High-pressure gasoline engine problems: turbo lag. Part 1
Abstract
Introduction. A “mega-trend” in the global automotive industry, aimed at the significant (up to 20–30%) lowering of fuel consumption and CO2 emissions is the downsizing and simultaneous boosting of the gasoline internal combustion engine (ICE) to maintain or improve a passenger car rideability. The practical implementation of this concept requires solution of a number of problems the most difficult is the quality deterioration of the vehicle ride caused by the turbo lag.
Methodology and research methods. A review of the reasons and measures undertaken to minimize the turbo lag while lowering the internal combustion engine dimension is based on a comparative analysis of the results of experimental and calculated studies of the turbo lag presented in foreign and domestic publications over the past few years.
Scientific novelty and results. For the first time the main causes of the appearance of a turbo lag in a downsized gasoline engine as well as factors that allow them to be eliminated or reduced have been generalized and systematized. The best combination of ICE technology which permits turbo lag reduction is the one of a direct gasoline injection and the adjustment of a valve actuator. Both technologies increase filling due to the charge cooling, the first – due to the fuel evaporation in the cylinder, the second – due to the combustion chamber purge. The effectiveness of the new ICE technologies was evaluated: exhaust period separation, recompression, charge air supercooling, for extreme downsizing. A combined turbocharger with a mechanical or electric supercharger was recommended for extreme downsizing. The latter was compatible with the electrification of the power drive and allowed the internal combustion engine to operate almost without a turbo lag with reduced fuel consumption by 25–33% and CO2 emissions.
The practical significance of work lies in the possibility of using its results when choosing a circuit and design solutions for a promising low-dimensional gasoline engine.
About the Author
V. I. Sonkin
Federal State Unitary Enterprise “Central Scientific Research Automobile and Automotive Engines Institute” (FSUE “NAMI”)
Russian Federation
Russian Federation
engineer, head of the Research department for spark ignition engines of сenter “Power unit”
Moscow 125438
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For citations:
Sonkin V.I. High-pressure gasoline engine problems: turbo lag. Part 1. Trudy NAMI. 2019;(4):70-81. (In Russ.)
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