Ultrasonic Object Detection for Power Management
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Solution Overview
Problem
Current user detection technologies for power management, such as infrared ray sensors and image processing techniques, are inefficient in determining user presence and movement, leading to unnecessary power consumption in standby electronic appliances, and are costly to implement and maintain.
Innovation Solution
An ultrasonic object detection method that emits a series of ultrasonic signals, analyzes reflected signals to generate real-time and cumulative environment arrays, and updates a moving object array to determine user presence, movement, and direction, enabling efficient power mode switching in electronic appliances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared ray sensor is used to detect user movement, then user presence can be determined, but the distance to the user cannot be determined
Solution Approach 1:
The detection process is segmented into multiple stages: initial ultrasonic scanning to build environment map, continuous detection for object appearance, and tracking phases. This segmentation allows the system to separately handle presence detection and distance measurement, resolving the contradiction by dedicating specific detection phases to each function.
Solution Approach 2:
The system performs preliminary ultrasonic scanning to build an environment map before actual object detection begins. This preliminary action creates a baseline of the environment without objects, enabling subsequent detection to focus on changes from this baseline, thereby efficiently extracting both presence and distance information.
2Measurement precision
If image processing technique is used to detect user movement and distance, then both presence and distance can be determined, but hardware and software costs increase significantly
Solution Approach 1:
The patent replaces complex image processing systems with ultrasonic sensing technology. Instead of using cameras and sophisticated image analysis algorithms, the system uses ultrasonic waves and simple signal processing to achieve both presence and distance detection, significantly reducing hardware and software complexity while maintaining measurement precision.
Solution Approach 2:
The system changes the detection parameter from optical (image processing) to acoustic (ultrasonic). By using ultrasonic wave properties such as time of flight and echo characteristics, the system achieves distance and presence detection with simpler hardware compared to image processing requirements, resolving the contradiction between measurement capability and system complexity.
3Measurement precision
If ultrasonic signals are emitted continuously to detect objects, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The ultrasonic signals are emitted periodically rather than continuously. The system uses a time interval between successive ultrasonic emissions, allowing the sensor to remain inactive during intervals and consume minimal power. This periodic operation maintains detection accuracy through regular sampling while significantly reducing overall power consumption compared to continuous emission.
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 method effectively detects user presence and movement, allowing for accurate power management by transmitting relevant information to the power management module, thereby reducing energy waste and lowering hardware and software costs.
Implementation Method 1
emitting a plurality of ultrasonic signals sequentially according to a time interval, sensing a sound wave formed by each of the ultrasonic signals to generate a reflected signal
Data Source
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AI summary
An object detection method using ultrasonic waves includes: emitting a plurality of ultrasonic signals sequentially according to a time interval; sensing a sound wave formed by each of the ultrasonic signals to generate a reflected signal; and analyzing the reflected signal to detect at least one reflection object. It can be clearly known whether a reflection object is appearing, moving and the moving direction by the method.