Exhaust gas sensor

Abstract

The invention relates to an exhaust gas sensor, comprising a sensor housing, a sensor element, which protrudes from the sensor housing on the exhaust gas side, and a protective tube, which is fastened to the sensor housing on the exhaust gas side and consists of an inner protective sleeve, which surrounds an exhaust gas-side end region of the sensor element, and an outer protective sleeve, which surrounds an exhaust gas-side end region of the sensor element, the outer protective sleeve surrounds the inner protective sleeve, so that an annular space is formed between the outer protective sleeve and the inner protective sleeve, and the outer protective sleeve and the inner protective sleeve are respectively provided with a gas outlet and a gas inlet. Through-flow of the protective tube takes place from the gas inlet of the outer protective sleeve into the annular space and from there through the gas inlet of the inner protective sleeve into the inner protective sleeve and from there through the gas outlets of the outer protective sleeve and the inner protective sleeve. The gas inlet of the inner protective sleeve comprises a hole row assembly composed of a plurality of holes arranged side by side in the tangential direction, gas enters the interior of the inner protective sleeve through the hole row assembly, and all the holes have the diameter larger than 1 mm and smaller than 2 mm.

Description

Technical Field

[0001] The present invention relates to an exhaust gas sensor, in particular a particulate sensor. Background Art

[0002] For example, an exhaust gas sensor is known from DE 40 34 072 A1, which includes a sleeve-shaped sensor housing, a sensor element fixed in the sensor housing, and a sleeve-shaped protective tube. The sensor element projects from the sensor housing on the exhaust gas side, and the protective tube is fastened to the sensor housing on the exhaust gas side. The protective tube consists of an inner protective sleeve and an outer protective sleeve. The inner protective sleeve surrounds the exhaust gas side end region of the sensor element, and the outer protective sleeve at least partially surrounds the inner protective sleeve, thereby forming an annular space between the outer protective sleeve and the inner protective sleeve. The outer protective sleeve and the inner protective sleeve each have a gas outlet and a gas inlet, and a gas flow is realized from the gas inlet of the outer protective sleeve into the annular space, from there through the gas inlet of the inner protective sleeve into the interior of the inner protective sleeve, and from there through the gas outlets of the outer protective sleeve and the inner protective sleeve.

[0003] Another exhaust gas sensor is known from EP 3 610 251 A1. Summary of the Invention

[0004] The exhaust gas sensor in the sense of the present invention is in particular a sensor for measuring the concentration of exhaust gas components of an internal combustion engine, such as soot, oxygen or nitrogen oxides.

[0005] According to the present invention, the exhaust gas sensor has a sleeve-shaped sensor housing, which in particular has a through-hole and thus defines in the context of the present invention in particular an axis or longitudinal axis and an axial direction. In particular, in the context of the present invention, the orientation of this axis or this axial direction is referred to as the exhaust gas side. In the context of the present invention, a step (Stufe) is introduced as a feature. Here, the side of the sensor element facing the exhaust gas can be described as being axially above this step, and the side of the sensor element facing away from the exhaust gas can be described as being axially below this step.

[0006] For example, the sleeve-shaped sensor housing can be metallic. For example, the sleeve-shaped sensor housing can have an external thread and / or an external hexagonal profile. The exhaust gas sensor can be assembled in the exhaust gas pipeline, in particular in the exhaust gas pipeline of an internal combustion engine, in this way or in another way in particular.

[0007] According to the invention, the sensor element is fixed in the sensor housing. The sensor element is in particular at least partially fixed in a through-hole of the sensor housing. For example, the sensor element can be a ceramic sensor element, for example a ceramic sensor element based on zirconia and / or alumina, which can be fixed in the through-hole of the sensor housing in particular by means of, for example, a ceramic element, in particular a sealing element.

[0008] According to the invention, the sensor element projects from the sensor housing on the exhaust gas side. Here, for example, it can be provided that the sensitive area of the sensor element, in particular the known interdigital electrode structure, is arranged on the part of the sensor element that projects from the sensor housing on the exhaust gas side. Alternatively, the sensitive area can also be an electrode of an electrochemical cell and / or an opening leading into the interior of the sensor element, for example an opening of a broadband lambda probe or a NOx sensor.

[0009] The exhaust gas sensor according to the invention has a sleeve-shaped protective tube which is fastened, for example welded, to the sensor housing on the exhaust gas side. For example, the protective tube can be welded to a flange of the sensor housing from the radial outside. For example, the protective tube can be metallic and it can be composed of, for example, a plurality of deep-drawn parts.

[0010] According to the invention, the protective tube consists of two protective sleeves, namely an inner protective sleeve and an outer protective sleeve. Optionally, the exhaust gas sensor can have a further protective sleeve which in particular interacts with the protective tube and / or the inner protective sleeve and the outer protective sleeve, for example at least partially surrounds them. Of course, a plurality of further, in particular such, protective sleeves are possible. The inner protective sleeve and the outer protective sleeve each in particular have the basic shape of a sleeve. In particular, there is at least one through-passage in the axial direction of the respective sleeve. In particular, the inner protective sleeve and the outer protective sleeve each and / or as a whole have an essentially rotationally symmetric basic shape. The sleeve-shaped housing, the inner protective sleeve and / or the outer protective sleeve, and in particular the sensor element, can for example be arranged coaxially with one another in terms of their basic structure.

[0011] The inner protective sleeve is in particular fastened, for example welded, to the sensor housing on the exhaust gas side.

[0012] According to the invention, the inner protective sleeve surrounds the exhaust gas side end region of the sensor element, for example the exhaust gas side end region of the sensor element, on which the sensitive area of the sensor element, in particular the sensitive area already described above, is arranged.

[0013] The outer protective sleeve can be fastened, for example welded, to the sensor housing on the exhaust gas side, for example welded together with the inner protective sleeve by a single circumferential weld.

[0014] The outer protective sleeve at least partially surrounds the inner protective sleeve. In particular, at least some parts of the outer protective sleeve can be arranged radially and / or axially on the exhaust gas side outside the inner protective sleeve, in particular on opposite sides when viewed from the sensor element.

[0015] However, it can also be provided that the outer protective sleeve only accommodates the part of the inner protective sleeve close to the housing inside it, while the inner protective sleeve passes through the outer protective sleeve and projects axially from the outer protective sleeve in the exhaust gas direction.

[0016] It can also be provided that the outer protective sleeve and the inner protective sleeve are arranged both radially and axially on the exhaust gas side outside the inner protective sleeve, in particular on opposite sides when viewed from the sensor element.

[0017] The exhaust gas sensor according to the invention comprises a sleeve-shaped sensor housing, a sensor element fixed in the sensor housing, and a sleeve-shaped protective tube, wherein the sensor element projects from the sensor housing on the exhaust gas side, and the protective tube is fastened to the sensor housing on the exhaust gas side, wherein the protective tube consists of an inner protective sleeve and an outer protective sleeve, wherein the inner protective sleeve surrounds the exhaust gas side end region of the sensor element, and wherein the outer protective sleeve at least partially surrounds the inner protective sleeve, so as to form an annular space between the outer protective sleeve and the inner protective sleeve. Here, the outer protective sleeve and the inner protective sleeve each have a gas outlet and a gas inlet. The gas flow through the protective tube is carried out from the gas inlet of the outer protective sleeve into the annular space, and from there through the gas inlet of the inner protective sleeve, then into the interior of the inner protective sleeve and from there through the gas outlets of the outer protective sleeve and the inner protective sleeve.

[0018] Here, the core of the invention is that the gas inlet of the inner protective sleeve comprises a row of holes assembly, which consists of a plurality of holes arranged side by side in the tangential direction, and the diameters of all these holes are greater than 1 mm and less than 2 mm.

[0019] In the present invention, it can in particular relate to a particulate sensor for determining the concentration of solid constituents in a gas, such as the soot concentration in the exhaust gas of an internal combustion engine. In particular, additional technical effects have been known in respect of particulate sensors. Therefore, the present invention is based on the following finding by the inventors: When the exhaust gas flows to the sensor element with the maximum possible volume flow, the deposition of soot particles contained in the exhaust gas on the sensor element can be particularly effectively achieved. If the diameters of all the holes are greater than 1 mm and less than 2 mm, a larger volume flow can flow through the sensor element compared with the prior art. Even if the flow rate of the exhaust gas to which the particulate sensor is subjected is low, the particulate sensor can measure very accurately.

[0020] One advantageous embodiment of the present invention is that the orifice row assembly consists of a single orifice row (a row of orifices), wherein the orifice row is composed of a plurality of orifices arranged side by side in the tangential direction. Here, the inner protective sleeve does not have other gas inlets. This is advantageous because by arranging only a single orifice row on the inner protective sleeve, the turbulence inside the inner protective sleeve is minimized, whereby the flow through the sensor element can be carried out in a targeted manner and to a large extent in a laminar flow manner. Additionally, it is advantageous that the manufacture of the protective sleeve is simplified when only a single orifice row is provided.

[0021] Another advantageous embodiment is that the orifice row assembly consists of two or more orifice rows arranged one above the other axially and extending parallel to each other, wherein each individual orifice row is composed of a plurality of orifices arranged side by side in the tangential direction. By arranging a plurality of orifice rows, the flow through the sensor element can be carried out with a larger volumetric flow rate, whereby more efficient, faster, and more accurate measurements can be performed.

[0022] One advantageous expansion of the present invention is characterized in that the individual orifices have a spacing of 1 mm to 2 mm relative to each other in the tangential direction, or are arranged at an angle of 30° to 60° relative to each other. Within the scope of the present invention, these orifice rows can also have a spacing of 2 mm to 5 mm relative to each other in the axial direction. With these values, the (exhaust gas) velocity at which the sensor element is flowed through can be optimized, and at the same time, unnecessary turbulence inside the inner protective sleeve can be minimized by these values.

[0023] One expansion of the present invention is that the inner protective sleeve has a step, wherein, when viewed in the axial direction, the inner protective sleeve has a larger diameter below the step than above the step. By arranging the step on the inner protective sleeve, more orifices can be arranged on the inner protective sleeve because the circumference of the inner protective sleeve below the step is larger than that above the step. This is advantageous because thereby better flowability of the sensor element can be achieved, which in turn enables faster and more accurate measurement of the exhaust gas concentration. Another advantage is that the flow velocity in the region above the step is increased by the narrowed cross-section above the step, which results in an accelerated discharge of the air flow from the inner protective sleeve. Here, it is expedient that the step is configured as an annular step.

[0024] One advantageous embodiment is that the step is arranged between the lower inner protective sleeve wall located axially below the step and the upper inner protective sleeve wall located axially above the step and is connected to the lower inner protective sleeve wall and the upper inner protective sleeve wall at an angle of 30° to 60° with respect to the axial direction. This is expedient because the unwanted turbulence during the flow-through can be minimized by the 30° to 60° rise. Particularly preferably, a rise of 45° can be provided.

[0025] Alternatively, a compliant destination can be set, with at least one row of holes arranged axially above the step and at least one row of holes arranged axially below the step. This is a compromise between optimizing the flow rate and minimizing the turbulence occurring inside the inner protective sleeve.

[0026] It can be set that at least one row of holes is arranged axially above the step. Thus, most of the soot particles contained in the exhaust gas stream reach the sensor element very densely and are deposited on the sensor element at a high rate, which in turn enables a more efficient measurement method.

[0027] It can also be set that at least one row of holes is arranged axially below the step. This is advantageous because the flow entering the inner protective sleeve through this row of holes arranged below the step is accelerated by the narrowing caused by this step.

[0028] An advantageous expansion of the present invention is that all rows of holes are arranged axially above the step. Here, too, it applies that most of the soot particles contained in the exhaust gas stream reach the sensor element very densely and are deposited on the sensor element at a high rate, which in turn enables a more efficient measurement method. The above-described positive effect is enhanced by the fact that all rows of holes are arranged axially above the step.

[0029] Advantageously, it can be set that all rows of holes are arranged axially below the step. As described above, this is advantageous because the flow entering the inner protective sleeve through this row of holes located below the step is accelerated by the narrowing caused by the step. The above-described positive effect is enhanced by the fact that all rows of holes are arranged axially below the step.

[0030] Here, if at least one row of holes or all rows of holes are arranged axially below the step, the radial distance to the wall of the inner protective sleeve in this axial region of the sensor element is increased. This is advantageous because it generally improves the flow through the protective tube. In addition, the cross-sectional narrowing caused by the step leads to an increase in the flow velocity inside the inner protective sleeve. This is advantageous because it increases the speed at which the sensor element is flowed through and the measurement method becomes more efficient.

[0031] It can be set, in a compliant manner, that at least one row of holes is spaced 1 mm to 2 mm from the step in the axial direction. It is also conceivable that the step is spaced 2 mm to 3 mm from the sensor element in the radial direction, and / or the step is spaced 2 mm to 3 mm from the sensor element in the axial direction. This is advantageous because it enables an optimally low-turbulence flow through the sensor element.

[0032] In a further advantageous embodiment, the gas inlet of the outer protective sleeve has at least one gas inlet opening which is provided with at least one swirl element which deflects the exhaust gas entering the annular space in such a way that the exhaust gas swirls around the inner protective sleeve in the annular space. This is advantageous because the flow rate in the protective tube can thereby be increased even at low flow velocities.

[0033] Advantageously, it can be provided that the cross section of the holes of the hole row arrangement and the cross section of the gas outlet of the inner protective sleeve form a quotient (ratio) between 0.5 and 2. Based on this quotient, the volume flow inflow or outflow through the sensor element can be determined. This is advantageous because it is thereby possible to determine the measurement time necessary to obtain an optimal measurement result.

[0034] It can be expediently provided that the diameter of the part of the inner protective sleeve facing away from the exhaust gas and located below the step and the diameter of the part of the inner protective sleeve facing the exhaust gas and located above the step form a quotient between 0.4 and 0.6. This is advantageous because the change in flow rate after the constriction of the inner protective tube can be determined based on this quotient.

[0035] Another advantageous embodiment of the solution according to the invention is that the diameter of the gas inlet of the outer protective sleeve and the diameter of the gas inlet of the inner protective sleeve form a quotient between 1 and 2. In particular, it can be provided that the quotient is greater than 1. It is known that the flow velocity of the exhaust gas flowing to the protective tube can be increased in that the gas inlet of the inner protective sleeve forms a minimum flow cross section when the protective tube is flowed through. This applies in particular when the gas inlet is arranged at the axial height of the sensor element. Due to the throttling effect of the gas inlet of the inner protective tube achieved in this way, the pressure difference between the interior of the inner protective sleeve and the annular space is maximized, which pressure difference causes the exhaust gas to accelerate significantly in the direction of the sensor element. It is therefore advantageous if the quotient is greater than 1, since the flow velocity is thereby increased at the gas inlet of the inner protective sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shown is a cross section along the longitudinal axis of an exhaust gas sensor according to the prior art.

[0037] Figure 2 A cross section along the longitudinal axis of an exhaust gas sensor according to the invention is shown, wherein two rows of holes are arranged axially above the step, wherein the step is arranged at the axial lower end of the exhaust gas sensor.

[0038] Figure 3 A cross section along the longitudinal axis of an exhaust gas sensor according to the invention is shown, wherein two rows of holes are arranged axially below the step, wherein the step is arranged at the axial upper end of the exhaust gas sensor.

[0039] Figure 4 Shows a cross-section along the longitudinal axis of an exhaust gas sensor according to the present invention, wherein a row of holes is axially arranged below the step, and the step is arranged at the axial upper end of the exhaust gas sensor.

[0040] Figure 5 Shows a cross-section along the longitudinal axis of an exhaust gas sensor according to the present invention, wherein a row of holes is axially arranged below the step and a row of holes is axially arranged above the step, and the step is arranged at the axial lower end of the exhaust gas sensor. Detailed description

[0041] Figure 1 Fundamentally shows an exhaust gas sensor, which includes a sleeve-shaped sensor housing 12, a sensor element 14 fixed in the sensor housing 12, and a sleeve-shaped protective tube 20. The sensor element projects from the sensor housing 12 on the exhaust gas side, and the protective tube is fastened to the sensor housing 12 on the exhaust gas side. Here, the protective tube 20 is composed of an inner protective sleeve 21 and an outer protective sleeve 22. The inner protective sleeve 19 surrounds the exhaust gas side end region 141 of the sensor element 14, and the outer protective sleeve 22 at least partially surrounds the inner protective sleeve 21, so that an annular space 9 is formed between the outer protective sleeve 22 and the inner protective sleeve 21. The outer protective sleeve 22 and the inner protective sleeve 21 respectively have a gas outlet and a gas inlet. The flow through the protective tube 20 is carried out from the gas inlet of the outer protective sleeve 22 into the annular space 9, from there through the gas inlet of the inner protective sleeve 21 and from there into the interior of the inner protective sleeve 21 and from there through the gas outlets of the outer protective sleeve 21 and the inner protective sleeve 22.

[0042] For an embodiment of the present invention, only the modified protective sleeve 21 is shown in Figures 2 to 5 For these exhaust gas sensors, reference can be made to the Figure 1 fundamental description.

[0043] Figure 2 Shows an exhaust gas sensor 1 according to the present invention, wherein the gas inlet of the inner protective sleeve 21 includes a row of hole assemblies 3 composed of a plurality of holes 2 arranged side by side in the tangential direction, and the diameters of all the holes 2 are greater than 1 mm and less than 2 mm. Figure 2 It is also shown that the row of hole assemblies 3 includes two rows of holes 4, which are axially arranged above the step 5, and the step 5 is arranged at the axial lower end of the exhaust gas sensor 1.

[0044] Figure 3shows a cross-section along the longitudinal axis of an exhaust gas sensor according to the present invention, wherein two rows of holes 4 are arranged axially below the step 5, and the step 5 is arranged at the upper axial end of the exhaust gas sensor 1. In this case, all rows of holes 4 are arranged axially below the step 5, and it is also possible that more than two rows of holes 4 are arranged below the step 5. It is also conceivable that, as shown in Figure 4 only one row of holes 4 is arranged axially below the step 5.

[0045] Figure 5 shows a cross-section along the longitudinal axis of the exhaust gas sensor 1 according to the present invention, wherein one row of holes 4 is arranged axially below the step 5 and one row of holes 4 is arranged axially above the step 5, and the step 5 is arranged at the lower axial end of the exhaust gas sensor 1.

[0046] Depending on the embodiment of the present invention, the step 5 can be arranged centrally at the upper or lower axial end of the exhaust gas sensor 1. It is conceivable that the step 5 is arranged between the lower inner protective sleeve wall 6 located axially below the step 5 and the upper inner protective sleeve wall 7 located axially above the step, and is connected to the lower inner protective sleeve wall and the upper inner protective sleeve wall at an angle of 30° to 60° with the axial direction. Therefore, if the step 5 is connected to the lower inner protective sleeve wall 6 and the upper inner protective sleeve wall 7 at an angle different from that shown in Figures 2 to 5 , this does not deviate from the scope of the present invention.

[0047] As shown in Figure 4 , the row of holes assembly 3 can consist of only one row of holes 4, and the row of holes 4 is composed of a plurality of holes 2 arranged side by side in the tangential direction.

[0048] Alternatively, it is also conceivable that the row of holes assembly 3 consists of two or more rows of holes 4 arranged one above the other (in the plane of the drawing) axially and extending parallel to each other, and each individual row of holes 4 is composed of a plurality of holes 2 arranged side by side in the tangential direction (see Figure 2 , Figure 3 and Figure 5 ).

[0049] As shown in Figures 2 to 5 , the inner protective sleeve 21 has a step 5, and when observed in the axial direction, the inner protective sleeve 21 has a larger diameter below the step 5 than above the step 5.

[0050] As shown in Figure 2 , one row of holes 4 can be arranged axially above the step 5. Here, it is also conceivable that all rows of holes 4 are arranged axially above the step 5. Therefore, it is conceivable that two, three or more rows of holes 4 are arranged axially above the step 5.

[0051] As Figures 2 to 5 shown, the step 5 is always spaced apart from the sensor element 14 by at least 1 mm in the radial direction. Here, the step 5 is always spaced apart from the exhaust gas side end of the sensor element 14 by at least 1 mm in the axial direction. It is also visible that at least one row of holes 4 is spaced apart from the step 5 by at least 1 mm in the axial direction.

[0052] In Figures 2 to 5 it is also visible that the gas inlet of the outer protective sleeve 22 has at least one gas inlet opening which is provided with at least one swirl element 8, so that the exhaust gas entering the annular space 9 is deflected, causing it to rotate around the inner protective sleeve 21 within the annular space 9.

Claims

1. An exhaust gas sensor comprising a sleeve-shaped sensor housing (12), a sensor element (14) fixed in the sensor housing (12), and a sleeve-shaped protective tube (20), wherein the sensor element protrudes from the sensor housing (12) on the exhaust gas side, and the protective tube is fastened to the sensor housing (12) on the exhaust gas side, wherein: The protective tube (20) is composed of an inner protective sleeve (21) and an outer protective sleeve (22), wherein the inner protective sleeve (21) surrounds the exhaust gas-side end region (141) of the sensor element (14), wherein the outer protective sleeve (22) at least partially surrounds the inner protective sleeve (21), thereby forming an annular space (9) between the outer protective sleeve (22) and the inner protective sleeve (21), wherein the outer protective sleeve (22) and the inner protective sleeve (21) respectively have a gas outlet and a gas inlet, and the protective tube (20) The throughflow takes place from the gas inlet of the outer protective sleeve (22) into the annular space (9), from there through the gas inlet of the inner protective sleeve (21) into the interior of the inner protective sleeve and from there through the gas outlet of the outer protective sleeve (22) and the gas outlet of the inner protective sleeve (21), characterized in that the gas inlet of the inner protective sleeve (21) comprises a hole row assembly (3), which consists of a plurality of holes (2) arranged side by side in the tangential direction, wherein all of the holes (2) have a diameter greater than 1 mm and less than 2 mm.

2. The exhaust gas sensor according to claim 1, characterized in that: The hole row assembly (3) is composed of a single hole row (4), wherein the hole row (4) is composed of a plurality of holes (2) arranged side by side in a tangential direction.

3. The exhaust gas sensor according to claim 1, characterized in that: The hole row assembly (3) is composed of two or more hole rows (4) arranged one above the other in the axial direction and extending parallel to each other, wherein each single hole row (4) is composed of a plurality of holes (2) arranged side by side in the tangential direction, and all of the holes have a diameter greater than 1 mm and less than 2 mm.

4. The exhaust gas sensor according to claim 3, characterized in that: The rows of holes (4) have a spacing of 2 mm to 5 mm relative to one another in the axial direction.

5. The exhaust gas sensor according to claim 1, characterized in that The individual holes (2) of a hole row (4) have a spacing of 1 mm to 2 mm relative to one another in the tangential direction.

6. The exhaust gas sensor according to claim 1, characterized in that The inner protective sleeve (21) has a step (5), wherein, viewed in the axial direction, the inner protective sleeve (21) has a larger diameter on a side of the step (5) facing away from the exhaust gas than on a side of the step (5) facing toward the exhaust gas.

7. The exhaust gas sensor according to claim 6, characterized in that The step (5) is arranged between a lower inner protective sleeve wall (6) located on the side facing away from the exhaust gas and an upper inner protective sleeve wall (7) located on the side facing the exhaust gas, and is connected to the lower inner protective sleeve wall and the upper inner protective sleeve wall at an angle of 30° to 60° to the axial direction.

8. The exhaust gas sensor according to claim 6 or 7, characterized in that: At least one row of holes (4) is arranged above the step (5) on the side facing the exhaust gas, and at least one row of holes (4) is arranged below the step (5) on the side facing away from the exhaust gas.

9. The exhaust gas sensor according to claim 6 or 7, characterized in that: At least one row of holes (4) is arranged above the step (5) on the side facing the exhaust gas.

10. The exhaust gas sensor according to claim 6 or 7, characterized in that: At least one row of holes (4) is arranged below the step (5) on the side facing away from the exhaust gas.

11. The exhaust gas sensor according to claim 6 or 7, characterized in that: All rows of holes (4) are arranged above the step (5) on the side facing the exhaust gas.

12. The exhaust gas sensor according to claim 6 or 7, characterized in that: All rows of holes (4) are arranged below the step (5) on the side facing away from the exhaust gas.

13. The exhaust gas sensor according to any one of claims 6 to 12, characterized in that At least one row of holes (4) is spaced apart from the step (5) by 1 mm to 2 mm in the axial direction.

14. The exhaust gas sensor according to any one of claims 6 to 13, characterized in that The step (5) is always spaced apart from the sensor element (14) in the radial direction by at least 2 to 3 mm and / or the step (5) is always spaced apart from the exhaust gas-side end of the sensor element (14) in the axial direction by at least 5 mm.

15. The exhaust gas sensor according to claim 1, characterized in that The gas inlet of the outer protective sleeve (22) has at least one gas inlet opening, and the gas inlet opening is provided with at least one vortex element (8) which deflects the exhaust gas entering the annular space (9) so that the exhaust gas rotates around the inner protective sleeve (21) in the annular space (9).

16. The exhaust gas sensor according to claim 1, characterized in that The cross-section of the hole (2) of the hole array assembly (3) and the cross-section of the gas outlet of the inner protective sleeve (21) form the following quotient, which is 0.5 to 2.

17. The exhaust gas sensor according to claim 1, characterized in that The diameter of a portion of the inner protective sleeve (21) facing away from the exhaust gas and located below the step (5) and the diameter of a portion of the inner protective sleeve (21) facing the exhaust gas and located above the step (5) form a quotient of 0.4 to 0.

6.

18. The exhaust gas sensor according to claim 1, characterized in that The diameter of the gas inlet of the outer protective sleeve (22) and the diameter of the gas inlet of the inner protective sleeve (21) form the following quotient, and the quotient is 1 to 2.

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