Fuel Pump Motor Control for Abnormality Detection and Stop Suppression
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Solution Overview
Problem
Existing motor control systems fail to reliably prevent the motor from stopping due to abnormalities such as foreign matter obstruction or interference within the fuel pump impeller, leading to potential fuel supply disruptions.
Innovation Solution
A motor control device with a rotation control determination unit, parameter calculation unit, and stop suppression unit that monitors motor rotation control failures and adjusts motor control parameters to prevent motor stoppage by changing parameters like proportional gain, integral gain, target rotation speed, and starting duty to maintain motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor rotation control is performed with fixed parameters, then the control system is simple and easy to operate, but the motor stops when abnormalities occur such as foreign matter obstruction
Solution Approach 1:
The patent applies dynamics by making the control parameters changeable rather than fixed. The control parameter changing unit dynamically adjusts motor control parameters (such as current limits, PWM duty cycles, or protection thresholds) based on real-time detection of abnormal conditions like foreign matter obstruction, allowing the system to adapt to varying operational states and prevent motor stoppage while maintaining manageable complexity through automated adjustment.
Solution Approach 2:
The patent directly implements parameter changes by modifying motor control parameters in response to detected abnormalities. When the rotation control determination unit detects issues such as foreign matter obstruction or interference within the fuel pump impeller, the control parameter changing unit adjusts parameters like current thresholds, voltage limits, or rotation speed targets to maintain motor operation under abnormal conditions, thereby improving reliability without requiring complex structural modifications.
2Reliability
If motor control parameters are adjusted to prevent stoppage, then motor operation continues during abnormality, but the control system becomes more complex
Solution Approach 1:
The patent implements feedback through the rotation control determination unit that continuously monitors motor operation parameters and provides information to the control parameter changing unit. This feedback loop enables the system to detect abnormalities such as foreign matter obstruction and automatically adjust control parameters to maintain fuel pump operation, achieving improved reliability through a relatively simple feedback-based control mechanism rather than complex structural changes.
Solution Approach 2:
The patent applies self-service by enabling the control system to automatically detect and respond to abnormalities without external intervention. The rotation control determination unit and control parameter changing unit work together to autonomously monitor motor status, identify issues like impeller interference, and adjust parameters to maintain operation, reducing the need for complex manual control systems or additional hardware while ensuring continuous fuel pump operation.
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; an abnormality determination unit configured to determine whether an abnormality has occurred in the motor based on the control failure frequency parameter; and a stop suppression unit configured to suppress stop of rotation of the motor by changing a motor control parameter to perform the motor rotation control when the abnormality determination unit determines that an abnormality has occurred in the motor.