On-Board Unit Speed Control for Low-Penetration V2X Traffic
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Solution Overview
Problem
Current vehicle-to-everything (V2X) systems for cooperative adaptive cruise control assume all vehicles are equipped with wireless communication, which is not always the case, leading to ineffective congestion mitigation due to low penetration rates of connected vehicles.
Innovation Solution
A vehicle on-board unit equipped with a communication system and an electronic controller that determines a travel path and target vehicle speed for a host vehicle based on travel information from preceding vehicles equipped with two-way wireless communication, disregarding non-connected neighboring vehicles, and calculates an average speed of connected preceding vehicles to set a target speed for the host vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V2X systems assume all vehicles are equipped with wireless communication, then cooperative adaptive cruise control can be implemented, but the system becomes ineffective when penetration rates are low
Solution Approach 1:
The patent introduces an intermediary mechanism where the host vehicle selectively receives travel information only from preceding vehicles equipped with wireless communication, rather than assuming all vehicles are connected. This intermediary filtering approach allows the system to function effectively even when only a portion of vehicles are equipped with V2X communication, resolving the contradiction between reliability and penetration rate tolerance.
2Reliability
If the system requires high penetration rates of connected vehicles, then congestion mitigation can be effective, but early adoption is discouraged
Solution Approach 1:
The patent implements partial action by allowing the cooperative adaptive cruise control system to operate with only a subset of vehicles equipped with wireless communication. Instead of requiring full penetration for system functionality, the host vehicle can determine target speeds based on travel information from the predetermined group of preceding vehicles that are connected, enabling the system to work effectively at lower penetration rates and thus encouraging early adoption.
3Loss of information
If travel information is received from all preceding vehicles, then more data is available for speed determination, but non-connected vehicles cannot provide wireless communication data
Solution Approach 1:
The patent applies local quality by creating a predetermined group of preceding vehicles from which travel information is received, rather than attempting to uniformly communicate with all preceding vehicles. This localized approach allows the system to selectively obtain travel information from vehicles that can provide it (those with wireless communication) while accepting that vehicles outside this group cannot contribute data, thus resolving the contradiction between information completeness and communication compatibility.
Data Source
AI summary
A vehicle on-board unit for a host vehicle comprises a communication system and an electronic controller. The communication system is programmed to electronically receive travel information from one or more preceding vehicles that are traveling ahead of the host vehicle in a lane. The electronic controller includes a vehicle path determination component programmed to determine a travel path of the host vehicle in the lane in which the host vehicle is currently traveling. The electronic controller further includes a target vehicle speed determination component programmed to determine a target vehicle speed for the host vehicle based on the travel information received from the one or more preceding vehicles. The travel information includes traveling speed of a predetermined group of preceding vehicles.