JPS60138222A - Exhaust mechanism for direct-injection type diesel engine - Google Patents
Exhaust mechanism for direct-injection type diesel engineInfo
- Publication number
- JPS60138222A JPS60138222A JP24852983A JP24852983A JPS60138222A JP S60138222 A JPS60138222 A JP S60138222A JP 24852983 A JP24852983 A JP 24852983A JP 24852983 A JP24852983 A JP 24852983A JP S60138222 A JPS60138222 A JP S60138222A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- valve
- exhaust passage
- feeler
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/14—Direct injection into combustion chamber
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
【発明の詳細な説明】
く本発明の技術分野〉
本発明は、直噴型ディーゼルエンジンの排気装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an exhaust system for a direct injection diesel engine.
〈従来技術とその欠点〉
従来、直噴型ディーゼルエンジンでは、冷始動後、燃焼
室内の燃焼後の熱い空気がそっくり冷たい外気と入れか
えられるので、比較的長時間にわたり暖機運転を行なわ
ねばならないうえ、エンジンが十分に暖まらないうちは
燃焼室での燃焼か十分に進行せず、白煙が吐外出される
欠点がある。<Prior art and its drawbacks> Conventionally, in a direct injection diesel engine, after a cold start, the hot air after combustion in the combustion chamber is completely replaced with cold outside air, so it is necessary to warm up the engine for a relatively long time. However, until the engine is sufficiently warmed up, combustion in the combustion chamber will not proceed sufficiently and white smoke will be emitted.
〈本発明の目的〉
本発明は、上述の事情に鑑み、冷始動時の白煙の発生を
少なくし、また、暖機運転時間を短縮することを目的と
する。<Objective of the present invention> In view of the above-mentioned circumstances, the present invention aims to reduce the generation of white smoke during cold start and shorten the warm-up operation time.
く本発明の構成〉
本発明は、上述の目的を達成するために、エンジンの機
体温度に対応して伸縮する感温伸縮手段を設け、排気路
にその流路断面積を調節する調節弁を介在させ、この調
節弁を」−記感温伸縮手段に機体温度が低いときには開
度か小さく、機体温度か高いととには開度が大トくなる
ように連動させたことを特徴とする。Structure of the Present Invention In order to achieve the above-mentioned object, the present invention provides a temperature-sensitive expansion and contraction means that expands and contracts in accordance with the body temperature of the engine, and a control valve that adjusts the cross-sectional area of the flow path in the exhaust path. The control valve is interposed with the temperature-sensitive expansion and contraction means so that the opening degree is small when the body temperature is low, and the opening degree is increased when the body temperature is high. .
このように構成すれば、冷始動直後のエンジンの機体温
度が低い間は排気路の流路断面か小さく絞られ、燃焼後
の熱い排気がシリングから出にくくなって、機体温度が
早く上昇させられ、白煙の発生が少なくなる。With this configuration, while the engine body temperature is low immediately after a cold start, the cross section of the exhaust passage is narrowed to a small size, making it difficult for hot exhaust gas to come out from the sill after combustion, and causing the body temperature to rise quickly. , the generation of white smoke will be reduced.
〈実施例の説明〉 以下、本発明の実施例を図面に基づき説明する。<Explanation of Examples> Embodiments of the present invention will be described below based on the drawings.
第１図は農業用トラクタに用いる水冷直列３気筒直噴型
デイーゼルエンジンの側面図であり、このエンジン１の
シリンダへラド２の一側に排気マニフオールド３が連結
され、さらにマフラ４が連結される。FIG. 1 is a side view of a water-cooled in-line three-cylinder direct injection diesel engine used in an agricultural tractor. An exhaust manifold 3 is connected to one side of a cylinder rad 2 of the engine 1, and a muffler 4 is further connected to the cylinder. Ru.
第２図に示すように、排気マニフォールド３の集合管部
５にはその内部に形成された排気路６の流路断面積を調
節する調節弁７が設けられる。すなわち、集合管部５内
の排気路６の一部分を太鼓状に拡径させて弁室８を形成
し、その弁室８の入口９（または出口１０）に向って進
退させらる茸形弁１１を該弁室８に挿入する。この茸形
弁１１の径は上記弁室８の入口９（または出口１０）を
完全に閉じないように、その人口９（または出口１０）
よりも僅かに小径に形成しである。これにより、閉弁状
態においても、第２図に示すように始動のために最少限
必要とする排気路６の流路面積は開かれる。また、最大
開弁時の弁室８の最小流路断面積は排気マニアオールド
３の各人口１７の開口面積よりも大きくして、暖気運転
終了後に排気圧が無用に高められないようにしである。As shown in FIG. 2, the collecting pipe portion 5 of the exhaust manifold 3 is provided with a control valve 7 for adjusting the cross-sectional area of the exhaust passage 6 formed therein. That is, the valve chamber 8 is formed by expanding a portion of the exhaust passage 6 in the collecting pipe section 5 into a drum shape, and the mushroom-shaped valve is moved forward and backward toward the inlet 9 (or outlet 10) of the valve chamber 8. 11 into the valve chamber 8. The diameter of this mushroom-shaped valve 11 is set so that the inlet 9 (or outlet 10) of the valve chamber 8 is not completely closed.
It is formed to have a slightly smaller diameter than that of the conventional one. As a result, even in the valve closed state, the minimum flow area of the exhaust passage 6 required for starting is opened, as shown in FIG. In addition, the minimum flow passage cross-sectional area of the valve chamber 8 when the valve is opened to the maximum is made larger than the opening area of each port 17 of the exhaust mania old 3 to prevent the exhaust pressure from increasing unnecessarily after the warm-up operation is completed. .
この茸形弁１１は、エンジン１の機体温度に同心して伸
縮する感温伸縮手段１２により開弁駆動され、閉弁バネ
］３により閉弁付勢される。上記感温伸縮手段１２は、
第３図に示すように、機体温度を検知し、その温度に対
応する電気信号を出力するサーミスタ等の感温素子１４
と、その出力に基づいて駆動されるソレノイドよりなる
アクチュエータ１５と、アクチュエータ１５の駆動電流
を感温素子１４の出力信号値に対応して制御する制御回
路１６とからなる。この制御回路１６は機体温度が低い
とぎにはアクチュエータ１５の作動量が小さく、機体温
度か高いとぎにはその作動量か大ぎくなるように駆動電
流をアクチュエータ１５に出力する。The mushroom-shaped valve 11 is driven to open by a temperature-sensitive expansion/contraction means 12 that expands and contracts concentrically with the body temperature of the engine 1, and is biased to close by a valve-closing spring 3. The temperature-sensitive expansion and contraction means 12 is
As shown in FIG. 3, a temperature sensing element 14 such as a thermistor that detects the temperature of the aircraft and outputs an electrical signal corresponding to the temperature.
, an actuator 15 made of a solenoid that is driven based on the output thereof, and a control circuit 16 that controls the drive current of the actuator 15 in accordance with the output signal value of the temperature sensing element 14. This control circuit 16 outputs a drive current to the actuator 15 so that the actuation amount of the actuator 15 is small when the body temperature is low, and becomes large when the body temperature is high.
」１記感温素子１４の設置箇所はエンジン１の機体温度
、特にシリンダないしシリンダヘッド部分の温度を直接
または間接に検知し得る箇所であればどこでもよい。す
なわち、エンジン１の本体に限３−
らす、排気路の排気温度を介して機体温度を検出するた
めに感温素子１４を排気マニフォールド３や排気路６の
中に設けたり、エンジン冷却媒体（冷却水、冷却風）の
温度を介して機体温度を検出するためにたとえば図示し
ない冷却水路中に感温素子を配置したりすることも含ま
れる。1. The temperature sensing element 14 may be installed anywhere as long as it can directly or indirectly detect the body temperature of the engine 1, particularly the temperature of the cylinder or cylinder head portion. That is, a temperature sensing element 14 may be provided in the exhaust manifold 3 or the exhaust passage 6 to detect the airframe temperature through the exhaust temperature of the exhaust passage limited to the main body of the engine 1, or the temperature sensing element 14 may be provided in the exhaust manifold 3 or the exhaust passage 6, or the temperature sensing element 14 may be provided in the exhaust manifold 3 or the exhaust passage 6. This also includes, for example, arranging a temperature sensing element in a cooling waterway (not shown) in order to detect the temperature of the aircraft body via the temperature of cooling water or cooling air.
このように構成された排気装置によれば、冷始動直後の
エンジン１の機体温度が低い間は排気路６の流路断面が
茸形弁１１によって小さく絞られ、燃焼後の熱い排気が
シリンダから出に＜゛＜なって、冷始動後、燃焼室内の
燃焼後の熱い空気の一部が冷たい外気と入れかえられず
にシリンダ内に残り、機体温度が早く上昇させられる。According to the exhaust system configured in this way, while the body temperature of the engine 1 is low immediately after a cold start, the cross section of the exhaust passage 6 is narrowed to a small size by the mushroom-shaped valve 11, and the hot exhaust gas after combustion is prevented from leaving the cylinder. After a cold start, some of the hot air after combustion in the combustion chamber remains in the cylinder without being replaced with cold outside air, causing the aircraft temperature to rise quickly.
その結果、暖機運転時間を比較的短かくでき為うえ、エ
ンジンが十分に暖まらないうちでもシリンダに残った燃
焼済ガスの熱でシリンダ内の平均ガス温度が高められる
ので燃焼が十分シリンダ中に拡がって進行し易く、白煙
の発生が少なくなる。As a result, the warm-up time can be relatively shortened, and even before the engine is sufficiently warmed up, the average gas temperature in the cylinder is raised by the heat of the burned gas remaining in the cylinder, so that combustion is sufficiently carried out in the cylinder. It spreads and progresses easily and produces less white smoke.
ももろん、本発明は上述の実施例に限定されるものでは
なく、たとえば、感温伸縮手段はパイメ＝４−
タル、形状記憶合金など温度に対応して可逆的に変形す
る金属で構成してもよい。Of course, the present invention is not limited to the above-described embodiments; for example, the temperature-sensitive expansion/contraction means may be made of a metal that reversibly deforms in response to temperature, such as pimetal or shape memory alloy. You can.
〈本発明の効果〉
本発明は、上述のように、エンジンの機体温度に対応し
て伸縮する感温伸縮手段を設け、排気路にそのの流路断
面積を調節する調節弁を介在させ、この調節弁を機体温
度が低いと外には開度が小さく、機体温度が高いとぎに
は開度か大ぎくなるように上記感温伸縮手段に連動させ
るので、冷始動直後のエンジンの機体温度が低い間は排
気路の流路断面が小さく絞られ、熱い燃焼後の排気がシ
リンダから出にくくなり、シリンダ内の平均ガス温度が
高められ、シリンダ内で燃焼が十分に拡がり白煙の発生
が少なくなる。また、＠磯運転時間を短縮で終る。<Effects of the Invention> As described above, the present invention provides a temperature-sensitive expansion and contraction means that expands and contracts in accordance with the body temperature of the engine, and a control valve that adjusts the cross-sectional area of the flow path in the exhaust passage. This control valve is linked to the temperature-sensitive expansion and contraction means so that when the aircraft temperature is low, the opening is small, and when the aircraft temperature is high, the opening is large. While the temperature is low, the cross section of the exhaust passage is narrowed, making it difficult for hot combustion exhaust to exit the cylinder, increasing the average gas temperature in the cylinder, and allowing combustion to spread sufficiently within the cylinder to prevent the generation of white smoke. It becomes less. Also, @Iso driving time will be shortened.
図面は本発明の一実施例を示し、第１図は農業用トラク
タに用いる水冷直列３気筒直噴型デイーゼルエンジンの
側面図、第２図は第１図の■−■線に沿う縦断正面図、
第３図はその感温伸縮手段のブロック回路図である。
１・・・エンジン、６・・・排気路、７・・・調節弁、
１２・・・感温伸縮手段。
特許出願人 久保田鉄工株式会社
７−
第［株］図
第３図
Ｚ
第２図The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a water-cooled in-line three-cylinder direct injection diesel engine used for an agricultural tractor, and FIG. 2 is a longitudinal sectional front view taken along the line ■-■ in FIG. 1. ,
FIG. 3 is a block circuit diagram of the temperature-sensitive expansion and contraction means. 1... Engine, 6... Exhaust path, 7... Control valve,
12...Temperature-sensitive expansion and contraction means. Patent applicant: Kubota Iron Works Co., Ltd. 7- Figure 3Z Figure 2
Claims (1)
縮手段１２を設け、排気路６にその流路断面積を調筋す
る調節弁７を介在させ、この調節弁７を上記感温伸縮手
段１２に機体温度が低いときには開度が小さく、機体温
度が高いときには開度が大きくなるように連動させたこ
とを特徴とする、直噴型ディーゼルエンジンの排気装置1. A temperature-sensitive expansion and contraction means 12 that expands and contracts in response to the body temperature of the engine 1 is provided, a control valve 7 that adjusts the cross-sectional area of the flow path is interposed in the exhaust passage 6, and this control valve 7 is configured to expand and contract according to the temperature-sensing temperature of the engine 1. An exhaust system for a direct injection diesel engine, characterized in that means 12 is linked so that the opening degree is small when the body temperature is low and the opening degree is large when the body temperature is high.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24852983A JPS60138222A (en) | 1983-12-27 | 1983-12-27 | Exhaust mechanism for direct-injection type diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24852983A JPS60138222A (en) | 1983-12-27 | 1983-12-27 | Exhaust mechanism for direct-injection type diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60138222A true JPS60138222A (en) | 1985-07-22 |
Family
ID=17179539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24852983A Pending JPS60138222A (en) | 1983-12-27 | 1983-12-27 | Exhaust mechanism for direct-injection type diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60138222A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5657730A (en) * | 1991-04-12 | 1997-08-19 | Ab Volvo | Method for cold starting piston-type combustion engines and a device for carrying out the method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS522552U (en) * | 1975-06-24 | 1977-01-10 | ||
| JPS53109328A (en) * | 1976-12-30 | 1978-09-25 | Cummins Engine Co Inc | Exhaust brake |
-
1983
- 1983-12-27 JP JP24852983A patent/JPS60138222A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS522552U (en) * | 1975-06-24 | 1977-01-10 | ||
| JPS53109328A (en) * | 1976-12-30 | 1978-09-25 | Cummins Engine Co Inc | Exhaust brake |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5657730A (en) * | 1991-04-12 | 1997-08-19 | Ab Volvo | Method for cold starting piston-type combustion engines and a device for carrying out the method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH01253524A (en) | Cooling device for engine | |
| US8091344B2 (en) | System for modifying exhaust gas flow through an aftertreatment device | |
| JP3185581B2 (en) | Internal combustion engine cooling system | |
| JPH0633755B2 (en) | Warm-up device | |
| JPS60138222A (en) | Exhaust mechanism for direct-injection type diesel engine | |
| JP2002030930A (en) | Internal combustion engine having combustion heater | |
| JPH0849606A (en) | Exhaust gas refluxing device | |
| JPH0526121A (en) | Engine having valve timing variable mechanism | |
| JP2002097952A (en) | Exhaust manifold device for vehicle | |
| JP3712948B2 (en) | Method of operating an internal combustion engine having a heated fuel injection valve | |
| JPH0632118U (en) | Vehicle heater device | |
| JPH0720332Y2 (en) | Cylinder block structure of internal combustion engine | |
| JPH1182020A (en) | Structure of bottom bypass type thermostat valve in internal combustion engine | |
| JPS6319690B2 (en) | ||
| JPH0541213Y2 (en) | ||
| JPH0645662Y2 (en) | Engine intake air amount control device | |
| JPH0223791Y2 (en) | ||
| KR100993370B1 (en) | Exhaust gas supplied device of vehicle | |
| JPS62143056U (en) | ||
| JP2004232501A (en) | Cooling system of compression self-ignition type internal combustion engine | |
| JP2000320408A (en) | Intake heating system | |
| JPH0519532Y2 (en) | ||
| JPH0540256Y2 (en) | ||
| JPS63215865A (en) | Starter supplementation device for multicylinder diesel engine | |
| JPH0118259B2 (en) |