In-Vehicle Ultrasonic Obstacle Detection Threshold Adjustment
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Solution Overview
Problem
In-vehicle monitoring systems using ultrasonic distance sensors face challenges in accurately detecting obstacles regardless of distance and vehicle direction, leading to false detections and time lags due to varying signal strengths and noise interference.
Innovation Solution
An in-vehicle monitoring system with an adjustment unit that dynamically adjusts the threshold for object detection based on measured distance, using a combination of an object detector, measurement unit, and judgment unit to stabilize obstacle detection and reduce false alarms by adjusting the threshold according to changing distances and noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of measurements for detecting an obstacle is increased, then detection precision is improved, but time lag increases
Solution Approach 1:
The patent applies dynamics by making the measurement threshold variable rather than fixed. The threshold is dynamically adjusted based on the detected distance to the obstacle: when distance is short, threshold is lowered to reduce measurements and time lag; when distance is long, threshold is raised to ensure detection precision. This resolves the contradiction by adapting the measurement strategy to the specific operational context.
2Loss of time
If the number of measurements for detecting an obstacle is decreased, then time lag is reduced, but false detection increases
Solution Approach 1:
The patent changes the parameter of measurement threshold based on distance conditions. By adjusting this parameter dynamically, the system reduces measurements (and time lag) when obstacles are near while maintaining high measurement counts (and reliability) when obstacles are far away. This parameter adaptation resolves the contradiction between speed and reliability.
3Device complexity
If a fixed threshold is used for object detection, then device complexity is reduced, but detection stability varies with distance
Solution Approach 1:
The patent introduces dynamics into the threshold setting mechanism. Instead of a fixed threshold, the system automatically adjusts the threshold based on measured distance to the obstacle. This dynamic adaptation maintains detection stability across varying distances while adding only minimal computational complexity to the system.
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
The system effectively reduces time lag and false detections by dynamically adjusting the threshold, ensuring stable obstacle detection across varying distances and vehicle directions, while minimizing the impact of noise and interference.
Implementation Method 1
The ultrasonic distance sensor is configured: to transmit an ultrasonic sound through a transducer (transceiver); to receive the ultrasonic sound (reflected waves) reflected by an object (an obstacle) at the periphery of a vehicle through the transducer; and to measure the distance to the object based on receiving of the reflected waves.
Implementation Method 2
to receive the ultrasonic sound (reflected waves) reflected by an object (an obstacle)
Data Source
AI summary
An in-vehicle monitoring system is configured to determine the presence of an object when the number of continuous generations of an object detection signal obtained in connection with a transmission signal reaches a threshold. The in-vehicle monitoring system comprises an adjustment unit configured to decrease the threshold if the distance obtained from a transmission signal and an object detection signal decreases.