FUEL INJECTION CONTROL METHOD AND IGNITION TIMING CONTROL METHOD FOR LPG FUEL ENGINE

摘要

PPROBLEM TO BE SOLVED: To prevent deterioration in exhaust gas performance, lowing of power performance, and deterioration in fuel economy performance regardless of a composition ratio of LPG fuel. PSOLUTION: A liquid phase temperature and a gas phase pressure in an LPG cylinder 16 storing LPG fuel are detected by a temperature sensor 20 and a pressure sensor 22, respectively, and based on the detected temperature and pressure, a propane/butane rate of the LPG fuel is found. A calorific value or a octane number of the LPG fuel is found based on the found propane/butane ratio, and based on the found calorific value or octane number, a reference fuel injection amount or a reference ignition timing is corrected. PCOPYRIGHT: (C)2005,JPO&NCIPI