The invention relates to a gear shifting device (118) for connecting components of a gearbox (102) that rotate at different speeds to at least one auxiliary unit. The gear shifting device (118) is actuated by a control fluid. A unit containing valves (4, 5, 6, 7), a shift cylinder (1), a piston (2) and gear shifting elements (2A) is provided for each auxiliary unit. The gear shifting device (118) is actuated by electrically controlled, pulsed 2/2 way valves (4, 5, 6, 7) and is connected to a displacement measuring device (3) whose signals can be transmitted to the 2/2 way valves (4, 5, 6, 7). The signals are used to control the 2/2 way valves according to the position of the piston (2), which is detected by the displacement measuring device (3), with respect to the shift cylinder (1).

Gear shifting device

A transmission with discrete gear ratios has several servo driven selectors between to select the ratios. Each selector comprises a compact system with a number of 2/2 control valves (4-7) and a hydraulic piston (1) connected to the selector (2A). The actual displacement of the piston is measured by a displacement monitor (3) to enable the control system to accurately move the selector with a minimum of response time. The selection of a particular gear ratio is faster than the de-selection. The rate at which the servo is operated, and its timing, is determined by the dynamics of the vehicle e.g., speed, road conditions etc.

Gear selection control for transmission

A method for controlling a magnetic structure including the steps of determining a flux associated with the magnetic structure and generating a control signal based, at least in part, upon the determined flux.

Direct flux control system for magnetic structures

A modular system comprises a head module having at least one connection for an external bus signal on an external bus, at least one pneumatic supply connection, an electric supply connection and having a serial bus interface for an internal serial bus, an electric supply interface, a multipole interface and a pneumatic supply interface which are each led to the outside on the same side. The modular system further comprises at least one functional module having an internal serial bus line, electric supply lines, electric multipole lines and pneumatic supply lines which are each passed through from one side to the opposite side and which are each connected to a corresponding interface of the head module. The head module here converts serial bus signals into multipole signals and outputs these signals at the multipole interface. The functional module selectively branches at least one of the multipole lines and, with a signal carried thereon, executes a pneumatic or an electric or both a pneumatic and an electric function.

Electropneumatic module system composed of individual modules put in a row

A hydraulically operated piston (2) is shuttled to and fro on a slide (9) by fluid pressure from a reservoir (138) through valves (4,5,6,7) selected by a control unit (136) and the gear is selected by a fork (2A).

Gear changing system for stepped reduction gearbox of vehicle

The device transmits the control signals between a bus-line (1) and a number of controlled valves (7-10,13,14) of a valve block via interface elements (3-6,11,12) with input and output contacts for connecting the interface elements in series. Each interface element is associated with at least one valve, with its input contacts coupled to its output contacts via internal cables, with active interface elements (3,11) each provided with a decoder chip connected to the bus-line and having control terminals for the associated valve and further terminals coupled to the other valves via respective passive interface elements.

Control signals transmission device for controlled valves

The circuit has a drive amplifier 10 coupled to the valve actuator 20 and this is supplied by a voltage Uver and receives the output Uaus of a comparator. The comparator operates on a triangular waveform reference T and the command variation signal delta W. The output is fed back via an impedance converter 30. If the output is the same as the comparator supply Uelek then the feedback is independent of the drive supply Uver. If the output is zero the feedback is also zero

Generation of pulse-width modulated signal for controlling electropneumatic pressure control valves

The actuator for a valve has an armature 2 which is displaced into a valve closure position when a coil 4 is energised. In order to reduce the electrical power loss and to increase the operational reliability of the actuator a magnetic flux sensor 3 for detecting a variable proportional to the magnetic flux is connected to the core 1. The magnetic flux sensor 3 is connected to an electronic control device 5 in such a manner that the electrical power supplied to the coil 4 can be controlled by the detected variable proportional to the magnetic flux. The sensor may be a Hall effect device or a magnetic field variable resistor connected in a bridge circuit.

Detecting the operation of an electromagnetic actuator

Device for transmission of control signals to valves

La presente invention concerne une soupape actionnable electromagnetiquement, comportant un noyau magnetique en plusieurs parties, deplacable par segment, par l'intermediaire duquel un obturateur de soupape peut etre actionne au moyen d'une bobine. Selon l'invention, la partie mobile (2) du noyau magnetique presente une liaison par adherence au poussoir ou a l'obturateur de la soupape, le noyau magnetique (1, 2) est relie a un capteur de flux magnetique (3) pour detecter une grandeur proportionnelle au flux magnetique, et le capteur de flux magnetique (3) est relie a un dispositif de reglage electronique (5), de sorte que la puissance electrique amenee a la bobine (4) et, ainsi, l'actionnement du poussoir de soupape sont reglables par l'intermediaire de la grandeur proportionnelle au flux magnetique detectee.

Bernd Dipl Ing Hoffmann

Papers

Control signals transmission device for controlled valves

Generation of pulse-width modulated signal for controlling electropneumatic pressure control valves

Detecting the operation of an electromagnetic actuator

Device for transmission of control signals to valves

Soupape actionnable electromagnetiquement.