Plunger Fuel Pump Valve Pressure Equalization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing high-pressure fuel pumps experience unstable closing timing of the electromagnetic valve due to pressure variations, leading to inaccurate fuel discharge control, as the internal and external pressure differences affect the valve's operation.
Innovation Solution
A fluid passage is provided between the hermetically closed space of the electromagnetic valve and the external space during valve opening, stabilizing the closing timing by preventing internal-external pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electromagnetic valve is used to control fuel discharge in a high-pressure fuel pump, then fuel flow rate control is achieved, but pressure variations cause unstable closing timing of the valve
Solution Approach 1:
The patent applies equipotentiality by equalizing the pressure on both sides of the electromagnetic valve through a communication passage. The passage allows fuel to flow between the hermetically closed space (where pressure varies during pump operation) and the external space (where pressure is more stable), ensuring that pressure differences do not affect valve closing timing. This creates a pressure equilibrium that stabilizes valve operation despite external pressure variations.
2Reliability
If a hermetically closed space is formed in the electromagnetic valve to improve sealing, then valve sealing performance is improved, but internal-external pressure differences affect valve operation stability
Solution Approach 1:
The patent uses an intermediary approach by introducing a communication passage that acts as a mediator between the hermetically closed space and the external space. This passage allows pressure equalization while maintaining the hermetic sealing when needed. The communication passage serves as an intermediary channel that resolves the conflict between maintaining seal integrity and preventing pressure difference-induced instability.
3Speed
If the air gap between attractive member and movable member is minimized to improve electromagnetic force, then valve opening speed is improved, but negative pressure causes cavity formation
Solution Approach 1:
The communication passage serves as an intermediary fuel supply channel that prevents cavity formation by ensuring continuous fuel availability in the air gap region. When the electromagnetic valve opens rapidly, fuel can flow through the communication passage to fill the space created by the moving valve components, preventing vacuum formation and subsequent cavitation that would harm the valve operation.
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 ensures a stable flow rate of fuel discharge for each cycle by maintaining consistent valve closure timing, regardless of pressure variations, thereby improving the accuracy of fuel control.
Implementation Method 1
An air gap between the attractive member and movable member of an electromagnetic drive section in a hydraulic control valve is minimized by electromagnetic force resulting from energization.
Implementation Method 2
A fluid passage is provided between the hermetically closed space of the electromagnetic valve and the external space during valve opening, stabilizing the closing timing by preventing internal-external pressure differences.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A plunger type high-pressure fuel pump is provided that can prevent variations of valve-closing operation resulting from a pressure difference caused between a hermetically closed space defined inside an electromagnetic valve of the fuel pump and an external space outside thereof. The electromagnetic valve includes: a valve member (91) including a suction valve (5); a solenoid coil adapted to displace the valve member; an anchor (32) made of a magnetic material provided with the valve member (91); and a core (30) forming a magnetic circuit to attract the anchor (32) by the electromagnetic force and dividing the inside of the electromagnetic valve into a hermetically closed space (38) and an external space (39) communicating with the fluid suction passage. The anchor (32) or the core (30) is provided with a fluid passage (41) through which fluid can flow between the hermetically closed space (38) and the external space (39) formed by the anchor (32) and the core (30), respectively when the suction valve (5) is in an opened state.