BRIEF DESCRIPTION OF THE DRAWINGS
[0009] A full and enabling disclosure of the present technology, including the best
mode thereof, directed to one of ordinary skill in the art, is set forth in the
specification, which makes reference to the appended figures, in which:
4
[0010] FIG. 1 illustrates a perspective view of one embodiment of an
aftertreatment system in accordance with aspects of the present subject matter;
[0011] FIG. 2 illustrates a perspective view of one embodiment of a sensor
module of an aftertreatment sensor of an aftertreatment system in accordance with
aspects of the present subject matter;
[0012] FIG. 3 illustrates a cross-sectional view of the sensor module taken
generally about Line 3-3 in FIG. 2;
[0013] FIG. 4 illustrates a perspective view of one embodiment of a sensor
assembly of an aftertreatment system in accordance with aspects of the present subject
matter;
[0014] FIG. 5 illustrates a cross-sectional view of the sensor assembly taken
generally about Line 5-5 in FIG. 4; and
[0015] FIG. 6 illustrates a cross-sectional view of the sensor assembly taken
generally about Line 6-6 in FIG. 4;
[0016] Repeat use of reference characters in the present specification and
drawings is intended to represent the same or analogous features or elements of the
present technology.
DETAILED DESCRIPTION OF THE DRAWINGS
[0017] Reference now will be made in detail to embodiments of the invention,
one or more examples of which are illustrated in the drawings. Each example is
provided by way of explanation of the invention, not limitation of the invention. In
fact, it will be apparent to those skilled in the art that various modifications and
variations can be made in the present invention without departing from the scope or
spirit of the invention. For instance, features illustrated or described as part of one
embodiment can be used with another embodiment to yield still a further
embodiment. Thus, it is intended that the present invention covers such modifications
and variations as come within the scope of the appended claims and their equivalents.
[0018] In general, the present subject matter is directed to a sensor assembly for
an aftertreatment system of a work vehicle, such as an agricultural vehicle or a
construction vehicle. As will be described below, the aftertreatment system may
include an aftertreatment device configured to reduce the amount of one or more
5
pollutants, such as nitrogen oxides or NOx, carbon monoxide, hydrocarbons, or the
like, that are present within an exhaust gas stream flowing therethrough. For
example, in one embodiment, the aftertreatment device may include a diesel oxidation
catalyst, a diesel particulate filter, a mixer, and/or a selective catalytic reduction
catalyst.
[0019] Furthermore, in several embodiments, the disclosed sensor assembly
includes an aftertreatment sensor provided in operative association within the
aftertreatment device. The aftertreatment sensor, in turn, includes a sensor module,
which may be mounted to the exterior of the aftertreatment device. For example, in
one embodiment, the sensor module may include a housing in which a printed circuit
board or other electronic components are positioned. In this respect, the sensor
module may include insulation and/or heat shielding (e.g., that is positioned within or
otherwise integrated into the housing). Additionally, the sensor module includes a
first side and a second side spaced apart from the first side along a first direction (e.g.,
a vertical direction). Moreover, the aftertreatment sensor includes a sensing probe,
which may be in contact with the exhaust gas stream, and a wire extending from the
sensor module to the sensing probe.
[0020] In addition, in several embodiments, the disclosed sensor assembly
includes first and second insulating members. Specifically, in such embodiments, the
first insulating member is installed on the first side of the sensor module, while the
second insulating member is installed on the second side of the sensor module. In
addition, in some embodiments, one or more gaps may be defined between the first
and second insulating members in the first direction. For example, in one such
embodiment, the wire may extend through one of the gaps such that the sensing probe
is positioned outside of or is otherwise external to the first and second insulating
members.
[0021] In operation, the disclosed sensor assembly allows for the aftertreatment
sensor to withstand increased temperature, such as those from leaking exhaust gases,
while still providing cooling to the sensor module. Specifically, the first and second
insulating members can withstand direct exposure to leaking exhaust gases and, thus,
protect the sensor module from the heat associated with such leaking exhaust gases.
That is, the first and second insulating members provide additional insulation and heat
6
shield beyond the insulation/heating shielding already present within the sensor
module. Furthermore, the gap allows airflow to the sensor module to cool the sensor
module (e.g., to cool the printed circuit board or components thereof), thereby
improving service life.
[0022] Referring now to the drawings, FIG. 1 illustrates a perspective view of one
embodiment of an aftertreatment system 10 for a work vehicle in accordance with
aspects of the present subject matter. As such, the aftertreatment system 10 may be
incorporated into an exhaust system (not shown) of a work vehicle (not shown) being
powered or otherwise driven by an internal combustion engine (not shown), such as a
diesel engine.
[0023] As shown, the aftertreatment system 10 includes an aftertreatment device
12. In general, the aftertreatment device 12 is, in turn, configured to reduce the
amount and/or concentration of certain pollutants, such as nitrogen oxides or NOx,
carbon monoxide, hydrocarbons, or the like, present within the exhaust gases
generated by the internal combustion engine. Specifically, in several embodiments,
the aftertreatment device 12 extends along a longitudinal direction 13 from a first or
upstream end 14 to a second or downstream end 16. In this respect, the aftertreatment
device 12 includes an inlet tube 18 defining an inlet opening 20 positioned at its
upstream end 14. Conversely, the aftertreatment device 12 includes an outlet tube 22
defining an outlet opening 24 positioned at its downstream end 16.
[0024] The aftertreatment device 12 may have any suitable structure or
configuration that allows for aftertreatment device 12 to reduce the amount and/or
concentration of certain pollutants present within exhaust gases. For example, in
some embodiments, the aftertreatment device 12 includes a diesel oxidation catalyst
26, a diesel particulate filter 28, a mixer 30, and/or a selective catalytic reduction
catalyst 32. Specifically, in the illustrated embodiment, the diesel oxidation catalyst
26 is positioned downstream of the inlet tube 18, the diesel particulate filter 28 is
positioned downstream of the diesel oxidation catalyst 26, the mixer 30 is positioned
downstream of the diesel particulate filter 28, and the selective catalytic reduction
catalyst 32 is positioned downstream of the mixer 30 and upstream of the outlet tube
22. In one embodiment, the various components of the aftertreatment device 12 may
be coupled together via clamps 34. However, in alternative embodiments, the
7
aftertreatment device 12 may have any other suitable configuration. For example, in
some alternative embodiments, the diesel oxidation catalyst 26, the diesel particulate
filter 28, the mixer 30, and/or the selective catalytic reduction catalyst 32 may not be
coupled together into a single module as shown in FIG. 1. Additionally, in further
embodiments, the aftertreatment device 12 may include any other suitable
components in addition to or in lieu of the diesel oxidation catalyst 26, the diesel
particulate filter 28, the mixer 30, and/or the selective catalytic reduction catalyst 32.
[0025] As indicated above, in operation, the aftertreatment device 12 reduces the
amount and/or concentration of certain pollutants present within exhaust gases (e.g.,
as indicated by arrow 36) generated by the internal combustion engine. Specifically,
the exhaust gases 36 enter the aftertreatment device 12 via the inlet opening 20. The
exhaust gases 36 may then flow sequentially through the inlet tube 18, the diesel
oxidation catalyst 26, the diesel particulate filter 28, the mixer 30, and the selective
catalytic reduction catalyst 32. As the exhaust gases 36 flow through each component
26, 28, 30, 32, the concentration of certain pollutants, such as nitrogen oxides or NOx,
carbon monoxide, hydrocarbons, and the like, is reduced. Thereafter, the exhaust
gases 36 flow into the outlet tube 22 and exit the aftertreatment device 12 via the
outlet opening 24 as treated exhaust gases (e.g., as indicated by arrow 38).
[0026] Furthermore, the aftertreatment system 10 includes a sensor assembly 100.
In general, the sensor assembly 100 includes an aftertreatment sensor 101 configured
to generate data indicative of one or more parameters associated the exhaust gases 36
flowing through the aftertreatment device 12. As such, several embodiments, the
aftertreatment sensor 101 includes a sensor module 102 (FIG. 2), a sensing probe 104,
and a wire 106. In such embodiments, the sensor module 102 may be mounted on the
exterior of the aftertreatment device 12. Additionally, in such embodiments, the
sensing probe 104 may be positioned such that it is in contact with the exhaust gases
36. For example, the sensing probe 104 may partially extend through the outlet tube
22 of the aftertreatment device 12 such that a portion of the sensing probe 104 is
positioned within the stream of the exhaust gases 36 flowing through the outlet tube
22. Moreover, the wire 106 extends from the sensor module 102 to the sensing probe
104, thereby electrically coupling the sensing probe 104 to the sensor module 102.
8
[0027] The aftertreatment sensor 101 may be configured as any suitable sensor or
sensing device configured to generate data indicative of one or more parameters
associated with an exhaust gas flow. For example, in some embodiments, the
aftertreatment sensor 101 may correspond to a nitrogen oxide or NOx sensor
configured to generate data indicative of the amount or concentration of nitrogen
oxides or NOx within the exhaust gases 36 exiting the aftertreatment device 12.
However, in alternative embodiments, the aftertreatment sensor 101 may be
configured as any other suitable type of sensor configured to generate any other
suitable type of data associated with the flow of exhaust gases 36 through the
aftertreatment device 12, such a temperature sensor, a pressure sensor, and/or the like.
[0028] In addition, the sensor assembly 100 includes first and second insulating
members 108, 110 installed on the sensor module 102. In this respect, the first and
second insulating members 108, 110 are positioned on the exterior of the
aftertreatment device 12. For example, in one embodiment, the second insulating
members 110 may be mounted on the exterior of the selective catalytic reduction
catalyst 32 via legs 112. Moreover, as shown, the sensing probe 104 is positioned
outside of or otherwise external to the first and the second insulating members 108,
110. As will be described below, the first and second insulating members 108, 110
are configured to protect the sensor module 102 from leaking exhaust gases.
[0029] FIGS. 2 and 3 illustrate differing views of one embodiment of the sensor
module 102 in accordance with aspects of the present subject matter. Specifically,
FIG. 2 illustrates a perspective view of the sensor module 102. Moreover, FIG. 3
illustrates a cross-sectional view of the sensor module 102 taken generally about Line
3-3 in FIG. 2.
[0030] In general, the sensor module 102 extends along a first direction (e.g., as
indicated by arrow 120) from a first side 116 to a second side 118. Thus, the first and
second sides 116, 118 are spaced apart from each other along the first direction 120.
Furthermore, the sensor module 102 extends along a second direction (e.g., as
indicated by arrow 126) from a third side 122 to a fourth side 124, with the second
direction 126 being perpendicular to the first direction 120. As such, the third and
fourth sides 122, 124 are spaced apart from each other along the second direction 126.
Moreover, the third side and fourth sides 122, 124 extend between the first and second
9
sides 116, 118 in the first direction 120. Additionally, the sensor module 102 extends
along a third direction (e.g., as indicated by arrow 132) from a fifth side 128 to a sixth
side 130, with the third direction 132 being perpendicular to the first and second
directions 120, 126. Thus, the fifth and sixth sides 128, 130 are spaced apart from
each other along the third direction 132. In addition, the fifth and sixth sides 128, 130
extend between the first and second sides 116, 118 in the first direction 120.
[0031] As shown, the sensor module 102 includes a housing 114. For example, in
the illustrated embodiment, the housing 114 includes a first surface 134 positioned at
the first side 116 of the sensor module 102 and a second surface 136 positioned at the
second side 118 of the sensor module 102. Additionally, in the illustrated
embodiment, the housing 114 includes a third surface 138 positioned at the third side
122 of the sensor module 102 and a fourth surface 140 positioned at the fourth side
124 of the sensor module 102. Moreover, in the illustrated embodiment, the housing
114 includes a fifth surface 142 positioned at the fifth side 128 of the sensor module
102 and a sixth surface 144 positioned at the sixth side 130 of the sensor module 102.
However, in alternative embodiments, the housing 114 may have any other suitable
configuration.
[0032] In general, the housing 114 is configured to enclose, protect, and/or
otherwise house one or more electrical components of the aftertreatment sensor 101.
Specifically, as particularly shown in FIG. 3, the housing 114 defines a chamber 146
in which one or more electrical components of the aftertreatment sensor 101 are
positioned. For example, in the illustrated embodiment, the sensor module 102
includes a printed circuit board 148 positioned within the chamber 146 and
electrically coupled to the wire 106. As such, the printed circuit board 148 may
generate electrical signals for transmission to the sensing probe 104 via the wire 106.
Alternatively, or additionally, the printed circuit board 148 may receive electrical
signals from the sensing probe 104 via the wire 106.
[0033] In alternative embodiments, the sensor module 102 may have any other
suitable configuration so long as the sensor module 102 includes one or more
electrical components of the aftertreatment sensor 101. For example, in some
embodiments, the sensor module 102 may include an electrical connector (not shown)
10
configured to receive and transmit electrical signals, such as from or to a computing
device(s) (not shown) of the work vehicle (not shown).
[0034] FIGS. 4-6 illustrate differing views of one embodiment of the sensor
assembly 100 in accordance with aspects of the present subject matter. Specifically,
FIG. 4 illustrates a perspective view of the sensor assembly 100. Moreover, FIG. 5
illustrates a cross-sectional view of the sensor assembly 100 taken generally about
Line 5-5 in FIG. 4. Additionally, FIG. 6 illustrates another cross-sectional view of the
sensor assembly 100 taken generally about Line 6-6 in FIG. 4.
[0035] As indicated above, the sensor assembly 100 includes the first and second
insulating members 108, 110. Specifically, as shown, the first insulating member 108
is installed on the first side 116 of the sensor module 102. Moreover, as shown, the
second insulating member 110 is installed on the second side 118 of the sensor
module 102. In this respect, the first and second insulating members 108, 110 are
configured to protect the sensor module 102 from leaking exhaust gases (e.g., any of
the exhaust gases 36 leaking from and/or adjacent to the aftertreatment device 12).
That is, the first and second insulating members 108, 110 can withstand direct
exposure to leaking exhaust gases and, thus, protect the sensor module 102 from the
heat associated with such leaking exhaust gases. For example, the first and second
insulating members 108, 110 may keep the sustained surface temperature of the
sensor module 102 below +140 degrees Celsius. As such, the first and second
insulating members 108, 110 provide additional insulation and heat shielding beyond
the insulation/heating shielding already present within the sensor module 102 (e.g.,
insulation/heating shielding incorporated into the housing 114 of the sensor module
102).
[0036] In several embodiments, the first insulating member 108 at least partially
covers the first side 116 of the sensor module 102 and partially covers the third,
fourth, fifth, and sixth sides 122, 124, 128, 130 of the sensor module 102. For
example, as shown in FIGS. 4 and 5, in some embodiments, the first insulating
member 108 may include a main portion 150 at least partially covering the first side
116 of the sensor module 102. As such, the main portion 150 of the first insulating
member 108 may be positioned on the first surface 134 of the housing 114 of the
sensor module 102. Additionally, the first insulating member 108 may include a lip
11
portion 152 partially covering the third, fourth, fifth, and sixth sides 122, 124, 128,
130 of the sensor module 102. For example, in one embodiment, the lip portion 152
may extend from the main portion 150 toward the second side 118 of the sensor
module 102 in the first direction 120. Thus, the lip portion 152 of the first insulating
member 108 may be positioned on portions of the third, fourth, fifth, and sixth
surfaces 138, 140, 142, 144 of the housing 114 that are adjacent to the first side 116 of
the sensor module 102.
[0037] Furthermore, in several embodiments, the second insulating member 110
at least partially covers the second side 118 of the sensor module 102 and partially
covers the third, fourth, fifth, and sixth sides 122, 124, 128, 130 of the sensor module
102. For example, as shown in FIGS. 4 and 5, in some embodiments, the second
insulating member 110 may include a main portion 154 at least partially covering the
second side 118 of the sensor module 102. As such, the main portion 154 of the
second insulating member 110 may be positioned on the second surface 136 of the
housing 114 of the sensor module 102. Additionally, the second insulating member
110 may include a lip portion 156 partially covering the third, fourth, fifth, and sixth
sides 122, 124, 128, 130 of the sensor module 102. For example, in one embodiment,
the lip portion 156 may extend from the main portion 150 toward the first side 116 of
the sensor module 102 in the first direction 120. Thus, the lip portion 156 of the
second insulating member 110 may be positioned on portions of the third, fourth,
fifth, and sixth surfaces 138, 140, 142, 144 of the housing 114 that are adjacent to the
second side 118 of the sensor module 102.
[0038] The first and second insulating members 108, 110 may be constructed
from any suitable materials and in any suitable manner. For example, the first and
second insulating members 108, 110 may be constructed from moldable insulation
formed from a suitable metallic material(s) capable operating in sustained
temperatures ranging from -20 degrees Celsius to +1200 degrees Celsius. For
example, such materials may include aluminum embossed foil, 304 stainless steel,
316 stainless steel, a titanium and stainless steel combination, and/or the like.
[0039] Furthermore, in several embodiments, one or more gaps 160 are defined
between the first and second insulating members 108, 110 in the first direction 120.
In general, the gap(s) 160 allows airflow to the sensor module 102 to cool the sensor
12
module 102 (e.g., to cool the printed circuit board 148 or components thereof),
thereby improving the service life of the aftertreatment sensor 101. Additionally, or
alternatively, the gap(s) 160 may provide clearance for certain components of the
aftertreatment sensor 101 that protrude from the sensor module 102, such as the wire
106. Specifically, in several embodiments, the gap(s) 160 may be defined between a
portion(s) of the lip 152 of the first insulating member 108 and a portion(s) of the lip
156 of the second insulating member 108 in the first direction 120. For example, as
particularly shown in FIG. 4, in some embodiments, one gap 160 is defined between
the first and second insulating members 108, 110 on the third side 122 of the sensor
module 102 and another gap 160 is defined between the first and second insulating
members 108, 110 on the sixth side 130 of the sensor module 102. As such, portions
of the third and sixth sides 122, 130 of the sensor module 102 and, more specifically,
portions of the third and sixth surfaces 138, 144 of the housing 114 are not covered by
the first and second insulating members 108, 110. In one embodiment, as shown in
FIGS. 4 and 6, the wire 106 may extend through the gap 160 (e.g., the gap 160
defined on the sixth side 130) to couple the sensor module 102, which is positioned
within the first and second insulating members 108, 110, to the sensing probe 104,
which is positioned outside of the first and second insulating members 108, 110.
However, in alternative embodiments, any other suitable number of gaps 160 may be
defined between the first and second insulating members 108, 110 in the first
direction 120 and/or such gap(s) 160 may positioned at any other suitable location(s)
relative to the sensor module 102. Moreover, in one embodiment, no gaps 160 may
be defined between the first and second insulating members 108, 110 (other than any
gap inherently present between the mating first and second insulating members 108,
110).
[0040] Referring particularly to FIG. 4, in some embodiments, the first and
second insulating members 108, 110 may cover at least eighty percent of and less than
ninety-five percent of the surface area of the sensor module 102. For example, in one
embodiment, the first and second insulating members 108, 110 may cover at least
eighty-five percent of and less than ninety percent of the surface area of the sensor
module 102. Such coverage of the first and second insulating members 108, 110 by
the first and second insulating members 108, 110 allows for the aftertreatment sensor
13
101 to withstand increased temperatures, such as those from leaking exhaust gases,
while still providing cooling to the sensor module 102.
[0041] Moreover, as shown in FIGS. 4-6, in some embodiments, the sensor
assembly 100 may include one or more fasteners 158. In general, the fastener(s) 158
is configured to couple the first and second insulating members 108, 110 to the sensor
module 102. For example, the fastener(s) 158 may extend from one of the first or
second insulating members 108, 110 to the other of the first or second insulating
members 108, 110. In one embodiment, the fastener(s) 158 may be spaced apart from
the sensor module 102. In such an embodiment, the first and second insulating
members 108, 110 can be installed onto the aftertreatment sensor 101 without any
modification to the aftertreatment sensor 101 (e.g., without forming holes that extend
through the aftertreatment sensor 101). Although two fasteners 158 are shown in the
illustrated embodiment, the sensor assembly 100 may include any other suitable
number of fasteners 158, such as one fastener 158 or three or more fasteners 158.
[0042] In addition, the fastener(s) 158 may have any suitable configuration for
coupling the first and second insulating members 108, 110 together. For example, in
the illustrated embodiment, the fasteners 158 are configured as threaded fasteners,
such as screws. However, in other embodiments, the fastener(s) 158 may be
configured as a press-fit fastener(s) (e.g., a pin(s)), a snap-fit fastener(s) (e.g., an
elastic hook(s) configured to be received in a complementary groove(s)), and/or the
like.
[0043] This written description uses examples to disclose the technology,
including the best mode, and also to enable any person skilled in the art to practice the
technology, including making and using any devices or systems and performing any
incorporated methods. The patentable scope of the technology is defined by the
claims, and may include other examples that occur to those skilled in the art. Such
other examples are intended to be within the scope of the claims if they include
structural elements that do not differ from the literal language of the claims, or if they
include equivalent structural elements with insubstantial differences from the literal
language of the claims.
14
WE CLAIM:
1. A sensor assembly (100) for an aftertreatment system (10) of a work
vehicle, the sensor assembly (100) comprising an aftertreatment sensor (101)
including a sensor module (102), a sensing probe (104), and a wire (106) extending
from the sensor module (102) to the sensing probe (104), the sensor module (102)
including a first side (116) and a second side (118) spaced apart from the first side
(116) along a first direction, the sensor assembly (100) characterized by:
a first insulating member (108) installed on the first side (116) of the sensor
module (102); and
a second insulating member (110) installed on the second side (118) of the
sensor module (102), the first and second insulating members (108, 110) configured
to protect the sensor module (102) from leaking exhaust gases.
2. The sensor assembly (100) as claimed in claim 1, wherein:
the sensor module (102) further includes:
a third side (122) extending between the first and second sides (116,
118) in the first direction;
a fourth side (124) extending between the first and second sides (116,
118) in the first direction, the fourth side (124) being spaced apart from the
third side (122) in a second direction that is perpendicular to the first direction;
a fifth side (128) extending between the first and second sides (116,
118) in the first direction; and
a sixth side (130) extending between the first and second sides (116,
118) in the first direction, the sixth side (130) being spaced apart from the fifth
side (128) in a third direction that is perpendicular to the first and second
directions;
the first insulating member (108) partially covers the third, fourth, fifth, and
sixth sides (122, 124, 128, 130); and
the second insulating member (110) partially covers the third, fourth, fifth,
and sixth sides (122, 124, 128, 130).
3. The sensor assembly (100) as claimed in any preceding claim,
wherein:
15
the first insulating member (108) includes a main portion (150) at least
partially covering the first side (116) of the sensor module (102) and a lip portion
(152) partially covering the third, fourth, fifth, and sixth sides (122, 124, 128, 130) of
the sensor module (102); and
the second insulating member (110) includes a main portion (154) at least
partially covering the second side (118) of the sensor module (102) and a lip portion
(156) partially covering the third, fourth, fifth, and sixth sides (122, 124, 128, 130) of
the sensor module (102).
4. The sensor assembly (100) as claimed in any preceding claim, wherein
a gap (160) is defined between the first and second insulating members (108, 110) in
the first direction.
5. The sensor assembly (100) as claimed in any preceding claim, wherein
the gap (160) is defined between a portion of the lip (152) of the first insulating
member (108) and a portion of the lip (156) of the second insulating member (110) in
the first direction.
6. The sensor assembly (100) as claimed in any preceding claim, wherein
the wire (106) extends through the gap (160).
7. The sensor assembly (100) as in any preceding claim, further
comprising:
a fastener (158) configured to couple the first insulating member (108) and the
second insulating member (110) to the sensor module (102).
8. The sensor assembly (100) as claimed in any preceding claim, wherein
the fastener (158) is spaced apart from the sensor module (102).
9. The sensor assembly (100) as claimed in any preceding claim, wherein
the sensing probe (104) is positioned outside of the first and second insulating
members (108, 110).
10. The sensor assembly (100) as claimed in any preceding claim, wherein
the sensor module (102) comprises a housing (114).
11. The sensor assembly (100) as claimed in any preceding claim, wherein
the sensor module (102) comprises a printed circuit board (148) positioned within the
housing (114).
16
12. The sensor assembly (100) as claimed in any preceding claim, wherein
the first and second insulating members (108, 110) cover at least eighty percent of and
less than ninety-five percent of a surface area of the sensor module (102).
13. The sensor assembly (100) as claimed in any preceding claim, wherein
the aftertreatment sensor (101) comprises a NOx sensor.
14. An aftertreatment system (10) for a work vehicle, the aftertreatment
system (10) comprising:
an aftertreatment device (12) configured to reduce an amount of one or more
pollutants present within an exhaust gas stream flowing therethrough;
an aftertreatment sensor including a sensor module mounted on an exterior of
the aftertreatment device, a sensing probe in contact with the exhaust gas stream, and
a wire extending from the sensor module to the sensing probe, the sensor module
including a first side and a second side spaced apart from the first side along a first
direction;
a first insulating member installed on the first side of the sensor module;
a second insulating member installed on the first side of the sensor module, the
first and second insulating members configured to protect the sensor module from
exhaust gases leaking from the aftertreatment device.