Development of the Poppet Type Exhaust Valve in the Internal Combustion Engine: Part I 1860–1930

3D modeling has widely been used because of their ease in visualization, understanding and generation of manufacturing drawing sheets compared to 2D drafting. 3D Modeling is the timeconsuming process and many draftsmen does not have the skill to draw a 3D object inside a CAD packages. Internal combustion engine consists of two type of valves inlet valve and exhaust valve. The pair of inlet and exhaust valve is called as poppet valves. Exhaust valve is the mechanical object reputedly required nearly in all internal combustion engines. In this paper we are automate the exhaust valve design by creating graphical user tool using visual basic programming language inside the Microsoft excel spreadsheet. This excel spreadsheet is later integrated to CREO database for automatic 3D valve Modeling. Exhaust valve is the nose of the internal combustion engine to eject the exhaust gases out form the engine at a time of exhaust stroke. It is continuously come under the high temperature and pressure. Steady state thermal analysis has been carried out using FEA. To demonstrate our study, we are considered to design and analysis the exhaust valve for Honda CB Twister 110cc having chamfer angle of 45 degrees. For the 3D modeling we use CREO and ANSYS 18.0 is used for FEA analysis.

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SIMULATION OF INTAKE AND EXHAUST VALVE TIMING ON INTERNAL COMBUSTION ENGINE

Jurnal Teknologi ◽

10.11113/jt.v79.12264 ◽

2017 ◽

Vol 79 (7-4) ◽

Author(s):

Afiq Aiman Dahlan ◽

Mohamad Shahrafi ◽

Mohd Farid Muhamad Said

Keyword(s):

Internal Combustion Engine ◽

Power Output ◽

Combustion Engine ◽

Internal Combustion ◽

Exhaust Valve ◽

Miller Cycle ◽

Average Percentage ◽

Percentage Difference ◽

Average Percentage Difference ◽

Opening And Closing

Internal combustion engine in automotive industry is widely researched to increase its efficiency and power output. Valve system in modern internal combustion engine control the opening and closing timing of intake and exhaust stroke. Its duration affects the performance of the engine at both power output and fuel efficiency. Therefore, this study discusses about the Miller cycle concept that alter the duration of both intake and exhaust valve opening and closing characteristics. The study focusses mainly on finding the optimum timing characteristics on Proton Iriz gasoline engine. A 1-dimensional model has been built using a commercial software called GT-POWER for engine simulation purpose. The engine is then calibrated with the simulation model. The optimization was run in this software to find the best optimum timing of intake and exhaust valve for two categories which are targeting performance and fuel consumption. The results show positive trends in the BSFC results with the maximum percentage difference of 26.27% at 6,250 rpm. The average percentage difference in the BSFC results is 14.12%. For targeting performance, the overall results show an increasing trend in the brake torque curves with maximum percentage difference is 9.83%. The average percentage difference in brake torque is found to be 3.12%. Therefore, this paper concludes that Miller cycle implementation give minimal performance increment. The targeting performance and fuel consumption optimization can also be implement for changing mode of driving. However, the increase compression ratio would also give adverse effects on engine performance and endurance. The Miller cycle is also more suitable to be implement on force induction system.

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