The EPA's interest in driveability stems from evidence that adjustments of some vehicle engine settings to values other than those recommended by the manufacturer can improve driveability during cold start and warmup driving but often exhaust emissions and/or fuel economy suffer as a result. Because of this, EPA may eventually consider issuing driveability guidelines or standards. Such regulations must be based on quantitative test methods but current industry test procedures are primarily subjective. Consequently EPA awarded a contract to determine whether an objective procedure could be developed for assessing vehicle cold start and warmup driveability. Nearly 200 driveability tests were conducted with this car on chassis dynamometers using various driving cycles and ambient test temperatures. Throughout each test the instrument output signals and the trained raters' evaluations of performance were computer recorded. A series of computer programs were developed to identify and measure the severity of several driveability problems.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Light-Duty Vehicle Driveability Procedure Investigation


    Contributors:

    Publication date :

    1981


    Size :

    84 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English







    A European Cold-Weather Driveability Procedure

    Caddock, B. D. / Barker, R. F. / Hirst, S. L. | SAE Technical Papers | 1978


    A European Cold-Weather Driveability Procedure

    Barker,R.F. / Hirst,S.L. / Caddock,B.D. et al. | Automotive engineering | 1978