Cooperative Adaptive Cruise Control Vehicle Length Verification
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Solution Overview
Problem
Current Cooperative Adaptive Cruise Control (CACC) systems face challenges in efficiently and reliably determining vehicle length for platooning, which can lead to unsafe connections and inefficient traffic flow due to inaccuracies in sensor data and lack of real-time vehicle information.
Innovation Solution
A method utilizing V2V communication to detect and verify the length of preceding vehicles by comparing sensor-determined lengths with shared data, employing a difference threshold value and target identification procedures to ensure accurate connection establishment, and storing length information for future reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor data (radar, laser, camera) is used to determine vehicle length and distance, then the system can operate without V2V communication infrastructure, but the measurement precision and reliability of vehicle length determination deteriorates due to inaccuracies and lack of real-time information
Solution Approach 1:
The patent combines sensor data from the subject vehicle with V2V communication data from the preceding vehicle to determine vehicle length. The control unit integrates multiple information sources (sensor measurements of distance and GPS positions, plus V2V shared data) to calculate and verify vehicle length, thereby improving measurement precision by merging complementary data sources
Solution Approach 2:
The system uses V2V communication to share vehicle length information between preceding and subject vehicles. The subject vehicle receives length information from the preceding vehicle via V2V communication and uses this feedback to verify its own calculations, improving the reliability and accuracy of vehicle length determination
2Reliability
If GPS positions and radar measurements are used to calculate vehicle length, then the procedure can be implemented with existing sensors, but the reliability of connection establishment deteriorates due to potential inaccuracies and inability to verify target identity
Solution Approach 1:
The system performs preliminary verification of the preceding vehicle's identity by comparing the calculated vehicle length from sensor data with the length information received via V2V communication before establishing the platoon connection. This preliminary check ensures reliability by confirming that the target vehicle matches the detected vehicle, preventing incorrect connections
Solution Approach 2:
The patent replaces purely sensor-based vehicle identification with a hybrid system that uses V2V communication for verification. Instead of relying solely on mechanical/sensor measurements which can be ambiguous, the system substitutes in communication-based data exchange to confirm vehicle identity and length, thereby improving connection reliability
3Ease of operation
If simple platooning procedures are used, then the ease of operation improves, but the safety level deteriorates due to insufficient verification of vehicle identity and length
Solution Approach 1:
The system enables the subject vehicle to automatically verify the preceding vehicle's identity and length information through automated comparison of calculated and communicated data. The control unit performs self-verification by checking consistency between sensor-based calculations and V2V shared information, providing simple yet safe automated operation without requiring manual intervention
Solution Approach 2:
The system implements a verification step that goes beyond simple distance measurement by also checking vehicle length consistency. This partial additional verification (comparing length information in addition to distance) maintains ease of operation while significantly improving safety by ensuring correct target identification before connection
Data Source
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AI summary
The invention provides to a method for Cooperative Adaptive Cruise Control (CACC) with vehicle-to-vehicle (V2V) communication, the method comprising - a subject vehicle determining (S2), by means of a length determination procedure, an assumed length (Las) of a communicating vehicle travelling ahead of the subject vehicle, - the method further comprising, if length information about the length (L1) of the communicating vehicle is available (S3) to the subject vehicle, the length information being obtained in a way that is different from said length determination procedure, the subject vehicle comparing (S4) the assumed length with the length according to the length information, and connecting (S5) to the communicating vehicle if the assumed length (Las) differs from the length (L1) according to the length information by less than a difference threshold value.