Diesel/Gasoline Dual Fuel Powered Combustion System based on Diesel Compression Ignition Triggered Ignition Control 2013-01-1718
The author's new approach, diesel and gasoline dual fuel powered combustion system based on diesel CI triggered ignition control, provides not only how key ideas extracted from LTC concept could be established in a small bore HSDI turbocharged diesel engine but also which mechanism works to bring almost same benefits as we have experienced in both conventional diesel combustion and LTC based advanced combustion systems like HCCI, PCCI and PPCI combustions.
The combustion system presented in the paper physically combines both mixing controlled diesel compression ignition combustion and gasoline premixed charge combustion in one power generation cycle. Gasoline fuel in the system is provided by the conventional gasoline PFI system firstly into the cylinder in which premixed charge spreads out. In compression stroke, the exact amount of diesel fuel is injected into the highly diluted EGR ambient with premixed gasoline charge. As a consequence, the mixing controlled diesel ignition is followed by gasoline flame propagation and it generates demand power in the expansion stroke.
Dual fuel powered combustion system has been implemented in 1.6 liter VGT diesel engine (Test Engine). And dual fuel powered combustion system has been successfully established in the test engine in terms of engine-out emissions and fuel consumption rate. PM and NOx emissions have been reduced by 97% and 70% respectively, compared to the baseline engine emission level. The baseline fuel consumption rate, however, is still there we usually see at the modern diesel engine system. Eventually it can be summarized that the physically combined diesel and gasoline combustion system has significant potential to bring advantages respectively from on both engine types. The paper reveals where the significant breakthrough comes from and what the key technology leading a good potential of the engine system is.