JPS60153461A - Air-fuel ratio controller for gas engine - Google Patents
Air-fuel ratio controller for gas engineInfo
- Publication number
- JPS60153461A JPS60153461A JP59009355A JP935584A JPS60153461A JP S60153461 A JPS60153461 A JP S60153461A JP 59009355 A JP59009355 A JP 59009355A JP 935584 A JP935584 A JP 935584A JP S60153461 A JPS60153461 A JP S60153461A
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel ratio
- gas
- fuel
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000004044 response Effects 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 abstract description 3
- 230000009849 deactivation Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 25
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- GVGLGOZIDCSQPN-PVHGPHFFSA-N Heroin Chemical compound O([C@H]1[C@H](C=C[C@H]23)OC(C)=O)C4=C5[C@@]12CCN(C)[C@@H]3CC5=CC=C4OC(C)=O GVGLGOZIDCSQPN-PVHGPHFFSA-N 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
- F02D41/1488—Inhibiting the regulation
- F02D41/149—Replacing of the control value by an other parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0278—Port fuel injectors for single or multipoint injection into the air intake system
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/04—Gas-air mixing apparatus
- F02M21/047—Venturi mixer
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
【発明の詳細な説明】
く技術分野〉
本発明は、機関の負荷状態に応じて空燃比を切替えるガ
ス機関の空燃比制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an air-fuel ratio control device for a gas engine that switches the air-fuel ratio according to the load condition of the engine.
〈従来技術〉
排ガス中に配置されたαセンサによる検出信号をフィー
ドバックして、排ガスに含まれる酸素濃度に応じてリッ
チ（ＲＩＣＨ）／リーン（ＬＥＡＮ）状態を判定し、予
め機関回転数に応じて設定されたスロットル開度をしき
い値として、大きな出力の必要な高負荷時にはガスイン
ジェクタから所定量のガス燃料を追加供給してλ＝１．
０運転を行ない、また低負荷時には追加供給を停止して
熱効率の高いλ＝１．４運転を行なうことにより、空燃
比を制御するようにしたガス機関についての提案を、本
出願人は既に特願昭５８−９］８４６号等によって行な
っている。<Prior art> The detection signal from the α sensor placed in the exhaust gas is fed back to determine the rich (RICH)/lean (LEAN) state according to the oxygen concentration contained in the exhaust gas, and the detection signal is determined in advance according to the engine speed. Using the set throttle opening as a threshold, at high loads that require a large output, a predetermined amount of gas fuel is additionally supplied from the gas injector, and λ=1.
The applicant has already proposed a gas engine in which the air-fuel ratio is controlled by performing zero operation, stopping additional supply at low loads, and performing λ = 1.4 operation with high thermal efficiency. Application No. 58-9] No. 846, etc.
しかしながら、このようなガス機関においては、機関始
動直後の０２センサの周辺温度が低い時には０２センサ
の内部抵抗が極めて高い不活性な状態にあるため、０２
センサの出力電圧は排ガスの酸素濃度を正確に表わさな
い。従って、この期間中に過負荷状態となってλ、＝１
．０運転が必要となった場合に、０２センサの検出信号
をフィードバックしてλ＝１．０制御を行なうと、０２
センサの出力状態によって空燃比が過濃あるいは過薄に
なり、排気エミッションが悪化するだけでなく、機関の
運転そのものが不可能となって機関が停止してしまうよ
うな事態が生ずるという可能性があった。However, in such a gas engine, when the ambient temperature of the 02 sensor is low immediately after the engine starts, the 02 sensor is in an inactive state with extremely high internal resistance.
The output voltage of the sensor does not accurately represent the oxygen concentration of the exhaust gas. Therefore, during this period, an overload condition occurs and λ,=1
．． When zero operation is required, if the detection signal of the 02 sensor is fed back and λ=1.0 control is performed, the 02
Depending on the output state of the sensor, the air-fuel ratio may become too rich or too lean, which not only worsens exhaust emissions, but also makes it impossible to operate the engine itself, potentially causing the engine to stop. there were.
〈発明の目的〉
本発明は」二連のような問題点に着目し、機関始動直後
の０２センサが不活性な状態にある場合の過負荷時にお
いて、排気エミッションの悪化や機関停止等を防止する
ようにしたガス機関の空燃比制御装置を提供することを
目的としてなされたものである。<Purpose of the Invention> The present invention focuses on problems such as "double train" and prevents deterioration of exhaust emissions and engine stoppage in the event of an overload when the 02 sensor is in an inactive state immediately after engine startup. The purpose of this invention is to provide an air-fuel ratio control device for a gas engine which is configured to do the following.
〈発明の構成〉
」１記の目的を達成するために、本発明は排ガス中に配
置された０２センサによる検出信号に応じてインジェク
タから所定量のガス燃料を追加供給することにより空燃
比を制御する空燃比制御手段と、予め機関回転数に応じ
て設定されたスロットル開度をしきい値として前記空燃
比制御手段の作動を切替える空燃比切替え手段とを備え
たガス機関において、０２センサが不活性となる機関始
動直後の一定期間中での過負荷時における機関回転数と
スロットル開度に対するガス燃料の追加供給量の関係を
予め記憶させた記憶手段と、上記過負荷時において、０
２センサによる検出信号によらず」−記記憶手段の記憶
内容に基づきガス燃料の追加供給量を決定し、インジェ
クタを制御する制御信号を出力する演算手段、とを備え
たことを特徴としており、機関始動直後の過負荷に対応
した適正な運転が可能となるのである。<Configuration of the Invention> In order to achieve the object described in item 1, the present invention controls the air-fuel ratio by additionally supplying a predetermined amount of gas fuel from an injector in response to a detection signal from an 02 sensor placed in exhaust gas. In a gas engine equipped with an air-fuel ratio control means for controlling the air-fuel ratio, and an air-fuel ratio switching means for switching the operation of the air-fuel ratio control means using a throttle opening set in advance according to the engine speed as a threshold, the 02 sensor is malfunctioning. A memory means that stores in advance the relationship between the additional supply amount of gas fuel with respect to the engine rotational speed and the throttle opening during an overload during a certain period immediately after starting the engine to become active;
2, a calculating means for determining the additional supply amount of gas fuel based on the contents stored in the storage means and outputting a control signal for controlling the injector, regardless of the detection signal from the two sensors, This enables proper operation in response to overloads immediately after the engine starts.
〈実施例〉
以下、図示の一実施例により本発明を具体的に説明する
。<Example> The present invention will be specifically described below with reference to an illustrated example.
３−
第１図は概念系統図であり、（１）はガス機関、（２）
はミキサー、（３）はスロツ１〜ル、（４）は電子ガバ
ナ、（５）はスロッ１ヘル（３）の開度検出器、（６）
はガスインジェクタ、（７）は排気管、（８）は三元触
媒、（９）は０２センサ、（１０）は回転数検出器、（
１１）はマイクロコンピュータである。3- Figure 1 is a conceptual system diagram, (1) is a gas engine, (2)
is the mixer, (3) is the slot 1 to 1, (4) is the electronic governor, (5) is the opening detector for slot 1 (3), (6)
is the gas injector, (7) is the exhaust pipe, (8) is the three-way catalyst, (9) is the 02 sensor, (10) is the rotation speed detector, (
11) is a microcomputer.
ミキサー（２）は、空燃比をλ＝１．４に保つように予
め設定されており、燃料ガス（１５ａ）と空気（１６）
はミキサー（２）で混合された後、スロットル（３）を
経て機関（１）に供給され、排気管（７）に排出された
排ガス（１７）は三元触媒（８）を経て排気される。ス
ロットル開度は、電子ガバナ（４）により開度を制御さ
れるスロットル（３）のシャフトに取付けられている例
えばポテンショメータからなる開度検出器（５）によっ
て検出され、その出力はマイクロコンピュータ（１１）
に送られる。また機関（１）の回転数は、機関（１）の
リングギヤ部（１８）に取付けられている例えば電磁ピ
ックアップからなる回転数検出器（１０）によって検出
され、その出力はマイクロコンピュータ（１１）に送ら
れる。The mixer (2) is preset to maintain the air-fuel ratio at λ = 1.4, and mixes the fuel gas (15a) and air (16).
is mixed in the mixer (2) and then supplied to the engine (1) via the throttle (3), and the exhaust gas (17) discharged into the exhaust pipe (7) is exhausted via the three-way catalyst (8). . The throttle opening is detected by an opening detector (5), for example, a potentiometer, which is attached to the shaft of the throttle (3) whose opening is controlled by an electronic governor (4), and its output is detected by a microcomputer (11). )
sent to. Further, the rotation speed of the engine (1) is detected by a rotation speed detector (10), for example, an electromagnetic pickup, which is attached to the ring gear section (18) of the engine (1), and its output is sent to the microcomputer (11). Sent.
４−
マイクロコンピュータ（１１）は、Ｃｒ”Ｕ（２］）、
ＲＯＭ（２２）、ＲＡＭ （２３）、Ｉ１０ポート（２
４）、システムパスライン（２５）等を備えており、開
度検出器（５）のアナログ出力は、Ａ／ｒｌコンバータ
（２６）でデジタル量に変換されてマイクロコンピュー
タ（１１）に入力され、また０２センサ（９）の検出信
号も、Ａ／Ｄコンバータ（２６）を通してマイクロコン
ピュータ（１１）に入力される。また回転数検出器（１
０）のパルス出力は、カウンタ（２７）でカウントして
マイクロコンピュータ（１１）に入力される。ＲＯＭ（
２２）には、演勢制御用のプログラムのほか、αセンサ
（９）が不活性となる機関始動直後の一定期間中での過
負荷時に適用される機関回転数とスロットル開度に対す
るガス燃料の追加供給量の関係を数表、あるいは計算式
の形で記憶させてあり、該当する運転領域では、ＣＰＵ
（２１）は検出された機関回転数とスロットル開度に応
じた制御信号をＩ１０ポー１−（２／Ｉ）から１７０信
号の形で出力し、パワーｌ−ランラスタアレイ（２８）
で増幅された信号により任意のデユーティでガスインジ
ェクタ（６）が駆動され、ガス燃料（］５１））が追加
供給される。4- The microcomputer (11) is Cr”U(2]),
ROM (22), RAM (23), I10 port (2
4), a system path line (25), etc. are provided, and the analog output of the opening degree detector (5) is converted into a digital quantity by the A/rl converter (26) and input to the microcomputer (11). The detection signal of the 02 sensor (9) is also input to the microcomputer (11) through the A/D converter (26). There is also a rotation speed detector (1
The pulse output of 0) is counted by a counter (27) and input to the microcomputer (11). ROM(
22) includes a program for performance control, as well as a program for controlling the gas fuel for the engine speed and throttle opening applied during an overload during a certain period immediately after engine startup when the α sensor (9) becomes inactive. The relationship between the additional supply amount is stored in the form of a numerical table or calculation formula, and in the corresponding operating range, the CPU
(21) outputs a control signal in the form of a 170 signal from I10 port 1-(2/I) according to the detected engine speed and throttle opening, and the power l-run raster array (28)
The gas injector (6) is driven at an arbitrary duty by the signal amplified by the signal, and gas fuel (]51) is additionally supplied.
次に、第２図のフローチャートを参照しながら本装置の
動作を説明する。Next, the operation of this apparatus will be explained with reference to the flowchart in FIG.
マイクロコンピュータ（１１）のＣＩ”１Ｊ（２１）は
、予め設定されたインターバルタイムで機関回転数Ｎｍ
とスロットル開度Ｓｍを検出しており（ステップ１）、
検出後ステップ２でλの設定値を判定する。そしてλ＝
１．４にある場合には、λ＝１．０へ切替えるスロット
ル開度のしきい値５１＝ｆ Ｈ（Ｎｍ）を演算し、ある
いは数表から算出しくステップ３）、次のステップ４で
Ｓｍと８１とを比較してＳｍ≧８１となった場合は、一
定のインジェクタデユーティＩＤ＝ｇ（０）でインジェ
クタ（６）を作動させて所定量のガス燃料を追加供給す
ることにより、λ＝１．０運転に切替えるような制御信
号が算出される（ステップ５）。CI"1J (21) of the microcomputer (11) controls the engine speed Nm at a preset interval time.
and throttle opening Sm are detected (step 1),
After the detection, in step 2, the set value of λ is determined. and λ=
1.4, calculate the throttle opening threshold value 51=fH (Nm) for switching to λ=1.0, or calculate it from the numerical table in step 3), and then in step 4, set Sm If Sm≧81 is found by comparing Sm≧81, by operating the injector (6) at a constant injector duty ID=g(0) and additionally supplying a predetermined amount of gas fuel, λ= A control signal for switching to 1.0 operation is calculated (step 5).
また設定値がλ＝１．０にある場合は、ステップ６でλ
＝１．４へ切替えるスロワ１−ル開度のしきい値Ｓ２
＝ｆ２ （Ｎｍ）をめ、ステップ７でＳｍ＜８２となっ
た時点でインジェクタ（６）の作動を停止しくＩＤ＝０
）、λ＝１．４に切替えるような制御信号が算出される
（ステップ８）。Also, if the set value is λ = 1.0, λ
Threshold value S2 of throttle opening to switch to =1.4
= f2 (Nm), and stop the operation of the injector (6) when Sm<82 in step 7. ID=0
), a control signal for switching to λ=1.4 is calculated (step 8).
λの設定値が１．０であり、しかもステップ７でＳ ｍ
＜８２でなかった場合には、ステップ９で始動後の経
過時間を判定する。そして一定の設定時間、例えば３分
を超えていれば０２センサ（９）は活性状態にあると判
断し、０２センサ（９）の検出信号をフィードバックし
てそのリッチ／リーンを判定しくステップ１０）、イン
ジェクタデユーティ１Ｄをダウンあるいはアップさせる
制御信号が出力される（ステップ１１）。また始動後３
分以内の場合には、０２センサ（９）は活性状態になく
検出信号をフィー１くバックできないと判定し、実際の
スコツ１ヘル開度Ｓｍとλ、＝１．／Ｉへ切替えるしき
い値Ｓ２との差ΔＳをめ、予め試験によってめた機関回
転数とスロットル開度に対応する燃料を追加供給するよ
うな制御信号ＴＤ＝ｇ（ΔＳ）が算出される（ステップ
１２）。The set value of λ is 1.0, and S m
If not <82, the elapsed time after startup is determined in step 9. If it exceeds a certain set time, for example 3 minutes, it is determined that the 02 sensor (9) is in an active state, and the detection signal of the 02 sensor (9) is fed back to determine whether it is rich or lean (step 10). , a control signal is output to lower or raise the injector duty 1D (step 11). Also after starting 3
If within 1 minute, it is determined that the 02 sensor (9) is not in an active state and cannot feed back the detection signal, and the actual Scot 1 hel opening Sm and λ, = 1. /I, the control signal TD=g(ΔS) is calculated to additionally supply fuel corresponding to the engine speed and throttle opening determined in advance by testing. Step 12).
このようにしてそれぞれの場合に応じた制御信号がイン
ジェクタ（６）に出力され、燃料（Ｉｌｂ）が追加供給
されて空燃比は所定の値に維持されるのである（ステッ
プ１３）。なお上述のしきい値とじて７−
用いられるスロットル開度関数ｆ ＋ （Ｎｍ） 、ｆ
２ （Ｎｍ）及び燃料の追加供給量をめるインジェク
タデユーティ関数ｇ（ΔＳ）等は、機関の型式や容量な
どに応じて予め行なわれる試験によって設定されるもの
である。また、ステップ９で０２センサが活性化される
までの時間を３分としているが、これは−例であって機
関に応じて適宜設定すればよい。In this way, a control signal corresponding to each case is output to the injector (6), fuel (Ilb) is additionally supplied, and the air-fuel ratio is maintained at a predetermined value (step 13). Note that the above threshold value is 7- Throttle opening function f + (Nm), f
2 (Nm) and the injector duty function g (ΔS), which calculates the additional supply amount of fuel, are set by tests conducted in advance depending on the type and capacity of the engine. Further, although the time required until the 02 sensor is activated in step 9 is set to 3 minutes, this is just an example and may be set as appropriate depending on the engine.
第３図は、ＲＯＭ（２２）に記憶させておき、ステップ
１２でインジェクタデユーティＩＤをめる場合に用いる
数表あるいは計算式の一例をグラフの形で示したもので
あり、縦軸のスロットル開度の数値はスロットル開度検
出器の検出出力をデジタル値に変換して得られた無次元
数である。また、インジェクタデユーティ関数ｇ（ΔＳ
）は、排気エミッションを低減するためにλ＝１．０よ
り若干濃いめになるように設定される。FIG. 3 is a graph showing an example of a numerical table or calculation formula stored in the ROM (22) and used to determine the injector duty ID in step 12. The numerical value of the opening degree is a dimensionless number obtained by converting the detection output of the throttle opening degree detector into a digital value. Also, the injector duty function g(ΔS
) is set to be slightly darker than λ=1.0 in order to reduce exhaust emissions.
〈発明の効果〉
以上の実施例の説明から明らかなように、本発明は、機
関始動直後で０２センサがまだ不活性な状態にある時に
は、過負荷になっても０２センサの検８−
小信号を用いず、そのような運転状態になった場合のた
めに予め用意されている記憶内容に基づいて、ガス燃料
の追加供給量を決定してインジェクタを制御するもので
あり、適切でない０２センサの出力によって排気エミッ
ションが悪化したり機関が停止したりすることが防止さ
れ、ガス機関を常に適正な空燃比で運転することが可能
となる利点がある。<Effects of the Invention> As is clear from the description of the embodiments above, the present invention allows the detection of the 02 sensor even if an overload occurs when the 02 sensor is still in an inactive state immediately after the engine is started. The injector is controlled by determining the additional supply amount of gas fuel based on the stored contents prepared in advance in case such an operating state occurs, without using a signal, and the inappropriate 02 sensor This output prevents deterioration of exhaust emissions and engine stoppage, and has the advantage that the gas engine can always be operated at an appropriate air-fuel ratio.
第１図は本発明の一実施例の概念系統図、第２図は制御
フローチャート、第３図は対象となる運転領域における
機関回転数とスロットル開度に対するインジェクタデユ
ーティの関係の一例を示す図である。
（１）・・・・ガス機関、（２）・・・・ミキサー、（
３）・・・・スロットル、（５）・・・・開度検出器、
（６）・・・・ガスインジェクタ、（７）・・・・排気
管、（９）・・・・０２センサ、（１０）・・・・回転
数検出器、（１１）・・・・マイクロコンピュータ、（
２１）・・・・ｃｐｕ、（２２）・・・・ＲＯＭ。Fig. 1 is a conceptual system diagram of an embodiment of the present invention, Fig. 2 is a control flowchart, and Fig. 3 is a diagram showing an example of the relationship between the injector duty and the engine speed and throttle opening in the target operating range. It is. (1)...Gas engine, (2)...Mixer, (
3)...throttle, (5)...opening detector,
(6)...Gas injector, (7)...Exhaust pipe, (9)...02 sensor, (10)...Rotation speed detector, (11)...Micro Computer,(
21)...CPU, (22)...ROM.
Claims (1)
に応じてインジェクタから所定量のガス燃料を追加供給
することにより空燃比を制御する空燃比制御手段と、予
め機関回転数に応じて設定されたスロットル開度をしき
い値として前記空燃比制御手段の作動を切替える空燃比
切替え手段とを備えたガス機関において、 ０２センサが不活性となる機関始動直後の一定期間中で
の過負荷時における機関回転数とスロットル開度に対す
るガス燃料の追加供給量の関係を予め記憶させた記憶手
段と、 上記過負荷時において、０２センサによる検出信号によ
らず」１記記憶手段の記憶内容に基づきガス燃料の追加
供給量を決定し、インジェクタを制御する制御信号を出
力する演算手段。 とを備えたことを特徴とするガス機関の空燃比制御装置
。(1) An air-fuel ratio control means that controls the air-fuel ratio by additionally supplying a predetermined amount of gas fuel from the injector in response to a detection signal from an 02 sensor placed in the exhaust gas, and and an air-fuel ratio switching means for switching the operation of the air-fuel ratio control means using a throttle opening as a threshold value, in the case of an overload during a certain period immediately after starting the engine when the 02 sensor becomes inactive. A storage means that stores in advance the relationship between the additional supply amount of gas fuel and the engine speed and the throttle opening; Calculation means that determines the additional supply amount of fuel and outputs a control signal to control the injector. An air-fuel ratio control device for a gas engine, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59009355A JPS60153461A (en) | 1984-01-20 | 1984-01-20 | Air-fuel ratio controller for gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59009355A JPS60153461A (en) | 1984-01-20 | 1984-01-20 | Air-fuel ratio controller for gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60153461A true JPS60153461A (en) | 1985-08-12 |
Family
ID=11718152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59009355A Pending JPS60153461A (en) | 1984-01-20 | 1984-01-20 | Air-fuel ratio controller for gas engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60153461A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60169659A (en) * | 1984-02-14 | 1985-09-03 | Yanmar Diesel Engine Co Ltd | Air-fuel ratio control device of gas engine |
| CN112324580A (en) * | 2020-11-04 | 2021-02-05 | 潍柴动力股份有限公司 | Engine air-fuel ratio control method, device and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5713733A (en) * | 1980-06-16 | 1982-01-23 | Emhart Ind | Capacitor |
| JPS58214656A (en) * | 1982-06-07 | 1983-12-13 | Yanmar Diesel Engine Co Ltd | Controller for gas fuel engine |
| JPS59185846A (en) * | 1983-04-05 | 1984-10-22 | Mitsubishi Motors Corp | Air-fuel ratio controller for internal-combustion engine |
-
1984
- 1984-01-20 JP JP59009355A patent/JPS60153461A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5713733A (en) * | 1980-06-16 | 1982-01-23 | Emhart Ind | Capacitor |
| JPS58214656A (en) * | 1982-06-07 | 1983-12-13 | Yanmar Diesel Engine Co Ltd | Controller for gas fuel engine |
| JPS59185846A (en) * | 1983-04-05 | 1984-10-22 | Mitsubishi Motors Corp | Air-fuel ratio controller for internal-combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60169659A (en) * | 1984-02-14 | 1985-09-03 | Yanmar Diesel Engine Co Ltd | Air-fuel ratio control device of gas engine |
| JPH037022B2 (en) * | 1984-02-14 | 1991-01-31 | Yanmar Diesel Engine Co | |
| CN112324580A (en) * | 2020-11-04 | 2021-02-05 | 潍柴动力股份有限公司 | Engine air-fuel ratio control method, device and system |
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