Gaseous Fuel Injector Valve Body Ventilation

Solution Overview

Problem

Gaseous-fuel injector devices in motor-vehicle engines, particularly those using LPG, face issues with the accumulation of oily deposits that slow down the valve member, leading to malfunctioning and incorrect fuel delivery due to the thermal cycle, which current solutions attempt to address by improving fuel filter efficiency.

Innovation Solution

Incorporating auxiliary ventilation openings in the valve body to allow gaseous fuel to flow directly into the area where the valve member slides, facilitating the evacuation of oily deposits and reducing the need for high-performance filters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the fuel filter efficiency is improved to reduce oily deposits, then the amount of deposits is reduced, but the device complexity and cost increase

Engineering Contradiction:

Improveoily depositsVSAvoidfiltering apparatus

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The invention extracts the harmful oily deposits from the critical sliding area by introducing auxiliary ventilation openings that create a gas flow path. This flow path carries the oily deposits away from the valve member sliding surface, effectively removing the harmful accumulation without requiring more complex filtration systems

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses pneumatic principles by utilizing the incoming gaseous fuel flow to create a flushing effect through the auxiliary ventilation openings. The gas flow dynamically removes oily deposits from the sliding area, replacing the need for enhanced mechanical filtration with a pneumatic cleaning mechanism

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Object-affected harmful factors

If the fuel filter efficiency is improved to reduce oily deposits, then the amount of deposits is reduced, but the cost increases

Engineering Contradiction:

Improveoily depositsVSAvoidfiltering apparatus

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The invention extracts the harmful oily deposits from the critical sliding area by introducing auxiliary ventilation openings that create a gas flow path. This flow path carries the oily deposits away from the valve member sliding surface, effectively removing the harmful accumulation without requiring more complex filtration systems

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses pneumatic principles by utilizing the incoming gaseous fuel flow to create a flushing effect through the auxiliary ventilation openings. The gas flow dynamically removes oily deposits from the sliding area, replacing the need for enhanced mechanical filtration with a pneumatic cleaning mechanism

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Reliability

If the valve member travel is slowed down by deposits, then the dynamic flowrate varies, but the device complexity remains unchanged

Engineering Contradiction:

Improvefuel deliveryVSAvoidinjector device

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention applies preliminary action by continuously flushing the sliding area with gaseous fuel flow through the auxiliary ventilation openings. This preventive measure removes oily deposits before they can accumulate to problematic levels, maintaining reliable valve member travel and consistent fuel delivery without adding complex control systems

Inventive Principle:

Principle #10Preliminary action

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 deposit buildup, ensuring proper valve member operation and reducing the required filter performance, resulting in simpler and less costly filtration systems.

Implementation Method 1

enable inflow of the gaseous fuel coming from the supply, not only into said inlet opening, but also into the area inside said valve body slidably mounted within which is the valve member

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

Said openings function as ventilation openings that enable exploitation of the flow of gas at inlet to the injector device in order to obtain an effective flushing of the critical area in which the valve member is slidably mounted so as to obtain a direct evacuation of the oily deposits

Methodology Applied

Scientific EffectFlushing:

Data Source

PatentUS9316192B2Gaseous-fuel-injector device for internal-combustion engines

Publication Date: 2016.04.19 FIAT POWERTRAIN TECHNOLOGIES

AI summary

In a gaseous-fuel-injector device for internal-combustion motor-vehicle engines, the valve body of the injector device has one or more auxiliary openings giving out onto an internal surface of the valve body in which the valve member of the injector device is slidably mounted. Said auxiliary openings are arranged in such a way as to enable the inflow of the gaseous fuel coming from the supply, not only into the inlet opening of the injector device, but also into the internal area of the valve body in which the valve member is slidably mounted, so as to obtain an effect of ventilation and flushing, by means of the flow of gaseous fuel, in an area where there tend to form deposits of the oily substances contained in the gaseous fuel.