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FEV’s two-stage VCR system; 5-7% increase in fuel economy using variable length conrods

Green Car Congress

Use of a variable compression ratio (VCR) could be one technology approach to reducing fuel consumption in highly boosted (e.g., downsized, turbocharged) gasoline engine, as operating an engine with higher compression ratios at low load can increase fuel economy compared to operating an engine with fixed compression ratio.

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Ford launching major new product push in Europe; fuel economy and 1.0L EcoBoost engine; first Ford full hybrid car for Europe

Green Car Congress

At a “Go Further with Ford” event in Amsterdam, Ford Motor Company detailed plans for an aggressive product acceleration in Europe, targeting opportunities for growth in the large car, SUV and commercial vehicle segments while emphasizing fuel economy and enabling technologies such as the EcoBoost engines. liter EcoBoost engine.

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Hyundai plans 12 new SUV models through 2021; ICE, hybrid, PHEV, BEV; 2022 Tucson

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of torque at 4,000 rpm, with a targeted combined fuel economy of 28 mpg with front-wheel drive. This automatic transmission adds ratio range at both the top and bottom of output speeds allowing for extra thrust off-the-line and a quieter, more fuel-efficient trip on the interstate. The new Smartstream 2.5-liter

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New powertrain line-up for Hyundai 2022 Tucson

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liter engine, with high-efficiency combustion, cooled EGR and an optimized ITMS cooling system, features 187 horsepower at 6,100 rpm and 178 lb-ft (241 N·m) of torque at 4,000 rpm, with an EPA-estimated combined fuel economy of 29 mpg with front-wheel drive and 26 mpg with all-wheel drive. The new Smartstream 2.5-liter

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Audi using supplementary port fuel injection to address particulates from gasoline direct injection

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In part-load operation, the indirect injection supplements direct gasoline injection to improve fuel economy and to reduce the output of particulates from the engine. GDI technology provides fuel efficiency benefits from charge air cooling, more facile turbocharging, and the downsizing that these permit. Earlier post.).

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DOE awards Envera $2.8M to develop and to test efficient variable compression ratio engine

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The new engine will achieve high efficiency using the Atkinson Cycle with an 18:1 compression ratio, combined with aggressive engine downsizing. Envera specializes in the development of advanced technologies for improving automotive fuel economy. Engine downsizing is a key tool in improving fuel economy.

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Concept: Honda RD Developing Variable Compression Ratio Engine with Dual Piston Mechanism

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improvement in fuel economy in operation over the Japanese 10-15 cycle. When downsizing, Kato said, using a turbocharger or supercharger to offset the decrease in output can result in a fall in the knocking limit as the boosting pressure rises, causing the thermal efficiency to fall as well. and back again. Kadota et al.

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