Cylinder pressure based control of dual fuel engines

摘要

Systems and methods for controlling operation of dual fuel internal combustion engines in response to cylinder pressure based determinations are disclosed. The techniques control fuelling contributions from a first fuel source and a second fuel source to achieve desired operational outcomes in response to the cylinder pressure based determinations.

主权项

1. A method, comprising:
operating an internal combustion engine system including an intake system connected to an engine with a plurality of cylinders and at least two fuel sources operably connected to the internal combustion engine system to provide a flow of liquid fuel to each of the plurality of cylinders and a flow of a gaseous fuel to each of the plurality of cylinders, wherein the intake system is coupled to each of the plurality of cylinders to provide a charge flow from the intake system to a combustion chamber of the respective cylinder, the internal combustion engine system further including an exhaust system; determining a pressure in the combustion chamber of at least one cylinder during a combustion cycle associated with the cylinder; determining at least one operating condition of the at least one cylinder as a function of the pressure; determining a first part of the operating condition attributable to the liquid fuel; determining a second part of the operating condition attributable to the gaseous fuel, wherein the second part of the operating condition is determined from a difference between the operating condition in die at least one cylinder and the first part of the operating condition; and adjusting a substitution rate of the gaseous fuel for the liquid fuel in response to the operating condition deviating from a target operating condition.