Inlet Metering Valve Pole Piece Geometry for Fuel Pump Noise Reduction
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Solution Overview
Problem
Existing inlet metering valves in fuel injection systems generate acoustic noise due to collisions between the armature and other components caused by fluctuations in magnetic force during operation.
Innovation Solution
An inlet metering valve assembly with a single pole piece featuring a groove with slope-shaped portions and a narrowed section that attenuates the magnetic field, ensuring a constant magnetic force on the armature, reducing collisions and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional fuel pump system is used without a metering valve, then the fuel pump can be simple in design, but precise fuel metering cannot be achieved and fuel quantity varies with engine speed
Solution Approach 1:
The metering valve is integrated directly into the fuel pump assembly, combining the fuel delivery and metering functions into a single unified component. This eliminates the need for separate metering devices while achieving precise fuel quantity control across different engine operating conditions.
Solution Approach 2:
The fuel pump system is designed to perform multiple functions: fuel delivery, pressure regulation, and precise metering. The single fuel pump assembly incorporates a metering valve that can accurately control fuel quantity across varying engine speeds, making the system universally applicable for different operating conditions without requiring additional specialized components.
2Stability of the object's composition
If fuel injection timing is delayed to allow complete vaporization, then fuel can vaporize completely, but the injection process overlaps with the power stroke reducing engine efficiency
Solution Approach 1:
Fuel is pre-mixed with air in the pump housing before injection into the combustion chamber. This preliminary mixing action ensures that fuel is already vaporized and ready for immediate combustion upon injection, eliminating the need to delay injection timing for vaporization and allowing optimal injection timing that does not overlap with the power stroke.
3Quantity of substance
If a separate air pump is used for air injection, then sufficient air can be supplied for fuel vaporization, but the device complexity increases
Solution Approach 1:
The air injection function is integrated into the fuel pump assembly. Air is drawn through a passage in the pump housing and mixed with fuel before injection, eliminating the need for a separate air pump while ensuring sufficient air is supplied for complete fuel vaporization and combustion.
Data Source
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AI summary
An inlet metering valve (IMV) assembly for an engine fuel pump (10) of a gasoline direct-injection (GDI) system, comprising an IMV cartridge assembly and a solenoid assembly (28), the IMV cartridge assembly comprising an IMV valve body (42) and a pole piece (44), the pole piece (44) comprising a peripheral wall (47) and a longitudinal cavity, the longitudinal cavity containing a guide (62), an armature (60) and a metering pin (68), the metering pin (68) being fixed to the armature (60), wherein the peripheral wall (47) of the pole piece (44) comprises a groove comprising a first slope-shaped portion (70), a second slope-shaped portion (71) and a narrowed portion (72), the narrowed portion (72) forming an intersection connecting the first slope-shaped portion (70) to the second slope-shaped portion (71).