Exhaust gas recirculation system
AssigneeNissan Motor Co., Ltd.
InventorYasutaka Yoshiba
Life of this patent
Estimating the term…
Abstract
In a diesel engine having a turbocharger for feeding supercharged air to the engine, an exhaust gas recirculation passage communicates between the exhaust passage from the engine and the intake passage to a compressor of the turbocharger. A first control valve closes the exhaust gas recirculation passage when the output pressure of the air leading from the compressor is lower than a first predetermined value or higher than a second predetermined value which is higher than the first predetermined value. A second control valve may be further provided within the exhaust gas recirculation passage so as to close the exhaust gas recirculation passage when the load applied to the engine is above a predetermined value.
Claims5
In a diesel engine having a turbocharger which includes a compressor for supplying compressed air to the engine, and which includes a turbine driven by exhaust gas from the engine for rotating the compressor, an exhaust gas recirculation system comprising:
- a recirculation passage connecting the exhaust side of the engine and the intake side of the compressor for carrying the exhaust gas from the engine to the compressor;
- a control valve disposed within said recirculation passage;
- and
- valve actuating means associated with said valve for sensing compressor output pressure and for causing said control valve to close said recirculation passage when the sensed compressor output pressure is lower than a first predetermined value, and when the sensed compressor output pressure is higher than a second predetermined value, the second predetermined value being higher than the first predetermined value.
Dependencies are inferred from the claim text.