Patent ID: 7441541

Claim:
An internal combustion engine system including an internal combustion engine that has multiple cylinders and is capable of receiving fuel injection in an intake system in each of the multiple cylinders, said internal combustion engine system comprising: a fuel injection unit that is capable of individually injecting a fuel into the intake system in each of the multiple cylinders of the internal combustion engine; a rotation speed measurement unit that measures a rotation speed of the internal combustion engine; an engine stop-time fuel injection control module that, in response to a preset operation stop command of the internal combustion engine, controls the fuel injection unit to make fuel injection in a cylinder that stops in a predetermined range including part of a compression stroke in an operation stop of the internal combustion engine, the control of the fuel injection unit by said engine stop-time fuel injection control module prohibiting fuel injection until the measured rotation speed of the internal combustion engine is lowered to a preset start rotation speed, allowing fuel injection while the measured rotation speed of the internal combustion engine is between the preset start rotation speed and a preset stop rotation speed, and prohibiting fuel injection again after the measured rotation speed of the internal combustion engine is lowered to the preset stop rotation speed; a rotation stop position detection unit that detects a rotation stop position of a crankshaft of the internal combustion engine in the operation stop of the internal combustion engine; and a start rotation speed/stop rotation speed regulation module that regulates at least one of the start rotation speed and the stop rotation speed, based on the detected rotation stop position and a state of fuel injection in the cylinder stopping in the predetermined range.