Steering Feedback Mapping for Shared ADAS Control Awareness
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Solution Overview
Problem
Conventional Advanced Driver-Assistance Systems (ADAS) are deficient in communicating the degree of control sharing between human operators and the system, particularly in shared control functionality, and do not adequately account for human perception factors, leading to inadequate feedback to operators, especially in steer-by-wire systems.
Innovation Solution
A blending parameter notification system that utilizes a psychophysical model to determine a feedback parameter, which is used to provide proportional sensory feedback to the operator through haptic, thermal, or visual means, such as vibration, temperature, or lighting, integrated into the steering apparatus, to effectively communicate the degree of control sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ADAS provides control sharing without psychophysical optimization, then the system is simpler to implement, but the operator's perception of control sharing is inaccurate and non-proportional
Solution Approach 1:
The patent transforms the linear blending parameter into a psychophysically optimized feedback parameter using mathematical models (e.g., power law transformations). This parameter transformation ensures that the feedback signal's physical quantity (vibration amplitude, light intensity, temperature) changes in a manner that matches human sensory perception characteristics, making the operator's perception of control sharing accurate and proportional to the actual control distribution.
Solution Approach 2:
The patent introduces a psychophysical model as an intermediary layer between the control system and the feedback modality. This model acts as a mediator that processes the blending parameter and converts it into appropriately scaled feedback signals, accounting for human sensory non-linearity without requiring direct modification of the control algorithms themselves.
2Ease of operation
If ADAS uses linear feedback parameter mapping, then the system is easier to implement, but human perception of control sharing becomes non-proportional and inaccurate
Solution Approach 1:
The patent applies parameter transformation based on psychophysical models (such as power law relationships) to convert the linear blending parameter into a non-linear feedback parameter that aligns with human sensory perception. This ensures that equal changes in control sharing produce perceptually equal changes in feedback intensity, improving perception accuracy while maintaining reasonable implementation complexity through established mathematical models.
3Loss of information
If no psychophysical model is used, then the feedback system is simpler, but the sensory feedback does not accurately reflect the blending parameter to the operator
Solution Approach 1:
The patent implements a closed-loop feedback mechanism where the blending parameter is continuously transformed into psychophysically optimized feedback signals that are presented to the operator through haptic, visual, or thermal modalities. This feedback loop ensures that the operator receives accurate information about the current control sharing state, with the feedback intensity proportional to the actual control distribution, reducing information loss despite increased system complexity.
Data Source
AI summary
System, methods, and other embodiments described herein relate to communicating a blending parameter. In one embodiment, a method includes obtaining a blending parameter that is indicative of a degree to which control of a vehicle is shared between an operator of the vehicle and an advanced driver-assistance system (ADAS) of the vehicle. The method further includes determining a feedback parameter based upon the blending parameter and a psychophysical model, wherein the psychophysical model optimizes a relationship between the blending parameter and the feedback parameter such that sensory feedback based upon the feedback parameter is perceived to be proportional to the blending parameter. The method further includes causing a feedback modality of a steering apparatus of the vehicle to provide the sensory feedback based upon the feedback parameter.