Fuel Pump Dual Pressure Regulating Valves for Discharge Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel pumps experience instability in discharge pressure due to pulsations caused by changes in rotational speed, leading to inaccurate adjustment of pressurized fuel amounts and discharge stability issues.
Innovation Solution
A fuel pump design incorporating a first pressure regulating valve to stabilize average discharge pressure and a second pressure regulating valve with higher responsiveness to limit instantaneous pressure changes, ensuring stable fuel pressure supply to the metering valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pressure regulating valve is used to stabilize feed pressure, then the average pressure can be controlled, but instantaneous pressure pulsations cannot be sufficiently limited
Solution Approach 1:
The single pressure regulating valve is divided into two separate valves: a first pressure regulating valve for controlling average feed pressure and a second pressure regulating valve for limiting instantaneous pressure pulsations. This segmentation allows each valve to specialize in a specific aspect of pressure control, thereby resolving the contradiction between average pressure stability and instantaneous pressure accuracy.
Solution Approach 2:
The second pressure regulating valve operates in conjunction with the first to provide additional pressure regulation capability. By having a second valve that specifically targets instantaneous pulsations, the system applies partial action (the second valve only activates when needed for pulsation control) to enhance overall pressure control without continuously interfering with the first valve's average pressure regulation.
2Productivity
If the pump rotational speed increases, then the discharge pressure increases, but pressure pulsations become more severe
Solution Approach 1:
The dual pressure regulating valve system provides feedback control for pressure stabilization. The first valve responds to average pressure conditions while the second valve responds to instantaneous pressure deviations. This feedback mechanism automatically adjusts valve openings based on actual pressure conditions, counteracting the destabilizing effect of increased rotational speed and maintaining pressure stability even as discharge pressure increases.
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 solution effectively stabilizes the discharge amount of high-pressure fuel by adjusting the average feed pressure and limiting pulsations, enhancing the accuracy and stability of fuel discharge despite rotational speed fluctuations.
Implementation Method 1
a first pressure regulating valve that includes a first valve element which is opened when a pressure of the low pressure fuel becomes equal to or larger than a first preset pressure
Implementation Method 2
a second pressure regulating valve that includes a second valve element which is opened when a pressure of the low pressure fuel becomes equal to or larger than a second preset pressure, wherein a degree of responsiveness of valve opening and closing of the second pressure regulating valve is higher than a degree of responsiveness of valve opening and closing of the first pressure regulating valve
Data Source
AI summary
A metering valve is installed in a feed passage that supplies low pressure fuel, which is fed from a feed pump, to a pressurizing chamber. The metering valve adjusts a discharge amount of the low pressure fuel discharged from the pressurizing chamber. A first pressure regulating valve is opened in a case where a pressure of the low pressure fuel becomes equal to or larger than a first preset pressure. A second pressure regulating valve is opened in a case where the pressure of the low pressure fuel becomes equal to or larger than a second preset pressure. The first pressure regulating valve and the second pressure regulating valve are configured such that a degree of responsiveness of valve opening and closing of the second pressure regulating valve is higher than a degree of responsiveness of valve opening and closing of the first pressure regulating valve.