Abstract: A line interface for a two wire bus for detecting defects of the bus. The interface includes a shaping circuit having three comparators. The first comparator having two inputs connected to the two wires of the bus, the second comparator having a first input connected to one of the bus wires and another input connected to a reference signal, and the third comparator having a first input connected to the other wire of the bus and the second input connected to a reference signal. A first counter is connected to the output of the first comparator and counts a number of transitions which occur on the bus during a predetermined period of time. If the number of transitions detected by the first comparator is counted to be less than a predetermined number of transitions, the bus is defective. The second and third counters are respectively connected to the second and third comparators.

Abstract: Device for the electrical power supply of a plurality of local electrical apparatuses (12) from a single source (1), including a central bistable switch (3) connected between a terminal of the source and the power supply lines (4) of the apparatuses (12) and a central resistor (7) connected in parallel with said central switch (3), each apparatus (12) including a local resistor (8) and at least one control switch (9) in series between its power supply line (4) and the second terminal of the source, each local resistor (8) forming, together with the central resistor (7), a divider bridge connected to a central detector (10) which controls said central switch (3). Each apparatus (12) comprises means for isolating it from its power supply line (4), means for cancelling the current in the local resistor (8) and means for detecting the closure of the central switch (3) which controls the closure of the isolating means and the opening of the current cancelling means when the central switch closes.

Abstract: Device that makes possible the holding and/or automatic assembly of parts includes tool-carrying arms (40), fluid power circuits that actuate these tools, and control circuits for these power circuits. A support unit (10) has arms (40) mechanically fastened thereto. A fluid distributor (30) is mounted on the support unit, a part of the power and control circuits of the arms being incorporated into the support unit, the other part being extended in the arms.

Abstract: But interconnection device in a data transmission network where each bus connects multiple modules or stations, characterized by the fact that it comprises electronic comparator (51) for receiving the voltages of various buses and delivering a corresponding voltage to the extreme voltage of various input voltages. A correction device (52) applies a slight deviation to the extreme voltage and a distribution circuit (53) provides the corrected voltage to various buses (1 to 4).

Abstract: The invention concerns a crankcase or cylinder block for an internal combustion engine of any type, for example, of the V or in-line cylinder type. The upper half of the crankcase comprises internal conduits which connect the upper part of the crankcase with the lower compartments separating the crankshaft bearings, these conduits making possible the exhaust of crankcase gases and the recycling of the engine oil and opening into a chamber of a flat shape, with said chamber and said internal conduits forming an integral as-cast system. The invention applies in particular to the automotive industry.

Abstract: A device including a comparator (3) each input of which receives signals from an information transmission line (1, 2) through a capacitor (4, 5), is characterized in that devices for forced switching (6) are interposed between the information transmission lines (1, 2) and the inputs of the comparator (3), the output of the latter being connected to one input of an OR gate (7) whose other input receives a reinitialization signal from a protocol decoder and whose output is connected directly and through an inverter to the device for forced switching (6) in order to reinitialize the comparator when the latter is blocked in a dominant state following interference.

Abstract: An auxiliary device for handling failures of an actuating system of a linear electric actuator, including an auxiliary drive device which works with a braking device, so that, in case of failure of said actuating system, the auxiliary drive device returns the actuator to its zero position and the braking device maintains this position in opposition to any mechanical action.

Abstract: The modulation the control of a heat engine associated with an automatic transmission having an electronic control unit includes the steps of initiating a shift of the automatic transmission by the electronic control unit and substantially simultaneously with shifting, delivering a torque modulation signal to an engine torque control element of the engine for reducing engine torque during shifting.

Abstract: Device in which some elements perform functions having high priority access characteristics and other elements perform functions having low priority access characteristics, wherein the central information processing unit comprises a microprocessor assembly connected to first protocol control means connected through multiplexing means to first information input/output means connected to low priority access buses to which are connected the elements having low priority access characteristics, and the microprocessor assembly is connected to second protocol control means connected to second information input/output means connected to a high priority access bus to which are connected the elements having high priority access characteristics.

Abstract: Device for steering the rear wheels of a vehicle with four wheel steering comprising an electric drive systems (1), a bolt-nut system (2) and a reduction mechanism (3), bolt (4) is placed between two guide elements (5) and is integral with an interball joint bar (6) by two connecting elements (7), said interball joint bar (6) being parallel to bolt (4); the unit being supported by a central plate (8) which receives two cases placed on both sides of said plate (8) to which they are attached so as to have a closed unit, interball joint bar (6) passing through said central plate (8).

Abstract: This interface includes three comparators, the inputs of the first comparator being connected to the two transmission lines, one of the inputs of the second comparator being connected to one of the transmission lines and the other input of this comparator being connected to a bias voltage generator, one of the inputs of the third comparator being connected to the other transmission line and the other input of this comparator being connected to the bias voltage generator. The outputs of the comparators are connected to inputs of a multiplexer whose output is connected to the remainder of the circuits of the station, and the control inputs of the multiplexer are connected to the output of defect detecting means for detecting defects of one of the transmission lines so that the transmission lines control the multiplexer in such manner that the multiplexer selects the output of one of the comparators as a function of the state of the transmission lines.

Abstract: Process of analysis of surfaces by luminescent discharge spectrometry. The current used for the creation of the discharge between the anode (3) and the cathode (20) is a high-frequency current arriving on the nonconductive sample (21) to be analyzed and being propagated there by skin effect. Application is to the determination of the quality of surface coatings.

Abstract: A device for the management of a variable, particularly of a pressure relative to an electrohydraulic control of an automatic transmission. The device includes a control element associated with a second control element which generates the variable. The variable is processed by a sensor to give a measurement which is compared with a set point. The possible error .epsilon. is processed by a controller of the proportional-plus-integral-plus-derivative type which acts on the control element. The management device is provided with a table which generates a value based on the set point. This value is added to the value given by the controller and by the set point to act on the control element by way of a converter. The table is updated continuously during the stabilized phases of the variable with a correction that must be made so that the variable corresponds to the set point. The management device has a comparable operation in both the closed loop and open loop after a certain self-learning time.

Abstract: For precisely positioning a vehicle body relative to robots which spot weld the vehicle body, the vehicle body is mounted on a lower tool which is rigidly connected to front and rear upper tools which are selected from a tool magazine as a function of the geometry of the vehicle body. All of the tools are rigidly connected to one another to form a rigid annular structure surrouding the body and alone capable of positioning the body.

Abstract: Pressure-generating device for braking circuits of motor vehicles of the type having electric motors for controlling a device for generating braking pressure. Electric motors (15), associated with each wheel (1, 1', 2, 2') or pair of wheels (1,1'-2,2') of the same axle, drive positive displacement pumps (16) generating the braking pressure for cylinders (7) of brakes (3 to 6).

Abstract: Device for microwave elimination of particles contained in the exhaust gases of diesel engines in which a microwave (.lambda.) source (6) and a conductor (5) of the electromagnetic field generated by the source is joined with a resonator (2 or 3) mounted on an element of the pipe (12) for the exhaust gases which contains an insert, characterized by the fact that the insert consists of a filter (13) whose upstream and downstream ends are offset toward the inside of the cavity defined by the resonator and delimit two chambers (14, 15) in which conductors (4) of the electromagnetic field come out, respectively.

Abstract: A steering mechanism with variable gear reduction controlled by the speed of the vehicle of the type is disclosed which includes an electric motor for driving an element for adjusting the gear reduction ratio and whose power supply is controlled by the speed of the vehicle, characterized by the fact that the steering column includes an input shaft (1) and output shaft (2) to which are rigidly connected input pinions (4) and output pinions (5) meshed with planet pinions (6, 8-7, 9) of a planet carrier (10) which extends axially by a hub (11) placed concentrically to one of the shafts (1, 2) on which is mounted an element (12) for driving and regulating the gear reduction ratio actuated by a variable speed electric motor (13).

Abstract: The invention relates to a device of verification of the wiring of ignition performance module (2) of an electronic injection-ignition system for an internal combustion engine. It comprises a so-called test line (9) connected between module (2) and computer (1) of injection-ignition. Thanks to this device, a process of verification of the wiring is established having to detect successively the presence of an open circuit or a short circuit between ignition performance module (2) and its control circuit (8).

Abstract: This device for the differential transmission of items of information between at least two elements (1, 2) of an automobile vehicle, each of which elements comprises transmitting means (13, 16) and information receiving means (14, 17) interconnected by two information transmitting lines (11, 12), further comprises means (14a, 17a, 14b, 17b) for processing signals circulating in the information transmitting lines whereby to permit an operation of the device in a degraded mode from signals circulating in one of the information transmitting lines (11, 12).

Abstract: Electromagnetic injector of the pressure-time type, which comprises a toric electromagnet coil (2, 12) of the axisymmetric solid type, housed in a magnetic circuit support (13), as well as a mobile element consisting of a plane plate (3) solid with a liner (4) which moves a suspended needle (18) forming with a seat (45, 19), reverse clack (41) of the injector, the needle being kept at rest by return spring (20).