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Modelling and control of automotive ...

Shaw, Byron Thomas, II.

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Modelling and control of automotive coldstart hydrocarbon emissions.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Modelling and control of automotive coldstart hydrocarbon emissions./
作者:	Shaw, Byron Thomas, II.
面頁冊數:	112 p.
附註:	Chair: J. Karl Hedrick.
Contained By:	Dissertation Abstracts International63-09B.
標題:	Engineering, Automotive. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063544
ISBN:	0493824375

Modelling and control of automotive coldstart hydrocarbon emissions.
Shaw, Byron Thomas, II.

Modelling and control of automotive coldstart hydrocarbon emissions. - 112 p.

Chair: J. Karl Hedrick.

Thesis (Ph.D.)--University of California, Berkeley, 2002.

The control algorithms developed take into account that AFR is available for measurement. Alternatively, AFR can be estimated from cylinder pressure using heat release analysis or crankshaft acceleration.

ISBN: 0493824375Subjects--Topical Terms:

1018477
Engineering, Automotive.

Modelling and control of automotive coldstart hydrocarbon emissions.
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245 1 0 $a Modelling and control of automotive coldstart hydrocarbon emissions.
300 $a 112 p.
500 $a Chair: J. Karl Hedrick.
500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4341.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2002.
520 $a The control algorithms developed take into account that AFR is available for measurement. Alternatively, AFR can be estimated from cylinder pressure using heat release analysis or crankshaft acceleration.
520 $a The problem of coldstart Hydrocarbon (HC) emissions from spark-ignition internal combustion engines is addressed in this dissertation. Up to 90% of HC pollution emitted by an automobile comes from the first 120 seconds of operation, known as the coldstart period.
520 $a A catalytic converter model is developed to predict the coldstart warmup behavior of the catalyst, accounting for heat transfer from the exhaust and to the surroundings. Heat generation of Carbon Monoxide (CO) and HC oxidation is taken into account and the catalyst conversion efficiency is parameterized using a 2-dimensional Wiebe function of air-fuel ratio (AFR) and temperature. Results show Oxygen storage of the catalyst can be neglected during coldstart conditions. Overall agreement of the model prediction of catalyst temperature with experimental data is very good.
520 $a A simplified combustion model of the engine is developed based on heat release analysis where the parameters of the burn profile are dependent on ignition timing and fuel flow rate. Intake manifold filling and fuel flow dynamics are added to the model to account for the dynamic development of in-cylinder AFR. Simulation results show the engine model behaves as expected with variations of the control inputs.
520 $a The desired engine exhaust properties are derived from the catalyst model. It is shown that the most important exhaust property to enable quick lightoff of the catalyst and reduced cumulative tailpipe HC emissions is the exhaust gas temperature. Variation of AFR, and hence HC, can provide additional warmup of the catalyst due to exothermic oxidation in the catalyst, thereby reducing overall HC emissions.
520 $a Tracking of desired exhaust gas temperature, AFR, and idle speed is maintained using sliding mode control laws. The engine is able to track the desired exhaust profiles with very good performance due to the relatively fast dynamics of the engine compared to the thermal dynamics of the catalytic converter.
590 $a School code: 0028.
650 4 $a Engineering, Automotive. $3 1018477
650 4 $a Engineering, Mechanical. $3 783786
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710 2 0 $a University of California, Berkeley. $3 687832
773 0 $t Dissertation Abstracts International $g 63-09B.
790 $a 0028
790 1 0 $a Hedrick, J. Karl, $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063544