| Patent application number | Description | Published |
|---|
| 20080315864 | Out-Of-Line Measurement of a Current Flowing Through a Load - A load measuring circuit including a cable including first and second conductors and a shielding. The conductors are connected by a first end thereof to a load, the shielding is not connected to a ground at the end, and the conductors are connected to a generator by the second end thereof. A transformer includes a first winding connected to a conductor on the second end of the cable, a second winding is connected between a ground and the shielding on the second end of the cable, and a third winding is connected to a current measuring member. | 12-25-2008 |
| 20090091212 | DEVICE AND METHOD FOR DRIVING AN ULTRASOUND PIEZOELECTRIC ACTUATOR - A device for driving ultrasound piezoelectric actuators, on the basis of a DC voltage. The device includes an impedance matching branch mounted in parallel with the actuators and including a capacitor in series with a selection switch, which is closed and opened, at the same time as the selection switch of the actuator to be excited, so that the voltage across the terminals of the matching capacitor and the voltage across the terminals of the selected actuator are almost zero before the start and after the end of the injection. A method of controlling the matching switch makes it possible to benefit from the capacitive charge during the pulse train causing the injection, while circumventing abrupt discharges at the start of the train. Such a device and method may find application to the engines of motor vehicles, as one example. | 04-09-2009 |
| 20090153142 | METHOD FOR MEASURING AN IONIZATION CURRENT OF A SPARK PLUG OF THE TYPE WITH RESONANT STRUCTURE AND CORRESPONDING DEVICE - A device for measuring an ionization current of a spark plug of a type with a resonant structure, including a motor vehicle ignition system, the spark plug being coupled to a generator including a regulating capacitor. The generator includes a polarizer that polarizes the spark plug, connected between the generator and the spark plug, and a device that measures ionization current of the spark plug, connected between the regulating capacitor and ground. | 06-18-2009 |
| 20090165764 | OPTIMIZATION OF THE EXCITATION FREQUENCY OF A RESONATOR - A device for controlling a power supply of a radio frequency ignition of a combustion engine, including: an interface that receives measurement signals of operating parameters of a combustion engine; an interface that outputs a control signal; a module that stores relationships between measurement signals and the frequency of a control signal to be generated; a module that determines the frequency of a control signal to be generated on the basis of measurement signals received on the reception interface and of the relationships stored; and a module that applies the control signal at the determined frequency. | 07-02-2009 |
| 20100033116 | CONTROL DEVICE FOR AN ULTRASONIC PIEZOELECTRIC ACTUATOR - A control device for an ultrasonic piezoelectric actuator including a first stage supplied by a DC voltage source and including a mechanism forming a second DC voltage above that voltage delivered by the DC voltage source, and a second stage including a mechanism amplifying the second voltage and chopping the voltage obtained by excitation of the actuator with the chopped voltage, under control of a computer. The amplifying mechanism includes an inductor in electrical resonance with the piezoelectric actuator. The inductor is connected to the first stage so as to constitute, during formation of the second voltage, a secondary winding of a transformer forming part of a flyback voltage converter introduced into the first stage to develop the second voltage. The control device may find application to control of a fuel injector in an internal combustion engine. | 02-11-2010 |
| 20100194279 | CONTROL OF A PLURALITY OF PLUG COILS VIA A SINGLE POWER STAGE - A radiofrequency plasma generating device including: a supply circuit including a switch controlled by a control signal for applying a voltage on an output of the control circuit at a control frequency; at least two plasma-generating circuits connected in parallel at the output of the supply circuits, each circuit having its own resonance frequency and being capable of generating plasma when a high voltage level is applied to the output of the supply circuit at a frequency substantially equal to the resonance frequency of the plasma generation circuit; and a supply control device determining the control frequency from the resonance frequencies of the plasma generation circuits to selectively control each circuit according to the control frequency used. | 08-05-2010 |
| 20100251995 | OPTIMIZED GENERATION OF A RADIOFREQUENCY IGNITION SPARK - A method for controlling a radio-frequency plasma generator including a supply circuit with a switch controlled by at least one control pulse train, for applying an intermediate voltage at a control frequency on an output to which is connected a resonator for generating a spark between two electrodes when a high voltage level is applied to the output. The method receives first and second measurement signals respectively representative of the operation of a combustion engine and of the type of spark generated; and real-time adjusts, based on the received measurement signals, at least one parameter selected from at least the intermediate voltage level, the control frequency, and the duration of the control train, to promote branching of the spark generated. | 10-07-2010 |
| 20100313841 | CONTROL OF A PLURALITY OF PLUG COILS VIA A SINGLE POWER STAGE - A plasma generating device including: a supply circuit including a switch controlled by a control signal for applying an intermediate voltage on an output of the control circuit at a frequency defined by the control signal; a plurality of plasma-generating plug coils arranged in parallel on the output via connectors, each connector being adapted to be removably connected to a corresponding plug coil and including a mechanism adapted to offset the resonance frequency of the plug coil so that each plug coil has a distinct resonance frequency; a control device of the supply circuit, that determines the control frequency from the resonance frequencies of the plug coils to selectively control the plug coils according to the control frequency used. | 12-16-2010 |
