EGR venturi coupler
AssigneeBundy Corporation
InventorTimothy F. Rotarius
Life of this patent
Estimating the term…
Abstract
An engine exhaust gas recirculation system with a venturi with pressure taps on both sides for indicating and controlling the rate of flow of recirculated exhaust gas. Through an electronic control unit the pressure drop across the venturi is used to control the extent to which a recirculation valve is opened and hence control the flow rate of recirculated gas in response to engine operating conditions. Preferably, the venturi has a frusto-conical entrance and a cylindrical throat.
Claims15
An exhaust gas recirculation system for an internal combustion engine comprising:
- a conduit with an exhaust inlet and an exhaust outlet;
- a venturi located within said conduit through which exhaust gases flow;
- pressure taps located on each side of said venturi for indicating the pressure on each side thereof;
- a transducer connected to said pressure taps for sensing the pressure differential across said venturi and producing an electric output signal indicative thereof;
- a valve disposed in said conduit and operable to closed, open and partially open positions to control the rate of flow of exhaust gases through said conduit from said inlet through said outlet for recirculating the exhasut gases through an internal combustion engine;
- and
- an electronic control unit operably connected to said transducer for receiving the output signal thereform and to said valve for varying the extent to which said valve is open to control the rate of flow of recirculating exhaust gases in response to varying engine operating conditions, whereby said valve is controlled by said control unit as a function of the pressure differential across said venturi such that said valve controls recirculating exhasut gas flow through the engine.
A venturi coupler of an engine exhaust gas recirculation system comprising:
- a tubular coupler having ends adapted to be connected between an intake and an exhaust of an internal combustion engine for receiving exhasut gases flowing from the exhaust;
- a venturi within said coupler through which exhaust gases flow;
- said venturi comprising a body with an opening therethrough defined by a frost-conical entrance having an axial depth of about 0.020 to 0.055 of an inch and a cylindrical throat having an axial depth of at least 0.020 of an inch;
- and
- pressure taps on each side of said venturi for indicating pressure on each side of said venturi.
Dependencies are inferred from the claim text.