Patent ID: 9638086
Date: 2017-05-02
CPC Classifications: F01N,G01M,Y02T

Claim:
1. A leak detection method of a reducing agent pumping system including a reducing agent tank, an injector, a line formed through the reducing agent tank and the injector, and a pumping module disposed in the line, the method comprising: pumping a reducing agent to the injector with a pump of the pumping module and detecting a pressure of the reducing agent; operating the pump at a predetermined load or less and stopping an operation of the injector, when it is determined that a detected pressure is larger than a first set value and smaller than a second set value which is larger than the first set value; operating a heater for heating the reducing agent in the pumping module for a predetermined time; and determining that leak occurred in the line between the pumping module and the injector, when it is determined a temperature of the reducing agent in the pumping module is lower than a predetermined value.