| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for a compression-ignition internal combustion engine, which does not cause upsizing, and which enhances exhaust emission performance by properly controlling switching between a spark-ignition operation and a compression-ignition operation while having a simple configuration.SOLUTION: The control device for the compression-ignition internal combustion engine switches an operation of the compression-ignition internal combustion engine (engine) between the compression-ignition operation of bringing about premixed compression-ignition combustion of an air-fuel mixture supplied to a combustion chamber and the spark-ignition operation of bringing about spark-ignition combustion of the air-fuel mixture via a spark plug of the combustion chamber. The control device detects a temperature Tc of a catalyst for exhaust emission control, which is arranged in an exhaust system of the engine (S12 and S20), performs switching from the compression-ignition operation to the spark-ignition operation when the catalyst temperature Tc detected during the compression-ignition operation of the engine is lower than a first predetermined value Tc1 (S14 and S18), and performs switching from the spark-ignition operation to the compression-ignition operation when the catalyst temperature Tc detected during the spark-ignition operation of the engine is higher than a second predetermined value Tc2 (S22 and S26). |
