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05 04 2017 04

Delphi projects that engines employing its coming third-generation gasoline direct-injection compression-ignition (GDCI) combustion system will attain a thermal efficiency of 42%, the company said at the 2017 SAE High-Efficiency IC Engines Symposium in Detroit. That thermal efficiency would top any current production-vehicle gasoline engine, the most efficient of which are claimed to have peak thermal efficiency of about 40%.

Mark Sellnau, engineering manager, Delphi Advanced Powertrain, said a gasoline engine using the third-generation GDCI system now under development is projected to have approximately 22% better thermal efficiency than a current conventional spark-ignited gasoline engine with direct fuel injection and 11% better than a 2L diesel engine. He said many of the initial engineering challenges for GDCI have been overcome and that the company believes it can make the low-temperature combustion system emissions-compliant at the EPA Tier 3, bin 30 level.

Major advances over Delphi’s second-generation GDCI system include “wetless” combustion, quicker cold-start operation and an optimized low-temperature exhaust aftertreatment that achieves roughly 90% carbon monoxide conversion in about 4s.

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