JP2008151080A - Exhaust emission control device - Google Patents

Exhaust emission control device Download PDF

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JP2008151080A
JP2008151080A JP2006342066A JP2006342066A JP2008151080A JP 2008151080 A JP2008151080 A JP 2008151080A JP 2006342066 A JP2006342066 A JP 2006342066A JP 2006342066 A JP2006342066 A JP 2006342066A JP 2008151080 A JP2008151080 A JP 2008151080A
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catalyst
exhaust gas
case
upstream
downstream
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JP4915514B2 (en
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Kuni Sugiura
久仁 杉浦
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Suzuki Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of reducing the overall length of a catalyst case to improve its mountability on a vehicle and improving exhaust gas purification performance. <P>SOLUTION: In this exhaust emission control device, the catalyst case 11, which is constructed by connecting an upstream side case part 11A, a downstream side case part 11B, and a connection case part 11C connecting the both case parts 11A and 11b together in series, is installed in an exhaust pipe of an engine, and an upstream side catalyst 22 and a downstream side catalyst 23 are individually housed inside the upstream side case part 11A and the downstream side case part 11B of the catalyst case 11, while an exhaust gas sensor 25 is installed in the connection case part 11C. When the upstream side catalyst 22 and the downstream side catalyst 23 are arranged aslant so that their axes cross each other, a wedge-shaped space S is formed between the upstream side catalyst 22 and the downstream side catalyst 23 inside the catalyst case 11, and the exhaust gas sensor 25 is installed on the radial one side on which the height of the connection case part 11C is raised. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、触媒ケース内に上流側触媒と下流側触媒を直列に配設するとともに、両触媒間に排気ガスセンサを配設して成る排気ガス浄化装置に関するものである。   The present invention relates to an exhaust gas purification device in which an upstream catalyst and a downstream catalyst are arranged in series in a catalyst case, and an exhaust gas sensor is arranged between the two catalysts.

エンジンの排気系には、排気ガス中に含まれるＣＯ、ＨＣ、ＮＯＸ 等の有害成分を触媒物質に接触させて排気ガスを浄化するための排気ガス浄化装置が設けられている。ここで、排気ガス浄化装置の一例を図６に示す。 The exhaust system of the engine, CO, HC, the exhaust gas purifying device for purifying exhaust gas is brought into contact with the catalyst material harmful components such as NO X is provided in the exhaust gas. Here, an example of the exhaust gas purification device is shown in FIG.

図６は車両用エンジンに設けられる従来の排気ガス浄化装置１１０の破断正面図であり、図示の排気ガス浄化装置１１０は、その軸線方向が車両の上下方向に向くよう縦置きされた円筒状の触媒ケース１１１を備えており、この触媒ケース１１１は、上流側ケース部１１１Ａと下流側ケース部１１１Ｂ及びこれら両ケース部１１１Ａ，１１１Ｂ間を連絡する連絡ケース部１１１Ｃを直列に連結して構成されている。   FIG. 6 is a cutaway front view of a conventional exhaust gas purifying device 110 provided in a vehicle engine. The exhaust gas purifying device 110 shown in FIG. 6 has a cylindrical shape placed vertically so that its axial direction is in the vertical direction of the vehicle. The catalyst case 111 includes an upstream case portion 111A, a downstream case portion 111B, and a communication case portion 111C that connects the case portions 111A and 111B in series. Yes.

そして、触媒ケース１１１の上端には上流側排気管１１２が接続されており、該上流側排気管１１２の上流側端部は、接合フランジ１１３を介して不図示の排気マニホールドや過給機の排気タービンの出口に取り付けられている。又、触媒ケース１１１の下端には下流側排気管１１４が接続されており、該下流側排気管１１４の下流側端部は、車体の下部を車体後方に向かって延設された不図示の排気管に接合フランジ１１５を介して接続されている。   An upstream exhaust pipe 112 is connected to the upper end of the catalyst case 111, and the upstream end of the upstream exhaust pipe 112 is connected to an exhaust manifold (not shown) or an exhaust of a supercharger via a joint flange 113. It is attached to the turbine outlet. A downstream exhaust pipe 114 is connected to the lower end of the catalyst case 111, and the downstream end of the downstream exhaust pipe 114 is an exhaust gas (not shown) extending from the lower part of the vehicle body toward the rear of the vehicle body. It is connected to the pipe via a joint flange 115.

而して、触媒ケース１１１の上流側ケース部１１１Ａと下流側ケース部１１１Ｂには円柱状の上流側触媒１２２と下流側触媒１２３がその周囲を保持部材（保持マット）１２４によって保持された状態でそれぞれ収容されている。そして、前記上流側排気管１１２には上流側排気ガスセンサ１２６が取り付けられ、触媒ケース１１１の前記連絡ケース部１１１Ｃには下流側排気ガスセンサ１２５が取り付けられている。ここで、上流側排気ガスセンサ１２６は、排気ガス中の酸素濃度を検出するＯ2 センサであって、該Ｏ2センサ１２６によって検出された酸素濃度は不図示のエンジン制御装置（ＥＣＵ）にフィードバックされ、この酸素濃度に基づいて混合気の空燃比（Ａ／Ｆ）が理論空燃比に近づくよう燃料噴射料が制御される。又、下流側排気ガスセンサ１２５は、上流側触媒の劣化を検知するためのセンサである。 Thus, in the upstream case portion 111A and the downstream case portion 111B of the catalyst case 111, the cylindrical upstream catalyst 122 and the downstream catalyst 123 are held by the holding member (holding mat) 124 around the periphery. Each is housed. An upstream exhaust gas sensor 126 is attached to the upstream exhaust pipe 112, and a downstream exhaust gas sensor 125 is attached to the communication case portion 111 </ b> C of the catalyst case 111. Here, the upstream side exhaust gas sensor 126 is an O 2 sensor that detects the oxygen concentration in the exhaust gas, and the oxygen concentration detected by the O 2 sensor 126 is fed back to an engine control unit (ECU) (not shown). Based on this oxygen concentration, the fuel injection rate is controlled so that the air-fuel ratio (A / F) of the air-fuel mixture approaches the stoichiometric air-fuel ratio. The downstream exhaust gas sensor 125 is a sensor for detecting deterioration of the upstream catalyst.

ところで、斯かる排気ガス浄化装置に関しては今までに種々の提案がなされている。   By the way, various proposals have been made so far regarding such an exhaust gas purification device.

例えば、特許文献１には、触媒担体内に第１及び第２の２つの排気ガス通路を並設し、両排気ガス通路を円弧状に湾曲したリターン通路で接続するとともに、該リターン通路に排気ガスセンサを配置する構成が開示されており、これによれば酸素濃度を高精度に検知するとともに、低コストで排気ガス浄化性能を高めることができる。   For example, in Patent Document 1, first and second exhaust gas passages are arranged in parallel in a catalyst carrier, both exhaust gas passages are connected by a return passage curved in an arc shape, and exhaust gas is supplied to the return passage. The structure which arrange | positions a gas sensor is disclosed, According to this, while being able to detect oxygen concentration with high precision, exhaust gas purification performance can be improved at low cost.

又、特許文献２には、触媒ケース内に直列に収納された一対の触媒間の距離を短縮するための排気ガスセンサの取付構造が提案されている。具体的には、触媒ケースにおける上流側触媒の下流端部に対応する部位と下流側触媒の上流端部に対応する部位に径方向内側への絞縮部をそれぞれ設けるとともに、これらの絞縮部に下流側に向かって径が次第に小さくなる円錐面部を設け、該円錐面部にその軸方向が触媒ケースの軸線方向と略直交するように排気ガスセンサ（Ｏ2 センサ）を取り付ける構成が提案されている。
特開昭６４−０３９４１６号公報 特開２００４−１９７６６２号公報 Patent Document 2 proposes an exhaust gas sensor mounting structure for reducing the distance between a pair of catalysts housed in series in a catalyst case. Specifically, in the catalyst case, a portion corresponding to the downstream end portion of the upstream catalyst and a portion corresponding to the upstream end portion of the downstream catalyst are provided with a radially inwardly narrowing portion, and these narrowing portions A configuration has been proposed in which a conical surface portion whose diameter gradually decreases toward the downstream side and an exhaust gas sensor (O 2 sensor) is attached to the conical surface portion so that the axial direction thereof is substantially perpendicular to the axial direction of the catalyst case. .
JP-A 64-039416 JP 2004-197662 A

しかしながら、図６に示した従来の排気ガス浄化装置１１０においては、触媒ケース１１１内に上流側触媒１２２と下流側触媒１２３がそれらの軸線が一致するよう一直線上にストレートに並設されているため、触媒ケース１１１内の両触媒１２２，１２３間には円柱状の空間Ｓ’が形成され、この空間Ｓ’の高さ寸法を下流側ガスセンサ１２５を取り付けることができる大きさに設定しなければならなかった。このため、空間Ｓ’の高さ寸法、延いては触媒ケース１１１の全長Ｌ’が長くなり、当該排気ガス浄化装置１１０の車両への搭載性が悪くなるという問題があった。   However, in the conventional exhaust gas purification device 110 shown in FIG. 6, the upstream catalyst 122 and the downstream catalyst 123 are arranged in a straight line in a straight line in the catalyst case 111 so that their axes coincide. A cylindrical space S ′ is formed between the two catalysts 122 and 123 in the catalyst case 111, and the height of the space S ′ must be set to a size that allows the downstream gas sensor 125 to be attached. There wasn't. For this reason, there is a problem that the height dimension of the space S ′, and hence the total length L ′ of the catalyst case 111 becomes long, and the mountability of the exhaust gas purifying device 110 on the vehicle is deteriorated.

又、触媒ケース１１１内の円柱状の空間Ｓ’の高さ寸法が大きくなると、触媒ケース１１１内で上流側触媒１２３を通過した排気ガスが空間Ｓ’を流れる間に外気によって冷却され、エンジン始動後の下流側触媒１２３の温度上昇が遅くなって該下流側触媒１２３の活性化が遅れ、当該排気ガス浄化装置１１０の排気ガス浄化性能が低下するという問題もあった。   When the height of the cylindrical space S ′ in the catalyst case 111 is increased, the exhaust gas that has passed through the upstream catalyst 123 in the catalyst case 111 is cooled by the outside air while flowing through the space S ′, and the engine is started. There was also a problem that the temperature increase of the downstream catalyst 123 later was delayed, the activation of the downstream catalyst 123 was delayed, and the exhaust gas purification performance of the exhaust gas purification device 110 was lowered.

他方、特許文献１に開示された構成では、排気ガスがリターン通路を流れる間に外気によって冷却されるため、下流側の触媒の活性化が不十分で、その排気ガス浄化性能が低下するという問題がある。   On the other hand, in the configuration disclosed in Patent Document 1, since the exhaust gas is cooled by the outside air while flowing through the return passage, activation of the downstream catalyst is insufficient and the exhaust gas purification performance is deteriorated. There is.

又、特許文献２に開示された構成では、排気ガスセンサの取付構造の工夫によって触媒間の距離を短縮することができる効果は十分でなく、排気ガス浄化装置の車両への搭載性を高めるまでには至っていないのが実情である。   Further, with the configuration disclosed in Patent Document 2, the effect of shortening the distance between the catalysts by devising the mounting structure of the exhaust gas sensor is not sufficient, and the mounting of the exhaust gas purification device on a vehicle is improved. The situation is not reached.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、触媒ケースの全長を短縮して車両への搭載性の向上を図るとともに、排気ガス浄化性能の向上を図ることができる排気ガス浄化装置を提供することにある。   The present invention has been made in view of the above problems, and the object of the present invention is to shorten the overall length of the catalyst case to improve the mounting property on the vehicle and to improve the exhaust gas purification performance. An object is to provide an exhaust gas purification device.

上記目的を達成するため、請求項１記載の発明は、上流側ケース部と下流側ケース部及びこれら両ケース部間を連絡する連絡ケース部を直列に連結して成る触媒ケースをエンジンの排気管に取り付け、該触媒ケースの前記上流側ケース部と前記下流側ケース部内に上流側触媒と下流側触媒をそれぞれ収容するとともに、前記連絡ケース部に排気ガスセンサを取り付けて構成される排気ガス浄化装置において、前記上流側触媒と前記下流側触媒を各軸線が互いに交差するよう傾斜させて配置することによって前記触媒ケース内の上流側触媒と下流側触媒の間に楔状空間を形成し、前記連絡ケース部の高さが高い径方向一側に前記排気ガスセンサを取り付けたことを特徴とする。   In order to achieve the above object, an invention according to claim 1 is directed to an engine exhaust pipe having a catalyst case formed by connecting an upstream case portion, a downstream case portion, and a communication case portion communicating between the two case portions in series. An exhaust gas purifying apparatus configured to accommodate an upstream catalyst and a downstream catalyst in the upstream case portion and the downstream case portion of the catalyst case, respectively, and an exhaust gas sensor attached to the communication case portion. A wedge-shaped space is formed between the upstream catalyst and the downstream catalyst in the catalyst case by arranging the upstream catalyst and the downstream catalyst so that the respective axes intersect with each other, and the connecting case portion The exhaust gas sensor is mounted on one side in the radial direction where the height of the gas sensor is high.

請求項２記載の発明は、請求項１記載の発明において、前記触媒ケースの上流側端部に接続された上流側排気管を、その軸中心が前記上流側触媒の軸中心と交差して前記排気ガスセンサを指向するよう上流側触媒に対して傾斜させたことを特徴とする。   The invention according to claim 2 is the invention according to claim 1, wherein the upstream exhaust pipe connected to the upstream end portion of the catalyst case has an axial center intersecting the axial center of the upstream catalyst. It is characterized in that it is inclined with respect to the upstream side catalyst so as to face the exhaust gas sensor.

請求項３記載の発明は、請求項１又は２記載の発明において、前記エンジンの車載状態において、前記触媒ケースを、車幅方向一側に配設されたラジエータに近接した位置に、その軸線方向が車両上下方向となるよう配設するとともに、該触媒ケースの前記連絡ケース部の周方向において前記ラジエータから離れた位置に前記排気ガスセンサを取り付けたことを特徴とする。   According to a third aspect of the present invention, in the first or second aspect of the present invention, in the on-vehicle state of the engine, the catalyst case is positioned in the axial direction at a position close to a radiator disposed on one side in the vehicle width direction. Is arranged in the vehicle vertical direction, and the exhaust gas sensor is attached at a position away from the radiator in the circumferential direction of the communication case portion of the catalyst case.

請求項１記載の発明によれば、連絡ケース部の高さが高い径方向一側に排気ガスセンサを取り付けるスペースを確保しつつ、触媒ケース内の上流側触媒と下流側触媒の間に形成される空間を従来の円柱状空間から楔状空間に変更して空間の容積を減少させることができる。この結果、触媒ケースの全長を短縮して当該排気ガス浄化装置の車両への搭載性を高めることができる。又、触媒ケースの連絡ケース部の表面積（伝熱面積）を減少させて排気ガスの外気による冷却を抑制し、排気ガスによる下流側触媒の温度上昇を促進して該下流側触媒の活性化を図り、当該排気ガス浄化装置の排気ガス浄化性能を高めることができる。   According to the first aspect of the present invention, the space between the upstream side catalyst and the downstream side catalyst in the catalyst case is formed while securing a space for attaching the exhaust gas sensor to one side in the radial direction where the height of the connecting case portion is high. The volume of the space can be reduced by changing the space from a conventional cylindrical space to a wedge-shaped space. As a result, it is possible to shorten the overall length of the catalyst case and improve the mountability of the exhaust gas purifying device on the vehicle. In addition, the surface area (heat transfer area) of the communication case portion of the catalyst case is reduced to suppress cooling of the exhaust gas by outside air, and the temperature increase of the downstream catalyst by the exhaust gas is promoted to activate the downstream catalyst. Therefore, the exhaust gas purification performance of the exhaust gas purification device can be improved.

請求項２記載の発明によれば、触媒ケースの上流側端部に接続された上流側排気管を、その軸中心が上流側触媒の軸中心と交差して排気ガスセンサを指向するよう上流側触媒に対して傾斜させたため、排気ガスセンサの周囲を流れる排気ガスの流量が増加し、排気ガスセンサの検出精度が高められて上流側触媒の劣化を正確に検知することができる。   According to the second aspect of the present invention, the upstream side exhaust pipe connected to the upstream side end of the catalyst case is arranged so that its axial center crosses the axial center of the upstream catalyst and faces the exhaust gas sensor. Therefore, the flow rate of the exhaust gas flowing around the exhaust gas sensor is increased, the detection accuracy of the exhaust gas sensor is increased, and the deterioration of the upstream catalyst can be accurately detected.

請求項３記載の発明によれば、排気ガスセンサを、排気ガス温度が変動し易いラジエータ近傍から離れた位置に取り付けたため、排気ガス浄化装置の制御を安定化させて排気ガス浄化性能を向上させることができる。   According to the invention described in claim 3, since the exhaust gas sensor is mounted at a position away from the vicinity of the radiator where the exhaust gas temperature is likely to fluctuate, the control of the exhaust gas purification device is stabilized and the exhaust gas purification performance is improved. Can do.

以下に本発明の実施の形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は本発明に係る排気ガス浄化装置を備えたエンジンの平面図、図２は同エンジンの正面図である。   FIG. 1 is a plan view of an engine equipped with an exhaust gas purifying apparatus according to the present invention, and FIG. 2 is a front view of the engine.

図示のエンジン１は、不図示の車両前部のエンジンルーム内に横置き状態で搭載される直列４気筒エンジンであって、不図示のクランク軸は車幅方向（図１及び図２の左右方向）に配されている。ここで、エンジン１には４つの気筒が車幅方向に並設されており、シリンダブロック２の上部に被着されたシリンダヘッド３の吸気側（車両後方側）には、該シリンダヘッド３に各気筒毎に形成された不図示の吸気ポートに連なる不図示の４本の吸気マニホールドが接続されている。尚、図１に示すように、エンジン１の左側面には、クランク軸の回転を変速して不図示のプロペラシャフト及び駆動輪に伝達するための変速機４が取り付けられている。   The illustrated engine 1 is an in-line four-cylinder engine mounted horizontally in an engine room (not shown) in the front of the vehicle, and a crankshaft (not shown) is arranged in the vehicle width direction (the left-right direction in FIGS. 1 and 2). ). Here, four cylinders are arranged in parallel in the vehicle width direction in the engine 1, and the cylinder head 3 is attached to the intake side (rear side of the vehicle) of the cylinder head 3 attached to the upper part of the cylinder block 2. Four intake manifolds (not shown) connected to an intake port (not shown) formed for each cylinder are connected. As shown in FIG. 1, a transmission 4 is mounted on the left side surface of the engine 1 for shifting the rotation of the crankshaft and transmitting it to a propeller shaft and drive wheels (not shown).

又、シリンダヘッド３の排気側（車両前方側）には、該シリンダヘッド３に各気筒毎に形成された不図示の排気ポートに連なる４本の排気マニホールド５が接続されており、これらの排気マニホールド５は遮熱カバー６によって覆われている。そして、図２に示すように、エンジン１の排気側（前面）にはターボチャージャ７が配置されており、前記４本の排気マニホールド５は集合してターボチャージャ７の排気タービン８の入口側に接続されている。   Further, four exhaust manifolds 5 connected to an exhaust port (not shown) formed for each cylinder are connected to the cylinder head 3 on the exhaust side (front side of the vehicle). The manifold 5 is covered with a heat shield cover 6. As shown in FIG. 2, a turbocharger 7 is arranged on the exhaust side (front surface) of the engine 1, and the four exhaust manifolds 5 are gathered to the inlet side of the exhaust turbine 8 of the turbocharger 7. It is connected.

ここで、ターボチャージャ７は、排気タービン８と同軸にコンプレッサ９を備えており、排気ガスによって駆動される排気タービン８によってコンプレッサ９を駆動し、このコンプレッサ９によって吸気を過給してエンジン１の吸気系に供給することによって該エンジン１の出力向上を図るものである。   Here, the turbocharger 7 is provided with a compressor 9 coaxially with the exhaust turbine 8. The compressor 9 is driven by the exhaust turbine 8 driven by exhaust gas, and the intake air is supercharged by the compressor 9. The output of the engine 1 is improved by supplying it to the intake system.

ところで、図２に示すように、エンジン１の前面側（排気側）には、本発明に係る排気ガス浄化装置１０がその軸線方向を車両上下方向にして縦置き状態で配設されており、円筒状の触媒ケース１１の上端から上方へ延びる上流側排気管１２は、接合フランジ１３を介してターボチャージャ７の排気タービン８の出口に接続されている。又、触媒ケース１１の下端から下方へ延びる下流側排気管１４は、車体の下部を車体後方に向かって延設された不図示の排気管に接合フランジ１５を介して接続されている。   By the way, as shown in FIG. 2, an exhaust gas purifying device 10 according to the present invention is disposed on the front side (exhaust side) of the engine 1 in a vertically placed state with its axial direction as the vehicle vertical direction. An upstream exhaust pipe 12 extending upward from the upper end of the cylindrical catalyst case 11 is connected to an outlet of the exhaust turbine 8 of the turbocharger 7 via a joint flange 13. Further, the downstream exhaust pipe 14 extending downward from the lower end of the catalyst case 11 is connected to an exhaust pipe (not shown) extending from the lower portion of the vehicle body toward the rear of the vehicle body via a joint flange 15.

他方、エンジン１の前方であって、車両前部の左側部分にはラジエータ１６が配設されており、このラジエータ１６にはファン１７及び不図示の熱交換器が備えられ、その後面にはファンシュラウド１８が取り付けられている（図１参照）。尚、図中、１９，２０，２１は冷却配管である。   On the other hand, a radiator 16 is disposed in front of the engine 1 and on the left side of the front portion of the vehicle. The radiator 16 is provided with a fan 17 and a heat exchanger (not shown). A shroud 18 is attached (see FIG. 1). In the figure, numerals 19, 20, and 21 are cooling pipes.

次に、本発明に係る前記排気ガス浄化装置１０の構成の詳細を図３〜図５に基づいて説明する。尚、図３は排気ガス浄化装置の一部を破断して示す斜視図、図４は同排気ガス浄化装置の平面図、図５は同排気ガス浄化装置の正面図である。   Next, details of the configuration of the exhaust gas purifying apparatus 10 according to the present invention will be described with reference to FIGS. 3 is a perspective view showing a part of the exhaust gas purifying device in a cutaway state, FIG. 4 is a plan view of the exhaust gas purifying device, and FIG. 5 is a front view of the exhaust gas purifying device.

本発明に係る排気ガス浄化装置１０は、その軸線方向が車両の上下方向に向くよう縦置きされた円筒状の触媒ケース１１を備えており、この触媒ケース１１は、上流側ケース部１１Ａと下流側ケース部１１Ｂ及びこれら両ケース部１１Ａ，１１Ｂ間を連絡する連絡ケース部１１Ｃを直列に連結して構成されている。そして、触媒ケース１１の上流側ケース部１１Ａと下流側ケース部１１Ｂ内には円柱状の上流側触媒２２と下流側触媒２３がその周囲を保持部材（保持マット）２４によって保持された状態でそれぞれ収容されている。尚、上流側触媒２２と下流側触媒２３は、例えば断面ハニカム状のセラミック製のモノリス担体に白金（Ｐｔ）等の貴金属を担持せしめて構成されている。   The exhaust gas purifying apparatus 10 according to the present invention includes a cylindrical catalyst case 11 that is vertically arranged so that the axial direction thereof is in the vertical direction of the vehicle. The catalyst case 11 includes an upstream case portion 11A and a downstream side. The side case portion 11B and a communication case portion 11C that communicates between the two case portions 11A and 11B are connected in series. In the upstream case portion 11A and the downstream case portion 11B of the catalyst case 11, a cylindrical upstream catalyst 22 and a downstream catalyst 23 are respectively held in a state in which the periphery thereof is held by a holding member (holding mat) 24. Contained. The upstream catalyst 22 and the downstream catalyst 23 are configured, for example, by supporting a noble metal such as platinum (Pt) on a ceramic monolith support having a honeycomb cross section.

而して、本実施の形態に係る排気浄化装置１０においては、上流側触媒２２と下流側触媒２３を各軸線を互いに交差するよう傾斜させて配置することによって触媒ケース１１内の上流側触媒２２と下流側触媒２３の間（つまり、連絡ケース１１Ｃ内）に楔状空間Ｓを形成し、連絡ケース部１１Ｃの高さが高い径方向一側に下流側排気ガスセンサ２５を取り付けている。   Thus, in the exhaust purification apparatus 10 according to the present embodiment, the upstream catalyst 22 and the downstream catalyst 23 are disposed so that the respective axes are inclined so as to intersect each other, thereby the upstream catalyst 22 in the catalyst case 11. And a downstream catalyst 23 (that is, in the communication case 11C), a wedge-shaped space S is formed, and the downstream exhaust gas sensor 25 is attached to one radial side where the height of the communication case portion 11C is high.

又、触媒ケース１１の上流側端部に接続された前記上流側排気管１２は、その軸中心が上流側触媒２２の軸中心と交差して前記下流側排気ガスセンサ２５を指向するよう上流側触媒２２に対して傾斜しており、上流側排気管１２には上流側排気ガスセンサ２６が取り付けられている。ここで、上流側排気ガスセンサ２６は、排気ガス中の酸素濃度を検出するＯ2 センサであり、下流側排気ガスセンサ２５は、上流側触媒２２の劣化を検知するためのセンサである。 Further, the upstream exhaust pipe 12 connected to the upstream end of the catalyst case 11 has its axial center intersecting the axial center of the upstream catalyst 22 and directed to the downstream exhaust gas sensor 25. 22 and an upstream exhaust gas sensor 26 is attached to the upstream exhaust pipe 12. Here, the upstream side exhaust gas sensor 26 is an O 2 sensor that detects the oxygen concentration in the exhaust gas, and the downstream side exhaust gas sensor 25 is a sensor for detecting the deterioration of the upstream side catalyst 22.

更に、本実施の形態では、図１及び図２に示すように、触媒ケース１１は、車両前部の左側部分に配設された前記ラジエータ１６に近接した位置に、その軸線方向が車両上下方向となるよう配設されており、該触媒ケース１１の連絡ケース部１１Ｃの周方向においてラジエータ１６から離れた位置に下流側排気ガスセンサ２５が取り付けられている。   Further, in the present embodiment, as shown in FIGS. 1 and 2, the catalyst case 11 is positioned close to the radiator 16 disposed on the left side of the front portion of the vehicle, and its axial direction is the vehicle vertical direction. A downstream exhaust gas sensor 25 is attached at a position away from the radiator 16 in the circumferential direction of the communication case portion 11C of the catalyst case 11.

而して、エンジン１が始動されると、該エンジン１の各気筒での混合気の燃焼によって発生した高温の排気ガスは、排気マニホールド５を通ってターボチャージャ７の排気タービン８に導入されて該排気タービン８を回転駆動した後、本発明に係る排気ガス浄化装置１０に導入されて浄化される。   Thus, when the engine 1 is started, the high-temperature exhaust gas generated by the combustion of the air-fuel mixture in each cylinder of the engine 1 is introduced into the exhaust turbine 8 of the turbocharger 7 through the exhaust manifold 5. After the exhaust turbine 8 is rotationally driven, it is introduced into the exhaust gas purification device 10 according to the present invention and purified.

即ち、排気ガス浄化装置１０においては、排気タービン８から排出される排気ガスが上流側排気管１２から触媒ケース１１内に導入され、触媒ケース１１内に収容された上流側触媒２２を排気ガスが通過することによって該排気ガスが浄化される。尚、上流側排気管１２を流れる排気ガス中の酸素濃度は上流側排気ガスセンサ２６によって検出され、検出された酸素濃度に基づいて混合気の空燃比（Ａ／Ｆ）が理論空燃比に近づくよう燃料噴射料が制御される。   That is, in the exhaust gas purification device 10, exhaust gas discharged from the exhaust turbine 8 is introduced into the catalyst case 11 from the upstream exhaust pipe 12, and the exhaust gas passes through the upstream catalyst 22 accommodated in the catalyst case 11. The exhaust gas is purified by passing through. The oxygen concentration in the exhaust gas flowing through the upstream side exhaust pipe 12 is detected by the upstream side exhaust gas sensor 26, and the air-fuel ratio (A / F) of the air-fuel mixture approaches the stoichiometric air-fuel ratio based on the detected oxygen concentration. The fuel injection fee is controlled.

そして、上流側触媒２２を通過して浄化された排気ガスは、連絡ケース部１１Ｃ内の楔上空間Ｓを下方に向かって流れて下流側触媒２３へと導入され、この下流側触媒２３を通過することによって再度浄化された後、下流側排気管１４から触媒ケース１１外へと排出され、下流側排気管１４に連なる不図示の排気管及びサイレンサを通って大気中に排出される。   The exhaust gas purified by passing through the upstream catalyst 22 flows downward in the wedge upper space S in the connecting case portion 11C and is introduced into the downstream catalyst 23, and passes through the downstream catalyst 23. After being purified again, the exhaust gas is discharged from the downstream exhaust pipe 14 to the outside of the catalyst case 11, and exhausted to the atmosphere through an exhaust pipe and a silencer (not shown) connected to the downstream exhaust pipe 14.

以上において、本発明に係る排気ガス浄化装置１０においては、上流側触媒２２と下流側触媒２３を各軸線を互いに交差するよう傾斜させて配置することによって触媒ケース１１内の上流側触媒２２と下流側触媒２３の間に楔状空間Ｓを形成し、連絡ケース部１１Ｃの高さが高い径方向一側に下流側排気ガスセンサ２５を取り付けたため、連絡ケース部１１Ｃの高さが高い径方向一側に排気ガスセンサ２５を取り付けるスペースを確保しつつ、触媒ケース１１内の上流側触媒２２と下流側触媒２３の間に形成される空間を従来の円柱状空間Ｓ’（図６参照）から楔状空間Ｓに変更して該楔状空間Ｓの容積を減少させることができる。この結果、触媒ケース１１の全長Ｌを短縮して当該排気ガス浄化装置１０の車両への搭載性を高めることができる。又、触媒ケース１１の連絡ケース部１１Ｃの表面積（伝熱面積）を減少させて排気ガスの外気による冷却を抑制し、排気ガスによる下流側触媒２３の温度上昇を促進して該下流側触媒２３の活性化を図り、当該排気ガス浄化装置１０の排気ガス浄化性能を高めることができる。   In the above, in the exhaust gas purifying apparatus 10 according to the present invention, the upstream catalyst 22 and the downstream catalyst 23 are disposed so that the respective axes are inclined so as to intersect with each other, whereby the upstream catalyst 22 and the downstream catalyst in the catalyst case 11 are arranged. Since the wedge-shaped space S is formed between the side catalysts 23 and the downstream side exhaust gas sensor 25 is attached to one radial side where the height of the communication case portion 11C is high, the communication case portion 11C is high on the one radial side. The space formed between the upstream catalyst 22 and the downstream catalyst 23 in the catalyst case 11 is changed from the conventional cylindrical space S ′ (see FIG. 6) to the wedge-shaped space S while ensuring a space for mounting the exhaust gas sensor 25. By changing it, the volume of the wedge-shaped space S can be reduced. As a result, the total length L of the catalyst case 11 can be shortened, and the mountability of the exhaust gas purification device 10 on the vehicle can be improved. Further, the surface area (heat transfer area) of the communication case portion 11C of the catalyst case 11 is reduced to suppress the cooling of the exhaust gas by the outside air, and the temperature increase of the downstream catalyst 23 by the exhaust gas is promoted, thereby the downstream catalyst 23. The exhaust gas purification performance of the exhaust gas purification device 10 can be enhanced.

又、本実施の形態によれば、触媒ケース１１の上流側端部に接続された上流側排気管１２を、その軸中心が上流側触媒２２の軸中心と交差して下流側排気ガスセンサ２５を指向するよう上流側触媒２２に対して傾斜させたため、下流側排気ガスセンサ２５の周囲を流れる排気ガスの流量が増加し、下流側排気ガスセンサ２５の検出精度が高められて上流側触媒２２の劣化を正確に検知することができる。   Further, according to the present embodiment, the upstream side exhaust pipe 12 connected to the upstream end of the catalyst case 11 is connected to the downstream side exhaust gas sensor 25 so that its axial center intersects the axial center of the upstream side catalyst 22. Since it is inclined with respect to the upstream side catalyst 22 so as to be directed, the flow rate of the exhaust gas flowing around the downstream side exhaust gas sensor 25 is increased, the detection accuracy of the downstream side exhaust gas sensor 25 is improved, and the upstream side catalyst 22 is deteriorated. It can be detected accurately.

更に、本実施の形態によれば、下流側排気ガスセンサ２５を、排気ガス温度が変動し易いラジエータ１６の近傍から離れた位置に取り付けたため、排気ガス浄化装置１０の制御を安定化させて排気ガス浄化性能を向上させることができる。   Furthermore, according to the present embodiment, since the downstream side exhaust gas sensor 25 is mounted at a position away from the vicinity of the radiator 16 where the exhaust gas temperature is likely to fluctuate, the control of the exhaust gas purification device 10 is stabilized and the exhaust gas is stabilized. The purification performance can be improved.

本発明に係る排気ガス浄化装置を備えたエンジンの平面図である。It is a top view of the engine provided with the exhaust-gas purification apparatus which concerns on this invention. 本発明に係る排気ガス浄化装置を備えたエンジンの正面図である。1 is a front view of an engine provided with an exhaust gas purification device according to the present invention. 本発明に係る排気ガス浄化装置の一部を破断して示す斜視図である。It is a perspective view which fractures | ruptures and shows a part of exhaust gas purification apparatus which concerns on this invention. 本発明に係る排気ガス浄化装置の平面図である。It is a top view of the exhaust-gas purification apparatus which concerns on this invention. 本発明に係る排気ガス浄化装置の正面図である。1 is a front view of an exhaust gas purification device according to the present invention. 従来の排気ガス浄化装置の破断正面図である。It is a fracture front view of the conventional exhaust gas purification device.

符号の説明Explanation of symbols

１ エンジン
２ シリンダブロック
３ シリンダヘッド
４ 変速機
５ 排気マニホールド
６ 遮熱カバー
７ ターボチャージャ
８ 排気タービン
９ コンプレッサ
１０ 排気ガス浄化装置
１１ 触媒ケース
１１Ａ 触媒ケースの上流側ケース部
１１Ｂ 触媒ケースの下流側ケース部
１１Ｃ 触媒ケースの連絡ケース部
１２ 上流側排気管
１３ 接合フランジ
１４ 下流側排気管
１５ 接合フランジ
１６ ラジエータ
１７ ファン
１８ ファンシュラウド
１９〜２１ 冷却配管
２２ 上流側触媒
２３ 下流側触媒
２４ 保持部材（保持マット）
２５ 下流側排気ガスセンサ
２６ 上流側排気ガスセンサ
Ｌ 触媒ケースの全長
Ｓ 楔状空間 DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder block 3 Cylinder head 4 Transmission 5 Exhaust manifold 6 Thermal insulation cover 7 Turbocharger 8 Exhaust turbine 9 Compressor 10 Exhaust gas purification device 11 Catalyst case 11A Upstream case part of catalyst case 11B Downstream case part of catalyst case 11C Connecting Case Part of Catalyst Case 12 Upstream Exhaust Pipe 13 Joint Flange 14 Downstream Side Exhaust Pipe 15 Joint Flange 16 Radiator 17 Fan 18 Fan Shroud 19-21 Cooling Pipe 22 Upstream Catalyst 23 Downstream Catalyst 24 Holding Member (Holding Mat)
25 Downstream exhaust gas sensor 26 Upstream exhaust gas sensor L Total length of catalyst case S Wedge-shaped space

Claims (3)

上流側ケース部と下流側ケース部及びこれら両ケース部間を連絡する連絡ケース部を直列に連結して成る触媒ケースをエンジンの排気管に取り付け、該触媒ケースの前記上流側ケース部と前記下流側ケース部内に上流側触媒と下流側触媒をそれぞれ収容するとともに、前記連絡ケース部に排気ガスセンサを取り付けて構成される排気ガス浄化装置において、
前記上流側触媒と前記下流側触媒を各軸線が互いに交差するよう傾斜させて配置することによって前記触媒ケース内の上流側触媒と下流側触媒の間に楔状空間を形成し、前記連絡ケース部の高さが高い径方向一側に前記排気ガスセンサを取り付けたことを特徴とする排気ガス浄化装置。 A catalyst case formed by connecting an upstream case portion, a downstream case portion, and a connecting case portion connecting these two case portions in series is attached to an exhaust pipe of the engine, and the upstream case portion and the downstream case of the catalyst case are attached. In the exhaust gas purifying apparatus configured to accommodate the upstream catalyst and the downstream catalyst in the side case part and to which an exhaust gas sensor is attached to the communication case part,
A wedge-shaped space is formed between the upstream catalyst and the downstream catalyst in the catalyst case by arranging the upstream catalyst and the downstream catalyst so that the respective axes intersect with each other, An exhaust gas purifying apparatus, wherein the exhaust gas sensor is attached to one side in a radial direction having a high height. 前記触媒ケースの上流側端部に接続された上流側排気管を、その軸中心が前記上流側触媒の軸中心と交差して前記排気ガスセンサを指向するよう上流側触媒に対して傾斜させたことを特徴とする請求項１記載の排気ガス浄化装置。   The upstream exhaust pipe connected to the upstream end of the catalyst case is inclined with respect to the upstream catalyst so that its axial center intersects the axial center of the upstream catalyst and faces the exhaust gas sensor. The exhaust gas purifying device according to claim 1. 前記エンジンの車載状態において、前記触媒ケースを、車幅方向一側に配設されたラジエータに近接した位置に、その軸線方向が車両上下方向となるよう配設するとともに、該触媒ケースの前記連絡ケース部の周方向において前記ラジエータから離れた位置に前記排気ガスセンサを取り付けたことを特徴とする請求項１又は２記載の排気ガス浄化装置。   In the on-vehicle state of the engine, the catalyst case is disposed at a position close to a radiator disposed on one side in the vehicle width direction so that the axial direction thereof is the vehicle vertical direction, and the communication of the catalyst case is performed. The exhaust gas purification device according to claim 1 or 2, wherein the exhaust gas sensor is attached at a position away from the radiator in a circumferential direction of the case portion.
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