Abstract: A controller of an active rear steering (ARS) control system includes a processor and a software module. The software module includes instructions that, when executed by the processor, cause the processor to determine rear steering angles, determine a vehicle state, determine shaping functions, and determine a rear steering command.

Abstract: A method for controlling a limited by-wire active front steering system includes measuring an input steering angle, determining a tire saturation limit, and comparing the saturation limit to the input angle. A target actuator angle from a steering actuator is limited when the input angle is greater than the saturation limit. A constant value provides a fixed steering gear ratio when the input angle is less than the saturation limit. A limited by-wire steering system for a vehicle includes a steering device, a sensor for measuring an input steering angle, a controller for calculating a first target actuator angle when the input angle is less than a threshold, and a second target actuator angle when the input angle is greater than the threshold. The threshold is a calibrated saturation limit of a road wheel of the vehicle.

Abstract: A controller of an active rear steering (ARS) control system includes a processor and a software module. The software module includes instructions that, when executed by the processor, cause the processor to determine rear steering angles, determine a vehicle state, determine shaping functions, and determine a rear steering command.

Abstract: A method is provided for limiting a steering angle overlay applied by a steering actuator in a limited by-wire active front steering (AFS) system. The method includes determining a maximum rate limit for the steering angle overlay in order to minimize an undesired disturbance to the driver in the form of a torque and/or angle feedback while maximizing the rate of steering overlay allowed for a given set of vehicle operating conditions. The maximum rate limit is determined by a function of the input steering rate and braking level. A limited AFS system includes both steering and braking input devices, a steering actuator, and a controller having an algorithm. The controller uses the algorithm to calculate the maximum overlay rate limit and limits the steering actuator to the maximum overlay rate limit.

Abstract: A method for controlling steering in a vehicle includes the steps of obtaining a vehicle steering communication, controlling an actuator coupled to a hand wheel, a road wheel, or both using a primary active steering functionality, if the vehicle steering communication reflects one or more of a plurality of types of specified errors, and controlling the actuator using the primary active steering functionality and a supplemental active steering functionality, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.

Abstract: A is provided method for communicating between software applications on a portable device and a software-controlled vehicle system of a vehicle. The portable device is linked to the software-controlled vehicle system. The portable device includes a host software application and slave software applications. The host software application is capable of enabling slave software applications stored on the portable device through the software-controlled vehicle system. The host software application is enabled in response to establishing a communication link from the software-controlled vehicle system to the portable device. An authorized slave software application of the portable device is manually selected utilizing a vehicle human machine interface of the vehicle. The selected slave software application is launched via the host software application invoking a launch request command to the selected slave software application.

Abstract: A motor control strategy for a motor in a front steering system for a vehicle that reduces vibrations from the motor being transferred to a vehicle hand-wheel. The control strategy also includes operating the electric motor in a commutation freeze mode if a position error signal is less than a first predetermined threshold by sending signals to coils of the motor to prevent to the motor from rotating, operating the electric motor in a commutation normal mode if the position error signal is greater than a second predetermined threshold that is greater than the first predetermined threshold, and operating the electric motor in an angle step mode if the position error signal is between an intermediate threshold and the second threshold where the angle step mode provides a signal to the motor to move the motor forward or backward a predetermined number of motor steps, one step at a time.

Abstract: A method is provided for limiting a steering angle overlay applied by a steering actuator in a limited by-wire active front steering (AFS) system. The method includes determining a maximum rate limit for the steering angle overlay in order to minimize an undesired disturbance to the driver in the form of a torque and/or angle feedback while maximizing the rate of steering overlay allowed for a given set of vehicle operating conditions. The maximum rate limit is determined by a function of the input steering rate and braking level. A limited AFS system includes both steering and braking input devices, a steering actuator, and a controller having an algorithm. The controller uses the algorithm to calculate the maximum overlay rate limit and limits the steering actuator to the maximum overlay rate limit.

Abstract: A motor control strategy for a motor in a front steering system for a vehicle that reduces vibrations from the motor being transferred to a vehicle hand-wheel. The control strategy also includes operating the electric motor in a commutation freeze mode if a position error signal is less than a first predetermined threshold by sending signals to coils of the motor to prevent to the motor from rotating, operating the electric motor in a commutation normal mode if the position error signal is greater than a second predetermined threshold that is greater than the first predetermined threshold, and operating the electric motor in an angle step mode if the position error signal is between an intermediate threshold and the second threshold where the angle step mode provides a signal to the motor to move the motor forward or backward a predetermined number of motor steps, one step at a time.

Abstract: A method for controlling a limited by-wire active front steering system includes measuring an input steering angle, determining a tire saturation limit, and comparing the saturation limit to the input angle. A target actuator angle from a steering actuator is limited when the input angle is greater than the saturation limit. A constant value provides a fixed steering gear ratio when the input angle is less than the saturation limit. A limited by-wire steering system for a vehicle includes a steering device, a sensor for measuring an input steering angle, a controller for calculating a first target actuator angle when the input angle is less than a threshold, and a second target actuator angle when the input angle is greater than the threshold. The threshold is a calibrated saturation limit of a road wheel of the vehicle.

Abstract: A method for controlling steering in a vehicle includes the steps of obtaining a vehicle steering communication, controlling an actuator coupled to a hand wheel, a road wheel, or both using a primary active steering functionality, if the vehicle steering communication reflects one or more of a plurality of types of specified errors, and controlling the actuator using the primary active steering functionality and a supplemental active steering functionality, if the vehicle steering communication does not reflect one or more of the plurality of types of specified errors.