METHOD FOR OPERATING A COMPRESSION IGNITION ENGINE

摘要

A method for operating a compression ignition engine includes forming a combustible mixture by mixing generally homogeneously a first fuel and air and introducing this mixture into the at least one cylinder, compressing the combustible mixture with the piston in a compression stroke, injecting a second fuel to the combustible mixture at an injection-time of the second fuel during the compression stroke but before start of combustion, and continuing the compression stroke until combustion starts at those locations in the at least one cylinder where concentration of the second fuel is highest and/or the temperature of the mixture is the highest. Emission of the cylinder and/or mechanical stress of the cylinder caused by the combustion are monitored, and if emissions and/or mechanical stress are above respective predetermined thresholds, individually for the cylinder, the amount and/or the timing of the second fuel injected, and/or temperature of the cylinder charge is changed.

主权项

1. A method for operating a compression ignition engine, the engine having at least one cylinder and a piston movable in the at least one cylinder and the method comprising the steps of:
forming a combustible mixture by mixing generally homogeneously a first fuel and air and introducing this mixture into the at least one cylinder compressing the combustible mixture with the piston in a compression stroke injecting a second fuel to the combustible mixture at an injection-time of the second fuel during the compression stroke but before start of combustion thus creating a cylinder charge, the second fuel being easier to autoignite compared to the first fuel, continuing the compression stroke until combustion starts at those locations in the at least one cylinder where concentration of the second fuel is highest and/or the temperature of the mixture is the highest,characterized in that emission of the at least one cylinder and/or mechanical stress of the at least one cylinder caused by the combustion are being monitored and if emissions and/or mechanical stress are above respective predetermined thresholds, individually for the at least one cylinder, change
the amount and/or the timing of the second fuel injected, and/or temperature of the cylinder chargesuch that emissions and/or mechanical stress go down below their respective predetermined thresholds.