Engine Oil Supply System Bypass Valve Dynamics
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Solution Overview
Problem
Existing engine oil supply systems fail to efficiently adjust oil temperature according to changing driving conditions, leading to excessive cooling and increased friction loss, especially at low temperatures, which affects engine performance and fuel efficiency.
Innovation Solution
An engine oil supply system with a bypass valve that selectively routes oil to an oil cooler or filter based on temperature, using a wax-expansion mechanism to alternate supply paths, allowing oil to bypass the cooler during low temperatures and optimizing oil flow through a multistage bypass valve integrated within the oil pan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oil always flows through an oil cooler, then oil temperature is reduced, but friction loss increases and oil temperature cannot reach appropriate levels quickly at low temperatures
Solution Approach 1:
The bypass valve dynamically adjusts the oil flow path based on temperature conditions. At low temperatures, the valve directs oil away from the cooler to maintain warmth and reduce friction loss. At high temperatures, the valve redirects oil through the cooler to reduce excessive heat. This dynamic adjustment resolves the contradiction by adapting the cooling system to actual thermal conditions rather than operating in a fixed state.
Solution Approach 2:
The system changes the flow path parameter of oil based on temperature parameters. The bypass valve responds to temperature changes by altering the routing configuration, allowing oil to either bypass or pass through the cooler depending on whether the temperature is below or above a threshold. This parameter-based control enables the system to optimize between temperature reduction and friction loss reduction.
2Loss of time
If a bypass path is used to prevent oil from flowing through the oil cooler, then oil temperature increase time is reduced, but the system cannot adjust oil temperature according to changing driving conditions
Solution Approach 1:
The bypass valve provides dynamic adaptability by automatically adjusting the oil flow path in response to varying driving conditions and temperature levels. Unlike a fixed bypass system, this valve-enabled configuration can switch between cooling and bypass modes based on real-time thermal conditions, thereby achieving both rapid warm-up at low temperatures and effective cooling when needed.
Solution Approach 2:
The bypass valve operates based on feedback from temperature conditions. When oil temperature is low, the valve configuration allows bypass flow to maintain temperature and reduce warm-up time. When oil temperature rises to appropriate levels or exceeds them, the valve redirects flow through the cooler. This feedback mechanism enables the system to adapt to changing driving conditions while optimizing temperature management.
3Device complexity
If oil passage, bypass valve, and oil filter are integrated in a module, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent integrates the oil passage, bypass valve, and oil filter into a single modular assembly. This merging of components simplifies the overall device configuration by eliminating the need for separate mounting brackets, additional connections, and multiple assembly steps. The integrated module reduces device complexity while the modular design allows for standardized manufacturing processes that can maintain precision requirements through systematic production methods.
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 simplifies the oil supply circuit, reduces manufacturing costs and weight, enhances engine durability by maintaining lubrication, and improves fuel efficiency by minimizing pressure drop and optimizing oil flow, while maintaining initial hydraulic pressure quickly upon engine start.
Implementation Method 1
a bypass valve disposed in the oil passage to selectively supply the oil in the oil passage to at least one of the oil cooler or the oil filter
Data Source
AI summary
An engine oil supply system may include an oil pan connected with an oil pump at a first side and connected with an oil cooler at a second side, an oil passage through which oil pressurized by the oil pump flows, an oil filter disposed in the oil pan to filter impurities in the oil supplied from the oil pump, and a bypass valve disposed in the oil passage to selectively supply the oil in the oil passage to at least one of the oil cooler and the oil filter.