Patent ID: 8181448
Filing Date: 2012-05-22
Classification: F01N,Y02A,Y02T

Abstract:
1. A system for controlling urea injection quantity of a vehicle, comprising: an SCR (selective catalytic reduction) device connected to an exhaust pipe of an engine, the SCR device purifying NOx included in exhaust gas of the engine by using a reduction reaction between NH a pump configured to supply the SCR device with a urea solution from a urea tank through a urea supply line; a dosing injector disposed on the exhaust pipe at an upstream side of the SCR device and injecting the urea solution into the exhaust pipe, wherein the urea supply line connects the pump and the dosing injector; and a control portion that closes the dosing injector so as not to exhaust the urea solution that is charged in the urea supply line in the case that operation of the engine is stopped and an outside temperature is higher than a predetermined base temperature, and that stops the pump and opens the dosing injector so as to exhaust the urea solution charged in the urea supply line to the urea tank in the case that operation of the engine is stopped and the outside temperature is equal to or lower than the predetermined base temperature.