Natural Gas Pressure Reduction Paths for Valve Freeze Protection
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Solution Overview
Problem
The rapid pressure changes in the natural gas supply to the electronic pressure regulating valve in high-pressure direct injection engines cause excessive temperature drops, leading to potential faults and damage.
Innovation Solution
A method and apparatus that dynamically adjust the pressure reduction pipeline by determining the current engine operating condition, selecting the appropriate pressure reduction pipeline with stabilizing tanks, and connecting it to the electronic pressure regulating valve to stabilize the pressure and prevent excessive temperature drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressure of natural gas is reduced from 580 bar to 280 bar through the electronic pressure regulating valve, then the injection pressure is adjusted to meet engine load requirements, but the temperature drops excessively causing fault in the electronic pressure regulating valve
Solution Approach 1:
The single-stage pressure reduction is divided into multiple stages by introducing intermediate pressure reducing valves and stabilizing tanks. The natural gas pressure is reduced in steps (e.g., 580 bar → 350 bar → 280 bar) rather than directly, with each stage having its own stabilizing tank to buffer the gas and control temperature drop, thereby protecting the electronic pressure regulating valve from excessive temperature changes while maintaining the ability to achieve various injection pressures.
2Stability of the object's composition
If multiple pressure reduction pipelines are introduced to stabilize pressure, then the pressure stability improves, but the system complexity increases
Solution Approach 1:
The system uses switching valves to dynamically select which pressure reduction pipeline is active based on current engine operating conditions and required injection pressure. This allows the system to adapt between different pressure reduction paths (e.g., direct connection for high pressure, or through intermediate valves for lower pressures) without permanently installing all possible pipelines, thus reducing overall system complexity while maintaining pressure stability when needed.
3Stability of the object's composition
If stabilizing tanks are added to each pressure reduction pipeline, then the pressure fluctuation is reduced, but the system volume increases
Solution Approach 1:
Multiple stabilizing tanks are merged into a single shared stabilizing tank that serves all pressure reduction pipelines. The stabilizing tank is positioned to receive gas from different pressure reduction paths and provide stabilization for the entire system. This eliminates the need for separate stabilizing tanks for each pipeline, significantly reducing system volume while still providing effective pressure fluctuation damping for all pipelines.
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
Ensures stable pressure delivery to the electronic pressure regulating valve, preventing damage and ensuring smooth engine operation while allowing for timely pipeline switching in case of faults.
Implementation Method 1
stabilizing pressure values of the stabilizing tanks on different pressure reduction pipelines are different
Implementation Method 2
The pressure reduction process is achieved by 'vaporizing the liquefied natural gas'
Implementation Method 3
If the pressure of natural gas changes too much, such as from 580 bar to 280 bar, it will cause a very large temperature drop at the electronic pressure regulating valve
Data Source
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AI summary
The present application relates to the technical field of engine control, and specifically to a pressure regulation method, an apparatus, a vehicle, a medium, and a program product. The method includes: determining current operating condition of an engine during vehicle's driving process; determining a required injection pressure value for the engine based on the current operating condition; determining a target pressure reduction pipeline from multiple pressure reduction pipelines based on the injection pressure value; and connecting the target pressure reduction pipeline with the electronic pressure regulating valve by adjusting a connecting valve. By using the above method, the natural gas can be stabilized within a certain pressure range after passing through the target pressure reduction pipeline, thereby avoiding the problem of excessive temperature drop caused by excessive pressure change of the natural gas behind the electronic pressure regulating valve, which may lead to damage to the electronic pressure regulating valve.