JPH0460106A - Control device of engine - Google Patents
Control device of engineInfo
- Publication number
- JPH0460106A JPH0460106A JP2171888A JP17188890A JPH0460106A JP H0460106 A JPH0460106 A JP H0460106A JP 2171888 A JP2171888 A JP 2171888A JP 17188890 A JP17188890 A JP 17188890A JP H0460106 A JPH0460106 A JP H0460106A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- temperature
- deterioration
- air
- fuel ratio
- 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 claims abstract description 79
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 230000006866 deterioration Effects 0.000 claims abstract description 25
- 238000000746 purification Methods 0.000 description 11
- 238000012937 correction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012041 precatalyst Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、排気系に配設した触媒装置の劣化を判定する
ようにしたエンジンの制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine control device that determines deterioration of a catalyst device disposed in an exhaust system.
(従来の技術)
従来より、エンジンの排気通路に排気ガスの有害成分を
反応浄化するために触媒装置を配設することが一般に行
われているが、この触媒装置の温度が異常に上昇すると
触媒そのものが溶損して浄化不能となることから、触媒
装置に温度センサを配設して所定温度以上に上昇した際
には警報を発するようにした技術が知られていると共に
、例えば、特開昭eO−27756号公報に見られるよ
うに、触媒温度センサの信号に基づいて減速燃料カット
時に触媒温度が所定値以下に停止した際には、燃料の供
給を開始して触媒の浄化性能を高めておくようにした技
術が公知である。(Prior Art) Conventionally, it has been common practice to install a catalyst device in the exhaust passage of an engine to react and purify harmful components of exhaust gas, but if the temperature of this catalyst device rises abnormally, the catalyst Since the catalytic converter itself melts and becomes impossible to purify, there is a known technology in which a temperature sensor is installed in the catalytic device to issue an alarm when the temperature rises above a predetermined temperature. As seen in eO-27756, when the catalyst temperature stops below a predetermined value during deceleration fuel cut based on the signal from the catalyst temperature sensor, fuel supply is started to improve the purification performance of the catalyst. Techniques are known in the art.
(発明が解決しようとする課題)
しかして、上記のような排気系に介装した触媒装置にお
いて、長期間の使用後に触媒が熱劣化などによって反応
浄化性能が低下した場合には、排気ガス量が増大したと
きに浄化しきれない有害成分がそのまま放出される問題
を有する。(Problem to be solved by the invention) However, in the catalyst device installed in the exhaust system as described above, if the reaction purification performance of the catalyst decreases due to thermal deterioration after long-term use, the amount of exhaust gas will decrease. There is a problem that when the amount of water increases, harmful components that cannot be completely purified are released as they are.
上記のような触媒の劣化状態を簡易に検出することは困
難であり、アイドル時のような低吸気量域では排気ガス
量も少なく十分な浄化性能が得られて、この様な状態の
排気ガス成分の検出では実際の触媒劣化程度が判定でき
ず、排気ガス量が増大した際の浄化能力の不足によって
エミッション性が低下する恐れがある。It is difficult to easily detect the deterioration state of the catalyst as described above, and in the low intake air volume range such as during idling, the amount of exhaust gas is small and sufficient purification performance is obtained. The actual degree of catalyst deterioration cannot be determined by detecting the components, and there is a risk that emissions performance will decrease due to insufficient purification ability when the amount of exhaust gas increases.
また、排気ガスの成分検出で触媒の浄化性能を判定する
には、専用の測定装置を必要とし定期点検時などに行う
しか機会がなく、触媒の劣化が急速に進行した際などに
は浄化性能か不足する状態で長期間運転されることにな
る問題を有する。Additionally, in order to judge the purification performance of a catalyst by detecting the components of exhaust gas, a special measuring device is required, and this can only be done during periodic inspections. This has the problem of being operated for a long period of time without sufficient fuel.
そこで本発明は上記事情に鑑み、触媒の劣化状態を簡易
でかつ正確に検出判定できるようにしたエンジンの制御
装置を提供することを目的とするものである。SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide an engine control device that can easily and accurately detect and determine the deterioration state of a catalyst.
(課題を解決するための手段)
上記目的を達成するため本発明の制御装置は、第1図に
基本構成を示すように、エンジンEの吸気通路Aには供
給空燃比を変更可能な空燃比調整手段Bを設け、また、
排気通路Cには排気ガス浄化用の触媒装置りが配設され
ている。そして、前記エンジンEの定常運転状態を検出
する運転状態判定手段Fと、触媒温度を検出する触媒温
度検出手段Gとが設置されている。(Means for Solving the Problems) In order to achieve the above object, the control device of the present invention has an air-fuel ratio that can change the supplied air-fuel ratio, as shown in the basic configuration in FIG. An adjustment means B is provided, and
A catalyst device for purifying exhaust gas is disposed in the exhaust passage C. Further, operating state determining means F for detecting the steady operating state of the engine E and catalyst temperature detecting means G for detecting the catalyst temperature are installed.
一方、前記運転状態判定手段Fおよび触媒温度検出手段
Gの信号を受け、定常運転時に検出した触媒温度と該定
常運転時に空燃比調整手段Bによって空燃比をリッチ側
に補正した後に検出した触媒温度とから温度上昇勾配を
算出する温度勾配算出手段Hを設け、該温度勾配算出手
段Hで算出した温度上昇勾配が所定の許容範囲内にない
際には触媒の劣化と判定する劣化判定手段Jを設けて構
成し、この劣化判定手段Jからは劣化判定時に必要に応
じて警報の発生、吸気量制限などを指令するものである
。On the other hand, upon receiving the signals from the operating state determining means F and the catalyst temperature detecting means G, the catalyst temperature detected during steady operation and the catalyst temperature detected after the air fuel ratio is corrected to the rich side by the air fuel ratio adjusting means B during the steady operation. A temperature gradient calculation means H is provided for calculating a temperature rise gradient from The deterioration determining means J issues commands to issue an alarm, limit the amount of intake air, etc. as necessary when determining deterioration.
(作用)
上記のようなエンジンの制御装置では、運転状態の安定
している定常状態に、空燃比をリッチ側に補正して触媒
装置に対する未燃焼成分の導入量を増大することで触媒
装置の浄化反応か促進されて該触媒の温度が上昇するこ
とを利用し、また、この温度上昇は触媒の劣化程度にも
関連し、触媒の劣化が進んだものでは、浄化反応か鈍く
温度上昇が低いことから、空燃比のリッチ補正の前後の
触媒温度を測定して温度上昇勾配を算出し、この温度上
昇勾配を所定の許容範囲と比較して外れている場合には
触媒劣化と判定することで、実際の触媒状態を正確かつ
簡易に判定して、警報を発したり吸気量が増大しないよ
うに制限することで有害成分の排出を抑制するとともに
、触媒の監視頻度を高めて触媒装置の交換を適正な時期
に行って良好な排気浄化性能を維持することを可能とし
ている。(Function) In the above-mentioned engine control device, when the operating condition is stable and steady, the air-fuel ratio is corrected to the rich side to increase the amount of unburned components introduced into the catalyst device, thereby controlling the catalyst device. It utilizes the fact that the temperature of the catalyst increases as the purification reaction is promoted, and this temperature increase is also related to the degree of deterioration of the catalyst. Therefore, by measuring the catalyst temperature before and after the rich correction of the air-fuel ratio, calculating the temperature increase slope, and comparing this temperature increase slope with a predetermined tolerance range, it is determined that the catalyst has deteriorated. , accurately and easily determines the actual state of the catalyst, issues an alarm, and limits the amount of intake air to prevent it from increasing, thereby suppressing the emission of harmful components, and increasing the frequency of catalyst monitoring to encourage replacement of the catalyst device. This makes it possible to maintain good exhaust purification performance by performing the cleaning at the appropriate time.
(実施例) 以下、図面に沿って本発明の詳細な説明する。(Example) The present invention will be described in detail below with reference to the drawings.
第2図は一実施例のロータリピストンエンジンの全体構
成図である。FIG. 2 is an overall configuration diagram of a rotary piston engine according to an embodiment.
エンジン本体1は、ケーシング2内をロータ3が遊星回
転運動し、その作動室4に吸気ポート5から吸気を供給
し、圧縮爆発した後、排気ポート6から排気ガスを排出
するものである。上記吸気ポート5に接続する吸気通路
7には、上流側からエアクリーナ8、エアフローセンサ
9、スロットルバルブ10が配設され、下流部分にはイ
ンジェクタ11が介装されている。また、排気ポート6
に接続される排気通路13には、02センサ14の下流
側に前段触媒装置15およびメイン触媒装置16か直列
に配設されて排気ガスのHC,Co。In the engine body 1, a rotor 3 rotates planetarily within a casing 2, and intake air is supplied to a working chamber 4 from an intake port 5, and after compression and explosion, exhaust gas is discharged from an exhaust port 6. In the intake passage 7 connected to the intake port 5, an air cleaner 8, an air flow sensor 9, and a throttle valve 10 are arranged from the upstream side, and an injector 11 is interposed in the downstream part. Also, exhaust port 6
In the exhaust passage 13 connected to the 02 sensor 14, a pre-catalyst device 15 and a main catalyst device 16 are arranged in series on the downstream side of the 02 sensor 14 to remove HC and Co from the exhaust gas.
NOxなどの有害成分の反応浄化が行われる。Reactive purification of harmful components such as NOx is performed.
そして、前記メイン触媒装置16には触媒温度センサ1
7が配設されて触媒温度を検出するようにしている。こ
の触媒温度センサ17の信号がコントロールユニット2
0に入力され、定常運転時に検出した触媒温度と、該定
常運転時にインジェクタ11からの燃料噴射量を所定量
増量して空燃比をリッチ側に補正した後に検出した触媒
温度とから温度上昇勾配を算出し、この温度上昇勾配が
所定の許容範囲内にあるか否かによって触媒の劣化状態
が判定される。The main catalyst device 16 includes a catalyst temperature sensor 1.
7 is arranged to detect the catalyst temperature. The signal from this catalyst temperature sensor 17 is transmitted to the control unit 2.
0, the temperature increase gradient is calculated from the catalyst temperature detected during steady operation and the catalyst temperature detected after the fuel injection amount from the injector 11 is increased by a predetermined amount and the air-fuel ratio is corrected to the rich side during the steady operation. The deterioration state of the catalyst is determined based on whether the temperature increase gradient is within a predetermined allowable range.
また、前記コントロールユニット20に接続されて、運
転者に触媒劣化を警報する警報ランプ21がインストル
メントパネル22に設置され、また、エンジンの吸気通
路7のスロットルバルブ10の最大開度を規制するスロ
ットルリミッタ23が付設され、このスロットルリミッ
タ23にコントロールユニット20から信号が出力され
るように構成されている。Further, an alarm lamp 21 connected to the control unit 20 to warn the driver of catalyst deterioration is installed on the instrument panel 22, and a throttle lamp 21 that regulates the maximum opening of the throttle valve 10 in the intake passage 7 of the engine is installed. A limiter 23 is attached, and a signal is output from the control unit 20 to the throttle limiter 23.
そして、前記コントロールユニット20には、エンジン
の運転状態を検出するために、エアフローセンサ9から
の吸気量信号、回転センサ24からのエンジン回転数信
号、スロットル開度センサ25からのスロットル開度信
号、02センサ14からの空燃比信号等がそれぞれ入力
される。The control unit 20 includes an intake air amount signal from the air flow sensor 9, an engine rotation speed signal from the rotation sensor 24, a throttle opening signal from the throttle opening sensor 25, and a throttle opening signal from the throttle opening sensor 25, in order to detect the operating state of the engine. The air-fuel ratio signal etc. from the 02 sensor 14 are respectively input.
前記コントロールユニット20による触媒劣化判定の処
理を第3図のフローチャートに沿って説明する。制御ス
タート後、ステップS1で空燃比のフィードバック実行
条件が成立しているか否かを判定する。この判定かYE
Sで、高負荷領域などの燃料増量もしくは燃料カットが
行われていないフィードバック領域にある場合には、ス
テップS2で運転状態が安定している定常状態か否かを
スロットル開度の変化などから判定する。そして、定常
状態にある場合には、ステップS3で触媒温度が劣化判
定に適する設定温度範囲内にあるか否かを判定する。The process of determining catalyst deterioration by the control unit 20 will be explained with reference to the flowchart in FIG. 3. After the control is started, it is determined in step S1 whether air-fuel ratio feedback execution conditions are satisfied. Is this the verdict?
If S is in a feedback region where fuel increase or fuel cut is not performed, such as a high load region, it is determined in step S2 whether the operating state is in a stable steady state based on changes in throttle opening, etc. do. If the catalyst is in a steady state, it is determined in step S3 whether the catalyst temperature is within a set temperature range suitable for determining deterioration.
上記ステップS3の判定かYESで触媒劣化判定条件が
成立すると、まず、ステップS4で触媒温度を測定し第
1検出値Taとして記憶する。続いて、ステップS5で
空燃比を所定量リッチ側に補正し、このリッチ補正から
所定時間定常状態か継続しているか否かをステップS6
で判定する。If the catalyst deterioration determination condition is satisfied in step S3 (YES), first, in step S4, the catalyst temperature is measured and stored as the first detected value Ta. Subsequently, in step S5, the air-fuel ratio is corrected to the rich side by a predetermined amount, and it is determined in step S6 whether or not the steady state continues for a predetermined period of time after this rich correction.
Judge by.
このステップS6の判定かYESで所定時間定常状態で
あった場合には、ステップS7でリッチ補正後の触媒温
度を測定し第2検出値Tbとして記憶する。If the determination in step S6 is YES and the steady state has been maintained for a predetermined period of time, the catalyst temperature after rich correction is measured in step S7 and stored as the second detected value Tb.
次に、ステップS8で温度上昇勾配を算出するものであ
るが、この温度上昇勾配はリッチ補正前後の第1および
第2検出値Ta、Tbの温度差を両者の測定時間差(所
定時間)で割って算出される。そして、このステップS
8で求めた温度上昇勾配を、ステップS9で許容範囲の
設定値と照合し、この温度勾配が許容範囲にあるか否か
をステップS1.0で判定する。Next, in step S8, the temperature increase gradient is calculated by dividing the temperature difference between the first and second detected values Ta, Tb before and after the rich correction by the measurement time difference (predetermined time) between the two. Calculated by And this step S
The temperature increase gradient obtained in step 8 is compared with the set value of the allowable range in step S9, and it is determined in step S1.0 whether this temperature gradient is within the allowable range.
そして、許容範囲内にあるとき(YES)には、ステッ
プSllで空燃比を通常制御に戻す一方、許容範囲から
外れている場合(No)には、ステップS12で触媒劣
化であると判断し、ステップS13で警報ランプ21に
オン信号を出力して点灯し警報を発すると共に、ステッ
プS14でスロットルリミッタ23に駆動信号を出力し
てスロットルバルブ10の最大開度を規制して吸気量を
制限し、排気ガス量の増大を抑制する。If it is within the allowable range (YES), the air-fuel ratio is returned to normal control in step Sll, while if it is out of the allowable range (No), it is determined that the catalyst has deteriorated in step S12. In step S13, an on signal is output to the alarm lamp 21 to light it up and issue an alarm, and in step S14, a drive signal is output to the throttle limiter 23 to regulate the maximum opening of the throttle valve 10 and limit the intake air amount. Suppress the increase in exhaust gas volume.
また、前記ステップS6の判定がNoで、空燃比をリッ
チ補正した後の定常運転が所定時間継続しなかった場合
には、ステップS15で前記ステップS4で測定した触
媒温度の第1検出値Taをキャンセルし、ステップSl
lで空燃比を通常制御に戻してから、前記ステップS1
〜S3の条件成立を待つ。Further, if the determination in step S6 is No and the steady operation after richly correcting the air-fuel ratio does not continue for a predetermined period of time, the first detected value Ta of the catalyst temperature measured in step S4 is determined in step S15. Cancel and step Sl
After returning the air-fuel ratio to normal control at step S1,
~Wait for the condition in S3 to be met.
なお、触媒温度の上昇勾配についての許容範囲の設定例
を第4図に示し、リッチ補正後の時間と触媒温度に応じ
て設定されている。そして、劣化した触媒においては浄
化反応か緩慢で温度上昇が小さくなるものである。FIG. 4 shows an example of setting the allowable range for the rising slope of the catalyst temperature, which is set according to the time after rich correction and the catalyst temperature. In a deteriorated catalyst, the purification reaction is slow and the temperature rise is small.
上記実施例によれば、触媒劣化判定に適した定常運転条
件が成立すると、空燃比をリッチ補正する前後の触媒温
度を検出して、経過時間との関係で温度上昇勾配を算出
し、許容範囲と照合して良好な浄化反応が行われていな
い場合には、触媒か劣化していると判断して警報を発す
ると共に吸気量を制限して、多量の排気ガスが触媒装置
に流入しないように規制(−で浄化されない有害成分の
排出を防止するようにしている。According to the above embodiment, when steady-state operating conditions suitable for determining catalyst deterioration are established, the catalyst temperature before and after rich correction of the air-fuel ratio is detected, the temperature increase gradient is calculated in relation to the elapsed time, and the permissible range is determined. If a good purification reaction is not taking place, it is determined that the catalyst has deteriorated, and an alarm is issued and the amount of intake air is restricted to prevent a large amount of exhaust gas from flowing into the catalyst device. Regulations (-) are aimed at preventing the discharge of harmful components that cannot be purified.
(発明の効果)
上記のような本発明によれば、定常運転時に検出した触
媒温度と該定常運転時に空燃比をリッチ側に補正した後
に検出した触媒温度とから温度上昇勾配を温度勾配算出
手段で算出し、この温度上昇勾配が所定の許容範囲内に
ない際には触媒の劣化と判定する劣化判定手段とを備え
たことにより、実際の触媒状態を正確かつ簡易に判定し
て、警報を発したり吸気量が増大しないように制限する
ことで有害成分の排出を抑制するとともに、触媒の監視
頻度を高めて触媒劣化が急速に進行した場合などでも早
期に劣化判定を行って触媒交換等によって良好な排気浄
化性能を維持し、大気汚染を防止することかできるもの
である。(Effects of the Invention) According to the present invention as described above, the temperature gradient calculation means calculates the temperature increase gradient from the catalyst temperature detected during steady operation and the catalyst temperature detected after correcting the air-fuel ratio to the rich side during the steady operation. By being equipped with a deterioration determination means that determines that the catalyst has deteriorated when the temperature increase gradient is not within a predetermined tolerance range, the actual catalyst condition can be accurately and easily determined and an alarm can be issued. In addition to suppressing the emission of harmful components by restricting the amount of air emitted or intake air from increasing, the frequency of monitoring the catalyst is increased so that even if catalyst deterioration progresses rapidly, it can be determined early and the catalyst can be replaced. It is possible to maintain good exhaust purification performance and prevent air pollution.
第1図は本発明の基本構成を示す概略構成図、第2図は
具体例のエンジンの制御装置の全体構成図、
第3図はコントローラの処理を説明するだめのフローチ
ャート図、
第4図は触媒温度の上昇勾配についての許容範囲の設定
例を示す特性図である。
E、1・・・・・・エンジン、A、7・・・・・・吸気
通路、B・・・・空燃比調整手段、C213・・・・・
・排気通路、D16・・・・・・触媒装置、F・・・・
・・運転状態判定手段、G・・・・・・触媒温度検出手
段、H・・・・・・温度勾配算出手段、J・・・・・・
劣化判定手段、11・・・・・・インジェクタ、17・
・・・・・触媒温度センサ、20・・・・・・コントロ
ールユニット、21・・・・・・警報ランプ、23・・
・・・スロットルリミッタ。
第2図
第1図FIG. 1 is a schematic configuration diagram showing the basic configuration of the present invention, FIG. 2 is an overall configuration diagram of a concrete example of an engine control device, FIG. 3 is a flowchart diagram for explaining the processing of the controller, and FIG. FIG. 3 is a characteristic diagram illustrating an example of setting an allowable range for an increase gradient of catalyst temperature. E, 1...Engine, A, 7...Intake passage, B...Air-fuel ratio adjustment means, C213...
・Exhaust passage, D16... Catalyst device, F...
...Operating state determination means, G...Catalyst temperature detection means, H...Temperature gradient calculation means, J...
Deterioration determination means, 11...Injector, 17.
... Catalyst temperature sensor, 20 ... Control unit, 21 ... Alarm lamp, 23 ...
...Throttle limiter. Figure 2 Figure 1
Claims (3)
手段と、触媒温度を検出する触媒温度検出手段とを備え
たエンジンの制御装置において、定常運転時に検出した
触媒温度と該定常運転時に空燃比をリッチ側に補正した
後に検出した触媒温度とから温度上昇勾配を算出する温
度勾配算出手段と、該温度勾配算出手段で算出した温度
上昇勾配が所定の許容範囲内にない際には触媒の劣化と
判定する劣化判定手段とを備えたことを特徴とするエン
ジンの制御装置。(1) In an engine control device equipped with an operating state determining means for detecting the steady operating state of the engine and a catalyst temperature detecting means for detecting the catalyst temperature, the catalyst temperature detected during steady operating and the air-fuel ratio during the steady operating a temperature gradient calculation means for calculating a temperature rise gradient from the detected catalyst temperature after correcting the temperature to the rich side; A control device for an engine, comprising: deterioration determining means for determining.
場合に、警報を発することを特徴とする請求項1記載の
エンジンの制御装置。(2) The engine control device according to claim 1, wherein an alarm is issued when the deterioration determining means determines that the catalyst has deteriorated.
場合に、吸気量を所定量以下に制限することを特徴とす
る請求項1記載のエンジンの制御装置。(3) The engine control device according to claim 1, wherein the intake air amount is limited to a predetermined amount or less when the deterioration of the catalyst is determined by the deterioration determining means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2171888A JPH0460106A (en) | 1990-06-29 | 1990-06-29 | Control device of engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2171888A JPH0460106A (en) | 1990-06-29 | 1990-06-29 | Control device of engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0460106A true JPH0460106A (en) | 1992-02-26 |
Family
ID=15931663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2171888A Pending JPH0460106A (en) | 1990-06-29 | 1990-06-29 | Control device of engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0460106A (en) |
Cited By (19)
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WO1994020738A1 (en) * | 1993-03-01 | 1994-09-15 | Ford Motor Company Limited | Method of determining the efficiency of a catalytic converter |
WO1994021902A1 (en) * | 1993-03-18 | 1994-09-29 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Process and device for monitoring the operation of a catalytic converter |
FR2710105A1 (en) * | 1993-09-13 | 1995-03-24 | Bosch Gmbh Robert | Method for monitoring the starting behavior of a catalyst system of a motor vehicle. |
WO1995017588A1 (en) * | 1993-12-21 | 1995-06-29 | Siemens Aktiengesellschaft | Method for testing the convertability of a catalytic converter |
US5610844A (en) * | 1992-08-17 | 1997-03-11 | Emitec Gesellschaft Fuer Emissionstechnologie | Method of monitoring the operation of a catalytic converter |
EP0756071A3 (en) * | 1995-07-25 | 1997-11-26 | Toyota Jidosha Kabushiki Kaisha | A device for determining an abnormal degree of deterioration of a catalyst |
EP0609527B1 (en) * | 1993-02-02 | 1998-02-25 | Dr.Ing.h.c. F. Porsche Aktiengesellschaft | Method for examining the performance of exhaust gas catalyzer |
EP0793770B1 (en) * | 1994-11-22 | 2000-07-19 | Heraeus Electro-Nite International N.V. | Device for monitoring the operatability of catalytic converters |
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US6237330B1 (en) * | 1998-04-15 | 2001-05-29 | Nissan Motor Co., Ltd. | Exhaust purification device for internal combustion engine |
WO2001049989A1 (en) * | 1999-12-31 | 2001-07-12 | Robert Bosch Gmbh | Method for operating an internal combustion engine, especially of a motor vehicle |
JP2001263048A (en) * | 2000-03-16 | 2001-09-26 | Mazda Motor Corp | Exhaust emission control device for engine |
JP2003519323A (en) * | 1999-12-31 | 2003-06-17 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Especially the operation method of the internal combustion engine of the automobile |
EP1995422A1 (en) * | 2007-05-21 | 2008-11-26 | Peugeot Citroën Automobiles Société Anonyme | Method and device for controlling a diesel engine depollution catalyst |
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1990
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EP0609527B1 (en) * | 1993-02-02 | 1998-02-25 | Dr.Ing.h.c. F. Porsche Aktiengesellschaft | Method for examining the performance of exhaust gas catalyzer |
WO1994020738A1 (en) * | 1993-03-01 | 1994-09-15 | Ford Motor Company Limited | Method of determining the efficiency of a catalytic converter |
US5560200A (en) * | 1993-03-18 | 1996-10-01 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Method and apparatus for functional monitoring of a catalytic converter |
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FR2710105A1 (en) * | 1993-09-13 | 1995-03-24 | Bosch Gmbh Robert | Method for monitoring the starting behavior of a catalyst system of a motor vehicle. |
US5715676A (en) * | 1993-09-13 | 1998-02-10 | Robert Bosch Gmbh | Method and apparatus for monitoring the starting behavior of a catalytic conversion system in an automotive vehicle |
WO1995017588A1 (en) * | 1993-12-21 | 1995-06-29 | Siemens Aktiengesellschaft | Method for testing the convertability of a catalytic converter |
EP0793770B1 (en) * | 1994-11-22 | 2000-07-19 | Heraeus Electro-Nite International N.V. | Device for monitoring the operatability of catalytic converters |
US5752382A (en) * | 1995-07-25 | 1998-05-19 | Toyota Jidosha Kabushiki Kaisha | Device for determining an abnormal degree of deterioration of a catalyst |
EP0756071A3 (en) * | 1995-07-25 | 1997-11-26 | Toyota Jidosha Kabushiki Kaisha | A device for determining an abnormal degree of deterioration of a catalyst |
US6237330B1 (en) * | 1998-04-15 | 2001-05-29 | Nissan Motor Co., Ltd. | Exhaust purification device for internal combustion engine |
EP1052385A2 (en) * | 1999-04-29 | 2000-11-15 | Siemens Aktiengesellschaft | Method of diagnosing a catalyst having hydrocarbon oxidizing properties |
EP1052385A3 (en) * | 1999-04-29 | 2001-10-17 | Siemens Aktiengesellschaft | Method of diagnosing a catalyst having hydrocarbon oxidizing properties |
JP4938950B2 (en) * | 1999-12-31 | 2012-05-23 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | In particular, a method for operating an internal combustion engine of an automobile |
WO2001049989A1 (en) * | 1999-12-31 | 2001-07-12 | Robert Bosch Gmbh | Method for operating an internal combustion engine, especially of a motor vehicle |
JP2003519323A (en) * | 1999-12-31 | 2003-06-17 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Especially the operation method of the internal combustion engine of the automobile |
JP2001263048A (en) * | 2000-03-16 | 2001-09-26 | Mazda Motor Corp | Exhaust emission control device for engine |
JP4631123B2 (en) * | 2000-03-16 | 2011-02-16 | マツダ株式会社 | Engine exhaust purification system |
EP1154131A3 (en) * | 2000-03-16 | 2003-11-26 | Mazda Motor Corporation | Exhaust gas purifying device for internal combustion engine |
FR2916478A1 (en) * | 2007-05-21 | 2008-11-28 | Peugeot Citroen Automobiles Sa | METHOD AND DEVICE FOR MONITORING A DEPOLLUTION CATALYST OF A DIESEL ENGINE |
EP1995422A1 (en) * | 2007-05-21 | 2008-11-26 | Peugeot Citroën Automobiles Société Anonyme | Method and device for controlling a diesel engine depollution catalyst |
JP2008303742A (en) * | 2007-06-05 | 2008-12-18 | Toyota Motor Corp | Device for diagnosing deterioration of catalyst |
WO2008150014A1 (en) | 2007-06-05 | 2008-12-11 | Toyota Jidosha Kabushiki Kaisha | Catalyst degradation diagnostic device |
US8302378B2 (en) | 2007-06-05 | 2012-11-06 | Toyota Jidosha Kabushiki Kaisha | Degradation diagnosis device for catalyst |
WO2009027505A1 (en) * | 2007-08-31 | 2009-03-05 | Umicore Ag & Co. Kg | Method for verifying the aging condition of a catalytic converter on board a vehicle |
EP2031207A1 (en) * | 2007-08-31 | 2009-03-04 | Umicore AG & Co. KG | Method for testing the aging state of a catalyst on board a vehicle |
US8276438B2 (en) | 2007-08-31 | 2012-10-02 | Umicore Ag & Co. Kg | Method for verifying the aging condition of a catalytic converter on board a vehicle |
CN102290240A (en) * | 2010-05-07 | 2011-12-21 | Tdk株式会社 | Method for manufacturing electronic component |
WO2013110873A1 (en) | 2012-01-26 | 2013-08-01 | Peugeot Citroen Automobiles Sa | Method for the thermal protection of the components of the exhaust line of a heat engine |
US11359529B2 (en) * | 2020-03-02 | 2022-06-14 | GM Global Technology Operations LLC | Monitoring of diesel oxidation catalyst in aftertreatment assembly |
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