Low Pressure Fuel Injection System with Threshold Valve
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Solution Overview
Problem
Existing high-pressure fuel injection systems are complex and costly, making them unsuitable for a wide range of engine applications, and they require multiple sensors and pumps to manage fuel delivery efficiently.
Innovation Solution
A low-pressure fuel injection system with a charge forming device that includes multiple throttle bores, an inlet chamber, and a valve mechanism that allows fuel flow only when the pressure exceeds a threshold, utilizing a pressure sensor and temperature sensor to control the valve operation, reducing the need for high-pressure pumps and complex sensor systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure fuel injection systems are used, then fuel delivery efficiency is improved, but system complexity and cost increase
Solution Approach 1:
The patent changes the pressure parameter from high-pressure to low-pressure operation. The fuel injection system operates at low pressure (below 5 psi) compared to conventional high-pressure systems, fundamentally altering the operating parameters to reduce complexity while maintaining fuel delivery functionality through pressure-sensitive valve actuation
Solution Approach 2:
The system uses pressure-sensitive valves that automatically open and close based on fuel tank pressure levels without requiring external sensors or control systems. The fuel pressure itself serves the dual function of both delivering fuel and actuating the injection valves, eliminating the need for separate high-pressure pumps and control sensors
2Measurement precision
If multiple sensors and high-pressure pumps are used, then fuel delivery control is improved, but cost increases
Solution Approach 1:
The fuel pressure itself acts as the control signal for valve actuation. When fuel pressure exceeds a predetermined threshold (e.g., 5 psi), the pressure-sensitive valves automatically open to allow fuel injection. This eliminates the need for external pressure sensors, temperature sensors, and complex electronic control systems, significantly reducing component count and manufacturing cost
Solution Approach 2:
The patent introduces pressure-sensitive valves as intermediary components that translate fuel pressure into mechanical valve actuation. These valves serve as a mechanical mediator between the fuel supply system and the injection process, replacing the need for electronic sensors and control circuits while maintaining precise fuel delivery control
3Productivity
If high-pressure pumps are used, then fuel injection performance is improved, but system simplicity is reduced
Solution Approach 1:
The patent extracts and eliminates the high-pressure pump component from the fuel injection system. Instead of using mechanical pumps to generate high pressure, the system relies on the natural pressure differential between the fuel tank and the injection point, combined with pressure-sensitive valve actuation, to achieve fuel delivery without complex pressurization mechanisms
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
The system provides a cost-effective and simplified fuel injection mechanism that maintains efficient fuel delivery by controlling fuel flow based on pressure and temperature, reducing the complexity and cost associated with high-pressure systems while ensuring reliable engine operation.
Implementation Method 1
a valve having an inlet in communication with the inlet chamber, an outlet and a valve head that is movable and allows flow from the inlet chamber through the outlet when the pressure in the inlet chamber is greater than a threshold pressure
Implementation Method 2
the valve head may be urged against the valve seat by a biasing member
Data Source
AI summary
In at least some implementations, a charge forming device includes multiple throttle bores, an inlet chamber in which fuel is received, at least one fuel passage communicating the inlet chamber with the throttle bores, and a valve having an inlet in communication with the inlet chamber, an outlet and a valve head that is movable and allows flow from the inlet chamber through the outlet when the pressure in the inlet chamber is greater than a threshold pressure.