Automatic stop / restart device for an internal combustion engine and automatic stop / restart method for an internal combustion engine

摘要

An automatic stop / restart apparatus for an internal combustion engine for performing automatic stop operation for the internal combustion engine when a predetermined automatic stop condition is satisfied during operation of the internal combustion engine, and performing a restart operation for the internal combustion engine when a predetermined restart condition during a automatic stop time period of the internal combustion engine is satisfied, wherein the automatic stop / restart device comprises: a crank angle detecting means for detecting a crank angle of the engine; a rotational speed calculating means for calculating a rotational speed of the internal combustion engine in accordance with the crank angle detecting means; a synchronous fuel injection device for injecting a fuel in synchronism with a predetermined crank angle during operation of the internal combustion engine; a starting device for cranking the internal combustion engine at a time of starting and restarting the internal combustion engine; and a restart control means for performing a restart operation for the internal combustion engine by controlling the starting device while the rotational speed decreases during the automatic stopping time period of the internal combustion engine by inertia or after a stop, wherein the restart control means comprises: an initial asynchronous injection processing section for determining whether or not an initial asynchronous injection of the fuel into a cylinder which is in an intake stroke is executable in accordance with an initially detected crank angle after a start of the restart operation; and a next injection determination processing section for determining a cylinder that is in transition from an exhaust stroke to the intake stroke after the initially detected crank angle as a next injection cylinder, and determining an injection timing for the next injection cylinder, and wherein the restart control means performs fuel injection control at the time of start of the restart operation in accordance with a result of determination by the initial asynchronous injection processing section and a result of determination by the next injection determination processing section.