A New CRC Cold-Start and Warm-Up Driveability Test and Associated Demerit Weighting Procedure for MPFI Vehicles

Jorgensen, Scott W.; Musser, George; Uihlein, James P.; Evans, Beth

doi:10.4271/962024

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…The driveability of the vehicle itself is based on subjective ratings by trained raters who drive it through a specified test cycle. The raters give demerit points on the stumble (the intermittent loss of power), the idle roughness, the surge (the cyclic pulses of power), the hesitation (the lack of response to opening the throttle), the difficulty of starting and the engine stalls; 23, 24 these ratings are aggregated. Driveability demerits usually show a correlation with the DI.…”

Section: Volatilitymentioning

confidence: 99%

Fuel requirements of spark ignition engines

Kalghatgi

Stone

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper reviews the fundamental requirements of liquid hydrocarbon fuels for spark ignition engines, namely that the fuel should vaporise satisfactorily and burn in a controlled manner. The phenomenon of knock and the development of the octane scale are discussed. The variation in the pressure–time histories for different engines is discussed, together with the reason why this leads to different fuel requirements. The difference in the octane rating tests and the way in which engine downsizing exacerbates these differences in the pressure–time histories are discussed. The applicability of the research octane number and the motor octane number to modern engines is reviewed, together with the phenomena of low-speed pre-ignition and superknock. The effects of the hydrocarbon fuel distillation characteristics on the driveability and the emissions are reviewed and discussed with respect to the historical context and the current legislative requirements. Brief mention is made of other fuel requirements such as the density, the gum content and the aromatic content.

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Section: Volatilitymentioning

confidence: 99%