FUEL SUPPLY CONTROL APPARATUS FOR BI FUEL INTERNAL COMBUSTION ENGINE AND METHOD OF SWITCHING FUEL IN BI FUEL INTERNAL COMBUSTION ENGINE

摘要

When switching the fuel used for engine operation from gasoline to CNG CNG is supplied experimentally to a cylinder of interest with the other cylinders supplied with gasoline and it is determined whether CNG was supplied to the cylinder of interest on the basis of the amount of change (Pc) of fuel pressure in a CNG delivery pipe (step S13 to step S16). When it is determined that all of the cylinders were supplied with the gaseous fuel (step S19: YES) the fuel used for engine operation is switched from the liquid fuel to the gaseous fuel (step S20).