JPS648184B2 - - Google Patents
Info
- Publication number
- JPS648184B2 JPS648184B2 JP3869281A JP3869281A JPS648184B2 JP S648184 B2 JPS648184 B2 JP S648184B2 JP 3869281 A JP3869281 A JP 3869281A JP 3869281 A JP3869281 A JP 3869281A JP S648184 B2 JPS648184 B2 JP S648184B2
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- fuel ratio
- air
- control
- 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.)
- Expired
Links
- 239000000446 fuel Substances 0.000 claims description 36
- 241000234435 Lilium Species 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000004913 activation Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- WRRSFOZOETZUPG-FFHNEAJVSA-N (4r,4ar,7s,7ar,12bs)-9-methoxy-3-methyl-2,4,4a,7,7a,13-hexahydro-1h-4,12-methanobenzofuro[3,2-e]isoquinoline-7-ol;hydrate Chemical compound O.C([C@H]1[C@H](N(CC[C@@]112)C)C3)=C[C@H](O)[C@@H]1OC1=C2C3=CC=C1OC WRRSFOZOETZUPG-FFHNEAJVSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- 238000010792 warming 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
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
- F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
- F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【発明の詳細な説明】
この発明は、自動車等のエンジンの気化器制御
装置に係り、例えば、気化器のベンチユリの上部
に設けたチヨーク弁をエンジン始動時は全閉とし
始動後はエンジンの暖機状態に応じてチヨーク弁
を開くように制御するチヨーク機構と、排気ガス
の酸素濃度を検出しているO2センサの検出信号
を入力に受けてエンジンに供給する混合気の空燃
比を演算して出力する空燃比制御回路とを併せ持
つエンジンにおける気化器制御装置に関するもの
で、空燃比の急変をなくし運転性と排気性能の良
好化を図つたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carburetor control device for an engine such as an automobile. The air-fuel ratio of the air-fuel mixture supplied to the engine is calculated by receiving the detection signal from the chiyok mechanism, which controls the chiyoke valve to open according to the machine condition, and the O2 sensor, which detects the oxygen concentration of the exhaust gas. This relates to a carburetor control device for an engine that also has an air-fuel ratio control circuit that outputs air-fuel ratio, and is intended to improve driveability and exhaust performance by eliminating sudden changes in the air-fuel ratio.
空燃比の帰還制御に関する従来技術としては特
開昭55−160140等がある。以下、従来例として、
公知のチヨーク弁制御機構を内蔵する気化器を備
えたエンジンの場合を例にとつて、従来技術を、
第１図，第２図によつて説明する。 Prior art related to air-fuel ratio feedback control includes Japanese Patent Application Laid-Open No. 160140/1984. Below, as a conventional example,
Taking the case of an engine equipped with a carburetor with a built-in known chiyoke valve control mechanism as an example, the conventional technology is
This will be explained with reference to FIGS. 1 and 2.
第１図において、１０はエンジン、２０は気化
器、３０は空燃比制御回路である。気化器２０
は、詳細拡大図に示すように、ベンチユリ２１の
上部に設けたチヨーク弁２２の開度を、ヒータと
バイメタルを内蔵するチヨーク・オープナー２３
によつて、エンジンの始動時は温度に応じて閉じ
始動後は暖機状態に応じて開くように制御する公
知のチヨーク弁制御機構を備えている。一方、空
燃比制御回路３０は、エンジンの排気ガス３１中
の酸素濃度を検出しているO2センサ３２からの
検出信号を入力に受けてエンジン１０に供給する
混合気の空燃比Ａ／Ｆを演算し、演算結果の空燃
比信号３３をＡ／Ｆ制御用サーボ弁３４に送つて
いる。Ａ／Ｆ制御用サーボ弁３４は入力されてく
る空燃比信号３３に応じて気化器２０への燃料量
を制御するようにサーボ弁を開閉駆動する。な
お、２４はスロツトル弁である。 In FIG. 1, 10 is an engine, 20 is a carburetor, and 30 is an air-fuel ratio control circuit. vaporizer 20
As shown in the detailed enlarged view, the opening of the opening valve 22 provided at the top of the bench lily 21 is controlled by the opening of the opening valve 22 provided on the upper part of the bench lily 21 using the opening of the opening valve 22, which has a built-in heater and bimetal.
The engine is equipped with a known valve control mechanism that closes the engine when starting the engine depending on the temperature and opens the engine after starting the engine depending on the warm-up condition. On the other hand, the air-fuel ratio control circuit 30 receives as input a detection signal from an O 2 sensor 32 that detects the oxygen concentration in the exhaust gas 31 of the engine, and controls the air-fuel ratio A/F of the mixture to be supplied to the engine 10. The air-fuel ratio signal 33 resulting from the calculation is sent to the A/F control servo valve 34. The A/F control servo valve 34 opens and closes the servo valve to control the amount of fuel to the carburetor 20 in accordance with the input air-fuel ratio signal 33. Note that 24 is a throttle valve.
従来は例えば上記した如くチヨーク機構と空燃
比制御回路とは、別個に作動していたので、次の
ように不都合を生じることがあつた。即ち、チヨ
ーク機構がまだ動作していてチヨーク弁の開度が
小さい時に、理論空燃比λを１にするように空燃
比を制御するλ制御が始まると、チヨーク機構の
ために空燃比はRICHとなつていることから、λ
制御は空燃比をフルにLEANにするように動作
する。これを第２図により、さらに具体的に説明
する。第２図ａは空燃比Ａ／Ｆの時間的変化を示
す曲線図で、曲線１は制御用サーボ弁３４を全閉
即ちＡ／ＦをRICHとした時、曲線２は制御用サ
ーボ弁３４を全開即ちＡ／ＦをLEANとした時
の空燃比の変化を示し、運転条件一定で暖機して
ゆく過程での空燃比Ａ／Ｆの特性を示している。
曲線３はチヨーク機構によるチヨーク弁制御と無
関係に、O2センサ３２の活性化を検出した時点
にλ制御を開始する場合の空燃比Ａ／Ｆの変化状
態を示している。Ａ点でO2センサ３２が活性化
したことを検知し、（これはO2センサ３２の出力
値があるスライスレベルに達したことに相当す
る）、この検知以後は第２図ｂのフロー図に示す
ように空燃比Ａ／Ｆを少しLEANにするように
制御することにより、Ａ点経過後は傾斜が急にな
り、Ｂ点で曲線２の線に達してλ＝１のＣ点まで
は曲線２上を進み、Ｃ点以後はλ制御の効果によ
りλ＝１の線に沿つて上下に微少変動しながら経
過する。 In the past, for example, as described above, the choke mechanism and the air-fuel ratio control circuit operated separately, which sometimes caused the following inconveniences. In other words, when the Chi York mechanism is still operating and the opening degree of the Chi York valve is small, when λ control, which controls the air-fuel ratio to bring the stoichiometric air-fuel ratio λ to 1, begins, the air fuel ratio becomes RICH due to the Chi York mechanism. Since it is familiar, λ
The control operates to bring the air-fuel ratio to full LEAN. This will be explained in more detail with reference to FIG. FIG. 2a is a curve diagram showing temporal changes in the air-fuel ratio A/F. Curve 1 is when the control servo valve 34 is fully closed, that is, A/F is RICH, and curve 2 is when the control servo valve 34 is fully closed, that is, A/F is RICH. It shows the change in the air-fuel ratio when the engine is fully open, that is, the A/F is set to LEAN, and shows the characteristics of the air-fuel ratio A/F during the process of warming up under constant operating conditions.
Curve 3 shows the state of change in the air-fuel ratio A/F when λ control is started at the time when activation of the O 2 sensor 32 is detected, regardless of the check valve control by the check mechanism. It is detected that the O 2 sensor 32 has been activated at point A (this corresponds to the output value of the O 2 sensor 32 reaching a certain slice level), and after this detection, the flowchart shown in Fig. 2b is executed. By controlling the air-fuel ratio A/F to be slightly LEAN as shown in the figure, the slope becomes steeper after point A, reaches curve 2 at point B, and reaches point C at λ=1. It travels on curve 2, and after point C, it passes while slightly fluctuating up and down along the line of λ=1 due to the effect of λ control.
このように、エンジン暖機過程における従来の
空燃比制御回路によるλ制御は例えばチヨーク機
構におけるようにチヨーク弁制御とは、即ちエン
ジンの暖機状態に応じた制御とは無関係に行なわ
れていたことから、λ制御の開始前と始動後とで
空燃比Ａ／Ｆが大きく変わつてしまい、バツクフ
アイヤや運転性不良の起因となつていた。 In this way, the λ control by the conventional air-fuel ratio control circuit during the engine warm-up process was performed independently of the chi-yok valve control, such as in the chi-yok mechanism, that is, the control according to the warm-up state of the engine. As a result, the air-fuel ratio A/F changes greatly between before and after the start of the lambda control, causing backfire and poor drivability.
本発明は、上記した問題点に着目してなされた
もので、暖機経過の空燃比Ａ／Ｆの急変をなく
し、運転性を良好化することのできる気化器制御
装置を提供することを目的とするものである。 The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a carburetor control device that can eliminate sudden changes in the air-fuel ratio A/F during warm-up and improve driveability. That is.
本発明の特徴は、ベンチユリ上部に設けたチヨ
ーク弁をエンジンの始動時は温度に応じて閉じ始
動後は暖機状態に応じて開くように制御するチヨ
ーク弁制御機構を備えた気化器において、排気ガ
ス中の酸素濃度を検出するO2センサが活性化し
たことを検出する手段と、該手段によりO2セン
サが活性化したことを検出した場合チヨーク弁の
開く速度をO2センサが活性化する前の速度より
も大きくすると同時にO2センサの信号に基づく
空燃比のフイードバツク制御を開始する手段とを
備えた気化器制御装置とするにある。 A feature of the present invention is that in a carburetor equipped with a check valve control mechanism that controls a check valve provided at the top of the bench lily to close according to the temperature when starting the engine and open according to the warm-up state after starting, means for detecting activation of an O 2 sensor that detects oxygen concentration in gas; and when the means detects activation of the O 2 sensor, the O 2 sensor activates the opening speed of the chioke valve. The present invention provides a carburetor control device comprising means for starting air-fuel ratio feedback control based on a signal from an O 2 sensor at the same time as increasing the speed from the previous speed.
以下図面に示す実施例により本発明を説明す
る。 The present invention will be explained below with reference to embodiments shown in the drawings.
第１図において、２２はチヨーク弁であり、上
記説明した従来のチヨーク弁制御機構、すなわち
エンジンの始動時は温度に応じて閉じ、始動後は
暖機状態に応じて開くように制御するチヨーク弁
制御機構により開閉される。２５は該チヨーク弁
２２の開度を検出するチヨーク弁開度センサで、
検出結果のチヨーク弁開度信号２６は空燃比制御
回路３０に入力される。１１はエンジン１０の冷
却水温を検出する水温センサで、その検出結果の
温度信号１２も空燃比制御回路３０に入力され
る。 In FIG. 1, reference numeral 22 denotes a check valve, which is controlled by the conventional check valve control mechanism described above, that is, a check valve that is controlled to close according to the temperature when starting the engine and open according to the warm-up state after starting the engine. It is opened and closed by a control mechanism. 25 is a check valve opening sensor that detects the opening degree of the check valve 22;
The detection result, ie, the chiyoke valve opening signal 26, is input to the air-fuel ratio control circuit 30. Reference numeral 11 denotes a water temperature sensor that detects the cooling water temperature of the engine 10, and a temperature signal 12 as a result of the detection is also input to the air-fuel ratio control circuit 30.
第３図は本発明の実施例を示す図で、これはサ
ーボ弁３４を全開で暖機し、O2センサ３２が活
性化したことを検知したＥ点でλ制御を開始し、
それ以後はチヨーク弁２２を開く速度を速める場
合であり、第３図ａはその場合の空燃比Ａ／Ｆの
変化曲線３を、ｂはフロー図を示す。 FIG. 3 is a diagram showing an embodiment of the present invention, in which the servo valve 34 is fully opened to warm up, and λ control is started at point E when activation of the O 2 sensor 32 is detected.
After that, the opening speed of the check valve 22 is increased, and FIG. 3a shows a change curve 3 of the air-fuel ratio A/F in that case, and FIG. 3b shows a flow chart.
以上説明したように、本発明によれば、エンジ
ンの暖機状態とλ制御とに関連を持たせる構成と
したことにより、暖機過程の空燃比Ａ／Ｆが安定
し、Ａ／Ｆの急変がないことから運転性が良好と
なり、空燃比のオーバRICHがないことから排気
性能の悪化や点火プラグのくすぶり等がなくなる
等の効果が得られる。 As explained above, according to the present invention, by configuring the warm-up state of the engine and the λ control to be related, the air-fuel ratio A/F during the warm-up process is stabilized, and sudden changes in the A/F Since there is no excess RICH in the air-fuel ratio, the drivability is improved, and since there is no air-fuel ratio over-RICH, effects such as deterioration of exhaust performance and smoldering of spark plugs are eliminated.
第１図は気化器の概要説明図、第２図は空燃比
制御だけの場合の空燃比変化とそのλ制御のフロ
ー図、第３図は本発明の実施例を示す図でａは空
燃比変化曲線を示す図、ｂはそのλ制御のフロー
図である。
符号の説明、１０…エンジン、１１…水温セン
サ、２０…気化器、２１…ベンチユリ、２２…チ
ヨーク弁、２３…チヨーク・オープナー、２４…
スロツトル弁、２５…チヨーク弁開度センサ、３
０…空燃比制御回路、３１…排気ガス、３２…
O2センサ、３４…Ａ／Ｆ制御用サーボ弁。
Fig. 1 is a schematic explanatory diagram of a carburetor, Fig. 2 is a flow chart of air-fuel ratio changes and its λ control when only air-fuel ratio control is performed, and Fig. 3 is a diagram showing an embodiment of the present invention. A diagram showing the change curve, b is a flow diagram of the λ control. Explanation of symbols, 10... Engine, 11... Water temperature sensor, 20... Carburetor, 21... Bench lily, 22... Chiyoke valve, 23... Chiyoke opener, 24...
Throttle valve, 25... York valve opening sensor, 3
0...Air-fuel ratio control circuit, 31...Exhaust gas, 32...
O 2 sensor, 34...Servo valve for A/F control.
Claims (1)
ンの始動時は温度に応じて閉じ始動後は暖機状態
に応じて開くように制御するチヨーク弁制御機構
を備えた気化器において、排気ガス中の配素濃度
を検出するO2センサの出力が所定値に達したこ
とを検出して該O2センサが活性化したことを検
出する手段と、該手段によりO2センサが活性化
したことを検出した場合チヨーク弁の開く速度を
O2センサが活性化する前の速度よりも大きくす
ると同時にO2センサの信号に基づく空燃比のフ
イードバツク制御を始動する手段とを備えたこと
を特徴とする気化器制御装置。1. In a carburetor equipped with a chiyoke valve control mechanism that controls the chiyoke valve installed at the top of the bench lily to close according to the temperature when the engine is started and open according to the warm-up state after starting, it is possible to control the elements in the exhaust gas. means for detecting that the output of an O 2 sensor for detecting concentration has reached a predetermined value and that the O 2 sensor has been activated; and a case where the means detects that the O 2 sensor has been activated. The opening speed of the check valve
1. A carburetor control device comprising means for increasing the speed to a speed higher than that before the O 2 sensor was activated and at the same time starting air-fuel ratio feedback control based on a signal from the O 2 sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3869281A JPS57153950A (en) | 1981-03-19 | 1981-03-19 | Control device of carburetor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3869281A JPS57153950A (en) | 1981-03-19 | 1981-03-19 | Control device of carburetor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57153950A JPS57153950A (en) | 1982-09-22 |
| JPS648184B2 true JPS648184B2 (en) | 1989-02-13 |
Family
ID=12532346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3869281A Granted JPS57153950A (en) | 1981-03-19 | 1981-03-19 | Control device of carburetor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57153950A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0615848B2 (en) * | 1984-02-01 | 1994-03-02 | スズキ株式会社 | Air-fuel ratio controller for internal combustion engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5144734A (en) * | 1974-10-16 | 1976-04-16 | Hitachi Ltd | KUNENHIJIDOSEIGYO SOCHI |
| JPS54167234U (en) * | 1978-05-17 | 1979-11-24 | ||
| JPS5572639A (en) * | 1978-11-27 | 1980-05-31 | Automob Antipollut & Saf Res Center | Air-fuel ratio control device |
-
1981
- 1981-03-19 JP JP3869281A patent/JPS57153950A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57153950A (en) | 1982-09-22 |
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