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Tran, Thu Huong Thi
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Effects of Ethanol Ratio and Temperature on Gasoline Atomizing Using Local-Contact Microwave-Heating Injector

Kanazawa Univ.-Thu Huong Thi Tran, Hiroshi Enomoto, Kosuke Nishioka, Motoki Kushita, Takaaki Sakitsu, Naoki Ebisawa
Published 2011-11-08 by Society of Automotive Engineers of Japan in Japan
Improvement of atomization process is one of the most effective methods to promote the cold-start period of an internal combustion engine (ICE) using port fuel injector (PFI). In this paper authors present a fuel heating method using microwave energy through the local-contact microwave-heating injector (LMI) to enhance the properties of fuel sprays in such a risky working area of ICE. Temperature and mixing ratios of blended fuel are varied and characteristics of atomization are investigated. The fuel using in experiments is blended fuel of gasoline and ethanol, the mixing ratio is varied among 0 (E0), 5 (E5), 50 (E50), and 100 (E100) percentages in volume ratio of ethanol. The temperature of the fuel is measured just before the injection by using K-typed sheath thermo-couple. Spray characteristics measured are Sauter Mean Diameter (SMD), droplet size distribution, spray cone angle, and particle size distribution width. The SMD and the droplet size distribution are measured by using laser diffraction method. The spray cone angle is measured through pictures of actual appearance atomization. The results show that, the higher…
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Development of Small Gasoline Engine with Electronic Variable Valve Timing Unit

Kanazawa Univ.-Thu Huong Thi Tran, Hiroshi Enomoto, Kosuke Nishioka, Kenichi Simizu
Published 2011-11-08 by Society of Automotive Engineers of Japan in Japan
This paper investigates influences of intake and exhaust valves overlap (at this duration, both of the intake valve and exhaust valve are open) on engine performance. An electric, variable cam phase mechanism (VVT, Variable Valve Timing unit) is installed in a small gasoline engine. The influences on the engine torque and BSFC, Brake Specific Fuel Consumption, are investigated on the engine bench. In addition, in case the overlaps exceeding the experimental range an engine simulator is used to predict the effects.The experimental results indicate that the VVT system can adjust the target overlap with the accuracy of 1.5deg. in a range of engine speed from 3000rpm to 7000rpm. The response time of the VVT unit was observed at the engine speed of 3000rpm. The results show that the rotation direction of motor affects on the response time of the unit. The measurement of engine torque and BSFC is performed for several overlap values at each engine speed. As a result, by extending overlap using VVT unit, the engine torque can improve in whole range of…
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Feed-Back Control of Ignition Timing Using Peak Cylinder Pressure Angle with Rough Timing Table

Kanazawa Univ.-Thu Huong Thi Tran, Hiroshi Enomoto, Kosuke Nishioka, Kenichi Shimizu
Published 2011-11-08 by Society of Automotive Engineers of Japan in Japan
Cylinder pressure is used for the closed-loop ignition angle control of a gasoline engine. This paper focused on the crank angle position where the maximum cylinder pressure reached (θPmax) and the relationship between the θPmax and the ignition angle. This closed-loop control set the θPmax a target value with an initial ignition angle and does not need a detailed ignition angle map. Response time and deflection with the target value are examined with a test bench. The θPmax target, ATDC 18 deg. is confirmed in consideration of the effect of knocking and the exhaust gas composition. The target ignition angle was varied step by step within a limit of upper and lower values, the response was observed and each gain was decided. At the engine speed of 5000 rpm, the duration to reach a steady value of θPmax is 0.10 s and the response time of ignition angle is 0.02 s. The response time is almost the same of two crankshaft revolutions; hence, an adequate performance is reliable because it can support the burning of…
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