Patent ID: 6422218
Filing Date: 2002-07-23
Classification: F02M

Abstract:
An apparatus for recycling exhaust gases in an internal combustion engine having an air filter, an air intake duct leading from said air filter to the engine, and a throttle valve in said air intake duct; said apparatus comprising an exhaust gas recirculation control valve having first and second inlets and an outlet communicating with said air intake duct between the throttle valve and the engine, an exhaust gas recirculation line leading from an exhaust pipe of the engine to the first inlet of said control valve, and a fresh air line leading from a filtered air source to the second inlet of said control valve, wherein said control valve admixes controlled amounts of exhaust gas and fresh air to produce an air/exhaust gas mixture for introduction into said intake duct and introduces a predeterminable amount of recycled exhaust gas admixed with a prescribed ratio of fresh air into the intake duct of the internal combustion engine, said control valve being cyclically operated such that the prescribed ratio of fresh air to exhaust gas can be adjusted, and wherein the fresh air has a temperature of about 60Â° C.; the exhaust gas a temperature of about 222Â° C., and the cycles of the cyclically operated valve are selected such that the proportion exhaust gas in the air/exhaust gas mixture lies in the range from 20% to 40%.