Abstract: Disclosed is a method for estimating a physical stoppage of an engine of a motor vehicle, subject to bounce-back, a target equipped with teeth being borne by the crankshaft and successive passes of the teeth past a sensor being detected, a first time count incrementing since a last detection of the passing of a tooth and being associated with a first time threshold with the first count being reset to zero when the time between passes of two successive teeth is below the first threshold. A second count associated with a second time threshold is performed, with this count being suspended when and for as long as a time between the passes of two successive teeth is below the second threshold, the engine being estimated to have stopped as soon as the counts have respectively reached the first and second thresholds.

Abstract: Disclosed is a method for processing position data of an automotive vehicle motor, implemented by a multi-core electronic computer including: a software module for the production of data of angular position of the motor, and at least one software module for driving the motor as a function of the angular position data. The method includes a step of deactivation of each drive module by the module for the production of angular position data, followed by a step of activation of each drive module by the production module. In the course of the deactivation step, the production module dispatches to each drive module a deactivation command, and then a request for confirmation that each drive module is deactivated, and the step of activation of the drive modules is implemented only when the deactivation of all the drive modules has been confirmed to the production module.

Abstract: The invention relates to a crankshaft, transmission or camshaft sensor (10) for a motor vehicle, intended for being connected to an engine control unit (30) by a cable (20). The sensor comprises a processing module (17) and a voltage-modifying circuit (18) configured to generate an output signal via an output port (12) of the sensor (10) allowing a diagnosis module (36) of the engine control unit (30) to detect and identify faults of the sensor (10) or the cable (20). In particular, the processing module (17) is configured to provide on its output port (172), when the toothed target (14) is immobile, a predetermined pattern representing the fact that the toothed target (14) is immobile, this predetermined pattern corresponding to a status change of the output port (172) of the processing module (17) with a predetermined time and repeated periodically. The invention likewise relates to a diagnosis system (1) comprising such a sensor (10), a cable (20) and an engine control unit (30).

Abstract: Disclosed is a method for processing position data of an automotive vehicle motor, implemented by a multi-core electronic computer including: a software module for the production of data of angular position of the motor, and at least one software module for driving the motor as a function of the angular position data. The method includes a step of deactivation of each drive module by the module for the production of angular position data, followed by a step of activation of each drive module by the production module. In the course of the deactivation step, the production module dispatches to each drive module a deactivation command, and then a request for confirmation that each drive module is deactivated, and the step of activation of the drive modules is implemented only when the deactivation of all the drive modules has been confirmed to the production module.

Abstract: A method for protecting a dual mass flywheel DMF, by detecting, when the engine in running, that the DMF is entering into resonance, the DMF being arranged between an internal combustion engine and a gearbox of a vehicle, comprising the following steps: • Determining the average rotational speed (Vvilmoy) of the crankshaft, over time, over a predetermined given period, as a first parameter constituting a risk of the DMF entering into resonance, • Measuring the maximum instantaneous rotational speed and the minimum instantaneous rotational speed of the crankshaft, the difference defining the maximum amplitude (AmpVvil) of the rotational oscillations of the crankshaft, over the period, as a second parameter constituting a risk of the DMF entering into resonance, • Detecting when the DMF is entering into resonance from a determined combination of values of the first and second parameters, over the period, • limiting or cutting off the fuel injection in the cylinders after said detection.

Abstract: Disclosed is a method for estimating a physical stoppage of an engine of a motor vehicle, subject to bounce-back, a target equipped with teeth being borne by the crankshaft and successive passes of the teeth past a sensor being detected, a first time count incrementing since a last detection of the passing of a tooth and being associated with a first time threshold with the first count being reset to zero when the time between passes of two successive teeth is below the first threshold. A second count associated with a second time threshold is performed, with this count being suspended when and for as long as a time between the passes of two successive teeth is below the second threshold, the engine being estimated to have stopped as soon as the counts have respectively reached the first and second thresholds.

Abstract: Disclosed is a method for determining actual lengths of short intervals, shorter than one segment of a toothed target of the crankshaft. The determination method includes: —a measurement step measuring first times, each corresponding to the time that the target takes to traverse a long interval of a length of a segment, and second times, each corresponding to the time that the target takes to traverse a short interval, —a correction step calculating a first ratio between two long intervals and a second ratio between two short intervals, —a step of obtaining the actual length of each of the long intervals, —a step of calculating a difference in length between two long intervals, —and a step of determining the respective actual lengths of a pair of short intervals of the toothed target.

Abstract: This method includes the following steps: —determining the angular position and the rotational speed for a first point of measurement and a second point of measurement of a engine position sensor, —determining at least one gradient of the rotational speed different from the speed gradient between the two points of measurement of the previous step, —approximating the actual rotational speed curve with respect to the angular position with a polynomial function of degree two, and —carrying out a calculation, in advance, for determining an estimated rotational speed at the predefined position, the position defining a future angular position of the crankshaft, by applying the polynomial function to the predefined future position. The method can be used to predict engine rotation reversal.

Abstract: A method prevents the stalling of the engine of a hybrid vehicle (1) equipped with an auxiliary motor (4) and wheels (R1 to R4), pistons (2a to 2d), tank (3), axle (5), drive shaft (6), gearbox (7), connections (8a, 8b), and computer (9). The method uses an estimate of the predicted instantaneous speed of the main engine (2) at its next top dead center, for the purpose of assisting the main engine in a stall situation, via the auxiliary motor which can supply sufficient power to it on a one-off basis to prevent it from stopping. The method defines two levels of instantaneous speed. If the predicted instantaneous speed is located in the intervention zone between the two levels, the auxiliary motor assists the rotation of the main engine to enable it to rotate in the same direction, without stalling.

Abstract: Disclosed is a method for determining actual lengths of short intervals, shorter than one segment of a toothed target of the crankshaft. The determination method includes:—a measurement step measuring first times, each corresponding to the time that the target takes to traverse a long interval of a length of a segment, and second times, each corresponding to the time that the target takes to traverse a short interval,—a correction step calculating a first ratio between two long intervals and a second ratio between two short intervals,—a step of obtaining the actual length of each of the long intervals,—a step of calculating a difference in length between two long intervals,—and a step of determining the respective actual lengths of a pair of short intervals of the toothed target.

Abstract: The subject of the present invention is a method for communicating a malfunction of a system for measuring speed and direction of rotation of a rotary shaft, said system comprising: a toothed wheel associated with said rotary shaft, called target (14), a magnetic field sensor (10?), measuring values (K, A) of the magnetic field (B, B?, B?) generated by the passage of the teeth (T1, T2 . . . Ti) in front of said sensor (10?) and delivering a signal (S, S?, S?) to processing means 13). According to the invention, the method comprises the following steps: step 1: comparison by the sensor between the measured values and predetermined threshold values of the magnetic field, step 2: if the measured values are below the predetermined threshold values, step 3: generation by the sensor of a coding on the signal, representative of the measured values, to communicate a malfunction of the system to the processing means.

Abstract: A method for preventing the stalling of the engine of a hybrid vehicle (1) equipped with an auxiliary motor (4), generally an electric motor, and with related equipment, namely wheels (R1 to R4), pistons (2a to 2d), tank (3), axle (5), drive shaft (6), gearbox (7), connections (8a, 8b), and computer (9). The method uses an estimate of the predicted instantaneous speed of the main engine (2) at its next top dead center, for the purpose of assisting the main engine in a stall situation, via the auxiliary motor which can supply sufficient power to it on a one-off basis to prevent it from stopping. The method defines two levels of instantaneous speed. If the predicted instantaneous speed is located in the intervention zone between the two levels, the auxiliary motor assists the rotation of the main engine to enable it to rotate in the same direction, without stalling.

Abstract: The subject of the present invention is a method for communicating a malfunction of a system for measuring speed and direction of rotation of a rotary shaft, said system comprising: a toothed wheel associated with said rotary shaft, called target (14), a magnetic field sensor (10?), measuring values (K, A) of the magnetic field (B, B?, B?) generated by the passage of the teeth (T1, T2 . . . Ti) in front of said sensor (10?) and delivering a signal (S, S?, S?) to processing means 13). According to the invention, the method comprises the following steps: step 1: comparison by the sensor between the measured values and predetermined threshold values of the magnetic field, step 2: if the measured values are below the predetermined threshold values, step 3: generation by the sensor of a coding on the signal, representative of the measured values, to communicate a malfunction of the system to the processing means.

Abstract: This method includes the following steps: determining the angular position and the rotational speed for a first point of measurement and a second point of measurement of a engine position sensor, determining at least one gradient of the rotational speed different from the speed gradient between the two points of measurement of the previous step, approximating the actual rotational speed curve with respect to the angular position with a polynomial function of degree two, and carrying out a calculation, in advance, for determining an estimated rotational speed at the predefined position, the position defining a future angular position of the crankshaft, by applying the polynomial function to the predefined future position. The method can be used to predict engine rotation reversal.