Steering Nibble Control in Position Controlled Systems
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Solution Overview
Problem
Position controlled steering systems, such as active front steering and steer-by-wire systems, face challenges in controlling steering nibble without torque sensors, which is a rotational vibration causing customer dissatisfaction.
Innovation Solution
A controller determines actuator angle data and nibble control angle data based on steering wheel angle data, generating a control signal to apply torque via an actuator, using processes like gain scheduling, tuned resonator filters, and phase compensation to reduce or eliminate steering nibble.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If position controlled steering systems are used without torque sensors, then system complexity and cost are reduced, but the ability to detect and control steering nibble is worsened
Solution Approach 1:
The patent introduces an intermediary approach by using position sensors and control algorithms as mediators to indirectly detect and control steering nibble, replacing the need for direct torque sensing. The position controlled actuator serves as an intermediary device that can both sense position variations and apply corrective forces without requiring torque sensors.
Solution Approach 2:
The patent replaces the mechanical torque sensing system with an electronic position control system. Instead of using mechanical torque sensors to detect steering nibble, the system uses position sensors combined with electronic control algorithms to detect and eliminate nibble, substituting mechanical detection with electronic measurement and control.
2Manufacturing precision
If traditional torque sensor-based nibble control is implemented, then steering nibble control precision is improved, but system cost and complexity increase
Solution Approach 1:
The position controlled actuator serves itself by using its own position feedback to detect and control steering nibble. The system leverages the existing position control infrastructure to perform both positioning and nibble control functions, eliminating the need for separate torque sensors and reducing overall system complexity while maintaining control precision.
Data Source
AI summary
Methods and apparatus for controlling steering nibble in position controlled steering systems are described. A controller is to determine actuator angle data based on steering wheel angle data associated with a steering wheel. The controller is also to determine nibble control angle data based on the steering wheel angle data. The controller is also to determine adjusted actuator angle data based on the actuator angle data and the nibble control angle data. The controller is also to generate a control signal based on the adjusted actuator angle data to apply a torque via an actuator of a position controlled steering system.