A Study on the Performance Limitations and Improvements of a Gasoline-Engine Based VGT Hydrogen Engine Using an Experiment-Based Mean-Value Engine Model

Document Type

Article

Publication Date

1-1-2026

Abstract

With increasing interest in development of hydrogen engines and their utilization, more attention is being paid to solutions to overcome the technological challenges of hydrogen engines. One approach for efficient hydrogen engine development is the modification of existing engines. In the present study, a modified WGT direct injection hydrogen engine based on a small gasoline engine was constructed. Based on experimental results, an average VGT engine model was developed to predict engine performance at full-load and examine various factors affecting engine efficiency. The analysis using the model suggests that improving engine full-load performance requires not only extending the performance limits of the turbocharger but also improving the mechanical limit of the combustion chamber, such as increasing the maximum cylinder pressure. Furthermore, the engine energy balance analysis suggests that applying a higher compression ratio and improving combustion efficiency are crucial in improving performance.

Publication Title

International Journal of Automotive Technology

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