JPS598658B2 - cylinder number control engine - Google Patents
cylinder number control engineInfo
- Publication number
- JPS598658B2 JPS598658B2 JP5899379A JP5899379A JPS598658B2 JP S598658 B2 JPS598658 B2 JP S598658B2 JP 5899379 A JP5899379 A JP 5899379A JP 5899379 A JP5899379 A JP 5899379A JP S598658 B2 JPS598658 B2 JP S598658B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinders
- exhaust
- partial cylinder
- cylinder
- cylinder operation
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/08—Timing or lift different for valves of different cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
【発明の詳細な説明】
本発明は、エンジン軽負荷時に一部気筒の作動を停止し
て部分気筒運転を行う自動車用気箇数制御エンジンに関
し、特にその排温低下防止に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automotive engine that performs partial cylinder operation by stopping the operation of some cylinders when the engine is under light load, and particularly relates to preventing a drop in exhaust temperature thereof.
一般に、エンジンを高い負荷状態で運転すると燃費が良
好になる傾向があり、このため自動車用多気筒エンジン
において、エンジン負荷の小さいときに、一部気筒への
燃料の供給をカットして作動を休止させて、この分だけ
残りの稼動気簡の負荷を相対的に高め、全体として軽負
荷領域の燃費を改善するようにした気筒数制御エンジン
が考えられた。In general, when an engine is operated under a high load condition, fuel efficiency tends to improve.For this reason, when the engine load is light, in an automobile multi-cylinder engine, the fuel supply to some cylinders is cut and operation is stopped. An engine with a controlled number of cylinders was devised in which the remaining operating load is relatively increased by this amount, thereby improving fuel efficiency in the light load range as a whole.
このエンジンでは、部分気筒運転時に燃費、つまシ気筒
内での燃焼状態が改善されることなどのため、全気筒運
転時に比べて相対的に排温が低下して、排気系での触媒
による排気の浄化作用が悪化するといった問題がある。With this engine, fuel efficiency and combustion conditions within the cylinders are improved during partial cylinder operation, so the exhaust temperature is relatively lower compared to when operating on all cylinders, and the exhaust gas is reduced by the catalyst in the exhaust system. There is a problem that the purification effect of
本発明は、上記に鑑みなされたもので、部分気筒運転時
にも排温が適度に維持されるようにして、部分気筒運転
時の排気の浄化を改善した自動車用気筒数制御エンジン
を得ることを目的とする。The present invention has been made in view of the above, and aims to provide an engine with controlled number of cylinders for an automobile, which maintains an appropriate exhaust temperature even during partial cylinder operation, and improves purification of exhaust gas during partial cylinder operation. purpose.
以下図面によって説明する。This will be explained below with reference to the drawings.
図面は本発明の実施例を示すもので、１は吸気通路、２
は絞り弁である。The drawings show an embodiment of the present invention, in which 1 indicates an intake passage, 2
is a throttle valve.
吸気通路１は途中から稼動吸気通路１ａと休止吸気通路
１ｂとに分岐しておシ、稼動吸気通路１ａは気筒≠４〜
≠６に、休止吸気通路１ｂは気筒＋１〜≠３にそれぞれ
接続している。The intake passage 1 branches into an active intake passage 1a and a rest intake passage 1b from the middle, and the active intake passage 1a has cylinders ≠ 4 to 4.
≠6, the idle intake passage 1b is connected to cylinders +1 to ≠3, respectively.
気筒４Ｆ１〜＋３は、部分気筒運転時に燃料の供給が停
止され作動が休止する気筒であり、また気筒４ｌ−４〜
≠６は常時稼動する気筒である。Cylinders 4F1 to +3 are cylinders whose operation is suspended due to fuel supply being stopped during partial cylinder operation, and cylinders 4F1 to 4F1 are cylinders whose operation is suspended during partial cylinder operation.
≠6 is a cylinder that is always in operation.
休止吸気通路１ｂの上流部には、遮断弁３が介装されて
おシ、部分気筒運転時にこの遮断弁３が閉じて気筒４ｌ
＝１〜＝＃＝３への新気の供給を遮断する。A cutoff valve 3 is interposed in the upstream part of the idle intake passage 1b, and when the cutoff valve 3 is closed during partial cylinder operation, the cylinder 4l is closed.
Cut off the supply of fresh air to =1 to =#=3.
遮断弁３は、ダイヤ７ラム装置４によって駆動され、部
分気筒運転時には三方電磁弁５からダイヤフラム装置４
に稼動吸気通路１ａの負圧が導入されて閉弁し、逆に全
気筒運転時にはダイヤフラム装置４に大気圧が導入され
て開弁ずる。The shutoff valve 3 is driven by a 7-diameter ram device 4, and during partial cylinder operation, the shutoff valve 3 is driven by a diaphragm device 4 from a three-way solenoid valve 5.
At this time, negative pressure in the working intake passage 1a is introduced and the valve is closed, and conversely, when all cylinders are operated, atmospheric pressure is introduced into the diaphragm device 4 and the valve is opened.
一方、排気通路６は、気筒″ＩＩ−４〜≠６に接続した
稼動排気通路６ａと、気筒＋１〜≠３に接続した休止排
気通路６ｂとに途中まで分岐している。On the other hand, the exhaust passage 6 branches halfway into an active exhaust passage 6a connected to the cylinders II-4 to ≠6 and a rest exhaust passage 6b connected to the cylinders +1 to ≠3.
この休止排気通路６ｂと遮断弁下流の休止吸気通路１ｂ
とは排気還流通路７によって結ばれてお勺、該通路７に
介装された排気還流弁８が部分気筒運転時に開いて、前
記通路７を介して略大気圧の排気を気筒１〜＋３に還流
して、作動休止中の気筒ｉ〜＋−３におけるポンピング
ロスヲ低減し一層の燃費の改善を図る。This idle exhaust passage 6b and the idle intake passage 1b downstream of the shutoff valve.
The exhaust gas recirculation valve 8, which is connected to the exhaust gas recirculation passage 7, opens during partial cylinder operation to send exhaust gas at approximately atmospheric pressure to the cylinders 1 to +3 through the passage 7. The pumping loss in the cylinders i to +-3 which are not in operation is reduced by refluxing, thereby further improving fuel efficiency.
排気還流弁８ぱ、ダイヤフラム装置９によって？動され
、部分気筒運転時には三方電磁弁１０からダイヤフラム
装置９に稼動吸気通路１ａの負圧が導入されて開弁し、
逆に全気筒運転時にはダイヤフラム装置９に大気圧が導
入されて閉弁する。By the exhaust recirculation valve 8 and the diaphragm device 9? During partial cylinder operation, the negative pressure of the active intake passage 1a is introduced from the three-way solenoid valve 10 to the diaphragm device 9, and the valve opens.
Conversely, during full cylinder operation, atmospheric pressure is introduced into the diaphragm device 9 and the valve is closed.
ここで、部分気筒運転時に作動が休止する側の気筒とし
て、冷却用のファンからの風や走行風に対して風上側に
位置する気筒＋１〜≠３を用い、また常時稼動する側の
気筒として、逆に風下側に位置する気筒≠４〜ナ６を用
いて、後述するように、部分気筒運転時に排温を保持す
るのである。Here, cylinders +1 to ≠3 located on the windward side with respect to the wind from the cooling fan and the running wind are used as cylinders whose operation is suspended during partial cylinder operation, and cylinders which are constantly in operation are used. On the other hand, cylinders ≠ 4 to 6 located on the leeward side are used to maintain the exhaust temperature during partial cylinder operation, as will be described later.
稼動排気通路６ａと休止排気通路６ｂとの合流点下流の
排気通路６ｃには、０センサ１１が設置されており、こ
れにより間接的に空燃比を検出して、空燃比が理論空燃
比となるようにフィードバック制御を行う。An 0 sensor 11 is installed in the exhaust passage 6c downstream of the confluence of the active exhaust passage 6a and the idle exhaust passage 6b, which indirectly detects the air-fuel ratio so that the air-fuel ratio becomes the stoichiometric air-fuel ratio. Feedback control is performed as follows.
さらに、０センサ１１の下流の排気通路６ｃには三元触
媒１２が配設されている。Further, a three-way catalyst 12 is disposed in the exhaust passage 6c downstream of the zero sensor 11.
この三元触媒１２は排気中の未燃ＨＣ ，ＣＯを酸化す
ると同時にＮＯｘを還元して排気を浄化するもので、そ
の際の酸化および還元効率は排温が所定値以上のときに
良好となるので、相対的に排温が低下する部分気筒運転
時に特に排温の保持を図る必要性が起こるのである。This three-way catalyst 12 purifies the exhaust gas by oxidizing unburned HC and CO in the exhaust gas and reducing NOx at the same time, and the oxidation and reduction efficiency is good when the exhaust temperature is above a predetermined value. Therefore, there is a need to maintain the exhaust temperature especially during partial cylinder operation where the exhaust temperature is relatively low.
今、部分気筒運転が行われているとする。Assume that partial cylinder operation is currently being performed.
作動中である気筒ナ４〜≠６の燃焼性が相対的に改善さ
れること、および作動休止中の気筒ナ１〜＋３の吸気系
に還流すべき気筒４Ｉ−１〜≠３から排出された低温の
排気が合流点下流の排気通路６に流出して気筒１〜＋６
からの高温の排気に混入すること、によってこの部分気
筒運転時には相対的に排気の温度が低下する。The combustibility of cylinders No. 4 to ≠ 6 which are in operation is relatively improved, and the exhaust from cylinders 4I-1 to ≠ 3 which should be recirculated to the intake systems of cylinders No. 1 to +3 which are not in operation. Low-temperature exhaust flows into the exhaust passage 6 downstream of the confluence point and flows into cylinders 1 to +6.
During this partial cylinder operation, the temperature of the exhaust gas is relatively lowered by mixing with the high temperature exhaust gas from the engine.
しかしながら本発明では、作動中の気筒とじて冷却用の
ファンからの風や走行風に対して風下側の気筒４ｌ＝４
〜＋６を用いたので、気筒−Ｈ″４〜＋６側のエンジン
本体や稼動排気通路６ａに当たる冷却用の走行風やファ
ンからの風を風上側の気筒−＋１〜＋３側のエンジン本
体や休止排気通路６ｂがさえぎることになり、この結果
気筒４ｌ８４〜＋６の燃焼室や稼動排気通路６ａにおけ
る放熱量が大幅に低減している。However, in the present invention, the cylinder 4l on the leeward side with respect to the wind from the cooling fan and the running wind when the cylinder is in operation is 4l=4.
~ +6 was used, so the running wind for cooling and the wind from the fan that hits the engine body on the side of cylinders -H''4 to +6 and the working exhaust passage 6a are transferred to the engine body and the idle exhaust on the side of cylinders -+1 to +3 on the windward side. The passage 6b is obstructed, and as a result, the amount of heat dissipated in the combustion chambers of the cylinders 4l84 to +6 and the working exhaust passage 6a is significantly reduced.
このため、部分気筒運転時に、主に作動中の気筒＋−４
〜≠６から排出された三元触媒１２に流入する排気の温
度を上記の放熱量の低減分だけ高めることができ、よっ
て部分気筒運転時においてもその排気の温度を所定値以
上に保持することが可能となる。For this reason, during partial cylinder operation, mainly the operating cylinder +-4
The temperature of the exhaust gas discharged from ~≠6 and flowing into the three-way catalyst 12 can be increased by the amount of the reduction in the amount of heat released, and therefore the temperature of the exhaust gas can be maintained at a predetermined value or higher even during partial cylinder operation. becomes possible.
したがって部分気筒運転時においても三元触媒１２の浄
化作用を良好に維持することができる。Therefore, the purifying action of the three-way catalyst 12 can be maintained well even during partial cylinder operation.
以上説明したように、本発明は、部分気筒運転時におい
ても稼動する気筒として、冷却用のファンからの風や走
行風に対して風下側の気筒を用いて、これら気筒に当た
る上記の風を部分気筒運転時に作動が休止する気筒でさ
えぎるようにして、部分気筒運転時に作動中の気筒側の
エンジン本体や排気系での放熱量を低減させるので、特
に部分気筒運転時においても、排気管に特別の保温構造
を採用しなくても触媒に流入する排気の温度を所定値以
上に保持でき、よって触媒による排気の浄化作用を常に
良好に保つことができる。As explained above, the present invention uses the cylinders on the lee side against the wind from the cooling fan and the running wind as the cylinders that operate even during partial cylinder operation, and partially reduces the wind hitting these cylinders. By blocking the cylinders that are inactive during cylinder operation, the amount of heat dissipated from the engine body and exhaust system on the active cylinder side during partial cylinder operation is reduced, so even during partial cylinder operation, special The temperature of the exhaust gas flowing into the catalyst can be maintained at a predetermined value or higher even without employing the heat retention structure, and therefore the exhaust gas purification effect of the catalyst can be maintained at a good level at all times.
図面は本発明の実施例を示す概略断面図である。
１２・・・三元触媒、−４Ｆ１．４Ｐ２ ，＋３ ，≠
４，＋５，＋６・・・気筒。The drawings are schematic sectional views showing embodiments of the present invention. 12...Three-way catalyst, -4F1.4P2, +3,≠
4, +5, +6... cylinder.
Claims (1)
気筒運転を行う手段と、排気系に触媒とを備えた自動車
用多気筒エンジンにおいて、部分気筒運転時に作動の停
止する気筒として冷却用のファンからの風や走行風に対
して風上側に位置した半数の気筒を用い、また常時作動
する気筒として残シの風下側に位置した半数の気筒を用
いるようにした気箇数制御エンジン。1. In a multi-cylinder automobile engine equipped with a means for performing partial cylinder operation by stopping the operation of some cylinders during light engine load and a catalyst in the exhaust system, a cooling cylinder is used as the cylinder whose operation is stopped during partial cylinder operation. This air cylinder number control engine uses half of the cylinders located on the windward side with respect to the wind from the fan and the running wind, and uses the remaining half of the cylinders located on the leeward side as constantly operating cylinders.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5899379A JPS598658B2 (en) | 1979-05-14 | 1979-05-14 | cylinder number control engine |
| DE19803017697 DE3017697A1 (en) | 1979-05-14 | 1980-05-08 | IC engine with grouped cylinders - has constantly operating group downstream of part load group in cooling air flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5899379A JPS598658B2 (en) | 1979-05-14 | 1979-05-14 | cylinder number control engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55151130A JPS55151130A (en) | 1980-11-25 |
| JPS598658B2 true JPS598658B2 (en) | 1984-02-25 |
Family
ID=13100362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5899379A Expired JPS598658B2 (en) | 1979-05-14 | 1979-05-14 | cylinder number control engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS598658B2 (en) |
| DE (1) | DE3017697A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0633806A (en) * | 1992-07-16 | 1994-02-08 | Mitsubishi Motors Corp | On-vehicle structure of engine with inoperative cylinder mechanism |
-
1979
- 1979-05-14 JP JP5899379A patent/JPS598658B2/en not_active Expired
-
1980
- 1980-05-08 DE DE19803017697 patent/DE3017697A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE3017697A1 (en) | 1980-11-20 |
| JPS55151130A (en) | 1980-11-25 |
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