Motor Cooling Water and Gearbox Oil Temperature Control
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Solution Overview
Problem
Existing cooling systems for electric motors in vehicles lack effective control over cooling water and oil flow rates, leading to inefficiencies and potential damage due to unregulated temperature conditions.
Innovation Solution
A computing device that adjusts the flow rate of cooling water and operates an oil pump based on temperature thresholds for the motor's coil and gearbox oil, minimizing cooling water supply when oil temperature is low and coil temperature is below a certain threshold, and optimizing oil pump operation to prevent friction and ensure proper cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling water is continuously supplied to the motor at a high flow rate, then the motor cooling effect is improved, but the oil temperature in the gear box cannot be maintained at an appropriate level, causing increased friction and potential damage
Solution Approach 1:
The cooling water flow rate is made dynamic rather than constant. The control device adjusts the flow rate based on real-time temperature conditions of both the motor and gear box oil, switching between high flow rate (when oil temperature is adequate) and low flow rate (when oil temperature needs maintenance). This dynamic adjustment resolves the contradiction by allowing the system to optimize motor cooling while preserving gear box oil temperature when conditions permit.
Solution Approach 2:
The system changes the parameter of cooling water flow rate based on temperature conditions. When gear box oil temperature is below a threshold, the flow rate is reduced to prevent excessive heat extraction from the oil. When oil temperature is adequate, the flow rate is increased to enhance motor cooling. This parameter change strategy allows the system to balance motor cooling requirements with gear box oil temperature maintenance.
2Reliability
If the oil pump is operated continuously at high speed, then the oil circulation and cooling effect are improved, but energy consumption increases and the system complexity increases
Solution Approach 1:
The oil pump operates periodically rather than continuously. The control device monitors gear box oil temperature and activates the pump only when the temperature exceeds a threshold, stopping it when the temperature is adequate. This periodic operation maintains necessary oil circulation and cooling while significantly reducing energy consumption compared to continuous operation.
Solution Approach 2:
The system uses the natural thermal state of the gear box oil to determine pump operation. When oil temperature is within acceptable ranges, the system does not require active pumping, allowing the oil to circulate naturally or remain stationary. The pump serves itself by activating only when thermal conditions necessitate active circulation, reducing unnecessary energy consumption.
3Reliability
If precise temperature monitoring and control of both cooling water and oil is implemented, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control device performs multiple functions: it monitors both motor temperature and gear box oil temperature, determines appropriate cooling water flow rates, controls the oil pump operation, and coordinates between these different control parameters. By consolidating these functions into a single multi-functional control unit, the system achieves precise temperature control without proportionally increasing overall system complexity.
Solution Approach 2:
The system implements feedback control by continuously monitoring temperature conditions and adjusting cooling water flow rate and oil pump operation accordingly. Temperature sensors provide feedback signals to the control device, which then adjusts system parameters to maintain optimal temperatures. This feedback mechanism enables precise control while using a relatively simple control architecture that responds automatically to temperature changes.
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
This solution allows for precise control of cooling water and oil flow, reducing friction, preventing motor damage, and maintaining efficient heat exchange, thereby enhancing the overall cooling system's performance and reliability.
Implementation Method 1
a cooling water circulating means that circulates the cooling water via a cooling water pipe between a cooling water cooling means for cooling the cooling water, the electric motor, and the lubricating oil means
Implementation Method 2
circulates the cooling water via a cooling water pipe
Implementation Method 3
an oil pump that supplies oil from a gear box attached to the motor to a coil of the motor
Implementation Method 4
a cooling water cooling means for cooling the cooling water
Data Source
AI summary
An object of the present invention is to appropriately control cooling water and oil according to situations. A computing device controls a flow rate of cooling water supplied to a motor and an oil pump that supplies oil from a gear box attached to the motor to a coil of the motor. The computing device suppresses the flow rate of the cooling water supplied to the motor when a temperature of oil in the gear box is less than a first threshold, and a temperature of the coil is less than a second threshold, and operates the oil pump.