Patent Document ID: 10139842
Application ID: 15868341
Patent Flag: 1

Claim One:
1. An exhaust system comprising: an engine adapted to generate exhaust gas while burning fuel and air; an intake pipe connected to and supplying the air to the engine; an exhaust pipe connected to the engine, the exhaust gas flowing through the exhaust pipe; an SCR catalyst mounted on the exhaust pipe and adapted to reduce nitrogen oxide contained in the exhaust gas using a reducing agent; a reducing agent supplier mounted on the exhaust pipe between the engine and the SCR catalyst and adapted to inject the reducing agent; an input variable detector adapted to detect input variables; and a controller including a control logic for calculating an injection amount of the reducing agent for the SCR catalyst and adapted to control the reducing agent supplier according to the injection amount of the reducing agent, wherein the controller is adapted to discretize the input variables, to standardize the discretized input variables, and to correct the control logic in response to determining that the discretized input variables are within a correction range, and wherein the controller discretizes the input variables by equations f Temp = T Cat - T 0 Δ ⁢ ⁢ T Discret ⁢ ⁢ and ⁢ ⁢ f dm EG = dm EG - dm 0 Δ ⁢ ⁢ dm Discret , wherein f Temp is discretized temperature of the SCR catalyst, T Cat is the temperature of the SCR catalyst, T 0 is reference temperature, ΔT Discret is unit temperature, f dm _ EG is discretized exhaust flow rate, dm_EG is the exhaust flow rate, dm 0 is reference exhaust flow rate, and Δdm Discret is unit exhaust flow rate.