Fuel System Venturi Nozzle Control Line Integration
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Solution Overview
Problem
Existing fuel systems for internal combustion engines do not effectively utilize the entire fuel quantity diverted by the pressure control valve for the Venturi nozzle, leading to inefficiencies in fuel management and leakage discharge, especially during engine startup and maintenance.
Innovation Solution
The Venturi nozzle is arranged in the control line of the pressure control valve, ensuring that the entire diverted fuel quantity is utilized, and a spring-loaded check valve is used to protect the pre-supply pump from overloading and facilitate fuel flow even at low pressures, with a non-return valve for quick pressure buildup and efficient leakage return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the Venturi nozzle is arranged in a discharge line of the pressure control valve, then the pressure control function is achieved, but only part of the diverted fuel quantity is available for the Venturi nozzle function
Solution Approach 1:
The patent merges the Venturi nozzle into the control line of the pressure control valve, combining the pressure control function and the Venturi nozzle function into a single integrated component. This eliminates the need for separate discharge lines and ensures that the entire diverted fuel quantity is available for the Venturi nozzle, resolving the contradiction between fuel quantity availability and system complexity.
2Stress or pressure
If the pressure control valve operates at high pressure, then pressure control is effective, but fuel does not flow through the Venturi nozzle effectively at low pressure conditions
Solution Approach 1:
The patent introduces a spring-loaded check valve that changes the pressure parameters in the control line. The check valve allows fuel to flow through the Venturi nozzle even at comparatively low pressures by preventing backflow and maintaining positive pressure differential, ensuring effective leakage discharge during engine startup and low-pressure operation while maintaining pressure control at high pressures.
3Reliability
If the pre-supply pump operates continuously, then fuel supply is maintained, but the pump is overloaded when pressure filters are clogged
Solution Approach 1:
The patent introduces a pressure control valve with a check valve as an intermediary component between the pre-supply pump and the high-pressure pump. This intermediary monitors pressure conditions and provides a bypass or relief mechanism when filters are clogged, protecting the pre-supply pump from overload while maintaining fuel supply continuity through the control line.
4Quantity of substance
If fuel is pumped through the pre-supply pump during filling, then the fuel system is filled, but the process is time-consuming
Solution Approach 1:
The patent segments the fuel filling path by introducing a bypass line with a check valve that allows fuel to be filled directly into the high-pressure pump and common rail system, bypassing the pre-supply pump. This segmentation enables rapid filling operations while the pre-supply pump remains available for normal operation, resolving the contradiction between filling quantity and filling time.
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 configuration allows for effective fuel management, ensuring fuel flows through the Venturi nozzle at low pressures, enabling efficient leakage discharge and quicker pressure buildup, while protecting the pre-supply pump and optimizing fuel usage during engine startup and maintenance.
Implementation Method 1
Suction means comprising a venturi nozzle are arranged at the downstream end of the zero delivery line
Implementation Method 2
a spring-loaded check valve blocking the high-pressure pump is arranged in the return line
Implementation Method 3
the pressure control valve has a first opening pressure, from which it connects the control line to a return line
Data Source
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AI summary
The present invention relates to a fuel system (10) for an internal combustion engine (12) in particular of a motor vehicle, comprising a prefeed pump (26), a high pressure pump (30), a dosing device (36) hydraulically arranged between the prefeed pump (26) and the high pressure pump (30), and a zero feed line (38) for disposing of leakages of the dosing device (36). In the fuel system (10), suction means are arranged in the zero feed line (38), or on the downstream end thereof.