JP3147632B2 - Catalyst deterioration detection device for catalytic converter - Google Patents
Catalyst deterioration detection device for catalytic converterInfo
- Publication number
- JP3147632B2 JP3147632B2 JP32480393A JP32480393A JP3147632B2 JP 3147632 B2 JP3147632 B2 JP 3147632B2 JP 32480393 A JP32480393 A JP 32480393A JP 32480393 A JP32480393 A JP 32480393A JP 3147632 B2 JP3147632 B2 JP 3147632B2
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- temperature
- deterioration
- catalytic converter
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Of Engines (AREA)
- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、エンジンの排気ガス
を浄化する触媒コンバータの触媒劣化検出装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst deterioration detecting device for a catalytic converter for purifying exhaust gas of an engine.
【0002】[0002]
【従来の技術】近年、エンジンに対する有害な排気ガス
の高レベルの低減が要求されており、その排気ガスを浄
化するものとして触媒コンバータが知られているが、こ
の触媒が劣化してくると、浄化機能が次第に低下するこ
とになる。2. Description of the Related Art In recent years, a high level of reduction of harmful exhaust gas to an engine has been demanded, and a catalytic converter is known as a device for purifying the exhaust gas. The purification function will gradually decrease.
【0003】このため、触媒の劣化検出装置が提案され
ており、これは、触媒コンバータの入口、触媒の内部等
の2カ所に温度センサを取付け、その2点間の温度差を
劣化がないときの状態と比べて、劣化があるかどうかを
判断するようになっており、劣化があるときに警告灯等
を点灯して運転者に知らせるようになっている(特開平
2ー27109号公報等参照)。[0003] For this reason, a catalyst deterioration detecting device has been proposed, in which a temperature sensor is mounted at two places, such as an inlet of a catalytic converter and inside a catalyst, and a temperature difference between the two points is not deteriorated. It is determined whether or not there is any deterioration as compared with the state described above. When there is deterioration, a warning light or the like is lit to notify the driver (Japanese Patent Laid-Open No. 2-27109, etc.). reference).
【0004】[0004]
【発明が解決しようとする課題】しかしながら、この場
合温度センサの取付箇所が異なると、排気ガスや酸化雰
囲気にさらされる環境が異なるため、長期間使用してい
る間に温度センサの劣化状態が異なってくる。これは、
触媒の劣化判断に影響を及ぼす。However, in this case, if the temperature sensor is installed at a different location, the environment exposed to the exhaust gas or the oxidizing atmosphere is different, so that the deterioration state of the temperature sensor during long-term use is different. Come. this is,
Influences catalyst deterioration judgment.
【0005】一方、触媒内部の2カ所に温度センサを取
付ける場合、触媒の長さが比較的短いときは、ガス流に
対して上下流に配置するのが難しい。On the other hand, when temperature sensors are mounted at two locations inside the catalyst, when the length of the catalyst is relatively short, it is difficult to arrange the temperature sensors upstream and downstream with respect to the gas flow.
【0006】この発明は、このような問題点を解決でき
る触媒劣化検出装置を提供することを目的としている。An object of the present invention is to provide a catalyst deterioration detecting device which can solve such problems.
【0007】[0007]
【課題を解決するための手段】第1の発明は、図1に示
すようにエンジンの排気ガスを浄化する触媒コンバータ
の触媒の劣化を検出する装置において、触媒中心部の温
度を検出する第1の温度センサ1と、前記第1の温度セ
ンサ1に対して触媒の同一横断面上に配置され、触媒周
辺部の温度を検出する第2の温度センサ2と、両温度セ
ンサ1、2の検出値を比較して或る時点の温度差が所定
値以上のとき劣化と判断する判定手段3とを設ける。According to a first aspect of the present invention, there is provided an apparatus for detecting deterioration of a catalyst of a catalytic converter for purifying exhaust gas of an engine as shown in FIG. a temperature sensor 1 of the first temperature cell
A second temperature sensor 2, which is disposed on the same cross section of the catalyst with respect to the sensor 1 and detects the temperature around the catalyst, is compared with the detection values of the two temperature sensors 1, 2 to determine the temperature difference at a certain point in time. And determining means 3 for determining deterioration when the value is equal to or more than a predetermined value.
【0008】第2の発明は、前記或る時点を、エンジン
の始動後所定時間を経過した時点とする。According to a second aspect of the present invention, the certain point in time is a point in time when a predetermined time has elapsed after the start of the engine.
【0009】第3の発明は、前記或る時点を、定常運転
時とする。In a third aspect of the present invention, the certain time point is a time of a steady operation.
【0010】第4の発明は、前記第1、第2の温度セン
サが1つの支持体に一体に組込まれる。[0010] In a fourth aspect, the first and second temperature sensors are provided.
The sensors are integrated into one support .
【0011】[0011]
【作用】触媒の温度は、流入した排気の触媒での反応熱
によって中心部で高く、また排気の流入初期には周辺部
の温度の立ち上がりが遅れるが、劣化が進行するにした
がい、周辺部の温度の立ち上がりが遅くなり、また周辺
部と中心部との温度差が拡がる。The temperature of the catalyst is high in the center due to the reaction heat of the inflowing exhaust gas at the catalyst, and the rise of the temperature in the peripheral portion is delayed in the initial stage of the inflow of the exhaust gas. The temperature rises slowly, and the temperature difference between the peripheral part and the central part increases.
【0012】したがって、第1の発明では、第1の温度
センサによる触媒中心部の温度と、第2の温度センサに
よる触媒周辺部の温度との差によって、触媒の劣化が的
確に判定される。また、温度センサの劣化のバラツキが
抑えられる。Therefore, in the first invention, the deterioration of the catalyst is accurately determined based on the difference between the temperature of the central portion of the catalyst detected by the first temperature sensor and the temperature of the peripheral portion of the catalyst detected by the second temperature sensor. Further, variation in deterioration of the temperature sensor can be suppressed.
【0013】第2の発明では、エンジンの始動後所定時
間を経過した時点での触媒中心部と触媒周辺部の温度差
を比較することで、触媒周辺部の温度の立ち上がり状態
を基に触媒の劣化判定を的確に行える。In the second invention, the temperature difference between the central portion of the catalyst and the peripheral portion of the catalyst when a predetermined time has elapsed after the start of the engine is compared. Deterioration determination can be performed accurately.
【0014】第3の発明では、定常運転時での触媒中心
部と触媒周辺部の温度差を比較することで、安定した状
態で触媒の劣化判定を的確に行える。In the third aspect of the invention, the deterioration of the catalyst can be accurately determined in a stable state by comparing the temperature difference between the central portion of the catalyst and the peripheral portion of the catalyst during steady operation.
【0015】第4の発明では、構造が簡素化し、取付け
が容易になる。According to the fourth aspect of the invention, the structure is simplified and the mounting becomes easy.
【0016】[0016]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【0017】図2のように触媒コンバータ10は、内部
に触媒(三元触媒)11が収納されると共に、エンジン
の排気ガスを導く排気管(図示しない)の途中に設置さ
れる。排気ガスは図中矢印の方向に流れるものである。As shown in FIG. 2, the catalytic converter 10 accommodates a catalyst (three-way catalyst) 11 therein and is installed in an exhaust pipe (not shown) for guiding exhaust gas of the engine. The exhaust gas flows in the direction of the arrow in the figure.
【0018】触媒11としては、モノリス触媒が用いら
れ、例えばアルミナのハニカム形が採用されている。触
媒11の周囲にはインシュレータ12が装着されてい
る。As the catalyst 11, a monolith catalyst is used, and for example, a honeycomb type of alumina is employed. An insulator 12 is mounted around the catalyst 11.
【0019】この触媒11に触媒11内部の温度を検出
する第1、第2の温度センサ13,14が配設される。The catalyst 11 has first and second temperature sensors 13 and 14 for detecting the temperature inside the catalyst 11.
【0020】温度センサ13,14は、図3のように金
属抵抗体あるいはサーミスタからなる熱感知部15,1
6がセラミックからなるセンサ支持体17に一体に組込
まれて、コンバータハウジング18の取付孔から触媒1
1内に差し込まれて固定される。As shown in FIG. 3, the temperature sensors 13 and 14 are heat sensing units 15 and 1 made of a metal resistor or a thermistor.
6 are integrally incorporated into a sensor support 17 made of ceramic, and the catalyst 1 is inserted through a mounting hole of the converter housing 18.
It is inserted into 1 and fixed.
【0021】第1の温度センサ13の熱感知部15は、
触媒11の中心部分の温度を検出するようにセンサ支持
体17の先端側に組込まれ、第2の温度センサ14の熱
感知部16は、触媒11の周辺部分の温度を検出するよ
うにセンサ支持体17の途中に組込まれる。The heat sensing portion 15 of the first temperature sensor 13
The heat sensing unit 16 of the second temperature sensor 14 is mounted on the front end side of the sensor support 17 so as to detect the temperature of the central portion of the catalyst 11. Assembled in the middle of body 17.
【0022】このセンサ支持体17は、温度センサ1
3,14が触媒11のガス入口端より所定値以上後流の
同一横断面上に配置されるように取付けられる。The sensor support 17 is provided with the temperature sensor 1
3 and 14 are mounted so as to be arranged on the same cross section downstream from the gas inlet end of the catalyst 11 by a predetermined value or more.
【0023】なお、図4には熱電対を用いた熱感知部2
0,21をセンサ支持体22に組込んだ例を示す。FIG. 4 shows a heat sensing unit 2 using a thermocouple.
An example in which 0 and 21 are incorporated in the sensor support 22 is shown.
【0024】これら第1、第2の温度センサ13,14
の検出信号は、それぞれ増幅器23,24を通して判定
回路25に送られる。The first and second temperature sensors 13 and 14
Are sent to the determination circuit 25 through the amplifiers 23 and 24, respectively.
【0025】判定回路25には、エンジンの負荷、回転
数、冷却水温等の各運転条件信号およびイグニッション
スイッチ26の信号が入力されている。The determination circuit 25 receives various operating condition signals such as engine load, rotation speed, cooling water temperature, and the like, and a signal from an ignition switch 26.
【0026】これらの信号に基づき、判定回路25によ
って所定の時期に第1、第2の温度センサ13,14に
よる温度検出が行われ、これらの検出値に基づき触媒1
1の劣化判断が行われる。また、劣化と判定された場
合、運転席等に設けられる警告ランプ27に点灯信号が
出力される。Based on these signals, the temperature is detected by the first and second temperature sensors 13 and 14 at a predetermined time by the determination circuit 25 at a predetermined time, and the catalyst 1 is detected based on these detected values.
1 is determined. When it is determined that the battery is deteriorated, a lighting signal is output to a warning lamp 27 provided in a driver's seat or the like.
【0027】これを、図5のフローチャートに基づいて
説明する。This will be described with reference to the flowchart of FIG.
【0028】まず、ステップ1でエンジンのイグニッシ
ョンスイッチ26がオンされ、エンジンが始動されたこ
とを検知すると、ステップ2でタイマをスタートする。First, in step 1, when the ignition switch 26 of the engine is turned on and it is detected that the engine has been started, the timer is started in step 2.
【0029】このスタート後、ステップ3で規定時間
(例えば数十秒)TMが経過すると、ステップ4で第
1、第2の温度センサ13,14の検出信号を読み込
み、内部(触媒中心部)温度bと、外側(触媒周辺部)
温度aを計測する。After the start, when a specified time (for example, several tens of seconds) TM elapses in step 3, the detection signals of the first and second temperature sensors 13 and 14 are read in step 4, and the internal (catalyst center) temperature is read. b and outside (periphery of catalyst)
The temperature a is measured.
【0030】次に、ステップ5でその内側温度bと外側
温度aの差ΔTを計算し、ステップ6でその差ΔTを劣
化判定規定値(例えば40〜50℃)と比較する。Next, in step 5, the difference ΔT between the inside temperature b and the outside temperature a is calculated, and in step 6, the difference ΔT is compared with a deterioration determination specified value (for example, 40 to 50 ° C.).
【0031】そして、その差ΔTが劣化判定規定値より
大きければ、触媒11が劣化していると判定し、ステッ
プ7で警告ランプ27を点灯する。If the difference ΔT is larger than the specified value for determining deterioration, it is determined that the catalyst 11 has deteriorated, and the warning lamp 27 is turned on in step 7.
【0032】ここで、エンジンの始動直後の触媒11の
横断面の温度状態を示すと、触媒11が新しいときは、
図6、図7のように流入した排気の反応熱によって周辺
部に囲われる内側の温度bが早く立ち上がり、外側の温
度aの立ち上がりは幾分遅れるものの、触媒11が劣化
してくると、劣化が進行するにしたがい、図8、図9の
ように外側の温度aの立ち上がりが遅くなり、外側の温
度aと内側の温度bとの差ΔTが拡がってくる。Here, when the temperature state of the cross section of the catalyst 11 immediately after the start of the engine is shown, when the catalyst 11 is new,
As shown in FIGS. 6 and 7, the reaction temperature of the inflowing exhaust gas causes the inner temperature b, which is surrounded by the peripheral portion, to rise quickly and the outer temperature a to rise somewhat later. 8 and FIG. 9, the rise of the outer temperature a is delayed, and the difference ΔT between the outer temperature a and the inner temperature b is increased.
【0033】なお、触媒11が劣化してくると、定常運
転時の外側の温度aと内側の温度bとの差ΔTも拡が
る。When the catalyst 11 deteriorates, the difference ΔT between the outside temperature “a” and the inside temperature “b” during the steady operation increases.
【0034】即ち、エンジンの始動後、所定時間TMが
経過した時点の触媒11の内側温度bと外側温度aの差
ΔTを所定の劣化判定規定値と比較することにより、触
媒11の劣化を的確に判定できる。また、触媒11が劣
化すると、警告ランプ27を点灯して、運転者に触媒の
交換時期が来たのを知らせることができる。That is, by comparing the difference ΔT between the inside temperature b and the outside temperature a of the catalyst 11 at the time when the predetermined time TM has elapsed after the start of the engine with the predetermined deterioration determination specified value, the deterioration of the catalyst 11 is accurately determined. Can be determined. When the catalyst 11 is deteriorated, the warning lamp 27 is turned on to notify the driver that the catalyst replacement time has come.
【0035】また、温度センサ13,14をセンサ支持
体17に一体に組込んで、触媒11の横断面上に配置す
るので、温度センサ13,14の取付けを容易に行え、
構造が簡素化すると共に、温度センサ13,14を触媒
11内部に配置するので、両温度センサ13,14がさ
らされる環境がほぼ同じになり、このため長期間使用し
ている間に温度センサ13,14が劣化してきても、そ
の劣化のバラツキは少ないものとなる。Further, since the temperature sensors 13 and 14 are integrated into the sensor support 17 and are arranged on the cross section of the catalyst 11, the temperature sensors 13 and 14 can be easily mounted.
Since the structure is simplified and the temperature sensors 13 and 14 are arranged inside the catalyst 11, the environment to which the temperature sensors 13 and 14 are exposed is substantially the same. , 14 deteriorate, there is little variation in the deterioration.
【0036】したがって、両温度センサ13,14間で
の出力のバラツキが抑えられ、温度センサ13,14の
信頼性ならびに触媒11の劣化判定の信頼性が向上し、
その劣化判定によって触媒11の正確な交換時期を検知
できる。Therefore, the variation in the output between the two temperature sensors 13 and 14 is suppressed, and the reliability of the temperature sensors 13 and 14 and the reliability of the deterioration judgment of the catalyst 11 are improved.
Accurate replacement time of the catalyst 11 can be detected by the deterioration determination.
【0037】図10は本発明の他の実施例で、エンジン
の定常運転時に第1、第2の温度センサ13,14によ
る温度検出を行って、触媒11の劣化判定を行うように
したものである。FIG. 10 shows another embodiment of the present invention, in which the temperature of the catalyst 11 is judged by detecting the temperature by the first and second temperature sensors 13 and 14 during the steady operation of the engine. is there.
【0038】この場合、ステップ11でエンジンの負
荷、回転数、冷却水温等の各運転条件信号に基づいて、
エンジンが所定の定常走行状態(エンジンの負荷、回転
数が一定の範囲)にあるかどうかを判定する。In this case, in step 11, based on the respective operating condition signals such as the load of the engine, the number of revolutions, and the cooling water temperature,
It is determined whether or not the engine is in a predetermined steady running state (the load and the number of revolutions of the engine are within a certain range).
【0039】所定の定常走行状態にあれば、ステップ1
2で第1、第2の温度センサ13,14の検出信号を読
み込み、内部(触媒中心部)温度bと、外側(触媒周辺
部)温度aを計測する。If the vehicle is in a predetermined steady running state, step 1
In step 2, detection signals from the first and second temperature sensors 13 and 14 are read, and an internal (catalyst center) temperature b and an external (catalyst peripheral) temperature a are measured.
【0040】次に、ステップ13でその内側温度bと外
側温度aの差ΔTを計算し、ステップ14でその差ΔT
を劣化判定規定値(前記実施例の劣化判定規定値よりも
小さい値を取る)と比較する。Next, at step 13, the difference ΔT between the inside temperature b and the outside temperature a is calculated, and at step 14, the difference ΔT
Is compared with a specified value for deterioration determination (takes a value smaller than the specified value for deterioration determination in the above embodiment).
【0041】そして、その差ΔTが劣化判定規定値より
大きければ、触媒11が劣化していると判定し、ステッ
プ15で警告ランプ27を点灯する。If the difference ΔT is larger than the specified value for determining deterioration, it is determined that the catalyst 11 has deteriorated, and the warning lamp 27 is turned on in step 15.
【0042】即ち、触媒11が劣化してくると、反応が
遅れる分、定常運転時においても、触媒11の内側温度
bと外側温度aの差ΔTが拡がり、これにより定常運転
時の内側温度bと外側温度aの差ΔTを所定の劣化判定
規定値と比較することにより、触媒11の劣化を的確に
判定できる。定常運転時は、内側温度bと外側温度aの
差ΔTの変化が少ないので、安定した状態で触媒11の
劣化を判定でき、判定を容易に行える。That is, when the catalyst 11 deteriorates, the difference ΔT between the inside temperature b and the outside temperature a of the catalyst 11 increases even during the steady operation due to the delay in the reaction, thereby increasing the inside temperature b during the steady operation. By comparing the difference ΔT between the temperature and the outside temperature a with a predetermined deterioration determination specified value, the deterioration of the catalyst 11 can be accurately determined. During steady operation, the change in the difference ΔT between the inside temperature b and the outside temperature a is small, so that deterioration of the catalyst 11 can be determined in a stable state, and the determination can be easily performed.
【0043】[0043]
【0044】[0044]
【0045】[0045]
【発明の効果】以上のように第1の発明は、エンジンの
排気ガスを浄化する触媒コンバータの触媒の劣化を検出
する装置において、触媒中心部の温度を検出する第1の
温度センサと、前記第1の温度センサに対して触媒の同
一横断面上に配置され、触媒周辺部の温度を検出する第
2の温度センサと、両温度センサの検出値を比較して或
る時点の温度差が所定値以上のとき劣化と判断する判定
手段とを設けたので、両温度センサの劣化のバラツキを
抑えて、触媒の劣化を的確に判定でき、信頼性が向上す
る。As described above, the first invention is a device for detecting deterioration of a catalyst of a catalytic converter for purifying exhaust gas of an engine, comprising: a first temperature sensor for detecting a temperature of a central portion of the catalyst; The same temperature of the catalyst
A second temperature sensor that is disposed on one cross section and detects the temperature around the catalyst, and compares the detection values of the two temperature sensors with each other to determine that the temperature has deteriorated when a temperature difference at a certain point in time is equal to or greater than a predetermined value. With the provision of the means, it is possible to suppress the variation in the deterioration of both temperature sensors, accurately determine the deterioration of the catalyst, and improve the reliability.
【0046】第2の発明は、排気の流入初期の触媒中心
部と周辺部の温度の立ち上がり状態を基に、触媒の劣化
判定を的確に行える。According to the second aspect of the present invention, it is possible to accurately determine the deterioration of the catalyst based on the temperature rising state of the central portion and the peripheral portion of the catalyst at the initial stage of the inflow of the exhaust gas.
【0047】第3の発明は、定常運転時の安定した状態
で、触媒の劣化判定を的確に行える。According to the third aspect of the present invention, it is possible to accurately determine the deterioration of the catalyst in a stable state at the time of steady operation.
【0048】第4の発明は、温度センサの組付性が向上
する。According to the fourth invention, the assemblability of the temperature sensor is improved.
【図1】本発明の構成図である。FIG. 1 is a configuration diagram of the present invention.
【図2】実施例の構成断面図である。FIG. 2 is a configuration sectional view of an embodiment.
【図3】温度センサをセンサ支持体に組込んだ構成図で
ある。FIG. 3 is a configuration diagram in which a temperature sensor is incorporated in a sensor support.
【図4】温度センサに熱電対を用いた他の例を示す構成
図である。FIG. 4 is a configuration diagram showing another example using a thermocouple for a temperature sensor.
【図5】触媒劣化判定のフローチャートである。FIG. 5 is a flowchart of catalyst deterioration determination.
【図6】触媒が新しいときの触媒の温度の立ち上がり状
態を示す説明図である。FIG. 6 is an explanatory diagram showing a rising state of the temperature of the catalyst when the catalyst is new.
【図7】触媒が新しいときの触媒の温度の立ち上がり特
性図である。FIG. 7 is a graph showing a temperature rise characteristic of a catalyst when the catalyst is new.
【図8】触媒の劣化時の触媒の温度の立ち上がり状態を
示す説明図である。FIG. 8 is an explanatory diagram showing a rising state of the temperature of the catalyst when the catalyst is deteriorated.
【図9】触媒の劣化時の触媒の温度の立ち上がり特性図
である。FIG. 9 is a graph showing a rising characteristic of the temperature of the catalyst when the catalyst is deteriorated.
【図10】他の実施例の触媒劣化判定のフローチャート
である。FIG. 10 is a flowchart of catalyst deterioration determination according to another embodiment.
10 触媒コンバータ 11 触媒 13 第1の温度センサ 14 第2の温度センサ 15,16 熱感知部 17 センサ支持体 25 判定回路 26 イグニッションスイッチ 27 警告ランプ 30,31 センサ支持体 DESCRIPTION OF SYMBOLS 10 Catalytic converter 11 Catalyst 13 1st temperature sensor 14 2nd temperature sensor 15, 16 Heat sensing part 17 Sensor support 25 Judgment circuit 26 Ignition switch 27 Warning lamp 30, 31 Sensor support
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) F01N 3/00 - 3/38 F01N 9/00 - 11/00 F02B 77/08 F02D 35/00 F02D 45/00 ──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. 7 , DB name) F01N 3/00-3/38 F01N 9/00-11/00 F02B 77/08 F02D 35/00 F02D 45 / 00
Claims (4)
バータの触媒の劣化を検出する装置において、触媒中心
部の温度を検出する第1の温度センサと、前記第1の温
度センサに対して触媒の同一横断面上に配置され、触媒
周辺部の温度を検出する第2の温度センサと、両温度セ
ンサの検出値を比較して或る時点の温度差が所定値以上
のとき劣化と判断する判定手段とを設けたことを特徴と
する触媒コンバータの触媒劣化検出装置。An apparatus for detecting deterioration of a catalyst of a catalytic converter for purifying exhaust gas of an engine, comprising: a first temperature sensor for detecting a temperature of a central portion of the catalyst;
A second temperature sensor that is disposed on the same cross section of the catalyst with respect to the temperature sensor and detects the temperature around the catalyst; A catalyst deterioration detecting device for a catalytic converter, comprising a judgment means for judging deterioration in the case of (1).
を経過した時点とすることを特徴とする請求項1に記載
の触媒コンバータの触媒劣化装置。2. The catalyst deterioration device for a catalytic converter according to claim 1, wherein a certain time point is a time point when a predetermined time has elapsed after the start of the engine.
徴とする請求項1に記載の触媒コンバータの触媒劣化装
置。3. The catalyst deterioration device for a catalytic converter according to claim 1, wherein a certain time point is a time of a steady operation.
持体に一体に組込まれたことを特徴とする請求項1に記
載の触媒コンバータの触媒劣化装置。 4. The apparatus according to claim 1, wherein said first and second temperature sensors are connected to one support.
The catalyst deterioration device for a catalytic converter according to claim 1, wherein the catalyst deterioration device is integrated with the holding body .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32480393A JP3147632B2 (en) | 1993-12-22 | 1993-12-22 | Catalyst deterioration detection device for catalytic converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32480393A JP3147632B2 (en) | 1993-12-22 | 1993-12-22 | Catalyst deterioration detection device for catalytic converter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07180537A JPH07180537A (en) | 1995-07-18 |
JP3147632B2 true JP3147632B2 (en) | 2001-03-19 |
Family
ID=18169857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32480393A Expired - Fee Related JP3147632B2 (en) | 1993-12-22 | 1993-12-22 | Catalyst deterioration detection device for catalytic converter |
Country Status (1)
Country | Link |
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JP (1) | JP3147632B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6446445B2 (en) * | 2013-10-15 | 2018-12-26 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニーJohnson Matthey Public Limited Company | On-board diagnostic system for catalyzed substrates |
-
1993
- 1993-12-22 JP JP32480393A patent/JP3147632B2/en not_active Expired - Fee Related
Also Published As
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JPH07180537A (en) | 1995-07-18 |
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