Blow-by Returning Injector for Ammonia Engine Intake

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Solution Overview

Problem

Engine apparatuses running on fuels containing corrosive substances, such as ammonia and methanol, face contamination of intake system components due to blow-by gas return, leading to shortened component life and increased costs.

Innovation Solution

Incorporating a blow-by returning injector or mixer that returns blow-by gas directly to the combustion chamber, rather than recirculating it through the intake passage, thereby minimizing contamination of intake system components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If blow-by gas is recirculated through the intake passage to the combustion chamber, then fuel consumption is reduced, but intake system components are contaminated and their service life is shortened

Engineering Contradiction:

Improvefuel consumptionVSAvoidservice life of intake system components

Core Design Contradiction:

Loss of energyVSDuration of action of stationary object

Solution Approach 1:

The patent divides the blow-by gas recirculation path into two separate systems: a fuel injection system that delivers corrosive fuel and a blow-by gas recirculation system that returns blow-by gas directly to the combustion chamber. This segmentation prevents blow-by gas from contacting intake system components while still achieving fuel consumption reduction through blow-by gas reuse.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses fuel as an intermediary substance to transport blow-by gas components to the combustion chamber. By mixing blow-by gas with fuel in the injection system, the corrosive substances serve as a medium that delivers blow-by gas directly to the combustion zone without requiring blow-by gas to travel through the intake passage, thus protecting intake components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If corrosion-resistant materials or coatings are applied to intake system components, then contamination resistance is improved, but cost increases

Engineering Contradiction:

Improvecontamination resistanceVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent extracts the blow-by gas recirculation function from the intake system by creating a separate recirculation path that bypasses the intake passage. This eliminates the need for corrosion-resistant materials or coatings on intake system components, thereby reducing manufacturing costs while still protecting against contamination.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of protecting the intake system components from blow-by gas contamination through corrosion-resistant materials, the patent inverts the approach by preventing blow-by gas from entering the intake system in the first place. The blow-by gas is routed directly to the combustion chamber through a separate path, eliminating the need for protective measures on intake components.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20250129758A1Engine apparatus

Publication Date: 2025.04.24 YANMAR HLDG CO LTD

AI summary

The engine apparatus runs on fuel containing a corrosive substance and includes a blow-by returning injector that returns the blow-by gas to the combustion chamber of the engine. The corrosive substance contained in the fuel is ammonia or methanol.