Airflow Valve Diagnostic System for Engine Reliability
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Solution Overview
Problem
Existing airflow control systems for internal combustion engines lack an effective method to diagnose valve system degradation, particularly in movable linkage members, which can lead to improper valve operation despite the motor appearing to function within tolerance.
Innovation Solution
A diagnostic method and apparatus that determines if a valve is in a stable position, commands the valve to move from one position to another, and measures the time and distance of this movement, providing signals based on predetermined thresholds to indicate normal or abnormal operation, utilizing a microprocessor and position feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is monitored for operational tolerance, then the motor function is maintained, but the linkage member degradation cannot be detected
Solution Approach 1:
The system uses feedback from position sensors to monitor the actual valve position and compares it against expected position ranges. This feedback mechanism enables detection of linkage member degradation by identifying when the valve fails to reach expected positions, thereby resolving the contradiction between maintaining motor function and detecting linkage degradation.
Solution Approach 2:
The patent introduces an intermediary diagnostic system that acts as a mediator between the motor and valve. This intermediary layer monitors the relationship between commanded valve positions and actual positions, detecting degradation in the linkage members without requiring direct monitoring of the linkage itself.
2Reliability
If the valve movement time is not monitored, then the system operation is simple, but valve system degradation cannot be diagnosed
Solution Approach 1:
The system implements feedback by continuously monitoring the time required for the valve to move between positions and comparing it against predetermined acceptable ranges. This feedback mechanism enables degradation detection through timing variations while maintaining relatively simple system architecture using existing position sensors and control logic.
3Difficulty of detecting and measuring
If position sensors are added to monitor valve position, then valve operation can be diagnosed, but the device complexity increases
Solution Approach 1:
The system uses self-service by leveraging existing position sensors that are already part of the valve control system to perform diagnostic functions. Rather than adding entirely new sensing infrastructure, the patent repurposes existing sensors to monitor valve position and movement characteristics, thereby enabling diagnosis without proportionally increasing device complexity.
Data Source
AI summary
An apparatus and method for diagnosing an airflow control system of an internal combustion engine, the method comprising: determining if a valve is in a stable position; commanding the valve of the airflow control system to move from a first position to a second position; determining a period of time for the valve to move from the first position to the second position; providing a first signal if the period of time is greater than or less than a predetermined period of time, the predetermined period of time corresponding to an amount of time necessary to move the valve from the first position to the second position under predetermined conditions; and providing a second signal if the period of time is within a range defined by the predetermined period of time.