Capacitance Steering Wheel Grip Detection for Autonomous Vehicles
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Solution Overview
Problem
Autonomous vehicles face challenges in rapidly transferring driving control to a driver during unexpected situations, such as when the driver is asleep or distracted, due to the lack of immediate grip detection on the steering wheel, which can lead to accidents.
Innovation Solution
A grip detection system for the steering wheel of autonomous vehicles, comprising a contact detector with a capacitance-based sensor that includes an electrode and a dielectric material, capable of detecting changes in capacitance and generating warning signals when the driver is not gripping the wheel, and an emergency mode that can initiate vehicle parking or stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional autonomous system uses induction functions to prompt driver grip, then the system can alert the driver, but the driver cannot rapidly respond if asleep or distracted, leading to safety risks
Solution Approach 1:
The system performs preliminary detection of driver grip status before unexpected situations occur. The contact detector continuously monitors whether the driver is gripping the steering wheel, and the system prepares for rapid mode switching by having the manual/autonomous mode switch ready to activate immediately when needed, rather than inducing grip after a problem occurs
Solution Approach 2:
The system implements continuous feedback by periodically checking driver grip status through the contact detector. This real-time monitoring provides immediate information about driver readiness, allowing the system to detect when the driver is not gripping and trigger appropriate warnings or mode switches without delay
2Length of stationary object
If the steering wheel integrates both capacitance detection and hot wire functions, then the thickness can be reduced, but the structural complexity increases
Solution Approach 1:
The patent combines multiple functions (capacitance detection and hot wire heating) into a single integrated steering wheel structure. The contact detector and hot wire are incorporated together in the steering wheel, allowing both grip detection and thermal comfort functions to coexist in one component rather than requiring separate systems
Solution Approach 2:
The steering wheel is designed with multi-functionality, serving both as a structural component and as an integrated sensor/heating system. The same steering wheel structure houses the capacitance detector for grip detection and the hot wire for heating, making it a universal component that performs multiple functions simultaneously
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
Enables rapid switching to manual mode by periodically checking driver engagement with the steering wheel, enhancing safety by reducing the risk of accidents in unexpected situations and potentially reducing the thickness of the steering wheel by integrating both capacitance detection and hot wire functions.
Implementation Method 1
a contact detector which is mounted on a steering wheel of the vehicle, and detects a change in capacitance due to contact between a driver and a steering wheel
Implementation Method 2
a dielectric which is stacked on the electrode, and amplifies the capacitance formed by the electrode
Data Source
AI summary
A grip detection system of a steering wheel for an autonomous vehicle, may include an autonomous driving portion which autonomously drives a vehicle; a contact detector which is mounted on a steering wheel of the vehicle, and detects a change in capacitance due to contact between a driver and a steering wheel; a control portion which determines that the driver contacts with the steering wheel if the change in capacitance is received from the contact detector, and generates a warning signal when determining that the driver does not contact with the steering wheel if the change in capacitance is not received from the contact detector; and an output portion which receives the warning signal, and outputs the warning signal to outside.