This article is an overview of a φ (equivalence ratio) -T (temperature) map and its applications for studying engine combustion concepts. The φ-T map gives visual image of in-cylinder condition of engine combustion and is utilized to study various engine combustion concepts in the last ten years. In the first part, the background and calculation method of the map are described. In addition, 6 combustion regions, namely, CDC (Conventional Diesel Combustion), LTC (Low Temperature Combustion),

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... (Homogeneous Charge Compression Ignition), SLRC (Smokeless Rich Combustion) , SI (Spark Ignition) and DP (Desirable Path) are defined on the map. In the second part, several combustion concepts and those combustion regions on the map are discussed to show the point of contact between the φ-T map and engine combustion concepts.