Fuel Pressure Regulator Segmentation for Stable High-Pressure Supply
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Solution Overview
Problem
Conventional fuel supply systems face challenges in maintaining high fuel supply pressure while avoiding increased size of pressure regulators, leading to instability in fuel pressure due to fluctuating fuel consumption and increased operational load on the fuel pump.
Innovation Solution
A fuel supply system with a back pressure control pump and pressure regulator that adjusts fuel pressure by controlling the back pressure chamber, using a check valve to manage the secondary fuel passage and regulate pressure without upsizing the pressure regulator, allowing for stable high-pressure fuel supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the set pressure of the pressure regulator is raised to compress and liquefy fuel vapors and promote atomization, then fuel supply pressure is improved, but the elastic member must be upsized which increases the size of the pressure regulator
Solution Approach 1:
The system is divided into two independent pressure regulators: a first pressure regulator for regulating fuel supply pressure to the fuel injection system, and a second pressure regulator for regulating back pressure in the fuel pump. This segmentation allows each regulator to be optimized for its specific function, enabling high fuel supply pressure without requiring an oversized second regulator.
Solution Approach 2:
The back pressure regulating passage acts as an intermediary mechanism to control the back pressure in the fuel pump. By introducing a controlled passage with a flow control member, the system can regulate back pressure independently, allowing the first pressure regulator to maintain high set pressure without being constrained by the size of the second regulator.
2Stress or pressure
If the set pressure of the pressure regulator is raised to promote atomization of fuel injections, then fuel atomization is improved, but fuel pressure becomes unstable due to fluctuating fuel consumption
Solution Approach 1:
The system establishes a feedback loop where the back pressure regulating passage continuously monitors and adjusts back pressure based on fuel consumption fluctuations. The flow control member responds to pressure changes, maintaining stable back pressure that in turn stabilizes the set pressure of the first pressure regulator, ensuring consistent fuel supply pressure despite varying engine demand.
Solution Approach 2:
The system dynamically adjusts the back pressure parameter through the flow control member in the back pressure regulating passage. By changing the flow characteristics of the back pressure passage, the system can compensate for fuel consumption fluctuations and maintain a stable back pressure parameter, which directly stabilizes the fuel supply pressure regulated by the first pressure regulator.
3Stress or pressure
If high fuel supply pressure is maintained to compress and liquefy fuel vapors, then fuel vapor compression is improved, but the fuel pump operates under heavy load reducing its endurance
Solution Approach 1:
By segmenting the pressure regulation function into two independent regulators, the system allows the fuel pump to operate at variable loads rather than continuous heavy load. The second pressure regulator can reduce back pressure when high fuel supply pressure is not required, thereby reducing the operational load on the fuel pump and extending its service life while maintaining the ability to provide high pressure when needed.
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 effectively maintains high fuel supply pressure without increasing the size of the pressure regulator, stabilizing fuel pressure and reducing operational load on the fuel pump, thus enhancing durability and efficiency.
Implementation Method 1
The diaphragm is bulged by forces applied by a fuel pressure in the back pressure chamber and by a fuel pressure in the fuel pressure regulating chamber
Implementation Method 2
In a construction in which an elastic member such as a spring applies a biasing force onto the diaphragm, the set pressure of the pressure regulator is determined also by the biasing force of the elastic member
Implementation Method 3
using a check valve to manage the secondary fuel passage and regulate pressure
Data Source
AI summary
In a fuel supply system, a fuel pump supplies fuel from a fuel tank to a fuel supply piping and to a back pressure introducing passage. A pressure regulator has a fuel pressure regulating chamber communicated to the fuel supply piping, and a back pressure chamber communicated to the back pressure introducing passage. When a fuel pressure in the fuel pressure regulating chamber is larger than a relief pressure that bulges the diaphragm toward the back pressure chamber, a relief valve opens a relief port to return the fuel from the fuel pressure regulating chamber to the fuel tank. The relief pressure is adjusted by controlling a fuel pressure in the back pressure chamber of the pressure regulator.