Abstract
A 2.0L nature aspirate gasoline engine was modified to port fuel injection (PFI) hydrogen internal combustion engine (HICE) and a series dynamometer tests were carried out. The in-cylinder combustion process was analyzed, the performance, thermal efficiency and emissions of HICE with various mixture equivalence ratios was summarized. The experimental results showed: While 20~25% lower torque compared with gasoline is observed for this naturally aspirated hydrogen engine, peak efficiencies of 45 % were achieved with brake thermal efficiency above 30% over a wide range of operating conditions. NOx emission was quite a little when the mixture equivalence ratio lower than 0.55 or higher than 1.NOx emission reached peak level at equivalence ratio between0.8 and 0.9. Finally the hydrogen engine was installed in a vehicle and the vehicle emission fully satisfied the Euro VI mission standard.
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