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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.