Internal combustion engine for motor vehicles

An internal combustion engine, comprising,

• an induction passage,
• a venturi formed in said induction passage,
• a throttle valve rotatably disposed in said induction passage for controlling the quantity of air-fuel mixture flow therethrough,
• a fuel reservoir,
• means for supplying fuel to said induction passage in accordance with the quantity of air flow through said induction passage,
• means for supplying additional fuel to said induction passage,
• said means for supplying additional fuel comprising an additional fuel valve means for controlling the additional fuel and a vacuum means for operating said additional fuel valve means,
• an exhaust passage communicating with said induction passage,
• passage means for recirculating a part of exhaust gases from said exhaust passage into said induction passage at the downstream of said throttle valve,
• a first valve means for controlling recirculation of exhaust gases through said recirculating passage means,
• a vacuum conduit communicating said first valve means with an atmospheric side of said throttle valve in said induction passage,
• said first valve means including a servo means operatively connected to said induction passage at a location positioned on the atmospheric side of and adjacent to said throttle valve when said throttle valve is closed in idle position through said vacuum conduit, a spring normally biasing said first valve means for blocking flow of exhaust gases through said recirculating passage means, said first valve means for being acted on by vacuum in said induction passage against said spring to permit the flow of exhaust gases through said recirculating passage means,
• a first conduit for operatively connecting said vacuum means with said induction passage downstream of said throttle valve,
• means for controlling the vacuum applied to said vacuum means through said first conduit,
• said means for controlling the vacuum including a solenoid valve means adapted for actuation simultaneously with actuation of said first valve means for controlling the vacuum applied to said vacuum means for the supply of the additional fuel.