JP5736662B2 - Exhaust sensor - Google Patents

Exhaust sensor Download PDF

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JP5736662B2
JP5736662B2 JP2010094339A JP2010094339A JP5736662B2 JP 5736662 B2 JP5736662 B2 JP 5736662B2 JP 2010094339 A JP2010094339 A JP 2010094339A JP 2010094339 A JP2010094339 A JP 2010094339A JP 5736662 B2 JP5736662 B2 JP 5736662B2
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exhaust
sensor
gas
sensor body
exhaust gas
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JP2011226824A (en
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都志夫 一政
都志夫 一政
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Isuzu Motors Ltd
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Engines (AREA)
  • Exhaust Silencers (AREA)

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 that measures exhaust gas components.

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, and as an exhaust sensor, for example, PM (particulate matter) emission amount There is a PM sensor that detects

国際公開第２００９／１０９６８８号International Publication No. 2009/109688

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 to take the exhaust gas into the exhaust sensor (sensing part), the exhaust sensor is exhausted 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 main body exposed in the exhaust pipe, the exhaust gas stays inside the sensor main body, and 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。   Accordingly, an object of the present invention is to suppress the retention of exhaust gas inside the sensor body by generating an appropriate pressure difference between a gas inlet and a gas outlet formed in the sensor body.

上記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前記ガス入口より筒軸方向の上方に配置される上部出口と、該センサー本体の下端部に配置される下部出口と、のみを備えるガス出口とを備え、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 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 an opening facing the exhaust gas upstream side of the sensor body. a gas inlet that is, the sensor main body, and an upper outlet that will be placed above the cylinder axial direction than the previous SL gas inlet is opened so as to face the exhaust gas downstream side, bottom disposed at a lower end portion of the sensor body A gas outlet having only an outlet, and 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. It is a thing.

上記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、前記ガス出口の面積を前記ガス入口の面積よりも大きくしたものである。 In order to achieve the above 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 an opening facing the exhaust gas upstream side of the sensor body. And a gas outlet that opens to the sensor body facing the exhaust gas downstream side, and the area of the gas outlet is 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.

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.

図１は、本発明の一実施形態に係る排気センサーが装着されるエンジンの概略図である。FIG. 1 is a schematic view of an engine equipped with an exhaust sensor according to an embodiment of the present invention. 図２は、図１の要部拡大図である。FIG. 2 is an enlarged view of a main part of FIG. 図３は、他の実施形態に係る排気センサーが装着されるエンジンの要部拡大図である。FIG. 3 is an enlarged view of a main part of an engine to which an exhaust sensor according to another embodiment is mounted.

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。   DESCRIPTION OF EMBODIMENTS 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 according to the present embodiment is a vehicle-mounted sensor that is supposed to support 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 the present 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 the present 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 (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, the exhaust sensor 10 can be prevented 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、本発明は上記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. However, the present invention is not limited to the above 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 1 Engine 2 Intake pipe 3 Air cleaner 4 Turbo compressor 5 Exhaust pipe (tail pipe)
6 Turbine 7 Exhaust gas aftertreatment device 10 Exhaust sensor 11 Sensor body 12 Gas inlet 13 Gas outlet 16 Liquid discharge hole

Claims (3)

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前記ガス入口より筒軸方向の上方に配置される上部出口と、該センサー本体の下端部に配置される下部出口と、のみを備えるガス出口とを備え、
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 which is inserted into the exhaust pipe of the engine, the opening gas inlet facing the exhaust gas upstream side to the sensor body, the sensor body, an opening facing the exhaust-gas downstream side front Symbol comprising an upper outlet that will be located above the gas inlet of the tube-axis direction, and a lower outlet arranged at the lower end portion of the sensor body, and a gas outlet with a chisel,
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. 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、
前記ガス出口の面積を前記ガス入口の面積よりも大きく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 main body inserted into the exhaust pipe of the engine, a gas inlet opened to the sensor main body facing the exhaust gas upstream side, and a gas outlet opened to the sensor main body facing the exhaust gas downstream side; With
An exhaust sensor, 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２に記載の排気センサー。 The exhaust sensor according to claim 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.
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