公开(公告)号：US20180230880A1

公开(公告)日：2018-08-16

申请号：US15751564

申请日：2016-09-21

Applicant: ROBERT BOSCH GMBH

Inventor： Andrew EVANS ,  Oliver WINTERSTELLER ,  Andres MURUBE LINDAHL ,  Palanimuthu THALAMUTHU

IPC: F01N3/20 ,  F01N9/00 ,  F01N11/00

CPC classification number: F01N3/2066 ,  F01N3/208 ,  F01N9/00 ,  F01N11/00 ,  F01N2550/05 ,  F01N2560/08 ,  F01N2610/02 ,  F01N2610/14 ,  F01N2610/144 ,  F01N2610/1446 ,  F01N2610/1453 ,  F01N2610/146 ,  F01N2610/1473 ,  F01N2900/1808 ,  F01N2900/1821 ,  F01N2900/1822 ,  Y02T10/24 ,  Y02T10/47

Abstract: A diesel exhaust fluid (DEF) delivery system and method for operating same. The method includes controlling a pump to operate at an idle speed to pressurize a pressure line. The method includes controlling a backflow dosing module (BFDM) valve to open to allow an amount of the DEF to flow into a fluid storage tank through a backflow line. The method includes determining a dosing request, a first dosing actuation request for the first dosing valve and a second dosing actuation request for the second dosing valve based on the dosing request. The method includes, when a sum of the first and second dosing actuation requests is less than 100%, controlling the BFDM valve to close when either of the first and second dosing valves is open; and controlling the BFDM valve to open when the first dosing valve is closed and the second dosing valve is closed.