Steering Control for Low-Temperature Road Wheel Actuator Friction
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Solution Overview
Problem
The steer by wire (SBW) system experiences increased friction in the road wheel actuator mechanism at low temperatures, leading to heavier steering sensations for the driver due to hysteresis, which existing systems fail to adequately compensate for.
Innovation Solution
A steering control device and method that determines compensation for friction in the road wheel actuator based on PCB temperature, rack position, and rack speed information, using a condition determinator, level determinator, and controller to adjust rack force information and control the steering feedback actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steer by wire system operates in low-temperature state, then the friction level of the road wheel actuator mechanism increases, but the steering feel becomes heavier and less consistent
Solution Approach 1:
The system performs preliminary determination of compensation conditions based on temperature, rack position, and rack speed before friction significantly degrades steering performance. By proactively identifying when compensation is needed and applying it in advance, the system prevents the harmful friction effects from manifesting as heavy steering feel, thereby maintaining steering consistency in low-temperature conditions
Solution Approach 2:
The system changes the rack force information parameter based on determined compensation conditions and friction levels. By dynamically adjusting the rack force parameter according to temperature, position, and speed conditions, the system compensates for increased friction and maintains consistent steering characteristics across different operating conditions
2Reliability
If the road wheel actuator mechanism operates at low temperature, then the grease physical properties change causing increased friction, but the steering reaction force becomes inconsistent
Solution Approach 1:
The system uses feedback from temperature sensors, rack position sensors, and rack speed sensors to continuously monitor operating conditions. Based on this feedback, the controller determines whether compensation conditions are met and adjusts the rack force information accordingly, creating a closed-loop control system that maintains consistent steering reaction force despite temperature variations and grease property changes
Solution Approach 2:
The system performs preliminary determination of compensation conditions based on temperature, rack position, and rack speed before friction significantly degrades steering performance. By proactively identifying when compensation is needed and applying it in advance, the system prevents the harmful friction effects from manifesting as heavy steering feel, thereby maintaining steering consistency in low-temperature conditions
Data Source
AI summary
The present embodiments relate to a steering control device and method and may provide a steering control device and method capable of compensating for the effect on the increased friction level of the road wheel actuator (RWA) mechanism at a low temperature in a steer by wire (SBW) system. In particular, there may be provided a steering control device and method capable for compensating for heavy steering that the driver may feel at low temperature by determining a friction level at a low temperature while driving according to a preset compensation condition and compensating for rack force information with respect to the friction level.