RETURN CONTROL SYSTEM

摘要

Provided is a return control system for implementing return to normal status by resolving malfunctioning of a dosing valve or clogging of a liquid transfer line through which urea water flows. A return control system for returning to normal status when a dosing valve (104) malfunctions, wherein the return control system is provided with: anomaly detection means for detecting anomalies in the dosing valve (104); and return control means for controlling a supply module (106) in order to return urea water inside the dosing valve (104) to a urea tank (105) when a dosing valve (104) anomaly has been detected by the anomaly detection means.