METHOD AND SYSTEM FOR IMPROVING CHANGING FUEL IN BI-FUEL CAR

摘要

Introduced is a fuel change improvement method of a bi-fuel car. For the same, the fuel change improvement method of the present invention includes: a step of measuring an LPG level in an LPG fuel tank, and continuing car driving with the LPG fuel if the LPG level is smaller than a first reference value established; a pressure reference driving step of continuing car driving with the LPG fuel if an LPG rail pressure and a pressure in the LPG fuel tank are compared with an established reference value and it is judged that it is possible to continue car driving with the LPG fuel; a pressure change rate reference driving step of continuing car driving with the LPG fuel if the amount of the LPG rail pressure changed and the amount of the pressure changed in the LPG fuel tank are compared with an established reference value and it is judged that it is possible to continue car driving with the LPG fuel; and a fuel expansion step of continuing car driving with the LPG fuel if the amount of the LPG fuel injected and an accumulation value of mileage are compared with an established reference value and it is judged that it is possible to continue car driving with the LPG fuel. The fuel change improvement method of the present invention is to use a cheap LPG maximally.