Fuel-to-air ratio control under short-circuit conditions through UEGO sensor signal analysis
[EN] The impact of short-circuit pulses on the after-treatment system of a spark-ignited engine must be taken into account to keep the fuel-to-air equivalence ratio within the three-way catalyst window, thereby reducing pollutant emissions. The fuel-to-air equivalence ratio overestimation that suffe...
| Authors: | , , , , |
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| Format: | article |
| Publication Date: | 2020 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | English |
| OAI Identifier: | oai:riunet.upv.es:10251/161388 |
| Online Access: | https://riunet.upv.es/handle/10251/161388 |
| Access Level: | Open access |
| Keyword: | Short-circuit SI engine Fuel-to-air ratio control Three-way catalyst Emissions control MAQUINAS Y MOTORES TERMICOS |
| Summary: | [EN] The impact of short-circuit pulses on the after-treatment system of a spark-ignited engine must be taken into account to keep the fuel-to-air equivalence ratio within the three-way catalyst window, thereby reducing pollutant emissions. The fuel-to-air equivalence ratio overestimation that suffers the wide-range ¿-sensor upstream three-way catalyst in the presence of short circuit is especially relevant. In this study, a novel approach to deal with the fuel-to-air equivalence ratio control under short-circuit conditions is introduced. Under this scope, this work proposes a strategy for the on-board correction of the aforementioned fuel-to-air equivalence ratio overestimation, by means of the information regarding short-circuit level that provides the frequency content of the ¿-sensor at the engine frequency. Finally, the potential of this approach to minimize pollutant emissions, in particular the NOx penalty arisen as a consequence of running the engine under leaner conditions than expected, is assessed through experimental tests. |
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