US 11,939,897 B2
Autonomous auxiliary DEF supply system with purge control
George Fell, Norwalk, CA (US); and Patrick Joseph Weaver, Anaheim, CA (US)
Assigned to Multiquip Inc., Cypress, CA (US)
Filed by Multiquip, Inc., Cypress, CA (US)
Filed on Dec. 27, 2022, as Appl. No. 18/089,286.
Application 18/089,286 is a continuation of application No. 17/063,238, filed on Oct. 5, 2020, granted, now 11,536,186, issued on Dec. 27, 2022.
Application 17/063,238 is a continuation of application No. 16/048,264, filed on Jul. 28, 2018, granted, now 10,794,257, issued on Oct. 6, 2020.
Prior Publication US 2023/0212974 A1, Jul. 6, 2023
Int. Cl. F01N 13/00 (2010.01); F01N 3/20 (2006.01); F01N 9/00 (2006.01)
CPC F01N 13/002 (2013.01) [F01N 3/206 (2013.01); F01N 3/2066 (2013.01); F01N 3/208 (2013.01); F01N 9/005 (2013.01); F01N 2590/10 (2013.01); F01N 2610/02 (2013.01); F01N 2610/1406 (2013.01); F01N 2610/1413 (2013.01); F01N 2610/142 (2013.01); F01N 2610/144 (2013.01); F01N 2610/1493 (2013.01); F01N 2900/1811 (2013.01); F01N 2900/1814 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for supplying diesel exhaust fluid (DEF) to an onboard DEF tank, comprising:
an auxiliary DEF tank having an onboard microprocessor-based controller;
an auxiliary DEF supply line configured for fluid communication between the auxiliary DEF tank and the onboard DEF tank;
a pump having a pump inlet and configured to force fluid from the pump inlet through the auxiliary DEF supply line;
an air inlet;
a three-way valve configured to switch between a first state which couples the auxiliary DEF tank to the pump inlet, and a second state which couples the air inlet to the pump inlet; and
wherein the controller is configured to execute a routine encoded in software for determining a failure in the system, wherein the routine comprises the following steps:
(a) receiving a low DEF level signal from an engine control module of a diesel engine;
(b) running the pump for one fill cycle;
(c) after completion of the fill cycle, automatically pausing the system for a predetermined amount of time, wherein the predetermined amount of time the system is paused is sufficient to allow DEF delivered to the onboard DEF tank to stabilize in the onboard DEF tank;
(d) reading an updated stabilized DEF level signal from the engine control module and comparing the updated stabilized signal to a validation point;
(e) if the updated stabilized DEF level signal fails the comparison to the validation point, determining whether a maximum number of similar failures have occurred; and
(f) if the maximum number of similar failures has occurred, stopping the pump.