Steer-by-Wire Steering Wheel Resistance From Multiple Axles
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Solution Overview
Problem
Steer-by-wire steering systems lack effective feedback mechanisms, particularly force feedback, especially when multiple steering axles are involved, leading to inadequate steering wheel resistance in situations like obstructed auxiliary steering axles.
Innovation Solution
A steering system with a steering wheel force actuation system that includes a reception interface, transformer module, and output interface to calculate and provide a realistic steering wheel resistance based on the forces from multiple steering axles, using measurement-sensor-based and model-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steer-by-wire steering system is used to eliminate mechanical connection between steering wheel and steering actuation system, then ease of operation is improved, but force feedback to the steering wheel is lost
Solution Approach 1:
The patent implements a feedback mechanism where the steering wheel actuation system receives information about steering forces from multiple steering axles and generates a corresponding steering wheel resistance. This feedback loop restores the force feedback sensation to the driver despite the lack of mechanical connection, allowing the driver to perceive road conditions and steering axle obstructions through the steering wheel.
Solution Approach 2:
The steering wheel actuation system acts as an intermediary between the steering wheel and the steering actuation system. It receives steering force information from the steering axles, processes it, and generates an appropriate resistance torque applied to the steering wheel, thereby mediating the force feedback that would otherwise be lost in the steer-by-wire system.
2Measurement precision
If steering force resistance values from multiple steering axles are combined to form overall steering force, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the steering force information from multiple steering axles into a single overall steering force value. The steering wheel actuation system combines the individual steering force resistance values from the front axle and auxiliary steering axle(s) to generate a unified steering wheel resistance, thereby improving measurement precision while managing system complexity through integration.
Solution Approach 2:
The steering wheel actuation system performs multiple functions: it controls the steering wheel position, measures steering forces from multiple axles, combines these forces, and generates the appropriate resistance torque. This multi-functionality allows the system to achieve precise steering force measurement without proportionally increasing device complexity.
Data Source
AI summary
A steering system including a steering device, a steering actuation system for a number of steering axles, a monitoring device, and a steering wheel force actuation system configured to generate a steering wheel resistance. The steering wheel force actuation system includes a reception interface configured to provide a number of steering force resistance values associated with a number of steering axles in a case of a steering angle adjustment of one or more steering axles, a transformer configured to convert steering force resistance values to a steering wheel resistance value, and an output configured to output the steering wheel resistance value. The transformer is configured to combine the steering force resistance values to form an overall steering force. The transformer is also configured to form an overall substitute value from the overall steering force value and to specify the steering wheel resistance value from the overall substitute value.