System, apparatus, and method for controlling an engine system to account for varying fuel quality

A method of providing fuel reactivity compensation control for a dual fuel engine comprising:

• controlling, using control circuitry, pilot fuel quantity supplied to the dual fuel engine for operation of the dual fuel engine based on a generated pilot fuel offset signal;
• and
• controlling, using the control circuitry, air-to-fuel ratio (AFR) for the operation of the dual fuel engine based on a generated AFR control trim signal,
• wherein a NOx error value is used to generate one of the pilot fuel offset signal or the AFR control trim signal, and an exhaust temperature error value is used to generate the other of the pilot fuel offset signal or the AFR control trim signal,
• wherein the NOx error value is generated from a comparison of an actual NOx value from a NOx sensor and a desired NOx value produced from a first mapping operation based on engine speed and engine load as inputs, and
• wherein the exhaust temperature error value is generated from a comparison of an actual exhaust temperature value and a desired exhaust temperature value produced from a second mapping operation based on the engine speed and the engine load as inputs.

A non-transitory computer-readable storage medium having stored thereon instructions that, when executed by one or more processors, cause the one or more processors to perform an engine control method comprising:

• controlling pilot fuel quantity supplied to an engine based on a generated pilot fuel offset value;
• and
• controlling air-to-fuel ratio (AFR) for the engine based on a generated AFR control trim value,
• wherein a NOx error value is used to generate one of the pilot fuel offset value or the AFR control trim value, and an exhaust temperature error value is used to generate the other of the pilot fuel offset value or the AFR control trim value,
• wherein said controlling the pilot fuel quantity includes generating a pilot fuel quantity control value having the generated pilot fuel offset value as an addend, and
• wherein said controlling the AFR includes generating an AFR control value having the generated AFR control trim value as a multiplier.