PRESSURE REGULATION DEVICE

摘要

PROBLEM TO BE SOLVED: To make better engine operation by causing an easily vaporizing liquid fuel such as LPG to be stably injected in liquid state from an injection valve even at high temperatures. SOLUTION: A back pressure chamber 16 of a pressure regulator 11 provided in a return duct 5 leading to a fuel tank 1 after branching off a supply duct 3 leading from a fuel pump 2 to the injection valve 4 is connected to the side of a fuel tank 1 by a back pressure passage 25 to introduce the liquid fuel. With the liquid fuel sealed in by means of a check valve 26, the pressure of the liquid fuel flowing in a pressure control chamber 15 is regulated while vapor pressure matching the ambient temperature is used as a reference. By setting the pressure to suit temperature near the injection valve 4, the fuel is injected without being vaporized. Pressures equal to or higher than a certain level are released from a high pressure relief valve 27 for safety. COPYRIGHT: (C)2004,JPO