Steering Knob Reaction Force Actuator for Adaptive Feedback
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Solution Overview
Problem
Motor vehicle steering systems for loading vehicles and vehicles for people with disabilities face challenges in providing appropriate steering reaction forces during alternate manipulation of handles and knobs, particularly in switching between knob-based and steering wheel-based steering.
Innovation Solution
A motor vehicle steering system that includes a knob reaction force actuator, control means, and detection mechanisms to provide a suitable steering reaction force by controlling the reaction force based on knob position, rotation speed, and holding status, ensuring stability and familiarity for drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a knob is added to the steering wheel for alternate manipulation, then ease of operation is improved for drivers with disabilities, but device complexity increases
Solution Approach 1:
The steering wheel is segmented into two independent manipulation interfaces: the traditional steering wheel rim for conventional steering, and an added rotatable knob for alternate manipulation. This segmentation allows drivers to choose the most comfortable manipulation method while maintaining both functions independently
Solution Approach 2:
The knob structure serves multiple functions: it can be rotated about its own center axis for knob-based steering, and the entire knob assembly can rotate with the steering wheel for conventional steering. This multi-functionality allows a single component to support both manipulation methods
2Reliability
If a knob reaction force actuator is added to provide reaction force during knob manipulation, then steering stability is improved, but device complexity increases
Solution Approach 1:
The reaction force generation is segmented into two independent actuators: a wheel reaction force actuator for the steering wheel, and a knob reaction force actuator for the knob. This segmentation allows each actuator to be optimized for its specific manipulation interface without interfering with the other
Solution Approach 2:
The knob reaction force actuator serves as an intermediary between the knob manipulation input and the steering system response. It generates appropriate reaction forces during knob-based steering to provide tactile feedback and steering stability, mediating the interaction between the driver and the steering system
3Measurement precision
If reaction force control is implemented based on knob position detection, then steering precision is improved, but device complexity increases
Solution Approach 1:
A feedback control system is implemented where the knob position detection means continuously monitors the knob's rotational position, and this information is fed back to the control means which adjusts the knob reaction force actuator's output accordingly. This feedback loop enables precise control of reaction force based on actual knob position
Solution Approach 2:
The mechanical detection of knob position is replaced with sensor-based detection (knob position detection means). This substitution provides more precise and reliable position information while enabling electronic control of the reaction force, replacing traditional mechanical linkages with electronic sensing and actuation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively provides appropriate steering reaction forces during both knob-based and steering wheel-based operations, enhancing driver experience and safety by stabilizing vehicle behavior and maintaining a conventional steering feel.
Implementation Method 1
The knob reaction force actuator may include an electric motor
Implementation Method 2
the rotary damper is provided between the knob support and the knob and is capable of giving a reaction force caused by viscous resistance in response to the rotation of the knob about the knob center
Data Source
AI summary
A motor vehicle steering system includes a knob for rotationally manipulating a steering member and a knob reaction force actuator for giving a reaction force in response to the rotation of the knob. The knob has a knob center and is supported by the steering member in a manner rotatable about the knob center. Holding the knob and manipulating the steering member causes the knob to rotate (spin) about the knob center as the steering member rotates. The knob reaction force actuator then gives an appropriate reaction force in response to the rotation (spinning) of the knob.