Forward Vehicle Deceleration Detection in Rain and Low Light
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Solution Overview
Problem
Existing deceleration detection systems for forward vehicles face challenges in accurately detecting deceleration due to weather conditions and external light, which affects the accuracy of sensor fusion using radar, LiDAR, and cameras.
Innovation Solution
A deceleration detection apparatus that includes an object detection device, a rainfall detection device, and a brightness detection device, using a microprocessor to determine deceleration based on vehicle speed changes, brake lamp lighting, rainfall state, and ambient brightness, with adjustable thresholds for varying weather and lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor fusion using radar and camera is used to detect forward vehicle, then object recognition capability is improved, but measurement precision of deceleration deteriorates due to weather and external light influence
Solution Approach 1:
The patent introduces brake lamp detection as an intermediary indicator to infer deceleration. Instead of directly measuring deceleration through sensors affected by weather and light, the system detects the brake lamp state (on/off) as a reliable proxy signal that is not influenced by environmental conditions, thereby resolving the contradiction between object recognition capability and deceleration measurement precision
Solution Approach 2:
The patent replaces direct physical measurement of deceleration (mechanical/sensor-based) with optical signal detection (brake lamp state). By substituting the mechanical deceleration measurement system with an optical detection system that observes brake lamp illumination, the system achieves deceleration detection that is immune to weather and external light interference
2Measurement precision
If multiple detection devices (object, rainfall, brightness) are integrated, then deceleration detection accuracy under adverse conditions is improved, but device complexity increases
Solution Approach 1:
The patent makes the object detection device multi-functional by having it perform both forward vehicle detection and brake lamp state detection. This allows the system to use existing detection resources for multiple purposes, improving deceleration detection accuracy without proportionally increasing device complexity
Solution Approach 2:
The patent combines the detection functions of the object detection device to simultaneously extract both vehicle position information and brake lamp state information. By merging these detection functions into a single integrated process, the system achieves improved measurement precision while minimizing the increase in device complexity
Data Source
AI summary
A deceleration detection apparatus including an object detection device that detects an object around a subject vehicle, a rainfall detection device that detects a rainfall state around the subject vehicle, a brightness detection device that detects a brightness around the subject vehicle, and an electronic control unit including a microprocessor and a memory connected to the microprocessor. The microprocessor is configured to perform determining whether a forward vehicle traveling in front of the subject vehicle decelerates, based on an amount of change in a vehicle speed of the forward vehicle detected by the object detection device, a lighting state of a brake lamp of the forward vehicle detected by the object detection device, the rainfall state detected by the rainfall detection device, and the brightness detected by the brightness detection device.