Electric Oil Pump Control Using Direct Oil Temperature Sensing
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Solution Overview
Problem
Conventional electric oil pump control systems face issues with pump operation and oil supply when wiring or communication lines connecting temperature sensors and controllers are disconnected, leading to potential stoppages or inadequate oil supply.
Innovation Solution
The electric oil pump and its control system incorporate a motor control unit that directly receives temperature sensor detection information, allowing for independent driving control and continued operation even if the command signal from the superordinate controller is interrupted, using a temperature sensor disposed within the housing for accurate temperature detection and storing control modes and corresponding command values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the temperature sensor is connected to the superordinate controller via wiring and communication lines, then the control system can implement centralized control, but the system reliability deteriorates when wiring or communication lines are disconnected
Solution Approach 1:
The control system is segmented into two independent control paths: the original superordinate controller path and a new autonomous motor control unit path. The motor control unit can independently receive temperature sensor signals and control the motor without relying on the superordinate controller, ensuring pump operation continuity even when communication lines are disconnected.
Solution Approach 2:
The motor control unit acts as an intermediary between the temperature sensor and the motor. It directly receives temperature detection signals from the sensor and autonomously controls the motor based on these signals, eliminating the need for communication through the superordinate controller and ensuring reliable operation independent of wiring or communication line status.
2Reliability
If the motor control unit directly receives temperature sensor detection information, then the pump operation reliability is improved, but the device complexity increases
Solution Approach 1:
The temperature sensor detection function and motor control functions are merged into a single integrated motor control unit. This consolidation allows the unit to directly process temperature signals and control the motor autonomously, improving reliability while managing complexity through functional integration rather than adding separate independent components.
Solution Approach 2:
The motor control unit is designed to autonomously receive temperature detection signals and independently control the motor without external intervention from the superordinate controller. This self-service capability ensures the pump can maintain operation even when the communication system fails, improving reliability while keeping the control architecture manageable through autonomous operation.
3Measurement precision
If the temperature sensor is disposed inside the housing to detect oil temperature near the pump unit, then the temperature measurement precision is improved, but the device complexity increases
Solution Approach 1:
The temperature sensor is pre-positioned inside the housing at a location that enables direct detection of oil temperature near the pump unit. This preliminary placement ensures accurate temperature measurement from the start, allowing the control system to make precise temperature-based decisions without requiring additional measurement components or complex temperature estimation algorithms.
Data Source
AI summary
An electric oil pump includes a pump unit, rotating to make oil flow, a motor driving the pump unit, a control unit exerting driving control on the motor, and a housing accommodating the pump unit, the motor, and the motor control unit. In the electric oil pump, the motor control unit directly receives detection information of a temperature sensor detecting a temperature of the oil and exerts driving control on the motor based on the detection information.