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A Method for Estimating Soot Load in a DPF using an RF-based Sensor
Linköpings universitet, Institutionen för systemteknik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för systemteknik. Linköpings universitet, Tekniska högskolan.
2012 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgaveAlternativ tittel
En metod för skattning av sotmassan i en DPF med RF-baserad sensor (svensk)
Abstract [en]

The European emission standard is an EU directive which describes what emission limits car manufactures are required to meet. In order to meet these requirements car manufacturers use different techniques and components. In a modern diesel automobile a Diesel Particulate Filter (DPF) is used to gather soot from the exhausts. As soot accumulates in the DPF, the back pressure increases and the capability to hold more soot decreases. Therefore the DPF continuously needs to get rid of the stored soot. The soot is removed through a process called regeneration. In order to optimize when to perform regeneration, it is vital to know the amount of soot in the filter.

A method for estimating the soot mass in a DPF using a radio frequency-based sensor has been developed. The sensor that has been studied is the Accusolve soot sensor from General Electric. A parameter study has been performed to evaluate the parameters that affects the sensor’s output. Parameters that have been studied include positioning of the sensor, temperature in the DPF, flow rate through the DPF and distribution of soot in the DPF. Different models for estimation of soot mass in the DPF has been developed and analyzed.

An uncertainty caused by removing the coaxial cable connectors when weighing the DPF has been identified and methods for minimizing this uncertainty has been presented. Results show that the sensor output is sensitive to temperature, soot distribution and position, and also show some sensitivity to the flow rate. An ARX model, with only one state, is proposed to estimate the soot mass in the DPF, since it gives the best prediction of soot mass and showed good resistance to bias errors and noise in all the input signals.

sted, utgiver, år, opplag, sider
2012. , s. 77
Emneord [en]
Soot Sensor, Diesel Particulate Filter, Black Box, Average Gain
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-77970ISRN: LiTH-ISY-EX--12/4584--SEOAI: oai:DiVA.org:liu-77970DiVA, id: diva2:535349
Eksternt samarbeid
Volvo Cars
Fag / kurs
Vehicular Systems
Presentation
2012-06-11, Algoritmen, Linköping, 10:00 (svensk)
Uppsök
Technology
Veileder
Examiner
Tilgjengelig fra: 2012-06-21 Laget: 2012-06-01 Sist oppdatert: 2012-09-10bibliografisk kontrollert

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