Development of a Hydrogen Engine for Light Commercial Vehicles

Ryosuke Matsui･Tomihisa Tsuchiya･Michito Shirakawa･Taketo Nagasaki･Toru Sakuma･Satoshi Ido･Yasuhiro Haruna･Kazuya Nakata (Toyota Motor)･Akihiro Ando (SOKEN)

To promote hydrogen adoption, we developed a hydrogen engine for light commercial vehicles. Based on a V6 3.5L turbocharged gasoline engine, over 90% of parts were reused while achieving 40% thermal efficiency and meeting Euro 7 emission standards. This presentation will address technical challenges such as abnormal combustion caused by hydrogen and the solutions implemented.

Development of Ammonia/Hydrogen SI Engine
-Impact of Port Fuel Injection Applied to the Ammonia/Hydrogen Fuel Supply System on Engine Performance-

Naoki Muta･Kosuke Kusaba･Hiroaki Masatsuki･Tomohiro Nishihashi･Tomonori Kuroki･Yukihide Nagano･Masato Sawashita･Yuta Shima･Kazuya Naito･Tatsuya Ehara (Daihatsu Motor)

The ammonia/hydrogen spark ignition engine will be developed as one of the engines using the carbon-neutral fuel. This study aims to evaluate the impact of adopting a port fuel injection (PFI) system for the supply of an ammonia/hydrogen mixture on engine performance. Building upon the direct-injection (DI) hydrogen jet model developed in our previous work, a new PFI jet model was formulated. Engine simulations and performance assessments were conducted for the PFI-based supply system.

Combustion Studies on a Large-Bore Pent-Roof Spark-Ignited Hydrogen Engine

Thomas E. Briggs･Daniel Ryan Williams･Julian M. Wallace (Southwest Research Institute)･Tomoyuki Itou (Isuzu Motors)

A pent-roof combustion chamber design was adapted from a previous natural gas engine demonstration to allow for single-cylinder engine combustion studies on PFI and LPDI hydrogen operation. Comparisons were made of the impact of tumble and injector type on the efficiency and performance of this engine. The results demonstrated an improvement in efficiency for LPDI relative to PFI and that tumble ratio did not have a strong impact on hydrogen combustion. Peak net indicated thermal efficiency of 46% was measured, with engine-out NOX emissions and engine out exhaust temperature at levels which are compatible with standard lean-NOX aftertreatment solutions.