JPH01232106A - Detector of deterioration of catalyst - Google Patents
Detector of deterioration of catalystInfo
- Publication number
- JPH01232106A JPH01232106A JP63057508A JP5750888A JPH01232106A JP H01232106 A JPH01232106 A JP H01232106A JP 63057508 A JP63057508 A JP 63057508A JP 5750888 A JP5750888 A JP 5750888A JP H01232106 A JPH01232106 A JP H01232106A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- temperature
- deterioration
- detected
- catalytic converter
- 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
- 239000003054 catalyst Substances 0.000 title claims abstract description 80
- 230000006866 deterioration Effects 0.000 title claims abstract description 36
- 230000003197 catalytic effect Effects 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 20
- 239000000498 cooling water Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
-
- 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
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、自動車等内燃機関の触媒劣化検出装置に係り
、特に、触媒の転化効率の劣化を精度良く検出する装置
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a catalyst deterioration detection device for internal combustion engines such as automobiles, and more particularly to a device that accurately detects deterioration in conversion efficiency of a catalyst.
(従来の技術)
近時、自動車等のエンジンに対する要求が高度化してお
り、排出ガス低減、高出力、低燃費等圧いに相反する課
題についてそのいづれも高レベルでその達成が求められ
る傾向にある。また、特に機関の排気ガス規制は近年厳
しさを増しており、そのため、例えば触媒等を用いてC
01HC,NOx等有害排出成分の低減が図られている
。(Conventional technology) In recent years, the requirements for automobile engines have become more sophisticated, and there is a tendency for contradictory issues such as reduced exhaust gas, high output, and low fuel consumption to be achieved at a high level. be. In addition, engine exhaust gas regulations in particular have become stricter in recent years, and therefore, for example, using catalysts etc.
01 Efforts are being made to reduce harmful exhaust components such as HC and NOx.
従来のこの種の触媒コンバータの劣化を検出する装置と
しては、例えば特開昭56−88919号公報(高温度
警報器)に記載されたものがある。As a conventional device for detecting deterioration of a catalytic converter of this kind, there is one described, for example, in Japanese Patent Application Laid-Open No. 56-88919 (High Temperature Alarm).
この装置は、触媒コンバータ内の酸化反応熱の温度異常
上昇を感知し、運転者に知らせる装置であり、排気温度
センサ、スイッチングモジュール、排気温度警告灯から
構成される。そして、例えば排気温度が850℃以上に
なると、触媒コンバータ内の触媒が異常な温度上昇を呈
しているとして、運転者に警報を発している。This device detects an abnormal temperature rise in the heat of oxidation reaction within the catalytic converter and notifies the driver, and is comprised of an exhaust temperature sensor, a switching module, and an exhaust temperature warning light. For example, when the exhaust gas temperature exceeds 850° C., a warning is issued to the driver, indicating that the catalyst in the catalytic converter is exhibiting an abnormal temperature rise.
(発明が解決しようとする課題)
しかしながら、このような従゛来の触媒劣化検出′!j
t置にあっては、排気温度センサの出力に基づいて触媒
コンバータ内の触媒温度の異常上昇を警報する構成とな
っていたため、触媒温度の異常は検出できるものの、触
媒の転化性能の劣化は正確に検出できない、したがって
、実際に触媒が劣化したかどうかの正確な判断ができず
、有害排出ガス成分の低下を必ずしも効率良く図ること
ができないという問題点があった。(Problems to be Solved by the Invention) However, such conventional catalyst deterioration detection'! j
The system was configured to warn of abnormal rises in the catalyst temperature in the catalytic converter based on the output of the exhaust temperature sensor, so although abnormalities in the catalyst temperature could be detected, it was not possible to accurately detect deterioration in the conversion performance of the catalyst. Therefore, it is not possible to accurately determine whether the catalyst has actually deteriorated, and there is a problem that it is not always possible to efficiently reduce harmful exhaust gas components.
(発明の目的)
そこで本発明は、エンジンの運転状態から定まる条件と
触媒温度との間に相関があることに着目し、触媒の劣化
を精度良く検出することのできる触媒劣化検出装置゛を
提供することを目的としている。(Objective of the Invention) Therefore, the present invention focuses on the fact that there is a correlation between the conditions determined from the operating state of the engine and the catalyst temperature, and provides a catalyst deterioration detection device that can accurately detect catalyst deterioration. It is intended to.
(課題を解決するための手段)
本考案による触媒劣化検出装置は上記目的達成のため、
その基本概念図を第1図に示すように、エンジンの運転
状態を検出する運転状態検出手段aと、触媒コンバータ
の触媒温度を検出する触媒温度検出手段すと、エンジン
の運転状態に基づいて触媒コンバータの触媒の基準温度
を設定する基準温度設定手段Cと、触媒コンバータの触
媒温度を前記基準温度と比較して触媒の劣化を検出する
劣化検出手段dと、を備えている。(Means for solving the problem) In order to achieve the above purpose, the catalyst deterioration detection device according to the present invention has the following features:
As the basic conceptual diagram is shown in Fig. 1, the operating state detection means a detects the operating state of the engine, and the catalyst temperature detecting means detects the catalyst temperature of the catalytic converter. The apparatus includes a reference temperature setting means C for setting a reference temperature of the catalyst of the converter, and a deterioration detection means d for detecting deterioration of the catalyst by comparing the catalyst temperature of the catalytic converter with the reference temperature.
(作用)
本発明では、エンジンの運転条件より定まる触媒基準温
度と実際の触媒温度との差から触媒の劣化が判別される
。(Operation) In the present invention, deterioration of the catalyst is determined from the difference between the catalyst reference temperature determined from the engine operating conditions and the actual catalyst temperature.
したがって、触媒コンバータの劣化が正確に検出され、
有害排出成分の増加が有効に防止される。Therefore, deterioration of the catalytic converter is accurately detected and
An increase in harmful exhaust components is effectively prevented.
(実施例) 以下、本発明を図面に基づいて説明する。(Example) Hereinafter, the present invention will be explained based on the drawings.
第2〜5図は本発明に係る触媒劣化検出装置の一実施例
を示す図である。2 to 5 are diagrams showing an embodiment of the catalyst deterioration detection device according to the present invention.
まず、構成を説明する。第2図において、1はエンジン
であり、吸入空気はエアクリーナ2より吸気管−3を通
して各気筒に供給され、燃料は噴射信号Siに基づきイ
ンジェクタ4により噴射される。気筒内で燃焼した排気
は排気管5を通して触媒コンバータ6に導入され、触媒
コンバータ内で排気中の有害成分(Go、HC,N0x
)を三元触媒により清浄化して排出される。First, the configuration will be explained. In FIG. 2, reference numeral 1 denotes an engine, intake air is supplied from an air cleaner 2 to each cylinder through an intake pipe 3, and fuel is injected by an injector 4 based on an injection signal Si. The exhaust gas burned in the cylinder is introduced into the catalytic converter 6 through the exhaust pipe 5, and the harmful components (Go, HC, NOx) in the exhaust gas are removed in the catalytic converter.
) is purified by a three-way catalyst and discharged.
吸入空気の流11Qaはエアフローメーク7により検出
され、吸気管3内の絞弁8によって制御される。絞弁8
の開度TVOは絞弁開度センサ9により検出される。ま
た、エンジン1の回転数Nはクランク角センサ10によ
り検出され、ウォータジャケットを流れる冷却水の温度
Twは水温センサ11により検出される。さらに、触媒
コンバータ6の触媒温度Tdは触媒温度センサ(触媒温
度検出手段)12により検出される。また、車速Vsp
は車速センサ13により検出される。The intake air flow 11Qa is detected by an air flow make 7 and controlled by a throttle valve 8 in the intake pipe 3. Throttle valve 8
The opening TVO is detected by the throttle valve opening sensor 9. Further, the rotational speed N of the engine 1 is detected by a crank angle sensor 10, and the temperature Tw of the cooling water flowing through the water jacket is detected by a water temperature sensor 11. Further, the catalyst temperature Td of the catalytic converter 6 is detected by a catalyst temperature sensor (catalyst temperature detection means) 12. In addition, vehicle speed Vsp
is detected by the vehicle speed sensor 13.
上記エアフローメータ7、絞弁開度センサ9、クランク
角センサ10、水温センテ11および車速センサ13は
運転状態検出手段14を構成しており、運転状態検出手
段14および触媒温度センサ12からの出力はコントロ
ールユニット20に入力される。コントロールユニット
20は基準温度設定手段および劣化検出手段としての機
能を有し、CP U21、ROM22、RAM23、N
VM (不揮発性メモリ)24およびI10ボート25
により構成される。CPU21はROM22に書き込ま
れているプログラムに従ってI10ボート25より必要
とする外部データを取込んだり、またRAM23および
NVM24との間でデータの授受を行ったりしながら、
燃料噴射制御および排気系にある触媒コンバータ6の劣
化を検出する処理値を演算処理し、必要に応じて処理し
たデータをI10ポート25へ出力する。I10ポート
25には運転状態検出手段14および触媒温度センサ1
2からの信号が入力されるとともに、I10ボート25
からは噴射信号Siおよび警報信号Arが出力される。The air flow meter 7, throttle valve opening sensor 9, crank angle sensor 10, water temperature sensor 11 and vehicle speed sensor 13 constitute the driving state detecting means 14, and the outputs from the driving state detecting means 14 and the catalyst temperature sensor 12 are It is input to the control unit 20. The control unit 20 has functions as reference temperature setting means and deterioration detection means, and includes CPU 21, ROM 22, RAM 23, N
VM (non-volatile memory) 24 and I10 boat 25
Consisted of. The CPU 21 reads necessary external data from the I10 boat 25 according to the program written in the ROM 22, and also exchanges data with the RAM 23 and NVM 24.
Processing values for fuel injection control and detecting deterioration of the catalytic converter 6 in the exhaust system are processed, and the processed data is output to the I10 port 25 as necessary. The I10 port 25 is connected to the operating state detection means 14 and the catalyst temperature sensor 1.
2 is input, and the I10 port 25
An injection signal Si and an alarm signal Ar are outputted from.
ROM22はCPU21における演算プログラムを格納
しており、RAM23およびNVM24は演算に使用す
るデータをマツプ等の形で記憶している。また、警報信
号Arは発光ダイオード26に入力されており、発光ダ
イオード26は触媒の異常時に点灯して触媒コンバータ
6の劣化を運転者に警告する。The ROM 22 stores calculation programs for the CPU 21, and the RAM 23 and NVM 24 store data used in calculations in the form of a map or the like. Further, the alarm signal Ar is input to a light emitting diode 26, which lights up when the catalyst is abnormal to warn the driver of deterioration of the catalytic converter 6.
次に、作用を説明する。Next, the effect will be explained.
第3図はROM22に書き込まれている触媒コンバータ
ロの劣化判別制御のプログラムを示すフローチャートで
あり、本プログラムはエンジン回転に同期して1度実行
される。FIG. 3 is a flowchart showing a program for controlling deterioration determination of the catalytic converter, which is written in the ROM 22, and this program is executed once in synchronization with the engine rotation.
まず、P、でエンジン回転数Nを検出し、P2で絞弁8
の開度TVOを読み込み、さらにP、で車速Vspを読
み込む。次いで、P4で冷却水の温度TWを読み込み、
P、で冷却水の温度Twを所定値Twoと比較する。’
pw<Twoのときはエンジン1が十分暖気していない
と判断して今回のルーチンを終了する。First, the engine speed N is detected at P, and the throttle valve 8 is detected at P2.
Read the opening TVO at P, and read the vehicle speed Vsp at P. Next, read the cooling water temperature TW in P4,
At P, the temperature Tw of the cooling water is compared with a predetermined value Two. '
When pw<Two, it is determined that the engine 1 is not sufficiently warmed up, and the current routine is ended.
一方、Tw≧Twoのときは暖気が完了していると判断
してP6に進む。P、ではエンジン1の回転数N、絞弁
8の開度TVO1車速Vspおよび冷却水の温度Twと
いう運転状態を表す各種パラメータに基づいて、触媒温
度の基準温度Tstを演算する。この触媒基準温度TS
tはエンジンlの運転状態に基づいて予め設定されるも
ので、触媒コンバータ6の劣化が起きず正常な動作を呈
するような温度であり、例えば実験等により定められる
。その具体的なデータは第4.5図のように示される。On the other hand, when Tw≧Two, it is determined that warming up has been completed and the process proceeds to P6. At P, a reference temperature Tst of the catalyst temperature is calculated based on various parameters representing the operating state, such as the rotational speed N of the engine 1, the opening degree TVO1 of the throttle valve 8, the vehicle speed Vsp, and the temperature Tw of the cooling water. This catalyst reference temperature TS
t is preset based on the operating state of the engine l, and is a temperature at which the catalytic converter 6 does not deteriorate and exhibits normal operation, and is determined, for example, by experiment. The specific data is shown in Figure 4.5.
第4図は車速VspがOkm/hの場合であり、第5図
は車速Vspが100 km / hの場合である。FIG. 4 shows the case where the vehicle speed Vsp is Okm/h, and FIG. 5 shows the case where the vehicle speed Vsp is 100 km/h.
これらの図から明らかであるように、エンジンlの回転
数転数N、絞弁8の開度TVOおよび車速Vspにより
触媒コンバータ6内における触媒の正常であるべき温度
が、低負荷では低(、高負荷では高くなることが示され
ている。したがって、これらのデータをROM22の中
にあらかじめマツプとして記憶しておく。なお、第4.
5図は0および100w/h時のデータを示しているが
、0と1100k/hの間の中間車速は補間演算を行っ
て求める。As is clear from these figures, the temperature of the catalyst in the catalytic converter 6, which should be normal, is low (, It has been shown that the load increases with high loads. Therefore, these data are stored in advance as a map in the ROM 22. Note that Section 4.
Although FIG. 5 shows data at 0 and 100 w/h, intermediate vehicle speeds between 0 and 1100 k/h are obtained by performing interpolation calculations.
再び第3図に戻って、P、では実際の触媒温度Tcを読
み込み、P8で触媒温度Tcと上述の触媒基、準温度’
rstとの差値Δtを求め、この差値Δtが所定値を越
えているか否かを判別する。差値Δtが所定値より大き
いときは、触媒コンバータ6の触媒は正常であると判断
して本ルーチンを終了する。一方、上記差値Δtが所定
値より小さいときは触媒が異常、すなわち、このように
両者の差値Δtが所定値より小さいときは、触媒温度T
cが十分上昇しないから触媒が劣化していると判断し、
P、で警報信号Arを出力して発光ダイオード26を点
灯して運転者に警告する。Returning to FIG. 3 again, at P, the actual catalyst temperature Tc is read, and at P8, the catalyst temperature Tc and the above-mentioned catalyst base, quasi-temperature '
A difference value Δt from rst is determined, and it is determined whether this difference value Δt exceeds a predetermined value. When the difference value Δt is larger than the predetermined value, it is determined that the catalyst of the catalytic converter 6 is normal, and this routine is ended. On the other hand, when the difference value Δt is smaller than the predetermined value, the catalyst is abnormal. In other words, when the difference value Δt between the two is smaller than the predetermined value, the catalyst temperature T
Since c does not rise sufficiently, it is determined that the catalyst has deteriorated,
At P, an alarm signal Ar is output and the light emitting diode 26 is turned on to warn the driver.
このように本実施例では、実際の触媒温度Tcを検出す
るとともに、この触媒温度Tcをエンジンlの運転状態
によって定まる触媒基準温度Tstと比較し、両者の差
値Δtが所定値より小さいときには、触媒温度Tcが十
分上昇せず、触媒が劣化していると判断しているので、
触媒の劣化を正確に判別することができる。そして、触
媒の劣化が判別されたときには、運転者は発光ダイオー
ド26の点灯によりその旨が理解され、直ちに必要な処
置、例えば工場で整備を行う等の有効な対策を行うこと
ができる。In this way, in this embodiment, the actual catalyst temperature Tc is detected, and this catalyst temperature Tc is compared with the catalyst reference temperature Tst determined by the operating state of the engine l, and when the difference value Δt between the two is smaller than a predetermined value, Since the catalyst temperature Tc has not risen sufficiently and it has been determined that the catalyst has deteriorated,
Deterioration of the catalyst can be accurately determined. When deterioration of the catalyst is determined, the driver is informed by the lighting of the light emitting diode 26 and can immediately take necessary measures, such as maintenance at the factory.
その結果、この触媒劣化検出装置を搭載した一車両にあ
っては、触媒の劣化状態を知らずに長期に亘って走行す
るという事態が解消され、結果的に有害排出成分の増加
を有効に防止することができ、エミッション特性の向上
に寄与することができる。As a result, a vehicle equipped with this catalyst deterioration detection device will no longer be driven for a long period of time without knowing the deterioration state of the catalyst, and as a result, an increase in harmful exhaust components can be effectively prevented. This can contribute to improving emission characteristics.
なお、本実施例では、エンジン1の運転状態を検出する
ものとしてエンジン1の回転数N、絞弁8の開度TVO
1車速Vsp等のパラメータを用いているが、このよう
なパラメータに限らずその他のパラメータを用いてさら
に有効な判別を行うようにしても良いのは勿論である。In this embodiment, the operating state of the engine 1 is detected using the rotational speed N of the engine 1 and the opening degree TVO of the throttle valve 8.
Although parameters such as 1-vehicle speed Vsp are used, it is of course possible to use other parameters in addition to such parameters for more effective determination.
また、触媒コンバータ6の種類も例えば、三元触媒等に
限らず、酸化触媒等でも良い。要は、現実の触媒温度T
cと触媒基準温度Tstとの差から触媒の劣化を有効に
検出できるものであれば全てに適用ができる。Further, the type of the catalytic converter 6 is not limited to a three-way catalyst, but may also be an oxidation catalyst or the like. In short, the actual catalyst temperature T
This method can be applied to any device that can effectively detect deterioration of the catalyst from the difference between c and the catalyst reference temperature Tst.
(効果)
本発明によれば、エンジンの運転条件より定まる触媒基
準温度と実際の触媒温度とを比較して触媒の劣化をヤ1
別しているので、触媒コンバータ内の触媒の劣化を正確
に検出することができる。(Effects) According to the present invention, the deterioration of the catalyst can be checked by comparing the catalyst reference temperature determined by the engine operating conditions and the actual catalyst temperature.
Since they are separated, deterioration of the catalyst in the catalytic converter can be accurately detected.
その結果、本発明に係る触媒劣化検出装置を搭載した車
両にあっては、有害排気ガスの増加を有効に防止するこ
とができる。As a result, in a vehicle equipped with the catalyst deterioration detection device according to the present invention, an increase in harmful exhaust gas can be effectively prevented.
第1図は本発明の基本概念図、第2〜5図は本発明に係
る触媒劣化検出装置の一実施例を示す図であり、第2図
はその全体構成図、第3図はその触媒劣化の判別プログ
ラムを示すフローチャート、第4.5図はその車速と触
媒の基準温度との関係を示す図である。
l・・・・・・エンジン、
6・・・・・・触媒コンバータ、
12・・・・・・触媒温度センサ(触媒温度検出手段)
、14・・・・・・運転状態検出手段、
20・・・・・・コントロールユニット(基準温度検出
手段、劣化検出手段)。Figure 1 is a basic conceptual diagram of the present invention, Figures 2 to 5 are diagrams showing an embodiment of the catalyst deterioration detection device according to the present invention, Figure 2 is an overall configuration diagram thereof, and Figure 3 is a diagram of the catalyst. FIG. 4.5 is a flowchart showing the deterioration determination program, and is a diagram showing the relationship between the vehicle speed and the reference temperature of the catalyst. l...Engine, 6...Catalytic converter, 12...Catalyst temperature sensor (catalyst temperature detection means)
, 14... Operating state detection means, 20... Control unit (reference temperature detection means, deterioration detection means).
Claims (1)
、 b)触媒コンバータの触媒温度を検出する触媒温度検出
手段と、 c)エンジンの運転状態に基づいて触媒コンバータの触
媒の基準温度を設定する基準温度設定手段と、 d)触媒コンバータの触媒温度を前記基準温度と比較し
て触媒の劣化を検出する劣化検出手段と、を備えたこと
を特徴とする触媒劣化検出装置。[Scope of Claims] a) Operating state detection means for detecting the operating state of the engine; b) Catalyst temperature detection means for detecting the catalyst temperature of the catalytic converter; and c) A catalyst temperature detecting means for detecting the catalyst temperature of the catalytic converter based on the operating state of the engine. d) deterioration detection means for detecting deterioration of the catalyst by comparing the catalyst temperature of the catalytic converter with the reference temperature. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63057508A JPH01232106A (en) | 1988-03-11 | 1988-03-11 | Detector of deterioration of catalyst |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63057508A JPH01232106A (en) | 1988-03-11 | 1988-03-11 | Detector of deterioration of catalyst |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01232106A true JPH01232106A (en) | 1989-09-18 |
Family
ID=13057677
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63057508A Pending JPH01232106A (en) | 1988-03-11 | 1988-03-11 | Detector of deterioration of catalyst |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01232106A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04116212A (en) * | 1990-09-05 | 1992-04-16 | Honda Motor Co Ltd | Deterioration of catalyst temperature sensor detecting device |
US5255512A (en) * | 1992-11-03 | 1993-10-26 | Ford Motor Company | Air fuel ratio feedback control |
US5255511A (en) * | 1990-03-19 | 1993-10-26 | Emitec Gesellschaft Fuer Emissionstechnologie | Method and apparatus for operational monitoring of a catalytic converter of an internal combustion engine and a catalytic converter to be monitored |
US5307626A (en) * | 1990-03-19 | 1994-05-03 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Method and apparatus for controlling an internal combustion engine, using the current temperature of a downstream catalytic converter |
JP2012052807A (en) * | 2010-08-31 | 2012-03-15 | Hitachi-Ge Nuclear Energy Ltd | Method for monitoring catalytic performance of recombiner |
-
1988
- 1988-03-11 JP JP63057508A patent/JPH01232106A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5255511A (en) * | 1990-03-19 | 1993-10-26 | Emitec Gesellschaft Fuer Emissionstechnologie | Method and apparatus for operational monitoring of a catalytic converter of an internal combustion engine and a catalytic converter to be monitored |
US5307626A (en) * | 1990-03-19 | 1994-05-03 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Method and apparatus for controlling an internal combustion engine, using the current temperature of a downstream catalytic converter |
JPH04116212A (en) * | 1990-09-05 | 1992-04-16 | Honda Motor Co Ltd | Deterioration of catalyst temperature sensor detecting device |
US5255512A (en) * | 1992-11-03 | 1993-10-26 | Ford Motor Company | Air fuel ratio feedback control |
JP2012052807A (en) * | 2010-08-31 | 2012-03-15 | Hitachi-Ge Nuclear Energy Ltd | Method for monitoring catalytic performance of recombiner |
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