METHOD FOR CORRECTING IGNITION ADVANCE OF AN INTERNAL COMBUSTION ENGINE

摘要

The invention concerns a method for correcting ignition advance of an internal combustion engine based on the variation of the natural gas composition contained in a tank and feeding said engine. It consists in determining a methane index with respect to the natural gas filling said tank and deducting therefrom a value for correcting ignition advance. The invention is characterised in that a correlation has been established between said methane index, a ratio air flow/fuel flow rate R for a stoichiometric combustion and the variation in the gas flow rate required to obtain a reference operational point of the engine following the variation in the composition of said gas.