Abstract: The invention mainly relates to a power transmission device (1) between an internal combustion engine (2) and vehicle wheels (3) consisting of a pair of electrical machines (4.1, 4.2) and a mechanical assembly (90), wherein said assembly (90) comprises at least two epicycloidal trains (5, 9) each of which is provided with three mutually engageable elements. According to said invention, a switching device (23.1) comprises means (23, 28) for simultaneously connecting the machine shaft (11) to two other elements (11.1, 11.2) of the mechanical assembly (90) during switching between two operating modes of the transmission device (1).

Abstract: A power transmission device (1) between a shaft (2) of a thermal engine (3) and a shaft (4) of wheels comprises a first and a second electric machine (6, 7), as well as a mechanical assembly (9). In a first mode of operation, the first machine (6) is connected to an element (27) of the assembly (9) and the second machine (7) is connected to a shaft (4) of the wheels (5). In a second mode of operation, the first machine (6) is connected to the element (27) of the assembly (9) and the second machine (7) is connected to another element (26) of the ensemble (9). In a third mode of operation, the shaft (10) of the first machine (6) is connected to the shaft (4) of the wheels (5) and the shaft (11) of the second machine (7) is connected to the other element (26).

Abstract: The present invention concerns essentially a power transmission device (1) between a shaft (2) of a thermal engine (3) and a shaft (4) of wheels (5). This transmission device (1) comprises a first and a second electric machine (6, 7), as well as a mechanical assembly (9). In a first mode of operation, the first machine (6) is connected to an element (27) of the assembly (9) and the second machine (7) is connected to a shaft (4) of the wheels (5). In a second mode of operation, the first machine (6) is connected to the element (27) of the assembly (9) and the second machine (7) is connected to another element (26) of the ensemble (9). In a third mode of operation, the shaft (10) of the first machine (6) is connected to the shaft (4) of the wheels (5) and the shaft (11) of the second machine (7) is connected to the other element (26).

Abstract: The invention essentially relates to a method of controlling a device (1) for the transmission of power between a shaft (2) of a heat engine (3) and an axle shaft (4). The inventive method involves the use of two electric machines (6, 7), namely a first machine having a rotation speed WA and a torque CA and a second machine having a rotation speed WB and a torque CB. A coupling device (11) comprises an electric controller (27) which produces set point signals RefCA and RefCB for controlling the inverters (12, 13). According to the invention, in order to produce set point signals RefCA and RefCB, an electric reference signal RefELEC corresponding to CA*WA+CB*WB and a mechanical reference signal RefMECA corresponding to CA*WB?CB*W A are applied at the inputs of the control device.

Abstract: The invention concerns a device for power transmission, in a vehicle, between a heat engine shaft and a wheel shaft (5). The invention concerns essentially a device (1) for power transmission between a shaft (2) of a heat engine (3) and a shaft (4) of wheels (5). A mechanical assembly (10) mutually connects the shaft (4) of wheels (5), the shaft (2) of the engine (3) and the shafts (8, 9) of two electrical machines (6, 7). This mechanical assembly (10) comprises at least two mutually connected planetary gearsets (49, 50). The invention is characterized in that the two planetary gearsets (49, 50) have a common planet pinion cage (57) and mutually meshing planet pinions (53-56). In another embodiment, the planet pinions (53, 56) of the two gearsets (49, 50) are mutually integral and coaxial.

Abstract: The invention mainly relates to a power transmission device (1) between an internal combustion engine (2) and vehicle wheels (3) consisting of a pair of electrical machines (4.1, 4.2) and a mechanical assembly (90), wherein said assembly (90) comprises at least two epicycloidal trains (5, 9) each of which is provided with three mutually engageable elements. According to said invention, a switching device (23.1) comprises means (23, 28) for simultaneously connecting the machine shaft (11) to two other elements (11.1, 11.2) of the mechanical assembly (90) during switching between two operating modes of the transmission device (1).

Abstract: The invention relates to a drive train comprising a first electrical machine (15) having a first stator and a first rotor, a propulsion shaft (19) driven in rotation by the first rotor, energy storage means (27, 35), and electrical energy distribution means (26) electrically connecting the first stator to the energy storage means (27, 35). The energy storage means (27, 35) comprise a second electrical machine (27) having a second rotor and a second stator, connected firstly electrically to the energy distribution means (26), and secondly mechanically by a shaft (37) to a flywheel (35) of small dimensions. The invention also provides a method of controlling such a drive train and applies to propelling hybrid motor vehicles.

Abstract: The invention concerns a power transmission device between a heat engine (1) and the wheels (2) of a motor vehicle, said device comprising two independent electric machines (3, 4), at least two planetary gear trains (5, 15, 25, 35; 6, 16, 26, 36) connecting the heat engine and the electric machines with one another and to the vehicle wheels, a mechanical switching device (7) shifting the transmission device from one operating mode to another, each transmission mode corresponding to a different range of transmission ratios, the switching device enabling to connect one of the electric machines directly to the vehicle wheels and a control device monitoring the heat engine (1), the two electric machines (3,4) and the mechanical switching device (7), so that the operating points of the heat engine and of the electric machines correspond to the minimum instantaneous consumption and enable to provide the required power to the wheels.

Abstract: A system is disclosed for powering a motor vehicle using a heat engine and an electric machine. The vehicle includes a supercapacitor which stores unused energy from the heat engine. When the vehicle speed stabilizes, energy is stored in the supercapacitor. The heat engine is shut down and the energy from the supercapacitor is then used to power the electric machine which supplies power to the wheels.

Abstract: The invention concerns a system for electrically regulating a power transmission device between the heat engine and a pair of electrical machines and the drive wheels of a motor vehicle, the heat engine being connected to the two electrical machines via a mechanical assembly, while an electrical connection device located between the two electrical machines provides a direct passage for power from one machine to the other, the connection transferring electric power between the two electrical machines being carried out via two static converters connected to a bus whereof the two lines are connected to a bus whereof the two lines are connected by a capacitor. The invention is connected by a capacitor.

Abstract: The invention concerns a power transmission device between a heat engine (1) and the wheels (2) of a motor vehicle, said device comprising two independent electric machines (3, 4), at least two planetary gear trains (5, 15, 25, 35; 6, 16, 26, 36) connecting the heat engine and the electric machines with one another and to the vehicle wheels, a mechanical switching device (7) shifting the transmission device from one operating mode to another each transmission mode corresponding to a different range of transmission ratios, the switching device enabling to connect one of the electric machines directly to the vehicle wheels and a control device monitoring the heat engine (1), the two electric machines (3,4) and the mechanical switching device (7), so that the operating points of the heat engine and of the electric machines correspond to the minimum instantaneous consumption and enable to provide the required power to the wheels.

Abstract: A conversion apparatus having transistors, comprising means for inverting a DC voltage in order to obtain an AC voltage, means for filtering the AC voltage, including at least one parallel inductor Lp, the device being capable of operating above a resonant frequency Fp. The conversion apparatus comprises means for predicting a zero crossing of the instantaneous current I1p in the parallel inductor Lp, and means for causing a transistor of the device to switch if a zero crossing of the current I1p is predicted.

Abstract: Method and apparatus for regulating a converter having transistors, in which the value of a number N1 of state variables is measured and stored, then action is carried out on a number N2 of control variables. N1 being greater than N2, the value of the control variables is calculated, at a given instant, for a number P of periods such that the product of N2 multiplied by P is greater than or equal to N1.

Abstract: Disclosed is a device to obtain a DC voltage V.sub.p that is adjustable in a wide range of values. To a rectifying and filtering circuit, there are applied AC pulses. The quantity of electricity of these AC pulses is constant for each pulse, and their frequency F varies as a function of the voltage V.sub.p to be obtained. To this effect, a DC/AC converter of the hyporesonant type is used. The device can be used for providing bias for a focusing element of an X-ray tube.

Abstract: Disclosed is a device that can be used to obtain voltages for the biasing of the electrodes used to deflect the electron beam emitted by a cathode of an X-ray tube. Four DC voltages .+-.V.sub.1 and .+-.V.sub.2 are generated and applied to a mixing circuit in which they are added by using diodes to floating reference pulse voltages .+-.V.sub.3 so as to obtain voltages VS.sub.1, VS.sub.2, VS'.sub.1, VS'.sub.2 for the charging of capacitors such that:VS.sub.1 =V.sub.3 -V.sub.1 and VS.sub.2 =-V.sub.3 +V.sub.2VS'.sub.1 =-VS.sub.3 +V.sub.2 and VS'.sub.2 =V.sub.3 -V.sub.

Abstract: The disclosure relates to devices for supplying current to X-ray tube cathode filaments. The filament of a cathode is supplied with high-frequency current pulses given by a hyporesonant type DC/AC converter, the transistors of which are controlled by a regulation circuit. This regulation circuit carries out a high-frequency regulation.

Abstract: A direct-current high voltage obtained by rippling, stepping-up and rectification of a direct-current low voltage is regulated in such a manner as to ensure that the maximum value of direct-current high voltage attains a predetermined peak value at each ripple pulse of the inverter. To this end, a following pulse of the inverter is produced as soon as the high voltage of the direct-current high-voltage signal has become lower than the predetermined peak value reduced by the measurement of a variation in said direct-current high voltage during a preceding pulse.