Digital Inlet Metering Valve for High-Speed Diesel Pump Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-pressure diesel pumps experience a drop in volumetric efficiency due to an inability to fill the pumping chamber at high speeds, particularly exacerbated in twin-headed pumps, where the inlet metering valve is a significant restriction.
Innovation Solution
A digital inlet metering valve (DIMV) is introduced, which acts as an electro 2-way valve controlling the inlet flow into a buffer chamber connected to the pumping heads, switching to an open state during the filling phase and closing before the end of the phase to optimize fuel filling in both single and twin-head pumps, ensuring efficient compression and preventing backflow into the compression chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional inlet metering valve is used to control fuel flow to the pump, then the device structure is simple, but the volumetric efficiency drops significantly at high engine speeds due to inability to fill the pumping chamber quickly enough
Solution Approach 1:
The DIMV opens before the filling phase begins to pre-fill the buffer chamber with fuel. This preliminary action ensures that when the filling phase starts and the inlet valve opens, fuel is already available in the buffer chamber to immediately fill the compression chamber, eliminating the filling delay that occurs at high engine speeds
Solution Approach 2:
A buffer chamber is introduced as an intermediary between the DIMV and the compression chamber. The buffer chamber acts as a fuel reservoir that decouples the fuel delivery from the compression cycle, allowing the DIMV to control fuel flow independently while ensuring continuous fuel availability to the compression chamber regardless of engine speed variations
2Productivity
If the DIMV remains open for the entire filling phase to ensure complete chamber filling, then volumetric efficiency is maintained, but fuel continues flowing after compression phase begins causing backflow and energy loss
Solution Approach 1:
The control unit monitors the pumping cycle phase and uses this feedback to precisely control the DIMV timing. The DIMV is closed when the control unit detects the end of the filling phase or beginning of compression phase, preventing fuel backflow while ensuring complete chamber filling during the filling phase
Solution Approach 2:
The DIMV timing is dynamically adjusted based on the pumping cycle phase. The valve opens before filling phase begins and closes at the transition to compression phase, creating a dynamic control strategy that adapts to the real-time state of the pumping cycle to optimize both filling efficiency and prevent backflow loss
3Productivity
If a twin-headed pump is used to increase fuel delivery capacity, then productivity increases, but the inlet metering valve becomes a greater restriction and volumetric efficiency drops further
Solution Approach 1:
A single DIMV is designed to control the inlet flow to both pumping heads through a common buffer chamber. This universal control approach simplifies the inlet flow control system compared to having separate metering valves for each head, while the buffer chamber ensures adequate fuel supply to both heads simultaneously, maintaining volumetric efficiency even with increased fuel delivery capacity
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 DIMV enhances volumetric efficiency by ensuring precise control of fuel flow into the compression chambers, maintaining efficiency even at high engine speeds, and integrates seamlessly with twin-head pumps to maintain compact assembly and efficient fuel compression.
Implementation Method 1
The DIMV comprises an electro 2-way valve controlling the inlet into a buffer chamber
Implementation Method 2
a piston reciprocally moving along a pumping axis (X1), between BDC and TDC for performing a pumping cycle (C1)
Implementation Method 3
a compression chamber having an inlet controlled by an inlet valve and an outlet controlled by an outlet valve
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A pressurising device of a direct fuel injection equipment comprising a digital inlet metering valve controlling an inlet fluid communication to a pump and wherein, the DIMV switches to an open state after said the pump initiates a filling phase (PF) and, switches to a closed state when approaching the end of said filling phase (PF).