WO2011129295A1 - Exhaust sensor - Google Patents
Exhaust sensor Download PDFInfo
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- WO2011129295A1 WO2011129295A1 PCT/JP2011/058993 JP2011058993W WO2011129295A1 WO 2011129295 A1 WO2011129295 A1 WO 2011129295A1 JP 2011058993 W JP2011058993 W JP 2011058993W WO 2011129295 A1 WO2011129295 A1 WO 2011129295A1
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- exhaust
- sensor
- gas
- sensor body
- exhaust gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
Definitions
- the present invention relates to an exhaust sensor for measuring an exhaust gas component.
- the exhaust sensor is disposed, for example, on the exhaust gas downstream side of the exhaust gas aftertreatment device in the exhaust pipe of the engine and measures the exhaust gas component.
- an exhaust gas aftertreatment device for example, there is a DPF (diesel particulate filter) that collects PM (particulate matter) contained in exhaust gas.
- PM (particulate matter) emission amount There is a PM sensor that detects
- the exhaust sensor when the exhaust sensor is attached to the exhaust pipe of the engine in order to take the exhaust gas into the exhaust sensor (sensing part), exhaust the exhaust sensor so that the exhaust sensor (sensor body) is orthogonal to the exhaust gas flow. It is desirable to insert into the tube from the outside. In this case, if there is no appropriate pressure difference between the gas inlet and the gas outlet formed in the sensor body exposed in the exhaust pipe, the exhaust gas stays inside the sensor body, and the combustion products in the exhaust gas (soot, Carbide, sulfur oxide, etc.) may adhere to the inside of the sensor body, and the function of the exhaust sensor may be impaired.
- an object of the present invention is to suppress the stagnation of exhaust gas inside the sensor body by generating an appropriate pressure difference between the gas inlet and the gas outlet formed in the sensor body.
- the present invention provides an exhaust sensor for measuring an exhaust gas component, a cylindrical sensor body inserted into an exhaust pipe of an engine, and facing the exhaust gas upstream of the sensor body.
- the area of the gas outlet may be larger than the area of the gas inlet.
- a liquid discharge hole communicating with the inside of the sensor body may be provided at the lower end of the sensor body.
- the gas inlet may be formed at one end of the sensor body, and the gas outlet may be formed at the other end of the sensor body.
- the sensor body may be inserted into the exhaust pipe so that the longitudinal direction of the sensor body is orthogonal to the longitudinal direction of the exhaust pipe.
- a turbine may be disposed in the exhaust pipe, and the sensor main body may be inserted in the exhaust pipe downstream of the turbine.
- An exhaust gas aftertreatment device may be disposed in the exhaust pipe downstream of the exhaust gas from the turbine, and the sensor main body may be inserted into the exhaust pipe downstream of the exhaust gas aftertreatment device.
- FIG. 1 is a schematic view of an engine equipped with an exhaust sensor according to an embodiment of the present invention.
- FIG. 2 is an enlarged view of a main part of FIG.
- FIG. 3 is an enlarged view of a main part of an engine to which an exhaust sensor according to another embodiment is mounted.
- 1 is an engine (in this embodiment, a diesel engine), 2 is an intake pipe connected to the intake port 1a of the engine 1, 3 is an air cleaner disposed in the intake pipe 2, and 4 is an air cleaner 3.
- a turbo compressor turbocharger compressor
- 5 is an exhaust pipe (tail pipe) connected to the exhaust port 1 b of the engine 1
- Reference numeral 6 denotes a turbine that is disposed in the exhaust pipe 5 and drives the turbo compressor 4
- 7 is an exhaust gas aftertreatment device that is disposed in the exhaust pipe 5 on the downstream side of the exhaust gas from the turbine 6.
- the exhaust gas aftertreatment device 7 includes, for example, a DPF (diesel particulate filter) that collects PM (particulate matter) contained in the exhaust gas.
- DPF diesel particulate filter
- the exhaust sensor 10 of the present embodiment is a vehicle-mounted sensor that assumes OBD (On-board diagnostics), and charges the supplied air with a charge. It is a PM sensor that detects the amount of discharge.
- OBD On-board diagnostics
- the exhaust sensor 10 of the present embodiment includes a cylindrical (bottomed or sheathed) sensor body 11 that is inserted into the exhaust pipe 5 of the engine 1, and one end of the sensor body 11.
- a cover 15 that closes the other end side of the sensor body 11.
- the exhaust sensor 10 is inserted into the exhaust pipe 5 from outside and above so that the sensor body 11 is orthogonal to the exhaust gas flow inside the exhaust pipe 5. That is, in the present embodiment, the exhaust sensor 10 is inserted into the exhaust pipe 5 from the outside and above so that the longitudinal direction of the sensor body 11 is orthogonal to the longitudinal direction of the exhaust pipe 5.
- the senor body 11 and the nozzle 14 are arranged concentrically with each other. Further, although not shown, an air compressor is connected to the base end of the nozzle 14, and air is supplied to the nozzle 14 by this air compressor.
- the gas inlet 12 is directed to the upstream side of the exhaust pipe 5 (exhaust gas upstream side) and the gas outlet 13 is directed to the exhaust pipe 5 with respect to the exhaust gas flow inside the exhaust pipe 5. It has a structure oriented toward the downstream side (downstream side of the exhaust gas). That is, the gas inlet 12 faces the upstream side of the exhaust gas and opens in the sensor body 11, and the gas outlet 13 faces the downstream side of the exhaust gas and opens in the sensor body 11. Are arranged at intervals in the circumferential direction of the sensor body 11.
- the area of the gas outlet 13 is larger than the area of the gas inlet 12.
- each of the gas outlet 13 and the gas inlet 12 includes a plurality of holes 13 a and 12 a having the same area, and the number of holes 13 a constituting the gas outlet 13 (five in the illustrated example) configures the gas inlet 12. More than the number of holes 12a to be formed (three in the illustrated example).
- a cylindrical sensor main body 11 inserted into the exhaust pipe 5 of the engine 1, a gas inlet 12 opened to the sensor main body 11 facing the exhaust gas upstream side, and an exhaust gas downstream side of the sensor main body 11.
- the exhaust gas sensor 13 is provided with a gas outlet 13 that is open to face the exhaust gas flow, and the gas inlet 12 is upstream of the exhaust pipe 5 (exhaust gas upstream side) with respect to the exhaust gas flow inside the exhaust pipe 5. Since the gas outlet 13 is directed to the exhaust pipe 5 downstream side (exhaust gas downstream side), it is easy to generate a pressure difference between the gas inlet 12 and the gas outlet 13, and the exhaust gas is inside the sensor body 11. Can flow smoothly, and the retention of exhaust gas in the sensor body 11 can be suppressed.
- the exhaust gas flow inside the sensor body 11 is smooth, efficient sensing by the exhaust sensor 10 is possible. Furthermore, since the exhaust gas stays inside the sensor body 11 can be suppressed, it is possible to prevent the exhaust sensor 10 from being deteriorated by the exhaust gas.
- the area of the gas outlet 13 is made larger than the area of the gas inlet 12, a pressure difference can be more easily generated between the gas inlet 12 and the gas outlet 13, and the inside of the sensor body 11 is increased. It is possible to introduce exhaust gas more efficiently into the vehicle.
- a liquid discharge communicating with the inside of the sensor main body 11 is provided at the lower end of the sensor main body 11 so that liquid such as condensed water generated in the sensor main body 11 after the engine 1 is stopped can be discharged by gravity.
- a hole 16 may be provided. In the illustrated example, the liquid discharge hole 16 is provided at the tip (lower end) of the sensor body 11, but the position of the liquid discharge hole 16 is appropriate depending on the mounting angle of the exhaust sensor 10 (sensor body 11) with respect to the exhaust pipe 5. Shall be set to
- the exhaust sensor 10 is not limited to a PM sensor, and may be a sensor that measures exhaust gas components other than PM.
Abstract
The retention of exhaust gas in the inner parts of a sensor body is curbed by generating an appropriate pressure difference between a gas inlet and a gas outlet formed on the body of the sensor. The exhaust sensor (10), which measures exhaust gas composition, is equipped with a cylindrical sensor body (11) that is inserted into an exhaust pipe (5) of an engine (1), a gas inlet (12) that opens into the sensor body (11) and faces upstream and a gas outlet (13) that opens into the sensor body (11) and faces downstream. Due to the pressure difference between the gas inlet (12) and the gas outlet (13), exhaust gas, after being captured in the inner part of the sensor body (11) from the gas inlet (12), is expelled from the gas outlet (13).
Description
本発明は、排気ガス成分の測定を行う排気センサーに関する。
The present invention relates to an exhaust sensor for measuring an exhaust gas component.
排気センサーは、例えば、エンジンの排気管における排ガス後処理装置の排気ガス下流側に配設され、排気ガス成分の測定を行うものである。排ガス後処理装置としては、例えば、排気ガス中に含まれるＰＭ（粒子状物質）を捕集するＤＰＦ（ディーゼルパティキュレートフィルタ）があり、排気センサーとしては、例えば、ＰＭ（粒子状物質）排出量を検知するＰＭセンサーがある。
The exhaust sensor is disposed, for example, on the exhaust gas downstream side of the exhaust gas aftertreatment device in the exhaust pipe of the engine and measures the exhaust gas component. As an exhaust gas aftertreatment device, for example, there is a DPF (diesel particulate filter) that collects PM (particulate matter) contained in exhaust gas. As an exhaust sensor, for example, PM (particulate matter) emission amount There is a PM sensor that detects
ところで、排気ガスを排気センサー内部（センシング部）に取り込むために、排気センサーをエンジンの排気管に取り付ける場合、排気センサー（センサー本体）が排気ガス流れに対して直交するように、排気センサーを排気管に外側から挿入することが望ましい。この場合、排気管内に露出するセンサー本体に形成されるガス入口とガス出口との間に適切な圧力差がないとセンサー本体内部に排気ガスが滞留し、排気ガス中の燃焼生成物（煤、炭化物、硫黄酸化物等）がセンサー本体内部に付着し、排気センサーの機能が損なわれる虞がある。
By the way, when the exhaust sensor is attached to the exhaust pipe of the engine in order to take the exhaust gas into the exhaust sensor (sensing part), exhaust the exhaust sensor so that the exhaust sensor (sensor body) is orthogonal to the exhaust gas flow. It is desirable to insert into the tube from the outside. In this case, if there is no appropriate pressure difference between the gas inlet and the gas outlet formed in the sensor body exposed in the exhaust pipe, the exhaust gas stays inside the sensor body, and the combustion products in the exhaust gas (soot, Carbide, sulfur oxide, etc.) may adhere to the inside of the sensor body, and the function of the exhaust sensor may be impaired.
例えば、排気管内に露出するセンサー本体の同一周上にガス出口とガス入口とを設けていると、ガス入口とガス出口との間に圧力差が発生しにくい。
For example, if a gas outlet and a gas inlet are provided on the same circumference of the sensor body exposed in the exhaust pipe, a pressure difference is unlikely to occur between the gas inlet and the gas outlet.
そこで、本発明の目的は、センサー本体に形成されるガス入口とガス出口との間に適切な圧力差を発生させることにより、センサー本体内部での排気ガスの滞留を抑制することにある。
Therefore, an object of the present invention is to suppress the stagnation of exhaust gas inside the sensor body by generating an appropriate pressure difference between the gas inlet and the gas outlet formed in the sensor body.
上述の目的を達成するために、本発明は、排気ガス成分の測定を行う排気センサーにおいて、エンジンの排気管に挿入される筒状のセンサー本体と、該センサー本体に排気ガス上流側に臨んで開口されたガス入口と、前記センサー本体に排気ガス下流側に臨んで開口されたガス出口とを備え、前記ガス入口と前記ガス出口との圧力差により、排気ガスが前記ガス入口から前記センサー本体内部に取り込まれた後に前記ガス出口から排出されるようにしたものである。
In order to achieve the above-described object, the present invention provides an exhaust sensor for measuring an exhaust gas component, a cylindrical sensor body inserted into an exhaust pipe of an engine, and facing the exhaust gas upstream of the sensor body. An open gas inlet, and a gas outlet that opens toward the exhaust gas downstream of the sensor main body, and exhaust gas flows from the gas inlet to the sensor main body due to a pressure difference between the gas inlet and the gas outlet. After being taken in, it is discharged from the gas outlet.
前記ガス出口の面積を前記ガス入口の面積よりも大きくしても良い。
The area of the gas outlet may be larger than the area of the gas inlet.
前記センサー本体の下端部に前記センサー本体内部に連通する液体排出孔を設けても良い。
A liquid discharge hole communicating with the inside of the sensor body may be provided at the lower end of the sensor body.
前記ガス入口が前記センサー本体の一端部に形成され、前記ガス出口が前記センサー本体の他端部に形成されていても良い。
The gas inlet may be formed at one end of the sensor body, and the gas outlet may be formed at the other end of the sensor body.
前記センサー本体の長手方向が前記排気管の長手方向に対して直交するように、前記センサー本体が前記排気管に挿入されていても良い。
The sensor body may be inserted into the exhaust pipe so that the longitudinal direction of the sensor body is orthogonal to the longitudinal direction of the exhaust pipe.
前記排気管にタービンが配設され、該タービンよりも排気ガス下流側の前記排気管に前記センサー本体が挿入されていても良い。
A turbine may be disposed in the exhaust pipe, and the sensor main body may be inserted in the exhaust pipe downstream of the turbine.
前記タービンよりも排気ガス下流側の前記排気管に排ガス後処理装置が配設され、該排ガス後処理装置よりも排気ガス下流側の前記排気管に前記センサー本体が挿入されていても良い。
An exhaust gas aftertreatment device may be disposed in the exhaust pipe downstream of the exhaust gas from the turbine, and the sensor main body may be inserted into the exhaust pipe downstream of the exhaust gas aftertreatment device.
本発明によれば、センサー本体に形成されるガス入口とガス出口との間に適切な圧力差を発生させることにより、センサー本体内部での排気ガスの滞留を抑制することができるという優れた効果を奏する。
According to the present invention, by generating an appropriate pressure difference between the gas inlet and the gas outlet formed in the sensor body, it is possible to suppress the retention of exhaust gas inside the sensor body. Play.
以下、本発明の好適な実施形態を添付図面に基づいて詳述する。
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
図１中、１はエンジン（本実施形態では、ディーゼルエンジン）、２はエンジン１の吸気ポート１ａに接続された吸気管、３は吸気管２に配設されたエアクリーナー、４はエアクリーナー３よりも吸気下流側の吸気管２に配設されエンジン１に供給する吸気を昇圧するターボコンプレッサー（ターボチャージャーのコンプレッサー）、５はエンジン１の排気ポート１ｂに接続された排気管（テールパイプ）、６は排気管５に配設されターボコンプレッサー４を駆動するタービン、７はタービン６よりも排気ガス下流側の排気管５に配設された排ガス後処理装置である。排ガス後処理装置７は、例えば、排気ガス中に含まれるＰＭ（粒子状物質）を捕集するＤＰＦ（ディーゼルパティキュレートフィルタ）を有する。
In FIG. 1, 1 is an engine (in this embodiment, a diesel engine), 2 is an intake pipe connected to the intake port 1a of the engine 1, 3 is an air cleaner disposed in the intake pipe 2, and 4 is an air cleaner 3. A turbo compressor (turbocharger compressor) disposed in the intake pipe 2 on the downstream side of the intake air to boost the intake air supplied to the engine 1, 5 is an exhaust pipe (tail pipe) connected to the exhaust port 1 b of the engine 1, Reference numeral 6 denotes a turbine that is disposed in the exhaust pipe 5 and drives the turbo compressor 4, and 7 is an exhaust gas aftertreatment device that is disposed in the exhaust pipe 5 on the downstream side of the exhaust gas from the turbine 6. The exhaust gas aftertreatment device 7 includes, for example, a DPF (diesel particulate filter) that collects PM (particulate matter) contained in the exhaust gas.
本実施形態の排気センサー１０は、ＯＢＤ（On-board diagnostics；自己故障診断）対応を想定した車載可能なセンサーであって、供給されるエアーに電荷をチャージし、電荷の変化量からＰＭ（粒子状物質）排出量を検知するＰＭセンサーである。
The exhaust sensor 10 of the present embodiment is a vehicle-mounted sensor that assumes OBD (On-board diagnostics), and charges the supplied air with a charge. It is a PM sensor that detects the amount of discharge.
図２に示すように、本実施形態の排気センサー１０は、エンジン１の排気管５に挿入される筒状（有底筒状或いは鞘状）のセンサー本体１１と、センサー本体１１の一端部に形成されたガス入口１２と、センサー本体１１の他端部に形成されたガス出口１３と、センサー本体１１内部に収容され先端からエアーを噴出するノズル１４と、エアーに電荷をチャージする電極（図示せず）と、センサー本体１１の他端部側を閉塞するカバー１５とを備えている。
As shown in FIG. 2, the exhaust sensor 10 of the present embodiment includes a cylindrical (bottomed or sheathed) sensor body 11 that is inserted into the exhaust pipe 5 of the engine 1, and one end of the sensor body 11. The formed gas inlet 12, the gas outlet 13 formed at the other end of the sensor body 11, the nozzle 14 accommodated in the sensor body 11 and ejecting air from the tip, and the electrode for charging the air (see FIG. And a cover 15 that closes the other end side of the sensor body 11.
本実施形態では、センサー本体１１が排気管５内部の排気ガス流れに対して直交するように、排気センサー１０が排気管５に外側且つ上方から挿入されている。つまり、本実施形態では、センサー本体１１の長手方向が排気管５の長手方向に対して直交するように、排気センサー１０が排気管５に外側且つ上方から挿入されている。
In this embodiment, the exhaust sensor 10 is inserted into the exhaust pipe 5 from outside and above so that the sensor body 11 is orthogonal to the exhaust gas flow inside the exhaust pipe 5. That is, in the present embodiment, the exhaust sensor 10 is inserted into the exhaust pipe 5 from the outside and above so that the longitudinal direction of the sensor body 11 is orthogonal to the longitudinal direction of the exhaust pipe 5.
また、本実施形態では、センサー本体１１とノズル１４とは、互いに同心的に配置されている。さらに、図示はしないが、ノズル１４の基端にはエアーコンプレッサーが接続されており、このエアコンプレッサーによってエアーがノズル１４に供給されるようになっている。
In the present embodiment, the sensor body 11 and the nozzle 14 are arranged concentrically with each other. Further, although not shown, an air compressor is connected to the base end of the nozzle 14, and air is supplied to the nozzle 14 by this air compressor.
また、本実施形態に係る排気センサー１０は、排気管５内部の排気ガス流れに対して、ガス入口１２が排気管５上流側（排気ガス上流側）へ指向し、ガス出口１３が排気管５下流側（排気ガス下流側）へ指向した構造を有している。つまり、ガス入口１２は排気ガス上流側に臨んでセンサー本体１１に開口されていると共に、ガス出口１３は排気ガス下流側に臨んでセンサー本体１１に開口されており、ガス入口１２とガス出口１３とはセンサー本体１１の周方向に間隔を隔てて配置されている。
Further, in the exhaust sensor 10 according to the present embodiment, the gas inlet 12 is directed to the upstream side of the exhaust pipe 5 (exhaust gas upstream side) and the gas outlet 13 is directed to the exhaust pipe 5 with respect to the exhaust gas flow inside the exhaust pipe 5. It has a structure oriented toward the downstream side (downstream side of the exhaust gas). That is, the gas inlet 12 faces the upstream side of the exhaust gas and opens in the sensor body 11, and the gas outlet 13 faces the downstream side of the exhaust gas and opens in the sensor body 11. Are arranged at intervals in the circumferential direction of the sensor body 11.
本実施形態では、ガス出口１３の面積をガス入口１２の面積よりも大きくしている。図示例では、ガス出口１３及びガス入口１２はそれぞれ、複数の同一面積の孔１３ａ、１２ａからなり、ガス出口１３を構成する孔１３ａの数（図示例では、５個）がガス入口１２を構成する孔１２ａの数（図示例では、３個）よりも多くなるようにしている。
In this embodiment, the area of the gas outlet 13 is larger than the area of the gas inlet 12. In the illustrated example, each of the gas outlet 13 and the gas inlet 12 includes a plurality of holes 13 a and 12 a having the same area, and the number of holes 13 a constituting the gas outlet 13 (five in the illustrated example) configures the gas inlet 12. More than the number of holes 12a to be formed (three in the illustrated example).
本実施形態の作用を説明する。
The operation of this embodiment will be described.
本実施形態では、エンジン１の排気管５に挿入される筒状のセンサー本体１１と、センサー本体１１に排気ガス上流側に臨んで開口されたガス入口１２と、センサー本体１１に排気ガス下流側に臨んで開口されたガス出口１３とを備えて排気センサー１０を構成しており、排気管５内部の排気ガス流れに対して、ガス入口１２が排気管５上流側（排気ガス上流側）へ指向し、ガス出口１３が排気管５下流側（排気ガス下流側）へ指向しているので、ガス入口１２とガス出口１３との間に圧力差を発生させやすく、排気ガスがセンサー本体１１内部をスムースに流れるようにすることができ、センサー本体１１内部での排気ガスの滞留を抑制することができる。また、センサー本体１１内部の排気ガス流れがスムースなので、排気センサー１０による効率的なセンシングが可能となる。さらに、センサー本体１１内部での排気ガスの滞留を抑制できるので、排気ガスによる排気センサー１０の劣化を防止することができる。
In the present embodiment, a cylindrical sensor main body 11 inserted into the exhaust pipe 5 of the engine 1, a gas inlet 12 opened to the sensor main body 11 facing the exhaust gas upstream side, and an exhaust gas downstream side of the sensor main body 11. The exhaust gas sensor 13 is provided with a gas outlet 13 that is open to face the exhaust gas flow, and the gas inlet 12 is upstream of the exhaust pipe 5 (exhaust gas upstream side) with respect to the exhaust gas flow inside the exhaust pipe 5. Since the gas outlet 13 is directed to the exhaust pipe 5 downstream side (exhaust gas downstream side), it is easy to generate a pressure difference between the gas inlet 12 and the gas outlet 13, and the exhaust gas is inside the sensor body 11. Can flow smoothly, and the retention of exhaust gas in the sensor body 11 can be suppressed. Further, since the exhaust gas flow inside the sensor body 11 is smooth, efficient sensing by the exhaust sensor 10 is possible. Furthermore, since the exhaust gas stays inside the sensor body 11 can be suppressed, it is possible to prevent the exhaust sensor 10 from being deteriorated by the exhaust gas.
また、本実施形態によれば、ガス出口１３の面積をガス入口１２の面積よりも大きくしたので、ガス入口１２とガス出口１３との間に圧力差をより発生しやすくでき、センサー本体１１内部へのより効率的な排気ガスの導入が可能となる。
Further, according to the present embodiment, since the area of the gas outlet 13 is made larger than the area of the gas inlet 12, a pressure difference can be more easily generated between the gas inlet 12 and the gas outlet 13, and the inside of the sensor body 11 is increased. It is possible to introduce exhaust gas more efficiently into the vehicle.
ところで、排気ガスを排気センサー１０内部に取り込むために、排気センサー１０をエンジン１の排気管５に取り付ける場合、エンジン１停止後にセンサー本体１１内部の温度が低下し露点を下回ると、排気ガス中の燃焼生成物（水、硫黄酸化物等）が凝縮水となって、センサー本体１１内部に溜まり、排気センサー１０の機能を損なう虞がある。そこで、図３に示すように、センサー本体１１の下端部に、エンジン１停止後にセンサー本体１１内部に発生する凝縮水等の液体を重力で排出できるように、センサー本体１１内部に連通する液体排出孔１６を設けると良い。図示例では、センサー本体１１の先端（下端）に液体排出孔１６を設けているが、排気管５に対する排気センサー１０（センサー本体１１）の取り付け角度に応じて、液体排出孔１６の位置は適切に設定されるものとする。
By the way, when the exhaust sensor 10 is attached to the exhaust pipe 5 of the engine 1 in order to take the exhaust gas into the exhaust sensor 10, if the temperature inside the sensor body 11 decreases after the engine 1 stops and falls below the dew point, Combustion products (water, sulfur oxides, etc.) become condensed water and accumulate in the sensor body 11, which may impair the function of the exhaust sensor 10. Therefore, as shown in FIG. 3, a liquid discharge communicating with the inside of the sensor main body 11 is provided at the lower end of the sensor main body 11 so that liquid such as condensed water generated in the sensor main body 11 after the engine 1 is stopped can be discharged by gravity. A hole 16 may be provided. In the illustrated example, the liquid discharge hole 16 is provided at the tip (lower end) of the sensor body 11, but the position of the liquid discharge hole 16 is appropriate depending on the mounting angle of the exhaust sensor 10 (sensor body 11) with respect to the exhaust pipe 5. Shall be set to
以上、本発明の好適な実施形態について説明したが、本発明は上述の実施形態には限定されず他の様々な実施形態を採ることが可能である。
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various other embodiments can be adopted.
例えば、排気センサー１０は、ＰＭセンサーに限定はされず、ＰＭ以外の排気ガス成分を測定するセンサーであっても良い。
For example, the exhaust sensor 10 is not limited to a PM sensor, and may be a sensor that measures exhaust gas components other than PM.
１ エンジン
２ 吸気管
３ エアクリーナー
４ ターボコンプレッサー
５ 排気管（テールパイプ）
６ タービン
７ 排ガス後処理装置
１０ 排気センサー
１１ センサー本体
１２ ガス入口
１３ ガス出口
１６ 液体排出孔 1Engine 2 Intake pipe 3 Air cleaner 4 Turbo compressor 5 Exhaust pipe (tail pipe)
6Turbine 7 Exhaust gas aftertreatment device 10 Exhaust sensor 11 Sensor body 12 Gas inlet 13 Gas outlet 16 Liquid discharge hole
２ 吸気管
３ エアクリーナー
４ ターボコンプレッサー
５ 排気管（テールパイプ）
６ タービン
７ 排ガス後処理装置
１０ 排気センサー
１１ センサー本体
１２ ガス入口
１３ ガス出口
１６ 液体排出孔 1
6
Claims (7)
- 排気ガス成分の測定を行う排気センサーにおいて、
エンジンの排気管に挿入される筒状のセンサー本体と、該センサー本体に排気ガス上流側に臨んで開口されたガス入口と、前記センサー本体に排気ガス下流側に臨んで開口されたガス出口とを備え、
前記ガス入口と前記ガス出口との圧力差により、排気ガスが前記ガス入口から前記センサー本体内部に取り込まれた後に前記ガス出口から排出されるようにしたことを特徴とする排気センサー。 In exhaust sensors that measure exhaust gas components,
A cylindrical sensor body that is inserted into the exhaust pipe of the engine, a gas inlet that opens to the sensor body facing the exhaust gas upstream side, and a gas outlet that opens to the sensor body facing the exhaust gas downstream side; With
An exhaust sensor according to claim 1, wherein exhaust gas is discharged from the gas outlet after being taken into the sensor body from the gas inlet due to a pressure difference between the gas inlet and the gas outlet. - 前記ガス出口の面積を前記ガス入口の面積よりも大きくした請求項１に記載の排気センサー。 The exhaust sensor according to claim 1, wherein an area of the gas outlet is larger than an area of the gas inlet.
- 前記センサー本体の下端部に前記センサー本体内部に連通する液体排出孔を設けた請求項１又は２に記載の排気センサー。 The exhaust sensor according to claim 1 or 2, wherein a liquid discharge hole communicating with the inside of the sensor body is provided at a lower end portion of the sensor body.
- 前記ガス入口が前記センサー本体の一端部に形成され、前記ガス出口が前記センサー本体の他端部に形成された請求項１から３のいずれかに記載の排気センサー。 The exhaust sensor according to any one of claims 1 to 3, wherein the gas inlet is formed at one end of the sensor body, and the gas outlet is formed at the other end of the sensor body.
- 前記センサー本体の長手方向が前記排気管の長手方向に対して直交するように、前記センサー本体が前記排気管に挿入された請求項１から４のいずれかに記載の排気センサー。 The exhaust sensor according to any one of claims 1 to 4, wherein the sensor body is inserted into the exhaust pipe so that a longitudinal direction of the sensor body is orthogonal to a longitudinal direction of the exhaust pipe.
- 前記排気管にタービンが配設され、該タービンよりも排気ガス下流側の前記排気管に前記センサー本体が挿入された請求項１から５のいずれかに記載の排気センサー。 The exhaust sensor according to any one of claims 1 to 5, wherein a turbine is disposed in the exhaust pipe, and the sensor main body is inserted into the exhaust pipe downstream of the turbine.
- 前記タービンよりも排気ガス下流側の前記排気管に排ガス後処理装置が配設され、該排ガス後処理装置よりも排気ガス下流側の前記排気管に前記センサー本体が挿入された請求項１から６のいずれかに記載の排気センサー。 The exhaust gas aftertreatment device is disposed in the exhaust pipe downstream of the turbine from the exhaust gas, and the sensor main body is inserted in the exhaust pipe downstream of the exhaust gas aftertreatment device. The exhaust sensor according to any one of the above.
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| JP2010-094339 | 2010-04-15 | ||
| JP2010094339A JP5736662B2 (en) | 2010-04-15 | 2010-04-15 | Exhaust sensor |
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| WO2011129295A1 true WO2011129295A1 (en) | 2011-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2011/058993 WO2011129295A1 (en) | 2010-04-15 | 2011-04-11 | Exhaust sensor |
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| WO (1) | WO2011129295A1 (en) |
Cited By (2)
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| CN105888798A (en) * | 2015-02-17 | 2016-08-24 | 福特环球技术公司 | System For Sensing Particulate Matter |
| CN107916979A (en) * | 2016-10-10 | 2018-04-17 | 福特环球技术公司 | Method and system for exhaust particulate matter sensing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5429368B2 (en) * | 2010-04-30 | 2014-02-26 | トヨタ自動車株式会社 | PM amount detection device |
| WO2020179356A1 (en) * | 2019-03-01 | 2020-09-10 | 日本碍子株式会社 | Fine particle detection element and fine particle detector |
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| JP2011226824A (en) | 2011-11-10 |
| JP5736662B2 (en) | 2015-06-17 |
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