公开(公告)号：US20190211740A1

公开(公告)日：2019-07-11

申请号：US15868298

申请日：2018-01-11

Applicant: GM Global Technology Operations LLC

Inventor： Thomas LAROSE, JR. ,  Nicholas Girardi ,  Douglas C. Sarsen ,  Michael A. Smith

IPC: F01P7/16 ,  F01P3/20 ,  F01P5/12 ,  F01P7/04 ,  F01N5/02

Abstract: A coolant control system of a vehicle includes a coolant pump that pumps coolant to a heat exchanger. A diesel exhaust fluid (DEF) injector injects a DEF into an exhaust system and receives coolant output from the heat exchanger. A fuel heat exchanger transfers heat between coolant and fuel flowing through the fuel heat exchanger. An engine control module is configured to determine a first requested speed for DEF injector cooling, determine a second requested speed for fuel cooling, and based on at least one of the first and second requested speeds, selectively increase at least one of: opening of a valve that controls a flow rate of fuel flowing from the fuel rail to the fuel tank, a flow rate of fuel from fuel injectors of an engine to the fuel tank, and a target speed of the coolant pump.