Gas mixture feed system for internal combustion engine

A gas mixture feed system for an internal combustion engine wherein said gas mixture feed system comprises:

• a carburetor including an intake passageway, a throttle valve provided in said intake passageway, a movable air valve in the intake passageway upstream of said throttle valve, and a fuel metering device connecting a fuel supply source to said intake passageway and controlled by said air valve;
• intake passageway means communicating the outlet of said intake passageway of the carburetor with the internal combustion engine;
• and
• an exhaust gas recirculating device for recirculating the exhaust gas from said internal combustion engine to the intake passageway, said exhaust gas recirculating device having an outlet opening disposed in a wall surface of said intake passageway between said air valve and said throttle valve,
• wherein said air valve is a movable vane operatively associated with the throttle valve, the outlet opening of said exhaust gas recirculating device is at a portion of said wall surface of said intake passageway, said portion confronting the rear surface of said vane, and guide means is provided in the vicinity of the outlet opening of said exhaust gas recirculating device such that part of the exhaust gas recirculated is caused to impinge on said vane and another part of the exhaust gas recirculated is caused to flow along said wall surface around said outlet opening.

A gas mixture feed system for an internal combustion engine wherein said gas mixture feed system comprises:

• a carburetor including an intake passageway, a throttle valve provided in said intake passageway, a movable air valve in the intake passageway upstream of said throttle valve, and a fuel metering device connecting a fuel supply source to said intake passageway and controlled by said air valve;
• intake passageway means communicating the outlet of said intake passageway of the carburetor with the internal combustion engine;
• and
• an exhaust gas recirculating device for recirculating the exhaust gas from said internal combustion engine to the intake passageway, said exhaust gas recirculating device having an outlet opening disposed in a wall surface of said intake passageway between said air valve and said throttle valve,
• wherein said air valve is a movable vane operatively associated with the throttle valve, the outlet opening of said exhaust gas recirculating device is at a portion of said wall surface of said intake passageway, said portion confronting the rear surface of said vane, and said exhaust gas recirculating means comprises:
• an exhaust gas passageway formed in the main body of the carburetor;
• a plunger movable so as to transverse said exhaust gas passageway and formed therein with a through-hole;
• and
• means for operatively connecting said plunger to said movable vane such that said plunger is movable in accordance with the movement of said movable vane so as to vary the opening area defined by said exhaust gas passageway and said through-hole.

A gas mixture feed system for an internal combustion engine wherein said gas mixture feed system comprises:

• a carburetor including an intake passageway, a throttle valve provided in said intake passageway, a movable air valve in the intake passageway upstream of said throttle valve, and a fuel metering device connecting a fuel supply source to said intake passageway and controlled by said air valve;
• intake passageway means communicating the outlet of said intake passageway of the carburetor with the internal combustion engine;
• and
• an exhaust gas recirculating device for recirculating the exhaust gas from said internal combustion engine to the intake passageway, said exhaust gas recirculating device having an outlet opening disposed in a wall surface of said intake passageway between said air valve and said throttle valve,
• wherein said air valve is a movable vane operatively associated with the throttle valve, the outlet opening of said exhaust gas recirculating device is at a portion of said wall surface of said intake passageway, said portion confronting the rear surface of said vane, and said exhaust gas recirculating means is provided with a control valve and means for varying the opening of said control valve in accordance with the movement of said movable vane;
• and further wherein the fuel metering means of said carburetor further comprises:
• an air bleeder;
• a regulating valve for opening and closing said air bleeder;
• and
• means for controlling said regulating valve so as to open said air bleeder at the time when said control valve of the exhaust gas recirculating means is closed.

A gas mixture feed system for an internal combustion engine wherein said gas mixture feed system comprises:

• a carburetor including an intake passageway, a throttle valve provided in said intake passageway, a movable air valve in the intake passageway upstream of said throttle valve, and a full metering device connecting a fuel supply source to said intake passageway and controlled by said air valve;
• intake passageway means communicating the outlet of said intake passageway of the carburetor with the internal combustion engine;
• and
• an exhaust gas recirculating device for recirculating the exhaust gas from said internal combustion engine to the intake passageway, said exhaust gas recirculating device having an outlet opening disposed in a wall surface of said intake passagewy between said air valve and said throttle valve,
• wherein said air valve is a movable vane operatively associated with the throttle valve, the outlet opening of said exhaust gas recirculating device is at portion of said wall surface of said intake passageway, said portion confronting the rear surface of said vane, and said exhaust gas recirculating means is provided with a control valve and means for varying the opening of said control valve in accordance with the movement of said movable vane;
• and further comprising air feed means for feeding air to the portion of said intake passageway between said movable vane and the throttle valve, said air feed means including an air control valve operatively connected to said control valve such that the opening area of the air control valve is decreased with the increase of the opening area of said control valve for the recirculated exhaust gas.