Sensing the mass flow of gas and air to an internal combustion engine

摘要

A gas mass flow sensor for sensing the flow of a gas to an internal combustion engine including a main flow passage (152) having an inlet (150) and an outlet for directing a gas flow to the internal combustion engine. A secondary flow passage for isolating a portion of the gas flow from the main flow passage (152) is provided with the secondary flow passage including an annular inlet surrounding the main flow passage (152) and a flow sensing section containing a gas mass flow sensor for sensing the mass flow of gas through the secondary passage which is indicative of the mass flow through the main flow passage (152). Positioned within the main flow passage (152) is a nozzle (154) wherein the outer diameter of the nozzle inlet is less than an inner diameter of the main flow passage (152). The mass flow sensor is incorporated into a unitary mass flow sensing and mixing module (102) for sensing a flow of both air and fuel as well as for mixing the air and fuel together for delivery to an internal combustion engine.