Steering Control System Actuator Synchronization
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Solution Overview
Problem
Steer-by-wire systems lack mechanical connection between the steering wheel feedback actuator and the road wheel actuator, leading to synchronization issues and a feeling of inadequate steering response.
Innovation Solution
A steering control system that calculates and sets a mid-point between the steering wheel feedback actuator and the road wheel actuator by generating control signals based on maximum displacement position values, using sensors to detect the position and rack force of the road wheel actuator, and transmitting these signals to adjust the actuator positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a steer-by-wire system is used to reduce weight, then vehicle weight is reduced, but synchronization between the steering wheel feedback actuator and road wheel actuator deteriorates
Solution Approach 1:
The system performs preliminary calibration actions by automatically moving the road wheel actuator to extreme positions (full left and full right) and detecting the corresponding steering wheel feedback actuator positions. This preliminary mapping establishes the synchronization relationship between the two actuators before normal operation, ensuring accurate steering response without mechanical connection.
2Manufacturing precision
If the road wheel actuator position is automatically calibrated, then mid-point setting precision is improved, but calibration time is increased
Solution Approach 1:
The calibration process uses periodic action by automatically moving the road wheel actuator to extreme positions (full left and full right) and back, detecting the corresponding steering wheel feedback actuator positions at each extreme. This periodic movement pattern enables automatic determination of the mid-point position through calculation, achieving high precision without manual intervention and reducing overall calibration time.
Data Source
AI summary
The disclosure relates to a steering control system, a steering control device, and a steering control method. According to an embodiment of the disclosure, there is provided a steering control device, comprising a receiver receiving sensing data from at least one of a rack bar position sensor or a rack force sensor, a controller generating a first control signal to move a road wheel actuator and a second control signal to move the road wheel actuator and a transmitter transmitting the first control signal and the second control signal to the road wheel actuator.