Gaseous fuel mixer with exhaust gas recirculation

摘要

A mixing device for introducing gaseous fuel and recirculated exhaust gas into an intake passage of an engine, the mixing device including a body, an annular channel, the body defining a fuel inlet opening, and a plurality of gaseous fuel injectors fluidly coupled to the fuel inlet opening such that gaseous fuel from the plurality of gaseous fuel injectors is conveyed into the annular channel through the fuel inlet opening. The mixing device further includes a diffuser at a position of the annular channel to diffuse gaseous fuel from the annular channel into the intake airflow in the intake passage, an exhaust gas recirculation (EGR) inlet opening defined by the body and in fluid communication with the intake passage, and an exhaust gas recirculation supply pipe coupled to the EGR inlet opening and configured to direct recirculated exhaust gas from the engine into the intake passage.

主权项

1. A mixing device for introducing gaseous fuel and recirculated exhaust gas into an intake passage of an engine, the mixing device comprising: a body through which the intake passage extends for directing the intake airflow into the engine; an annular channel defined within the body to at least partially encircle the intake passage, the body defining a fuel inlet opening intersecting with a radially outer portion of the annular channel; a plurality of gaseous fuel injectors fluidly coupled to the fuel inlet opening such that gaseous fuel from the plurality of gaseous fuel injectors is conveyed into the annular channel through the fuel inlet opening; a diffuser positioned along the intake passage at a position of the annular channel to diffuse gaseous fuel from the annular channel into the intake airflow in the intake passage; an exhaust gas recirculation (EGR) inlet opening defined by the body and in fluid communication with the intake passage; and an exhaust gas recirculation supply pipe coupled to the EGR inlet opening and configured to direct recirculated exhaust gas from the engine into the intake passage through the EGR inlet opening, wherein the diffuser is part of a throttle body adapter coupled to the body at an upstream end of the mixing device, the throttle body adapter defining a radially inner wall of the first annular channel, and wherein the radially inner wall is provided with a plurality of radial diffuser apertures at a downstream end of the throttle body adapter, the downstream end abutting an inner shoulder surface of the body.