Vehicle Entry Authentication With Illuminance-Based Sensor Switching
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Solution Overview
Problem
Existing vehicle authentication systems consume excessive power due to continuous operation of high-accuracy cameras and illuminance sensors, making it inefficient in dark environments.
Innovation Solution
An entry system that selectively uses a ranging sensor or a low-power camera based on ambient illuminance to authenticate users, switching to a high-resolution camera only when illuminance is sufficient, and employing a radar for object detection in dark conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-accuracy camera is continuously operated for user authentication, then authentication accuracy is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between different sensor types (ranging sensor, low-power camera, high-accuracy camera) based on real-time illuminance conditions. In dark environments, the high-accuracy camera remains inactive while ranging sensors and low-power cameras perform detection, avoiding unnecessary power consumption. When illuminance is sufficient, the system transitions to using the high-accuracy camera for authentication, optimizing the balance between performance and energy usage.
Solution Approach 2:
The system changes operational parameters by selecting different sensors based on illuminance levels. The control unit adjusts which sensor is active (ranging sensor vs. camera types) according to lighting conditions, effectively changing the system's operational state to match environmental parameters and avoid wasteful energy consumption.
2Measurement precision
If illuminance sensors and power-saving cameras operate continuously to detect dark environments, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
Instead of continuous operation, the system employs periodic or event-driven sensing. The power-saving camera and illuminance sensor operate only when triggered by motion detection or at specific intervals, rather than continuously. This periodic operation maintains detection capability while significantly reducing overall power consumption during extended idle periods.
3Reliability
If multiple sensors are used simultaneously for object detection and authentication, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The system segments the detection function across multiple sensor types, each optimized for specific conditions. Ranging sensors handle dark environment detection, low-power cameras handle initial object detection, and high-accuracy cameras handle authentication when conditions permit. This segmentation allows the system to maintain high reliability through multiple sensors while managing complexity by assigning specific roles to each sensor type.
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
Effectively authenticates users while minimizing power consumption by optimizing sensor usage based on lighting conditions, ensuring efficient operation in both bright and dark environments.
Implementation Method 1
a ranging sensor that detects an object within a range of a prescribed distance from the moving body
Implementation Method 2
measures illuminance around the moving body when an object which has entered a range of a prescribed distance from the moving body is detected
Data Source
AI summary
An entry system includes: a detection unit configured to detect a target person approaching a moving body; and an authentication unit configured to authenticate that the target person is a registered user based on a face image of the target person, and the detection unit measures illuminance around the moving body when an object which has entered a range of a prescribed distance from the moving body is detected, and selects a sensor to be used to determine whether or not the object is the target person according to the illuminance.