Abstract: A method and system is provided for monitoring a person likely to be in a potentially high-risk area. The method is characterized in that it comprises a step of activating a radio frequency communication apparatus, referred to as a beacon; a step of broadcasting a signal carrying piece of information about a risk occurring in the potentially high-risk area and defines the type of risk and a level of seriousness thereof; a step of receiving a signal carrying the piece of risk information by a badge worn by the person; a step of transmitting by the badge, an identifier of the person to the beacon; a step for determining, by the badge, a piece of information disclosing the person at risk; and a step of transmitting the of disclosing information to a remote apparatus responsible for centralized risk management.

Abstract: A method for determining a value representative of the pressure in a combustion chamber of an internal combustion engine, includes the following steps: i. measuring the vibration level (2) of the internal combustion engine with an accelerometer placed on the engine block of the internal combustion engine, ii. integrating a value from the signal (2) provided by the accelerometer in a window (t1, t2) delimited as a function of the position of the crankshaft of the internal combustion engine, iii. supplying the result of the integration (A1) as a value representative of the pressure, characterized in that the signal (2) provided by the accelerometer in step “i” is integrated while being raised to a power greater than 1 by a predetermined exponent.

Abstract: Method of detecting a misfire in an internal combustion engine provided with at least two cylinders and a crankshaft, includes: a. producing a measurement signal linked to the crankshaft travel time by supplying a succession of instantaneous values each corresponding to the difference between two successive segment times, each of these segment times corresponding to the time interval separating two characteristic instants of the movement of the pistons in two successive cylinders in the firing order, b. comparing the value of the measurement signal with a threshold value, and c. generating a signal representative of a misfire if the value of the measurement signal crosses the threshold value, the measurement signal having, for each cylinder, an average value that is offset relative to a reference average value, a step of reducing, for each cylinder, this offset, is performed by a high-pass filtering operation on the measurement signal.

Abstract: A device (1) for determining the position of an internal combustion engine, includes an incremental-type sensor (2) having a rotary part (8) which is connected to the rotary body, and a fixed part (6) which is provided with first elements for detecting the rotation of an increment between the mobile part (8) and the fixed part (6), second elements for detecting the direction of rotation between the mobile part (8) and the fixed part (6), and analysis elements which are connected to the first elements and the second elements and are used to determine the angular position of the rotary body in relation to the reference position. The device also includes engine controlling elements (4) which are connected to the analysis elements (12) of the sensor (2), and the sensor (2) is permanently electrically (34) fed in the device.

Abstract: Method for determining the timing of an indirect injection internal combustion engine, in which the following steps are performed: use is made of a first sensor (2) including a target (6) connected to the crankshaft and having a plurality of marks (8), use is made of a second sensor (12) including a target (16) connected to the camshaft and having: a plurality of teeth (D1, D2, D3), a plurality of gaps (C1, C2, C3), and a plurality of fronts (F1, F2, F3, F4, F5, F6) separating the teeth (D1, D2, D3) and the gaps (C1, C2, C3), the engine is turned over from a starting position, the marks (8) on the target (6) of the first sensor (2) are counted, the fronts (F1, F2, F3, F4, F5, F6) on the target of the second sensor are detected, this is used to deduce the engine timing.

Abstract: The invention relates to a method for determining the energy (KNKE) of the knock of an internal combustion engine, using an analog signal supplied by a sensor fixed to the engine. The inventive method includes the following steps: a) the analog signal is shaped, b) the analog signal is converted into a sequence of digital samples, c) the signal is subjected to digital filtering, and d) the signal is adjusted and e) integrated. According to the method: i) the shaping of the analog signal includes combining the signal with a continuous component (Vcnf) adapted to render the shaped signal a positive signal or a zero signal, and ii) the digital filtering is carried out by a band-pass filter with an infinite impulse response, the transfer function thereof including a zero for the zero frequencies.

Abstract: According to methods known in prior art, a parameter which depends on the acceleration of the internal combustion engine is determined by means of a monitoring and analyzing system and is compared with a threshold value. According to the inventive method, the spread of said acceleration-dependent parameter is used for adjusting the threshold value to changes in the smoothness of running of the internal combustion engine.

Abstract: Method for processing a sensor signal of a knocking sensor for an internal combustion engine, having the following steps: a time window is defined for the evaluation of the sensor signal as a function of the operating state and/or the operating behavior of the internal combustion engine, a plurality of sampled values of the sensor signal are sampled within the predefined time window with a predefined sampling frequency, and an output signal which represents the knocking behavior of the internal combustion engine is determined from the sampled values, the Fourier transform of the sampled values being calculated in order to determine the output signal.

Abstract: According to this method, a) a series of sparks is emitted into an engine cylinder (1), filled with an air/fuel mixture to be ignited, at predetermined successive instants, b) one of the sparks that initiates the ignition of the mixture is identified, c) the difference separating the instant of emission of the spark from a predetermined ignition instant able to ensure that the engine supplies a predetermined mechanical power is evaluated, and d) the instant of opening of the fuel injector (3) is corrected as a function of the difference, so as to initiate subsequent ignitions of the air/fuel mixture in the cylinder (1) at the predetermined instant.

Abstract: According to this method, a) a series of sparks is emitted into an engine cylinder (1), filled with an air/fuel mixture to be ignited, at predetermined successive instants, b) one of said sparks that initiates the ignition of said mixture is identified, c) the difference separating the instant of emission of said spark from a predetermined ignition instant able to ensure that said engine supplies a predetermined mechanical power is evaluated, and d) the instant of opening of said fuel injector (3) is corrected as a function of said difference, so as to initiate subsequent ignitions of the air/fuel mixture in said cylinder (1) at said predetermined instant.

Abstract: The invention concerns a temperature protection method for a motor vehicle engine exhaust pipe, comprising steps which consist in determining an ignition advance angle among several possible values including a stall speed angle, based on a predetermined logic and operational parameters of the engine.

Abstract: A process for determining an operating parameter of an internal combustion engine as a function of three control parameters (N, P, &lgr;) of this motor, comprises: a) establishing a first map of the operating parameter as a function of two control parameters, the third control parameter being fixed at a first value; b) establishing a second map of the operating parameter as a function of the two same control parameters, the third control parameter being fixed at a second value; c) establishing a relationship between the operating parameter and the third control parameter over all the range of variation of this parameter at at least one specific operating point; and d) using this relationship to determine the operating parameter as a function of the three control parameters at all points of operation of the motor.

Abstract: Method for processing a sensor signal of a knocking sensor for an internal combustion engine, having the following steps: a time window is defined for the evaluation of the sensor signal as a function of the operating state and/or the operating behavior of the internal combustion engine, a plurality of sampled values of the sensor signal are sampled within the predefined time window with a predefined sampling frequency, and an output signal which represents the knocking behavior of the internal combustion engine is determined from the sampled values, the Fourier transform of the sampled values being calculated in order to determine the output signal.

Abstract: A method of detecting misfires in an internal combustion engine based on the crankshaft speed, in the case of which cylinder segment times are measured and differences between consecutive segment times are analyzed by means of a prescribed algorithm and where one cylinder group is switched off and the analysis is carried out for the cylinder group continuing to be operated.

Abstract: An optical velocimeter probe a device to illuminate a volume of measurement in which there may pass particles, and an optical detector to produce an electrical signal x(t) in response to the passage of a particle in the illuminated volume. It also includes a device to extract information representing the velocity v of particles from the electrical signal, including, in particular, a device to convert the electrical signal x(t) into a complex signal .sub.x (t), an apparatus to set up a self-correlation function r.sub.x (m) of the signal x(t), and a device to estimate the velocity v from the computation of the phase .phi..sub.x (m) of the function r.sub.x (m).

Abstract: An optical velocimetrical probe comprises means to illuminate a volume of measurement in which particles may pass, and optical detection means to produce an electrical signal x(t) in response to the passage of a particle in the illuminated volume. It also comprises means to extract information representing the velocity v of particles from the electrical signal, these means comprising,in particular, means to compute the density of probability p(x,.theta.) of the signal vector x(t), means to determine a frequency representing the velocity v for which this probability is the maximum.