Fuel type detection for internal combustion engine

A method for controlling an internal combustion engine that is capable of use with a primary fuel and a pilot fuel, the method comprising:

• generating commands that cause a fuel injector to inject the primary fuel for combustion in the internal combustion engine;
• receiving signals from a sensor, the signals indicating pressure according to combustion of the primary fuel within the internal combustion engine;
• determining whether the primary fuel corresponds to a first fuel or to a second fuel based on the signals from the sensor;
• and
• generating adjusted fuel injector commands based on whether the primary fuel was determined to correspond to the first fuel or to the second fuel.

A system for controlling an internal combustion engine, the system comprising:

• an internal combustion engine configured for use with different fuel types;
• a fuel injector configured to inject fuel;
• an in-cylinder pressure sensor connected to the internal combustion engine;
• and
• an electronic control module configured to:
• receive signals from the in-cylinder pressure sensor,
• generate commands to cause current to be supplied to the fuel injector for a duration, the current causing the fuel injector to inject the fuel, and
• determine the duration based on the signals from the in-cylinder pressure sensor.