# US 11,905,867 B2 · Systems and methods for controlling exhaust gas aftertreatment sensor systems

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- Number: US 11,905,867 B2
- Document ID: US11905867B2
- Status: Granted
- Kind: B2
- Application number: 17/740,891
- Filed: 2022-05-10
- Published: 2022-08-25
- Granted: 2024-02-20
- Earliest claimed: 2019-08-29
- Assignees: Cummins Emission Solutions Inc.
- Applicants: Cummins Emission Solutions Inc.
- Inventors: Nathan A. Ottinger; M. Yusuf Khan; Z. Gerald Liu; Shirish Ambadas Shimpi
- Web page: https://patentgrep.com/patent/US11905867B2

## CPC

- F01N 3/0842: {Nitrogen oxides}
- F01N 3/035: with catalytic reactors
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 3/106: {Auxiliary oxidation catalysts}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00)
- F01N 13/008: {Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439)}
- F01N 13/0093: {the purifying devices are of the same type}
- F01N 2240/14: a fuel burner
- F01N 2250/02: filtering and catalytic conversion
- F01N 2560/02: the means being an exhaust gas sensor
- F01N 2560/05: the means being a particulate sensor
- F01N 2560/08: the means being a pressure sensor
- F01N 2570/14: Nitrogen oxides
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F01N 2900/0416: using the state of a sensor, e.g. of an exhaust gas sensor
- F01N 2900/1404: Exhaust gas temperature
- F01N 2900/16: said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N 2900/18: said parameters being related to the system for adding a substance into the exhaust
- Y02T 10/40: Engine management systems
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust gas aftertreatment system includes: a first sensor configured to measure a parameter in the exhaust gas aftertreatment system; a second sensor configured to measure the parameter in the exhaust gas aftertreatment system, the second sensor disposed proximate the first sensor; and at least one controller configured to alternately receive sensor values from the first sensor for a first target period of time, and receive sensor values from the second sensor for a second target period of time.

## Claims

### Claim 1

An exhaust gas aftertreatment system comprising:
an exhaust gas conduit comprising a peripheral wall;
a first sensor attached to the peripheral wall of the exhaust gas conduit and configured to measure a parameter in the exhaust gas aftertreatment system,;
a second sensor attached to the peripheral wall of the exhaust gas conduit and configured to measure the parameter in the exhaust gas aftertreatment system, the second sensor disposed proximate the first sensor; and
at least one controller configured to alternately:
receive sensor values from the first sensor for a first predetermined period of time, and
subsequently receive sensor values from the second sensor for a second predetermined period of time,
subsequently receive sensor values from the first sensor for the first predetermined period of time, and
subsequently receive sensor values from the second sensor for the second predetermined period of time.

### Claim 2 (depends on 1)

The exhaust gas aftertreatment system of claim 1, wherein:
the at least one controller is configured to:
determine a difference between a first sensor value received from the first sensor and a calculated sensor value based on at least one aftertreatment operating condition and/or at least one engine operating condition,
determine a difference between a second sensor value received from the second sensor and the calculated sensor value based on the at least one aftertreatment operating condition and/or the at least one engine operating condition,
if the difference between the first sensor value and the calculated sensor value is greater than or equal to a threshold value, deactivate the first sensor and receive sensor values only from the second sensor, and
if the difference between the second sensor value and the calculated sensor value is greater than or equal to the threshold value, deactivate the second sensor and receive sensor values only from the first sensor.

### Claim 3 (depends on 2)

The exhaust gas aftertreatment system of claim 2, further comprising:
a third sensor disposed proximate the first sensor and the second sensor and configured to
measure the parameter in the exhaust gas aftertreatment system;
wherein the at least one controller is further configured to:
alternately receive sensor values from the third sensor for a third predetermined period of time,
determine a difference between a third sensor value received from the third sensor and the calculated sensor value,
if the difference between the third sensor value and the calculated sensor value is greater than or equal to the threshold value, deactivate the third sensor and receive sensor values only from the second sensor, and
if the difference between the second sensor value and the calculated sensor value is greater than or equal to the threshold value, deactivate the second sensor and receive sensor values only from the third sensor.

### Claim 4 (depends on 1)

The exhaust gas aftertreatment system of claim 1, wherein the first sensor includes at least one of a multiple gas sensor, a particulate matter sensor, a particulate number sensor, or a delta pressure sensor.

### Claim 5 (depends on 1)

The exhaust gas aftertreatment system of claim 1, wherein the first sensor includes a plurality of sensing elements.

### Claim 6 (depends on 1)

The exhaust gas aftertreatment system of claim 1, wherein the first sensor includes a first filter and the second sensor includes a second filter.

### Claim 7 (depends on 1)

The exhaust gas aftertreatment system of claim 1, wherein the first sensor and the second sensor are disposed at different peripheral locations of the exhaust gas conduit in a cross-section of the exhaust gas conduit that is perpendicular to a longitudinal axis of the exhaust gas conduit.

### Claim 8 (depends on 1)

The exhaust gas aftertreatment system of claim 1, wherein a distance between the first sensor and the second sensor is less than or equal to 3 inches.

### Claim 9 (depends on 1)

The exhaust gas aftertreatment system of claim 1, wherein a distance between the first sensor and the second sensor is less than or equal to 1 inch.