Device and method for controlling start of compression self-ignition engine

A start control device, comprising:

• a compression self-ignition engine;
• a fuel injection valve for injecting fuel into a cylinder;
• a piston stop position detector for detecting a stop position of a piston;
• a starter motor for applying a rotational force to the engine, the engine combusting through a self-ignition, the fuel injected into the cylinder by the fuel injection valve;
• and
• a controller for automatically stopping the engine when a predetermined automatic stop condition is satisfied, and thereafter, when a predetermined restart condition is satisfied and the stop position of the piston of a compression-stroke-in-stop cylinder that is on a compression stroke while the engine is stopped is within a reference stop position range set relatively on a bottom dead center side, restarting the engine by injecting the fuel into the compression-stroke-in-stop cylinder while applying the rotational force to the engine by using the starter motor,
• wherein in restarting the engine, when the restart condition is determined to be not based on a request from a driver, even when the stop position of the piston of the compression-stroke-in-stop cylinder is within the reference stop position range, the controller restarts the engine by injecting the fuel into an intake-stroke-in-stop cylinder that is on intake stroke while the engine is stopped, when the cylinder reaches the compression stroke, and on the other hand, when the restart condition is determined to be based on the request from the driver, the controller restarts the engine by injecting the fuel into the compression-stroke-in-stop cylinder.