Blind Spot Radar Speed Sensing Without CAN Bus Integration
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Solution Overview
Problem
Conventional blind spot detection systems require a separate speed detection mechanism and connection to the vehicle's central control system, making them complex and costly to install, especially on motorcycles, where tire diameters vary, leading to frequent false alarms and limited applicability.
Innovation Solution
A blind spot detection system with integrated speed detection function, using a signal transceiving module and central processing unit to calculate relative speed and determine vehicle speed, eliminating the need for external speed signal capture and simplifying installation by allowing placement on various vehicle locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the blind spot detection system is connected to the vehicle's central control system to acquire speed signals, then the speed detection accuracy is improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent combines the speed detection function within the blind spot detection system itself by using the radar signal processing capability to calculate relative speed between the vehicle and static objects. This merging eliminates the need for separate speed detection mechanisms and CAN bus connections, reducing installation complexity while maintaining speed detection accuracy through the formula: vehicle speed = relative speed with respect to static object
Solution Approach 2:
The radar signal transceiving module performs multiple functions: it detects blind spot objects, calculates relative speed of objects, and determines vehicle speed by referencing the static object's speed. This multi-functionality eliminates the need for separate speed sensing mechanisms, simplifying the overall system while improving adaptability across different vehicle types
2Measurement precision
If the blind spot detection system uses tire rotation detection to determine vehicle speed, then the speed detection function is achieved, but the adaptability to different vehicle models decreases due to varying tire diameters
Solution Approach 1:
The patent replaces the mechanical tire rotation detection system with a radar-based electromagnetic detection system. The radar calculates vehicle speed by measuring the relative speed between the vehicle and static objects (like road surfaces or roadside objects) using Doppler effect and signal processing, eliminating the need for mechanical connections to tires and making the system universally applicable to all vehicle types regardless of tire specifications
3Reliability
If the blind spot detection system is installed on the rear bumper requiring removal and reinstallation, then the detection position is optimized, but the ease of installation deteriorates
Solution Approach 1:
The patent segments the blind spot detection system into a standalone modular unit that can be independently installed on various vehicle surfaces (rear bumper, rear windshield, trunk lid) without requiring removal or integration with the vehicle's central control system. This modular segmentation allows flexible installation positions while maintaining detection effectiveness and simplifying the installation process
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
Enables accurate blind spot detection and collision prevention without connecting to the vehicle's CAN bus, reducing installation complexity and cost, and facilitating use on motorcycles by determining vehicle speed through relative speed calculations, thus enhancing installation convenience and reducing false alarms.
Implementation Method 1
The signal transceiving module sends a first signal toward a detection area behind the vehicle, and acquires a second signal reflected by an object in the detection area
Implementation Method 2
acquires a second signal reflected by an object in the detection area
Implementation Method 3
The speed calculation module calculates the relative speed between the object in the detection area and the vehicle for identifying the static object and a moving object, and determines the speed of the vehicle based on the relative speed between the vehicle and the static object
Data Source
AI summary
A blind spot detection system with speed detection function and device and method thereof are provided. The system is disposed on the rear portion of the vehicle, and includes a signal transceiving module and a central processing unit. The central processing unit includes a speed calculation module and an object detection module. The device includes a main body in which the signal transceiving module is disposed. A first signal is sent toward a detection area behind the vehicle for acquiring a second signal for blind spot detection. By calculation based on the second signal, a third signal is acquired for identifying the static and moving objects, and the relative speed between the vehicle and the static object is determined as the speed of the vehicle. Therefore, the blind spot detection system has a speed detection function.