Engine control system having fuel-based timing

A method of operating an engine, comprising:

• sensing with a pressure sensor a peak cylinder pressure during a power stroke of an engine associated with a generator;
• equating the sensed peak cylinder pressure to an amount of an air/fuel mixture remaining within the cylinder;
• comparing the amount with a desired amount;
• and
• selectively adjusting a valve timing of the engine associated with a subsequent combustion event based on the comparison.

A genset, comprising:

• a generator configured to generate an electrical output;
• an engine having:
• a cylinder;
• an engine valve movable to regulate a fluid flow of the cylinder;
• an actuator associated with the engine valve;
• a crankshaft driven by combustion within the cylinder to mechanically rotate the generator;
• a pressure sensor configured to sense a peak cylinder pressure;
• and
• a controller in communication with the actuator and the sensor, the controller being configured to:
• equate the sensed peak cylinder pressure to an amount of an air/fuel mixture remaining within the cylinder;
• compare the amount with a desired amount;
• and
• selectively regulate the actuator to adjust a timing of the engine valve associated with a subsequent combustion event based on the comparison.