Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551176
Title: Engine optimization for downsizing by experiment and by simulation
Author: Piddock, Mitchell James
Awarding Body: University of Bath
Current Institution: University of Bath
Date of Award: 2010
Availability of Full Text:
Access through EThOS:
Abstract:
Increasing environmental constraints have led to a corresponding increase in engine complexity. As a result there is more of a requirement to fully understand and manage the task of hardware selection and engine optimization. Traditionally undertaking these tasks in either experimental or simulation environments would be highly time and cost inefficient and iterative. A technique is developed whereby data is merged from a variety of sources thus reducing the aforementioned problems whilst still retaining high system knowledge. Technologies relating to engine downsizing are focused on since it has been identified as one of the more promising methods in meeting future CO2 constraints. Engine downsizing is a smaller highly boosted engine performing the same role of a larger engine with reduced heat and frictional losses. In order to address these issues this research develops a range of techniques that enable technologies such as high boost, variable valve actuation (WA) , variable compression ratio (VCR) and exhaust gas recirculation (EGR) to be evaluated as part of the overall powertrain optimization process. A novel experimental data merging process proved to be the most successful method and showed improved accuracy over simulation studies, particularly with reference to NOx and BSFC. As part of the experimental work in capturing high boost data a novel charge air handling unit is employed. This emulates the effects of boosting hardware as opposed to having to develop prototype hardware itself. The advantage is it can operate outside the production envelope and is thus capable of emulating a variety of current and future boosting strategies. Within this research the charge air handling unit reaches 2 bar boost irrespective of engine speed, although there is capacity to go up to 3 bar with a reduced compression ratio engine and uprated gaskets. Further development of the technique at full load will give the automotive engineer an invaluable tool to make informed powertrain selection choices early in the development cycle, thus reducing cost and potential problems at later stages.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.551176  DOI: Not available
Share: