JPH0437237Y2 - - Google Patents
Info
- Publication number
- JPH0437237Y2 JPH0437237Y2 JP1985146914U JP14691485U JPH0437237Y2 JP H0437237 Y2 JPH0437237 Y2 JP H0437237Y2 JP 1985146914 U JP1985146914 U JP 1985146914U JP 14691485 U JP14691485 U JP 14691485U JP H0437237 Y2 JPH0437237 Y2 JP H0437237Y2
- Authority
- JP
- Japan
- Prior art keywords
- throttle valve
- intake throttle
- catalyst
- intake
- exhaust gas
- 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
Landscapes
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Exhaust Gas After Treatment (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
この考案はアルコールエンジンの吸気装置に関
する。[Detailed description of the invention] (Field of industrial application) This invention relates to an intake system for an alcohol engine.
（従来の技術）
最近、デイーゼルエンジンにおいても、石油資
源の問題から燃料の一部又は全部にアルコールを
使用することが知られている（実開昭58−33759
号公報参照）。(Prior Art) Recently, it has been known that alcohol is used as part or all of the fuel in diesel engines due to oil resource problems (Utility Model No. 58-33759).
(see publication).
（考案が解決しようとする問題点）
デイーゼルエンジンにあつては、エンジン回転
数が同一であれば、負荷状態に殆んど関係なく、
吸入空気量はほぼ一定のため、燃料供給量の少な
い低負荷運転域では空気過剰率が高くなつて、排
気温度が低下するという傾向がある。(Problem that the invention attempts to solve) In the case of a diesel engine, as long as the engine speed is the same, it is almost independent of the load condition.
Since the amount of intake air is approximately constant, in a low-load operating range where the amount of fuel supplied is small, the excess air ratio tends to increase and the exhaust temperature decreases.
このようなデイーゼルエンジンにアルコール燃
料を使用した場合、つまりアルコールエンジンに
あつてはアルデヒドの排出濃度が高く、その浄化
のために排気通路に触媒が介装されるが、アルデ
ヒドの反応飽和温度はCOと同じく約300℃で、排
気温度の低下する低負荷域では浄化率が下がつ
て、臭いなどの発生量が増大するという問題点が
ある。 When alcohol fuel is used in such a diesel engine, the concentration of aldehyde emissions is high, and a catalyst is installed in the exhaust passage to purify it, but the aldehyde reaction saturation temperature is CO Similarly, in the low load range where the exhaust gas temperature decreases at about 300℃, the purification rate decreases and the amount of odors etc. generated increases.
（問題点を解決するための手段）
そこで、この考案は第１図のように、燃料の一
部又は全部にアルコールを使用するとともに排気
通路に触媒を設けたデイーゼルエンジンにおい
て、吸気通路に介装した吸気絞弁と、吸気絞弁を
開閉する駆動手段と、排気中の酸素濃度を前記触
媒よりも上流側にて検出する手段と、排気温度を
前記触媒よりも上流側にて検出する手段と、排気
温度が設定値以下の時にのみ排気中の酸素濃度か
ら空気過剰率を演算する手段と、この空気過剰率
が所定値になるように吸気絞弁の開度を連続的に
制御する手段を設ける。(Means for solving the problem) Therefore, as shown in Fig. 1, this idea was developed to install a catalyst in the intake passage in a diesel engine that uses alcohol as part or all of the fuel and has a catalyst in the exhaust passage. a drive means for opening and closing the intake throttle valve; a means for detecting the oxygen concentration in the exhaust gas upstream of the catalyst; and a means for detecting the exhaust temperature upstream of the catalyst. , means for calculating the excess air ratio from the oxygen concentration in the exhaust only when the exhaust temperature is below a set value, and means for continuously controlling the opening degree of the intake throttle valve so that the excess air ratio becomes a predetermined value. establish.
（作用）
例えば、低負荷運転域で排気温度が設定値以下
に低下すると、空気過剰率を所定値に抑えるよう
に吸気絞弁の開度が縮小され、この絞り作動によ
り吸入空気量が減少して排気温度が上がるため、
触媒の活性化が促進される。(Function) For example, when the exhaust temperature drops below the set value in a low-load operating range, the opening of the intake throttle valve is reduced to keep the excess air ratio to a predetermined value, and this throttle action reduces the amount of intake air. As the exhaust temperature increases,
Activation of the catalyst is promoted.
（実施例）
第２図において、デイーゼルエンジン１の吸気
通路２には吸気絞弁３が介装され、吸気絞弁３は
駆動手段としてのソレノイド４に連係される。(Embodiment) In FIG. 2, an intake throttle valve 3 is interposed in an intake passage 2 of a diesel engine 1, and the intake throttle valve 3 is linked to a solenoid 4 as a driving means.
排気通路５にはマフラ６上流に触媒７が設けら
れ、触媒７の入口付近の排気温度を検出する温度
センサ８と排気中の酸素濃度を検出する酸素濃度
センサ９が設けられる。 A catalyst 7 is provided in the exhaust passage 5 upstream of a muffler 6, and a temperature sensor 8 for detecting the exhaust gas temperature near the inlet of the catalyst 7 and an oxygen concentration sensor 9 for detecting the oxygen concentration in the exhaust gas are provided.
１０は温度センサ８と酸素濃度センサ９の出力
に基づいて、吸気絞弁３の開度を制御する制御回
路で、制御回路１０は第３図のフローチヤートで
示すように、排気温度が設定値、例えば400℃以
下の吸気絞弁制御区域（第４図参照）で、酸素濃
度から空気過剰率を演算し、この空気過剰率が所
定値、例えば1.4〜1.5（それ以下になると、燃焼
状態が悪化して出力の低下及びスモークの増大を
きたす）以上のときにはこれに応じて吸気絞弁３
を閉方向に、また1.4〜1.5以下のときには同じく
開方向に作動させるようにソレノイド４の制御電
圧を制御する。なお、第５図は吸気絞弁開度−制
御電圧特性図である。 Reference numeral 10 denotes a control circuit that controls the opening degree of the intake throttle valve 3 based on the outputs of the temperature sensor 8 and the oxygen concentration sensor 9. As shown in the flowchart of FIG. For example, in the intake throttle valve control area below 400°C (see Figure 4), the excess air ratio is calculated from the oxygen concentration, and if this excess air ratio falls below a predetermined value, for example 1.4 to 1.5 (lower than that), the combustion state will deteriorate. If the above condition worsens, resulting in a decrease in output and an increase in smoke, the intake throttle valve 3
The control voltage of the solenoid 4 is controlled so that it operates in the closing direction, and when it is 1.4 to 1.5 or less, it also operates in the opening direction. Note that FIG. 5 is an intake throttle valve opening-control voltage characteristic diagram.
従つて、例えば低負荷運転域では燃料供給量が
少なくなり、相対的に空気過剰率が高くなるが、
排気温度が設定値400℃以下になると、空気過剰
率を所定値1.4〜1.5に抑えるように吸気絞弁３の
開度が縮小され、吸入空気量の減少により排気温
度が上昇するため、触媒７の活性化が促進され
る。 Therefore, for example, in a low-load operating range, the amount of fuel supplied is small and the excess air ratio is relatively high.
When the exhaust temperature falls below the set value of 400°C, the opening degree of the intake throttle valve 3 is reduced to suppress the excess air ratio to a predetermined value of 1.4 to 1.5, and the exhaust temperature increases due to the decrease in the amount of intake air, so the catalyst 7 activation is promoted.
（考案の効果）
以上要するにこの考案によれば、例えば低負荷
運転時に吸気絞弁の絞り作動により吸入空気量を
減少させ、排気温度を高めるようにしたので、触
媒の活性化が促進され、臭いなどの発生量が低減
する。(Effects of the invention) In summary, according to this invention, for example, during low-load operation, the intake air amount is reduced by throttling the intake throttle valve and the exhaust temperature is increased, which promotes activation of the catalyst and causes odor. etc. will be reduced.
また、吸気絞弁の開度を排気中の酸素濃度から
求めた空気過剰率に基づいて制御するようにした
ので、吸気絞弁の絞り作動によつて燃焼状態が悪
化し、出力の低下及びスモークの増大を招くこと
もない。 In addition, since the opening degree of the intake throttle valve is controlled based on the excess air ratio determined from the oxygen concentration in the exhaust gas, the throttle operation of the intake throttle valve worsens the combustion condition, resulting in a decrease in output and smoke. It does not cause an increase in
第１図はこの考案のクレーム対応図、第２図は
この考案の実施例を示す概略構成図、第３図は同
じく制御動作の一例を示すフローチヤート、第４
図は吸気絞弁の制御区域を示すグラフ、第５図は
吸気絞弁の開度と制御電圧の特性を示すグラフで
ある。
２……吸気通路、３……吸気絞弁、４……ソレ
ノイド、５……排気通路、７……触媒、８……排
気温度センサ、９……酸素濃度センサ、１０……
制御回路。
Fig. 1 is a claim correspondence diagram of this invention, Fig. 2 is a schematic configuration diagram showing an embodiment of this invention, Fig. 3 is a flowchart showing an example of control operation, and Fig. 4
This figure is a graph showing the control area of the intake throttle valve, and FIG. 5 is a graph showing the characteristics of the opening degree of the intake throttle valve and the control voltage. 2... Intake passage, 3... Intake throttle valve, 4... Solenoid, 5... Exhaust passage, 7... Catalyst, 8... Exhaust temperature sensor, 9... Oxygen concentration sensor, 10...
control circuit.
Claims (1)
ともに排気通路に触媒を設けたデイーゼルエンジ
ンにおいて、吸気通路に介装した吸気絞弁と、吸
気絞弁を開閉する駆動手段と、排気中の酸素濃度
を前記触媒よりも上流側にて検出する手段と、排
気温度を前記触媒よりも上流側にて検出する手段
と、排気温度が設定値以下の時にのみ排気中の酸
素濃度から空気過剰率を演算する手段と、この空
気過剰率が所定値になるように吸気絞弁の開度を
連続的に制御する手段を設けたことを特徴とする
アルコールエンジンの吸気装置。 In a diesel engine that uses alcohol as part or all of the fuel and has a catalyst in the exhaust passage, there is an intake throttle valve installed in the intake passage, a driving means for opening and closing the intake throttle valve, and an intake throttle valve that controls the oxygen concentration in the exhaust gas. means for detecting exhaust gas temperature upstream of the catalyst; means for detecting exhaust gas temperature upstream of the catalyst; and calculating an excess air ratio from the oxygen concentration in the exhaust gas only when the exhaust temperature is below a set value. 1. An intake system for an alcohol engine, comprising means for continuously controlling the opening of an intake throttle valve so that the excess air ratio becomes a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985146914U JPH0437237Y2 (en) | 1985-09-26 | 1985-09-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985146914U JPH0437237Y2 (en) | 1985-09-26 | 1985-09-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6256743U JPS6256743U (en) | 1987-04-08 |
| JPH0437237Y2 true JPH0437237Y2 (en) | 1992-09-02 |
Family
ID=31059807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985146914U Expired JPH0437237Y2 (en) | 1985-09-26 | 1985-09-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0437237Y2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5867939A (en) * | 1981-10-20 | 1983-04-22 | Nissan Motor Co Ltd | Mixture controller in alcohol-reformed gas engine |
| JPS58133439A (en) * | 1982-02-01 | 1983-08-09 | Nissan Motor Co Ltd | Air-fuel ratio controller of internal-combustion engine |
| JPS60138233A (en) * | 1983-12-27 | 1985-07-22 | Ikegai Corp | Diesel engine with air-charging throttle device |
-
1985
- 1985-09-26 JP JP1985146914U patent/JPH0437237Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6256743U (en) | 1987-04-08 |
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