Normally Open Fuel Injection Valve Spring Force Design
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Solution Overview
Problem
Current pressure control valves in fuel injection systems, particularly in common rail injection systems, face challenges in meeting the higher leakage requirements of start-stop systems and hybrid vehicles, while also being simple and inexpensive to produce.
Innovation Solution
A switching or pressure control valve designed as a normally open valve with a spring-loaded pressure pin and sealing seat, which provides safety and pressure maintenance functions, and can be produced using existing components with minimal additional parts, allowing for easy assembly and reduced energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure control valve is designed to meet higher leakage requirements for start-stop systems and hybrid vehicles, then leakage control is improved, but device complexity increases
Solution Approach 1:
The patent combines the pressure control valve with additional functions (pressure maintenance, safety function) into a single integrated device. The valve closing element incorporates both a valve seat for pressure control and a pressure maintenance seat, merging multiple functions into one component rather than using separate valves for each function.
Solution Approach 2:
The pressure control valve is designed to perform multiple functions simultaneously: pressure control through the valve seat, pressure maintenance through the pressure maintenance seat, and safety function through the normally open design. This multi-functional design eliminates the need for separate pressure-limiting valves and reduces overall system complexity.
2Reliability
If a pressure control valve is designed as a normally open valve with spring force in the opening direction, then safety function is improved, but device complexity increases
Solution Approach 1:
The safety function is integrated into the basic valve structure by designing it as normally open with the spring force acting in the opening direction. This eliminates the need for separate safety valves or complex control systems, as the valve automatically opens to prevent pressure increases if the actuator fails.
3Device complexity
If a pressure control valve integrates pressure maintenance function with pressure control function, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The valve closing element is designed with both a valve seat for pressure control and a pressure maintenance seat for pressure maintenance function. By integrating both functions into a single component rather than using separate valves, the patent reduces overall device complexity while the precision requirements are managed through the coordinated design of the two seating surfaces.
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 valve ensures safety by preventing pressure increases and maintains minimum pressure for start-stop operations, while being cost-effective and energy-efficient, with a compact design that reduces the need for a separate pressure-limiting valve.
Implementation Method 1
The proposed valve also includes a pressure pin, which is accommodated at least in regions in a central bore of the valve closing element and is acted upon by the spring force of a pressure-retaining spring in the direction of a sealing seat. According to the invention it is provided that the spring force of the valve spring acts on the valve closing element in the opening direction.
Implementation Method 2
The pressure pin, which is accommodated at least in regions in a central bore of the valve closing element and is acted upon by the spring force of a pressure-retaining spring in the direction of a sealing seat.
Implementation Method 3
The closing element has an annular sealing edge, the diameter of which essentially corresponds to the diameter of the central bore, so that the closing element is essentially pressure-balanced in the closed position, in which the sealing edge rests sealingly against a valve seat.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a switching or pressure regulating valve for a fuel injection system, in particular a common-rail injection system, comprising a movable valve closing element (2) cooperating with a valve seat (1), which can be actuated by means of an actuator (3) and is subjected to the spring force of a valve spring (4) opposite to the direction of action of the actuator (3), further comprising a pressure pin (5) which is received at least partially in a central bore (6) of the valve closing element (2) and is subjected to the spring force of a pressure retaining spring (8) in the direction of a sealing seat (7). According to the invention, the spring force of the valve spring (4) acts on the valve closing element (2) in the opening direction.