VEHICULAR AIR-POLLUTION PREVENTIVE SYSTEM

摘要

A vehicular air-pollution preventive system serious use with an internal combustion engine, which system is adapted to reduce the quantity of nitrogen oxides produced during acceleration or hill-climbing in such quantities as to cause a serious air-pollution problem especially when the vehicle is driven in urban areas, having switches closing when the vehicle is driven under predetermined conditions providing the acceleration or hill-climbing and a solenoid valve which is adapted to pass exhaust gases from the exhaust manifold to the intake manifold when the switches are closed concurrently. The conditions in which the switches are closed concurrently are represented by variables such as the combination of angular position of a carburetor throttle valve and engine speed or vehicle speed.