| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel changeover control method for a bi-fuel engine capable of suppressing deterioration in exhaust gas performance, a lowering of power performance and worsening of fuel economy performance regardless of the composition ratio of LPG fuel. SOLUTION: A liquid phase temperature in an LPG cylinder 16 for storing LPG fuel is detected by a temperature sensor 20, and a gas phase pressure is detected by a pressure sensor 22. Based on the detected results, the propane/butane ratio of LPG fuel is obtained. The heating value or octane number of the LPG fuel is obtained from the obtained propane/butane ratio, and a fuel injection quantity or ignition timing is determined based on the heating value or octane number obtained when shifting to LPG operation. COPYRIGHT: (C)2005,JPO&NCIPI |
