Connecting elements linking leads of the connecting cable with the acceleration pickup are disposed on a side of the acceleration pickup opposite to the axis of symmetry with respect to the cable outlet. An additional mass is provided on the side of the connecting elements, which mass forms a common counter mass with the connecting elements for the connecting cable.

Acceleration detector

A frequency generator module has a first generator circuit and a second generator circuit, the frequencies of these circuits being variable by a physical parameter, especially a distance or angular value, with two coils arranged coaxially at a mutual spacing on linear or curved, tubular coil holders, the inductance of these coils being variable by a core displaceable in the coil holder. The combined generator module is connected by a control circuit to a changeover switch which alternately switches the output of one of the two coils to the input of the frequency generator module. A short-circuit ring is arranged in an axially normal plane between the two coils, for the duration of a specific number of pulses of the generator circuit formed from the coil and the generator module. A control and/or regulating device is provided which calculates from certain pulses of successive pulse sequences of the two generator circuits the frequencies (f1; f2) and their difference (f1-f2) and/or a correcting value which is the difference between the actual value and the desired value of the sum total (f1+f2) of the frequencies of the two generator circuits. The corrected frequency difference and/or the value of the physical variable derived therefrom is indicated, or a signal proportional thereto is transmitted.

Frequency generator

An installation for the automatic shifting of change-speed transmissions, especially for motor vehicles, in which actuating devices are provided for the engagement and disengagement of the speeds, which are controllable by way of control means by at least two influencing magnitudes, particularly output rotational speed and torque; an electronic control unit having a programmed, constant-value memory device is provided, in which is stored at least one set of output rotational speed limit values coordinated to the individual speeds and torque steps, while at least the influencing magnitudes of torque and engaged speed are adapted to be applied to the electronic control unit by way of corresponding inputs; and output of the constant value memory device is operatively connected with a rotational speed comparison unit, in which the output rotational speed limit values given out by the constant-value memory device are adapted to be compared with the prevailing output rotational speed, whereby in this rotational speed comparison unit shifting-up or shifting-down signals are adapted to be released, when exceeding or falling below the limit values; these shifting-up or shifting-down signals are then applied to the actuating devices.

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Esslingen, Germany

Gunter Weiger