Abstract: A power-steering system for a motor vehicle includes a steering wheel and an assistance motor controlled by a closed-loop regulation system, the regulation system determining a motor torque of the assistance motor as a function of a measured steering-wheel torque, using at least one “setpoint monitoring” arm calculating a component of the motor torque, referred to as “variant motor torque”, by subtracting a set steering-wheel torque from the RFe corresponding to the sum of the measured steering-wheel torque and the motor torque, wherein the variant motor torque is multiplied by a gain determined by a three-dimensional map as a function of a vehicle speed and the measured steering-wheel torque.

Abstract: A steering controller includes processing circuitry configured to execute a torque control process that calculates a steering-side operation amount, an angle feedback control process that calculates an angle-side operation amount, and an operation process that operates a drive circuit of an electric motor to adjust torque of the electric motor to a torque command value. The processing circuitry is further configured to execute a switch process that switches, when determining that a controllability of the electric motor is less than or equal to a predetermined efficiency, the torque command value from a value based on the angle-side operation amount to a value based on the steering-side operation amount instead of the angle-side operation amount.

Abstract: A steering controller includes processing circuitry configured to execute a first operation process that, when an angle command value is not input from outside of the processing circuitry, calculates a first torque command value corresponding to a steering-side operation amount and operating a drive circuit of an electric motor to adjust torque of the electric motor to the first torque command value. The processing circuitry is further configured to execute a second operation process that, when the angle command value is input from the outside of the processing circuitry, calculates a second torque command value corresponding to at least an angle-side operation amount of the steering-side operation amount and the angle-side operation amount and operating the drive circuit of the electric motor to adjust the torque of the electric motor to the second torque command value.

Abstract: A steering controller includes processing circuitry. The processing circuitry is configured to execute an operation process for calculating a torque command value corresponding to a sum of an amount by which the steering-side operation amount is converted into the torque required for the electric motor and an amount by which the steerable wheel-side operation amount is converted into the torque required for the electric motor and operate a drive circuit of the electric motor to adjust the torque of the electric motor to the torque command value.

Abstract: A method estimates a track rod force which is exerted, in a power steering system with which a vehicle is equipped, on a track rod belonging to a steering mechanism which connects an actuator to a steered wheel which is orientable in the yaw direction and which bears a tyre of which the tread is in contact with the ground, the value of the estimated track rod force being corrected as a function of the longitudinal speed of the vehicle by a force component that models the release of the elastic torsion of the tyre so as to reduce, the estimated track rod force according to the longitudinal speed of the vehicle, when the vehicle transitions from a park situation in which the longitudinal speed of the vehicle is zero to a drive situation in which the longitudinal speed of the vehicle is non-zero.

Abstract: A method for estimating the ageing of a steering mechanism during which the ageing of the steering mechanism is assessed by calculating a value called «ageing value» according to an ageing function (old, old2, ene) which corresponds to the integral, over time, of an expression which is weighted by a stress indicator (Tm(u), Ts(u)) the value of which at each considered instant (u) is representative of the intensity of a stress force (Tm, Ts), such as the operating force exerted by the assist motor, which is undergone by the steering mechanism at the considered instant.

Abstract: The invention relates to a method for managing an assisted steering device (1) for a vehicle (2) comprising a steering wheel (3) on which the driver exerts a manoeuvring effort, termed the “steering wheel torque” (T3), as well as an assistance motor (12) intended to provide an assistance effort (T12), said method comprising a steering wheel torque reconstruction step (a) in the course of which the steering wheel torque (T3) is evaluated, such as is actually exerted by the driver on the steering wheel (3), without calling upon a steering wheel torque sensor (14) specifically dedicated to the measurement of said steering wheel torque, but by reconstructing an information item representative of said steering wheel torque (T3), termed the “estimated steering wheel torque” (T3_estim), on the basis of data termed “external data” (83, 812, 8?3, 8?12) that is gathered outside a specific steering wheel torque sensor (14) such as this and which include the angular position of the steering wheel (83), the angular positi

Abstract: A method for managing an assisted steering device for a vehicle including a steering wheel on which the driver exerts a maneuvering effort (“steering wheel torque”), as well as an assistance motor intended to provide an assistance effort, said method including a steering wheel torque reconstruction step (a) in the course of which the steering wheel torque is evaluated, without calling upon a steering wheel torque sensor specifically dedicated to the measurement of said steering wheel torque, but by reconstructing an information item representative of said steering wheel torque (the “estimated steering wheel torque”), on the basis of data (“external data”) that is gathered outside a specific steering wheel torque sensor and which include the angular position of the steering wheel, the angular position of the shaft of the assistance motor, and the time derivatives of these angular positions.

Abstract: A method for detecting a situation of loss of grip of a vehicle provided with a steering system operated by a steering wheel, the method including a step (a) of evaluating a first indicator of loss of grip (P1) by calculating, as the first indicator of loss of grip (P1), the partial derivative ( P ? ? 1 = ? ? . ? ? ) , relative to a variable (?) representative of the angular position of the steering wheel, of a driving parameter which is representative of the yaw rate ({dot over (?)}) of the vehicle.

Abstract: The invention concerns a method for detecting a transition (4?) in a noisy signal, which involves submitting a noisy signal (?Signal) carrying an item of information used for managing the power steering, said method comprising a derivation sub-step (a1), which involves evaluating the time derivative of the noisy signal (?Signal/?t), following by a selective filtering sub-step (a2) which involves comparing said time derivative of the noisy signal (?Signal/?t) with a predefined variation threshold (Spic) in order to detect the appearance of a derivative peak (7), greater than said variation threshold (Spic), evaluating the holding time (dpic) of said derivative peak, during which the time derivative of the noisy signal (?Signal/?t) is held above said variation threshold (Spic), and checking if said peak holding time (Spic) reaches or exceeds a predefined minimum time threshold (d0).

Abstract: A method for managing a power steering system, including a step (a) of detecting a reversal in the steering direction which involves acquiring a signal, referred to as a “motor torque signal” (CMot), representative of the assistance force (Cassist) delivered by the power steering motor, then evaluating the time derivative (?CMot/?t) of the motor torque signal, then comparing the time derivative of the motor torque signal to a predefined variation threshold (Spic) in order to detect a derivative peak, greater than the variation threshold (Spic), that indicates a reversal in the steering direction. The method next includes a friction evaluation step (b) which involves evaluating the friction from the drop, during the reversal in the steering direction, in a so-called “actuation force signal” (Caction), which is representative of the total actuation force exerted together on the power steering by the driver and by the power steering motor.

Abstract: A method for evaluating the frictions in a power steering mechanism, the method including a step of acquiring a series of characterization points, during which are measured, for several different values taken successively by the assistance force during the operation of the steering mechanism, the corresponding friction values, so as to empirically obtain a series of distinct characterization points each associating a measured friction value to a measured value representative of the assistance force, then a step of constructing an empirical friction model, during which a correlation law is established between the characterization points constitutive of the series of characterization points, from the scatter chart formed by the series of the characterization points.

Abstract: A method determines a link force within a power-steering mechanism of a vehicle, the method including a step (a) of determining an actuation force, which involves determining the actuation force that results from the assistance force exerted by the assistance motor and the driver force exerted by the driver of the vehicle on the steering mechanism; a step (b) of assessing dry friction; and a step (c) of calculating the link force, which has a summation sub-step which involves calculating an expression representing the link force, which uses the algebraic sum of the actuation force and the dry friction force, and a filtering sub-step which involves applying a low-pass filter in order to smooth the result of the expression when the expression is calculated upon a steering reversal of the steering mechanism.

Abstract: A method for controlling a power steering device including a steering assist motor and a steering wheel. In the method, a steering wheel torque setpoint is generated, the actual steering wheel torque actually exerted by the driver on the steering wheel is measured, the difference, the so-called “steering wheel torque error”, between the steering wheel torque setpoint and the actual steering wheel torque is determined, then a motor torque setpoint for the steering assist motor is generated from a first filtered proportional component on one hand, obtained by filtering via a phase-lead filter the steering wheel torque error weighted by a first assist gain, and from a second derivative return component on the other hand, obtained by calculating the time derivative of the actual steering wheel torque and weighting the derivative by means of a second derivative gain.

Abstract: A method for managing a power-steering motor configured to supply a force to assist the movement of a steering rack involves the steering rack being mounted such as to be movable between at least a first position and a second position in order to be able to change the steering angle of a steered wheel. The method includes the steps of defining a virtual end-of-travel threshold strictly between the first position and the second position. If the rack is detected as having crossed the virtual end-of-travel threshold in a predetermined crossing direction, simulating, by the power-steering motor, an end-of-travel stop by including in the assistance instruction a resistance instruction that simulates the effect of a mechanical stop, such as a spring-damper or a mass-spring-damper, preventing the actuator member from progressing further beyond the virtual end-of-travel threshold.

Abstract: A method for detecting a situation of loss of grip of a vehicle provided with a steering system operated by a steering wheel, said method being in that it comprises a step (a) of evaluating a first indicator of loss of grip (P1) comprising calculating, as the first indicator of loss of grip (P1), the partial derivative ( P ? ? 1 = ? ? . ? ? ) , relative to a variable (?) representative of the angular position of the steering wheel, of a driving parameter which is representative of the yaw rate ({dot over (?)}) of the vehicle.

Abstract: A method for estimating the ageing of a steering mechanism during which the ageing of the steering mechanism is assessed by calculating a value called <<ageing value>> according to an ageing function (old, old2, ene) which corresponds to the integral, over time, of an expression which is weighted by a stress indicator (Tm(u), Ts(u)) the value of which at each considered instant (u) is representative of the intensity of a stress force (Tm, Ts), such as the operating force exerted by the assist motor, which is undergone by the steering mechanism at the considered instant.

Abstract: A method determines a link force within a power-steering mechanism of a vehicle, the method including a step (a) of determining an actuation force, which involves determining the actuation force that results from the assistance force exerted by the assistance motor and the driver force exerted by the driver of the vehicle on the steering mechanism; a step (b) of assessing dry friction; and a step (c) of calculating the link force, which has a summation sub-step which involves calculating an expression representing the link force, which uses the algebraic sum of the actuation force and the dry friction force, and a filtering sub-step which involves applying a low-pass filter in order to smooth the result of the expression when the expression is calculated upon a steering reversal of the steering mechanism.

Abstract: A method for evaluating the frictions in a power steering mechanism, the method including a step of acquiring a series of characterization points, during which are measured, for several different values taken successively by the assistance force during the operation of the steering mechanism, the corresponding friction values, so as to empirically obtain a series of distinct characterization points each associating a measured friction value to a measured value representative of the assistance force, then a step of constructing an empirical friction model, during which a correlation law is established between the characterization points constitutive of the series of characterization points, from the scatter chart formed by the series of the characterization points.

Abstract: The invention concerns a method for detecting a transition (4?) in a noisy signal, which involves submitting a noisy signal (?Signal) carrying an item of information used for managing the power steering, said method comprising a derivation sub-step (a1), which involves evaluating the time derivative of the noisy signal (?Signal/?t), following by a selective filtering sub-step (a2) which involves comparing said time derivative of the noisy signal (?Signal/?t) with a predefined variation threshold (Spic) in order to detect the appearance of a derivative peak (7), greater than said variation threshold (Spic), evaluating the holding time (dpic) of said derivative peak, during which the time derivative of the noisy signal (?Signal/?t) is held above said variation threshold (Spic), and checking if said peak holding time (Spic) reaches or exceeds a predefined minimum time threshold (d0).