Transmission Oil Filter Media Switching for Low-Temperature Flow
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Solution Overview
Problem
Existing lubricant filters for vehicle transmissions face challenges in maintaining adequate filtration performance across varying conditions, such as high oil viscosity and low temperature, due to the unsuitability of media types and complex flow distribution structures, leading to inefficiencies and increased pressure drop.
Innovation Solution
A filtration device with a dual filtration medium system, featuring a selection valve that dynamically switches between two filtration media based on sensor inputs, allowing independent operation of pleated media for normal and degraded conditions, and a partitioned housing design that simplifies manufacturing and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If pleated filter media is used to extend filter life and maintain low pressure drop, then filtration surface area increases, but filtration performance decreases when oil viscosity is high or temperature is low
Solution Approach 1:
The filter system dynamically switches between two different filter media based on operating conditions (temperature, viscosity). A sensor detects oil temperature or viscosity, and a control mechanism activates the appropriate media: pleated media for normal conditions to extend filter life, and alternative media for cold/high-viscosity conditions to maintain filtration performance.
Solution Approach 2:
The system changes the filtration parameter by selecting different media types based on oil temperature and viscosity parameters. When temperature drops below a threshold or viscosity increases, the system switches from pleated media to a different media configuration, adapting the filtration characteristics to match the operating conditions.
2Adaptability or versatility
If a single filtration media is used in the filter, then device complexity is reduced, but the filter cannot adapt to varying operating conditions such as temperature and viscosity changes
Solution Approach 1:
The filter is segmented into two independent filtration zones, each with its own media type. The first zone contains pleated media for normal operating conditions, while the second zone contains alternative media for cold/high-viscosity conditions. A separator wall divides the zones, and a control mechanism can activate or deactivate each zone based on sensor input, allowing the filter to adapt without excessive complexity.
3Reliability
If multiple filtration media are combined in a single chamber without selective control, then filtration performance may improve, but pressure drop increases and one media type may become unsuitable for certain conditions
Solution Approach 1:
The system uses dynamic control to activate only the appropriate filtration media for current operating conditions. Instead of forcing oil through multiple media types simultaneously, the sensor-based control system opens or closes passages to route oil through the single most suitable media type, maintaining low pressure drop while ensuring high filtration efficiency.
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
Enhances filtration efficiency by selectively using appropriate media for varying conditions, reducing complexity and maintaining optimal performance across different operating scenarios while minimizing pressure drop and extending filter life.
Implementation Method 1
a first filtration medium disposed in said internal volume; a second filtration medium disposed in said internal volume
Data Source
Figure 1~2A
Figure 2B~3
Figure 4~5
AI summary
The filtration device (1), acting as a transmission filter, purifies oil drawn into a transmission device using a medium. The housing (2) carries a valve with a dividing body, including an internal partition, to connect the inlet (3) either to a first upstream zone (Z1) for filtration by a first internal medium (M1), or to a second upstream zone (Z1') for filtration by a second internal medium (M2) separate from the first medium. The valve is actively controlled to selectively move a shutter element (7) in an inlet interface (15) according to a parameter typically detected by a sensor. A partition element (2c) of the housing can complement a partition (6c) provided between the media (M1, M2) in a common support structure for an insert or filter assembly. The outlet (4) connects to a downstream zone common to these two media.