Two-Valve Fuel Pressure Control for Faster, Stable Reduction
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Solution Overview
Problem
Existing fuel pressure control systems for internal combustion engines struggle to quickly reduce fuel pressure and suppress pressure fluctuations in the fuel passage, particularly when using gas fuels like hydrogen, which have poor lubricity and are prone to increased wear due to frequent valve operations.
Innovation Solution
A fuel pressure controller that employs a combination of electromagnetic valves and a processing circuitry to execute a series of processes, including closing both valves initially, followed by controlled opening and closing operations of specific valves to adjust fuel pressure within prescribed limits, thereby reducing pressure fluctuations and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single electromagnetic valve is used for fuel pressure control, then the device complexity is low, but the fuel pressure reduction speed is slow and pressure fluctuations are large
Solution Approach 1:
The fuel pressure control system is segmented into two distinct electromagnetic valves: a first electromagnetic valve positioned upstream and a second electromagnetic valve positioned downstream. This segmentation allows each valve to perform specific functions - the first valve handles coarse pressure reduction while the second valve performs fine pressure control, thereby achieving faster overall pressure reduction and reduced fluctuations without excessive complexity
Solution Approach 2:
The system dynamically switches between different valve operation modes based on real-time pressure conditions. The control unit activates the first electromagnetic valve when rapid pressure reduction is needed, and uses the second electromagnetic valve for precise pressure maintenance. This dynamic operation optimizes the pressure reduction speed while managing device complexity through intelligent control
2Manufacturing precision
If electromagnetic valves operate frequently to control fuel pressure, then the fuel pressure control precision is high, but the wear on electromagnetic valves increases
Solution Approach 1:
The first electromagnetic valve performs partial pressure reduction action by reducing pressure to an intermediate level, and the second electromagnetic valve performs the remaining adjustment to reach the target pressure. This partial action approach reduces the total number of operations needed from a single valve, thereby maintaining control precision while reducing wear on individual valve components
Solution Approach 2:
The first electromagnetic valve acts as an intermediary that performs preliminary pressure reduction before the second electromagnetic valve takes over for fine control. This intermediary role distributes the operational workload, reducing the frequency of operations for each individual valve and thereby extending their service life while maintaining overall system precision
3Speed
If fuel pressure is reduced quickly by closing the electromagnetic valve, then the fuel pressure reduction speed is high, but large pressure fluctuations occur in the fuel passage
Solution Approach 1:
The pressure reduction process is segmented into two stages: rapid initial reduction by the first electromagnetic valve followed by gradual fine-tuning by the second electromagnetic valve. This segmentation allows the system to achieve fast pressure reduction initially while preventing large fluctuations through the subsequent gentle adjustment phase
Solution Approach 2:
The control system dynamically adjusts the operation of both electromagnetic valves based on real-time pressure feedback. The first valve operates dynamically for rapid pressure reduction when needed, while the second valve dynamically engages to stabilize pressure and eliminate fluctuations, achieving both speed and stability through coordinated dynamic control
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 controller effectively quickens fuel pressure reduction, suppresses pressure fluctuations, and reduces wear on electromagnetic valves by optimizing valve operations, ensuring stable fuel pressure within controlled ranges.
Implementation Method 1
a first electromagnetic valve that is provided in the fuel passage so as to selectively open and close the fuel passage, and a second electromagnetic valve that is provided in the fuel passage
Implementation Method 2
adjusting the pressure of the fuel supplied to the fuel injection valve by repeatedly performing an opening and closing operation of the second electromagnetic valve
Data Source
AI summary
A fuel pressure controller includes processing circuitry that executes a first process, a second process, and a third process as a fuel pressure reduction control. The first process includes closing both a first electromagnetic valve and a second electromagnetic valve. The second process includes adjusting the pressure of the fuel supplied to a fuel injection valve by repeatedly performing an opening and closing operation of the second electromagnetic valve. The third process includes, when the fuel pressure in a fuel pipe between the first electromagnetic valve and the second electromagnetic valve reaches a prescribed pressure, stopping the opening and closing operation of the second electromagnetic valve to maintain the second electromagnetic valve in an open state, and repeatedly performing the opening and closing operation of the first electromagnetic valve to adjust the pressure of the fuel supplied to the fuel injection valve.