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Title: Engine thermal management in light duty diesel engine
Author: Pang, Hon Hou
ISNI:       0000 0001 3466 5375
Awarding Body: University of Bath
Current Institution: University of Bath
Date of Award: 2006
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This thesis presents the investigation into the potential of improving the performance of Diesel engine through changes in the engine thermal management with the flexibility of integrating the changes from the engine control strategy. Analysis into previous studies in related area has identified low coolant inlet temperature, split cooling system and control of lubricant oil temperature as the features which held such potential. These features are further studied by implementing them on a mass produced Diesel engine in an experimental investigation. Although the engine response on fuel consumption and NOx output for most of the test conditions follow established trends with regard operating temperature, where higher operating temperatures increase NOx output but lowers fuel consumption, there are few unusual responses which can only be accounted by minor change in combustion characteristics. To evaluate the effect of these features, the resulting engine responses from various thermal conditions is compared against those of conventional engine control parameters. It is found that changing the thermal settings can lower the engine fuel consumption much more effectively than changing the settings of engine control parameter but the situation is reversed in the case of NOx output. Further, net improvement offered by the thermal variation is established by integrating the effect of the thermal variation within the flexibility in the fuel injection timing to produce optimised solutions. The optimised solutions indicate that there is a specific set of optimum operating temperature for the cylinder head and engine block every engine speed and load condition. The trend of the required average metal temperature required for optimum engine performance indicate the need for an active controlled engine cooling system in Diesel engine for enhanced performance.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available