Pressure control valve for gaseous fuel

摘要

A pressure control valve controls a pressure of a gaseous fuel according to an engine operation state. The pressure control valve has a movable valve body, a manifold chamber that communicates with an intake manifold, and a passage that is connected to an injector. An intake manifold pressure from the manifold chamber moves the movable valve body in a valve opening direction and an output pressure from the passage moves the movable valve body in a valve closing direction. In such manner, the pressure control valve changes a magnitude of a differential pressure between the output pressure and the intake manifold pressure according to a magnitude of the intake manifold pressure.

主权项

1. A pressure control valve for a gaseous fuel supply system with a fuel tank for storing a gaseous fuel and an injector for injecting the gaseous fuel into an intake manifold that is connected to an internal-combustion engine, the pressure control valve comprising:
a housing having an inlet port and an outlet port, the inlet port through which the gaseous fuel is provided from the fuel tank and the outlet port through which pressure-controlled gaseous fuel is provided to the injector; a first pressure receiver receiving a pressure provided to the injector; a second pressure receiver receiving an intake manifold pressure; a movable valve body that is positioned between the inlet port and the outlet port and biased by a first received force received by the first pressure receiver and a second received force received by the second pressure receiver; and a seat member that selectively abuts the movable valve body to open and close communication between the inlet port and the outlet port, wherein the movable valve body changes a differential pressure between the pressure provided to the injector and the intake manifold pressure.