Common rail system with leak containment and detection

摘要

This disclosure provides a fuel system for supplying fuel to an internal combustion engine, an internal combustion engine that includes such a fuel system, a connector for connecting a single-walled high pressure common rail to a double-walled fuel line segment, and a fluid containment system. Each embodiment includes drain plumbing having a leakage drain connector that can be used to provide an interface between a single-walled high pressure common rail and a double-walled high pressure fuel line segment, and also provide part of a low pressure passage fluidly connected with a low pressure passage of the double-walled high pressure fuel line segment. The drain plumbing also can provide an interface with a low pressure fuel drain line fluidly coupled to a leakage detector.

主权项

1. A fuel system for supplying fuel to an internal combustion engine, comprising:
a single-walled high pressure common rail including a main body and plural members extending from the main body, each member having a high pressure passage leading to the main body; plural double-walled fuel line segments adapted to fluidly connect the high pressure passages of the single-walled high pressure common rail to respective plural fuel injectors, each said segment including a high pressure fuel line, a jacket surrounding the high pressure fuel line, a low pressure passage between the high pressure fuel line and the jacket, and a fuel line connector housing a portion of the high pressure fuel line such that an end portion of the high pressure fuel line protrudes from a first end of the fuel line connector and a second end of the fuel line connector is sealingly connected to the jacket to thereby extend the low pressure passage into the fuel line connector; plural leakage drain connectors coupled to an outer surface of the fuel line connector, each said leakage drain connector sealingly connected at a first end portion thereof to one of the members and sealingly connected at a second end portion thereof to one of the plural fuel line connectors, such that the protruding end portion of the high pressure fuel line sealingly engages with the high pressure passage of the member and the low pressure passage of the fuel line connector extends through the leakage drain connector to an opening at an outer surface of the leakage drain connector; and a fuel drain line fluidly coupled to each of said openings of the plural leakage drain connectors.