An open loop carbureted GM 5.7L engine has been converted to operate either as carburetor gasoline, or as a closed loop controlled compressed natural gas (CNG) fueled system. In the gasoline mode, fuel delivery is made through the stock four barrel carburetor, however, the stock mechanical advance ignition distributor has been replaced with later model utilizing electronically controlled spark advance. In the CNG fuel mode, stoichiometric fuel delivery is achieved with the use of two Servojet HSV injectors mounted in a central distribution center and controlled by a microprocessor. Closed loop control is obtained through the use of a stock GM heated gasoline oxygen sensor.In order to provide proper distribution of the CNG fuel with the intake air with the use of only two injectors, a constant flow multipoint injection system was developed to assure that each cylinder would receive equivalent masses of fuel. In this system, the fuel at 1.4 MPa absolute pressure first passes through the choked flow gas injectors into a central distribution plenum and is reduced to a minimum pressure of 0.7 MPa. The CNG fuel leaves the plenum through eight individual converging nozzles which direct the gas to each respective intake port. Tests demonstrate the systems ability to provide an even distribution of fuel to each intake port over a wide range of flow rates.The gasoline oxygen sensor employed in this study provides a lean biased signal when used to indicate stoichiometry in a CNG produced exhaust mixture. To correct this error on the feed back loop, the proportional-integral control algorithm was modified to correct for the true stoichiometric exhaust air-fuel ratio.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Dual Fuel CNG Retrofit for Mexican Public Transit


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Randolph, D. (Autor:in) / Beck, N. J. (Autor:in) / Weseloh, W. (Autor:in)

    Kongress:

    Future Transportation Technology Conference & Exposition ; 1995



    Erscheinungsdatum :

    1995-08-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Dual Fuel CNG Retrofit for Mexican Public Transit

    Randolph, D. / Weseloh, W. / Beck, N. J. et al. | British Library Conference Proceedings | 1995


    Dual fuel CNG retrofit for Mexican public transport

    Randolph,D. / Weseloh,W. / Beck,N.J. et al. | Kraftfahrwesen | 1995


    Container feeder retrofit from Diesel to dual fuel propulsion

    Spindler,T. / MAN,Muenchen,DE | Kraftfahrwesen | 2016


    Container-feeder Retrofit from Diesel to Dual-fuel Propulsion

    Spindler, Thomas | Online Contents | 2016


    Unique Rehabilitation and Retrofit Procedures for Rail-Transit Structures

    American Public Transit Association | British Library Conference Proceedings | 1993