WO2023062774A1 - Auxiliary component arrangement structure for vehicle engine - Google Patents

Auxiliary component arrangement structure for vehicle engine Download PDF

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Publication number
WO2023062774A1
WO2023062774A1 PCT/JP2021/038042 JP2021038042W WO2023062774A1 WO 2023062774 A1 WO2023062774 A1 WO 2023062774A1 JP 2021038042 W JP2021038042 W JP 2021038042W WO 2023062774 A1 WO2023062774 A1 WO 2023062774A1
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WIPO (PCT)
Prior art keywords
exhaust
cooling device
passage
engine
exhaust gas
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PCT/JP2021/038042
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French (fr)
Japanese (ja)
Inventor
肇 石井
洋之 木村
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三菱自動車工業株式会社
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Priority to PCT/JP2021/038042 priority Critical patent/WO2023062774A1/en
Publication of WO2023062774A1 publication Critical patent/WO2023062774A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an arrangement structure of a cooling device in an exhaust gas recirculation system of a vehicle engine.
  • the exhaust gas recirculation device has an exhaust gas recirculation passage that communicates the exhaust passage and the intake passage, recirculates part of the exhaust gas from the exhaust passage to the intake passage, lowers the oxygen concentration of the intake air, lowers the temperature in the combustion chamber, and releases the exhaust gas from the engine. Suppress NOx emissions. Furthermore, some have a cooling device in order to suppress an increase in the temperature of the intake air due to the introduction of exhaust gas recirculation. The cooling device is arranged in the exhaust gas recirculation passage and cools the exhaust gas recirculation gas passing through the exhaust gas recirculation passage.
  • the vehicle described in Patent Document 1 is provided with an exhaust manifold on the rear side of the engine mounted horizontally in the vehicle, and is provided with an exhaust purification device extending downward from the exhaust manifold. Furthermore, a cooling device (EGR cooler) is provided adjacent to the exhaust purification device on the rear side of the engine. The cooling system introduces a portion of the exhaust from the downstream side of the exhaust purification system.
  • EGR cooler exhaust purification device
  • the cooling device is provided between the rear surface of the engine and the exhaust purification device, and is arranged so as to extend in the vehicle width direction.
  • the exhaust purification device and the cooling device are arranged side by side on the rear side of the engine, the entire engine unit including auxiliary equipment such as the cooling device becomes long in the longitudinal direction of the vehicle, and the mountability on the vehicle deteriorates. there is a possibility.
  • the present invention has been made in view of such problems, and its object is to arrange a cooling device and an exhaust purification device near the engine while ensuring the cooling performance of the exhaust gas recirculation gas.
  • the accessory arrangement structure for a vehicle engine is an accessory arrangement structure for an engine that is mounted on a vehicle, is equipped with an exhaust purification catalyst in an exhaust passage, and is provided with an exhaust gas recirculation device.
  • the exhaust gas recirculation device includes an exhaust gas recirculation passage for recirculating a part of exhaust gas from the exhaust passage of the engine to an intake passage, and a cooling device interposed in the exhaust gas recirculation passage.
  • the exhaust purification catalyst and the cooling device are arranged offset from each other in the vehicle width direction, and the cooling device is arranged so that the longitudinal direction thereof is in the vehicle width direction, and is aligned with the exhaust purification catalyst. It is preferable that the end portion on the side in the direction in which the exhaust gas is offset is arranged so as to serve as an intake port for the exhaust gas.
  • the cooling device can be easily laid out so as to secure a long exhaust-side passage of the exhaust gas recirculation passage.
  • the exhaust purification catalyst is arranged so as to be inclined in a direction away from the cooling device from the exhaust inlet toward the exhaust outlet.
  • the cooling device and the exhaust gas recirculation passage are separated from the exhaust purification catalyst, and the temperature rise of the exhaust gas recirculated gas due to the temperature rise of the exhaust purification catalyst can be suppressed.
  • the exhaust purification catalyst and the cooling device are arranged at different positions in the vehicle width direction in a rear view of the engine.
  • the cooling device and the exhaust purification catalyst can be largely separated, and the temperature rise of the exhaust gas recirculation gas due to the temperature rise of the exhaust purification catalyst can be greatly suppressed.
  • the exhaust purification catalyst is spaced apart from the rear surface of the engine, and the exhaust gas recirculation passage on the downstream side of the cooling device passes between the exhaust purification catalyst and the rear surface of the engine. preferably extends on the side opposite to the cooling device.
  • the exhaust passage can be compressed between the engine and the exhaust purification catalyst to suppress rearward movement of the exhaust purification catalyst.
  • the device can be arranged compactly.
  • the cooling device is a water-cooled cooler that introduces cooling water to cool the exhaust gas passing through the exhaust gas recirculation passage, and the cooling water passage introduced to the cooling device is connected to the cooling device.
  • the cooling water passage introduced to the cooling device is connected to the cooling device.
  • the cooling water passage introduced into the cooling device cools the exhaust gas recirculation passage, thereby lowering the temperature of the exhaust gas recirculation gas.
  • a long exhaust gas recirculation passage is secured between the exhaust introduction point in the exhaust passage and the cooling device, thereby reducing the temperature of the exhaust gas recirculation gas flowing into the cooling device. Therefore, the intake air temperature of the engine can be further lowered to improve the performance of the exhaust gas recirculation device, and the cooling device can be downsized to downsize the engine unit including the cooling device.
  • FIG. 1 is a schematic configuration diagram of a front portion of a vehicle according to an embodiment of the present invention
  • FIG. FIG. 2 is a layout diagram of engine auxiliaries in a rear view of the engine
  • FIG. 3 is a layout diagram of the engine auxiliary machine in a side view of the engine
  • FIG. 1 is a schematic structural diagram of a front portion of a vehicle 1 that employs an auxiliary machine arrangement structure for an engine 3 according to an embodiment of the present invention.
  • FIG. 2 is a layout diagram of engine auxiliaries in a rear view of the engine 3.
  • FIG. 3 is a layout diagram of engine auxiliaries in a side view of the engine 3.
  • FIG. 1 is a schematic structural diagram of a front portion of a vehicle 1 that employs an auxiliary machine arrangement structure for an engine 3 according to an embodiment of the present invention.
  • FIG. 2 is a layout diagram of engine auxiliaries in a rear view of the engine 3.
  • FIG. 3 is a layout diagram of engine auxiliaries in a side view of the engine 3.
  • FIG. 1 is a schematic structural diagram of a front portion of a vehicle 1 that employs an auxiliary machine arrangement structure for an engine 3 according to an embodiment of the present invention.
  • FIG. 2 is a layout diagram of engine auxiliaries in a rear view of the engine 3.
  • FIG. 3 is
  • a vehicle 1 that employs the present invention is equipped with a power unit 4 including an engine 3 in a front engine room 2 .
  • a vehicle 1 is a plug-in hybrid vehicle capable of EV mode, series mode, and parallel mode.
  • the power unit 4 is equipped with the engine 3, a travel drive motor (not shown), and a power generation motor generator.
  • the travel drive motor and the power generation motor generator are arranged on the left side of the engine 3 .
  • the power generation motor generator is also used as a starter motor for the engine 3 .
  • the engine 3 is, for example, a 4-cylinder engine, and is horizontally mounted on the vehicle 1 .
  • An intake manifold 5 is provided in front of the engine 3, and an intake passage 6 is arranged.
  • an exhaust manifold 7 is provided on the rear side of the engine 3, and an exhaust passage 8 is arranged.
  • a throttle valve 10 is provided in the intake passage 6 .
  • a surge tank 11 is provided between the throttle valve 10 of the intake passage 6 and the intake manifold 5 .
  • the throttle valve 10 is located in the upper part of the front side of the engine 3, and the throttle valve 10 is connected to the branch pipe 12 of the intake manifold 5 connected to the No. 2 cylinder located at the center in the vehicle width direction of the engine 3, and to the No. 3 cylinder. It is arranged between the branch pipe 12 and the branch pipe 12.
  • the surge tank 11 is positioned from the top to the center of the front side of the engine 3 and is arranged below the throttle valve 10 .
  • a branch pipe 12 of the intake manifold 5 is connected from the surge tank 11 toward each cylinder.
  • the branch pipe 12 bends toward the vehicle front side from the lower surface of the surge tank 11, extends upward adjacent to the front side of the surge tank 11, and is connected to an intake port 13 on the upper front surface of each cylinder.
  • the exhaust passage 8 is provided with a front catalyst 20 (exhaust purification catalyst) downstream of the exhaust manifold 7 .
  • a rear catalyst 21 is provided downstream of the front catalyst 20 in the exhaust passage 8 .
  • the front catalyst 20 and the rear catalyst 21 are catalysts capable of purifying exhaust gas, such as three-way catalysts.
  • the front catalyst 20 is relatively small and arranged adjacent to the rear surface 3b of the engine 3 (side surface on the rear side of the vehicle).
  • the front catalyst 20 is arranged near the engine 3 so that the exhaust gas flows immediately from the engine 3 in order to improve the purification performance of the exhaust gas during cold operation such as immediately after starting the engine.
  • the rear catalyst 21 is relatively large and is arranged under the floor of the vehicle 1, for example.
  • the engine 3 is equipped with an exhaust gas recirculation device 30 (EGR device).
  • the exhaust gas recirculation device 30 recirculates part of the exhaust gas to the intake passage 6 to reduce the oxygen concentration of the intake air and suppress the temperature rise in the combustion chamber of the engine 3 . This reduces NOx in the exhaust gas from the engine 3 .
  • the exhaust gas recirculation device 30 includes an exhaust gas recirculation passage 31 (EGR passage) that connects the intake passage 6 and the exhaust passage 8, and an exhaust gas recirculation valve (not shown) that is interposed in the exhaust gas recirculation passage 31 and adjusts the opening degree of the exhaust gas recirculation passage 31. (EGR valve) and a cooling device 32 (EGR cooler) provided in the exhaust gas recirculation passage 31 .
  • EGR passage exhaust gas recirculation passage
  • EGR valve exhaust gas recirculation valve
  • EGR cooler cooling device 32
  • the cooling device 32 is a water-cooled cooler that lowers the temperature of the exhaust gas (exhaust gas recirculation gas) passing through the exhaust gas recirculation passage 31 .
  • the cooling device 32 further suppresses an increase in the temperature of the intake air into which the exhaust gas recirculation is introduced, thereby improving the NOx reduction effect of the exhaust gas recirculation device 30 .
  • the front catalyst 20 is positioned behind the rear surface 3b of the engine 3 across the exhaust manifold 7, and slightly leftward from the center position of the engine 3 in the left-right direction.
  • the front catalyst 20 is formed in a substantially cylindrical shape, and has an exhaust inlet 20a connected to the exhaust manifold 7 at one end and an exhaust outlet 20b at the other end.
  • the front catalyst 20 is disposed downwardly and rearwardly of the vehicle from the exhaust inlet 20a toward the exhaust outlet 20b.
  • the front catalyst 20 is arranged slightly inclined leftward in the vehicle width direction from the exhaust inlet 20a toward the exhaust outlet 20b.
  • the exhaust manifold 7 has a branch pipe 36 extending rearward from an exhaust port 35 of each cylinder positioned on the upper portion of the rear surface 3b of the engine 3, bends downward and merges, and is connected to the exhaust inlet 20a of the front catalyst 20. are doing.
  • the cooling device 32 is formed, for example, in a cylindrical shape, and has a gas inlet 32a (exhaust intake) provided at one end to a gas outlet 32b (exhaust outlet) provided at the other end. It is configured so that the exhaust gas recirculation gas passes therethrough. Also, part of the cooling water for cooling the engine 3 is introduced into the cooling device 32, and heat is exchanged between the exhaust gas recirculation gas and the cooling water to cool the exhaust gas recirculation gas.
  • the cooling device 32 is located on the right side of the front catalyst 20 in the vehicle width direction and is arranged to extend in the vehicle width direction.
  • the cooling device 32 has a gas inlet 32a, which is an inlet for recirculated exhaust gas, located on the right side of the engine 3 in the vehicle width direction, and a gas outlet 32b located substantially in the center of the engine 3 in the vehicle width direction.
  • the cooling device 32 is arranged between the rear surface 3b of the engine 3 and the front catalyst 20 in the longitudinal direction of the vehicle.
  • the exhaust gas recirculation passage 31 is a hollow pipe extending rightward in the vehicle width direction and forward of the vehicle from an exhaust gas introduction port 20c near the exhaust outlet 20b of the front catalyst 20 and connected to a gas inlet 32a of the cooling device 32. (exhaust side passage 31a).
  • the exhaust gas recirculation passage 31 extends from the gas outlet 32b of the cooling device 32 toward the left side in the vehicle width direction between the rear surface of the engine 3 and the front catalyst 20, and extends upward on the left side of the front catalyst 20 in the vehicle width direction.
  • a cooling water passage for introducing cooling water to the cooling device 32 includes a cooling water introduction passage 40 that passes through the right side surface of the engine 3 from the front to the rear and is connected to the cooling device 32.
  • a cooling water discharge passage 41 (cooling water passage) extending leftward in the vehicle width direction along the rear surface of the engine 3 is provided.
  • the cooling water discharge passage 41 passes through the space between the exhaust manifold 7 and the exhaust recirculation passage 31 and extends along the exhaust recirculation passage 31 extending from the gas outlet 32 b of the cooling device 32 .
  • the exhaust gas recirculation passage 31 and the cooling water discharge passage 41 on the downstream side of the cooling device 32 are preferably arranged adjacent to each other so as to facilitate heat exchange.
  • the front catalyst 20 and the cooling device 32 are provided on the side of the rear surface 3b of the engine 3 mounted horizontally in the vehicle 1. As shown in FIG. 2 , the front catalyst 20 and the cooling device 32 are arranged so as not to overlap when viewed from the rear of the engine 3 .
  • the front-to-rear dimensions of the engine unit including the auxiliary equipment of the engine 3 such as the front catalyst 20 and the cooling device 32, can be reduced to make the engine unit compact, and the mountability of the vehicle can be improved. Further, by configuring the engine unit compactly in the longitudinal direction of the vehicle, a large crushable space can be secured behind the engine 3 in the event of a frontal collision of the vehicle.
  • the front catalyst 20 and the cooling device 32 are cooled when the engine 3 is pushed rearward in the event of a frontal collision of the vehicle. Contact with the device 32 can be avoided.
  • the branch pipe 36 of the exhaust manifold 7 can be bent to absorb the impact, and the projection of the front catalyst 20 to the rear of the vehicle can be suppressed.
  • the exhaust gas recirculation passage 31 located between the front catalyst 20 and the rear surface of the engine 3 is a hollow pipe and is more likely to be crushed than the cooling device 32.
  • the exhaust gas recirculation passage 31 is crushed and can absorb the impact.
  • the front catalyst 20 is positioned on the left side in the vehicle width direction
  • the cooling device 32 is positioned on the right side in the vehicle width direction, and are arranged along the rear surface 3b of the engine 3 so as to be offset from each other in the vehicle width direction.
  • a gas inlet 32a of the device 32 is located on the right side of the cooling device 32 in the vehicle width direction.
  • the cooling device 32 is arranged so that all parts thereof are located on the right side in the vehicle width direction with respect to the front catalyst 20, that is, in different positions in the vehicle width direction.
  • the distance between the gas inlet 32a of the cooling device 32 and the exhaust inlet 20c is longer than the distance between the gas outlet 32b and the exhaust inlet 20c. It is possible to secure a long exhaust side passage 31 a between them, that is, the exhaust gas recirculation passage 31 between the point where the exhaust gas is introduced from the exhaust passage 8 and the cooling device 32 . Therefore, in the exhaust gas recirculation passage 31 between the exhaust passage 8 and the cooling device 32, the temperature of the exhaust gas recirculated can be greatly reduced. As a result, the intake air temperature of the engine 3 can be further lowered to improve the performance of the exhaust gas recirculation system, and the cooling device 32 can be downsized to further improve the mountability of the engine unit including the cooling device 32 on the vehicle 1. can.
  • the cooling device 32 is arranged such that its longitudinal direction is the vehicle width direction, and the right end portion in the vehicle width direction, which is the far side in the vehicle width direction with respect to the front catalyst 20, serves as the gas inlet 32a. It's becoming In this embodiment, the gas inlet 32 a of the cooling device 32 is located on the offset direction side of the cooling device 32 with respect to the front catalyst 20 .
  • the cooling device 32 can be easily laid out so as to secure a long exhaust gas recirculation passage 31 between the exhaust passage 8 and the cooling device 32 .
  • the front catalyst 20 is arranged to be inclined leftward in the vehicle width direction and rearward of the vehicle from the exhaust inlet 20a toward the exhaust outlet 20b, that is, in a direction away from the cooling device 32. ing. As a result, the cooling device 32 and the front catalyst 20 are separated from each other, and the temperature rise of the exhaust gas recirculation gas due to the temperature rise of the front catalyst 20 can be suppressed.
  • a part of the cooling water discharge passage 41 that has passed through the cooling device 32 passes through the space between the exhaust manifold 7 and the exhaust gas recirculation passage 31, and also to the exhaust gas recirculation passage 31 downstream of the cooling device 32. They are arranged so as to extend adjacently. As a result, the cooling water passing through the cooling water discharge passage 41 can cool the exhaust gas recirculation passage 31 and further reduce the temperature of the exhaust gas recirculation gas.
  • cooling water discharge passage 41 is arranged in the space between the exhaust manifold 7 and the exhaust gas recirculation passage 31 , it has the effect of making it difficult for the heat of the exhaust manifold 7 to be transmitted to the exhaust gas recirculation passage 31 .
  • the present invention is not limited to the above embodiments.
  • the front catalyst 20 and the cooling device 32 are arranged so as not to completely overlap when viewed from the rear of the vehicle, but they may partially overlap.
  • the front catalyst 20 and the cooling device 32 are arranged offset from each other in the vehicle width direction along the rear surface 3b of the engine 3, but they may be offset from each other in the vertical direction or in the vertical, left, right, and oblique directions, for example.
  • the cooling device 32 may be arranged along the rear surface of the engine 3, for example, inclined in the vertical direction or in the vertical, horizontal, and horizontal directions. Even in such a case, by setting the gas inlet 32a in the cooling device 32 farther from the exhaust passage 8 on the downstream side of the front catalyst 20, the exhaust gas recirculation passage 31 can be lengthened and the temperature of the exhaust gas recirculated can be reduced. can be encouraged.
  • a portion of the cooling water discharge passage 41 that has passed through the cooling device 32 is arranged to extend adjacent to the exhaust gas recirculation passage 31 downstream of the cooling device 32.
  • At least part of cooling water introduction passage 40 for introducing cooling water and exhaust gas recirculation passage 31 may be arranged so as to extend adjacent to each other.
  • the present invention is applied to the engine 3 mounted on a plug-in hybrid vehicle, but it can also be applied to an engine mounted on a hybrid vehicle or a gasoline vehicle, or an engine other than a vehicle.
  • INDUSTRIAL APPLICABILITY The present invention can be widely applied to vehicle engines having a cooling device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Provided is an auxiliary component arrangement structure for an engine 3 that is installed in a vehicle, comprises a front catalyst 20 provided to an exhaust passage 8, and comprises an exhaust gas recirculation device, wherein: the exhaust gas recirculation device comprises an exhaust gas recirculation passage 31 for recirculating some of the exhaust from the exhaust passage 8 of the engine 3 to an air intake passage, and a cooling device 32 interposed in the exhaust gas recirculation passage 31; the exhaust gas recirculation passage 31 has an exhaust-side passage 32b connecting a gas intake 32a of the cooling device 32 and an exhaust inlet 20c that is provided to the exhaust passage 8 on the downstream side of the front catalyst 20 ; the front catalyst 20 and the cooling device 32 are arranged offset from one another in the vehicle width direction along the rear surface of the engine 3; and the distance between the gas intake 32a and the exhaust inlet 20c is greater than the distance between a gas outlet 32b of the cooling device 32 and the exhaust inlet 20c.

Description

車両用エンジンの補機配置構造Vehicle engine accessory layout structure
　本発明は車両のエンジンの排気還流装置における冷却装置の配置構造に関する。 The present invention relates to an arrangement structure of a cooling device in an exhaust gas recirculation system of a vehicle engine.
　車両に搭載されたエンジンの多くには、排気性能を向上させるために、排気還流装置が備えられている。排気還流装置は、排気通路と吸気通路とを連通する排気還流通路を備え、排気通路から排気の一部を吸気通路に還流し、吸気の酸素濃度を低下させ燃焼室内の温度を低下しエンジンからＮＯｘの排出を抑制する。更に、排気還流ガスを導入することによる吸気温度の上昇を抑えるために冷却装置を備えたものもある。冷却装置は、排気還流通路に配置され、排気還流通路を通過する排気還流ガスを冷却する。 Many of the engines installed in vehicles are equipped with an exhaust gas recirculation system to improve exhaust performance. The exhaust gas recirculation device has an exhaust gas recirculation passage that communicates the exhaust passage and the intake passage, recirculates part of the exhaust gas from the exhaust passage to the intake passage, lowers the oxygen concentration of the intake air, lowers the temperature in the combustion chamber, and releases the exhaust gas from the engine. Suppress NOx emissions. Furthermore, some have a cooling device in order to suppress an increase in the temperature of the intake air due to the introduction of exhaust gas recirculation. The cooling device is arranged in the exhaust gas recirculation passage and cools the exhaust gas recirculation gas passing through the exhaust gas recirculation passage.
　特許文献１に記載された車両には、車両に横置きに搭載されたエンジンの後方側に排気マニホールドが備えられ、排気マニホールドから下方に向かって延びるように排気浄化装置が備えられている。更に、エンジンの後方側に排気浄化装置に隣接して冷却装置（ＥＧＲクーラー）が備えられている。冷却装置は排気浄化装置の下流側から排気の一部を導入している。 The vehicle described in Patent Document 1 is provided with an exhaust manifold on the rear side of the engine mounted horizontally in the vehicle, and is provided with an exhaust purification device extending downward from the exhaust manifold. Furthermore, a cooling device (EGR cooler) is provided adjacent to the exhaust purification device on the rear side of the engine. The cooling system introduces a portion of the exhaust from the downstream side of the exhaust purification system.
特許第５７１９３７６号公報Japanese Patent No. 5719376
　特許文献１において冷却装置は、エンジンの後面と排気浄化装置との間に設けられ、車幅方向に延びるように配置されている。しかしながら、エンジンの後面側に排気浄化装置と冷却装置とが並んで配置されているので、冷却装置等の補機を含むエンジンユニット全体が車両前後方向に長くなり、車両への搭載性が低下する可能性がある。
　これに対し、冷却装置の容量を抑え小型化することで、補機を含むエンジンユニット全体をコンパクト化することが可能であるが、排気還流ガスの冷却性が低下するといった問題点がある。 In Patent Document 1, the cooling device is provided between the rear surface of the engine and the exhaust purification device, and is arranged so as to extend in the vehicle width direction. However, since the exhaust purification device and the cooling device are arranged side by side on the rear side of the engine, the entire engine unit including auxiliary equipment such as the cooling device becomes long in the longitudinal direction of the vehicle, and the mountability on the vehicle deteriorates. there is a possibility.
On the other hand, it is possible to reduce the size of the entire engine unit, including the auxiliary equipment, by reducing the capacity of the cooling device and downsizing it.
　本発明はこのような課題に鑑みてなされたものであり、その目的とするところは、排気還流ガスの冷却性を確保しつつ、冷却装置及び排気浄化装置をエンジンの傍に配置してコンパクトに構成できる車両用エンジンの補機配置構造を提供することにある。 The present invention has been made in view of such problems, and its object is to arrange a cooling device and an exhaust purification device near the engine while ensuring the cooling performance of the exhaust gas recirculation gas. To provide a configurable vehicle engine accessory arrangement structure.
　上記目的を達成するため、本発明に係る車両用エンジンの補機配置構造は、車両に搭載され、排気通路に排気浄化触媒が備えられるとともに、排気還流装置を備えたエンジンの補機配置構造であって、前記排気還流装置は、前記エンジンの排気通路から排気の一部を吸気通路に還流する排気還流通路と、前記排気還流通路に介装された冷却装置と、を備え、前記排気還流通路は、前記排気浄化触媒の下流側の前記排気通路に設けられた排気導入口と前記冷却装置の排気の取入口とを接続する排気側通路と、前記吸気通路と前記冷却装置の排気の排出口とを接続する吸気側通路を有し、前記冷却装置は、前記排気の取入口と前記排気導入口との距離が、前記排気の排出口と前記排気導入口との距離より長くなるように配置されていることを特徴とする。 In order to achieve the above object, the accessory arrangement structure for a vehicle engine according to the present invention is an accessory arrangement structure for an engine that is mounted on a vehicle, is equipped with an exhaust purification catalyst in an exhaust passage, and is provided with an exhaust gas recirculation device. The exhaust gas recirculation device includes an exhaust gas recirculation passage for recirculating a part of exhaust gas from the exhaust passage of the engine to an intake passage, and a cooling device interposed in the exhaust gas recirculation passage. comprises an exhaust side passage connecting an exhaust introduction port provided in the exhaust passage on the downstream side of the exhaust purification catalyst and an exhaust intake port of the cooling device, and an exhaust port of the intake passage and the cooling device; and the cooling device is arranged such that the distance between the exhaust inlet and the exhaust inlet is longer than the distance between the exhaust outlet and the exhaust inlet. It is characterized by being
　これにより、排気通路の排気導入口から冷却装置の排気の取入口までの排気側通路を長く確保することができ、冷却装置に流入する排気還流ガスの温度を低下させることができる。 As a result, a long exhaust side passage from the exhaust inlet of the exhaust passage to the exhaust inlet of the cooling device can be secured, and the temperature of the exhaust recirculated gas flowing into the cooling device can be lowered.
　好ましくは、前記排気浄化触媒及び前記冷却装置は、車幅方向に互いにオフセットして配置され、前記冷却装置は、長手方向が車幅方向になるように配置されるとともに、前記排気浄化触媒に対してオフセットしている方向側の端部が前記排気の取入口となるように配置されているとよい。 Preferably, the exhaust purification catalyst and the cooling device are arranged offset from each other in the vehicle width direction, and the cooling device is arranged so that the longitudinal direction thereof is in the vehicle width direction, and is aligned with the exhaust purification catalyst. It is preferable that the end portion on the side in the direction in which the exhaust gas is offset is arranged so as to serve as an intake port for the exhaust gas.
　これにより、排気浄化触媒と冷却装置とが、エンジンの後方で車両前後方向に重なることを抑制することができる。したがって、排気浄化触媒及び冷却装置を含むエンジンユニットの前後寸法を抑えて車両の搭載性を向上させることができる。
　また、排気還流通路の排気側通路を長く確保するように冷却装置を容易にレイアウトすることができる。 As a result, it is possible to prevent the exhaust purification catalyst and the cooling device from overlapping in the vehicle front-rear direction behind the engine. Therefore, it is possible to reduce the front-to-rear dimensions of the engine unit including the exhaust gas purification catalyst and the cooling device, thereby improving the mountability of the vehicle.
Also, the cooling device can be easily laid out so as to secure a long exhaust-side passage of the exhaust gas recirculation passage.
　好ましくは、前記排気浄化触媒は、排気入口から排気出口に向かって前記冷却装置と離間する方向に傾斜して配置されているとよい。 Preferably, the exhaust purification catalyst is arranged so as to be inclined in a direction away from the cooling device from the exhaust inlet toward the exhaust outlet.
　これにより、冷却装置及び排気還流通路と排気浄化触媒とを離間させ、排気浄化触媒の温度上昇に伴う排気還流ガスの温度上昇を抑制することができる。 As a result, the cooling device and the exhaust gas recirculation passage are separated from the exhaust purification catalyst, and the temperature rise of the exhaust gas recirculated gas due to the temperature rise of the exhaust purification catalyst can be suppressed.
　好ましくは、前記排気浄化触媒と前記冷却装置とは、前記エンジンの後面視において、車幅方向で全ての部位が互いに異なる位置に配置されているとよい。 Preferably, the exhaust purification catalyst and the cooling device are arranged at different positions in the vehicle width direction in a rear view of the engine.
　これにより、冷却装置と排気浄化触媒とを大きく離間させ、排気浄化触媒の温度上昇に伴う排気還流ガスの温度上昇を大幅に抑制することができる。 As a result, the cooling device and the exhaust purification catalyst can be largely separated, and the temperature rise of the exhaust gas recirculation gas due to the temperature rise of the exhaust purification catalyst can be greatly suppressed.
　好ましくは、前記排気浄化触媒は、前記エンジンの後面に対して離間して配置され、前記冷却装置の下流側の前記排気還流通路は、前記排気浄化触媒と前記エンジンの後面との間を通過して前記冷却装置とは反対側に延びるとよい。 Preferably, the exhaust purification catalyst is spaced apart from the rear surface of the engine, and the exhaust gas recirculation passage on the downstream side of the cooling device passes between the exhaust purification catalyst and the rear surface of the engine. preferably extends on the side opposite to the cooling device.
　これにより、車両の衝突時にエンジンが車両後方へ押された場合に、エンジンと排気浄化触媒との間で排気通路を圧縮して排気浄化触媒の後方への移動を抑制することができるとともに、冷却装置をコンパクトに配置することができる。 As a result, when the engine is pushed rearward during a vehicle collision, the exhaust passage can be compressed between the engine and the exhaust purification catalyst to suppress rearward movement of the exhaust purification catalyst. The device can be arranged compactly.
　好ましくは、前記冷却装置は、冷却水を導入して前記排気還流通路を通過する排気を冷却する水冷式の冷却器であり、前記冷却装置へ導入される前記冷却水の通路は、前記冷却装置の上流側及び下流側の少なくとも一方で前記排気還流通路に隣接して延びるように配置されているとよい。 Preferably, the cooling device is a water-cooled cooler that introduces cooling water to cool the exhaust gas passing through the exhaust gas recirculation passage, and the cooling water passage introduced to the cooling device is connected to the cooling device. may be arranged so as to extend adjacent to the exhaust gas recirculation passage on at least one of the upstream side and the downstream side of the exhaust gas recirculation passage.
　これにより、冷却装置へ導入される冷却水の通路によって、排気還流通路を冷却して、排気還流ガスの温度を低下させることができる。 As a result, the cooling water passage introduced into the cooling device cools the exhaust gas recirculation passage, thereby lowering the temperature of the exhaust gas recirculation gas.
　本発明に係る車両用エンジンの補機配置構造によれば、排気通路における排気導入箇所と冷却装置との間の排気還流通路を長く確保して、冷却装置に流入する排気還流ガスの温度を低下させることができるので、エンジンの吸気温度をより低下させて排気還流装置の性能向上を図るとともに、冷却装置を小型化して冷却装置を含むエンジンユニットを小型化することができる。 According to the accessory arrangement structure for a vehicle engine according to the present invention, a long exhaust gas recirculation passage is secured between the exhaust introduction point in the exhaust passage and the cooling device, thereby reducing the temperature of the exhaust gas recirculation gas flowing into the cooling device. Therefore, the intake air temperature of the engine can be further lowered to improve the performance of the exhaust gas recirculation device, and the cooling device can be downsized to downsize the engine unit including the cooling device.
本発明の実施形態に係る車両の前部の概略構成図である。1 is a schematic configuration diagram of a front portion of a vehicle according to an embodiment of the present invention; FIG. エンジンの後面視におけるエンジン補機のレイアウト図である。FIG. 2 is a layout diagram of engine auxiliaries in a rear view of the engine; エンジンの側面視におけるエンジン補機のレイアウト図である。FIG. 3 is a layout diagram of the engine auxiliary machine in a side view of the engine;
　以下、図面に基づき本発明の実施形態について説明する。
　図１は、本発明の実施形態に係るエンジン３の補機配置構造を採用した車両１の前部の概略構造図である。図２は、エンジン３の後面視におけるエンジン補機のレイアウト図である。図３は、エンジン３の側面視におけるエンジン補機のレイアウト図である。 An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic structural diagram of a front portion of a vehicle 1 that employs an auxiliary machine arrangement structure for an engine 3 according to an embodiment of the present invention. FIG. 2 is a layout diagram of engine auxiliaries in a rear view of the engine 3. As shown in FIG. FIG. 3 is a layout diagram of engine auxiliaries in a side view of the engine 3. As shown in FIG.
　図１に示すように、本発明を採用した車両１は、前部のエンジンルーム２にエンジン３を含むパワーユニット４を搭載している。車両１は、ＥＶモード、シリーズモード、パラレルモードが可能なプラグインハイブリッド車である。 As shown in FIG. 1, a vehicle 1 that employs the present invention is equipped with a power unit 4 including an engine 3 in a front engine room 2 . A vehicle 1 is a plug-in hybrid vehicle capable of EV mode, series mode, and parallel mode.
　パワーユニット４は、エンジン３と図示しない走行駆動用モータ及び発電用モータジェネレータを備えている。走行駆動用モータ及び発電用モータジェネレータは、エンジン３の左側方に配置されている。発電用モータジェネレータは、エンジン３のスタータモータとしても使用される。 The power unit 4 is equipped with the engine 3, a travel drive motor (not shown), and a power generation motor generator. The travel drive motor and the power generation motor generator are arranged on the left side of the engine 3 . The power generation motor generator is also used as a starter motor for the engine 3 .
　エンジン３は、例えば４気筒であり、車両１に横置きに搭載されている。エンジン３の前面に吸気マニホールド５が備えられ、吸気通路６が配置されている。一方、エンジン３の後面側に排気マニホールド７が備えられ、排気通路８が配置されている。 The engine 3 is, for example, a 4-cylinder engine, and is horizontally mounted on the vehicle 1 . An intake manifold 5 is provided in front of the engine 3, and an intake passage 6 is arranged. On the other hand, an exhaust manifold 7 is provided on the rear side of the engine 3, and an exhaust passage 8 is arranged.
　吸気通路６には、スロットルバルブ１０が備えられている。また、吸気通路６のスロットルバルブ１０と吸気マニホールド５との間には、サージタンク１１が備えられている。 A throttle valve 10 is provided in the intake passage 6 . A surge tank 11 is provided between the throttle valve 10 of the intake passage 6 and the intake manifold 5 .
　スロットルバルブ１０は、エンジン３の前面側の上部に位置し、スロットルバルブ１０はエンジン３の車幅方向中央部に位置する２番気筒に連結する吸気マニホールド５のブランチ管１２と３番気筒に連結するブランチ管１２との間に配置されている。 The throttle valve 10 is located in the upper part of the front side of the engine 3, and the throttle valve 10 is connected to the branch pipe 12 of the intake manifold 5 connected to the No. 2 cylinder located at the center in the vehicle width direction of the engine 3, and to the No. 3 cylinder. It is arranged between the branch pipe 12 and the branch pipe 12.
　サージタンク１１は、エンジン３の前面側の上部から中央部に位置し、スロットルバルブ１０の下方に配置されている。サージタンク１１から各気筒に向けて吸気マニホールド５のブランチ管１２が夫々接続されている。ブランチ管１２はサージタンク１１の下面から車両前側に屈曲しサージタンク１１の前側に隣接して上方に延び、各気筒の上部前面の吸気ポート１３に接続されている。 The surge tank 11 is positioned from the top to the center of the front side of the engine 3 and is arranged below the throttle valve 10 . A branch pipe 12 of the intake manifold 5 is connected from the surge tank 11 toward each cylinder. The branch pipe 12 bends toward the vehicle front side from the lower surface of the surge tank 11, extends upward adjacent to the front side of the surge tank 11, and is connected to an intake port 13 on the upper front surface of each cylinder.
　一方、排気通路８には、排気マニホールド７の下流側にフロント触媒２０（排気浄化触媒）が備えられている。また、排気通路８のフロント触媒２０より下流側にリヤ触媒２１が備えられている。フロント触媒２０及びリヤ触媒２１は、例えば三元触媒のような排気を浄化可能な触媒である。フロント触媒２０は比較的小型であり、エンジン３の後面３ｂ（車両後方側側面）に隣接して配置されている。フロント触媒２０は、エンジン始動直後のような冷態運転時において排気の浄化性能を向上させるために、エンジン３からすぐに排気が流入するようにエンジン３の近くに配置されている。リヤ触媒２１は比較的大型であり、例えば車両１のフロア下に配置されている。 On the other hand, the exhaust passage 8 is provided with a front catalyst 20 (exhaust purification catalyst) downstream of the exhaust manifold 7 . A rear catalyst 21 is provided downstream of the front catalyst 20 in the exhaust passage 8 . The front catalyst 20 and the rear catalyst 21 are catalysts capable of purifying exhaust gas, such as three-way catalysts. The front catalyst 20 is relatively small and arranged adjacent to the rear surface 3b of the engine 3 (side surface on the rear side of the vehicle). The front catalyst 20 is arranged near the engine 3 so that the exhaust gas flows immediately from the engine 3 in order to improve the purification performance of the exhaust gas during cold operation such as immediately after starting the engine. The rear catalyst 21 is relatively large and is arranged under the floor of the vehicle 1, for example.
　更に、エンジン３には、排気還流装置３０（ＥＧＲ装置）が備えられている。排気還流装置３０は、排気の一部を吸気通路６に還流することで、吸気の酸素濃度を低下させてエンジン３の燃焼室内の温度上昇を抑える。これにより、エンジン３の排気中におけるＮＯｘを低減させる。 Furthermore, the engine 3 is equipped with an exhaust gas recirculation device 30 (EGR device). The exhaust gas recirculation device 30 recirculates part of the exhaust gas to the intake passage 6 to reduce the oxygen concentration of the intake air and suppress the temperature rise in the combustion chamber of the engine 3 . This reduces NOx in the exhaust gas from the engine 3 .
　排気還流装置３０は、吸気通路６と排気通路８とを接続する排気還流通路３１（ＥＧＲ通路）と、排気還流通路３１に介装され排気還流通路３１の開度を調節する図示しない排気還流バルブ（ＥＧＲバルブ）と、排気還流通路３１に備えられた冷却装置３２（ＥＧＲクーラー）を有している。 The exhaust gas recirculation device 30 includes an exhaust gas recirculation passage 31 (EGR passage) that connects the intake passage 6 and the exhaust passage 8, and an exhaust gas recirculation valve (not shown) that is interposed in the exhaust gas recirculation passage 31 and adjusts the opening degree of the exhaust gas recirculation passage 31. (EGR valve) and a cooling device 32 (EGR cooler) provided in the exhaust gas recirculation passage 31 .
　冷却装置３２は、排気還流通路３１を通過する排気（排気還流ガス)の温度を低下させる水冷式の冷却器である。冷却装置３２は、排気還流ガスの温度を低下させることで、排気還流ガスを導入した吸気の温度の上昇を更に抑え、排気還流装置３０によるＮＯｘ低減効果を向上させる。 The cooling device 32 is a water-cooled cooler that lowers the temperature of the exhaust gas (exhaust gas recirculation gas) passing through the exhaust gas recirculation passage 31 . By lowering the temperature of the exhaust gas recirculation, the cooling device 32 further suppresses an increase in the temperature of the intake air into which the exhaust gas recirculation is introduced, thereby improving the NOx reduction effect of the exhaust gas recirculation device 30 .
　図２、３に示すように、フロント触媒２０は、エンジン３の後面３ｂから排気マニホールド７を挟んで後方に位置し、エンジン３の左右方向中央位置からやや左側に配置されている。 As shown in FIGS. 2 and 3, the front catalyst 20 is positioned behind the rear surface 3b of the engine 3 across the exhaust manifold 7, and slightly leftward from the center position of the engine 3 in the left-right direction.
　フロント触媒２０は、略円筒状に形成されており、一端側に排気マニホールド７に接続された排気入口２０ａが設けられ、他端側に排気出口２０ｂが設けられている。
　フロント触媒２０は、排気入口２０ａから排気出口２０ｂに向かって下方かつ車両後方に傾斜して配置されている。また、フロント触媒２０は、排気入口２０ａから排気出口２０ｂに向かって車幅方向左側に僅かに傾斜して配置されている。 The front catalyst 20 is formed in a substantially cylindrical shape, and has an exhaust inlet 20a connected to the exhaust manifold 7 at one end and an exhaust outlet 20b at the other end.
The front catalyst 20 is disposed downwardly and rearwardly of the vehicle from the exhaust inlet 20a toward the exhaust outlet 20b. In addition, the front catalyst 20 is arranged slightly inclined leftward in the vehicle width direction from the exhaust inlet 20a toward the exhaust outlet 20b.
　排気マニホールド７は、エンジン３の後面３ｂの上部に位置する各気筒の排気ポート３５から後方に延びるとともに下方に屈曲して合流し、フロント触媒２０の排気入口２０ａに接続されるブランチ管３６を有している。 The exhaust manifold 7 has a branch pipe 36 extending rearward from an exhaust port 35 of each cylinder positioned on the upper portion of the rear surface 3b of the engine 3, bends downward and merges, and is connected to the exhaust inlet 20a of the front catalyst 20. are doing.
　冷却装置３２は、例えば筒状に形成されており、一方の端部に設けられたガス入口３２ａ（排気の取入口）から他方の端部に設けられたガス出口３２ｂ（排気の排出口）に向かって排気還流ガスが通過するように構成されている。また、冷却装置３２には、エンジン３冷却用の冷却水の一部が導入され、排気還流ガスと冷却水とが熱交換して排気還流ガスを冷却する。 The cooling device 32 is formed, for example, in a cylindrical shape, and has a gas inlet 32a (exhaust intake) provided at one end to a gas outlet 32b (exhaust outlet) provided at the other end. It is configured so that the exhaust gas recirculation gas passes therethrough. Also, part of the cooling water for cooling the engine 3 is introduced into the cooling device 32, and heat is exchanged between the exhaust gas recirculation gas and the cooling water to cool the exhaust gas recirculation gas.
　冷却装置３２はフロント触媒２０の車幅方向右側に位置し、車幅方向に延びるように配置されている。冷却装置３２は、排気還流ガスの取入口であるガス入口３２ａがエンジン３の車幅方向右側に位置し、ガス出口３２ｂがエンジン３の車幅方向略中央に位置している。また、冷却装置３２は、エンジン３の後面３ｂとフロント触媒２０との間の車両前後方向位置に配置されている。 The cooling device 32 is located on the right side of the front catalyst 20 in the vehicle width direction and is arranged to extend in the vehicle width direction. The cooling device 32 has a gas inlet 32a, which is an inlet for recirculated exhaust gas, located on the right side of the engine 3 in the vehicle width direction, and a gas outlet 32b located substantially in the center of the engine 3 in the vehicle width direction. The cooling device 32 is arranged between the rear surface 3b of the engine 3 and the front catalyst 20 in the longitudinal direction of the vehicle.
　排気還流通路３１は、中空状のパイプであって、フロント触媒２０の排気出口２０ｂの近傍の排気導入口２０ｃから車幅方向右側かつ車両前方に延びて冷却装置３２のガス入口３２aに接続されている（排気側通路３１ａ）。また、排気還流通路３１は、冷却装置３２のガス出口３２ｂから、エンジン３の後面とフロント触媒２０との間を車幅方向左側に向かって延び、フロント触媒２０の車幅方向左側で上方に延びてエンジン３の前側に回り込み、図示しない排気還流バルブを通過して、スロットルバルブ１０とサージタンク１１との間の吸気通路６に接続されている（吸気側通路３１ｂ）。 The exhaust gas recirculation passage 31 is a hollow pipe extending rightward in the vehicle width direction and forward of the vehicle from an exhaust gas introduction port 20c near the exhaust outlet 20b of the front catalyst 20 and connected to a gas inlet 32a of the cooling device 32. (exhaust side passage 31a). The exhaust gas recirculation passage 31 extends from the gas outlet 32b of the cooling device 32 toward the left side in the vehicle width direction between the rear surface of the engine 3 and the front catalyst 20, and extends upward on the left side of the front catalyst 20 in the vehicle width direction. The air flows around the front side of the engine 3, passes through an exhaust gas recirculation valve (not shown), and is connected to the intake passage 6 between the throttle valve 10 and the surge tank 11 (intake side passage 31b).
　また、冷却装置３２に冷却水を導入するための冷却水路は、エンジン３の前部から右側面を通過して後方に回り込み冷却装置３２に接続された冷却水導入路４０と、冷却装置３２からエンジン３の後面に沿って車幅方向左方に延びる冷却水排出路４１（冷却水の通路）を備えている。冷却水排出路４１は、排気マニホールド７と排気還流通路３１の間の空間を通るとともに、冷却装置３２のガス出口３２ｂから延びる排気還流通路３１に沿って延びている。なお、冷却装置３２より下流側の排気還流通路３１と冷却水排出路４１とは、互いに熱交換し易いように隣接して配置されるとよい。 In addition, a cooling water passage for introducing cooling water to the cooling device 32 includes a cooling water introduction passage 40 that passes through the right side surface of the engine 3 from the front to the rear and is connected to the cooling device 32. A cooling water discharge passage 41 (cooling water passage) extending leftward in the vehicle width direction along the rear surface of the engine 3 is provided. The cooling water discharge passage 41 passes through the space between the exhaust manifold 7 and the exhaust recirculation passage 31 and extends along the exhaust recirculation passage 31 extending from the gas outlet 32 b of the cooling device 32 . The exhaust gas recirculation passage 31 and the cooling water discharge passage 41 on the downstream side of the cooling device 32 are preferably arranged adjacent to each other so as to facilitate heat exchange.
　以上のように、本実施形態では、車両１に横置きに搭載されたエンジン３の後面３ｂ側に、フロント触媒２０及び冷却装置３２が備えられている。図２に示すように、フロント触媒２０と冷却装置３２とは、エンジン３の後面視で重ならないように配置されている。 As described above, in the present embodiment, the front catalyst 20 and the cooling device 32 are provided on the side of the rear surface 3b of the engine 3 mounted horizontally in the vehicle 1. As shown in FIG. 2 , the front catalyst 20 and the cooling device 32 are arranged so as not to overlap when viewed from the rear of the engine 3 .
　このような構成により、フロント触媒２０及び冷却装置３２といったエンジン３の補機を含むエンジンユニットの前後寸法を抑えてコンパクトに構成し、車両の搭載性を向上させることができる。また、エンジンユニットを車両前後方向にコンパクトに構成することで、車両前突時においてエンジン３の後方にクラッシャブルスペースを大きく確保することができる。 With this configuration, the front-to-rear dimensions of the engine unit, including the auxiliary equipment of the engine 3 such as the front catalyst 20 and the cooling device 32, can be reduced to make the engine unit compact, and the mountability of the vehicle can be improved. Further, by configuring the engine unit compactly in the longitudinal direction of the vehicle, a large crushable space can be secured behind the engine 3 in the event of a frontal collision of the vehicle.
　また、フロント触媒２０と冷却装置３２とが、エンジン３の後面視で重ならないように配置されることで、車両前突時にエンジン３が後方に向かって押された場合に、フロント触媒２０と冷却装置３２とが接触することを回避することができる。これにより車両前突時に、例えば排気マニホールド７のブランチ管３６が屈曲して衝撃を吸収できるとともに、フロント触媒２０の車両後方への突出を抑制することができる。 In addition, by arranging the front catalyst 20 and the cooling device 32 so as not to overlap each other when viewed from the rear of the engine 3, the front catalyst 20 and the cooling device 32 are cooled when the engine 3 is pushed rearward in the event of a frontal collision of the vehicle. Contact with the device 32 can be avoided. As a result, in the event of a frontal collision of the vehicle, for example, the branch pipe 36 of the exhaust manifold 7 can be bent to absorb the impact, and the projection of the front catalyst 20 to the rear of the vehicle can be suppressed.
　フロント触媒２０とエンジン３の後面との間に位置する排気還流通路３１は、中空状のパイプであり冷却装置３２よりも潰れ易いので、車両前突時にエンジン３が後方に移動した際に、フロント触媒２０とエンジン３の後面３ｂとの間に排気還流通路３１が挟まれたときに、排気還流通路３１が潰れて衝撃を吸収することができる。 The exhaust gas recirculation passage 31 located between the front catalyst 20 and the rear surface of the engine 3 is a hollow pipe and is more likely to be crushed than the cooling device 32. When the exhaust gas recirculation passage 31 is sandwiched between the catalyst 20 and the rear surface 3b of the engine 3, the exhaust gas recirculation passage 31 is crushed and can absorb the impact.
　また、フロント触媒２０は車幅方向左側に位置し、冷却装置３２は車幅方向右方側に位置し、エンジン３の後面３ｂに沿って車幅方向に互いにオフセットして配置されており、冷却装置３２のガス入口３２ａは冷却装置３２において車幅方向右側に位置している。特に、本実施形態では、冷却装置３２は、フロント触媒２０に対して全ての部位が車幅方向右側に、即ち車幅方向に異なる位置に位置するように配置されている。 The front catalyst 20 is positioned on the left side in the vehicle width direction, the cooling device 32 is positioned on the right side in the vehicle width direction, and are arranged along the rear surface 3b of the engine 3 so as to be offset from each other in the vehicle width direction. A gas inlet 32a of the device 32 is located on the right side of the cooling device 32 in the vehicle width direction. In particular, in this embodiment, the cooling device 32 is arranged so that all parts thereof are located on the right side in the vehicle width direction with respect to the front catalyst 20, that is, in different positions in the vehicle width direction.
　これにより、冷却装置３２のガス入口３２ａと排気導入口２０ｃとの距離が、ガス出口３２ｂと排気導入口２０ｃとの距離より長くなるように配置されており、排気導入口２０ｃと冷却装置３２との間の排気側通路３１ａを、即ち排気通路８からの排気導入箇所と冷却装置３２との間の排気還流通路３１を長く確保することができる。したがって、排気通路８と冷却装置３２との間の排気還流通路３１において、排気還流ガスの温度を大きく低下させることができる。これにより、エンジン３の吸気温度をより低下させて排気還流装置の性能向上を図るとともに、冷却装置３２を小型化して冷却装置３２を含むエンジンユニットの車両１への搭載性を更に向上させることができる。 As a result, the distance between the gas inlet 32a of the cooling device 32 and the exhaust inlet 20c is longer than the distance between the gas outlet 32b and the exhaust inlet 20c. It is possible to secure a long exhaust side passage 31 a between them, that is, the exhaust gas recirculation passage 31 between the point where the exhaust gas is introduced from the exhaust passage 8 and the cooling device 32 . Therefore, in the exhaust gas recirculation passage 31 between the exhaust passage 8 and the cooling device 32, the temperature of the exhaust gas recirculated can be greatly reduced. As a result, the intake air temperature of the engine 3 can be further lowered to improve the performance of the exhaust gas recirculation system, and the cooling device 32 can be downsized to further improve the mountability of the engine unit including the cooling device 32 on the vehicle 1. can.
　本実施形態では、冷却装置３２は、長手方向が車幅方向になるように配置されるとともに、フロント触媒２０に対して車幅方向遠方側である車幅方向右側の端部がガス入口３２ａとなっている。
　なお、本実施形態においては、冷却装置３２のガス入口３２ａはフロント触媒２０に対する冷却装置３２のオフセット方向側に位置している。 In this embodiment, the cooling device 32 is arranged such that its longitudinal direction is the vehicle width direction, and the right end portion in the vehicle width direction, which is the far side in the vehicle width direction with respect to the front catalyst 20, serves as the gas inlet 32a. It's becoming
In this embodiment, the gas inlet 32 a of the cooling device 32 is located on the offset direction side of the cooling device 32 with respect to the front catalyst 20 .
　これにより、排気通路８と冷却装置３２との間の排気還流通路３１を長く確保するように冷却装置３２を容易にレイアウトすることができる。 As a result, the cooling device 32 can be easily laid out so as to secure a long exhaust gas recirculation passage 31 between the exhaust passage 8 and the cooling device 32 .
　更に、図２、３に示すように、フロント触媒２０は、排気入口２０ａから排気出口２０ｂに向かって車幅方向左方かつ車両後方に、即ち冷却装置３２と離間する方向に傾斜して配置されている。これにより、冷却装置３２とフロント触媒２０とを離間させ、フロント触媒２０の温度上昇に伴う排気還流ガスの温度上昇を抑制することができる。 Further, as shown in FIGS. 2 and 3, the front catalyst 20 is arranged to be inclined leftward in the vehicle width direction and rearward of the vehicle from the exhaust inlet 20a toward the exhaust outlet 20b, that is, in a direction away from the cooling device 32. ing. As a result, the cooling device 32 and the front catalyst 20 are separated from each other, and the temperature rise of the exhaust gas recirculation gas due to the temperature rise of the front catalyst 20 can be suppressed.
　また、本実施形態では、冷却装置３２を通過した冷却水排出路４１の一部が、排気マニホールド７と排気還流通路３１の間の空間を通るとともに、冷却装置３２の下流の排気還流通路３１に隣接して延びるように配置されている。これにより、冷却水排出路４１を通過する冷却水によって、排気還流通路３１を冷却して、排気還流ガスの温度を更に低下させることができる。 Further, in the present embodiment, a part of the cooling water discharge passage 41 that has passed through the cooling device 32 passes through the space between the exhaust manifold 7 and the exhaust gas recirculation passage 31, and also to the exhaust gas recirculation passage 31 downstream of the cooling device 32. They are arranged so as to extend adjacently. As a result, the cooling water passing through the cooling water discharge passage 41 can cool the exhaust gas recirculation passage 31 and further reduce the temperature of the exhaust gas recirculation gas.
　また、冷却水排出路４１が排気マニホールド７と排気還流通路３１の間の空間に配置されることで、排気マニホールド７の熱を排気還流通路３１に伝わり難くする効果も有する。 In addition, since the cooling water discharge passage 41 is arranged in the space between the exhaust manifold 7 and the exhaust gas recirculation passage 31 , it has the effect of making it difficult for the heat of the exhaust manifold 7 to be transmitted to the exhaust gas recirculation passage 31 .
　なお、本発明は上記実施形態に限定するものではない。例えば、上記実施形態では、フロント触媒２０と冷却装置３２とが車両後面視において完全に重ならないように配置されているが、一部重なっていてもよい。この場合、フロント触媒２０あるいは冷却装置３２の車両前後方向の大きさが比較的小さい箇所で重なっていることが望ましい。このように、フロント触媒２０と冷却装置３２とが車両後面視において一部が重なるように配置されていたとしても、車両前突時にてエンジン３の後方にクラッシャブルスペースを大きく確保することができるとともに、フロント触媒２０の後方への移動を抑制することができる。 The present invention is not limited to the above embodiments. For example, in the above embodiment, the front catalyst 20 and the cooling device 32 are arranged so as not to completely overlap when viewed from the rear of the vehicle, but they may partially overlap. In this case, it is desirable that the front catalyst 20 or the cooling device 32 overlap at a location where the size in the longitudinal direction of the vehicle is relatively small. In this manner, even if the front catalyst 20 and the cooling device 32 are arranged so as to partially overlap when viewed from the rear of the vehicle, a large crushable space can be secured behind the engine 3 in the event of a frontal collision of the vehicle. At the same time, rearward movement of the front catalyst 20 can be suppressed.
　また、フロント触媒２０と冷却装置３２は、エンジン３の後面３ｂに沿って車幅方向に互いにオフセットして配置されているが、例えば上下方向や上下左右斜め方向に互いにオフセットしていてもよい。また、冷却装置３２をエンジン３の後面に沿って、例えば上下方向や上下左右斜め方向に傾斜して配置してもよい。このような場合でも、冷却装置３２のうち、フロント触媒２０の下流側の排気通路８から遠い位置をガス入口３２ａとすることで、排気還流通路３１を長くして、排気還流ガスの温度低下を促すことができる。 In addition, the front catalyst 20 and the cooling device 32 are arranged offset from each other in the vehicle width direction along the rear surface 3b of the engine 3, but they may be offset from each other in the vertical direction or in the vertical, left, right, and oblique directions, for example. Further, the cooling device 32 may be arranged along the rear surface of the engine 3, for example, inclined in the vertical direction or in the vertical, horizontal, and horizontal directions. Even in such a case, by setting the gas inlet 32a in the cooling device 32 farther from the exhaust passage 8 on the downstream side of the front catalyst 20, the exhaust gas recirculation passage 31 can be lengthened and the temperature of the exhaust gas recirculated can be reduced. can be encouraged.
　また、上記実施形態では、冷却装置３２を通過した冷却水排出路４１の一部が、冷却装置３２の下流の排気還流通路３１に隣接して延びるように配置されているが、冷却装置３２に冷却水を導入する冷却水導入路４０の少なくとも一部と排気還流通路３１とが隣接して延びるように配置してもよい。 In the above-described embodiment, a portion of the cooling water discharge passage 41 that has passed through the cooling device 32 is arranged to extend adjacent to the exhaust gas recirculation passage 31 downstream of the cooling device 32. At least part of cooling water introduction passage 40 for introducing cooling water and exhaust gas recirculation passage 31 may be arranged so as to extend adjacent to each other.
　また、本実施形態では、プラグインハイブリッド車に搭載したエンジン３に本発明を適用しているが、ハイブリッド車やガソリン車に搭載されたエンジン、あるいは車両搭載以外のエンジンにも適用することができる。本発明は冷却装置を有する車両のエンジンに対して広く適用することが可能である。 Further, in this embodiment, the present invention is applied to the engine 3 mounted on a plug-in hybrid vehicle, but it can also be applied to an engine mounted on a hybrid vehicle or a gasoline vehicle, or an engine other than a vehicle. . INDUSTRIAL APPLICABILITY The present invention can be widely applied to vehicle engines having a cooling device.
　１　車両
　３　エンジン
　３ｂ　後面
　６　吸気通路
　８　排気通路
　２０　フロント触媒（排気浄化触媒）
　２０ａ　排気入口
　２０ｂ　排気出口
　２０ｃ　排気導入口
　３０　排気還流装置
　３１　排気還流通路
　３１ａ　排気側通路
　３１ｂ　吸気側通路
　３２　　冷却装置
　３２ａ　ガス入口（排気の取入口）
　３２ｂ　ガス出口 (排気の排出口)
　４１　冷却水排出路（冷却水の通路） Reference Signs List 1 vehicle 3 engine 3b rear surface 6 intake passage 8 exhaust passage 20 front catalyst (exhaust purification catalyst)
20a exhaust inlet 20b exhaust outlet 20c exhaust inlet 30 exhaust gas recirculation device 31 exhaust gas recirculation passage 31a exhaust side passage 31b intake side passage 32 cooling device 32a gas inlet (exhaust intake)
32b gas outlet (exhaust outlet)
41 cooling water discharge path (cooling water passage)

Claims (6)

  1. 　車両に搭載され、排気通路に排気浄化触媒が備えられるとともに、排気還流装置を備えたエンジンの補機配置構造であって、
    　前記排気還流装置は、前記エンジンの排気通路から排気の一部を吸気通路に還流する排気還流通路と、前記排気還流通路に介装された冷却装置と、を備え、
    　前記排気還流通路は、前記排気浄化触媒の下流側の前記排気通路に設けられた排気導入口と前記冷却装置の排気の取入口とを接続する排気側通路と、前記吸気通路と前記冷却装置の排気の排出口とを接続する吸気側通路を有し、
    　前記冷却装置は、前記排気の取入口と前記排気導入口との距離が、前記排気の排出口と前記排気導入口との距離より長くなるように配置されている
    ことを特徴とするエンジンの補機配置構造。     An auxiliary equipment arrangement structure for an engine mounted on a vehicle and provided with an exhaust purification catalyst in an exhaust passage and an exhaust gas recirculation device,
    The exhaust gas recirculation device includes an exhaust gas recirculation passage that recirculates a portion of the exhaust gas from the exhaust passage of the engine to the intake passage, and a cooling device interposed in the exhaust gas recirculation passage,
    The exhaust gas recirculation passage includes an exhaust side passage connecting an exhaust introduction port provided in the exhaust passage downstream of the exhaust purification catalyst and an exhaust intake port of the cooling device, and an exhaust side passage connecting the intake passage and the cooling device. Having an intake side passage that connects with an exhaust outlet,
    The cooling device is arranged such that the distance between the exhaust inlet and the exhaust inlet is longer than the distance between the exhaust outlet and the exhaust inlet. Machine arrangement structure.
  2. 　前記排気浄化触媒及び前記冷却装置は、車幅方向に互いにオフセットして配置され、
    　前記冷却装置は、長手方向が車幅方向になるように配置されるとともに、前記排気浄化触媒に対してオフセットしている方向側の端部が前記排気の取入口となるように配置されていることを特徴とする請求項１に記載のエンジンの補機配置構造。     The exhaust purification catalyst and the cooling device are arranged offset from each other in the vehicle width direction,
    The cooling device is arranged such that the longitudinal direction thereof is the vehicle width direction, and the end portion of the cooling device on the side in the direction offset with respect to the exhaust purification catalyst is arranged so as to serve as an intake port for the exhaust gas. 2. The accessory layout structure for an engine according to claim 1, wherein:
  3. 　前記排気浄化触媒は、排気入口から排気出口に向かって前記冷却装置と離間する方向に傾斜して配置されていることを特徴とする請求項１または２に記載のエンジンの補機配置構造。 3. The engine accessory arrangement structure according to claim 1 or 2, wherein the exhaust purification catalyst is arranged to be inclined in a direction away from the cooling device from the exhaust inlet toward the exhaust outlet.
  4. 　前記排気浄化触媒と前記冷却装置とは、前記エンジンの後面視において、車幅方向で全ての部位が互いに異なる位置に配置されていることを特徴とする請求項１から３のいずれか１項に記載のエンジンの補機配置構造。 4. The exhaust purification catalyst and the cooling device according to any one of claims 1 to 3, wherein all portions of the exhaust purification catalyst and the cooling device are arranged at positions different from each other in the vehicle width direction in a rear view of the engine. Auxiliary arrangement structure of the described engine.
  5. 　前記排気浄化触媒は、前記エンジンの後面に対して離間して配置され、
    　前記冷却装置の下流側の前記排気還流通路は、前記排気浄化触媒と前記エンジンの後面との間を通過して前記冷却装置とは反対側に延びることを特徴とする請求項１から４のいずれか１項に記載のエンジンの補機配置構造。     The exhaust purification catalyst is spaced apart from the rear surface of the engine,
    5. The exhaust gas recirculation passage on the downstream side of the cooling device passes between the exhaust purification catalyst and the rear surface of the engine and extends to the side opposite to the cooling device. 1. The engine accessory layout structure according to claim 1.
  6. 　前記冷却装置は、冷却水を導入して前記排気還流通路を通過する排気を冷却する水冷式の冷却器であり、
    　前記冷却装置へ導入される前記冷却水の通路は、前記冷却装置の上流側及び下流側の少なくとも一方で前記排気還流通路に隣接して延びるように配置されていることを特徴とする請求項１から５のいずれか１項に記載のエンジンの補機配置構造。

          The cooling device is a water-cooled cooler that introduces cooling water to cool the exhaust gas passing through the exhaust gas recirculation passage,
    2. The cooling water passage introduced into the cooling device is arranged so as to extend adjacent to the exhaust gas recirculation passage on at least one of the upstream side and the downstream side of the cooling device. 6. The accessory arrangement structure of the engine according to any one of 1 to 5.
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