Control device of compression-ignition engine

A control device of a compression-ignition engine, comprising:

• an engine having a cylinder;
• a fuel injection valve for injecting a fuel to be supplied into the cylinder;
• an exhaust valve mechanism for switching an operation mode of an exhaust valve of the engine between a normal mode in which the exhaust valve is opened on exhaust stroke, and an open-twice mode in which the exhaust valve is opened on the exhaust stroke and intake stroke to introduce a part of exhaust gas into the cylinder;
• a throttle valve disposed on an intake passage connecting with the cylinder;
• and
• a controller for operating the engine by compression-ignition combustion of mixture gas inside the cylinder at least when an operating state of the engine is within a low engine load range,
• wherein the controller suspends the fuel injection by the fuel injection valve when a predetermined fuel cut condition is met while the engine decelerates, and the controller fully closes the throttle valve and controls the exhaust valve mechanism to operate in the open-twice mode during the fuel cut, and
• wherein when a predetermined fuel resuming condition is met, the controller restarts the fuel injection by the fuel injection valve, opens the throttle valve, and causes the compression-ignition combustion of the mixture gas inside the cylinder.