Steer-by-Wire Feedback Actuator Automation Awareness
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Solution Overview
Problem
In vehicles with steer-by-wire steering systems, there is a challenge in providing drivers with clear and intuitive feedback about the level of automation, which is crucial for building confidence and ensuring safe operation.
Innovation Solution
A method that uses a feedback actuator, such as a steering wheel actuator, to generate signals that provide the driver with haptic feedback about the vehicle's operating state and the level of automation, allowing for a clear distinction between different automation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a steer-by-wire steering system operates at high automation levels (L3+), then the system can perform driving functions independently, but the driver may lose awareness of the automation level and their responsibility boundary
Solution Approach 1:
The patent implements feedback mechanisms through haptic actuators that provide tactile signals to the driver, auditory signals through speakers, and visual signals through displays. These feedback channels continuously inform the driver about the current automation level and system status, preventing information loss while maintaining high automation operation.
Solution Approach 2:
The patent segments the feedback information into distinct channels (haptic, auditory, visual) and distinct types (automation level indication, system status, responsibility boundary). This segmentation ensures that critical information about automation level is delivered through multiple independent channels, preventing any single channel failure from causing complete information loss.
2Loss of information
If the system provides continuous feedback to the driver, then the driver maintains awareness of the system state, but the feedback may become distracting or overwhelming
Solution Approach 1:
The patent employs periodic feedback rather than continuous feedback, where haptic, auditory, and visual signals are provided at strategically timed intervals or triggered by specific events. This periodic action maintains driver awareness of automation level while preventing constant stimulation that would increase workload and cause distraction.
Solution Approach 2:
The patent applies different feedback qualities to different information types and driver states. For example, haptic feedback with specific vibration patterns indicates automation level changes, while subtle visual cues provide status updates. The feedback intensity and modality are adapted to the current driving context and driver attention state, ensuring awareness without overwhelming the driver.
Data Source
AI summary
A method is for operating a steer-by-wire steering system in a vehicle. The steer-by-wire steering system includes a feedback actuator associated with a steering handle and a steering actuator. During operation of the vehicle, a first signal, which carries operational state information, is generated and transmitted to the steering handle via the feedback actuator as feedback to the driver. The method also includes generating a second signal, that carries information regarding the driver's responsibility for the operation. The second signal is also transmitted to the steering handle by the feedback actuator as feedback to the driver.