Suction Jet Pump Valve Controls Fuel Flow
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Solution Overview
Problem
The existing suction jet pumps in fuel tanks of motor vehicles face inefficiencies during the starting process due to premature opening of the valve in the propellant line, leading to fuel diversion to the ejector pump instead of the internal combustion engine, resulting in oversized and costly fuel pumps to meet increased demand.
Innovation Solution
A through-flow opening with a valve body and springs is designed to keep the valve closed until system pressure is reached, allowing the ejector pump to operate only within a presettable pressure range, ensuring fuel delivery to the engine by closing the valve above system pressure during starting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve in the propellant line is opened to supply fuel to the ejector pump during the starting process, then the fuel supply to the internal combustion engine is improved, but the fuel pump becomes oversized and requires significantly more installation space
Solution Approach 1:
The valve is designed to dynamically change its state based on system pressure conditions. During normal operation at system pressure, the valve opens to supply fuel to the ejector pump. During starting processes when pressure exceeds system pressure, the valve closes to redirect all fuel to the internal combustion engine. This dynamic behavior eliminates the need for an oversized fuel pump.
Solution Approach 2:
The valve responds to changes in pressure parameters by opening or closing. The pressure-actuated mechanism detects when pressure exceeds the predetermined system pressure level and automatically closes the valve, thereby controlling fuel distribution based on pressure conditions without requiring manual intervention or complex control systems.
2Productivity
If the valve opens at system pressure to allow fuel flow to the ejector pump, then the ejector pump operates efficiently, but during starting processes the valve opens prematurely causing fuel diversion from the internal combustion engine
Solution Approach 1:
The valve incorporates a feedback mechanism where the pressure condition is continuously monitored and fed back to the valve actuator. When pressure exceeds the predetermined system pressure (such as during starting processes), the feedback signal triggers the valve to close, preventing fuel diversion. This ensures reliable fuel supply to the internal combustion engine while maintaining ejector pump operation under normal conditions.
3Productivity
If the fuel pump is dimensioned to meet the increased demand during starting processes with the valve open, then adequate fuel supply is ensured, but the fuel pump becomes more expensive
Solution Approach 1:
The system uses a dynamically controllable valve that adapts to different operating conditions. During starting processes, the valve closes to redirect fuel flow, allowing a smaller, more cost-effective fuel pump to meet the peak demand. During normal operation, the valve opens to distribute fuel to both the internal combustion engine and ejector pump. This dynamic control eliminates the need for an expensive oversized pump.
Solution Approach 2:
The valve's pressure-sensitive design allows it to respond automatically to pressure parameter changes. When pressure exceeds the predetermined system pressure during starting processes, the valve closes, redirecting fuel flow. This parameter-based control mechanism enables the use of a smaller, more economical fuel pump while maintaining adequate fuel supply under all operating conditions.
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 solution allows the fuel pump to be dimensioned smaller, ensuring adequate fuel supply to the internal combustion engine while preventing fuel diversion to the ejector pump during critical situations, reducing installation space and costs.
Implementation Method 1
at least one spring (25) is arranged in this way inside the housing (13) that it holds the valve body (18) in a position that closes the through-flow opening (17) on the outlet side until the system pressure is reached
Implementation Method 2
As soon as the fuel pump reaches system pressure, the force acting on the valve body is greater than the spring force, as a result of which the valve body is moved out of the position that closes the flow-through opening on the outlet side
Implementation Method 3
If the pressure rises above the system pressure during a starting process, the valve body is moved further against the spring force until it reaches a position that closes the flow opening on the inlet side
Data Source
Figure 1
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Figure 4~5
AI summary
The invention relates to a suction jet pump (8), consisting of a driving jet nozzle (10), a mixing tube (11), an intake opening (12), a working-fluid line (7) connected to the driving jet nozzle (10), and a valve (9) which is arranged with the working-fluid line (7) and whose housing (13) has an inlet (14) and an outlet (15). A throughflow opening (17) with a valve body (18) on both sides of the throughflow opening (17) is arranged in the housing (13) in such a way that the throughflow opening (17) can be closed on both the inlet side and the outlet side, and that at least one spring (25, 27, 28) is arranged inside the housing (13) in such a way that it holds the valve body (18) in a position closing the throughflow opening (17) on the outlet side until the system pressure is reached.