Patent ID: 8931254
Filing Date: 2015-01-13
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. An exhaust pipe injection control device comprising: a filter which is installed in an exhaust pipe of an engine and which collects particulate matter; an exhaust gas recirculation device which circulates exhaust gas from an exhaust manifold to an intake manifold of the engine according to a degree of opening of the exhaust gas recirculation device; an exhaust pipe injector which is installed upstream of the filter in the exhaust pipe and downstream of the exhaust gas recirculation device, and which injects an amount of fuel into the exhaust pipe during regeneration of the filter; and a controller which controls the degree of opening of the exhaust gas recirculation device during the filter regeneration to perform exhaust gas recirculation, wherein the controller controls the degree of opening of the exhaust gas recirculation device by referring to an engine rotation speed and a fuel injection amount of the engine, and the degree of opening of the exhaust gas recirculation device is fully closed when the fuel injection amount of the engine is equal to or under a predetermined value.