Fuel Injector Valve Pressure Pin Force Sensor Needle Detection
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Solution Overview
Problem
Existing fuel injection valves for internal combustion engines face challenges in precisely detecting the movement of the nozzle needle, particularly the opening and closing times, due to limited pressure measurement capabilities, which affects the accuracy of fuel injection and wear compensation.
Innovation Solution
A fuel injection valve design that allows direct pressure measurement in the control chamber using a pressure pin interacting with a force sensor, enabling precise detection of nozzle needle movement without affecting the control valve's functionality, and incorporating a precision bore outlet throttle for precise fuel metering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure chamber connected via outlet throttle is used to measure control chamber pressure, then pressure measurement is enabled, but measurement precision is limited because the pressure in the pressure chamber is not equal to the pressure in the control chamber
Solution Approach 1:
The patent extracts the pressure measurement function directly from the indirect pressure chamber system and places it directly into the control chamber. The pressure pin with force sensor is positioned to directly measure control chamber pressure, eliminating the intermediate pressure chamber and outlet throttle that caused measurement inaccuracies. This direct measurement approach resolves the contradiction by obtaining true control chamber pressure data without information loss.
Solution Approach 2:
The pressure pin serves as a new intermediary element that directly transmits control chamber pressure to the force sensor. Unlike the previous indirect path through the pressure chamber and outlet throttle, this new intermediary provides accurate real-time pressure data essential for precise needle movement detection and timing determination.
2Ease of operation
If a movable control sleeve in the form of a magnet armature is used, then control valve functionality is achieved, but device complexity increases and measurement accuracy is compromised
Solution Approach 1:
The patent merges the pressure measurement function with the existing control valve structure by integrating the pressure pin and force sensor directly into the control chamber. This eliminates the need for separate pressure chambers and complex routing, reducing overall device complexity while maintaining full control valve functionality through the magnet armature.
3Measurement precision
If pressure measurement is implemented without direct control chamber access, then measurement capability is added, but manufacturing precision requirements increase due to additional components
Solution Approach 1:
The pressure pin serves multiple functions: it acts as both a structural component within the control chamber and a measurement element for pressure detection. This multi-functionality eliminates the need for separate dedicated pressure measurement components, thereby reducing manufacturing precision requirements while still enabling accurate pressure measurement.
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
Enables precise control of injection quantity and timing, reducing uncertainty in needle movement detection and minimizing structural changes, thus improving the overall precision and reliability of the fuel injection process.
Implementation Method 1
The control valve member (28) is moved by means of an electromagnet (25)
Implementation Method 2
actuated either by means of an electromagnet or a piezoelectric actuator
Implementation Method 3
whose end face remote from the control chamber interacts with a force sensor (35)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The valve has a housing (1) provided with a length-adjustable nozzle needle (8) for opening and closing an injection port (16) with a nozzle seat (15). The nozzle needle with the nozzle seat is turned away from a surface (108) of the housing. A control chamber (10) is filled with fuel under high pressure and provided with a control valve (22) and a low pressure chamber (18). An end of a pressure pin (33) is provided in the control chamber, which cooperates with a surface of a force sensor (35). A control valve link (28) is formed in sleeve-shape and surrounds the pressure pin.