Injection Valve Attenuation Current Adjustment for Noise Reduction
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Solution Overview
Problem
The opening movement of the inlet valve in high-pressure pumps of internal combustion engine systems generates noise due to sudden stops, and existing methods for attenuating this noise using an attenuation current are either ineffective or disrupt the pump's efficiency by applying either too much or too little braking force.
Innovation Solution
A method to adjust the initial attenuation current intensity by detecting induction pulses in the current intensity signal and adjusting the current intensity level based on predetermined criteria to achieve optimal braking without detaining the inlet valve, thereby reducing noise while maintaining pump efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the attenuation current intensity is increased to brake the inlet valve opening movement and reduce noise, then noise attenuation is improved, but the inlet valve may not open at all or opens too late, adversely affecting pump efficiency
Solution Approach 1:
The attenuation current is applied dynamically during the opening movement of the inlet valve, with current intensity continuously increased as the valve opens, providing adaptive braking force that reduces noise while maintaining adequate valve opening
Solution Approach 2:
The current intensity of the attenuation current is continuously adjusted during the valve opening process, changing from a lower initial value to a higher value as the valve approaches full opening, optimizing both noise reduction and pump efficiency
2Productivity
If the attenuation current intensity is decreased to maintain pump efficiency, then pump efficiency is preserved, but the inlet valve opens with too much momentum, reducing noise attenuation effectiveness
Solution Approach 1:
The attenuation current is applied periodically during each pump cycle, specifically during the opening movement phase of the inlet valve, providing targeted noise reduction without continuous energy consumption that would affect pump efficiency
Solution Approach 2:
The current intensity is dynamically adjusted to match the valve opening progression, providing sufficient braking force when needed while minimizing interference with the opening process
3Reliability
If a high starting current is applied to the electromagnet to ensure the inlet valve opens, then reliable valve opening is achieved, but excessive braking force is exerted, preventing valve opening or causing delayed opening
Solution Approach 1:
The attenuation current is applied in advance during the opening movement phase, before the valve reaches full opening, allowing the valve to open reliably while providing progressive braking force to reduce noise
Solution Approach 2:
The current intensity starts at a lower level and increases continuously during the opening process, ensuring the valve opens reliably initially while providing increasing braking force to attenuate noise as the valve approaches full opening
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 approach effectively attenuates the opening noise of the inlet valve by adjusting the attenuation current intensity, ensuring the valve opens smoothly and efficiently, thus improving the overall performance and reducing noise in high-pressure injection systems.
Implementation Method 1
The electromagnet to which current is applied magnetically attracts an armature which is connected to the inlet valve
Implementation Method 2
a restraining current can flow through or be applied to the electromagnet during the opening movement in order to brake the opening movement by way of the magnetic force generated as a result
Implementation Method 3
an induction pulse (47), which is caused by an opening movement of the inlet valve (16), is detected in a current intensity signal (46) of the subsequently decaying attenuation current (44)
Data Source
AI summary
Various embodiments include a method for adjusting an initial attenuation current for an injection valve comprising: moving a piston to a TDC; while moving the piston, closing an inlet valve; expelling the fluid; moving the piston away from TDC and applying an attenuation current to an electromagnet with the inlet valve still closed; switching a source for the attenuation current off; detecting an induction pulse resulting from an opening movement of the inlet valve by monitoring a current intensity signal of a subsequent decay in the current; adjusting a current intensity over a plurality of pump cycles to a current intensity level; checking for each current intensity level whether a time profile of the induction pulse satisfies a predetermined detention criterion; and when the detention criterion is satisfied, adjusting the current intensity level for future pump cycles to a lower current intensity level than the most recent level.