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Arief Hariyanto
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Mechanical Engineering

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PENGARUH PERUBAHAN TEMPERATUR AIR PENDINGIN TERHADAP SAAT PENYALAAN PADA MOTOR BENSIN Tri Yuswidjajanto Zaenuri; Arief Hariyanto; Harki Apri Yanto
Mesin Vol. 18 No. 1 (2003)
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This paper contains the testing of a spark ignition engine to observe the influence of the engine temperature variation on the ignition timing. The engine temperature of Toyota 7K equipped with EFI self developed by LMBSP is varied and the performance test is conducted over the variations of load and rpm, which simulate the real condition on the road. The aim of the experiments is to yield the ignition timing which produces the optimum performance at any load condition.
EFFECTS OF HYDROGEN ADDITION INTO INTAKE AIR ON THE HYDROCARBON EMISSION OF GASOLINE ENGINES AT COLD START CONDITION Arief Hariyanto; Wiranto Arismunandar; Gerard George Engel
Mesin Vol. 22 No. 2 (2007)
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Start process, particularly cold start condition is considered important to be focused in terms of emission reduction due to high unburned hydrocarbon (HC) concentration in the exhaust gas. Several methods have been proposed and implemented for reducing exhaust gas emission during starting condition. In this paper will be discussed the addition of hydrogen into intake air in order to reduce the level of HC emission during cold start condition. Using this method, the combustion process during starting will be improved to produce better combustion. This paper describes an experiment conducted to find the optimal amount of hydrogen added on start process at various coolant temperatures, which is effective to reduce the total HC concentration at each start temperature, respectively. The results show that the HC concentration in the exhaust gas is influenced by the temperature of engine and can be reduced significantly by hydrogen addition into intake air.
Co-Authors Gerard George Engel Harki Apri Yanto Wiranto Arismunandar Zaenuri, Tri Yuswidjajanto