Method of selecting between two operating modes in a diesel-type dual fuel internal combustion engine and a diesel-type dual fuel internal combustion engine operable according to such a method

摘要

A method of selecting between two operation modes in a dual fuel internal combustion engine of the diesel-type is provided. The engine includes a combustion chamber at least partly delimited by a piston, a first fuel supply for a first fuel, the first fuel supply being located in or at the combustion chamber and/or in or at an inlet port thereof, and a second fuel supply for a second fuel. The engine has two different operation modes, both operation modes including the steps of pre-mixing the first fuel in the combustion chamber and/or in the inlet port, compressing the charge containing the first fuel to conditions that allow auto-ignition of the second fuel, performing a first injection of the second fuel into the combustion chamber to initiate auto-ignition of the second fuel, thereby initiating conditions for combustion of the fuel remaining in the combustion chamber after auto-ignition of the second fuel. The first operation mode is distinguished by homogeneous ignition and combustion of the remaining fuel. The second operation mode is distinguished by pre-mixed flame propagation combustion of the remaining fuel. The method includes adjusting the amount of the second fuel injected in the first injection of the second fuel, and/or the timing of the first injection of the second fuel, so as to control the combustion chamber temperature and pressure after auto-ignition of the second fuel such that selection between the first and second operation modes is achieved. A dual fuel internal combustion engine of the diesel-type is also provided.