The worldwide interest in combustion control is devoted mainly to optimize internal combustion engines performances and met standard emission of car exhaust. Different types of sensors were investigated as combustion sensors, but actually solid state electrochemical sensors based on stabilized zirconia (lambda probe) are implemented in injection systems to control air/fuel ratio. The aim of this work is to show results obtained on solid state thin film TiO2 gas sensors investigation as lambda probe. Miniaturized semiconductor gas sensor are manufactured using sol-gel and microelectronic technology on alumina substrate. The sensitive element consists of a semiconducting metal oxide layer, in particular. Titanium oxide layer and the measurement of specific oxidizing or reducing gases are based on reversible conductivity change of the sensing element at an appropriate working temperature. In this paper the authors test sol-gel TiO2 thin film sensors for automotive applications in order to control and improve the economy, power, vibration, and mainly emission of an internal combustion engine. They compare the commercial lambda probe with thin film TiO2 sensor. TiO2 thin film sensor seems to be a promising tool for controlling and monitoring exhaust gas of engine of internal combustion. In this work they compare the signal of commercial lambda sensor and TiO2 sensor in order to evaluate the feasibility of this probe. It presents a light delay compared with the signal of commercial probe but they think to dope with Pd and Pt this thin film at the aim to improve time delay, stability and reproducibility. However the replacement of Au contacts with Pt contacts produces a long term reliability.
Optimization of combustion control by sensors based on TiO2 thin film
2004
5 Seiten, 3 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
Sol-Gel Tio2 Thin Film Sensors For Combustion Control In Automotive Applications
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