Patent ID: 9200557
Filing Date: 2015-12-01
Classification: F01N,Y02A,Y02T,Y10T

Abstract:
1. A method pertaining to an SCR system for an engine, the method comprising: supplying reducing agent in liquid form from a container to a pump and then supplying said reducing agent by the pump to at least one consumption point in the SCR system; continuously detecting the feed pressure furnished by the pump and reporting the feed pressure to an automated controller; determining automatically a presence of air upstream of the pump based on the feed pressure reported; continuously detecting an increase or decrease in the feed pressure when the presence of the air upstream of the pump is determined; and controlling the pump automatically, by the automated controller, when the presence of the air is determined, such that a pump speed is increased according to the increase in the feed pressure, and the pump speed is decreased according to the decrease in the feed pressure.