Thomson-csf

Christian Menard

Philippe Chabbert

Alain Chatenay

Dominique Meux

Patrick Lorinet

Philippe Gaches

Servocontrol process for a servovalve which can be servocontrolled in

A device for the control of a hydraulic slide valve. The hydraulic valve being put into motion by a motor and by a draw-back spring, the device including structure for controlling the rotational direction of the motor as a function of its positional error, the control structure being, in turn, controlled by a signal given by a correction circuit, the transfer function (K(s)) of which corrects a jet effect that is exerted on the slide valve. The device has application to hydraulic systems requiring large passbands.

Control device for a hydraulic slide valve

Method of recalibrating a battery energy management processor

The device according to the invention includes at least one rotational actuator fitted with a return spring and a connecting rod connected to the rotational actuator to transmit a linear movement to a mechanical part. The rotational actuator is moved by a rotational electromagnet whose angular position is controlled by a pulsed, periodic current. The device also includes apparatus for removal of the magnetizing energy stored in the electromagnet.

Device for energy transmission for mechanical control, in particular for

The adherence of a wheel to a braking track is defined by a point of operation that is variable on an adherence curve as a function of the slip of the wheel. In operation, the braking torque servo control parameter utilized is the sign of the variation of the slope of the adherence curve at the above-mentioned point of operation. The braking torque is servo-controlled in such a way that this point of operation is the same as the point of maximum adherence of the adherence curve.

Method and device for the braking of vehicles by the servo-control of

An internal combustion engine with M cylinders having an electronic ignition system, a pistons position sensor having a set of M+1 identical conductive members, which are synchronous with rotation of the engine's crankshaft. M of the conductive members are regularly spaced. Two fixed detectors adjacent the rotating members sense the members and supply identical electrical signals. The detectors are spaced to provide the signals out of phase by an amount that is substantially higher than the maximum ignition advance of the engine. Electronic circuits process the signals from the two detectors, include a first circuit that supplies a synchronization signal for the cycle igniting the engine, and a second circuit, which supplies two representative synchronization signals of the static advance and of the maximum dynamic advance during ignition.

Shaft position sensor for internal combustion engine equipped with an

An electronic ignition system for an internal combustion engine allowing precise control of the instant of ignition of the air-fuel mixture, in which the mechanical components, particularly the high voltage distributor, are eliminated. This system comprises a transducer delivering two cyclic sequences of signals synchronous with the position of the stroke of the pistons, means for controlling the instant of emission of the sparks in all the operational states of the engine, distributing means supplying release signals to spark generators connected to the spark plugs. Application to internal combustion engines, particularly to multicylinder engines.

Electronic ignition system and an internal combustion engine equipped

An electronic control for an internal combustion engine, and for precisely controlling the instant at which the ignition sparks are emitted. It is fitted with an electronic contact breaker and with sensors for measuring physical parameters characteristic of the conditions under which the engine is operating. This control comprises two channels whose operation is mutually exclusive, namely a first channel which operates when the engine is started and is idling, and a second channel which operates when the engine is running at high speed and under load. The control is applicable to electronic ignition systems for internal combustion engines with controlled emission.

Growing community of inventors

Villennes s/Seine, France

Christian Menard