초록 ▼

The present invention provides an apparatus for controlling air flow within an internal combustion engine comprising a secondary air passage. The secondary air passage system includes an air inlet channel directing air flow to the air assist valve and an air outlet channel directing air flow from th

The present invention provides an apparatus for controlling air flow within an internal combustion engine comprising a secondary air passage. The secondary air passage system includes an air inlet channel directing air flow to the air assist valve and an air outlet channel directing air flow from the air assist valve. The air outlet channel communicates with a plurality of fuel injector tips which are disposed within the engine. An air bypass circuit is interposed between the air inlet channel and the air outlet channel to provide an alternate air channel which is independent of the air assist valve. An engine controller electronically communicates with the air assist valve for causing the air assist valve to vary between its open and closed modes.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for controlling air flow in an internal combustion engine comprising:a primary air passage including a throttle valve for controlling a volume of air passing therethrough and an idle air duct bypassing said throttle valve;an idle air pintle disposed in said i

[ What is claimed is:] [1.] An apparatus for controlling air flow in an internal combustion engine comprising:a primary air passage including a throttle valve for controlling a volume of air passing therethrough and an idle air duct bypassing said throttle valve;an idle air pintle disposed in said idle air duct for controlling a volume of air passing therethrough;a secondary air passage for directing assist air to at least one fuel injector tip;an air assist valve variable between an open mode and a closed mode disposed on said secondary air passage;an air bypass circuit coupled at a first end upstream of said air assist valve and coupled at a second end downstream of said air assist valve for providing an alternate air channel independent of said air assist valve; andan engine controller electronically communicating with said air assist valve for varying said air assist valve between said open mode and said closed mode, said variation to said open mode including ramping up a pulse width modulated signal sent to said air assist valve by a calibrated percentage of duty cycle as a function of a predetermined amount of time to controllably move said air assist valve from said closed mode to said open mode and ramping out a position of said idle air pintle a preselected number of position steps of offset over a second predetermined amount of time to compensate for an additional volume of air passing through said secondary air passage, and said variation to said closed mode including ramping out said pulse width modulated signal sent to said air assist valve by a second calibrated percentage of duty cycle as a function of a third predetermined amount of time to controllably move said air assist valve from said open mode to said closed mode and ramping in said position of said idle air pintle a second preselected number of position steps of offset over a fourth predetermined amount of time to compensate for a reduced volume of air passing through said secondary air passage.