Pressurizing a gas injection type fuel injection system

摘要

PCT No. PCT/AU97/00438 Sec. 371 Date Mar. 8, 1999 Sec. 102(e) Date Mar. 8, 1999 PCT Filed Jul. 10, 1997 PCT Pub. No. WO98/01667 PCT Pub. Date Jan. 15, 1998Disclosed is a method of operating an internal combustion engine (20) with a fuel injection system (11;12) including an injector (12) for delivery of a fuel-gas mixture to a combustion chamber (60) of the engine (20). The engine (20) includes a gas supply system (11;13) pressurized at start-up through a pump-up sequence to a desired pressure for injection of fuel to the engine (20). In the pump-up sequence, the injector (12) is opened allowing pressurized gas to flow from the combustion chamber (60) through the injector (12) and into the gas supply system (11;13). This pressurizes the gas supply system (11;13) when pressure in the combustion chamber (60) is higher than the pressure in the gas supply system (11;13).