Abstract: Device for electrical actuation of the accelerator of an internal combustion engine, particularly of a motor vehicle, comprising a reduction gear interposed between an electric motor and an element for actuating the accelerator. The reduction gear comprises a planetary gear train whose sun gear 12 is solid in rotation with the shaft of the electric motor. An internal ring gear 11 is connected to the actuation element 4 and the planet carrier 14 is pulled elastically by a return spring 15 to actuate an electric contact switch 17.

Abstract: Fuel tank of synthetic material for motor vehicles has an expansion and venting system and consists of a main enclosure extended upward by an expansion chamber in which is housed filling pipe at the upper part of which is tapped a gas evacuation line including an expansion chamber and a siphon. A line further joins the upper part of an inlet pipe to another expansion chamber, forming a circuit with a hydraulic check valve.

Abstract: A method and apparatus for determining the coordinates of a point of contact of an object on a semianalog sensitive surface. The coordinates are of a zone of contact of a conductive object such as a finger on a sensitive surface. The surface consists of an insulating support having a grid formed by two terminals between which a certain number of emitting resistant strips are connected in parallel and detecting conductive strips, placed between the resistant strips. The conductive strips are connected separately to a selection switch making it possible successively to sample the voltage of each detecting strip. The operation is performed in two phases by polarizing the two terminals of the grid, first in phase, then in opposite phase, and in each phase of the process the averages are taken of a certain number of synchronous samples which make it possible to determine the two coordinates.

Abstract: According to this process, during the starting and stopping of at least one accessory device (12) that causes a sudden variation in the resisting torque, signals controlling the starting and the stopping of the accessory device (12) are detected, and the control of the accessory device (12) is temporarily delayed by said control signals. There is controlled, for a first predetermined time period (T.sub.1), an increase in the airflow of the engine in response to the detection of a signal controlling the starting of the accessory device, and for a second predetermined time period (T.sub.3), a decrease in the airflow in response to the detection of a signal controlling the stopping of the accessory device. The starting and the stopping respectively of the accessory device (12) are controlled approximately at the end of the predetermined periods.

Abstract: A gearmotor for the alternate drive of two operations has a housing which receives a drive pinion, mounted on the output shaft of the reduction gear. The drive pinion is able to engage alternately with a first rack cable A and a second rack cable B, both mounted parallel in a sliding guide that can move in the housing in a plane perpendicular to the shaft of the drive pinion between two end positions in each of which one of the two cables is engaged with the drive pinion while the other cable is in a disengaged position. A device is provided for actuating the sliding guide. Application is particularly for electrical equipment of a motor vehicle side door.

Abstract: Control device of an automatic transmission having four forward speeds with shifting under torque together with a hydrokinetic torque converter with an integrated torsional damper, and one reverse speed, of the type comprising a planetary gear train controlled by three clutches and two brakes with hydraulic control. A hydraulic distributor controlled by four solenoid valves selectively feeds the clutches and brakes, depending on the running conditions of the vehicle. The control means of the solenoid valves are made to use two states of one of these solenoid valves to allow fast filling and progressiveness of the active receiver or receivers during shifting and two states of the other solenoid valves to assure the various sequences during shifting.

Abstract: Rear axle assembly for the suspension of motor vehicles. An arm consisting of a hollow box, provides support by its lower box face to one of the ends of a spring leaf extending therein. The other end of the leaf spring is connected to the body by a shackle.

Abstract: The contactless angular displacement and/or torque pickup is characterized in that it comprises two electrically insulating coaxial disks (7a, 7b) that can turn in relation to one another by an angle to be detected and that carry on their opposing faces conductive plane coils (8) in the shape of spirally wound sectors coiled alternately in both directions and whose mutual induction varies as a function of the relative angular position of the detection disks (7a, 7b). Also included is a rotary transformer (6a, 6b) to supply one of the detection disks (7a, 7b), a circuit (18) for supplying the primary (11a) of the rotary transformer and a circuit (17, 18) for processing the signal (S) collected on one of the detection disks (7a, 7b).

Abstract: Pressure control device comprising a manual valve (VM) associated with a pressure control valve (VRP), includes a first line pressure (P.sub.L), defined by two calibrated jets in series, which are placed on a duct set at zero pressure by the manual valve (VM) being in a first position R. At a second line pressure range (P.sub.L), a duct is fed at line pressure (P.sub.L), the manual valve (VM) is in a second position A. A variation of line pressure (P.sub.L) is assured by a modulating solenoid valve (EVM), which establishes a modulated pressure (P.sub.M) acting on a differential section (.SIGMA.) of said pressure control valve (VRP).

Abstract: Control device of a continuous transmission associated with a heat engine and with a reversing converter whose turbine shaft is either made solid with the shaft of the reactor to obtain forward, or made solid with the housing to obtain reverse, characterized in that said control device generates an input speed set point of the variable speed drive (12) for reverse, which is different from the input speed set point of the variable speed drive for forward; so as to obtain, during the sliding time of the converter in reverse, a transmission ratio of the variable speed drive (12) which is lengthened and becomes longer than the one of forward.

Abstract: Two-level pressure control device has a pressure control valve VLP 3 associated with a system of jets and in series to obtain a first reference pressure level P.sub.1 and a second reference pressure level P.sub.2.

Abstract: A number of displays are made by the combination of numerals and pictographs on an indicator which provides numerical values of information obtained from desired signals selected from display signals wherein units and meanings of the numerical values are obtained by operating a single selection switch which drives a selector and a single reset switch which resets a driving distance computing circuit and a running time computing circuit. The selection switch and the reset switch are installed integrally on the face plate of the single indicator used.

Abstract: A process and apparatus for controlling the air flow at the intake of a heat engine fed by fuel injection. The air flow is controlled as a function of the rotational speed of the engine, particularly in the vicinity of the rated idling speed. The control point is determined as a result of a filtering made on a value linked to the instantaneous value of the rotational speed of the engine followed by a weighted average between the filtered value and a magnitude linked to the rated idling speed.

Abstract: A piston (2) is of refractory materials, particularly for a compression-ignition engine of the type having a head (4), a skirt (6) and their mutual fastening means. According to the invention, this skirt (6) is formed entirely of a refractory material and has two semicylindrical parts (18, 20) each of which has ribs (22) and a semispherical cavity (36, 38). After assembly, the cavities form a ball joint seat for the small end of a piston rod along a plane containing the longitudinal axis (14) of the piston (2). Application is to compression-ignition engines with high efficiency.

Abstract: A display unit of a speedometer meter for an automobile, wherein a desired car speed is determined and an actual car speed is measured and signals corresponding thereto are applied to a comparing circuit and bar graph decoders. The comparing circuit compares the amplitude of the signals corresponding to desired car speed and actual car speed, and the bar graph decoders, after decoding the signals into a format compatible with a bar graph display, transmits the signals to an EX-OR circuit and an OR circuit.

Abstract: A display unit of a fuel consumption meter for an automobile, wherein a proper fuel consumption is determined and an actual fuel consumption is measured and signals corresponding thereto are applied to comparing circuit and bar graph detectors. The comparing circuit compares the amplitude to the signals corresponding to proper fuel consumption and actual fuel consumption, and the bar graph decoders, after decoding the signals into a format compatible with a bar graph display, transmits the signals to an EX-OR circuit and an OR circuit.

Abstract: A piezoelectric sensitive element has elements for collecting charges appearing between the sides of the piezoelectric element. These elements include a flexible insulating strip having one the same face two distinct conductive layers each of which has an annular layer for contact with the piezoelectric sensitive element and connected by a connecting layer to a terminal layer. Application is to the detection of pinging in internal combustion engines.

Abstract: A device for controlling the supply pressure of a hydraulic actuator for an automatic transmission of an automobile. A pressure modulator varies the hydraulic pressure depending on the output of a controller. The controller receives input information on engine speed, turbine speed, engine load and vehicle speed. The transmission is controlled to be disengaged when the automobile is stopped, and reengaged smoothly.

Abstract: A display unit for a speedometer for an automobile, wherein car speed is sensed and displayed in at least two modes including a standard scale mode when car speed is above a set standard speed, and an enlarged scale mode when car speed falls below a lower set speed. The display unit includes a bar graph display, and a scale display, both of which are controlled in correspondence with car speed to operate in either the standard scale mode or the enlarged scale mode.

Abstract: A process whereby, as a function of the speed and the load of the engine, at least two operating zones are determined, namely a critical zone and a noncritical zone and, in case of detection of pinging in the critical zone, the ignition advance generated during at least one of the following engine strokes is delayed. More precisely, in response to the detection of pinging of a cylinder in the critical zone, the ignition advance of the cylinder is delayed by n.sub.1 +n.sub.2 degrees in relation to the programmed law of advance and the return to the programmed advance of said cylinder is controlled at a fast rate of return and a slow rate of return by decrement of n.sub.1 at a high speed and of n.sub.2 at a slow speed respectively and, in the presence of a fast rate and/or slow rate correction during a passage from the critical zone to the noncritical zone, the fast rate of return correction is cancelled, the slow rate state is stored, and the advance correction and the decrement of n.sub.