A crucial parameter influencing the formation of pollutant gases in internal combustion engines is the air-to-fuel ratio (AFR). During transients on gasoline and diesel engines, significant AFR excursions from target values can occur, but cycle-by-cycle AFR resolution, which is helpful in understanding the origin of deviations, is difficult to achieve with existing hardware. This is because current electrochemical devices such as universal exhaust gas oxygen (UEGO) sensors have a time constant of 50-100 ms, depending on the engine running conditions. This paper describes the development of a fast reacting device based on a wide band lambda sensor which has a maximum time constant of ~20 ms and enables cyclic AFR measurements for engine speeds of up to ~4000 rpm. The design incorporates a controlled sensor environment which results in insensitivity to sample temperature and pressure. In order to guide the development process, a computational model was developed to predict the effect of pressure and temperature on the diffusion mechanism. Investigations regarding the sensor output and response were carried out, and sensitivities to temperature and pressure are examined. Finally, engine measurements are presented.


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    Title :

    Fast response air-to-fuel ratio measurements using a novel device based on a wide band lambda sensor


    Additional title:

    Schnelle Kraftstoff-Luft-Gemischmessung mit einem neuartigen Breitband-Lambda-Sensor


    Contributors:
    Regitz, S. (author) / Collings, N. (author)

    Published in:

    Measurement Science and Technology ; 19 , 7 ; 075201/1-075201/10


    Publication date :

    2008


    Size :

    10 Seiten, 23 Bilder, 1 Tabelle, 13 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Study of Cycle-By-Cycle Air-to-Fuel Ratio Determined from the Exhaust Gas Composition and a Novel Fast Response Device Based on a Wide Band Lambda Sensor

    Regitz, S. / Collings, N. / Society of Automotive Engineers | British Library Conference Proceedings | 2008



    New Lambda - Lambda Air-Fuel Ratio Feedback Control

    Goto, Hideki / Takubo, Hideki / Umeno, Takahiro | SAE Technical Papers | 2007


    New lambda-lambda air-fuel ratio feedback control

    Takubo,H. / Umeno,T. / Goto,H. et al. | Automotive engineering | 2007