ECU Strategies in Management and Control of Catalyst and Oxygen Sensors Before Activation of Lambda Control

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Ameri, Hamed | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42823 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Mozafari, Ali Asghar; Saidi, Mohammad Hasan
Abstract:
Recent stringent HC and CO emission regulations are because of increasing consciousness of the perilous influences of exhaust emissions. The chief attempt to pass the standards is to decrease the emissions during cold-start, due to catalytic converters are not efficient until they arrive a light-off temperature. It has been discovered that 50% to 80% of the controlled HC and CO emissions are sent out from tailpipe of automotive during the cold-start. Therefore, in order to minimize the cold-start emissions and fast light-off of catalytic converters, it is important to understand the catalytic converter characteristics and techniques for rapid warm-up catalyst. This thesis describes a experiment to find the light-off temperature of catalytic converters and a cold-start catalytic converter model to understand the main parameters that effect on light-off time of catalytic converter. Then these parameters are examined on catalytic converter. The present result show that temperature and rate of exhaust gas have a great influence on the temperature of catalyst.
Keywords:
Cold Cranking ; Calibration ; Lambda Modulation ; Electronic Control Unit (ECU) ; Automotive Emissions ; Light-Off Temperature

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