INTERNAL COMBUSTION ENGINE SYSTEM

An internal combustion engine system includes an internal combustion engine including an in-cylinder injection valve and a fuel pressure adjustment mechanism, and a control device that executes fuel injection control at a time of automatic restart of the internal combustion engine that is automatically stopped, by controlling the in-cylinder injection valve and the fuel pressure adjustment mechanism, in which the control device includes a first controller that executes the compression stroke injection a first number of times after an automatic restart request is made and control the pressure of the fuel to a predetermined value, and a second controller that executes the intake stroke injection a second number of times after the compression stroke injection is executed the first number of times and make the pressure of the fuel lower than the predetermined value.