Gaseous fuel supply system fuel communication control method, gaseous fuel supply system fuel leakage detection method and apparatus

摘要

PPROBLEM TO BE SOLVED: To secure independence of a gaseous fuel supply system when needed, to allow movement of gaseous fuel between the gaseous fuel supply systems as needed, and to prevent erroneous detection of fuel leakage, in an internal combustion engine in which each gaseous fuel supply system is independently disposed for each cylinder group. PSOLUTION: A communicating pipe cutoff valve is disposed to a communicating pipe connecting between gaseous fuel supply systems, and is driven to be opened/closed by an ECU. With a state where the communicating pipe cutoff valve is closed, gaseous fuel supply systems are independent from each other. At that time, since the gaseous fuel supply system from which fuel leaks is identified by fuel leakage detection process, the fuel leakage is dealt with appropriately. Further, when one of vessel main valves are in closing malfunction state ('YES' at S104), the communication pipe cutoff valve is in an open state (S110). Since CNG is moved between the gaseous fuel supply systems, operation of the engine by all cylinders is kept. Thereby, the problem is solved. PCOPYRIGHT: (C)2003,JPO