A method of controlling secondary fuelling in an internal combustion engine using engine exhaust measurement

摘要

A secondary fuelling system is connected electrically and hydraulically to improve the combustion efficiency and emissions of an internal combustion engine configured to be fuelled with a primary lower octane fuel and a controlled quantity of a secondary higher octane fuel. A method of supplying the secondary fuel includes the steps of measuring the peak exhaust pressure or the peak differential pressure of exhaust gases in the exhaust system for an engine cycle and using this information to calculate the peak exhaust pressure amplitude and timing and the fuel flow rate, determining the engine speed, measuring the secondary fuel gas pressure and temperature at the fuel inlet, computing a quantity of the secondary fuel and providing an injector signal to supply said calculated quantity of secondary fuel in the same engine cycle or the following engine cycle.