Engine Fuel Control For Internal Combustion Engine Having Dedicated EGR

摘要

A method of controlling the amount of fuel delivered to an engine having at least one dedicated EGR cylinder. The method is typically performed on an engine cycle-by-cycle basis. A fueling control unit receives, from the engine's main control unit, fueling requirement data representing a current fueling requirement suitable for the main cylinders. The fueling control unit then calculates a current amount of fuel to be delivered to the dedicated EGR cylinder as a function of the number of dedicated EGR cylinders, the number of main cylinders, the current equivalence ratio for the dedicated EGR cylinder, and the fueling requirement data. With the amounts of fuel for both the dedicated EGR cylinder and the main cylinders now having been determined, the fueling control unit generates appropriate control signals to the cylinder fuel delivery mechanisms.

主权项

1. A method of controlling the amount of fuel delivered to an engine, the engine having at least one dedicated EGR cylinder with the remaining cylinders being main cylinders, the engine further having an engine control unit:
receiving, from the engine control unit, fueling requirement data representing a current fueling requirement for the engine; calculating a current amount of fuel to be delivered to the at least one dedicated EGR cylinder and the main cylinders as a function of the number of dedicated EGR cylinders, the number of main cylinders, the current equivalence ratio for the dedicated EGR cylinder, and the engine fueling requirement data; delivering a first set of control signals representing the amount of fuel to be delivered to the at least one dedicated EGR cylinder; delivering a second set of control signals representing a current amount of fuel to be delivered to each of the main cylinders; and repeating the above steps during operation of the engine.