초록 ▼

A method and a device for reducing NO.sub.x emissions from a diesel engine is disclosed. The engine has an inlet system for introducing air into the engine, an exhaust system for exhausting gases from the engine and a branch conduit connecting the exhaust system with the inlet system to permit recir

A method and a device for reducing NO.sub.x emissions from a diesel engine is disclosed. The engine has an inlet system for introducing air into the engine, an exhaust system for exhausting gases from the engine and a branch conduit connecting the exhaust system with the inlet system to permit recirculation of a portion of exhaust gases. A flow control valve is provided which is associated with the branch conduit for regulating the portion of exhaust gases flowing through the branch conduit. The engine further includes control means responsive to particular engine parameters. The control means is employed to effect regulation of the flow control valve based on values of the engine parameters. The control means determine when the engine is running below a predetermined maximum speed, and opens the flow control valve only when the engine is running below the predetermined maximum speed.

대표청구항 ▼

[ What is claimed is:] [1.] A method for reducing NO.sub.x emissions from a diesel engine during idling, said engine comprisingan inlet system for introducing air into the engine;an exhaust system for exhausting gases from the engine;a branch conduit connecting said exhaust system with said inlet sy

[ What is claimed is:] [1.] A method for reducing NO.sub.x emissions from a diesel engine during idling, said engine comprisingan inlet system for introducing air into the engine;an exhaust system for exhausting gases from the engine;a branch conduit connecting said exhaust system with said inlet system to permit recirculation of a portion of exhaust gases;a flow control valve associated with said branch conduit for regulating the portion of exhaust gases flowing through said branch conduit; andcontrol means responsive to particular engine parameters, said control means effecting regulation of said flow control valve based on values of said engine parameters; said method comprising the steps of:employing the control means to detect when the engine is running below a predetermined maximum speed, andopening said flow control valve only when the control means detects that the engine is running below said predetermined maximum speed.