Two-Stage Vehicle Approach Detection System
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Solution Overview
Problem
Existing vehicle approach detection systems require a transmitting unit carried by the user and consume excessive energy by continuously injecting signals, potentially harming users with magnetic and electric fields.
Innovation Solution
A two-stage detection system using optical or acoustic sensors for long-range detection, which automatically triggers capacitive sensors for close-range detection, eliminating the need for a user-carrying transmitter and reducing energy consumption by only activating energy-intensive operations when in close proximity to the display and operating unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signals are permanently injected into the user using capacitive sensors, then close-range detection is achieved, but excessive energy consumption and potential harm to users from magnetic and electric fields occurs
Solution Approach 1:
The detection process is segmented into two distinct stages: long-range detection using optical sensors and close-range detection using capacitive sensors. This segmentation allows the system to use low-energy optical detection for most of the time and only activate the high-energy capacitive sensors when a hand approach is detected, thereby resolving the contradiction between detection precision and energy consumption
Solution Approach 2:
The optical sensor performs preliminary detection at long range to identify potential hand approaches before activating the capacitive sensor. This preliminary action allows the system to prepare for close-range detection only when necessary, minimizing unnecessary energy consumption while maintaining detection precision
2Measurement precision
If signals are permanently injected into the user using capacitive sensors, then close-range detection is achieved, but harmful magnetic and electric fields are exposed to users
Solution Approach 1:
The detection system is divided into two stages with different sensor types. The optical sensor handles long-range detection without exposing users to harmful fields, while the capacitive sensor is activated only for brief close-range detection when needed, minimizing harmful field exposure while maintaining detection precision
Solution Approach 2:
Instead of continuous signal injection, the capacitive sensor operates periodically only when triggered by the optical sensor detecting a hand approach. This periodic activation reduces the duration of harmful field exposure while maintaining adequate detection precision
3Reliability
If a transmitting unit is required at the user end, then approach detection can be triggered, but device complexity and user convenience are reduced
Solution Approach 1:
Instead of requiring a transmitting unit in the user's hand to initiate detection, the system inverts the approach by using passive optical sensors to detect the hand's approach and automatically trigger capacitive sensing. This inversion eliminates the need for additional user equipment while maintaining reliable detection
Solution Approach 2:
The detection system serves itself by using the hand's natural movement and reflection properties detected by optical sensors to automatically activate the capacitive sensing stage. No external transmitting unit is needed as the system self-triggers based on optical detection of approach
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
This approach allows for energy-efficient and user-safe detection of hand or arm movements, minimizing signal injection into the human body and enabling timely adaptation of the display and operating concept without the need for a code transmitter, thus reducing latency and enhancing user interaction.
Implementation Method 1
The first detection stage may be carried out using reflection infrared light barriers
Implementation Method 2
The second detection stage comprises close-range detection by injecting and outputting signals using a capacitive sensor
Implementation Method 3
The sensors in the first detection stage may be reflection infrared light barriers or ultrasonic sensors
Data Source
AI summary
A detection system for the approach recognition of a hand or arm movement in the direction a display or control unit. The detection takes place in two stages by way of long-range detection and close-range detection. The first stage detects using at least one optical or acoustic sensor.