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GM R&D study explores effect of temperature and O2 concentration on automotive low-load HCCI

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A study by a team at the Propulsion Systems Research Labs, GM R&D has concluded that the combustion instability of homogeneous charge compression ignition (HCCI) at the low-load range is caused by lack of oxygen concentration rather than lower in-cylinder mixture temperature. Earlier post.). 5 512-524 doi: 10.1177/1468087412463304.

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GM details 2016 Chevrolet Malibu Hybrid powertrain design and operation

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At the 2016 SAE World Congress, GM engineers presented a paper describing the development of the new hybrid powertrain for the popular mid-size sedan. The new engine is fitted with an exhaust gas heat recovery (EGHR) system. The exhaust gas heat recovery unit is attached at the outlet side of the catalytic converter.

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GM Ventures portfolio company SDCmaterials secures 1st supply agreement for cost-saving advanced catalyst products for autos

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The automotive catalytic converter, developed in the early 1970s primarily by General Motors and BASF/Engelhard and first deployed in 1975, changes exhaust pollutants into CO 2 , water vapor and nitrogen. —Jon Lauckner, GM CTO and president of GM Ventures. Enhanced precious metal resource and environmental stewardship.

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GM RD Develops and Demonstrates Strontium-Doped Perovskite Catalysts Rivaling Platinum Catalysts for NOx Control in Diesel Exhaust; Lower Cost Could Be a Boost for Diesel

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Because NO 2 constitutes less than 10% of NO x in the diesel engine-out exhaust, an oxidation catalyst is required to increase the NO 2 fraction. Platinum has been found to be especially active for NO oxidation; thus, Pt-based diesel oxidation (DOC) and LNT catalysts have been widely used for diesel exhaust aftertreatment. Science Vol.

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32.5M hours of supercomputer time to aid GM, Ford engine projects with Oak Ridge Lab

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Graphic from GM, Edwards AMR 2014 presentation. The umbrella projects addresses specific technology barriers identified by DOE and industry stakeholders; Ford and GM had expressed interest in working with Oak Ridge in these areas, and GE came later and was worked in under the same project, notes Edwards. Resources.

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

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GM is working closely with Tula Technology, a Silicon Valley-based supplier of Dynamic Skip Fire (DSF)—a software-enabled powertrain technology that integrates advanced digital signal processing with advanced powertrain controls to create a variable displacement engine. Wilcutts et al. Click to enlarge. Wilcutts, M., Switkes, J.,

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CNG Process for GM Full-Size Vans Nears Completion; PCI Providing the Fuel System

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The CNG vehicle uses GM’s Vortec 6.0L V8 engine, modified with hardened exhaust valves, and intake and exhaust valve seats for improved wear resistance and durability with gaseous fuel systems. These hardened engines will be assembled into the Chevrolet Express and GMC Savana vans at GM’s Wentzville, Mo.

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