Abstract: The invention relates to a device for supplying electricity at overvoltage in an automobile.Automobile circuits comprise a main circuit (1) and an auxiliary circuit (2) requiring to be temporarily supplied at overvoltage. The main circuit is normally supplied by a battery (3) fed by an alternator (4) of which the excitation circuit is regulated by a regulator (5). In accordance with the invention, the device includes commutation means (6) controlled from the stator output of the alternator on the auxiliary load (2), the excitation of the alternator (4) following this commutation being taken via the regulator (5) to a sufficient value as a function of the state of the engine (M) for assuring a temporary supply state of the auxiliary circuits (2) at overvoltages and at reduced current.Application to supply of electric circuits of automobiles or the like.

Abstract: A rotor for a small electric motor, useful for example in a vehicle window raising device, has an armature carried by a shaft and having slots in which electrical conductors are wound and connected to a current collector. The shaft has grooves at both ends of the armature to a depth such as to permit the path of the electrical conductors passing between non-consecutive generally opposed slots during winding of the conductors at the bottom of the armature slots to be substantially rectilinear.

Abstract: A coil including a closed magnetic circuit (1), constituted by metal sheets which are stamped and stacked, so as to form a first part (12) which is U-shaped, of which one of the portions (12a) is stamped with a chamfered edge (12b), a second part (13), which is L-shaped, has a portion (13a) stamped with a chamfered edge (13b) such that after an insulating housing (6) containing the primary (4) and secondary (5) windings has been located on the arm (8) and a permanent magnet (2) has been inserted between the chamfers (12b and 13b) the first and second parts (12 and 13) are made rigid, by means of rivets (14, 15) and extensions (9b) of the metal plates (9) constituting a shunt circuit for magnetic flux created by the primary winding (4).

Abstract: This device is intended for the retaining brush lead connections for motor vehicle starters and is in the form of a bridging piece or retainer which includes a longitudinal hole permitting the passage of a tie element, and a groove parallel to this longitudinal hole in which are held the brush lead and a connection between windings. The bottom of this groove is formed with a resiliently deformable lip, and the device has a peripheral ring which is resiliently deformable, the deformation of the lip and of the ring during assembly ensuring effective retention, by pressure, between the brush lead and the connection.

Abstract: An engine ignition advance correction device in which a distributor co-acts with two independent capsules sensitive respectively to variations in pressure at different locations in the engine, the capsules acting on an advance lever pivoted on a fixed part of the distributor and carrying a pair of pivotally mounted advance levers, the capsules acting on the advance lever either successively to provide ignition advance when the depression is sufficient at only one of said locations, or simultaneously to provide ignition advance corresponding to the sum of the maximum advance values effected respectively by the capsules.

Abstract: A motor vehicle battery charging installation includes an alternator/rectifier combination which is controlled by a voltage regulator and is connected to the battery. A warning lamp is connected in series with the collector-emitter of a control transistor across the battery. The voltage at the base of the control transistor is determined by a resistor/capacitor/diode network connected to the rectifier output and to a phase point of the alternator to turn the lamp on whereas the alternator is producing no output. A zener diode is connected to the rectifier output and to an auxiliary input of the regulator to take control should the connection between the alternator and the battery become interrupted. Current flow through this zener diode is detected by a second transistor with its collector-emitter parallel with the first-mentioned transistor so as overridingly to illuminate the lamp in the event of the zener diode becoming conductive.

Abstract: An electronic ignition control device includes a voltage step up coil with its primary winding in series with an electronic contact breaker. The contact breaker is directly controlled by a first monostable circuit which is connected to be triggered by signals from an ignition signal generator. A comparator receiver a voltage signal from a coil current transducer and compares this with a fixed voltage level, producing a square wave of duration dependent on the excess of the voltage signal above the fixed voltage level. An integrator integrates the output of the comparator and provides a pulse duration control signal to the first monostable. A second monostable triggered by the generator also produces a square of predetermined duration. A current limiting circuit is connected to limit current in the primary winding. The first and second monostable circuits and the current limiting circuit all have their outputs connected to an OR gate which controls the primary current.

Abstract: Method and apparatus for providing ignition advance in an internal combustion engine in which a voltage generator supplies a voltage V.sub.1 applied to a first terminal of a pulse generator, and a tachometer generator supplies a voltage V.sub.2 applied to a second terminal of the pulse generator. The pulse generator in turn produces a pulse which controls the ignition upon the coincidence of voltage V.sub.1 with V.sub.2. A third signal V.sub.3, dependent on at least one of the parameters of operation of the engine, such as temperature or vacuum, is added to voltage V.sub.1 so that when V.sub.1 plus V.sub.3 coincides with V.sub.2, an ignition pulse is produced that triggers the ignition spark at that instant.

Abstract: A depression sensor for an electronic ignition advance device for an internal combustion engine especially intended for use in a motor vehicle, the sensor being of the kind having a membrane which in use is deformable in response to the value of said depression, wherein the sensor comprises resistive means having an ohmic value which varies in accordance with the force applied to said means, and an electronic control circuit controlled by said resistive means so that variations in the value of said depression applied to the membrane will vary the force applied to the resistive means and consequently will vary an output voltage of said electronic control circuit.

Abstract: A device for protecting an ignition device, particularly for motor vehicles, equipped with an internal combustion engine, in which a zener diode controls, by means of at least two transistors the placing in short-circuit of a resistor connected in series with the primary winding of an ignition coil and a control device in such a manner that when the supply voltage of the device exceeds a determined value, the resistor acts in series with the coil, which avoids damage to the ignition device.

Abstract: An electronic ignition circuit utilizing a magnetic pick-up winding has both ends of the pick-up winding connected by biasing resistor networks to the output terminal of the input stage of the circuit at which a positive going pulse appears when a negative going signal is induced in the pick-up winding. One end of the winding is connected by a diode to the base of a first transistor which controls a second transistor through a capacitor/resistor chain/diode series combination connected between the collector of the first transistor and said one end of the winding. The arrangement ensures that a spark can be produced even at low speed when a small signal is induced in the winding at the instant when ignition is required.

Abstract: An ignition distributor for use in an internal combustion engine, the distributor having in known manner a fixed contact and a movable contact wherein there is provided a support for the fixed contact having a housing which contains a nut threadably engaged with an adjustment screw whereby angular divergence is permitted between the screw and said support for the fixed contact when the screw is rotated.

Abstract: An ignition system and a method of ignition for an internal combustion engine in which an element is rotated in association with a position detector to provide a reference signal varying in duration with engine speed. Impulses of constant frequency are produced by a generator and the impulses appearing during the duration of the reference signal are counted and coded. A further generator produces pulses as a function of induction depression and these are also counted and coded, and this coded value is corrected as a function of engine speed. The first coded value and the corrected coded value are compared and, when these coincide, an ignition spark is produced.