Power System Oil Bypass Control for Low-Temperature Pressure
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Solution Overview
Problem
In low-temperature environments, the viscosity of oil in power systems increases, leading to excessive pressure within the power unit, which can be mitigated by heating the oil, but this approach increases manufacturing cost and weight.
Innovation Solution
A power system design with a bypass flow path and controlled valve system that allows oil to circulate through a return pump and supply pump, maintaining pressure and heating the oil without additional heating devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating devices are added to raise oil temperature in low-temperature environments, then oil viscosity decreases and pressure is reduced, but manufacturing cost and system weight increase
Solution Approach 1:
The oil circulation system utilizes the existing supply pump and return pump to heat the oil through self-service. The pumps create circulation flow that passes oil through the power unit where it absorbs heat, raising oil temperature without requiring external heating devices. This eliminates additional components while achieving the temperature increase needed to reduce viscosity and pressure.
2Temperature
If oil circulation is increased to raise oil temperature, then viscosity decreases and lubrication improves, but pressure within the power unit may become excessive
Solution Approach 1:
The system dynamically adjusts oil circulation by controlling the operation of supply pump and return pump. The circulation flow rate is regulated to optimize heat transfer and raise oil temperature while maintaining pressure within safe limits. This dynamic control allows the system to achieve temperature increase without creating excessive pressure conditions.
Solution Approach 2:
The system implements feedback control by monitoring pressure conditions within the power unit and adjusting pump operation accordingly. When pressure approaches excessive levels, the circulation flow is modulated to maintain safe operating conditions while continuing to raise oil temperature through controlled circulation.
3Adaptability or versatility
If additional heating components are installed to mitigate high viscosity, then oil temperature increases and flow improves, but the system becomes more complex and expensive
Solution Approach 1:
The existing supply pump and return pump are made multi-functional by having them serve both their primary lubrication function and a secondary heating function. By circulating oil through the power unit, these pumps simultaneously provide lubrication and heat transfer, eliminating the need for separate heating components while improving oil flow performance in cold conditions.
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
Efficiently raises oil temperature while preventing excessive pressure and reducing manufacturing cost and weight by utilizing the supply and return pumps for heating, ensuring stable lubrication and operation.
Implementation Method 1
utilizing the supply and return pumps for heating
Implementation Method 2
for lubricating the power unit
Implementation Method 3
maintaining pressure
Data Source
AI summary
A power system including: a power unit, a supply pump for feeding liquid oil for lubricating the power unit; a supply flow path for guiding, to the power unit, the oil fed from the supply pump; a return pump for returning the oil having flowed through the power unit; a return flow path for guiding, to the return pump, the oil having flowed through the power unit; a circulation flow path for guiding, to the supply pump, the oil returned by the return pump; a bypass flow path connecting the supply flow path and the return flow path; and an on-off valve for opening and closing the bypass flow path.