CNG Filter Housing with Coolant Passageways for Cold Weather Operation
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Solution Overview
Problem
Natural gas filters in vehicles are prone to freezing at low temperatures, which can cause operational issues during vehicle start-up, as they may contain water and filtering elements that can freeze, leading to component malfunction.
Innovation Solution
The design incorporates a housing with coolant ports and passageways that route engine coolant through the filter assembly to prevent freezing by maintaining a temperature above freezing and warming the compressed natural gas passing through, ensuring the filter and CNG remain operational across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a natural gas filter is installed in a vehicle to remove particulate matter from compressed natural gas, then the fuel quality is improved, but the filter is prone to freezing at low temperatures which causes operational issues
Solution Approach 1:
The patent introduces an intermediary substance (glycol-based antifreeze solution) that circulates through the filter housing to prevent freezing of the filter components. This intermediary protects the filter from harmful freezing conditions while maintaining its filtering function, resolving the contradiction between reliability and freezing susceptibility.
Solution Approach 2:
The patent changes the physical parameter of the filter housing by incorporating a glycol-based antifreeze solution that lowers the freezing point of the fluid surrounding the filter elements. This parameter change (freezing point depression) allows the filter to operate reliably in cold temperatures without freezing, addressing the contradiction between operational reliability and freezing risk.
2Reliability
If the filter housing is insulated to prevent freezing, then the filter is protected from cold temperatures, but the insulation adds complexity to the filter assembly
Solution Approach 1:
The patent employs a self-service approach where the vehicle's existing coolant system serves the dual purpose of cooling the engine and preventing freezing of the filter assembly. The glycol-based antifreeze solution circulates automatically through the filter housing, providing passive thermal protection without requiring additional active heating or complex insulation structures.
Solution Approach 2:
The patent makes the coolant system universal by having it perform multiple functions: cooling the engine and simultaneously preventing freezing of the natural gas filter. This multi-functionality eliminates the need for separate heating or insulation systems, reducing overall device complexity while maintaining reliability in cold conditions.
3Reliability
If the filter elements are made more efficient to remove finer particulates, then the fuel purity is improved, but the filter elements are more susceptible to freezing
Solution Approach 1:
The patent introduces a glycol-based antifreeze solution as an intermediary that surrounds the high-efficiency filter elements, preventing them from freezing while maintaining their fine particulate removal capability. This intermediary protects the vulnerable filter elements without interfering with their filtering function, allowing both high fuel purity and cold-weather operation.
Solution Approach 2:
The patent changes the thermal parameter of the filter element environment by circulating glycol-based antifreeze that maintains the temperature above freezing point. This parameter change allows high-efficiency filter elements to operate in cold conditions without freezing, preserving both fuel purity and operational reliability.
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 effectively prevents the natural gas filter from freezing, ensuring continuous operation of the vehicle by maintaining the filter and CNG at a temperature above freezing, even in extreme cold conditions, thereby ensuring reliable fuel delivery to the engine.
Implementation Method 1
The housing further defines coolant ports with associated coolant passageways configured to route engine coolant through the housing to warm the filter assembly
Data Source
AI summary
A filter assembly for a vehicle can be configured to be in fluid communication with a source of compressed natural gas and coolant for an engine. The filter assembly, when so arranged, filters the compressed natural gas and routes the coolant there through to warm the filter assembly.