Hydrogen Engine Cylinder Head Layout for Tumble Mixing and Spark Ignition
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Solution Overview
Problem
Existing internal combustion engines face challenges in efficiently using hydrogen fuel due to the lack of spark plugs and optimal fuel-air mixing configurations, which are not suited for heavy-duty applications requiring high torque and low emissions.
Innovation Solution
A modified internal combustion engine design with a cylinder head featuring a pent roof configuration, skewed inlet and outlet ports, and a six-bolt securing mechanism, optimized for hydrogen combustion, which generates a tumble motion and ensures efficient mixing and ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional diesel engine configuration is used, then high compression ratio and torque are achieved, but the engine cannot ignite hydrogen fuel without a spark plug
Solution Approach 1:
The patent combines the spark ignition system (from gasoline engines) with the high compression ratio configuration (from diesel engines) into a single hybrid engine design. This merging allows the engine to ignite hydrogen fuel using a spark plug while maintaining the high compression characteristics needed for torque production, thereby resolving the contradiction between ignition capability and configuration complexity.
2Ease of operation
If a gasoline engine configuration with spark plug is used, then hydrogen fuel ignition is enabled, but high torque at low rpm characteristics are lost
Solution Approach 1:
The patent modifies key parameters of the gasoline engine configuration, specifically increasing the compression ratio to diesel-engine levels and optimizing the combustion chamber geometry. These parameter changes enable the spark-ignited engine to produce high torque at low rpm while maintaining hydrogen fuel ignition capability, thus resolving the contradiction between ignition functionality and power output.
3Use of energy by moving object
If diesel fuel injection system is used, then high efficiency compression ignition is achieved, but the system cannot ignite hydrogen fuel
Solution Approach 1:
The patent extracts the spark ignition capability from gasoline engines and integrates it into the diesel engine configuration, while retaining the high compression ratio and torque characteristics. This extraction and integration allows the engine to ignite hydrogen fuel (which requires spark ignition) while maintaining the energy efficiency and compression characteristics of diesel engines, resolving the contradiction between combustion efficiency and fuel compatibility.
4Ease of manufacture
If existing diesel engine designs are adapted for hydrogen, then minimal retooling costs are achieved, but optimal fuel-air mixing for hydrogen combustion is not realized
Solution Approach 1:
The patent applies local quality modifications to specific areas of the engine while maintaining the overall diesel engine architecture. The combustion chamber geometry and port configurations are locally optimized for hydrogen fuel-air mixing, while the majority of the engine components remain unchanged from existing diesel designs. This approach achieves optimal hydrogen combustion characteristics with minimal retooling costs.
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 engine achieves efficient hydrogen combustion with low emissions and maintains high torque characteristics, allowing for minimal adaptation of existing diesel engine designs and reduced retooling costs.
Implementation Method 1
the or each inlet port is configured to generate a tumbling motion of the fuel air mixture prior to ignition thereof
Implementation Method 2
at least one spark plug mounted to the cylinder head
Implementation Method 3
ignite the hydrogen fuel-air mixture
Data Source
AI summary
An internal combustion engine for use with hydrogen fuel includes at least one cylinder assembly including a combustion chamber, a cylinder, a cylinder head, and a reciprocating piston assembly. Two inlet ports within the cylinder head are selectively closable by a corresponding inlet valve, and at least one outlet port in the head is selectively closable by a corresponding outlet valve. At least one spark plug is mounted to the cylinder head, and the cylinder head comprises a first face and a second face inclined relative to one another and meeting at an apex. The two inlet ports are located within the first face and outlet port is located within the second face. Each inlet port is configured to generate a tumbling motion of the fuel air mixture prior to ignition. The cylinder head is secured by six fasteners, such as six bolts to an engine block defining the cylinder.