Patent ID: 9140166
Filing Date: 2015-09-22
Classification: B01D,F01N,Y02T

Abstract:
1. A reductant dosing system for an engine, comprising: a reservoir accommodating reductant fluid; the reservoir fluidly connected to an inlet of a reductant pump, the reductant pump having an outlet fluidly connected to the reservoir, an inlet of a pressure regulator and an inlet of an injector; the pressure regulator including a reductant pressure control valve that fluidly connects the outlet of the reductant pump to the reservoir when the reductant pressure control valve is in an open position; a compressed gas source fluidly connected to an air supply control valve that fluidly connects the compressed gas source to the reservoir when the air supply control valve is in an open position, the air supply control valve also having a closed position, the air supply control valve being linked to a controller for shifting the air supply control valve between the open and closed positions; and a pressure sensor fluidly connected to the outlet of the reductant pump and linked to the controller, wherein when a pressure of the outlet of the reductant pump falls below a predetermined value, the controller opens the air supply control valve.