JPS6166829A - Air-fuel ratio controller for gas engine - Google Patents
Air-fuel ratio controller for gas engineInfo
- Publication number
- JPS6166829A JPS6166829A JP19032884A JP19032884A JPS6166829A JP S6166829 A JPS6166829 A JP S6166829A JP 19032884 A JP19032884 A JP 19032884A JP 19032884 A JP19032884 A JP 19032884A JP S6166829 A JPS6166829 A JP S6166829A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- frequency
- optimum
- engine
- gas injector
- 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
- 239000000446 fuel Substances 0.000 title claims description 10
- 239000007789 gas Substances 0.000 claims abstract description 69
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 11
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 238000000746 purification Methods 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 101100233056 Caenorhabditis elegans ima-2 gene Proteins 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 く技術分野〉 本発明は、ガス機関の空燃比制御装置に関４゛ろ。[Detailed description of the invention] Technical fields> The present invention relates to an air-fuel ratio control device for a gas engine.
〈従来技術〉
ガス機関の空燃比制御装置は、排気管路途中の触媒の上
流側に取り付けられた酸素センサの出力をフィードバッ
クして吸気側で吸入空気に対するガス供給量を増減させ
るものであり、そのガス供給値の増減は、ガスインジェ
クタからのガス追加量を変更することによって行なって
いる。具体的には、ガス追加用のガスイノノエクタを４
０〜５０Ｈｚ程度のサイクル（ガスイノノエッグの才）
／オフ周波数）で駆動してガスを噴射しており、その各
サイクル毎のガス噴射時間を変更することによって、ガ
スの追加ｍを変更している。<Prior art> An air-fuel ratio control device for a gas engine increases or decreases the amount of gas supplied to intake air on the intake side by feeding back the output of an oxygen sensor installed upstream of a catalyst in the exhaust pipe. The gas supply value is increased or decreased by changing the amount of gas added from the gas injector. Specifically, 4 gas inonoectas for adding gas.
Cycle of about 0 to 50Hz (Gas Inono Egg's talent)
/ off frequency) to inject gas, and by changing the gas injection time for each cycle, the amount of additional gas m is changed.
さて、本件発明音が機関回転数と、ガスイノノエクタの
オン／オフ周波数と、三元触媒の浄化性能との関係につ
いて実験を重ねて検討したところ、機関回転数のいくつ
かの回転数領域に三元触媒の浄化性能が良好であるピー
クがそれぞれ現われろという事実、かつこのピークはガ
スインジェクタのオン／オフ周波数によって機関回転数
の増減する方向にずれて現われろという事実か判明した
。Now, after conducting repeated experiments and examining the relationship between the engine speed, the on/off frequency of the gas inonometer, and the purification performance of the three-way catalyst, it was found that the sound of the present invention is generated in several speed ranges of the engine speed. It was found that peaks indicating good purification performance of the catalyst appear, and that these peaks appear shifted in the direction of increasing or decreasing engine speed depending on the on/off frequency of the gas injector.
即ち、ある機関回転数に対しては、その回転数領域で浄
化性能が良好なピークが現われる最適なガスインジェク
タのオン／オフ周波数かあるわけで、今、機関回転数に
応じてガスインジェクタのオン／オフ周波数を前記した
最適の周波数に設定すれば、その機関回転数での触媒の
浄化性能が最も良好になることになる。In other words, for a certain engine speed, there is an optimal on/off frequency for the gas injector at which a peak with good purification performance appears in that speed range. /If the off-frequency is set to the optimum frequency described above, the purification performance of the catalyst at that engine speed will be the best.
ところで、従来のこの種装置は、ガスインジェクタのオ
ン／オフ周波数を一定周波敗に固定していたため、機関
回転数が変動すると、触媒の浄化性能が低下する欠点が
あった。このような欠点は、発電機駆動用のガス機関の
ように回転数がほとんど変動しない機関であれば問題に
ならないが、ヒートポンプ駆動用のガス機関のように回
転数にかなりの変動が生じるものでは、その回転数によ
っては浄化性能が低下するので、上記の欠点は大きな問
題となる。By the way, in conventional devices of this type, the on/off frequency of the gas injector was fixed at a constant frequency, so that when the engine speed fluctuated, the purification performance of the catalyst deteriorated. These drawbacks are not a problem in engines where the rotational speed hardly fluctuates, such as gas engines used to drive generators, but they do not occur in engines where the rotational speed fluctuates considerably, such as gas engines used to drive heat pumps. Since the purification performance decreases depending on the rotation speed, the above drawback becomes a big problem.
〈発明の目的〉
本発明は、上記従来の欠−１に鑑み、機関回転Ｃ１１［
に応した最適のガスインジェクタのオフ／Ａ）周波数を
選択することにより、機関回転数の変動に関係なく常に
良好な浄化性能か発揮されるようにすることを目的とす
る。<Object of the Invention> In view of the above-mentioned shortcomings of the conventional art, the present invention provides engine rotation C11[
The purpose is to ensure that good purification performance is always exhibited regardless of fluctuations in engine speed by selecting the optimal gas injector off/A) frequency according to the engine speed.
〈発明の構成〉
本発明は、上記の目的を達成するために、排気管路途中
の酸素センサの出力をフィートバッタして吸気側で吸入
空気に対４るガス供給−をカス追加用のガスインジェク
タにより増減させ、前ルこ触媒人口での空燃比が一定値
に保たれるよっ；１．ＩＩ御するガス機関の空燃比制御
装置において、機関の回転数を検出する手段と、ａｎ関
回回転に応した最適のガスインジェクタのオン／オフ周
波数を数表として記憶する手段と、酸素センサの出力に
基づいてガスインジェクタの駆動を制御する中央υ制御
部とを備え、前記中央制御部は、数表により機関回転数
からその回転数に最適のガスインジェクタのオン／オフ
周波数を検索してオン／オフ周波数をその最適周波数に
設定し、該オン／オフ周波数のもとでガスインジェクタ
を駆動しガス供給を行なうようにしたものである。<Configuration of the Invention> In order to achieve the above object, the present invention converts the output of an oxygen sensor in the middle of the exhaust pipe into a gas supply for adding gas to the intake air on the intake side. The air-fuel ratio at the front catalyst is maintained at a constant value by increasing and decreasing it with the injector; 1. An air-fuel ratio control device for a gas engine controlled by II includes a means for detecting the engine rotation speed, a means for storing an optimum gas injector on/off frequency according to the an-related rotation as a numerical table, and an oxygen sensor. and a central υ control unit that controls the drive of the gas injector based on the output, and the central control unit searches the engine rotation speed for the optimum on/off frequency of the gas injector for that rotation speed using a numerical table and turns on the gas injector. The /off frequency is set to the optimum frequency, and the gas injector is driven to supply gas under the on/off frequency.
〈実施例〉
以下、本発明を図面に示す実施例に基づいて詳細に説明
する。第１図は、本発明の一実施例の構成図であって、
同図中、符号ｌはガス機関の燃焼窓、２は吸気管、３は
排気管であり、吸気管２の上流側にはミキサ部４とスロ
ットル弁５とが配設されている。ミキサ部４にはガスの
主供給管６と副供給管７とが接続され、副供給管７の付
根部にはガス追加用のガスインジェクタ８が取着されて
いる。一方、排気管３には三元触媒９が介装され、その
入口側に酸素センサ１０が取り付けられている。１１は
機関にクランク軸に固着したリングギアで、外周に所定
数の歯を有しており、このリングギア１１の外周近傍に
は、機関の回転を検出する手段である回転センサ１２が
対設されている。<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 1 is a configuration diagram of an embodiment of the present invention,
In the figure, reference numeral 1 denotes a combustion window of the gas engine, 2 an intake pipe, and 3 an exhaust pipe. On the upstream side of the intake pipe 2, a mixer section 4 and a throttle valve 5 are arranged. A main gas supply pipe 6 and a sub-supply pipe 7 are connected to the mixer section 4, and a gas injector 8 for adding gas is attached to the base of the sub-supply pipe 7. On the other hand, a three-way catalyst 9 is interposed in the exhaust pipe 3, and an oxygen sensor 10 is attached to the inlet side of the three-way catalyst 9. A ring gear 11 is fixed to the crankshaft of the engine and has a predetermined number of teeth on its outer periphery.A rotation sensor 12, which is a means for detecting the rotation of the engine, is installed near the outer periphery of the ring gear 11. has been done.
１３はガバナであって、そのレバーがスロットル弁５に
連動し該スロットル弁５の開度をシ詞節するものである
。Reference numeral 13 denotes a governor whose lever is interlocked with the throttle valve 5 and controls the opening degree of the throttle valve 5.
１４はマイクロコノピユータで、１５はその中央制御部
（以下、ＣＰＵという）、１６は制御プログラムのほか
後述する数表を！ｉ！！する手段であるＲＯＭ、１７は
ＲＡＭである。酸素センサ１０の酸素検出信号はＡ／Ｄ
コンバータ１８を通してＣＰＵ１５に入力し、また前記
回転センサ１２の回転検出信号はカウノタ１９に人力し
そのカウノト敗がＣＰＵ１５に読み込まれろようになっ
ていろ。14 is a microcontroller, 15 is its central control unit (hereinafter referred to as CPU), and 16 is a control program as well as a numerical table described later! i! ! The ROM 17 is a RAM. The oxygen detection signal of the oxygen sensor 10 is A/D
The rotation detection signal from the rotation sensor 12 is input to the CPU 15 through the converter 18, and the rotation detection signal is inputted to the counter 19, and the counter output is read into the CPU 15.
ＣＰＵ１５の駆動命令は２チヤンネルのプログラマブル
タイマ２０に入力し、該プログラマブルタイマ２０はＣ
ＰＵ１５の駆動命令に応してフリップフロブプ回路２１
ヘセット信号とリセット（：号とを送出する。フリップ
フロップ回路２１は前記セット信号とリセット信号とか
らパルス幅変Ｎ信号を生成し、パワートランジスタ２２
は前記パルス幅変調信号を増幅してガスインジェクタ８
に送出して該ガスインジェクタ８を駆動する。The driving command of the CPU 15 is input to a two-channel programmable timer 20, and the programmable timer 20 is
The flip-flop circuit 21 responds to the drive command of the PU 15.
The flip-flop circuit 21 generates a pulse width variable N signal from the set signal and the reset signal, and the power transistor 22
amplifies the pulse width modulation signal and sends it to the gas injector 8.
to drive the gas injector 8.
しかして前記ＲＯＭ］６には、本件発明台が実験の結果
得た知見に基づく数表である、各機関回転数に応した最
適のガスインジェクタのオン／オフ周波数との関係を示
す数表か記憶されており、その数表は別表に示ｒ通りで
ある。Therefore, in the ROM]6, there is a numerical table based on the knowledge obtained by the present invention as a result of experiments, which shows the relationship between the optimum on/off frequency of the gas injector according to each engine speed. The numerical table is as shown in the attached table.
本別表
く数表〉
機関回転数 １ ガスインジェクタの１．１００
１ ４０
１．２００ １ ４５
１．３００ １ ４５
１．４０Ｑ ｌ ５０１．５ＱＱ
ｌ ４０１．６ＱＱ ｌ
４５１．７００ １ ４５
１．３０Ｑ ｌ ５０１．９００
ｌ ５０２．０００ １
４０
２．１００ １ ４０
２．２００ ｌ ４０２ＪＯＯｌ
４５
２．４０Ｏｉ ４５
２．５００ ｌ ４ ５表終
＊
上記の構成において、ＣＰＩＪ１５は＠累センサ１０の
出力に応した駆！ｌ１１命令をプログラマブルクイマ２
０、フリツブフロツブ回路２１を通してパワートランジ
スタ２２に送ってガスインジェクタ８を駆動しガス供給
量を増減するのであるが、その制御動作を第２図のフロ
ーチャートに基づいて詳細に説明する。Separate table of numbers〉 Engine speed 1 Gas injector 1.100
1 40 1.200 1 45 1.300 1 45 1.40Q l 501.5QQ
l 401.6QQ l
451.700 1 45 1.30Q l 501.900
l 502.000 1
40 2.100 1 40 2.200 l 402JOOl
45 2.40Oi 45 2.500 l 4 End of Table 5* In the above configuration, the CPIJ 15 operates according to the output of the @cumulative sensor 10! Programmable ima 2 with l11 instruction
The control operation will be explained in detail based on the flowchart of FIG. 2.
ステップＮ１において回転センサ１２からの回転検出信
号により機関回転数を検出し、ステップＮ２ではその機
関回転数から数表を参照し、その機関回転数に最適のガ
スインジェクタのオン／オフ周波数を検索する。例えば
機関回転数が１．５０Ｏｒｐｍであれば、ガスインジェ
クタ８のオン／オフ周波数が４０Ｈｚであり、回転数が
１．６０Ｏｒｐｍであれば、オン／オフ周波数が４５Ｈ
ｚである。In step N1, the engine rotation speed is detected by the rotation detection signal from the rotation sensor 12, and in step N2, a numerical table is referred to based on the engine rotation speed to search for the optimal gas injector on/off frequency for the engine rotation speed. . For example, if the engine speed is 1.50 Orpm, the on/off frequency of the gas injector 8 is 40Hz, and if the engine speed is 1.60 Orpm, the on/off frequency is 45H.
It is z.
ステップＮ３ではガスインジェクタ８のオン／オフ周波
数を、前ステップで検索された最ｊＩＦＲ波敗に変更し
、以下の所定の空燃比′ｊＩ４御のステップに移る。即
ち、ステップＮ３で酸素センサ１０からの酸素検出信ぢ
・を読み込み、ステップＮ４でその酸素検出信号に対応
する所要のガス供給量を算出し、前記最適のオン／オフ
周波数のらとで所要供給量のガスを噴射するようガスイ
ンジェクタ８への駆動命令を出力する。これによってガ
スインジェクタ８のオン／オフが前記最適の周波数で切
り換わっている状態のもとで、そのオンの期間毎に所要
時間ガスを噴射し所要量のガスを供給する。In step N3, the on/off frequency of the gas injector 8 is changed to the highest jIFR wave loss found in the previous step, and the process moves to the following step of controlling the predetermined air-fuel ratio 'jI4. That is, in step N3, the oxygen detection signal from the oxygen sensor 10 is read, and in step N4, the required gas supply amount corresponding to the oxygen detection signal is calculated, and the required gas supply amount is determined based on the optimum on/off frequency. A drive command is output to the gas injector 8 to inject the amount of gas. As a result, while the gas injector 8 is switched on/off at the optimum frequency, gas is injected for a required time every time the gas injector 8 is turned on, thereby supplying the required amount of gas.
なお、上記のステップＮｌ〜５の全ステップの動作タイ
ムは７０９ｓｓｅｃ 、であり、ステップＮ４〜５の空
燃比制御の動作タイムはその１０分の１の７０９ａｓｅ
ｃ、である。The operation time of all steps Nl to N5 above is 709ssec, and the operation time of the air-fuel ratio control of steps N4 to N5 is 709ssec, which is one-tenth of that.
c.
〈発明の効果〉
以上のように、本発明は、機関回転数を検出してその機
関回転数に応じた最適のガスインジェクタのオン／オフ
周波数を検索し、その最適のオン／オフ周波数のもとて
酸素検出信号に対応する所要ｍのガスを供給するように
したもので、機関回転数が変動した場合にら、その回転
数に応じたガスインジェクタのオン／オフ周波数か選択
設定されるから、機関回転数の変動に１でなう触媒のｌ
ｐ化性能の低下が未然に防止され、触媒の浄化性能を常
に良好な状態に保つことができる。<Effects of the Invention> As described above, the present invention detects the engine speed, searches for the optimum on/off frequency of the gas injector according to the engine speed, and calculates the optimum on/off frequency. This system is designed to supply the required amount of gas corresponding to the oxygen detection signal, and when the engine speed changes, the on/off frequency of the gas injector is selected and set according to the speed. , l of the catalyst which is 1 due to the fluctuation of the engine speed
Deterioration in p-conversion performance is prevented, and the purification performance of the catalyst can always be maintained in a good state.
第１図は本発明の一実施例の構成図、第２図はその制御
動作を示すフローチャートである。
ｌ−燃焼室、８ ガスインジェクタ、９・三元触媒、１
０・・酸素センサ、１２ ・回転センサ、１５・・ＣＰ
Ｕ（中央制御部）、１６・ｆｌＯＭ（記協手段）。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart showing its control operation. l-Combustion chamber, 8 Gas injector, 9/Three-way catalyst, 1
0... Oxygen sensor, 12 - Rotation sensor, 15... CP
U (central control unit), 16 flOM (public cooperation means).
Claims (1)
素センサの出力をフィードバックして吸気側で吸入空気
に対するガス供給量をガス追加用のガスインジェクタに
より増減させ、前記触媒入口での空燃比が一定値に保た
れるよう制御するガス機関の空燃比制御装置において、
機関の回転数を検出する手段と、各機関回転数に応じた
最適のガスインジェクタのオン／オフ周波数を数表とし
て記憶する手段と、酸素センサの出力に基づいてガスイ
ンジェクタの駆動を制御する中央制御部とを備え、前記
中央制御部は、数表により機関回転数からその回転数に
最適のガスインジェクタのオン／オフ周波数を検索して
オン／オフ周波数をその最適周波数に設定し、該オン／
オフ周波数のもとでガスインジェクタを駆動しガス供給
を行なうことを特徴とするガス機関の空燃比制御装置。(1) The output of the oxygen sensor installed upstream of the catalyst in the middle of the exhaust pipe is fed back to increase or decrease the amount of gas supplied to the intake air on the intake side using a gas injector for adding gas. In an air-fuel ratio control device for a gas engine that controls the fuel ratio to be maintained at a constant value,
A means for detecting the engine speed, a means for storing the optimum on/off frequency of the gas injector according to each engine speed as a numerical table, and a central control unit for controlling the drive of the gas injector based on the output of the oxygen sensor. and a control unit, the central control unit searches for an on/off frequency of the gas injector that is optimum for the engine rotation speed from the engine rotation speed using a numerical table, sets the on/off frequency to the optimum frequency, and sets the on/off frequency to the optimum frequency, and /
An air-fuel ratio control device for a gas engine, characterized by driving a gas injector at an off frequency to supply gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19032884A JPS6166829A (en) | 1984-09-11 | 1984-09-11 | Air-fuel ratio controller for gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19032884A JPS6166829A (en) | 1984-09-11 | 1984-09-11 | Air-fuel ratio controller for gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6166829A true JPS6166829A (en) | 1986-04-05 |
Family
ID=16256353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19032884A Pending JPS6166829A (en) | 1984-09-11 | 1984-09-11 | Air-fuel ratio controller for gas engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6166829A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57191436A (en) * | 1981-05-19 | 1982-11-25 | Automob Antipollut & Saf Res Center | Air-fuel ratio control device |
| JPS57195828A (en) * | 1981-05-26 | 1982-12-01 | Mitsubishi Electric Corp | Air-fuel ratio controller of otto cycle engine |
-
1984
- 1984-09-11 JP JP19032884A patent/JPS6166829A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57191436A (en) * | 1981-05-19 | 1982-11-25 | Automob Antipollut & Saf Res Center | Air-fuel ratio control device |
| JPS57195828A (en) * | 1981-05-26 | 1982-12-01 | Mitsubishi Electric Corp | Air-fuel ratio controller of otto cycle engine |
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