Continental Automotive France

Siemens Automotive S.a.

Siemens Vdo Automotive Corporation

Michel Suquet

Alain Ramond

Simon-Didier Venzal

Alain Rossignol

Device for determining an error induced by a high-pass filter in a signal, including a unit () for calculating the error according to the formula:()=()&#x2212;()=&#xb7;&#x222b;((&#x3b1;)&#x2212;(&#x3b1;))()with: E(t) the value of the error induced by the high-pass filter, as a function of the time variable t, &#x3a0;the trigonometric constant, Fthe cutoff frequency of the high-pass filter, tthe initial instant, &#x3b1;integration variable, Vthe signal input to the high-pass filter, Vthe signal output by the high-pass filter,the mean value of the signal V. A method of correcting the error induced is also presented and applicable to the error correction of a piezoelectric pressure sensor.

Device for determining an error induced by a high-pass filter and associated error correction method

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.

Pressure measuring device and corresponding method

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 to the electrical ground.

Integrated sensor with capacitive coupling rejection to the mechanical ground

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.

Application-specific integrated circuit with automatic time-constant matching

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

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Villeneuve Tolosane, France

Michel Suquet