Reducing Agent Delivery Line With Segmented Channels
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Solution Overview
Problem
Existing conveying devices for reducing agents in mobile internal combustion engines generate noise and lack precision in dosing, leading to increased consumption and operational costs, particularly due to the use of pulsative pumps.
Innovation Solution
A device with a pulsatively operating delivery pump and a delivery line featuring at least two separate channels with different flow paths, which reduces noise and improves dosing accuracy by offsetting pressure pulses and compensating for pressure fluctuations through destructive interference and varying transit times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pulsatively operating delivery pump is used to convey reducing agent, then reliability and cost are improved, but feed noise is generated
Solution Approach 1:
The delivery line is divided into at least two separate channels that transport the reducing agent in parallel. This segmentation allows the pressure pulses generated by the pulsative pump to be distributed across multiple paths, reducing the amplitude of pressure fluctuations and noise in each individual channel while maintaining the reliability of the pump system.
2Ease of manufacture
If a pulsatively operating delivery pump is used to convey reducing agent, then cost is reduced, but dosing accuracy deteriorates
Solution Approach 1:
By segmenting the delivery line into multiple separate channels with different lengths, the system maintains dosing accuracy despite using a cost-effective pulsative pump. The different channel lengths create phase shifts in the pressure pulses, which cancel out fluctuations and ensure consistent flow rates, thereby preserving dosing precision while using economical pump technology.
3Object-affected harmful factors
If separate channels with different flow paths are used in the delivery line, then noise is reduced through destructive interference, but device complexity increases
Solution Approach 1:
The delivery line is segmented into multiple separate channels with different lengths, creating a simple yet effective noise reduction system. The different path lengths cause pressure pulses to arrive at different times, resulting in destructive interference that cancels noise. This approach reduces noise without requiring complex active noise cancellation systems or additional filtering components.
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 solution results in a cost-effective, low-noise, and precise delivery of reducing agents, independent of the pump model, effectively reducing noise and consumption while maintaining efficient operation across different pump models.
Implementation Method 1
the channels form flow paths with different maturities for the reducing agent... offsetting pressure pulses and compensating for pressure fluctuations through destructive interference and varying transit times
Data Source
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AI summary
The invention relates to a device (1) for delivering reducing agent (2) from a tank (3) to a dispensing unit (4), comprising a pulsating delivery pump (5) for delivering reducing agent (2) and having a delivery direction (6) through a delivery line (7) from the tank (3) to the dispensing unit (4). The delivery line (7) comprises at least two separated channels (8) in areas downstream of the delivery pump (5) in the delivery direction (6), and the channels (8) form flow paths (9) having different transit times for the reducing agent (2). Such an embodiment of the invention leads in particular to cost-effective noise reduction of such delivery systems.