Development Of Variable Valve Timing Mechanism For Compressed Air Engine

Compressed air engine (CAE) is divided into two types. First type is the fabricated CAE for mobile vehicle and the second type is the retrofitting of compressed air into Spark Ignition Engine and most researches are concentrating on the second type. Retrofit CAE researches use a fixed camshaft lo...

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Main Author:	Ahmad, Fathul Hazrimy
Format:	Thesis
Language:	English
Published:	2019
Subjects:	T Technology TJ1-1570 Mechanical engineering and machinery
Online Access:	http://eprints.usm.my/46711/1/Development%20Of%20Variable%20Valve%20Timing%20Mechanism%20For%20Compressed%20Air%20Engine.pdf
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spelling	my-usm-ep.467112021-11-17T03:42:12Z Development Of Variable Valve Timing Mechanism For Compressed Air Engine 2019-06 Ahmad, Fathul Hazrimy T Technology TJ1-1570 Mechanical engineering and machinery Compressed air engine (CAE) is divided into two types. First type is the fabricated CAE for mobile vehicle and the second type is the retrofitting of compressed air into Spark Ignition Engine and most researches are concentrating on the second type. Retrofit CAE researches use a fixed camshaft lobe as in spark ignition engine. This will make the separation angle between inlet valves open and exhaust valve open fixed and between inlet valves close and exhaust valve close fixed. The purpose of this thesis is to design and develop a CAE that uses an independent valve timing and duration setting of inlet and outlet valves of a compressed air engine in order to identify the best valve timing and duration. This was done by controlling the different angles of valve timing for inlet and outlet compressed air using solenoid valves. Compressed air was fed into the CAE with a certain pressure. The brake power was applied slowly by using a Prony Brake. The different configurations settings of pressure, opening and closing angle of inlet and outlet valves were used in order to find the performance of the CAE. The experiments start from TDC for valve inlet opening, and closing at BDC and valve outlet will start at BDC for opening and TDC for closing. The brake power, the engine speed, and efficiency, at the valve angles setting were recorded. The valve angles setting were from 10° ATDC to 25° ATDC for inlet valve and 140° ATDC to BCD, for outlet valve with an interval of 5° interval. The experiment used a combination of these valve setting were performed 3 times at every setting. This CAE research on variable valve angle setting makes the methodology applicable for studying different angle setting for inlet and outlet of compressed air in the CAE. The best result achieved were at 10° ATDC for inlet opening and outlet closing and 170° ATDC for inlet closing and outlet opening which have an efficiency of 24.58 %. The pressures setting for this experiment were from 1 bar to 3 bar with an interval of 0.5 bar. 2019-06 Thesis http://eprints.usm.my/46711/ http://eprints.usm.my/46711/1/Development%20Of%20Variable%20Valve%20Timing%20Mechanism%20For%20Compressed%20Air%20Engine.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Mekanik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology TJ1-1570 Mechanical engineering and machinery
spellingShingle	T Technology TJ1-1570 Mechanical engineering and machinery Ahmad, Fathul Hazrimy Development Of Variable Valve Timing Mechanism For Compressed Air Engine
description	Compressed air engine (CAE) is divided into two types. First type is the fabricated CAE for mobile vehicle and the second type is the retrofitting of compressed air into Spark Ignition Engine and most researches are concentrating on the second type. Retrofit CAE researches use a fixed camshaft lobe as in spark ignition engine. This will make the separation angle between inlet valves open and exhaust valve open fixed and between inlet valves close and exhaust valve close fixed. The purpose of this thesis is to design and develop a CAE that uses an independent valve timing and duration setting of inlet and outlet valves of a compressed air engine in order to identify the best valve timing and duration. This was done by controlling the different angles of valve timing for inlet and outlet compressed air using solenoid valves. Compressed air was fed into the CAE with a certain pressure. The brake power was applied slowly by using a Prony Brake. The different configurations settings of pressure, opening and closing angle of inlet and outlet valves were used in order to find the performance of the CAE. The experiments start from TDC for valve inlet opening, and closing at BDC and valve outlet will start at BDC for opening and TDC for closing. The brake power, the engine speed, and efficiency, at the valve angles setting were recorded. The valve angles setting were from 10° ATDC to 25° ATDC for inlet valve and 140° ATDC to BCD, for outlet valve with an interval of 5° interval. The experiment used a combination of these valve setting were performed 3 times at every setting. This CAE research on variable valve angle setting makes the methodology applicable for studying different angle setting for inlet and outlet of compressed air in the CAE. The best result achieved were at 10° ATDC for inlet opening and outlet closing and 170° ATDC for inlet closing and outlet opening which have an efficiency of 24.58 %. The pressures setting for this experiment were from 1 bar to 3 bar with an interval of 0.5 bar.
format	Thesis
qualification_level	Master's degree
author	Ahmad, Fathul Hazrimy
author_facet	Ahmad, Fathul Hazrimy
author_sort	Ahmad, Fathul Hazrimy
title	Development Of Variable Valve Timing Mechanism For Compressed Air Engine
title_short	Development Of Variable Valve Timing Mechanism For Compressed Air Engine
title_full	Development Of Variable Valve Timing Mechanism For Compressed Air Engine
title_fullStr	Development Of Variable Valve Timing Mechanism For Compressed Air Engine
title_full_unstemmed	Development Of Variable Valve Timing Mechanism For Compressed Air Engine
title_sort	development of variable valve timing mechanism for compressed air engine
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Mekanik
publishDate	2019
url	http://eprints.usm.my/46711/1/Development%20Of%20Variable%20Valve%20Timing%20Mechanism%20For%20Compressed%20Air%20Engine.pdf
_version_	1747821715768999936

Development Of Variable Valve Timing Mechanism For Compressed Air Engine

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