DEF injector cooling system and method

Abstract

A DEF injector cooling system may include a mechanical pump, an electric pump, and a controller. The mechanical pump may be rotatably coupled to an engine so as to be driven by the engine. The mechanical pump may be fluidly connected to the engine, a DEF injector, and a heat exchanger, and configured to pump coolant through these components. The electric pump may be fluidly connected to the DEF injector and configured to pump coolant through it. The controller may be configured to receive an ambient temperature signal indicative of an ambient temperature and power the electric pump after a shutdown of the engine for a period of time, the duration of the period of time based on the ambient temperature signal.

Dependencies are inferred from the claim text.