Fuel Pump Motor Abnormality Detection via Control Failure Frequency
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Solution Overview
Problem
The detection accuracy of abnormalities in fuel pump motors is low due to difficulty in specifying the cause of increased torque, which can be attributed to foreign matter or impeller interference, leading to inefficient identification of motor issues.
Innovation Solution
A motor control device with a rotation control determination unit, parameter calculation unit, and abnormality determination unit that calculates a control failure frequency parameter to identify motor rotation control failures and determine abnormalities, including foreign matter or impeller interference, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motor current value, motor voltage value, and motor rotation speed are compared with predetermined determination threshold values, then abnormality detection is performed, but the detection accuracy of abnormalities in fuel pump motors is low due to difficulty in specifying the cause of increased torque
Solution Approach 1:
The patent changes the detection parameter from simple threshold comparison of motor current, voltage, and rotation speed to a more sophisticated parameter that evaluates the relationship between motor output and fuel pump performance. This includes monitoring fuel pump rotation speed, calculating motor output based on current and voltage, and determining abnormalities when the motor output is insufficient relative to the fuel pump's operational requirements, thereby improving detection accuracy and cause identification
Solution Approach 2:
The patent introduces an intermediary evaluation mechanism that assesses the relationship between motor output and fuel pump performance rather than directly detecting the cause of increased torque. By calculating motor output from current and voltage measurements and comparing it with the fuel pump's rotational requirements, the system indirectly identifies abnormalities and their causes without directly measuring torque
2Measurement precision
If simple threshold comparison is used for motor current, voltage, and rotation speed, then the control device remains simple, but the detection accuracy of abnormalities is low
Solution Approach 1:
The patent makes the control device multi-functional by enabling it to perform both simple threshold monitoring and sophisticated abnormality analysis using the same hardware components. The control device can operate in different modes: basic threshold comparison for simple faults and advanced motor output calculation with fuel pump performance evaluation for accurate abnormality detection, thereby improving detection accuracy without proportionally increasing device complexity
Solution Approach 2:
The patent implements parameter changes that allow the control device to transition from simple threshold monitoring to complex abnormality analysis. By calculating motor output from existing current and voltage measurements and comparing it with fuel pump rotational requirements, the system achieves high detection accuracy using the same hardware, avoiding the need for additional complex components
Data Source
AI summary
A motor control device includes: a rotation control determination unit configured to determine whether a motor rotation control to rotate the motor fails; a parameter calculation unit configured to calculate a control failure frequency parameter having a correlation with a frequency of failure in the motor rotation control based on a determination result by the rotation control determination unit; and an abnormality determination unit configured to determine whether an abnormality has occurred in the motor based on the control failure frequency parameter.