Off-Board Vehicle Fault Detection Using Residual Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
On-board vehicle monitoring systems are constrained by memory, communication, and resource limitations, leading to reactive fault diagnosis that only occurs after vehicle performance has been compromised, lacking proactive fault detection and isolation capabilities.
Innovation Solution
An off-board monitoring scheme that calculates residuals based on expected and observed parameters to determine subsystem operating signatures, isolates faults, and communicates fault information back to the vehicle, utilizing wireless communication and residual equations to develop a fault isolation matrix for real-time analytical support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If on-board monitoring systems are used with available memory and communication resources, then fault detection can be performed on the vehicle, but the system cannot provide proactive fault isolation due to resource constraints
Solution Approach 1:
The monitoring system is segmented into on-board and off-board components. The on-board controller collects data and transmits it to an off-board system that performs complex fault isolation analysis, dividing the computational workload according to available resources at each location.
Solution Approach 2:
A communication interface acts as an intermediary between the on-board controller and off-board monitoring system, enabling the transfer of operational data and fault information while allowing the vehicle to leverage external computational resources without increasing on-board complexity.
2Ease of repair
If reactive diagnosis is performed after vehicle performance is compromised, then fault location can be identified, but vehicle performance is already degraded by the time diagnosis occurs
Solution Approach 1:
The off-board monitoring system continuously analyzes operational data and detects faults before they cause performance degradation. By performing analysis in advance and communicating fault information back to the vehicle, the system enables preventive maintenance before actual failures occur.
Solution Approach 2:
The system establishes a feedback loop where off-board analysis results are communicated back to the on-board controller, which then provides real-time fault information to the driver or maintenance system, enabling timely intervention based on continuous monitoring and analysis.
Data Source
AI summary
A method for monitoring a subsystem of a subject vehicle includes, in an off-board environment, executing a controller-based scheme. The scheme includes determining a plurality of residuals based upon expected and observed states of parameters associated with operation of the subsystem, determining a subsystem operating signature based upon the residuals, employing the subsystem operating signature to isolate a subsystem fault, and communicating the subsystem fault to an on-board controller of the subject vehicle.