Auxiliary coolant tank for exhaust aftertreatment system

Abstract

An auxiliary coolant tank for an exhaust aftertreatment system is provided. The auxiliary coolant tank includes an inlet connection port and an outlet channel. The outlet channel includes a first portion and a second portion. The first portion extends parallel to a plane of a first side and a plane of an upper face. The first portion includes a fluid pick-up port at an end of the first portion. The fluid pick-up port is proximal to a first upper corner. The first portion is connected to the second portion at a location proximal to a second upper corner. The second portion extends parallel to a plane of the third side and the plane of the upper face. The second portion includes an outlet port at an end of the second portion.

What is claimed is: 
     
         1 . An exhaust gas aftertreatment system for an internal combustion engine, the exhaust gas aftertreatment system including at least one selective catalytic reduction (SCR) catalyst, at least one reductant injector configured to inject a reductant into the exhaust gas passage downstream from the exhaust portion of the internal combustion engine and a coolant circuit to cool the at least one reductant injector, wherein the coolant circuit includes a main coolant tank configured to deliver coolant to the at least one reductant injector and an auxiliary coolant tank in fluid communication with the at least one reductant injector and the main coolant tank, wherein the auxiliary coolant tank having an upper face, a lower face and four sides, the auxiliary coolant tank comprising:
 an inlet connection port structured and arranged in the lower face of the auxiliary coolant tank; and   an outlet channel including:
 a first portion extending parallel to a plane of a first side and a plane of the upper face, the first portion includes a fluid pick up port at an end of the first portion, wherein the fluid pick up port is proximal to a first upper corner defined by the first side, a second side, and the upper face; and 
 a second portion connected to the first portion at a location proximal to a second upper corner defined by the first side, the upper face, and a third side opposite to the second side, the second portion extends parallel to a plane of the third side and the plane of the upper face, wherein the second portion includes an outlet port at an end of the second portion. 
   
     
     
         2 . The exhaust gas aftertreatment system according to  claim 1 , wherein the outlet channel is L-shaped.