Device for reducing toxicity of I.C. carburettor engine under forced idling conditions

Apparatus for reducing the toxicity of the exhaust from I.C. carburetor-fed engines under forced idling conditions, comprising:

• a carburetor having an idling system including outlet channels;
• an economizer adapted to cut off the flow of fuel through said channels during deceleration and installed on the carburetor;
• an inlet manifold and a pressure regulator installed thereon comprising a body mounting a spring-loaded valve adapted to vent said inlet manifold to the atmosphere, said spring-loaded valve being installed in said regulator body so that it forms, together with its inner surface and seat, an adjacent circular gap communicating with said economizer;
• two movable partitions mounted in said pressure regulator, each connected with said valve and body and forming, together with the inner surface of said body, three consecutively arranged variable-volume chambers, one of which accommodates said valve spring and communicates with the carburetor space downstream of the throttle in the zone of the lower edge of the closed throttle at the side opposite to said outlet channels of the idling system, the second chamber located between said movable partitions communicating with said circular gap and the third chamber communicating with the atmosphere;
• and a pressure corrector adapted to put said second chamber in communication with the atmosphere and adapted to adjust pressure in said second chamber in accordance with engine speed.