Internal combustion engine

An internal combustion engine comprising a fuel injection valve which has a needle and which injects fuel into a cylinder of the internal combustion engine when the valve having the needle is opened, the internal combustion engine further comprising:

• an electronic control unit comprising at least one processor,
• wherein, when a requested injection amount of the fuel to be injected by a post injection is larger than an injection amount threshold value, and when the post injection is carried out after a main injection of the fuel to be injected from the fuel injection valve, the at least one processor is configured to:
• raise a valve opening speed of the needle during the post injection as compared with a valve opening speed of the needle during the main injection if a pressure of the fuel is not more than a first predetermined pressure;
• and
• lower the valve opening speed of the needle during the post injection as compared with the valve opening speed of the needle during the main injection if the pressure of the fuel is not less than a second predetermined pressure that is a pressure larger than the first predetermined pressure.