Knocking control method and knocking control device for direct-injection spark ignition internal combustion engine

Abstract

To effectively suppress knocking which is large in a cycle variation in a high-speed high-load area.SOLUTION: In a high-speed knock region, a first pressure P1 being a lower limit of an exhaust-valve opening-timing in-cylinder pressure, and a second pressure P2 being an upper limit are set on the basis of an engine drive condition (S12), and reference ignition timing ADV0 at which a trace knock state may arise and fuel injection timing INJ0 are set (S13). When a detected exhaust-valve opening-timing in-cylinder pressure Pevo is lower than the first pressure P1, succeeding cycle ignition timing ADV and fuel injection timing INJ are retardation-corrected (S16). When the exhaust-valve opening-timing in-cylinder pressure Pevo is higher than the second pressure P2, the succeeding cycle ignition timing ADV is advance-corrected (S17). When the exhaust-valve opening-timing in-cylinder pressure Pevo is set between the first pressure P1 and the second pressure P2, succeeding cycle combustion is performed by using the reference ignition timing ADV0 and the fuel injection timing INJ0 (S18).SELECTED DRAWING: Figure 3