Reducing Agent Delivery Device Vibration Compensation
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Solution Overview
Problem
Existing delivery devices for reducing agents in internal combustion engines are noisy during operation, which can be bothersome for vehicle occupants, and they often struggle with rapid thawing of frozen reducing agents without causing damage.
Innovation Solution
A delivery device with a partially rigid reducing agent line and a pulsed delivery pump, incorporating vibration and structure-borne noise compensating devices such as inflow, outflow, and pump-internal compensating devices, along with metal components for rapid thawing, to mitigate noise and ensure efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pulsed delivery pump is used to deliver reducing agent, then the pump is small and inexpensive with little maintenance required, but it produces not inconsiderable noise during operation
Solution Approach 1:
A flexible hose is introduced as an intermediary element between the pulsed delivery pump and the rigid reducing agent line. This flexible hose absorbs vibrations and noise generated by the pump while allowing the pump to maintain its pulsed operation mode, thus resolving the contradiction between pump simplicity and noise generation.
Solution Approach 2:
The patent employs flexible hoses and flexible mounting elements to isolate the pump from the rigid system structure. These flexible components act as vibration dampers and noise reducers, allowing the pump to operate in pulsed mode without transmitting excessive noise to the vehicle interior.
2Loss of time
If a rigid reducing agent line is used, then the line can be quickly thawed after freezing, but the pump vibrations and noise are transmitted more effectively through the rigid structure
Solution Approach 1:
The reducing agent line is segmented into different sections with different properties. The section connected to the pump uses flexible hoses to reduce noise transmission, while other sections can be rigid to facilitate quick thawing. This segmentation allows the system to simultaneously achieve noise reduction and rapid thawing capability.
Solution Approach 2:
Different parts of the reducing agent line have different structural qualities. The local area near the pump uses flexible materials for noise isolation, while other areas use rigid materials for rapid heat transfer during thawing. This local differentiation resolves the contradiction between noise transmission and thawing speed.
3Object-generated harmful factors
If vibration compensating devices are added to reduce noise, then noise transmission is reduced, but the device complexity increases
Solution Approach 1:
The patent uses relatively simple and inexpensive vibration compensating devices such as flexible hoses and flexible mounting elements. These components are easy to install and maintain, providing effective noise reduction without significantly increasing system complexity or cost.
Solution Approach 2:
Flexible hoses serve as simple intermediary elements that provide vibration and noise compensation without requiring complex mechanisms. These hoses naturally absorb vibrations and dampen noise transmission while maintaining fluid flow, thus reducing noise without substantially increasing device complexity.
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 significantly reduces noise transmission and facilitates quick resumption of reducing agent delivery after freezing, ensuring effective and quiet operation of the delivery device.
Implementation Method 1
at least one vibration compensating device selected from the following group: an inflow compensating device disposed upstream of the delivery pump in the delivery direction; an outflow compensating device disposed downstream of the delivery pump in the delivery direction; a pump-internal compensating device disposed within the delivery pump; and a structure borne noise compensating device disposed on the fixing of the delivery pump
Implementation Method 2
along with metal components for rapid thawing
Data Source
AI summary
A delivery device for delivering a reducing agent from a reducing agent tank to an exhaust gas treatment device of an internal combustion engine, includes a partially rigid reducing agent line and a delivery pump disposed in the reducing agent line and having a delivery direction from the reducing agent tank to the exhaust gas treatment device. The delivery device has at least one vibration compensating device selected from the following group: an inflow compensating device upstream of the delivery pump in the delivery direction, an outflow compensating device downstream of the delivery pump in the delivery direction, a pump-internal compensating device within the delivery pump, and a structure borne noise compensating device on a fixing of the delivery pump. A motor vehicle having the delivery device is also provided.