JPS5815736A - Method of avoiding unbalance state of exhaust gas of internal combustion engine - Google Patents

Method of avoiding unbalance state of exhaust gas of internal combustion engine

Info

Publication number
JPS5815736A
JPS5815736A JP11875682A JP11875682A JPS5815736A JP S5815736 A JPS5815736 A JP S5815736A JP 11875682 A JP11875682 A JP 11875682A JP 11875682 A JP11875682 A JP 11875682A JP S5815736 A JPS5815736 A JP S5815736A
Authority
JP
Japan
Prior art keywords
exhaust gas
internal combustion
combustion engine
value
avoiding
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
Application number
JP11875682A
Other languages
Japanese (ja)
Inventor
デイ−タ−・レ−マン
ハラルト・レ−ベル
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of JPS5815736A publication Critical patent/JPS5815736A/en
Pending legal-status Critical Current

Links

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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1408—Dithering techniques
    • 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
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/281—Interface circuits between sensors and control unit
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/286—Interface circuits comprising means for signal processing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/021—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an ionic current sensor

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Testing Of Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 技術水準 本発明は、排気弁の後の排気ガス管に、測定電圧が印加
されている限界電流ゾンデを設けた内燃機関の排気ガス
の非平衡状態を避ける方法に関する。非平衡状態は、例
えば半導体センサを用いて酸素含有ガス中の一酸化炭素
のような不燃焼分を測定することによって検出でき、適
当に不燃焼分が少なくなるように制御して回避できる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for avoiding imbalances in the exhaust gas of an internal combustion engine, in which the exhaust gas pipe after the exhaust valve is provided with a limiting current probe to which a measuring voltage is applied. The non-equilibrium state can be detected by measuring unburned components such as carbon monoxide in the oxygen-containing gas using a semiconductor sensor, for example, and can be avoided by controlling the unburned components to be appropriately reduced.

しかし、このために、不燃焼分のうちできる限シ一つの
不燃焼分にだけ応動する特殊なセンサを開発する必要が
ある。However, for this purpose, it is necessary to develop a special sensor that responds only to as much as possible of the unburned fraction.

発明の効果 それに対して、本発明の方法は、燃料−空気供給量を最
適にするために、公知の電子素子および回路ならびに限
界電流シンｒを用いて★施できるという利点を有してい
る。Advantages of the Invention The method of the invention, on the other hand, has the advantage that it can be implemented using known electronic components and circuits and limiting current ratios in order to optimize the fuel-air supply.

エンジンが作動している際、排気弁を開いた後、エンジ
ンの排気装置においてこの排気弁の後に取付けられてい
る限界電流ゾンデに、燃焼したシリンダのガス混合気の
圧縮濃度波が達する。その際、限界電流範囲で作動する
ゾンデは、酸素含有量に比例する限界電流を指示する。When the engine is running, after opening the exhaust valve, a compressed concentration wave of the gas mixture of the burned cylinder reaches a limiting current probe which is installed after the exhaust valve in the exhaust system of the engine. The sonde operating in the limiting current range then commands a limiting current that is proportional to the oxygen content.

作動限界値およびλ＝１の点の近傍の作動状態で生じる
不燃焼分が、この装置における限界電流ゾンデによって
、電極への拡散および電気化学変換と同じ速度で平衡調
整されない。即ち、平衡調整の速度は、電極への混合気
の拡散の速度および電気化学変換の速度より小さい。そ
のような作動状態は、装置において最適なλ値より小さ
い所で生じる様なＣ０−１ＯＨ−およびＣ−濃度の上昇
と同じである。そのような作動状態では、流れる電流は
多少不安定である。より正確な解明によって、そのよう
な作動状態は、シリンダ内の燃焼過程中、周期的に現わ
れる圧力変動によって生じる交流に含まれている電流波
高値において現われることがわかる。その際、この交流
電流成分はエンジンの回転数に同期している。それ故、
その種の限界電流ゾンデの交流信号を分析することによ
って、最高なλ値より小さい所で動作している、内燃機
関、例えばディーゼルエンジンの不都合な作動状態を示
す信号が得られる。この交流信号は本発明によればλ値
を最適に調整するために使われる。即ち、交流信号の最
小の振幅はλ値が最小のときに保持される。The operating limits and the unburned fractions that occur at operating conditions near the point λ=1 are not balanced by the limiting current probe in this device at the same rate as the diffusion to the electrodes and the electrochemical conversion. That is, the rate of equilibration is less than the rate of diffusion of the mixture to the electrodes and the rate of electrochemical conversion. Such operating conditions are equivalent to an increase in C0-1OH- and C- concentrations as occurs below the optimum λ value in the device. Under such operating conditions, the current flowing is somewhat unstable. A more precise elucidation reveals that such an operating state appears at the peak values of the current contained in the alternating current caused by pressure fluctuations that appear periodically during the combustion process in the cylinder. At this time, this alternating current component is synchronized with the engine speed. Therefore,
By analyzing the alternating current signals of such limiting current probes, signals are obtained which indicate unfavorable operating conditions of an internal combustion engine, for example a diesel engine, operating below the maximum λ value. This alternating current signal is used according to the invention to optimally adjust the λ value. That is, the minimum amplitude of the AC signal is maintained when the λ value is the minimum.

この方法は特に排気ガスを帰還しないディーゼルエンジ
ンに有効であるが、排気ガス帰還形ディーゼルエンジン
にも使うことができる。と言うのは、排気ガス帰還形デ
ィーゼルエンジンの場合でも排気ガスの帰還量が増加し
た際に前述の効果を用いて不完全燃焼の開始を検出する
ことができる。その結果、排気ガスの帰還量を最適に調
整できる。This method is particularly effective for diesel engines that do not recirculate exhaust gas, but can also be used for exhaust gas recirculation type diesel engines. This is because even in the case of an exhaust gas feedback type diesel engine, the start of incomplete combustion can be detected using the above-mentioned effect when the amount of exhaust gas feedback increases. As a result, the amount of exhaust gas returned can be optimally adjusted.

実施例の説明 ディーゼルエンジンにおいて、排気弁の後の排気ガス管
には、例えばドイツ特許出願公開公報第２７１１８８０
号から公知のような、測定電圧が印加された限界電流ゾ
ンデが取付けられている。電流は本発明に属しない調整
装置に供給され、同時に調整装置は電流波高値の振幅と
その頻度とに相応して、電流値をλ値に変換する。調整
装置は、検出された値に依存して、交流電流の波高値の
振幅が、λ値が同時に最小の場合、最小に保持されるよ
うに燃料−空気供給量を調整するように構成されている
。DESCRIPTION OF THE EMBODIMENTS In a diesel engine, the exhaust gas pipe after the exhaust valve has a
A limiting current probe, as known from No. 1, is installed, to which a measuring voltage is applied. The current is supplied to a regulating device which does not belong to the invention, and at the same time converts the current value into a λ value depending on the amplitude of the current peak value and its frequency. The adjustment device is configured to adjust the fuel-air supply amount in dependence on the detected value such that the amplitude of the peak value of the alternating current is kept at a minimum if the λ value is simultaneously minimum. There is.

得られた信号は個々のシリンダの燃焼過程も合致して調
整できる程高速である。The signal obtained is fast enough that the combustion process of the individual cylinders can also be adjusted accordingly.

Claims (1)

【特許請求の範囲】[Claims] 排気弁の後の排気ガス管に、測定電圧が印加されている
限界電流ゾンデを設けた、内燃機関の排気ガスの非平衡
状態を避ける方法において、不完全燃焼の場合に生じる
交流信号の波高値を、λ値を最適に調整するために調整
装置に供給し、前記調整装置は、交流波高値の振幅がλ
値が最小の際に最小に保持されるように燃料−空気供給
量を調整するようにしたことを特徴とする内燃機関の排
気ガスの非平衡状態を避ける方法。The peak value of an alternating current signal that occurs in the case of incomplete combustion in a method of avoiding an unbalanced state of the exhaust gas of an internal combustion engine, in which a limiting current sonde to which a measurement voltage is applied is installed in the exhaust gas pipe after the exhaust valve. is supplied to an adjustment device in order to optimally adjust the λ value, and the adjustment device is configured so that the amplitude of the AC peak value is λ
1. A method for avoiding an imbalanced state of exhaust gas in an internal combustion engine, characterized in that the fuel-air supply amount is adjusted so that when the value is at a minimum, it is maintained at a minimum.
JP11875682A 1981-07-09 1982-07-09 Method of avoiding unbalance state of exhaust gas of internal combustion engine Pending JPS5815736A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE31270387 1981-07-09
DE19813127038 DE3127038A1 (en) 1981-07-09 1981-07-09 Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines

Publications (1)

Publication Number Publication Date
JPS5815736A true JPS5815736A (en) 1983-01-29

Family

ID=6136451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11875682A Pending JPS5815736A (en) 1981-07-09 1982-07-09 Method of avoiding unbalance state of exhaust gas of internal combustion engine

Country Status (2)

Country Link
JP (1) JPS5815736A (en)
DE (1) DE3127038A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04223269A (en) * 1990-03-22 1992-08-13 Electronite Internatl Nv Sampling device for molten metal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3705972A1 (en) * 1987-02-25 1988-09-08 Audi Ag CONTROL DEVICE FOR A DIESEL INTERNAL COMBUSTION ENGINE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711880C2 (en) * 1977-03-18 1985-01-17 Robert Bosch Gmbh, 7000 Stuttgart Polarographic probe for measuring oxygen concentration and process for its manufacture
DE2946440A1 (en) * 1979-11-17 1981-05-27 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR OBTAINING A CONTROL SIZE FOR REGULATING THE FUEL-AIR RATIO OF INTERNAL COMBUSTION ENGINES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04223269A (en) * 1990-03-22 1992-08-13 Electronite Internatl Nv Sampling device for molten metal

Also Published As

Publication number Publication date
DE3127038A1 (en) 1983-01-20
DE3127038C2 (en) 1990-02-01

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