Abstract: A magnetoresistive sensor for measuring the strength of a magnetic filed includes a stack of a reference element, a separation element and an element sensitive to the magnetic field. The reference element and the sensitive element have, respectively, a first and a second magnetic anisotropy in a first and a second direction. The sensitive element includes the superposition of a layer of a ferromagnetic material and a layer of an antiferromagnetic material which are arranged to obtain a magnetic moment having a component oriented in the direction of the field to be measured that varies reversibly in relation to the strength of the magnetic field to be measured, and linearly in an adjustable field range.

Abstract: The Invention relates to a method for protecting a mechanical machine operation by punctually adding the determined quantity of at least one type of additive into said machine consisting in using an additive injection system (G1-G3) which comprises a reservoir containing a determined quantity of additive and a gas generator for expelling said additive from the reservoir to the machine and in actuating the gas generator when said machine operates at least in a critical condition. The mechanical machine provided with the system (G1-G3) for injecting said protective additive is also disclosed.

Abstract: A system for determining at least one parameter of at least one member (1) rotating with respect to a fixed structure (2), includes, for each rotating member (1), an assembly includes a transponder (3), a coder (5), an absolute position sensor (6) and a device (4) for detecting the parameter or parameters issuing from the transponder (3). The system also includes an activation device (7) which is connected to each sensor (6) and to each detection device (4), the activation device being able, according to the absolute position of the coder, to activate the detection device (4) of an assembly when the transponder (3) of the assembly is in the transmission/reception cone of the antenna of the detection device.

Abstract: The invention concerns a system for determining at least one parameter of at least one member (1) rotating with respect to a fixed structure (2), comprising, for each rotating member (1), an assembly comprising a transponder (3), a code (5) comprising a reference singularity, a sensor (6) able to deliver a signal comprising a reference pulse corresponding to the detection of the reference singularity, a device (4) for detecting the parameter or parameters issuing from the transponder (3) and a device for measuring the speed of rotation of the rotating member (1); the said system also comprising an activation device (7) which is connected to each sensor (6), to each detection device (4) and to each speed measurement device, the said activation device being able, when a reference pulse issuing from the sensor (6) of an assembly is recorded, to activate the detection device (4) of the assembly at a moment which is a function of the indexed position of the transponder (3) and of the measured speed, so that the tr

Abstract: The invention concerns a magnetoresistive magnetic field sensor comprising a stack (1) of a reference element (2), a separation element (3) and an element (4) sensitive to the magnetic field, in which the reference element (2) and the sensitive element (4) have respectively a first and a second magnetic anisotropy (5, 6) in a first and a second direction. The sensitive element (4) comprises the superposition of a layer of a ferromagnetic material (FM1) and a layer of an antiferromagnetic material (AF1) which is arranged in order to obtain a magnetic moment (10) whose component oriented in the direction of the field to be measured varies reversibly in relation to the strength of the magnetic field to be measured, and linearly in an adjustable field range. The invention also concerns a use of such a sensor.

Abstract: A system for determining at least one parameter of at least one member rotating with respect to a fixed structure, the system including, for each rotating member, an assembly having a transponder, a coder, a position sensor, and a device for detecting the parameter or parameters issuing from the transponder. The system also includes a synchronisation unit connected to each sensor and to each detection device. The synchronisation unit including a device for determining an activation position of the detection device of an assembly when the transponder of the assembly is in the transmission/reception cone of the communication mechanism of the detection device, and an activation device that is able, by comparing the position of the coder with the activation position, to activate the detection device of the assembly in order to measure the parameter or parameters.

Abstract: The invention concerns a suspension stop for a motor vehicle wheel, comprising a device for measuring the forces applied to the vehicle wheel, the said device comprising at least one deformation sensor (12) which is associated with a fixed member (1, 6) of the said stop so as to measure the deformations of the said member which are caused by the said forces applied, and a calculation means able, from these deformations, to calculate the corresponding forces applied.

Abstract: An actuating system having an electric motor that is controlled by a computer as a function of a setpoint position of a member that is to be actuated. The actuating system includes an encoder that is dependent on the movement of the motor, a sensor designed to deliver two square digital position signals in quadrature and which are representative of the position of the encoder, a device for processing the signals and which can determine the actual position of the encoder, and a device for comparing the actual position of the encoder with the position of the encoder that corresponds, in theory, to the applied setpoint. The actuating system can be used to actuate a member and/or actuate a device that meters the amount of fuel provided to a heat engine.

Abstract: A suspension stop for a motor vehicle wheel assembly comprising a fixed member adapted to be fixed to the chassis (2) of the vehicle and a rotating member adapted to be fixed to the suspension spring (4) so as to be rotationally moved under the effect of the forces exerted by the spring. The stop includes a device for measuring the vertical forces applied to the vehicle wheel. The device includes a pulse-generating coder (11) fixed to one of the members, a sensor (12) fixed to the other member which is able to detect these pulses so as to determine the angular position of the rotating member with respect to the fixed member, and a calculation device able, from this position, to calculate the corresponding vertical force applied. A method of measuring the vertical forces applied to a wheel associated with the chassis (2) of a vehicle by such a stop is also provided.

Abstract: The invention concerns a system for determining at least one parameter of at least one member (1) rotating with respect to a fixed structure (2), comprising, for each rotating member (1), an assembly comprising a transponder (3), a code (5) comprising a reference singularity, a sensor (6) able to deliver a signal comprising a reference pulse corresponding to the detection of the reference singularity, a device (4) for detecting the parameter or parameters issuing from the transponder (3) and a device for measuring the speed of rotation of the rotating member (1); the said system also comprising an activation device (7) which is connected to each sensor (6), to each detection device (4) and to each speed measurement device, the said activation device being able, when a reference pulse issuing from the sensor (6) of an assembly is recorded, to activate the detection device (4) of the assembly at a moment which is a function of the indexed position of the transponder (3) and of the measured speed, so that the t

Abstract: The invention concerns a system for determining at least one parameter of at least one member (1) rotating with respect to a fixed structure (2), comprising, for each rotating member (1), an assembly comprising a transponder (3), a coder (5), a position sensor (6) and a device (4) for detecting the parameter or parameters issuing from the transponder (3); the said system also comprising a synchronisation unit (7) which is connected to each sensor (6) and to each detection device (4), the said unit comprising a device (7a) for determining an activation position of the detection device (4) of an assembly when the transponder (3) of the assembly is in the transmission/reception cone of the communication means of the said detection device, and an activation device (7b) able, by comparing the position of the coder (5) with the activation position, to activate the detection device (4) of the assembly in order to measure the parameter or parameters.

Abstract: The invention concerns a system for determining at least one parameter of at least one member (1) rotating with respect to a fixed structure (2), comprising, for each rotating member (1), an assembly comprising a transponder (3), a coder (5), an absolute position sensor (6) and a device (4) for detecting the parameter or parameters issuing from the transponder (3); the said system also comprising an activation device (7) which is connected to each sensor (6) and to each detection device (4), the said activation device being able, according to the absolute position of the coder, to activate the detection device (4) of an assembly when the transponder (3) of the assembly is in the transmission/reception cone of the communication means of the said detection device.

Abstract: The invention relates to an actuating system of the type comprising an electric motor (1) controlled by a computer (2) as a function of a position setpoint of the member that is to be actuated, said system comprising an encoder (3) that is dependent on the movement of the motor (1), a sensor designed to deliver two square digital position signals (A, B) in quadrature which are representative of the position of the encoder (3), a device (5) for processing the signals (A, B), which device can determine the actual position of the encoder (3), and a device (6) for comparing the actual position of the encoder (3) with the position of the encoder (3) that corresponds in theory to the applied setpoint.

Abstract: The invention concerns a suspension stop for a motor vehicle wheel of the type comprising a fixed member intended to be fixed to the chassis (2) of the vehicle and a rotating member intended to be fixed to the suspension spring (4) so as to be rotationally moved under the effect of the forces exerted by the said spring, the said stop comprising a device for measuring the vertical forces applied to the vehicle wheel, the said device comprising a pulse-generating coder (11) which is fixed to one of the members, a sensor (12) fixed to the other member which is able to detect these pulses so as to determine the angular position of the rotating member with respect to the fixed member, and a calculation means able, from this position, to calculate the corresponding vertical force applied.

Abstract: The invention concerns a suspension stop for a motor vehicle wheel, comprising a device for measuring the forces applied to the vehicle wheel, the said device comprising at least one deformation sensor (12) which is associated with a fixed member (1, 6) of the said stop so as to measure the deformations of the said member which are caused by the said forces applied, and a calculation means able, from these deformations, to calculate the corresponding forces applied.

Abstract: The invention relates to an electronically commutated motor (1) comprising P phases and N pairs of poles, in which a circular multipole encoder (12) is associated with the rotating ring (6a) of an anti-friction bearing (6), said encoder (12) comprising a main multipole track (12a) and a multipole commutation track (12b) comprising 2*P*N singularities (12b1-12b6) equidistributed angularly and a control device comprising a fixed sensor (15) capable of delivering square digital signals A, B in quadrature and a digital signal C in the form of 2*P*N pulses per revolution of the encoder (12), a circuit for commutating (20) the currents in the phase windings of the motor (1) and a control circuit (21) for the commutation circuit (20).

Abstract: A device includes at least one magnetic field generator placed on a first plane of a right section of a shaft and at least one magnetic field detector placed in a second plane of a right section of the shaft. The detector produces a signal proportional to the torque following the relative angular shift of the field generator in relation to the detector, the magnetic field generator having a magnetic structure supported by support mechanisms connected to the turning shaft. The magnetic field detector is located roughly opposite the magnetic field generator and is supported by support mechanisms connected to the turning shaft.

Abstract: The invention relates to an electric power-assisted steering system making it possible to apply an assist torque for the angular displacement of the wheels of a vehicle, said torque being applied by an electronically commutated motor (2) comprising P phases and N pairs of poles, said system also comprising a device for controlling the motor (2) comprising a circular multipole encoder (17) comprising a main multipole track (17a) and a multipole commutation track (17b) comprising magnetic singularities (17b1-17b6) equidistributed angularly, a fixed sensor (19) capable of delivering square digital signals A, B in quadrature, and a signal C in the form of 2*P*N pulses per revolution of the rotor (3), a circuit for commutating (20) the currents in the phase windings of the motor (2) and a control circuit (21) for the commutation circuit (20).

Abstract: The invention relates to a device for controlling an electronically commutated motor (1) comprising P phases and N pairs of poles (5), said device comprising: a circular multipole encoder (4) comprising a main multipole track (4a) and a multipole commutation track (4b) comprising 2*P*N singularities (4b1-4b6) equidistributed angularly; a fixed sensor (6) capable of delivering square digital signals A, B in quadrature and a digital signal C in the form of 2*P*N pulses (TP1-TP6) per revolution of the encoder; a commutation circuit (7) having 2*P*N switches (T1-T6); a control circuit (8) for the commutation circuit (7) which: from the signal c supplies commutation signals for the switches (T1-T6); and from the signals A, B and according to a first current set point (I*) defines a second current set point (Iref) which controls the current (Im) supplying the phase windings of the motor (1).

Abstract: The object of the invention is an assembly comprising a bearing (1) and a mechanical interface (5) associated, by means of association means (7), with the fixed raceway (2) of the bearing (1), this interface (5) being intended to be interposed between the fixed raceway (2) of the bearing (1) and the fixed structure, the said interface (5) comprising: first means (8) of fixing to the fixed structure; second means (9) of fixing a device (10) intended to apply a force to the rotating member (6); and at least one elastic deformation zone (29-33) able to be deformed under the action of forces exerted on the said assembly, at least one sensor (38) able to measure the said forces being functionally associated with the said elastic deformation zone (29-33).