JPH01170750A - Trouble diagnostic device in exhaust gas recirculation control device - Google Patents
Trouble diagnostic device in exhaust gas recirculation control deviceInfo
- Publication number
- JPH01170750A JPH01170750A JP62334599A JP33459987A JPH01170750A JP H01170750 A JPH01170750 A JP H01170750A JP 62334599 A JP62334599 A JP 62334599A JP 33459987 A JP33459987 A JP 33459987A JP H01170750 A JPH01170750 A JP H01170750A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- intake air
- valve
- intake
- gas recirculation
- 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
- 238000003745 diagnosis Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 12
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 239000000446 fuel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/55—Systems for actuating EGR valves using vacuum actuators
- F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
- F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
本発明は、排気ガス還流ＩＩＩ １！Ｉｔ装置における
故障診断装置に関するものである。The present invention provides exhaust gas recirculation III 1! The present invention relates to a failure diagnosis device for IT equipment.
排気ガス浄化の一貫として、自動車における排気ガス還
流制御装置では、エンジンの運転条件によって、排気系
の排気ガスの一部を、吸気系に還流させる方法がとられ
ている。この場合、排気ガスの還流制御のためのＩＩＪ
ｔＩｌバルブが故障するなどによって、排気還流が正し
く行えなくなる場合がある。このため、例えば、排気系
から吸気系へ向けて排気ガスの一部を還流する排気還流
通路に、上記制御バルブより下流に位置して温度センサ
を配設し、排気還流を必要とする車輌加速時などの運転
条件において、上記温度センサが所定値以下を検出する
時、制御バルブが閉塞状態で故障していることを判定し
、警報する故障警報装置が提唱されている（実開昭５７
−１８２２５１号公報参照）。As part of exhaust gas purification, exhaust gas recirculation control devices in automobiles employ a method of recirculating a portion of the exhaust gas from the exhaust system to the intake system depending on the operating conditions of the engine. In this case, IIJ for exhaust gas recirculation control
Exhaust gas recirculation may not be performed properly due to a malfunction of the tIl valve. For this reason, for example, a temperature sensor may be disposed downstream of the control valve in the exhaust gas recirculation passageway that recirculates a portion of exhaust gas from the exhaust system to the intake system, thereby reducing the acceleration of a vehicle that requires exhaust gas recirculation. A failure alarm device has been proposed that determines that the control valve is in a closed state and has a failure and issues an alarm when the temperature sensor detects a temperature below a predetermined value under certain operating conditions.
(Refer to Publication No.-182251).
ここで問題になるのは、上記故障警報装置では排気還流
通路に故障診断のためだけに温度センサを設置しなけれ
ばならないために、効用の割にはコスト高となること、
制御バルブが開放状態のまま故障している場合には、故
障診断ができないことなどである。
そこで、本発明は、通常、電子制御回路を用いて、吸気
系における空燃比制御を行う場合、使用されている吸気
系における吸気温センサを利用して、全く特別な構成を
用いることなく、電子制御回路における制御システムの
利用で、排気ガス還流装置の故障診断が完全に行えるよ
うにした故障診断装置を提供しようとするものである。The problem here is that with the above failure alarm system, a temperature sensor must be installed in the exhaust gas recirculation passage just for failure diagnosis, so it is expensive compared to its effectiveness.
If the control valve remains open and fails, failure diagnosis cannot be performed. Therefore, when the air-fuel ratio in the intake system is normally controlled using an electronic control circuit, the present invention utilizes the intake air temperature sensor in the intake system that is used to control the air-fuel ratio in the intake system without using any special configuration. It is an object of the present invention to provide a failure diagnosis device that can completely diagnose the failure of an exhaust gas recirculation device by using a control system in a control circuit.
このため、本発明ではエンジンの運転条件によって排気
系の排気ガスを一部、吸気系に還流する排気ガス還流制
御装置において、上記吸気系の排気ガス還流口近傍に位
置して配設された吸気温センサと、排気還流のためのバ
ルブ制御を行なうバルブ制御指令手段と、所定時間毎に
排気還流のためのバルブの開閉制御が上記バルブ制御指
令手段で行なわれる時、上記吸気温センサの出力信号を
検知する吸気温検知手段と、上記バルブの開放時と、閉
塞時とのそれぞれの吸気温センサの出力値を比較する吸
気温比較手段と、上記吸気温比較手段で得た差の値が所
定値を越えない時、故障判定する故障判定手段とを具備
している。Therefore, in the present invention, in an exhaust gas recirculation control device that recirculates part of the exhaust gas from the exhaust system to the intake system depending on engine operating conditions, an an air temperature sensor, a valve control command means for controlling a valve for exhaust gas recirculation, and when the valve control command means controls the opening and closing of the valve for exhaust gas recirculation at predetermined intervals, an output signal of the intake temperature sensor; an intake temperature detection means for detecting the temperature, an intake temperature comparison means for comparing the output values of the intake temperature sensors when the valve is open and when the valve is closed, and a difference value obtained by the intake temperature comparison means is determined to be a predetermined value. A failure determining means is provided for determining a failure when the value does not exceed the value.
したがって、バルブの開閉制御に故障があったか否かな
どの故障診断に際しては、吸気温センサの信号を利用で
きるので、この故障診断のために、単独に温度センサを
設置する必要がなく、また、所定時間毎におけるバルブ
の開閉制御で得られた信号の比較から故障判定するため
、バルブの開・閉状態のいづれにおける故障、その他、
排気還流通路の詰り、破損による漏れなどによる故障も
判定できる完全な故障診断である。Therefore, the signal from the intake temperature sensor can be used for fault diagnosis such as whether or not there is a fault in the valve opening/closing control, so there is no need to install a separate temperature sensor for this fault diagnosis. In order to determine failures based on comparison of signals obtained from valve opening/closing control at each time, failures in either the open or closed state of the valve, etc.
This is a complete failure diagnosis that can also determine failures caused by clogging of the exhaust gas recirculation passage or leakage due to damage.
以下、本発明の一実施例を図面を参照して具体的に説明
する。
図１において、符号１はエンジンであり、その吸気系２
は、エヤクリーナ３から吸気チャンバ４を介して各吸気
マニホールド５に連通される形態になっており、上記吸
気チャンバ４には吸気温センサ６が設けられている。ま
た、上記吸気チャンバ４の直上流にはスロットルバルブ
７が設けてあり、また、各吸気マニホールド５には各気
筒に対応して燃料噴射弁８が設けられている。
上記吸気系２において、上記スロットルバルブ７の直下
流には、負圧検出用の負圧路９が開口しており、上記負
圧路９は制御バルブ１０を経由してダイヤフラム式の排
気還流バルブ１１の負圧室１１ａに連通されている。上
記排気還流バルブ１１はエンジン１の排気系１７に連通
ずる排気ガス還流路１３の途中に設けてあり、上記排気
ガス還流路１３の吐出口１３ａは吸気チャンバ４ （あ
るいはその直上流の吸気系）に開口している。上記制御
バルブ１ｏは、ソレノイド１０ａを附勢した時、閉じら
れ、かつ排気還流バルブ１１の負圧室１１ａを大気圧に
するように大気に連通され、また、ソレノイド１０ａを
消勢した時、開放されて、負圧路９の負圧を上記負圧１
１１ａに与え、かつ大気との連通を所っように構成され
ており、上記ソレノイド１０ａの附勢あるいは消勢の制
御はコントロールユニット１４からの指令でなされる。
上記コントロールユニット１４は、バルブ制御指令手段
９１、吸気温検知手段９２、吸気温比較手段９３および
故障判定手段９４を具備しており、上記バルブ制御指令
手段９１は、エンジンの駆動状態において、例えば自己
診断するための所定モードでの自動車運転時に、故障診
断を行なうため、制御バルブ１０のソレノイド１０ａを
附勢あるいは消勢する指令信号を、所定時間毎に出力す
るもので、ソレノイド１０ａの附勢で、排気還流バルブ
１１が負圧をうけて排気ガス還流路１３を吸気系に連通
する。そして、この時の吸気温センサ６の出力は吸気温
検知手段９２で検知され、コントロールユニット１４の
メモリ（ＲＡＭ）に記憶される。上記吸気温比較手段９
３では、バルブ制御指令手段９１の指令信号のオンから
オフへの切換えの都度、前段における吸気温センサ６の
出力値（メモリ中に記憶されている）と、今回の吸気温
検知手段９２の出力値（すなわち吸気温センサ６の出力
値）とを比較し、その差の値を求める。そして、故障判
定手段９４では、吸気温センサ６の不感帯を越える成る
基準値以上の値を上記差値が示す時には、排気ガスが正
常に還流して吸気温度が上昇し故障していないと判定し
、基準値以下であれば、排気ガスが正常に還流せず故障
していると判定する。
なお、図中、符号１５はスロットルセンサ、１６はＯｚ
センサ、１８は三元触媒、１９はエンジン回転数センサ
である。
このような構成では、自動車運転時の所定モード、即ら
所定のスロットル開度で所定のエンジン回転数のとき、
例えば車速４０ｋｍ／ ｈ走行運転時に所定時間毎に、
バルブ制御指令手段９１で指令が出され、この時、制御
バルブ１０の開閉制御がなされる。正常であれば負圧が
負圧９１１ａに働く時、すなわち、排気ガスが還流路１
３を介してチャンバ４に流入されて、吸気温センサ６の
温度検出値が上昇する。また、負圧ｐＨａから負圧が除
かれる時、還流路１３がバルブ１１で閉塞されれば、吸
気温センサ６の温度検出値が下降し、大気温度になる。
正常であれば、以上のようにして、負圧路９の制御バル
ブ１０の閉状態の時、排気連流ノ〈ルブ１１が開き、吸
気温検知手段９２での検出値が高くなり、制御バルブ１
０が閉状態の時、バルブ１１が閉じ、吸気温検知手段９
２での検出値が低くなるから、吸気温比較手段９３での
差値により、故障判定手段９４では、故障していないと
判定できる。
もし、排気還流バルブ１１が故障して、開放されたまま
となれば、バルブ制御指令手段９１で指令している時、
所定時間毎の前段の温度と模膜の温度とに差がなくなる
。すなわち、還流路１３は開放されたままで、排気ガス
は吸気系に入り、吸気温センサ６に影響して、いづれの
場合も、吸気温検知手段９２で高い検出値をとってしま
う。また、例えば、バルブ１１が閉じたままであれば、
あるいは還流路１３に詰りを生じていれば、逆に、排気
ガスは吸気系に入らず、吸気温は上昇せず吸気温センサ
６は大気温を示し、いづれの場合も、吸気温検知手段９
２が低い検出値をとってしまう。その結果、故障判定手
段９４では、吸気温比較手段９３の示す差値が小さいこ
とから、故障であると判定する。Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In FIG. 1, reference numeral 1 is an engine, and its intake system 2
The air cleaner 3 is connected to each intake manifold 5 via an intake chamber 4, and the intake chamber 4 is provided with an intake temperature sensor 6. Further, a throttle valve 7 is provided immediately upstream of the intake chamber 4, and each intake manifold 5 is provided with a fuel injection valve 8 corresponding to each cylinder. In the intake system 2, a negative pressure path 9 for negative pressure detection is opened immediately downstream of the throttle valve 7, and the negative pressure path 9 is connected to a diaphragm type exhaust recirculation valve via a control valve 10. 11 negative pressure chamber 11a. The exhaust gas recirculation valve 11 is provided in the middle of an exhaust gas recirculation path 13 that communicates with the exhaust system 17 of the engine 1, and the discharge port 13a of the exhaust gas recirculation path 13 is connected to the intake chamber 4 (or the intake system immediately upstream thereof). It is open to The control valve 1o is closed when the solenoid 10a is energized and communicated with the atmosphere so as to bring the negative pressure chamber 11a of the exhaust recirculation valve 11 to atmospheric pressure, and is opened when the solenoid 10a is deenergized. The negative pressure in the negative pressure path 9 is changed to the negative pressure 1.
The solenoid 10a is connected to the atmosphere and communicated with the atmosphere, and energization or deenergization of the solenoid 10a is controlled by a command from the control unit 14. The control unit 14 includes a valve control command means 91, an intake temperature detection means 92, an intake temperature comparison means 93, and a failure determination means 94. When the vehicle is operated in a predetermined mode for diagnosis, a command signal for energizing or deenergizing the solenoid 10a of the control valve 10 is output at predetermined time intervals in order to perform failure diagnosis. , the exhaust gas recirculation valve 11 receives negative pressure and communicates the exhaust gas recirculation path 13 with the intake system. The output of the intake temperature sensor 6 at this time is detected by the intake temperature detection means 92 and stored in the memory (RAM) of the control unit 14. The above-mentioned intake temperature comparison means 9
3, each time the command signal of the valve control command means 91 is switched from on to off, the output value of the intake temperature sensor 6 in the previous stage (stored in the memory) and the current output of the intake temperature detection means 92 are (that is, the output value of the intake air temperature sensor 6), and the difference between them is determined. When the difference value indicates a value greater than or equal to the reference value exceeding the dead zone of the intake air temperature sensor 6, the failure determination means 94 determines that the exhaust gas is normally recirculated and the intake air temperature rises, and that there is no failure. , if it is below the reference value, it is determined that the exhaust gas is not recirculating normally and there is a failure. In addition, in the figure, numeral 15 is a throttle sensor, 16 is Oz
A sensor 18 is a three-way catalyst, and 19 is an engine rotation speed sensor. In such a configuration, when the vehicle is operated in a predetermined mode, that is, at a predetermined throttle opening and a predetermined engine speed,
For example, at predetermined intervals when driving at a vehicle speed of 40 km/h,
A command is issued by the valve control command means 91, and at this time, the opening and closing of the control valve 10 is controlled. Normally, when negative pressure acts on the negative pressure 911a, that is, when the exhaust gas
3 into the chamber 4, and the temperature detected by the intake temperature sensor 6 increases. Further, when the negative pressure is removed from the negative pressure pHa, if the reflux path 13 is closed by the valve 11, the temperature detected by the intake air temperature sensor 6 decreases to the atmospheric temperature. If it is normal, as described above, when the control valve 10 of the negative pressure path 9 is in the closed state, the exhaust communication valve 11 will open, the detected value by the intake temperature detection means 92 will become high, and the control valve will close. 1
0 is in the closed state, the valve 11 is closed and the intake temperature detection means 9
Since the detected value at 2 becomes low, the failure determining means 94 can determine that there is no failure based on the difference value at the intake temperature comparing means 93. If the exhaust gas recirculation valve 11 fails and remains open, when commanded by the valve control command means 91,
There is no difference between the temperature of the previous stage and the temperature of the mock film at each predetermined time interval. That is, the recirculation path 13 remains open, and the exhaust gas enters the intake system and influences the intake temperature sensor 6, causing the intake temperature detection means 92 to take a high detection value in either case. Also, for example, if the valve 11 remains closed,
Alternatively, if the recirculation path 13 is clogged, the exhaust gas will not enter the intake system, the intake temperature will not rise, and the intake temperature sensor 6 will indicate the atmospheric temperature.
2 results in a low detection value. As a result, the failure determination means 94 determines that there is a failure since the difference value indicated by the intake temperature comparison means 93 is small.
本発明は、以上詳述したようになり、還流された排気ガ
スを、吸気系における吸気温の変化として吸気温センサ
で捕えることにより、故障診断することができるので、
特に、排気ガス還流通路に、センサを設けて故障診断す
るものと異なり、コスト高となることがなく、しかも、
排気還流バルブの開・閉状態のいづれにおける故障、そ
の他、排気速流通路の詰り、破損による漏れなどによる
故障を判定でき、完全な故障診断ができる。The present invention has been described in detail above, and a malfunction can be diagnosed by detecting recirculated exhaust gas as a change in intake temperature in the intake system with an intake temperature sensor.
In particular, unlike the system in which a sensor is installed in the exhaust gas recirculation passage for fault diagnosis, there is no high cost, and
It is possible to determine failures in either the open or closed state of the exhaust recirculation valve, as well as failures due to clogging of the exhaust velocity flow path, leakage due to damage, etc., and complete failure diagnosis is possible.
第１図は本発明の一実施例を示す概略構成図、第２図は
コントロールユニットの排気還流の故障診断に係る構成
のブロック図である。
１・・・エンジン、４・・・吸気チャンバ、６・・・吸
気温センサ、９・・・負圧路、１０・・・制御バルブ、
１０ａ・・・ソレノイド、１１・・・排気還流バルブ、
１１ａ・・・負圧至、１３・・・排気還流路、１４・・
・コントロールユニット、９１・・・バルブ制御指令手
段、９２・・・吸気温検知手段、９３・・・吸気温比較
手段、９４・・・故障判定手段。
特許出願人 富士重工業株式会社代理人 弁理士
小 橋 信 滓
量 弁理士 村 井 進FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, and FIG. 2 is a block diagram of a configuration related to failure diagnosis of exhaust gas recirculation of a control unit. DESCRIPTION OF SYMBOLS 1... Engine, 4... Intake chamber, 6... Intake temperature sensor, 9... Negative pressure path, 10... Control valve,
10a... Solenoid, 11... Exhaust recirculation valve,
11a... To negative pressure, 13... Exhaust gas recirculation path, 14...
Control unit, 91...Valve control command means, 92...Intake temperature detection means, 93...Intake temperature comparison means, 94...Failure determination means. Patent applicant: Fuji Heavy Industries Co., Ltd. Agent: Patent attorney: Shin Kobashi Slag quantity: Patent attorney: Susumu Murai
Claims (1)
吸気系に還流する排気ガス還流制御装置において、上記
吸気系の排気ガス還流口近傍に位置して配設された吸気
温センサと、排気還流のためのバルブ制御を行なうバル
ブ制御指令手段と、所定時間毎に排気還流のためのバル
ブの開閉制御が上記バルブ制御指令手段で行なわれる時
、上記吸気温センサの出力信号を検知する吸気温検知手
段と、上記バルブの開放時と、閉塞時とのそれぞれの吸
気温センサの出力値を比較する吸気温比較手段と、上記
吸気温比較手段で得た差の値が所定値を越えない時、故
障判定する故障判定手段とを具備することを特徴とする
故障診断装置。Depending on engine operating conditions, some exhaust gas from the exhaust system may be
An exhaust gas recirculation control device that recirculates the exhaust gas to the intake system includes: an intake temperature sensor disposed near the exhaust gas recirculation port of the intake system; a valve control command means for controlling valves for exhaust gas recirculation; When the opening/closing control of the valve for exhaust gas recirculation is performed by the valve control command means every hour, the intake temperature detection means detects the output signal of the intake temperature sensor, and when the valve is opened and closed, It is characterized by comprising an intake temperature comparison means for comparing the output values of the respective intake temperature sensors, and a failure determination means for determining a failure when the difference value obtained by the intake temperature comparison means does not exceed a predetermined value. A fault diagnosis device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62334599A JPH01170750A (en) | 1987-12-26 | 1987-12-26 | Trouble diagnostic device in exhaust gas recirculation control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62334599A JPH01170750A (en) | 1987-12-26 | 1987-12-26 | Trouble diagnostic device in exhaust gas recirculation control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01170750A true JPH01170750A (en) | 1989-07-05 |
Family
ID=18279194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62334599A Pending JPH01170750A (en) | 1987-12-26 | 1987-12-26 | Trouble diagnostic device in exhaust gas recirculation control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01170750A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006300007A (en) * | 2005-04-22 | 2006-11-02 | Honda Motor Co Ltd | Abnormality determining device of egr device |
| US11441520B2 (en) | 2020-12-17 | 2022-09-13 | Volvo Truck Corporation | Method of determining an operational status of an EGR valve |
-
1987
- 1987-12-26 JP JP62334599A patent/JPH01170750A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006300007A (en) * | 2005-04-22 | 2006-11-02 | Honda Motor Co Ltd | Abnormality determining device of egr device |
| JP4621537B2 (en) * | 2005-04-22 | 2011-01-26 | 本田技研工業株式会社 | EGR device abnormality determination device |
| US11441520B2 (en) | 2020-12-17 | 2022-09-13 | Volvo Truck Corporation | Method of determining an operational status of an EGR valve |
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