Abstract: Device for determining an error induced by a high-pass filter in a signal, including a unit (3) for calculating the error according to the formula: E(t)=Ve(t)?Vs(t)=2·?·Fc·??=t0t(Vs(?)? Vs(?))·d?+E(t0) with: E(t) the value of the error induced by the high-pass filter, as a function of the time variable t, ?the trigonometric constant, Fc the cutoff frequency of the high-pass filter, t0 the initial instant, ?integration variable, Ve the signal input to the high-pass filter, Vs the signal output by the high-pass filter, Vs the mean value of the signal Vs. A method of correcting the error induced is also presented and applicable to the error correction of a piezoelectric pressure sensor.

Abstract: Device for measuring cylinder pressure of an internal combustion engine includes a pressure sensor that includes a piezoelectric element associated with a capacitive element, and an output generating a first voltage representative of the cylinder pressure. A filtering module of the device filters parasitic low-frequency voltages and generates a second voltage free of these parasitic voltages. A control module delivers a control signal that is dependent on a switching parameter correlated with a stroke. A switching module, in response to the control signal, disconnects the input of the filtering module from the output of the pressure sensor during the first stroke and connects the input of the filtering module to the output of the pressure sensor during the second stroke. The first stroke corresponds to a compression stroke or to a combustion-expansion stroke, and the second stroke corresponds to an intake stroke or to an exhaust stroke.

Abstract: Device for determining an error induced by a high-pass filter in a signal, including a unit (3) for calculating the error according to the formula: E(t)=Ve(t)?Vs(t)=2·?·Fc·??=t0t(Vs(?)? Vs(?))·d?+E(t0) with: E(t) the value of the error induced by the high-pass filter, as a function of the time variable t, ? the trigonometric constant, Fc the cutoff frequency of the high-pass filter, t0 the initial instant, ? integration variable, Ve the signal input to the high-pass filter, Vs the signal output by the high-pass filter, Vs the mean value of the signal Vs. A method of correcting the error induced is also presented and applicable to the error correction of a piezoelectric pressure sensor.

Abstract: An integrated sensor includes: i) a voltage regulator coupled with a mechanical ground and delivering a regulated voltage based on a primary power supply voltage referencing an electrical ground; ii) a high-impedance sensitive element powered by the primary power supply, electrically coupled to the mechanical ground and delivering an electrical quantity representative of a physical quantity; iii) an amplification module powered by the regulated voltage and including a first input receiving an analog reference dependent on the regulated voltage and a second input receiving the electrical quantity, and designed to deliver a first output voltage representing the amplified measurement voltage; and iv) a differential amplifier powered by the primary power supply voltage, referencing the electrical ground and including first and a second inputs receiving the analog reference and the first output voltage, respectively, and delivering a second output voltage representing the first amplified output voltage referenced

Abstract: A device for measuring the cylinder pressure of an internal combustion engine, the operation of which comprises a plurality of successive cycles, each cycle being broken down into at least first and second strokes, the measuring device comprising at least one pressure sensor (1) consisting of at least one piezoelectric element associated with a capacitive element, and an output (10) generating a first voltage (V1) representative of a pressure (F) applied to the piezoelectric element, the device further comprising: a filtering module (2) comprising at least one input (20) and one output (21), capable of filtering parasitic low-frequency voltages present at its input (20), and of generating on its output (21) a second voltage (V2) free of these parasitic low-frequency voltages; a control module (3) capable of delivering a control signal (Scom) that is dependent on a switching parameter correlated with a stroke, among the first and second strokes, in which the engine is operating; a switching module (4), in resp

Abstract: An integrated sensor includes: i) a voltage regulator coupled with a mechanical ground and delivering a regulated voltage based on a primary power supply voltage referencing an electrical ground; ii) a high-impedance sensitive element powered by the primary power supply, electrically coupled to the mechanical ground and delivering an electrical quantity representative of a physical quantity; iii) an amplification module powered by the regulated voltage and including a first input receiving an analog reference dependent on the regulated voltage and a second input receiving the electrical quantity, and designed to deliver a first output voltage representing the amplified measurement voltage; and iv) a differential amplifier powered by the primary power supply voltage, referencing the electrical ground and including first and a second inputs receiving the analog reference and the first output voltage, respectively, and delivering a second output voltage representing the first amplified output voltage referenced

Abstract: An application-specific integrated circuit includes a first analog stage having a first filtering means responsible for carrying out a filtering of the high-pass type on an input signal so as to deliver an intermediate signal, and a second digital stage having a second filtering means capable of introducing various first time constants depending on combinations of coefficient values and responsible for correcting any distortion potentially present in the intermediate signal, wherein the first filtering means includes an assembly of electronic components configured in parallel and/or in series and capable of introducing various second time constants depending on their combination.

Abstract: An application-specific integrated circuit (CS) comprises a first analog stage (E1), comprising first filtering means (C11-C2M, R11-R2P) responsible for carrying out a filtering of the high-pass type on an input signal (SE) so as to deliver an intermediate signal (SI), and a second digital stage (E2), comprising second filtering means (M2) capable of introducing various first time constants depending on combinations of coefficient values and responsible for correcting any distortion potentially present in the intermediate signal (SI). The first filtering means comprise an assembly of electronic components configured in parallel and/or in series and capable of introducing various second time constants depending on their combination.

Abstract: The device for measuring the intensity (1) of a strong current passing through a wire (1) comprises a magnetic sensor (2) in the form of a loop surrounding the wire (1), and a turn (3) of conductive material surrounding the wire (1) conducting a high-frequency counter-current, the intensity of which is adjusted to cancel the magnetic field (H) is characterized in that the turn (3) of conductive material is in short circuit and surrounds the magnetic sensor (2).

Abstract: The device for measuring the intensity (1) of a strong current passing through a wire (1) comprises a magnetic sensor (2) in the form of a loop surrounding the wire (1), and a turn (3) of conductive material surrounding the wire (1) conducting a high-frequency counter-current, the intensity of which is adjusted to cancel the magnetic field (H) is characterized in that the turn (3) of conductive material is in short circuit and surrounds the magnetic sensor (2).

Abstract: According to this process, a) it defines, for each phase for the combustion of the fuel/air mixture, an observation window delimited by predetermined angular positions of the crankshaft, b) it measures in each window a series of time gaps (.DELTA.T.sub.i), dividing the movements of the crankshaft into predetermined angular positions, c) it calculates two linear combinations (.SIGMA.a.sub.i .DELTA.T.sub.i) and (.SIGMA.b.sub.i .DELTA.T.sub.i), of the time gaps (.DELTA.T.sub.i), each of the coefficients (a.sub.i) and (b.sub.i) of these combinations being chosen so as to amplify the variations, in observation window, of the alternating component of the angular speed (.OMEGA..sub.1, .OMEGA..sub.2) of the crankshaft during the measurement of the corresponding time gap (.DELTA.T.sub.i), in first and second operating modes of the engine, respectively, for which the alternating components observed (.OMEGA..sub.0, .OMEGA..sub.90) are phase-shifted relative to one another by a predetermined angle (.PHI..sub.

Abstract: The device comprises (a) an external impedance (R.sub.ext) connected up between a voltage source (E) for powering the circuit and a pin (4) connected to a high-impedance input (3) of the logic part of this circuit, (b) a branch of the analogue circuit, connected up between this pin (4) and the earth of the circuit and, (c) a circuit (5) transmitting logic signals and connected up to this pin (4) by a logic output (6) which offers a high impedance in one of its two logic states, a specified current being established in the said pin when the said output is in the high-impedance state.Application to the limitation, regulation, directing or measuring of the current in a load outside the integrated circuit.

Abstract: The circuit according to the invention comprises a hysteresis comparator 9 connected to a transistor 2 controlling the current flowing in an inductive load 1. The voltage taken across the terminals of a measurement resistor 3 is compared with a reference voltage established by a source 6. According to the invention, a feedback loop 10 establishes a proportional action of the transistor 2 on the current in the load 1 when the voltage at S exceeds a predetermined threshold. In this way an oscillation is obtained between two values on either side of a nominal value, these two values being associated with the thresholds of the hysteresis comparator. Application to the production of an integrated circuit for the control of the ignition coil of an internal combustion engine.

Abstract: The circuit comprises a comparator 1 fed by a quasi-sinusoidal signal delivered by a source 2 for converting the positive alternations of the signal into pulses acceptable by digital computing means. According to the invention, the circuit comprises a current source 7 selectively connectible to the circuit in order to vary its sensitivity and to thus enable an evaluation of the amplitude of the signal delivered by the source 2. Application to the diagnosis of the operating state of a variable reluctance sensor delivering a quasi-sinusoidal signal representing the speed of rotation of a shaft fitted in a motor vehicle.