Control device of compression-ignition engine

摘要

A control device of a compression-ignition engine is provided. The control device includes the engine having a cylinder, an exhaust gas recirculation system for introducing exhaust gas into the cylinder, and a controller for operating the engine by compression-ignition combustion of mixture gas inside the cylinder within a predetermined compression-ignitable range on a low engine load side. Within the compression-ignitable range, the controller sets an EGR ratio higher as the engine load becomes lower, and the controller sets the EGR ratio to a predetermined highest EGR ratio when the engine load is at a specific load that is on the low engine load side within the compression-ignitable range. When the engine load is lower than the specific load, the controller sets the EGR ratio to be lower than the highest EGR ratio.

主权项

1. A control device of a compression-ignition engine, comprising:
an engine having a cylinder; an exhaust gas recirculation system for introducing exhaust gas into the cylinder; and a controller for operating the engine by compression-ignition combustion of mixture gas inside the cylinder when an operating state of the engine is within a predetermined compression-ignitable range on a low engine load side, wherein when the operating state of the engine is within the compression-ignitable range, the controller sets an EGR ratio higher as the engine load becomes lower, and the controller sets the EGR ratio to a predetermined highest EGR ratio when the engine load is at a specific load that is on the low engine load side within the compression-ignitable range, the EGR ratio being a ratio of the exhaust gas with respect to a total gas amount within the cylinder, and wherein when the engine load is lower than the specific load, the controller sets the EGR ratio to be lower than the highest EGR ratio.