Jtekt Europe

Romain Moretti

Luc Leydier

Tahar Slama

Stephane Cassar

Alain Guilemond

Olivier Barry

Stéphane Cassar

Method for monitoring the operation of a power steering system including a steering wheel, a servo motor and a monitoring module, characterized in that said method involves a step of determining at least one temporary limit value of a parameter, a step of estimating an additional value which an assistance functionality contributes to a setpoint value of the parameter, and a step of correcting the at least one temporary limit value by the additional value.

Method for supervising the operation of a power steering system

A method for managing a vehicle assisted steering system including one assistance function intended to help a driver drive the vehicle and one safety function intended to give assistance function a predetermined ASIL level as defined by the ISO-26262 standard, the assistance function and safety function each make use of a vehicle speed indicator parameter, including a step of estimating a functional speed of the actual longitudinal speed of the vehicle, used by default as the vehicle speed indicator parameter, a step of estimating a speed upper bound, a step of calculating an underestimated speed resulting from the application, to the speed upper bound, of a reduction value derived from a reduction law, and, if the functional speed is lower than the underestimated speed, and a step of switching in which the underestimated speed is substituted for the functional speed as the vehicle speed indicator parameter.

Method for optimizing a vehicle speed indicator parameter intended for the steering assistance functions and the safety functions

The invention concerns a method for determining the direction of longitudinal travel of a vehicle comprising a step (a) of collecting a first signal (Signal), representative of a first driving parameter, such as the steering-wheel torque, and of which the sign of the value and/or the sign of the variations is not dependent on the direction of longitudinal travel of the vehicle, a step (b) of collecting a second signal (Signal), representative of a second driving parameter separate from the first driving parameter, such as the yaw rate, and of which the sign of the value and/or the sign of the variations changes on the basis of the direction of longitudinal travel of the vehicle, then a step (c) of comparing signs during which the sign of the value, or of the variation, of the first signal (Signal) is compared with the sign of the value, or of the variation, of the second signal (Signal) in order to deduce therefrom the direction of longitudinal travel of the vehicle, depending on whether said signs are identical or, on the contrary, different.

Method for detecting the direction of travel of a motor vehicle

A method of controlling a power steering system including at least one course control function, whereby a position setpoint is determined automatically according to a reference course that a vehicle is to be made to follow, then a motor setpoint applied to an assistance motor is adjusted accordingly, the method including a safety function which is distinct from the course control function and meets a higher ASIL safety level according to ISO-26262 standard, said safety function including a diagnostics subfunction according to which a control parameter such as the angular position of the steering wheel, the driver torque applied to the steering wheel, or the rate at which the steering wheel is turned is monitored in order to detect the onset of an alert situation considered to be hazardous, then an intervention subfunction according to which, if an alert situation is detected, the course control function is neutralized.

Securing of a driving assistance function within a power steering

A method for managing a power steering system including at least one steering wheel and at least one assist motor, the method including a step of driver torque control, which involves evaluating a driver torque difference that corresponds to the difference between a predefined driver torque setpoint and the actual driver torque actually exerted by the driver on the steering wheel, then determining an engine torque setpoint for torque applied to the assist motor in order to reduce the driver torque difference, the driver torque setpoint being generated during a trajectory control step, which involves evaluating a trajectory difference, for example a position difference, which corresponds to the difference between a trajectory setpoint, of the position setpoint type, which depends on a reference trajectory, and the actual trajectory of the vehicle, given by the measured position of the power steering, then determining, from the trajectory difference, a driver torque setpoint intended to reduce the trajectory difference.

Mixed steering assistance comprising a torque control loop setpoint-piloted by a position controller intended for path control

A method for controlling a steering system having an electric assistance motor in view of reducing shocks against end-of-travel stop, the method including getting a distance information of the rack with respect to the end of travel stop, getting an actual rotation speed information of the steering wheel, identifying a maximum allowed acceleration for the steering wheel, the maximum allowed acceleration being such that, in view of the distance information and the actual rotation speed information, the rotation speed of the steering wheel can decrease pursuant to a target deceleration value of a target deceleration profile so as to be lower than a required maximal speed when arriving at the end-of-travel stop, determining a maximum power assistance torque from the maximum allowed acceleration for controlling the power assistance torque applied to the assistance motor so as to target the deceleration value or profile of the rotation of the steering wheel.

Method for controlling end of travel for electric power-assisted steering

The invention relates to a method for determining the absolute angular position of a steering wheel () of a vehicle, said method involving an initial-estimate step (a) during which a first value (Angle) indicative of the absolute angular position of said steering wheel () is evaluated by a first model based on analyzing a first vehicle running dynamic parameter, such as the speed differential of the wheels of one wheelset, a second-estimate step (b) during which a second value (Angle) indicative of the absolute angular position of said steering wheel is evaluated by a second model based on analyzing a second dynamic parameter, such as the yaw rate, followed by a checking step (c) during which the difference between the first value (Angle) and the second value (Angle) is compared against a predetermined consistency threshold (S) in order to decide, through suitable weighting, whether said values are to be considered or excluded.

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Soucieu en Jarrest, France

Romain Moretti