APPARATUS AND METHOD FOR CALCULATING SUBSTITUTIVE FUEL PRESSUE OF BI FUEL CAR

摘要

PURPOSE: A device and a method for calculating a value substituting a fuel pressure of a LPI vehicle are provided to accurately control an engine under the failure of a fuel pressure sensor since a value substituting a fuel pressure is calculated based on a fuel temperature or an inflow air temperature. CONSTITUTION: A method for calculating a value substituting a fuel pressure of a LPI vehicle comprises the next steps. If it is determined that a fuel pressure sensor is out of order(103) after diagnosing the fuel pressure sensor(101), a controller calculates a first fuel pressure of a fuel supply line from a fuel pressure modeling value for a fuel temperature and a fuel component ratio supplied from a fuel temperature sensor(109). A value substituting a fuel pressure is calculated by correcting the first fuel pressure based on a second fuel pressure and a threshold value of a fuel pressure regulator(111). The engine is controlled with the value substituting a fuel pressure(113).