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NREL announces $18M investment in 9 new projects to advance medium- and heavy-duty natural gas vehicle technologies

Green Car Congress

will address natural gas engine emissions and efficiency improvements by developing a natural gas specific combustion design utilizing optimized in-cylinder charge motion and cooled exhaust gas recirculation (EGR). Cummins Inc. g/bhp-hr NO x capability with reduced aftertreatment cost; and demonstrating a diesel-like torque curve.

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Alternative Fuel Technologies Awarded Phase 1 US Army Contract for Ultra-high Pressure Injection System for JP8

Green Car Congress

Alternative Fuel Technology, LLC has been awarded a Phase 1 SBIR contract (W56HZV-10-C-0200) from the US Army to concept design and demonstrate an ultra-high pressure, intensified fuel injection system for use with jet propellant (JP-8) fuel. With most fuel injection systems, JP-8 fuel causes wear and premature failure.

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New GM/Tula DSF cylinder deactivation technology could boost fuel efficiency in engines by up to 15%

Green Car Congress

The basic concept of Dynamic Skip Fire technology is to manage torque production in response to the driver command via selectively engaging or disengaging torque production from engine cylinders rather than by throttling. Wide authority over generation of vibrational and acoustic excitations. Wilcutts, M., Switkes, J., and Tripathi, A.

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Analysis: What’s the Best Way to Market EVs?

Clean Fleet Report

Ignoring the briefly popular commercial electrics around at the turn of the last century, EVs have been experimental concepts or limited edition runs until relatively recently. Without being exhaustive, let’s take a look at some examples. I’m looking primarily at the U.S. market; many other options await in Europe and Asia.

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LiquidPiston introduces latest X-series version of HEHC rotary engine; targeting 58% peak BTE, 2 hp/lb power density

Green Car Congress

Isuzu D201 35 hp diesel engine (left) and the LiquidPiston 40 hp X2 Prototype (right). Other features of the X2 include: Quiet operation: engine lacks poppet valves and over-expansion minimizes exhaust noise. Click to enlarge. LiquidPiston, Inc. Power modulation by cycle skipping increases efficiency and recaptures heat.

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U Mich study explores performance of renewable diesel, FT diesel and ULSD in PCCI combustion

Green Car Congress

Several other combustion modes are derived from the HCCI combustion concept: low temperature combustion (LTC), partially premixed charge compression ignition (PCCI), and reactivity-controlled compression ignition (RCCI) combustion modes. In the experiments, the researchers used a 425 cm 3 single-cylinder engine based on a GM/Isuzu 1.7

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