Hydrogen Internal Combustion Engine Tumble Flow for Misfire Control

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Solution Overview

Problem

Hydrogen fuel in internal combustion engines poses challenges due to its easy ignitability, leading to misfiring and difficulties in achieving homogeneous combustion, which affects driving behavior and emission levels.

Innovation Solution

A method is employed where hydrogen is fed into the combustion chamber to induce a rotational movement about an axis perpendicular to the cylinder's longitudinal axis, forming a tumble flow that enhances mixing with air, thereby improving combustion efficiency and reducing emissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If hydrogen is fed into the combustion chamber, then combustion efficiency is improved, but misfiring occurs due to easy ignitability

Engineering Contradiction:

Improvecombustion efficiencyVSAvoidmisfiring risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by creating a tumble flow pattern before hydrogen ignition occurs. The air flow is pre-organized into a rotational movement that carries hydrogen towards the center of the combustion chamber, ensuring proper mixture formation and distribution before the ignition event, thereby preventing misfiring while maintaining high combustion efficiency

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If hydrogen is fed directly into the combustion chamber, then mixing with air is improved, but control of combustion becomes difficult

Engineering Contradiction:

Improvemixture homogeneityVSAvoidcombustion control

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent uses the combustion chamber walls and piston surface as intermediary elements to guide and control the hydrogen flow. The hydrogen jet impinges on these surfaces, which act as mediators to redirect the flow into a rotational tumble pattern, ensuring homogeneous mixing while maintaining可控able combustion progression

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If air flow forms a tumble flow, then mixing with hydrogen is improved, but device complexity increases

Engineering Contradiction:

Improvemixture homogeneityVSAvoidinlet geometry complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent applies self-service by utilizing the natural flow characteristics and pressure differentials within the combustion chamber to generate the tumble flow pattern. The hydrogen jet itself, combined with the existing air flow and chamber geometry, creates the rotational movement without requiring complex external inlet structures or additional flow control mechanisms

Inventive Principle:

Principle #25Self-service

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 results in a more homogeneous hydrogen/air mixture, preventing misfiring and ensuring low-emission, efficient combustion by promoting better mixture formation and flame propagation.

Implementation Method 1

in the combustion chamber, at least a flow of the hydrogen, at least in sections, carries out a rotational movement about at least one axis perpendicular to a longitudinal axis of the at least one cylinder

Methodology Applied

Scientific EffectRotational movement:

Implementation Method 2

a rotational flow of the fed in air, for example a tumble flow, is formed in a combustion chamber

Methodology Applied

Scientific EffectTumble flow:

Implementation Method 3

the hydrogen can disperse into the air in the combustion chamber

Methodology Applied

Scientific EffectDispersion: Diffusion

Implementation Method 4

This allows improved mixing with the air fed in to the combustion chamber, which results in a more homogeneous hydrogen/air mixture

Methodology Applied

Scientific EffectDiffusion: Diffusion

Implementation Method 5

hydrogen as fuel is combusted with air

Methodology Applied

Scientific EffectCombustion: Combustion

Implementation Method 6

hydrogen is a suitable fuel for approximately emission-free combustion engines

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS20250230765A1Method for Operating an Internal Combustion Engine, Internal Combustion Engine and Control Device

Publication Date: 2025.07.17 KEYOU GMBH

AI summary

Provided is a method for operating an internal combustion engine which includes at least one cylinder with a combustion chamber in which hydrogen fuel is combusted with air. In the combustion chamber, at least a flow of the hydrogen, at least in sections, carries out a rotational movement about at least one axis perpendicular to a longitudinal axis of the at least one cylinder. In order to provide a hydrogen/air mixture as homogeneous as possible which allows for low-emission and efficient combustion, the rotational movement of the flow about the axis perpendicular to the longitudinal axis of the at least one cylinder is induced by feeding in of the hydrogen.