Exhaust gas recirculation control system for internal combustion engine

An exhaust gas recirculation control system of an internal combustion engine comprising:

• a core formed therein with a hollow passage opened at its end;
• a plunger made of a magnetic material and being movable in the axial direction of said core, said plunger having a valve seat opposing the open end of said core;
• a spring biasing said plunger to bring a valve portion comprised of said open end and said valve seat into an open state;
• a first exciting coil applying a force to said plunger to move said plunger in the closing direction in opposition to the bias of said spring;
• a second exciting coil applying to said plunger a force substantially opposite to the force which said first exciting coil applies to said plunger;
• a housing defining a chamber which incorporates said valve portion;
• at least one opening formed in said housing and being in communication with a portion at a pressure substantially equal to external atmospheric pressure;
• a flow-electricity transducer generating an electric signal depending on the amount of inlet air of the internal combustion engine and applying said electric signal to said first exciting coil;
• means for communicating the hollow passage of said core to the downstream of a throttle valve;
• an exhaust gas recirculation passage passing recirculation of partial exhaust gas of the internal combustion engine into a mixture introduced into said internal combustion engine;
• a control valve disposed in said exhaust gas recirculation passage, for controlling the amount of exhaust gas recirculation in response to a negative pressure in the hollow passage of said core;
• an orifice disposed in said exhaust gas recirculation passage, for generating a negative pressure at the upstream of said control valve;
• and
• a pressure-electricity transducer generating an electric signal in inverse proportion to the pressure downstream of said orifice and applying said electric signal to said second exciting coil.