| 摘要 |
A system for controlling urea injection quantity of a vehicle, may include an SCR device, the SCR device purifying NOx, a pump configured to supply the SCR device with a urea solution of a urea tank through a urea supply line, a dosing injector disposed on the exhaust pipe at upstream side of the SCR device and injecting the urea solution, and a control portion that closes the dosing injector not to exhaust the urea solution that is charged in the urea supply line if operation of the engine is stopped and outside temperature is higher than a predetermined base temperature, and that stops the pump and opens the dosing injector to exhaust the urea solution charged in the urea supply line to the urea tank if operation of the engine is stopped and the outside temperature is equal to or lower than the predetermined base temperature.
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