Fuel Pump Diagnostic Apparatus for Impeller Swelling Detection
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Solution Overview
Problem
Fuel pumps face issues due to impeller swelling, which reduces clearance and can lead to interference with the pump chamber, potentially causing the pump to stop, and existing solutions do not effectively determine the state of the fuel pump in actuation.
Innovation Solution
A diagnostic apparatus that uses processing circuitry to diagnose the state of the fuel pump by correlating pump rotational speed and fuel pressure, establishing a reference range to detect anomalies such as impeller swelling or wear before the pump stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clearance between the impeller and pump chamber wall is reduced to improve pump efficiency, then the pump performance is improved, but the impeller may interfere with the pump chamber wall due to swelling, causing the pump to stop
Solution Approach 1:
The diagnostic apparatus performs preliminary detection of impeller swelling by monitoring the correlation between pump rotational speed and fuel pressure during initial actuation. This allows early identification of swelling trends before the clearance becomes insufficient and causes pump stoppage, enabling preventive maintenance or operational adjustments.
Solution Approach 2:
The system continuously monitors the correlation between pump rotational speed and fuel pressure, comparing actual values against reference ranges. When deviations indicate impeller swelling, the system provides feedback to alert operators or adjust operations, creating a closed-loop monitoring system that maintains reliable operation while allowing high efficiency.
2Reliability
If the clearance between the impeller and pump chamber wall is increased to prevent interference and ensure continuous operation, then the pump reliability is improved, but the pump efficiency decreases
Solution Approach 1:
Instead of using a fixed clearance design, the system dynamically monitors the actual clearance condition through correlation analysis of operational parameters. This allows the system to adapt to changing impeller dimensions over time, maintaining optimal efficiency while preventing interference through continuous detection and early warning.
Solution Approach 2:
The diagnostic apparatus detects impeller swelling in advance by analyzing correlations during initial actuation and ongoing operation. This preliminary detection enables operators to take preventive actions before the clearance becomes critically small, allowing the pump to maintain smaller clearances for higher efficiency without risking stoppage.
3Device complexity
If the fuel pump operates without diagnostic monitoring to simplify the system, then the device complexity is reduced, but the ability to detect impeller swelling and prevent pump stoppage is lost
Solution Approach 1:
The diagnostic apparatus utilizes existing operational parameters (pump rotational speed and fuel pressure) that are already measured for normal pump control. By analyzing the correlation between these existing measurements, the system performs self-diagnosis without requiring additional sensors or complex external monitoring equipment, maintaining simplicity while enabling reliable detection.
Solution Approach 2:
The same sensors and measurement systems used for normal pump operation and fuel delivery control are also used for diagnostic monitoring of impeller swelling. This multi-functional use of existing components enables reliable detection capability without adding separate dedicated diagnostic hardware, keeping the system simple while improving reliability.
Data Source
AI summary
A diagnostic apparatus for a fuel pump diagnoses the state of a fuel pump based on: a correlation between a pump rotational speed that is a rotational speed of the motor and fuel pressure that is pressure of the fuel discharged from the fuel pump; and an initial correlation that is the correlation in an initial actuation period from when the fuel pump is energized for the first time to when a specified period has elapsed.