Patent ID: 7140354
Filing Date: 2006-11-28
Classification: F02D,F02M,Y02T

Abstract:
1. A compressed gaseous fuel system for an internal combustion engine, comprising: an electronic engine controller; a common fuel rail; a plurality of fuel injectors operatively connected with said common-rail and with said engine controller; a high pressure gaseous fuel source; an upstream pressure regulator, connected with the high pressure fuel source, for reducing the source pressure to a first working pressure; a downstream pressure regulator, connected with an outlet of the upstream pressure regulator, for reducing the first working pressure to a second working pressure; a control regulator, operatively connected with the downstream pressure regulator, for reducing the second working pressure to a variable control pressure commanded by said engine controller, and for furnishing fuel at the control pressure to said common fuel rail; and a fuel pump, operatively connected with said control regulator and said engine controller, for selectively transferring fuel from the fuel rail to a portion of said fuel system located upstream from said downstream pressure regulator.