JPS6125308B2 - - Google Patents
Info
- Publication number
- JPS6125308B2 JPS6125308B2 JP55034023A JP3402380A JPS6125308B2 JP S6125308 B2 JPS6125308 B2 JP S6125308B2 JP 55034023 A JP55034023 A JP 55034023A JP 3402380 A JP3402380 A JP 3402380A JP S6125308 B2 JPS6125308 B2 JP S6125308B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- air
- oxygen
- sensor
- fuel
- 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
- 239000001301 oxygen Substances 0.000 claims description 40
- 229910052760 oxygen Inorganic materials 0.000 claims description 40
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 39
- 239000000446 fuel Substances 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 230000000875 corresponding effect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
Description
【発明の詳細な説明】
本発明は内燃機関の空燃比制御装置に用いるヒ
ータ付酸素センサ（ヒータ付基準酸素極内蔵型酸
素センサ）のヒータ電流制御回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heater current control circuit for a heater-equipped oxygen sensor (heater-equipped reference oxygen electrode built-in oxygen sensor) used in an air-fuel ratio control device for an internal combustion engine.
排気ガス中の酸素濃度を検出し、その結果に基
づいて燃料調量装置（気化器、燃料噴射装置等）
をフイードバツク制御することにより、機関に供
給する混合気の空燃比を所定の目標値に一致させ
るように制御する空燃比制御装置が実用化されて
いる。 Detects the oxygen concentration in the exhaust gas and uses the fuel metering device (carburizer, fuel injection device, etc.) based on the result.
An air-fuel ratio control device has been put into practical use that controls the air-fuel ratio of the air-fuel mixture supplied to the engine to match a predetermined target value by performing feedback control on the air-fuel ratio.
上記のごとき空燃比制御装置において、排気ガ
ス中の酸素濃度を検出する酸素センサは、一般
に、動作温度に制限があり、低温（数百℃以下例
えば300℃以下）では正常に動作しなくなる。そ
のため低温始動後の暖機時やアイドリング状態が
長時間継続して排気ガス温度が低下した場合等に
おいては、正常なフイードバツク制御を行なうこ
とが困難になるという問題があつた。 In the air-fuel ratio control device as described above, the oxygen sensor that detects the oxygen concentration in exhaust gas generally has a limited operating temperature, and does not operate properly at low temperatures (below several hundred degrees Celsius, for example, below 300 degrees Celsius). Therefore, there has been a problem in that it is difficult to perform normal feedback control during warm-up after a low-temperature start or when the exhaust gas temperature drops due to continued idling for a long time.
上記の問題を解決するため、酸素センサを加熱
するヒータを備えたヒータ付基準酸素極内蔵型酸
素センサ（ヒータ付膜構造センサとも呼ぶ、詳細
後述）が開発された。 In order to solve the above problem, an oxygen sensor with a built-in reference oxygen electrode with a heater (also referred to as a membrane structure sensor with a heater; details will be described later) was developed, which is equipped with a heater that heats the oxygen sensor.
上記のヒータ付基準酸素極内蔵極酸素センサを
用い、酸素センサが正常動作できないような低温
時には、ヒータに通電して酸素センサを加熱して
やれば、従来よりも広い温度範囲で正常なフイー
ドバツク制御を行なうことが可能となる。 When using the polar oxygen sensor with a built-in reference oxygen electrode with a heater mentioned above, and when the temperature is too low for the oxygen sensor to operate normally, by energizing the heater and heating the oxygen sensor, normal feedback control can be performed over a wider temperature range than before. becomes possible.
しかし従来の装置においては、機関が高負荷
（排気温度が高い）の場合にはヒータへの通電を
遮断し、その他の場合には常にヒータへ通電する
という２状態のみの単純な制御を行なつていたの
で次のごとき問題があつた。 However, conventional devices perform simple control with only two states: power is cut off to the heater when the engine is under high load (high exhaust temperature), and power is always turned on to the heater in other cases. As a result, the following problem arose.
すなわち、機関の運転条件が高負荷域から低負
荷域に入つた場合、急にヒータに最大電流が通電
されるため、バツテリ電圧が瞬間的に変動し、そ
の変動分が酸素センサの出力に混入するので、制
御の雑音となり、フイードバツク制御が不安定に
なる。また機関の運転条件が中負荷域であつてヒ
ータの発熱量をそれほど必要としない場合でも、
ヒータには最大電流が供給されるので、電力を無
駄に消費することになり、燃費性能にも悪影響を
及ぼすおそれがあつた。 In other words, when the operating conditions of the engine change from a high load range to a low load range, the maximum current is suddenly applied to the heater, causing an instantaneous fluctuation in battery voltage, and this fluctuation is mixed into the output of the oxygen sensor. This causes control noise and makes feedback control unstable. Also, even if the engine operating conditions are in the medium load range and the heater does not require much heat output,
Since the maximum current is supplied to the heater, electric power is wasted, which may have a negative effect on fuel efficiency.
本発明は上記の問題を解決するためになされた
ものであり、排気温度に相関する運転状態信号
（機関の回転速度、燃料噴射パルス巾、吸入負
圧、絞り弁開度、吸入空気量等）に基づいて排気
温度を判定し、その結果に応じてヒータ電流を微
細に制御することにより、運転条件に対応したヒ
ータ電流制御を行なうことの出来るヒータ電流制
御回路を提供することを目的とする。 The present invention was made to solve the above problem, and uses operating status signals (engine rotational speed, fuel injection pulse width, suction negative pressure, throttle valve opening, intake air amount, etc.) that correlate with exhaust temperature. It is an object of the present invention to provide a heater current control circuit that can perform heater current control corresponding to operating conditions by determining exhaust temperature based on the temperature and finely controlling the heater current according to the result.
以下図面に基づいて本発明を詳細に説明する。 The present invention will be explained in detail below based on the drawings.
第１図は本発明に用いるヒータ付基準酸素極内
蔵型酸素センサ（以下、ヒータ付酸素センサと略
称する）の一例の断面図である。 FIG. 1 is a sectional view of an example of an oxygen sensor with a built-in reference oxygen electrode with a heater (hereinafter abbreviated as an oxygen sensor with a heater) used in the present invention.
第１図において、排気ガスの流入する小孔１を
備えたルーバ２の内部にセンサ本体３が設置さ
れ、センサ本体３からヒータ用リード線４、セン
サ用リード線５及びアース用リード線６が取り出
されている。 In FIG. 1, a sensor main body 3 is installed inside a louver 2 having a small hole 1 through which exhaust gas flows, and a heater lead wire 4, a sensor lead wire 5, and a grounding lead wire 6 are connected from the sensor main body 3. It has been taken out.
各リード線４〜６は、ムライト絶縁筒７、アル
ミナ粉体絶縁部８、アルミナ絶縁筒９等によつて
絶縁され、コネクタ１０まで到達する。なおこれ
らの絶縁物及びリード線は、ホルダ１１に内蔵さ
れている。 Each of the lead wires 4 to 6 is insulated by a mullite insulating tube 7, an alumina powder insulating section 8, an alumina insulating tube 9, etc., and reaches the connector 10. Note that these insulators and lead wires are built into the holder 11.
上記のヒータ付酸素センサのうちの先端部分、
すなわちＡ−A′線から左側の部分のみが排気マ
ニホルドに挿入される。 The tip of the above oxygen sensor with heater,
That is, only the portion to the left of the line A-A' is inserted into the exhaust manifold.
次に第２図は、センサ本体３の斜視図である。 Next, FIG. 2 is a perspective view of the sensor main body 3.
第２図において、上部アルミナ基板１２と下部
アルミナ基板１３との間に白金線ヒータ１４（ヒ
ータ用リード線４及びアース用リード線６に接
続）が設置されている。 In FIG. 2, a platinum wire heater 14 (connected to the heater lead wire 4 and the ground lead wire 6) is installed between the upper alumina substrate 12 and the lower alumina substrate 13.
また上部アルミナ基板１２の上に、基準酸素極
１５（センサ用リード線５に接続）、固体電解質
１６、白金電極１７（アース用リード線６に接
続）が層状に構成されている。そして１５〜１７
の全体を保護層（図示省略）が覆つている。なお
保護層は、白金電極等を有効に保護し、かつ排気
ガス中の酸素分子が容易に通過出来る程度の細孔
が多数開いたものであり、例えばカルシウム・ジ
ルコネツトの粉体をプラズマ溶射して作る。 Further, on the upper alumina substrate 12, a reference oxygen electrode 15 (connected to the sensor lead wire 5), a solid electrolyte 16, and a platinum electrode 17 (connected to the ground lead wire 6) are arranged in layers. and 15-17
A protective layer (not shown) covers the entire area. The protective layer effectively protects the platinum electrode, etc., and has a large number of pores that allow oxygen molecules in the exhaust gas to easily pass through. For example, the protective layer is made by plasma spraying calcium zirconet powder. make.
上記のごときヒータ付酸素センサにおいては、
センサ周囲の被検査ガス中の酸素分圧と基準酸素
極１５の酸素分圧との比較により、被検査ガス中
の酸素濃度を検出するが、この際、基準酸素極１
５に被検査ガス側から基準となる酸素を供給する
必要がある。 In the above-mentioned oxygen sensor with a heater,
The oxygen concentration in the test gas is detected by comparing the oxygen partial pressure in the test gas around the sensor with the oxygen partial pressure at the reference oxygen electrode 15.
5, it is necessary to supply oxygen as a reference from the gas to be inspected side.
このためセンサ用リード線５（＋側）とアース
用リード線６（−側）との間に電流を流すことに
より、被検査ガス側から酸素イオンを基準酸素極
１５に取り込み、基準酸素極１５の酸素分圧をほ
ぼ一定に保つように構成されている。 Therefore, by passing a current between the sensor lead wire 5 (+ side) and the grounding lead wire 6 (- side), oxygen ions are taken into the reference oxygen electrode 15 from the test gas side, and the reference oxygen electrode 15 The oxygen partial pressure is kept almost constant.
次に、第３図は本発明の一実施例図である。 Next, FIG. 3 is a diagram showing an embodiment of the present invention.
第３図において、１８は電源（自動車のバツテ
リ）、１９はヒータ付酸素センサのセンサ部（第
２図の１５〜１７の部分に相当）、２０はヒータ
付酸素センサのヒータ部（第２図の１４に相当）
である。 In Fig. 3, 18 is a power source (automobile battery), 19 is a sensor part of an oxygen sensor with a heater (corresponding to parts 15 to 17 in Fig. 2), and 20 is a heater part of an oxygen sensor with a heater (corresponding to parts 15 to 17 in Fig. 2). (equivalent to 14)
It is.
また２１は電流流し込み回路であり、この回路
を介して電源１８からセンサ部１９に電流を流す
ことにより、前記のごとく基準酸素極の酸素分圧
を一定に保つている。 Reference numeral 21 denotes a current injecting circuit, and by passing current from the power source 18 to the sensor section 19 via this circuit, the oxygen partial pressure at the reference oxygen electrode is kept constant as described above.
また２２は空燃比制御装置であり、センサ部１
９の出力（センサ用リード線５の電圧）が排気ガ
ス中の酸素濃度に対応した信号として空燃比制御
装置２２に送られる。 Further, 22 is an air-fuel ratio control device, and the sensor section 1
9 (voltage of the sensor lead wire 5) is sent to the air-fuel ratio control device 22 as a signal corresponding to the oxygen concentration in the exhaust gas.
次に２３は排気温度に相関する運転状態信号で
ある。 Next, 23 is an operating state signal that correlates with exhaust temperature.
運転状態信号２３としては、例えば機関の回転
速度に対応した信号、燃料噴射パルス、吸入空気
量又は吸入負圧に対応した信号、絞り弁開度に対
応した信号又はこれらの各信号のうちのいくつか
を組合せたものを用いることが出来る。 The operating state signal 23 may be, for example, a signal corresponding to the rotational speed of the engine, a signal corresponding to a fuel injection pulse, an intake air amount or an intake negative pressure, a signal corresponding to the throttle valve opening, or some of these signals. A combination of these can be used.
次に２４は制御回路であり、運転状態信号２３
によつて排気温度を判定し、その結果に応じた制
御信号を出力する。 Next, 24 is a control circuit, and an operating state signal 23
The exhaust temperature is determined by , and a control signal is output according to the result.
この制御信号によつてステツプモータ２５の回
転角を制御すれば、ステツプモータ２５と連動す
る可変抵抗器２６の抵抗値が変化し、ヒータ部２
０に流れる電流が変化するので、ヒータ部２０に
よる発熱量を制御することが出来る。 If the rotation angle of the step motor 25 is controlled by this control signal, the resistance value of the variable resistor 26 interlocked with the step motor 25 changes, and the heater section 2
Since the current flowing to zero changes, the amount of heat generated by the heater section 20 can be controlled.
例えば、制御回路２４は、始動直後のアイドリ
ング時等で排気温度が低いと判定した場合は、可
変抵抗器２６の可動片２７がＡに接するようにス
テツプモータ２５を制御する。可動片２７がＡ点
に接している場合には、ヒータ部２０は直接に電
源１８に接続され、最大電流が流れるので発熱量
は最大になる。 For example, if the control circuit 24 determines that the exhaust gas temperature is low, such as during idling immediately after startup, the control circuit 24 controls the step motor 25 so that the movable piece 27 of the variable resistor 26 contacts point A. When the movable piece 27 is in contact with point A, the heater section 20 is directly connected to the power source 18, and the maximum current flows, so that the amount of heat generated is maximum.
次に、暖機が完了し、排気温度がある程度（約
300℃）上昇し、無負荷運転から負荷運転になつ
た場合には、可動片２７がＡ点とＢ点との間にく
るようにし、かつ負荷が大きくなるにつれてＢ点
に近づくようにステツプモータ２５を制御する。 Next, warm-up is completed and the exhaust temperature reaches a certain level (approximately
300℃), and when the operation changes from no-load operation to load operation, move the step motor so that the movable piece 27 is between points A and B, and as the load increases, it approaches point B. 25.
このように制御すれば、負荷が大きくなつて排
気温度が高くなるほど、ヒータ部２０に流れる電
流は減少し、発熱量は低下する。 By controlling in this way, as the load becomes larger and the exhaust gas temperature becomes higher, the current flowing through the heater section 20 decreases, and the amount of heat generated decreases.
次に運転状態が高負荷域に入り、排気温度が約
600℃を越えると判定した場合には、可動片２７
がＢ点とＣ点との間に入るようにステツプモータ
２５を制御する。Ｂ点Ｃ点間は絶縁体で形成され
ており、可動片２７がこの範囲にある場合は、ヒ
ータ部２０を流れる電流は零となる。 Next, the operating state enters the high load range, and the exhaust temperature drops to approximately
If it is determined that the temperature exceeds 600℃, the movable piece 27
The step motor 25 is controlled so that the distance is between points B and C. An insulator is formed between point B and point C, and when the movable piece 27 is within this range, the current flowing through the heater section 20 becomes zero.
なお上記のように制御する場合の制御回路２４
としては、例えば、始動後の暖機完了を検出する
ために用いる始動時点から所定時間のあいだ動作
するタイマ回路と、負荷の大きさ（例えば吸入空
気量信号によつて計測）に対応した制御信号を出
力する回路とを組合せて構成することが出来る。 In addition, the control circuit 24 when controlling as described above
For example, a timer circuit that operates for a predetermined period of time from the start point used to detect the completion of warm-up after startup, and a control signal that corresponds to the size of the load (for example, measured by the intake air amount signal). It can be configured in combination with a circuit that outputs.
次に、第４図は本発明の第２の実施例図であ
る。 Next, FIG. 4 is a diagram showing a second embodiment of the present invention.
第４図の実施例は、第３図のステツプモータと
可変抵抗器との代りに、抵抗R1〜R3とスイツチ
ング回路２９〜３２（トランジスタ又はリレー等
によつて構成する）とを用いて、ヒータ部２０に
流す電流を制御するように構成したものである。 The embodiment shown in FIG. 4 uses resistors R1 to R3 and switching circuits 29 to 32 (consisting of transistors, relays, etc.) in place of the step motor and variable resistor shown in FIG. , the current flowing through the heater section 20 is controlled.
すなわち、排気温度が非常に低いと判定した場
合には、制御回路２８はスイツチング回路２９〜
３２を全てオンにする。そのためヒータ部２０に
は最大電流が流れる。 That is, when it is determined that the exhaust gas temperature is extremely low, the control circuit 28 switches the switching circuits 29 to 29 to
Turn on all 32. Therefore, the maximum current flows through the heater section 20.
次に制御回路２８は、排気温度が上昇するにつ
れてスイツチング回路２９〜３２を順次オフにす
るように制御する。前記スイツチング回路にトラ
ンジスタ等の電子回路を用いることが可能なこと
は当然である。 Next, the control circuit 28 controls the switching circuits 29 to 32 to be sequentially turned off as the exhaust gas temperature rises. It goes without saying that an electronic circuit such as a transistor can be used for the switching circuit.
スイツチング回路２９がオフになると、ヒータ
部２０と電源１８との間に、抵抗R1が直列に接
続されるので流れる電流が低下する。 When the switching circuit 29 is turned off, a resistor R1 is connected in series between the heater section 20 and the power source 18, so that the current flowing therein decreases.
排気温度が上昇するにつれてスイツチング回路
３０，３１がオフになると、直列に挿入される抵
抗はR1からR1＋R2、R1＋R2＋R3と増加し、した
がつてヒータ部２０を流れる電流は、排気温度が
上昇するにつれて減少する。 When the switching circuits 30 and 31 are turned off as the exhaust gas temperature rises, the resistance inserted in series increases from R 1 to R 1 +R 2 to R 1 +R 2 +R 3 , so that the current flowing through the heater section 20 decreases. decreases as the exhaust temperature increases.
運転状態が高負荷域に入り排気温度が600℃を
越えると判定した場合には、スイツチング回路３
２もオフになり、そのためヒータ部２０を流れる
電流は零になる。 If it is determined that the operating state is in the high load range and the exhaust temperature exceeds 600℃, switching circuit 3
2 is also turned off, so the current flowing through the heater section 20 becomes zero.
上記のように第３図及び第４図の回路によれ
ば、排気温度に応じてヒータ部に流す電流を制御
することが出来る。 As described above, according to the circuits shown in FIGS. 3 and 4, it is possible to control the current flowing through the heater section according to the exhaust temperature.
以上説明したごとく本発明によれば、排気温度
に相関する運転状態信号に基づいて排気温度を判
定し、その結果に基づいてヒータ電流を微細に制
御するように構成したので、従来装置のヒータ電
流が零から急に最大値になるときに出力される雑
音をなくすることが出来、また中負荷域では必要
最小限の電流を供給するので、無駄な電流消費を
なくし、燃費性能を向上させることが出来る。 As explained above, according to the present invention, the exhaust gas temperature is determined based on the operating status signal correlated to the exhaust gas temperature, and the heater current is finely controlled based on the result. It is possible to eliminate the noise that is output when the current suddenly increases from zero to the maximum value, and it also supplies the minimum necessary current in the medium load range, eliminating unnecessary current consumption and improving fuel efficiency. I can do it.
第１図は本発明に用いるヒータ付酸素センサの
一例の断面図、第２図はセンサ本体の斜視図、第
３図及び第４図はそれぞれ本発明の実施例図であ
る。
符号の説明、１……小孔、２……ルーバ、３…
…センサ本体、４……ヒータ用リード線、５……
センサ用リード線、６……アース用リード線、７
……ムライト絶縁筒、８……アルミナ粉体絶縁
部、９……アルミナ絶縁筒、１０……コネクタ、
１１……ホルダ、１２……上部アルミナ基板、１
３……下部アルミナ基板、１４……白金線ヒー
タ、１５……基準酸素極、１６……固体電解質、
１７……白金電極、１８……電源、１９……セン
サ部、２０……ヒータ部、２１……電流流し込み
回路、２２……空燃比制御装置、２３……運転状
態信号、２４……制御回路、２５……ステツプモ
ータ、２６……可変抵抗器、２７……可動片、２
８……制御回路。
FIG. 1 is a sectional view of an example of an oxygen sensor with a heater used in the present invention, FIG. 2 is a perspective view of the sensor body, and FIGS. 3 and 4 are illustrations of embodiments of the present invention. Explanation of symbols, 1...small hole, 2...louver, 3...
...Sensor body, 4...Heater lead wire, 5...
Sensor lead wire, 6... Ground lead wire, 7
...Mullite insulating tube, 8...Alumina powder insulation section, 9...Alumina insulating tube, 10...Connector,
11... Holder, 12... Upper alumina substrate, 1
3... Lower alumina substrate, 14... Platinum wire heater, 15... Reference oxygen electrode, 16... Solid electrolyte,
17...Platinum electrode, 18...Power source, 19...Sensor section, 20...Heater section, 21...Current injection circuit, 22...Air-fuel ratio control device, 23...Operating status signal, 24...Control circuit , 25...Step motor, 26...Variable resistor, 27...Movable piece, 2
8...Control circuit.
Claims (1)
内蔵型酸素センサを用いて内燃機関の排気ガス中
の酸素濃度を検出し、その結果に基づいて燃料供
給量をフイードバツク制御することにより、混合
気の空燃比を目標値に一致させるように制御する
空燃比制御装置において、排気温度に相関する運
転状態信号に基づいて排気温度を判定し、その結
果に対応して加熱用のヒータに流す電流を連続的
又は多段階に変化させる回路を備えたヒータ電流
制御回路。 ２ 上記運転状態信号として、内燃機関の回転速
度、燃料噴射パルス巾、吸入負圧、絞り弁開度、
吸入空気量のうちの一つ又は二つ以上の組合せを
用いたことを特徴とする特許請求の範囲第１項記
載のヒータ電流制御回路。[Claims] 1. Detecting the oxygen concentration in the exhaust gas of an internal combustion engine using an oxygen sensor with a built-in heater-equipped reference oxygen electrode, and controlling the fuel supply amount based on the result. In the air-fuel ratio control device that controls the air-fuel ratio of the air-fuel mixture to match the target value, the exhaust temperature is determined based on the operating status signal that correlates with the exhaust temperature, and the heating A heater current control circuit equipped with a circuit that changes the current flowing through the heater continuously or in multiple stages. 2 The above operating status signals include the rotational speed of the internal combustion engine, fuel injection pulse width, suction negative pressure, throttle valve opening,
The heater current control circuit according to claim 1, characterized in that one or a combination of two or more of the intake air amounts is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3402380A JPS56130650A (en) | 1980-03-19 | 1980-03-19 | Control circuit of heater current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3402380A JPS56130650A (en) | 1980-03-19 | 1980-03-19 | Control circuit of heater current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56130650A JPS56130650A (en) | 1981-10-13 |
| JPS6125308B2 true JPS6125308B2 (en) | 1986-06-14 |
Family
ID=12402774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3402380A Granted JPS56130650A (en) | 1980-03-19 | 1980-03-19 | Control circuit of heater current |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56130650A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5883251A (en) * | 1981-11-12 | 1983-05-19 | Japan Electronic Control Syst Co Ltd | Oxygen concentration sensor for internal combustion engine |
| JPS6058548A (en) * | 1983-09-12 | 1985-04-04 | Ngk Spark Plug Co Ltd | Air/fuel ratio sensor of engine |
| JPS60164241A (en) * | 1984-02-06 | 1985-08-27 | Nippon Denso Co Ltd | Heater control device for oxygen concentration sensor |
| JPS60202350A (en) * | 1984-03-28 | 1985-10-12 | Toyota Motor Corp | Control apparatus of heater for oxygen sensor |
| JPS60202349A (en) * | 1984-03-28 | 1985-10-12 | Toyota Motor Corp | Control apparatus of heater for oxygen sensor |
| JPS60235047A (en) * | 1984-05-07 | 1985-11-21 | Toyota Motor Corp | Method for controlling temperature of oxygen sensor with heater for internal-combustion engine |
| JPS60235048A (en) * | 1984-05-07 | 1985-11-21 | Toyota Motor Corp | Method for controlling supply of current to resistance heat generation type electric heater of oxygen sensor |
| JPH0627721B2 (en) * | 1985-09-26 | 1994-04-13 | 本田技研工業株式会社 | Control method of oxygen concentration sensor |
| JPS6278469A (en) * | 1985-09-30 | 1987-04-10 | Mitsubishi Electric Corp | Exhaust gas recirculation control device for engine |
| JPH01147139A (en) * | 1987-12-01 | 1989-06-08 | Mitsubishi Electric Corp | Air-fuel ratio detector for internal combustion engine |
-
1980
- 1980-03-19 JP JP3402380A patent/JPS56130650A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56130650A (en) | 1981-10-13 |
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