System and method for filling reductant tank

Abstract

A method for filling a reductant tank is disclosed. The method includes creating a lower air pressure within the reductant tank than a pressure of an external reductant reservoir using the first valve, the second valve, and the venturi. The method also includes determining a level of a reductant in the reductant tank. The method further includes engaging the tank fill coupling mechanism with the external reductant reservoir. The method includes supplying the reductant from the external reductant reservoir into the reductant tank based on a pressure difference between the air pressure within the reductant tank and the pressure of the external reductant reservoir. The method also includes shutting-off the supply of the reductant based, at least in part, on the level of the reductant in the reductant tank. The method further includes disengaging the tank fill coupling mechanism from the external reductant reservoir.

What is claimed is: 
     
         1 . A method for filling a reductant tank, the method comprising:
 connecting an injector supply conduit to the reductant tank and an injector;   providing a driving fluid source in fluid communication with the reductant tank via a dose driving conduit;   connecting a purge conduit with the driving fluid source and the reductant tank;   providing a first valve in fluid communication with the reductant tank via the dose driving conduit and the purge conduit;   providing a second valve in fluid communication with the reductant tank via the purge conduit;   providing a venturi in fluid communication with the first valve and the second valve;   providing a tank fill coupling mechanism in fluid communication with the reductant tank via a fill conduit;   creating a lower air pressure within the reductant tank than a pressure of an external reductant reservoir using the first valve, the second valve, and the venturi;   determining a level of a reductant in the reductant tank;   engaging the tank fill coupling mechanism with the external reductant reservoir;   supplying the reductant from the external reductant reservoir into the reductant tank based on a pressure difference between the air pressure within the reductant tank and the pressure of the external reductant reservoir;   shutting-off the supply of the reductant based, at least in part, on the level of the reductant in the reductant tank; and   disengaging the tank fill coupling mechanism from the external reductant reservoir.