Patent ID: 8726641
Filing Date: 2014-05-20
Classification: F01N,Y02T

Abstract:
1. A method for controlling injection of Diesel Exhaust Fluid into an exhaust pipe of an internal combustion engine equipped with a Selective Reduction Catalyst, comprising: monitoring a value of a control parameter influencing an operation of the Selective Reduction Catalyst; injecting a quantity of Diesel Exhaust Fluid; controlling the quantity of Diesel Exhaust Fluid injected with a closed loop procedure when the value of the control parameter is below a first threshold value; and controlling the quantity of Diesel Exhaust Fluid injected with an open loop procedure when the value of the control parameter is above the first threshold value, wherein the control parameter is an exhaust gas flow rate upstream the Selective Reduction catalyst, and wherein the switching from the closed loop procedure to the open loop procedure is performed when the value of the exhaust gas flow rate exceeds a first threshold value of the exhaust gas flow rate.