Variable capacity control strategy for an automobile air conditioning system

Conventional vehicle air conditioning system often uses an engine-driven compressor where it operates according to engine speed. This causes cooling capacity fluctuation that leads to low passenger thermal comfort. Furthermore, designers usually oversize the air conditioning system to speed up the c...

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Main Author:	Dahlan, Afiq Aiman
Format:	Thesis
Language:	English
Published:	2016
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/80860/1/AfiqAimanDahlanMFKM2016.pdf
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id	my-utm-ep.80860
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spelling	my-utm-ep.808602019-07-24T00:08:11Z Variable capacity control strategy for an automobile air conditioning system 2016-08 Dahlan, Afiq Aiman TJ Mechanical engineering and machinery Conventional vehicle air conditioning system often uses an engine-driven compressor where it operates according to engine speed. This causes cooling capacity fluctuation that leads to low passenger thermal comfort. Furthermore, designers usually oversize the air conditioning system to speed up the cooling time, regardless of the ambient condition and vehicle speed, which leads to high energy and fuel consumption of the vehicle. Thus, this research investigates the feasibility of independent electric direct current (DC) compressor retrofit into conventional petrol vehicle air conditioning system and while developing an intelligent fuzzy logic controller (FLC) for better control of the vehicle compartment temperature and lower the fuel consumption. This study was implemented on a compact passenger vehicle with original engine-driven compressor air conditioning system. First, the average cabin temperature, air conditioning performance and fuel consumption of the vehicle with original engine-driven compressor was obtained. Second, the DC compressor was retrofitted and the original on/off controller was used. The steady-state vehicle compartment temperature was also measured at various DC compressor speed to support the development of the FLC for variable speed control (VSC). Next, the VSC was implemented and all the data were compared. The experiments were carried out on a chassis dynamometer (or called rolling road) with variable internal heat load and temperature setting. The results indicate that the variable capacity control strategy on the DC compressor with the FLC control system give positive results, with lower fuel consumption, higher coefficient of performance (COP) and enhanced temperature control compared to engine driven compressor with on/off controller and DC compressor with on/off controller. The implementation of the intelligent DC compressor system gives higher energy efficiency to vehicles while providing better temperature control, thus enhancing the driving experience. 2016-08 Thesis http://eprints.utm.my/id/eprint/80860/ http://eprints.utm.my/id/eprint/80860/1/AfiqAimanDahlanMFKM2016.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Dahlan, Afiq Aiman Variable capacity control strategy for an automobile air conditioning system
description	Conventional vehicle air conditioning system often uses an engine-driven compressor where it operates according to engine speed. This causes cooling capacity fluctuation that leads to low passenger thermal comfort. Furthermore, designers usually oversize the air conditioning system to speed up the cooling time, regardless of the ambient condition and vehicle speed, which leads to high energy and fuel consumption of the vehicle. Thus, this research investigates the feasibility of independent electric direct current (DC) compressor retrofit into conventional petrol vehicle air conditioning system and while developing an intelligent fuzzy logic controller (FLC) for better control of the vehicle compartment temperature and lower the fuel consumption. This study was implemented on a compact passenger vehicle with original engine-driven compressor air conditioning system. First, the average cabin temperature, air conditioning performance and fuel consumption of the vehicle with original engine-driven compressor was obtained. Second, the DC compressor was retrofitted and the original on/off controller was used. The steady-state vehicle compartment temperature was also measured at various DC compressor speed to support the development of the FLC for variable speed control (VSC). Next, the VSC was implemented and all the data were compared. The experiments were carried out on a chassis dynamometer (or called rolling road) with variable internal heat load and temperature setting. The results indicate that the variable capacity control strategy on the DC compressor with the FLC control system give positive results, with lower fuel consumption, higher coefficient of performance (COP) and enhanced temperature control compared to engine driven compressor with on/off controller and DC compressor with on/off controller. The implementation of the intelligent DC compressor system gives higher energy efficiency to vehicles while providing better temperature control, thus enhancing the driving experience.
format	Thesis
qualification_level	Master's degree
author	Dahlan, Afiq Aiman
author_facet	Dahlan, Afiq Aiman
author_sort	Dahlan, Afiq Aiman
title	Variable capacity control strategy for an automobile air conditioning system
title_short	Variable capacity control strategy for an automobile air conditioning system
title_full	Variable capacity control strategy for an automobile air conditioning system
title_fullStr	Variable capacity control strategy for an automobile air conditioning system
title_full_unstemmed	Variable capacity control strategy for an automobile air conditioning system
title_sort	variable capacity control strategy for an automobile air conditioning system
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2016
url	http://eprints.utm.my/id/eprint/80860/1/AfiqAimanDahlanMFKM2016.pdf
_version_	1747818271692816384

Variable capacity control strategy for an automobile air conditioning system

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