Abstract: The present invention relates to a method for estimating the movement of an object (1) moving in an environment (?) and an ambient magnetic field, the method being characterised in that it includes the steps of: (a) Acquisition: by inertial measurement means (24) fixed with respect to said object (1), of at least one component of an acceleration and/or an angular velocity of the object (1), designated inertial datum; by magnetic measurement means (20) fixed with respect to said object (1), of at least one component of the magnetic field and/or an i-th derivative of the magnetic field, at the magnetic measurement means (20), designated magnetic datum; by optical acquisition means (26) fixed with respect to said object (1), of consecutive images of the environment (?), designated vision datum; (b) Estimation by the data processing means (21, 31, 41) of at least one component of the movement of said object (1) using the inertial datum, as well as the magnetic datum and/or the vision datum.

Abstract: The invention relates to a method for determining a heading, in which a magnetic field is measured by at least one magnetometer and a magnetic heading is determined from said measurement and in which calculation means implement a processing calculating, for each measurement of magnetic heading, a value for characterising the heading thereby determined, characterised in that said characterisation value is a monotone function of a norm of the measured magnetic field gradient, said value being used in the determination of the heading.

Abstract: The present invention relates to a method for calibrating a magnetometer (3) in which the magnetometer (3) is arranged inside the windings (21) of a generator (2), a magnetic field being generated by the generator (2), a series of measurements of the magnetic field with the magnetometer (3) being carried out by varying the position of the magnetometer (3) and/or the electric currents in the windings (21) between each measurement, the electric currents applied in the windings (21) also being measured, a parametric transfer model being generated from a parametric measurement model of the magnetometer including parameters for calibrating the magnetometer and a parametric model of the magnetic field, the parameters for calibrating the magnetometer (3) being calculated by an optimisation algorithm from the parametric transfer model and measurements of the magnetic field by the magnetometer and measurements of the currents in the windings.

Abstract: The invention relates to a magnetic field measurement by a set of magnetometers (20) which are linked to a same moveable support and which have different orientations of eigendirections with respect to this support. The processing means implement, during a measurement in a given position and orientation of the support and of the set of magnetometers, a determination, for each magnetometer, of the orientation deviation between the eigendirections of the magnetometer and the “candidate” magnetic field, a determination of the magnetometer for which this deviation is minimal, the magnetic field measured by this sensor being selected as the magnetic field measured by the set of magnetometers. The magnetometers (20) are distributed in space in order to cover a maximum of different orientations.

Abstract: The invention relates to the determination of heading by magnetic sensors, in which a magnetic field is measured by magnetometers and calculation means implement a recursive processing calculating for a given sampling time: an estimation of a heading prediction which is a function of the heading determined at the preceding sampling time, a resetting of the predicted heading thereby estimated as a function of a magnetic heading determined from magnetometer measurements. During said resetting, the calculation means estimate the amplitude of the resetting as a function: of a model of the change in magnetic disturbances between two sampling times, and of an a priori estimation of the amplitude of the disturbances.

Abstract: The present invention relates to a method for estimating the movement of an object (1) moving in an ambient magnetic field, the method being characterised in that it comprises the steps of: (a) Acquiring by magnetic measurement means (20) integral with said object (1) at least one component: of the magnetic field and/or of at least one i-th derivative of the magnetic field, with n+1?i?1, n?1, ?at the level of the magnetic measurement means (20); (b) Estimating by the data processing means (21, 31, 41) at least one component of the movement of said object (1) using at least one component of the equation ?{dot over (n)}B=fn(?)·?nB+gn(?n+1B)·V, where ?nB is an n-th derivative of the magnetic field, ? the instantaneous angular velocity, V the instantaneous linear velocity, and fn and gn predetermined functions.

Abstract: The present invention relates to a method for estimating the relative orientation between a tibia (11a) and a femur (11b) of a lower limb (10) of a person (1), the method being characterised in that it comprises the steps of: (a) During at least one reference movement of said lower limb (10) from a reference position, acquiring by first inertial measuring means (20a) integral with the tibia (11a) and by second inertial measuring means (20b) integral with the femur (11b) reference accelerations and angular velocities; (b) Estimating a plurality of morphological parameters of said lower limb (10), as a function of said measured reference accelerations and angular velocities; (c) Determining a relative orientation in said initial position between said tibia (11a) and femur (11b), as a function of said estimated morphological parameters of said lower limb (10); (d) During a working movement of said lower limb (10) from an initial position, acquiring by the first inertial measuring means (20a) and the second iner

Abstract: The present invention relates to a method for estimating the movement of a walking pedestrian (1), the method being characterised in that it comprises the following steps: (a) Acquisition, by inertial-measurement means (20) rigidly connected to a lower limb (10) of said pedestrian (1) and positioned in such a way as to have substantially a movement of rotation with respect to a distal end (11) of said lower limb (10) at least when said distal end (11) of the lower limb (10) is in contact with the ground, of an acceleration and of an angular speed of said lower limb (10); (b) Estimation, by data-processing means (21, 31, 41), of a speed of said lower limb (10) according to said measured acceleration and said measured angular speed.

Abstract: The invention is a method of controlling the combustion of a diesel engine comprising determining setpoint values for physical parameters linked with the intake of gaseous oxidizer in the combustion chamber, and a setpoint value ?injref for the crank angle at which fuel has to be injected into the combustion chamber. While the engine control system controls actuators in such a way that the values of the physical parameters are equal to the setpoint values, setpoint value ?injref is corrected before the physical parameters reach their setpoint values, by accounting for the differences between the real values of the physical parameters and the setpoint values of these parameters. Finally, the engine control system controls fuel injection into the combustion chamber when the crank angle is equal to this corrected setpoint value ?injref in order to keep combustion optimal.

Abstract: A method of controlling the combustion of a spark-ignition engine having application to gasoline engines is disclosed. An engine control system controls actuators so that the values of physical parameters linked with the combustion of a mixture of gas and fuel in a combustion chamber are equal to their setpoint values, to optimize the combustion. A setpoint value is determined for an ignition crank angle of the fuel mixture which is then corrected before the physical parameters reach their setpoint values. A correction to be applied to this ignition angle setpoint value is calculated so that the crank angle CAy is equal to its setpoint value. Finally, the engine control system controls the ignition of the mixture in the combustion chamber when the crank angle is equal to the corrected setpoint value to optimize combustion.

Abstract: A method of controlling the combustion of a compression ignition engine is disclosed having applications for diesel engine combustion control for CAI. The method comprises determining setpoint values for physical parameters linked with the intake of gaseous oxidizer in the combustion chamber, and a setpoint value (?inj)ref for the crank angle at which a fuel has to be injected into the combustion chamber. While the engine control system controls actuators so that the values of the physical parameters are equal to the setpoint values, setpoint value (?inj)ref is corrected before the physical parameters reach their setpoint values. Angle CAy is controlled to be equal to a reference value for an optimized combustion while accounting for differences between the real values of the physical parameters and the setpoint values of these parameters and keeps the optimum combustion by fuel injection with the corrected setpoint value.

Abstract: The invention is a method of controlling the combustion of a diesel engine comprising determining setpoint values for physical parameters linked with the intake of gaseous oxidizer in the combustion chamber, and a setpoint value ?injref for the crank angle at which fuel has to be injected into the combustion chamber. While the engine control system controls actuators in such a way that the values of the physical parameters are equal to the setpoint values, setpoint value ?injref is corrected before the physical parameters reach their setpoint values, by accounting for the differences between the real values of the physical parameters and the setpoint values of these parameters. Finally, the engine control system controls fuel injection into the combustion chamber when the crank angle is equal to this corrected setpoint value ?injref in order to keep combustion optimal.

Abstract: A method of controlling the combustion of a spark-ignition engine having application to gasoline engines is disclosed. An engine control system controls actuators so that the values of physical parameters linked with the combustion of a mixture of gas and fuel in a combustion chamber are equal to their setpoint values, to optimize the combustion. A setpoint value is determined for an ignition crank angle of the fuel mixture which is then corrected before the physical parameters reach their setpoint values. A correction to be applied to this ignition angle setpoint value is calculated so that the crank angle CAy is equal to its setpoint value. Finally, the engine control system controls the ignition of the mixture in the combustion chamber when the crank angle is equal to the corrected setpoint value to optimize combustion.

Abstract: Method A method of controlling the combustion of a compression ignition engine is disclosed having applications for diesel engine combustion control for CAI. The method comprises determining setpoint values for physical parameters linked with the intake of gaseous oxidizer in the combustion chamber, and a setpoint value (?inj)ref for the crank angle at which a fuel has to be injected into the combustion chamber. While the engine control system controls actuators in such a way that the values of the physical parameters are equal to the setpoint values, setpoint value (?inj)ref is corrected before the physical parameters reach their setpoint values. Angle CAy is therefore controlled in such a way that it is equal to a reference value for an optimized combustion, while taking account of accounting for the differences between the real values of the physical parameters and the setpoint values of these parameters.