Patent ID: 8122710
Filing Date: 2012-02-28
Classification: F01N,Y02T

Abstract:
1. An internal combustion engine system comprising: combustion chambers within which fuel is combusted to operate the engine; a cooling system, including a coolant pump, for circulating liquid coolant through the engine; an exhaust system through which products of combustion that include NO a tank for holding a supply of aqueous urea; a supply pump for pumping aqueous urea from the tank into the exhaust system through a urea injector; and a heat exchange circuit comprising an inlet and an outlet in communication with the cooling system to provide for the coolant pump to flow liquid coolant through the heat exchange circuit; wherein a segment of the heat exchange circuit is disposed in heat exchange relationship with the urea injector, and downstream of that segment there is a controller for controlling the flow of coolant that has exchanged heat with the urea injector to a first branch that is in heat exchange relationship with the tank and the supply pump and a second branch that is not in heat exchange relationship with either the tank or the supply pump.