Use of Exhaust Valve Timing Advance for High Natural Gas Utilization in Low-Load Diesel Dual Fuel Operation

Thananchai Tepimonrat; Kittisak Kamsinla; Ekathai Wirojsakunchai; Tanet Aroonsrisopon; Krisada Wannatong

doi:10.4271/2011-01-1767

The current study examined diesel dual fuel (DDF) operations in a four-cylinder turbocharged diesel engine under low load conditions. Experiments were performed to investigate effects of diesel injection timings and exhaust valve timing advance for DDF operations under high levels of natural gas utilization.

Results showed that diesel injection timings played an important role in DDF combustion. Increasing the ratio of natural gas to total fuel resulted in greater amounts of HC and CO emissions. Advancing the exhaust valve timing increased the internal EGR, raised the in-cylinder temperature at IVC, and improved the combustion efficiency. To maximize the ratio of natural gas to total fuel, a combination of proper exhaust valve timing advance and a tuned timing of diesel injection should be employed to avoid excessive HC and CO emissions.

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Use of Exhaust Valve Timing Advance for High Natural Gas Utilization in Low-Load Diesel Dual Fuel Operation 2011-01-1767

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