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US 11,598,240 B2Granted
Systems and methods for estimating diesel exhaust fluid volume
AssigneeFord Global Technologies, LLC
InventorsThaddeus A Chmielewski, Gurpreet Matharu, Marcus Bengtsson, Carlos Armesto, Bret Alan Zimmerman, Jim Bromham
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for estimation of a volume of liquid diesel exhaust fluid (DEF) contained within a DEF tank. In one example, a method for the estimation of the volume of liquid DEF in a DEF tank during DEF freezing conditions may include activating a heater contained within the DEF tank, and then switching estimation of the volume of liquid DEF via a first transfer function to estimation of the volume of liquid DEF via a second transfer function.
Claims5
A method, comprising:
- during a liquid diesel exhaust fluid (DEF) in freezing conditions,
- for a first vehicle including a first tank for storing the liquid DEF with a first heater for thawing frozen DEF, estimating a volume of the liquid DEF in the first tank using a freezing conditions transfer function during freezing in the first tank, and using a first non-freezing conditions transfer function specific to the first vehicle during non-freezing conditions;
- and
- for a second vehicle including a second tank for storing the liquid DEF with a second heater for thawing frozen DEF, estimating a volume of the liquid DEF in the second tank using the freezing conditions transfer function during freezing in the second tank, and using a second non-freezing conditions transfer function specific to the second vehicle during non-freezing conditions, the first tank is different in size and/or shape from the second tank while the first heater in the first tank is identical to the second heater in the second tank, wherein the freezing conditions transfer function is identical for the first vehicle and the second vehicle.
1 more element
Dependencies are inferred from the claim text.