Jaeger

Regie Nationale Des Usines Renault

Magneti Marelli France

Jean-Jacques Bezard

Bruno Lalanne

Charles H Jourdain

Philippe Feppon

Pierre Rodionoff

Catherine Jury

Charles-Henri Jourdain

Robert Faure

Alain Bonutto

Bernard A Delevallee

A vehicle data display device which draws the attention of the driver to a particular sector of the road scene, including an optical system that presents to the driver a reduced virtual image of the road scene embellished with a luminous signal. The luminous signal can be used to designate a target for the driver and can be under the control of an onboard driving assistance system. The vehicle data display device can be integrated into the steering column or dashboard of the vehicle and facilitates perception of driving assistance or navigational data without the driver having to turn his attention away from the road.

Data display device for a vehicular highway driver

Head-down type optical device for delivering information to the driver

The invention relates to a device for detecting the presence of extraneous substances in a medium in the vicinity of a wall separating two mediums. The device provides in the medium I illumination of a wall under a radiation corresponding to the transparency of the semi-transparency of the material of the wall on a reference illumination zone. Directional detectors permit covering of the reference illumination zone, the mean direction of the reception cone having with respect to the mean direction of the beam an inclination such that the intersection volume of the beam and of the reception cone is a minimum. Application to the aid of driving of automobiles or airplanes and the control of industrial chemical processes is disclosed.

Device for detection of extraneous substances through a wall and a

Apparatus for monitoring the level of liquid in a tank or reservoir comprises a probe formed by a resistive metal element having a high temperature coefficient, and a supply means for the probe. The apparatus further comprises a voltage-frequency converter which is connected in parallel with the probe, two counters which are connected in parallel to the output of the converter, and a subtracting means connected to the outputs of the counters. A time base controls operation of the supply means during a complete cycle to effect a counting operation of the first counter for a given period of time at the beginning of a cycle, a counting operation of the second counter for the same period of time but at the end of the cycle, and operation of the subtracting means at the end of the cycle.

Apparatus for monitoring the level of liquid in a tank or reservoir

A hot-wire level detecting apparatus includes a micro-processor which registers a look-up table of digital level values associated with digital values of a differential parameter representing the change in the voltage or current in the hot-wire probe. The micro-processor controls a switch for initiating the application of power to the probe. In one embodiment a constant voltage supply is connected across the emitter and collector of a transistor with the probe in the emitter circuit and a resistor in the collector circuit. The voltage across the resistor, measured at switch-on and after a period for stabilization, is fed to the micro-processor by an analog-digital converter.

Apparatus for monitoring the level of liquid by resistive wire

A device to make a measurement of a variable quantity such as the speed of rotation of a first shaft or the speed of operation of an ignition system of an engine, wherein electrical pulses are produced at a frequency which is a function of the speed. The device comprises fixed first and second coils having axes in a common plane, and the planes of the coils are disposed at right-angles. Square waves corresponding to the pulses energize the first and second coils alternately, and each successive energizing of each coil is in an alternate direction, thus the magnetic field produced by the coils rotates continuously and rotates a disc magnet within the coils about an axis in the planes of the coils at an angular velocity which is a function of the speed. A rotor of conducting material in the form of a cylindrical cap over and about the magnet is integral with a second shaft coaxial with the magnet. Eddy currents induced in the rotor by the rotating magnet result in the rotor rotating in the magnetic field of the coils to rotate the shaft against arresting spring force proportional to the driving torque of the rotor which is a function of the angular velocity of the magnet. Thus a pointer on the second shaft registers a value on a dial corresponding to the speed of the first shaft or ignition system.

Device for measuring the frequency of an electrical current

A device for checking the level of a liquid in a tank, for example a car fuel tank, has an electrical resistance probe partly immersed in the liquid and energized with a constant current. The voltage across the probe at switching on is stored and used as a reference for comparing with the increased voltage after the element has been heated to a value dependent on the length of resistor cooled by the liquid.

Growing community of inventors

La Garenne, France

Jean-Jacques Bezard