Oil-Cooled Motor Pump Speed Control for Stable Heat Dissipation
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Solution Overview
Problem
The frequent changes in rotational speed of oil pumps in oil-cooled motors due to varying vehicle operating conditions lead to a reduced service life, as they struggle to match the heat dissipation demands of the motor effectively.
Innovation Solution
A control method and apparatus that determine the current operating condition of a vehicle based on power intervals, allowing for precise control of the oil pump's rotational speed by setting target temperatures and flow rates, reducing the need for frequent adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the rotational speed of the oil pump is frequently adjusted to match heat dissipation demands, then the heat dissipation effectiveness is improved, but the service life of the oil pump deteriorates
Solution Approach 1:
The patent applies dynamics by enabling the oil pump's rotational speed to vary according to operating conditions. The control system dynamically adjusts the pump speed based on motor loss heat power and oil temperature, allowing the system to adapt to changing heat dissipation demands while maintaining reasonable speed change frequency through interval-based control logic.
Solution Approach 2:
The patent changes the rotational speed parameter of the oil pump based on operating conditions. By calculating target rotational speed according to motor loss heat power, oil temperature, and flow rate requirements, the system optimizes heat dissipation effectiveness while managing the frequency of parameter changes to protect pump service life.
2Reliability
If the rotational speed of the oil pump is kept constant to extend service life, then the service life is improved, but the heat dissipation effectiveness deteriorates
Solution Approach 1:
Rather than keeping rotational speed constant, the patent implements dynamic speed adjustment based on real-time operating conditions. The control system calculates required flow rates and target rotational speeds according to motor heat generation and oil temperature, ensuring heat dissipation effectiveness is maintained while avoiding excessive or unnecessary speed changes.
Solution Approach 2:
The patent employs feedback control by continuously monitoring motor loss heat power and lubricating oil temperature, then adjusting oil pump rotational speed accordingly. This closed-loop control ensures heat dissipation effectiveness is maintained by responding to actual thermal conditions while managing adjustment frequency through interval-based control logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures the oil pump operates efficiently and extends its service life by maintaining optimal heat dissipation without frequent speed changes, ensuring stable motor operation.
Implementation Method 1
exchanges heat with a cooling water circuit through a heat exchanger or other heat exchange structures, thereby achieving heat dissipation of the oil-cooled motor
Data Source
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AI summary
A control method and apparatus for a cooling oil pump of an oil-cooled motor, a device, and a medium, where the method includes: acquiring a current loss heat power of the motor; determining a current operating condition of a vehicle according to a power interval in which the loss heat power is located; determining a target temperature of a lubricating oil according to the current operating condition of the vehicle; determining a target flow rate of the oil pump according to the current operating condition of the vehicle, the current loss heat power of the motor, and the target temperature of the lubricating oil; and determining a target rotational speed of the oil pump according to the target flow rate of the oil pump. This method does not require a rotational speed of the oil pump to be frequently adjusted, thereby ensuring a service life of the oil pump.