Coordinated OBD Testing in Vehicle Platoons
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Solution Overview
Problem
On-board diagnostic (OBD) tests in vehicles are often delayed or performed sparingly due to stringent prerequisite conditions, which can lead to inefficiencies and increased risks of test abortion due to changing conditions.
Innovation Solution
A system where a lead vehicle in a platoon communicates with following vehicles to synchronize and initiate OBD tests based on predicted conditions, allowing tests to be conducted even if prerequisite conditions are not met, by overriding or modifying the entry conditions through vehicle-to-vehicle communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OBD tests are performed frequently, then diagnostic coverage is improved, but test reliability deteriorates due to failing prerequisite conditions
Solution Approach 1:
The lead vehicle performs OBD tests in advance and communicates results to following vehicles, allowing them to skip redundant tests even when conditions aren't met. This preliminary testing approach enables following vehicles to maintain diagnostic coverage without requiring their own prerequisite condition checks, thus resolving the contradiction between test frequency and reliability.
Solution Approach 2:
The system copies test results from the lead vehicle to following vehicles through V2V communication. Instead of each vehicle independently performing tests subject to their own condition checks, the test information is copied and shared across the platoon, enabling frequent diagnostic coverage while maintaining reliability through the lead vehicle's successful test execution.
2Measurement precision
If stringent prerequisite conditions are enforced, then test accuracy is improved, but test opportunity deteriorates
Solution Approach 1:
The system merges the testing function across multiple vehicles by designating a lead vehicle to perform tests on behalf of the entire platoon. This consolidation allows the platoon to achieve diagnostic accuracy through one vehicle's rigorous testing while dramatically increasing test opportunities for all vehicles through result sharing, resolving the contradiction between accuracy and opportunity.
Solution Approach 2:
V2V communication acts as an intermediary mechanism that transfers test results from the lead vehicle to following vehicles. This intermediary system enables following vehicles to access accurate diagnostic information without needing to independently satisfy stringent prerequisite conditions, thus increasing test opportunities while maintaining diagnostic accuracy.
3Ease of operation
If each vehicle performs independent OBD tests, then test autonomy is improved, but platoon coordination deteriorates
Solution Approach 1:
The testing function is segmented between lead vehicle and following vehicles. The lead vehicle maintains full testing autonomy by independently evaluating its own prerequisite conditions and executing tests, while following vehicles adopt a coordinated role by receiving and utilizing the lead vehicle's results. This segmentation preserves autonomy where needed while reducing coordination complexity through clear role differentiation.
Data Source
AI summary
A vehicle computer is communicatively coupled to a portable computing device and is programmed to determine, in a lead vehicle, that one or more conditions for a diagnostic test, such as an onboard diagnostic (OBD) test, are met and to send a vehicle-to-vehicle message to one or more following vehicles at a specified time. The sent message provides data to indicate to each following vehicle to perform the test at a specified time. The vehicle computer is further programmed to perform the test in the lead vehicle at the specified time.