JPS59200049A - Air-fuel ratio control mechanism for heat pump driving gas engine - Google Patents
Air-fuel ratio control mechanism for heat pump driving gas engineInfo
- Publication number
- JPS59200049A JPS59200049A JP58071510A JP7151083A JPS59200049A JP S59200049 A JPS59200049 A JP S59200049A JP 58071510 A JP58071510 A JP 58071510A JP 7151083 A JP7151083 A JP 7151083A JP S59200049 A JPS59200049 A JP S59200049A
- Authority
- JP
- Japan
- Prior art keywords
- fuel ratio
- air
- throttle valve
- heat pump
- control mechanism
- 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 75
- 230000007246 mechanism Effects 0.000 title claims description 26
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract 2
- 230000001351 cycling effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 3
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 description 1
- 101100524639 Toxoplasma gondii ROM3 gene Proteins 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- 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
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0284—Arrangement of multiple injectors or fuel-air mixers per combustion chamber
-
- 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)
Abstract
Description
【発明の詳細な説明】
この発明は空燃比切換時に機関回転数変動によるハンチ
ングを防止することができるヒートポンプ駆動用ガス機
関の空燃比制御機構に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-fuel ratio control mechanism for a gas engine for driving a heat pump, which can prevent hunting due to fluctuations in engine speed when changing the air-fuel ratio.
一般に、ヒートポンプをガス機関を用いて駆動する場合
、そのガス機関の調速機構としてステップモータをアク
チュエータとする簡易形電子ガバナを用いた時は、空気
過剰率λ（λ二供給空燃比／理論空燃比）を、例えばλ
＝１とλ＝１４との間で切り換えて空燃比制御を行なう
と、簡易形の調速機構であるだめに空燃比変動によって
生じる回転数変動を吸収しきれず、数百ｒｐｍの大きな
機関回転数が生じてしまう。Generally, when a heat pump is driven using a gas engine, when a simple electronic governor with a step motor as an actuator is used as the speed regulating mechanism of the gas engine, the excess air ratio λ (λ2 supply air fuel ratio / theoretical air fuel ratio), for example λ
When air-fuel ratio control is performed by switching between = 1 and λ = 14, the simple speed regulating mechanism cannot absorb the rotational speed fluctuations caused by air-fuel ratio fluctuations, and the engine speed increases by several hundred rpm. will occur.
そして、あらかじめ機関回転数に応じて決定されるスロ
ットル弁開度をしきい値として実際のスロットル弁開度
との偏差を求め、この偏差の大小により空燃比制御機構
゛をオン、オフし、空燃比切換を行なうと、前記機関回
転数変動により空燃比切換時にスロットル弁開度も大き
く変化し、また空燃比切換前の状態に戻るというように
λの値が頻繁に切り換る。いわゆるサイクリングが生じ
、これによって回転変動が助長されて振幅の大きな・・
ンチングを起こして調速不可能になってしまうという不
具合がある。Then, the deviation from the actual throttle valve opening is determined using the throttle valve opening determined in advance according to the engine speed as a threshold value, and the air-fuel ratio control mechanism is turned on or off depending on the magnitude of this deviation. When the fuel ratio is switched, the throttle valve opening also changes greatly due to the engine speed fluctuation, and the value of λ changes frequently, such as returning to the state before the air-fuel ratio switching. So-called cycling occurs, which promotes rotational fluctuations and causes large amplitude...
There is a problem in that the speed control becomes impossible due to pinching.
この発明の目的は前記従来のヒートポンプ駆動用ガス機
関の空燃比制御機構の有する欠点を解消し、空燃比切換
時に機関の回転数変動を最小限に抑えることができ、機
関回転変動によって生じる空燃比切換えのサイクリング
を防止することができる優れたヒートポンプ駆動用ガス
機関の空燃比制御機構を提供することである。It is an object of the present invention to eliminate the drawbacks of the air-fuel ratio control mechanism of the conventional gas engine for driving a heat pump, to minimize engine rotational speed fluctuations when changing the air-fuel ratio, and to minimize air-fuel ratio fluctuations caused by engine rotational fluctuations. An object of the present invention is to provide an excellent air-fuel ratio control mechanism for a gas engine for driving a heat pump, which can prevent switching cycling.
前記目的を達成するだめに、この発明では、ステップモ
ータを用いてスロットル弁を任意開度に操作することに
より、ヒートポンプ負荷に応じた機関回転数に制御する
方式の調速機構と、インジェクタにより所定量の燃料を
追加する方式のφ燃比制御機構とを有し、機関回転数に
応じて決定されるスロットル弁開度をしきい値として実
際のスロットル弁開度を判定し、その結果により前記空
燃比制御機構の作動をオン、オフすることにより空燃比
切換を行なうヒートポンプ駆動ガス機関において、空燃
比切換後、インジェクタのオン、オフに合わせて、スロ
ットル弁を閉方向、開方向に操作することにより空燃比
切換による機関回転変動を最小に抑え、さらに、空燃比
切換後、ある一定の空燃比切換禁止期間を設けることに
より、回転変動によって生じる空燃比切換のサイクリン
グを防止するようにしたことを特徴としている。In order to achieve the above object, the present invention uses a speed regulating mechanism that controls the engine speed according to the heat pump load by operating the throttle valve to an arbitrary opening using a step motor, and a speed regulating mechanism that controls the engine speed according to the heat pump load. It has a φ fuel ratio control mechanism that adds a fixed amount of fuel, and uses the throttle valve opening determined according to the engine speed as a threshold to determine the actual throttle valve opening, and based on the result, the In a heat pump-driven gas engine that switches the air-fuel ratio by turning on and off the operation of the fuel ratio control mechanism, after switching the air-fuel ratio, by operating the throttle valve in the closing direction and opening direction in accordance with the on and off of the injector. It is characterized by minimizing engine rotational fluctuations due to air-fuel ratio switching, and furthermore, by setting a certain period during which air-fuel ratio switching is prohibited after air-fuel ratio switching, cycling of air-fuel ratio switching caused by rotational fluctuations is prevented. It is said that
以下図面を用いてこの発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.
第１図はこの発明のヒートポンプ駆動用ガス機関の空燃
比制御機構の・・−ドウエアの構成説 。FIG. 1 is a structural theory of the air-fuel ratio control mechanism of a gas engine for driving a heat pump according to the present invention.
門口である。It is the gateway.
ガス機関２０の吸気管２１のベンチュリ２４にはガス導
入管２６が設けられておシ、吸気管２１のその下流側に
はガスインジェクタ１４．ＥＧＲ管１８が接続して、ミ
キザ一部２６を形成している。そして、このミキザ一部
２６の下流側、にはさらに、スロットル弁２２が設けら
れており、その回転軸２２ａは前記吸気管２１の外部で
連結部拐１６を介してステップモータ１２に接続してい
る。このステップモータ１２は、入力される制御信号の
／クルレス数に対応したステップ数だけ回転角度が調整
されるものであり、ステップモータ１２の回転によりス
ロットル弁２２が操作されるようになっている。また、
ガス機関２０のフライホイール２５等の回転部分には回
転数センサ１１が取シ付けられていて、ガス機関２０の
実際の回転数を検出できるようになっている。２７は吸
気弁、２８は排気弁、２９はピストンである。A gas introduction pipe 26 is provided in the venturi 24 of the intake pipe 21 of the gas engine 20, and a gas injector 14 is provided on the downstream side of the intake pipe 21. EGR pipe 18 is connected to form mixer portion 26 . A throttle valve 22 is further provided on the downstream side of the mixer part 26, and its rotating shaft 22a is connected to the step motor 12 via the connecting part 16 outside the intake pipe 21. There is. The rotation angle of the step motor 12 is adjusted by the number of steps corresponding to the /clueless number of the input control signal, and the throttle valve 22 is operated by the rotation of the step motor 12. Also,
A rotation speed sensor 11 is attached to rotating parts such as the flywheel 25 of the gas engine 20, so that the actual rotation speed of the gas engine 20 can be detected. 27 is an intake valve, 28 is an exhaust valve, and 29 is a piston.
さらに、前記ガス機関２０の排気管１９には前記ＥＧＲ
管１８の他端が接続しており、その下流側には０２セン
ザ１５が配置されており、そのさらに下流側には三元触
媒１６が設けられている。Further, the exhaust pipe 19 of the gas engine 20 has the EGR
The other end of the pipe 18 is connected, and an 02 sensor 15 is disposed on the downstream side thereof, and a three-way catalyst 16 is disposed further downstream thereof.
１７は前記ＥＧＲ管１８の途中に設けられたＥＧＲ弁で
アリ、コントロールユニット１０からの信号によりこの
ＥＧＲ管１８を開閉する。このＥＧＲ弁１７および前記
ステップモータ１２．ガスインジェクタ１４は後述する
コントロールユニット１０の増幅器８に接続している。Reference numeral 17 denotes an EGR valve provided in the middle of the EGR pipe 18, which opens and closes the EGR pipe 18 in response to a signal from the control unit 10. This EGR valve 17 and the step motor 12. The gas injector 14 is connected to an amplifier 8 of a control unit 10, which will be described later.
そして、前記のように構成されたガス機関２００回転数
を制御するコントロールユニット１０には、ＣＰＵ２．
ＲＯＭ３．ＲＡＭ４．Ｉんポート５からなるマイクロコ
ンピュータ１．前記回転数センサ１１に接続し、ガス機
関２０の回転数を計数してデジタル信号として出力する
カウンタ６゜図示しないヒートポンプからのヒートポン
プ負荷に応じた設定回転数信号や前記０２センサ１５か
らの残留酸素量信号をマイクロコンピュータ１に入力す
るためにデジタル信号に直すＡ／／Ｄ変換器７等が内蔵
されており、それぞれはノくスライン９で互いに連絡さ
れている。８は増幅器であり、Ｉ１０ポート５から出力
される制御信号。を増幅し、ステップモータ１２．ガス
インジェクタ１４、ＥＧＲ弁１７を駆動するようになっ
ている。The control unit 10 that controls the rotation speed of the gas engine 200 configured as described above includes a CPU 2.
ROM3. RAM4. A microcomputer consisting of an I port 5 1. A counter 6 connected to the rotation speed sensor 11 counts the rotation speed of the gas engine 20 and outputs it as a digital signal.The counter 6 counts the rotation speed of the gas engine 20 and outputs it as a digital signal. An A//D converter 7 for converting a quantity signal into a digital signal for inputting it to the microcomputer 1 is built-in, and these are connected to each other by a cross line 9. 8 is an amplifier, and a control signal is output from I10 port 5. and step motor 12. It drives the gas injector 14 and EGR valve 17.
以上のように構成されたヒートポンプ駆動用ガス機関の
空燃比制御機構において、調速制御と空燃比制御の基本
的な制御は従来と同じ方式で行なう。すなわち、調速制
御については、ヒートポンプ負荷に応じた設定回転数と
実際の機関回転数との偏差からコントロールユニット１
０のマイクロコンピュータ１が演算処理を行ない、ステ
ップモータ１２にパルス信号を出力口てスロットル弁２
２を操作する。また、空燃比制御については、あらかじ
めマイクロコンピュータ１のＲＯＭ ３に記憶された機
関回転数に応じたスロットル弁開度をしきい値として実
際のスロットル弁開度を判定し、その偏差に応じてミキ
サ一部２６における希薄燃焼とＥＧＲ弁１７の開弁によ
るＥＧＲとの組合せと、０２センサ１５からのフィード
バック信号によってガスインジェクタ１４を操作するこ
とによる理論空燃比燃焼と三元触媒１６の組合せとを切
シ換える。そして、実際のスロットル弁開度の検出は、
スロットル弁開度検出器で行なわずに、マイクロコンピ
ュータ１がステップモータ１２に与える駆動パル冬を自
らカウントし、その積算値を記憶する、いわゆるオープ
ンループ制御で行なうことも従来通シである。In the air-fuel ratio control mechanism for the heat pump-driving gas engine configured as described above, basic control of speed control and air-fuel ratio control is performed in the same manner as conventional methods. In other words, for speed regulating control, the control unit 1
The microcomputer 1 of 0 performs arithmetic processing and outputs a pulse signal to the step motor 12 and the throttle valve 2.
Operate 2. Regarding air-fuel ratio control, the actual throttle valve opening is determined using the throttle valve opening corresponding to the engine speed stored in the ROM 3 of the microcomputer 1 as a threshold, and the mixer is adjusted according to the deviation. The combination of lean combustion in the part 26 and EGR by opening the EGR valve 17, and the combination of stoichiometric air-fuel ratio combustion and three-way catalyst 16 by operating the gas injector 14 according to the feedback signal from the 02 sensor 15 are switched off. Change it. The actual throttle valve opening is detected by
It is also conventional to perform so-called open-loop control, in which the microcomputer 1 counts the drive pulses applied to the step motor 12 by itself and stores the integrated value, instead of using a throttle valve opening detector.
しかしながら、このままの制御では前述のようにサイク
リングが生じてしまうので、この発明では空燃比を切シ
換えた瞬間に、前記調速制御操作とは別に、スロットル
弁開度を開方向あるいは閉方向に大きく操作し、さらに
、その後は所定時間空燃比制御切換を禁止するようにし
ている。この手順を第２図のフローチャートを用いて詳
述する。However, if the control is carried out as it is, cycling will occur as described above, so in this invention, the moment the air-fuel ratio is switched, the throttle valve opening is changed in the opening direction or the closing direction, separately from the speed governor control operation. After that, air-fuel ratio control switching is prohibited for a predetermined period of time. This procedure will be explained in detail using the flowchart shown in FIG.
まず、空気過剰率を希薄燃焼方式から理論混合比にして
触媒方式とする（λ＝１，４→λ＝ｉ、ｏ）場合は、ス
テップ■で機関回転数を前記回転数センサ１１からの信
号によシ検出し、ステップ■でその回転数に応じた空燃
比切換スロットル開度θｎｌを下表よシ選択する。次に
、実際のスロ 、）ットル開度θｍを前述のよ
うに記憶したステップモータ１２の駆動パルス数の積算
値からステップ■で求め、ステップ■でこれを前述のス
ロットル開度θｎｌと比較判定する。θｍ、≦θｎｌの
場合（ＮＯ）は、空燃比切換を行なわずにステップ■に
戻るが、θｍ≧θｎ１の場合（ＹＥＳ）は、ステップ■
に移ってＥＧＲ弁１７を閉じ、続いてステップ■に移っ
て空燃比制御機構の作動をオンして理論空燃比制御を行
なう。そして、ステップ■て機関回転数に応じたスロッ
トル閉方向操作ステラフ数Ｓｄを画表よシ選択し、ステ
ップ■でステップモータ１２を前記ステップ数Ｓｄだけ
ダウンしてスロットル弁２２を閉じる。First, if the excess air ratio is changed from the lean burn method to the stoichiometric mixture ratio and the catalytic method is used (λ = 1, 4 → λ = i, o), in step In step (2), the air-fuel ratio switching throttle opening degree θnl is selected according to the rotation speed according to the table below. Next, the actual throttle opening θm is determined in step (2) from the accumulated value of the number of drive pulses of the step motor 12 stored as described above, and in step (2) this is compared with the aforementioned throttle opening θnl. . If θm, ≦θnl (NO), return to step ■ without performing air-fuel ratio switching, but if θm≧θn1 (YES), return to step ■
The program then moves to step (2) to close the EGR valve 17, and then to step (2), the air-fuel ratio control mechanism is turned on to perform stoichiometric air-fuel ratio control. Then, in step (2), a throttle closing direction operation step number Sd corresponding to the engine speed is selected from the screen, and in step (2), the step motor 12 is decreased by the step number Sd to close the throttle valve 22.
このようにして空燃比を切り換えた後は、この発明では
ステップ［相］に移って以後しばらくの聞辛燃比切換を
禁止する。これは空燃比切換後ステップ■でスロットル
弁２２を強制的に所定開度閉じ、回転数変動を最小限に
抑えても、空燃比切換後の数秒間は数十ｒｐｍ程度の小
さな回転変動は継続して生じておシ、サイクリングの要
因となるからであシ、このためにこの発明では空燃比切
換直後に回転数変動が整定するのに十分な一定時間の空
燃比切換禁止期間を設けてぃるのである。空燃比切換禁
止時間は例えば１０秒程度に設定すれば良い。After switching the air-fuel ratio in this manner, the present invention moves to step [phase] and prohibits switching of the air-fuel ratio for a while. This is because even if the throttle valve 22 is forcibly closed to a predetermined opening in step ② after the air-fuel ratio is switched, and the rotational speed fluctuation is minimized, small rotational fluctuations of about several tens of rpm will continue for several seconds after the air-fuel ratio is changed. Therefore, in this invention, an air-fuel ratio switching prohibition period is provided for a certain period of time that is sufficient for the rotational speed fluctuation to settle immediately after the air-fuel ratio switching. It is. The air-fuel ratio switching prohibition time may be set to about 10 seconds, for example.
以上説明したのはλ＝１４→λ＝１．０の空燃比切換で
あるが、λ＝１．ｏ→λ＝１．４への空燃比切換もこれ
と全く同様に行なう。前記手順と異なるのは、ステップ
０にて選択するスロットル開度が前表におけるθ。２で
あり、ステップ［相］における判定が今度はθ□≧θ。What has been explained above is the air-fuel ratio switching from λ=14 to λ=1.0, but when λ=1. The air-fuel ratio switching from o to λ=1.4 is performed in exactly the same manner. The difference from the above procedure is that the throttle opening degree selected in step 0 is θ in the previous table. 2, and the determination in step [phase] is θ□≧θ.
２０時（Ｎｏ）は空燃比切換を行なわず、θ□≦θ。２
０時（ＹＥＳ）は空燃比を切り換えて希薄燃焼方式にす
る点である。そして、ステップ［相］〜ステップ［相］
では前記手順とは全く逆に、ＥＧＲ弁１７を開き、空燃
比制御機構の作動をオフし、前表から機関回転数に応じ
た開方向操作ステップ数Ｓｕを選択してステップモータ
１２をそのステップ数だけアップしてスロットル弁２２
を開くのである。この操作の後、ステップ［相］におい
て一定時間の空燃比切換禁止時間を設けることは前記同
様に行なう。At 20:00 (No), air-fuel ratio switching is not performed and θ□≦θ. 2
At 0 o'clock (YES), the air-fuel ratio is switched to the lean burn mode. And step [phase] ~ step [phase]
Now, completely opposite to the above procedure, open the EGR valve 17, turn off the operation of the air-fuel ratio control mechanism, select the number of opening direction operation steps Su according to the engine speed from the table above, and move the step motor 12 to that step. Increase the number by the throttle valve 22
It opens. After this operation, a certain period of air-fuel ratio switching prohibition time is provided in step [phase] in the same manner as described above.
このステップ［相］における操作が終了すると、再びス
テップ■に戻ってλ＝１．ｏ→λ二１．４の空燃比の切
り換えが行なわれる。When the operation in this step [phase] is completed, the process returns to step (2) and λ=1. The air-fuel ratio is switched from o to λ21.4.
従って、この発明のヒートポンプ駆動用ガス機関の空燃
比制御機構では、空燃比切換時にサイクリングを生じさ
せることなく、空燃比の切り換えを行なうことができる
。Therefore, in the air-fuel ratio control mechanism for a heat pump-driving gas engine of the present invention, the air-fuel ratio can be switched without causing cycling when switching the air-fuel ratio.
以上説明したようにこの発明では、λ＝１．４→λ＝１
．０の空燃比切換時は、スロットル弁を強制的に所定角
度閉じ、λ＝１．０→λ＝１．４の空燃比切換時は、ス
ロットル弁を強制的に所定角度開くようにし、そして、
強制的に開閉するスロットル弁を操作するステップモー
タ１２へ入力するパルス信号のステップ数は、試験によ
って回転数変動が最小となる最適値を求め、これを機関
回転数の関数として数表の形でマイクロコンピュータの
ＲＯＭに記憶させておき、さらに空燃比切換後は回転数
変動が治まるのに十分な時間だけ空燃比切換を禁止した
ことにより、空燃比切換時にサイクリングの発生が抑え
られ、機関にハンチングが生じないという効果がある。As explained above, in this invention, λ=1.4→λ=1
．． When switching the air-fuel ratio from λ=1.0 to λ=1.4, the throttle valve is forcibly closed by a predetermined angle, and when switching from λ=1.0 to λ=1.4, the throttle valve is forcibly opened by a predetermined angle.
As for the number of steps of the pulse signal input to the step motor 12 that operates the throttle valve that is forcibly opened and closed, the optimum value that minimizes the rotational speed fluctuation is determined through tests, and this is expressed in the form of a numerical table as a function of the engine rotational speed. This is stored in the microcomputer's ROM, and by inhibiting air-fuel ratio switching for a sufficient period of time for rotational speed fluctuations to subside after air-fuel ratio switching, the occurrence of cycling is suppressed during air-fuel ratio switching, and hunting is prevented in the engine. This has the effect that it does not occur.
まだ、前述のようにこの発明ではサイクリングが生じな
いので、ヒートポンプ駆動用ガス機関用の調速機構とし
て、構造簡単、低コスト。However, as mentioned above, since cycling does not occur in this invention, the structure is simple and low cost as a speed regulating mechanism for a gas engine for driving a heat pump.
高信頼性の電子ガバナを適用できるという利点がある。This has the advantage that a highly reliable electronic governor can be applied.
第１図はこの発明のヒートポンプ駆動用ガス機関の空燃
比制御機構の一実施例の構成説明図、第２図は第１図の
空燃比制御機構の動作手順を示す流れ図である。
１・・・マイクロコンピュータ、２・・・ＣＰＵ、３・
・・ＲＯＭ、４・・・ＲＡＭ、５・・・■ンポート、６
・・・カウンタ、７・・・性変換器、８・・・増幅器、
１０・・・コントロールユニット、１１・・・回転数セ
ンサ、１２・・・ステップモータ、１４・・・ガスイン
ジェクタ、１５・・・０２センザ、１６・・・三元触媒
、１７・・・ＥＧＲ弁、２０・・・ガス機関、２２・・
・スロットル弁、２６・・・ガス導入管、２５・・・フ
ライホイール、２６・・・ミキザ一部。FIG. 1 is a configuration explanatory diagram of an embodiment of an air-fuel ratio control mechanism for a heat pump-driving gas engine of the present invention, and FIG. 2 is a flowchart showing the operating procedure of the air-fuel ratio control mechanism of FIG. 1. 1...Microcomputer, 2...CPU, 3.
...ROM, 4...RAM, 5... ■port, 6
... Counter, 7... Sex converter, 8... Amplifier,
10... Control unit, 11... Rotation speed sensor, 12... Step motor, 14... Gas injector, 15... 02 sensor, 16... Three-way catalyst, 17... EGR valve , 20... gas engine, 22...
- Throttle valve, 26... Gas introduction pipe, 25... Flywheel, 26... Part of mixer.
Claims (1)
することによシ、ヒートポンプ負荷に応じた機関回転数
に制御する方式の調速機構と、インジェクタにより所定
量の燃料を追加する方式の空燃比制御機構とを有し、機
関回転数に応じて決定されるスロットル弁開度をしきい
値として実際のスロットル弁開度を判定し、その結果に
より前記空燃比制御機構の作動をオン。 オフすることにより空燃比切換を行なうヒートポンプ駆
動ガス機関において、空燃比減少方向への切換時は、前
記空燃比制御機構をオンすると同時にスロットル弁を所
定量閉方向に操作し、空燃比増加方向への切換時は、前
記空燃比制御機構をオフすると同時にスロットル弁を所
定量開方向に操作し、さらに、空燃比切換後の所定時間
内は、空燃比切換禁止期間として前記空燃比制御機構を
そのままの状態に保持するように構成してなるヒートポ
ンプ駆動用ガス機関の空燃比制御機構。[Scope of Claims] A speed regulating mechanism that controls the engine speed according to the heat pump load by operating a throttle valve to f [opening degree using a step motor, and a predetermined amount of fuel using an injector. The air-fuel ratio control mechanism has an air-fuel ratio control mechanism that adds Turn on the operation. In a heat pump-driven gas engine that switches the air-fuel ratio by turning off the air-fuel ratio, when switching to a decreasing air-fuel ratio, turn on the air-fuel ratio control mechanism and at the same time operate the throttle valve by a predetermined amount in the closing direction to increase the air-fuel ratio. At the time of switching, the air-fuel ratio control mechanism is turned off and the throttle valve is operated in the opening direction by a predetermined amount at the same time.Furthermore, the air-fuel ratio control mechanism is left unchanged for a predetermined period of time after the air-fuel ratio switching as an air-fuel ratio switching prohibition period. An air-fuel ratio control mechanism for a gas engine for driving a heat pump, which is configured to maintain the air-fuel ratio in this state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58071510A JPS59200049A (en) | 1983-04-25 | 1983-04-25 | Air-fuel ratio control mechanism for heat pump driving gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58071510A JPS59200049A (en) | 1983-04-25 | 1983-04-25 | Air-fuel ratio control mechanism for heat pump driving gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59200049A true JPS59200049A (en) | 1984-11-13 |
Family
ID=13462763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58071510A Pending JPS59200049A (en) | 1983-04-25 | 1983-04-25 | Air-fuel ratio control mechanism for heat pump driving gas engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59200049A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61187545A (en) * | 1985-02-15 | 1986-08-21 | Mitsubishi Motors Corp | Air-fuel ratio controller for car engine |
| JPH0678676U (en) * | 1992-05-14 | 1994-11-04 | 西武機材株式会社 | Water control valve housing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59136539A (en) * | 1983-01-24 | 1984-08-06 | Toyota Motor Corp | Method of controlling air-fuel ratio of internal-combustion engine |
-
1983
- 1983-04-25 JP JP58071510A patent/JPS59200049A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59136539A (en) * | 1983-01-24 | 1984-08-06 | Toyota Motor Corp | Method of controlling air-fuel ratio of internal-combustion engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61187545A (en) * | 1985-02-15 | 1986-08-21 | Mitsubishi Motors Corp | Air-fuel ratio controller for car engine |
| JPH0678676U (en) * | 1992-05-14 | 1994-11-04 | 西武機材株式会社 | Water control valve housing |
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