Fuel Valve Assembly Anti-Icing via Continuous Flushing
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Solution Overview
Problem
The existing fuel delivery systems in diesel vehicles face issues with ice formation on pressure control valves due to water condensation, which can lead to valve malfunction at sub-zero temperatures, especially when using hygroscopic fuels like biodiesel.
Innovation Solution
A valve arrangement with a pressure control valve designed to continuously flush with fresh fuel, ensuring that any collected water is carried away and preventing ice formation, featuring an inlet and outflow outlet that allow fuel to flow even when the valve is closed, and a spring-loaded valve element that opens at specific pressure to reduce pressure in the valve chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure control valve is closed to prevent excess pressure, then pressure control is improved, but water condensation accumulates on the valve and causes ice formation at sub-zero temperatures
Solution Approach 1:
The patent extracts the harmful water condensation from the valve chamber by providing a separate drainage path. The valve chamber includes a drainage opening that allows water to be drained away from the pressure control valve elements, preventing ice formation while maintaining pressure control functionality.
Solution Approach 2:
The patent introduces an intermediary heating element (heating wire or heating plate) in the valve chamber that acts as a mediator to prevent water from freezing. The heating element raises the temperature in the valve chamber above freezing point, allowing the pressure control valve to operate reliably in sub-zero environmental conditions.
2Reliability
If fuel is allowed to flow continuously through the valve chamber, then ice formation is prevented, but fuel consumption increases
Solution Approach 1:
The patent implements continuous fuel flow through the valve chamber by designing the fuel delivery system to pass through the valve chamber on its way to the engine. This continuous flow serves dual purposes: maintaining pressure control functionality and preventing water accumulation and ice formation, without requiring additional fuel consumption.
Solution Approach 2:
The patent makes the fuel delivery system multi-functional by using the same fuel flow for both pressure control and anti-icing purposes. The fuel that passes through the valve chamber performs both its primary function of delivering fuel to the engine and the secondary function of preventing ice formation, eliminating the need for separate systems.
3Reliability
If a heating element is added to the valve chamber, then ice formation is prevented, but device complexity increases
Solution Approach 1:
The patent merges the heating element with existing components in the fuel delivery system. The heating wire is integrated into the valve chamber structure or wrapped around existing components, and the heating control is combined with the pressure control valve's control system, reducing the need for separate control mechanisms.
Solution Approach 2:
The patent implements self-regulating heating where the heating element is activated only when needed (when water accumulation is detected or in cold conditions) and automatically turns off when the temperature is sufficient. This self-service approach minimizes energy consumption and reduces the complexity of continuous heating control systems.
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
Prevents ice formation on the pressure control valve, ensuring continuous operation by maintaining a flow of fresh fuel through the valve elements and preventing water from freezing, thus avoiding valve malfunctions at low temperatures.
Implementation Method 1
The functional elements of the pressure control valve, i.e. the valve closure or the valve element and the valve seat, can be continuously flushed or flushed with fresh fuel. A collection of water condensate in the valve arrangement and in particular in the valve chamber can be prevented.
Implementation Method 2
The pressure control valve is designed in such a way that the valve closure opens at a specific pressure in the valve chamber and fuel flows from the valve chamber into the outlet in order to reduce the pressure in the valve chamber.
Implementation Method 3
The pressure control valve can be a spring-loaded valve, i.e. a valve element such as a valve ball or a valve cone is pressed against a valve seat against a pressure in the valve chamber. If a pressure is reached that exerts a force on the valve element that is greater than the spring force, the valve element is moved away from the valve seat
Data Source
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AI summary
A valve assembly (20) for a fuel supply system (10) comprises a head (30) which includes an inlet (22) for connection to a delivery line (16) of the fuel supply system (10) and a valve chamber (48) connected to the inlet (22). The valve assembly further comprises a pressure regulating valve (21). A valve closure (50) of the pressure regulating valve (21) is arranged in the valve chamber (48). The valve assembly (20) is designed such that at a certain pressure in the valve chamber (48), the valve closure (50) opens and fuel flows from the valve chamber (48) into an outlet (24) of the pressure regulating valve (21) to reduce the pressure in the valve chamber (48). The attachment (30) includes a flow outlet (26) which is connected to the valve chamber (48) so that the valve closure (50) is surrounded by fuel even when the pressure regulating valve (21) is closed.