Pressure Pulse Damper Integrating Sensor for Ice Pressure Compensation

Solution Overview

Problem

Existing ice pressure-resistant fluid delivery modules for exhaust gas aftertreatment in diesel engines face challenges in compensating for the volume increase of freezing aqueous urea solutions, which can lead to damage if not adequately addressed.

Innovation Solution

A compact fluid delivery module design featuring a pressure pulse damper with a directly integrated pressure sensor, a cylindrical structure with an elastic wall, and a piston-shaped compensation element, minimizing the volume to be compensated and allowing for efficient absorption of ice pressure without additional compensation elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional ice pressure compensation elements are installed to compensate for freezing fluid volume increase, then ice pressure compensation capability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveice pressure compensation capabilityVSAvoidmodule structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pressure sensor is directly integrated onto the pressure pulse damper body, eliminating the need for separate connecting lines and additional ice pressure compensation elements. This merging of components achieves ice pressure compensation while simplifying the overall module structure and reducing manufacturing complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pressure pulse damper serves multiple functions: it dampens pressure fluctuations during pump operation and simultaneously compensates for ice pressure volume increase during freezing. This multi-functionality eliminates the need for dedicated ice pressure compensation elements, reducing device complexity while maintaining reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If additional ice pressure compensation elements are installed to compensate for freezing fluid volume increase, then ice pressure compensation capability is improved, but manufacturing cost increases

Engineering Contradiction:

Improveice pressure compensation capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The pressure sensor is directly integrated onto the pressure pulse damper body, eliminating the need for separate connecting lines and additional ice pressure compensation elements. This merging of components achieves ice pressure compensation while simplifying the overall module structure and reducing manufacturing complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pressure pulse damper serves multiple functions: it dampens pressure fluctuations during pump operation and simultaneously compensates for ice pressure volume increase during freezing. This multi-functionality eliminates the need for dedicated ice pressure compensation elements, reducing device complexity while maintaining reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If connecting lines between pressure sensor and pressure pulse damper are made larger to accommodate ice pressure, then ice pressure compensation capability is improved, but the volume to be compensated increases

Engineering Contradiction:

Improveice pressure transmission capabilityVSAvoidfluid volume in connecting lines

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The pressure sensor is directly integrated onto the pressure pulse damper body, eliminating the need for separate connecting lines and additional ice pressure compensation elements. This merging of components achieves ice pressure compensation while simplifying the overall module structure and reducing manufacturing complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 design simplifies the module construction, reduces manufacturing costs, and ensures effective compensation of ice pressure fluctuations, maintaining operational readiness during freezing and thawing cycles.

Implementation Method 1

a pressure pulse damper (6) designed to absorb pressure fluctuations of the fluid

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

a pressure sensor (14) arranged directly on the pressure pulse damper (6)

Methodology Applied

Scientific EffectPressure sensing: Piezoresistive Effect

Implementation Method 3

the wall of the cylindrical section is at least partially elastic. This allows the wall of the cylindrical section to deform in order to absorb the ice pressure or the volume increase of the freezing fluid

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 4

the pressure pulse damper comprises an element that is elastically movable in the axial direction of the cylinder and is therefore able to compensate for pressure fluctuations of the fluid during operation of the conveying module

Methodology Applied

Scientific EffectPressure-induced displacement: Pressure Gradient

Data Source

PatentEP3368752B1Freezing pressure resistant fluid conveying module

Publication Date: 2019.07.24 ROBERT BOSCH GMBH

Figure 1

AI summary

The invention relates to a conveying module (2) for conveying a fluid, in particular for conveying a fluid reducing agent for treating exhaust gas, comprising a pressure pulse dampener (6) for compensating pressure fluctuations of the fluid, and a pressure sensor (14) which is arranged directly on the pressure pulse dampener (6).