JPH11230872A - Gas diluting apparatus - Google Patents

Gas diluting apparatus

Info

Publication number
JPH11230872A
JPH11230872A JP10033123A JP3312398A JPH11230872A JP H11230872 A JPH11230872 A JP H11230872A JP 10033123 A JP10033123 A JP 10033123A JP 3312398 A JP3312398 A JP 3312398A JP H11230872 A JPH11230872 A JP H11230872A
Authority
JP
Japan
Prior art keywords
gas
amount
dilution
air
exhaust gas
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
Application number
JP10033123A
Other languages
Japanese (ja)
Inventor
Mitsumasa Yamada
光正 山田
康之 ▲楡▼井
Yasuyuki Nirei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP10033123A priority Critical patent/JPH11230872A/en
Publication of JPH11230872A publication Critical patent/JPH11230872A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To sample a gas to be analyzed of an accurate amount by mixing the gas to be analyzed of an equal amount to a sampled amount of a diluting gas with the diluting gas. SOLUTION: A control circuit 7 operates an air sampling pump 10 to sample an air of an amount proportional to an exhaust gas flow rate to be detected by an exhaust gas flow rate sensor 16 from an air introducing tube 3 and controls an air sampling controller 9. Thus, since a part of the air introduced from the tube 3 is sampled at an upstream side of a dilute tube 2, the exhaust gas of an amount corresponding to the sampled air amount is introduced into the tube 2 via a gas introducing tube 5. This exhaust gas is mixed with the air in the tube 2. A mixed gas of the exhaust gas and the air is supplied to an exhaust gas analyzer via a mixed gas exhaust tube 4. And, it is controlled so that the mixed gas exhaust amount becomes equal to the air introducing amount. Thus, only a detecting error of the air sampled amount of the controller 9 affects an influence to the exhaust gas introducing amount, and its value is very small. Accordingly, the exhaust gas of more accurate amount can be introduced into the dilute tube.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は気体稀釈装置に関
し、特に内燃機関から排出される排気ガスを稀釈するた
めの排気ガス稀釈装置に関する。The present invention relates to a gas diluting device, and more particularly to an exhaust gas diluting device for diluting exhaust gas discharged from an internal combustion engine.

【０００２】[0002]

【従来の技術】排気ガスが内燃機関から大気に排出され
たときの排気ガス中の種々の成分を分析するために、法
規等で規定されている内燃機関運転パターン（以下、所
定運転モード）に沿って内燃機関を運転し、当該運転中
に排出される排気ガスを全て採取し、所定運転モードで
の内燃機関運転における排気ガスを分析する排気ガス分
析装置が知られている。この排気ガス分析では大気に放
出されたときの排気ガス中の成分を分析すべきである。
したがって従来の排気ガス分析では大気に放出されたと
きの排気ガス中の成分の状態を正確に作りだすために、
採取した排気ガスを空気で稀釈する排気ガス稀釈装置が
用いられる。しかしながら、当該排気ガス稀釈装置では
排気ガスを稀釈するために多量の空気を必要とするた
め、排気ガス稀釈装置自体が大型化するという問題があ
る。2. Description of the Related Art In order to analyze various components in exhaust gas when the exhaust gas is discharged from the internal combustion engine to the atmosphere, an internal combustion engine operation pattern (hereinafter, referred to as a predetermined operation mode) specified by laws and regulations is used. 2. Description of the Related Art There is known an exhaust gas analyzer that operates an internal combustion engine along with the exhaust gas, collects all exhaust gas discharged during the operation, and analyzes the exhaust gas during operation of the internal combustion engine in a predetermined operation mode. In this exhaust gas analysis, the components in the exhaust gas when released to the atmosphere should be analyzed.
Therefore, in the conventional exhaust gas analysis, in order to accurately create the state of the components in the exhaust gas when released to the atmosphere,
An exhaust gas dilution device that dilutes the collected exhaust gas with air is used. However, the exhaust gas diluting apparatus requires a large amount of air to dilute the exhaust gas, and thus has a problem that the exhaust gas diluting apparatus itself becomes large.

【０００３】上記問題を解決するために、所定運転モー
ドでの内燃機関運転中に内燃機関から刻々排出される排
気ガス量に比例した少量の排気ガスを採取し、この少量
の排気ガスを空気で稀釈し、稀釈された排気ガス（以
下、混合気）を分析する排気ガス分析装置が知られてい
る。この排気ガス分析装置では採取する排気ガス量が少
量であるため、稀釈に必要な空気量も少量である。[0003] In order to solve the above problem, a small amount of exhaust gas proportional to the amount of exhaust gas exhausted from the internal combustion engine during operation of the internal combustion engine in a predetermined operation mode is sampled, and this small amount of exhaust gas is collected by air. 2. Description of the Related Art Exhaust gas analyzers for analyzing diluted exhaust gas (hereinafter referred to as air-fuel mixture) are known. In this exhaust gas analyzer, the amount of exhaust gas to be collected is small, so the amount of air required for dilution is also small.

【０００４】上記排気ガス分析装置では予め定められた
量の混合気が排出されるように混合気の排出量を制御す
ると共に混合気の排出量より採取すべき排気ガスの量の
分だけ少ない量の空気が導入されるように空気の導入量
を制御する。空気の導入量が混合気の排出量より少ない
ため、排気ガスから空気の導入量と混合気の排出量との
差分の量の排気ガスが空気に混入される。In the above exhaust gas analyzer, the amount of the air-fuel mixture is controlled so that a predetermined amount of the air-fuel mixture is discharged, and the amount of the air-fuel mixture is smaller than the amount of the air-fuel mixture by the amount of the exhaust gas to be collected. The amount of air introduced is controlled so that the air is introduced. Since the amount of introduced air is smaller than the amount of discharged air-fuel mixture, the amount of exhaust gas that is the difference between the amount of air introduced and the amount of discharged air-fuel mixture is mixed into the air from the exhaust gas.

【０００５】[0005]

【発明が解決しようとする課題】ところで大気圧や大気
温度などの環境的な影響または流量検出センサおよび制
御弁の精度誤差により上記排気ガス分析装置において空
気の導入量や混合気の排出量が正確に検出されないこと
がある。したがって空気の導入量と混合気の排出量との
差が採取すべき排気ガスの量に相当しない可能性があ
る。本発明の目的は正確な量の分析用気体を稀釈用気体
に導入することにある。However, due to environmental influences such as atmospheric pressure and atmospheric temperature, or errors in the accuracy of flow rate detection sensors and control valves, the amount of air introduced and the amount of air-fuel mixture discharged in the exhaust gas analyzer are accurate. May not be detected. Therefore, the difference between the amount of introduced air and the amount of discharged air-fuel mixture may not correspond to the amount of exhaust gas to be collected. It is an object of the present invention to introduce a precise amount of an analytical gas into a diluent gas.

【０００６】[0006]

【課題を解決するための手段】上記課題を解決するため
に一番目の発明によれば、稀釈用気体を吸入し、該稀釈
用気体に予め定められた量の分析用気体を混入して稀釈
し、これら稀釈用気体と分析用気体との混合気を排出す
る気体稀釈装置において、該気体稀釈装置から排出され
る前記混合気の量を検出するための混合気量検出手段
と、前記吸入される稀釈用気体の吸入量が前記排出され
る混合気の排出量と等しくなるように稀釈用気体の吸入
量を制御するための稀釈用気体吸入量制御手段と、稀釈
用気体から該稀釈用気体に混入すべき分析用気体の量と
等しい量の稀釈用気体を採取することにより該採取され
た稀釈用気体の量と等しい量の分析用気体を稀釈用気体
に混入するための稀釈用気体採取手段とを具備する。し
たがって本発明によれば排出される混合気の量と等しい
量の稀釈用気体が導入され、その導入された稀釈用気体
から混入すべき分析用気体の量と等しい量の稀釈用気体
が採取され、これにより混入すべき量の分析用気体が稀
釈用気体に導入される。According to a first aspect of the present invention, a diluting gas is sucked, and a predetermined amount of an analyzing gas is mixed with the diluting gas. A gas diluting device for discharging a mixture of the diluting gas and the analyzing gas, wherein the mixed gas amount detecting means for detecting the amount of the mixed gas discharged from the gas diluting device; and Dilution gas intake amount control means for controlling the intake amount of the dilution gas so that the intake amount of the dilution gas becomes equal to the discharge amount of the discharged air-fuel mixture. Diluting gas sampling for collecting an amount of the diluting gas equal to the amount of the analyzing gas to be mixed into the diluting gas by mixing the same amount of the diluting gas with the collected diluting gas Means. Therefore, according to the present invention, an amount of the dilution gas equal to the amount of the mixture to be discharged is introduced, and an amount of the dilution gas equal to the amount of the analysis gas to be mixed is extracted from the introduced dilution gas. Thus, the amount of the analysis gas to be mixed is introduced into the dilution gas.

【０００７】上記課題を解決するために二番目の発明に
よれば、分析用気体を稀釈用気体に混入して稀釈するた
めの稀釈管と、該稀釈管の一端から稀釈用気体を導入す
るための稀釈用気体導入管と、前記分析用気体と稀釈用
気体との混合気を前記稀釈管の他端から排出するための
分析用気体排出管と、前記稀釈管の両端の間に分析用気
体を導入するための分析用気体導入管とを具備する気体
稀釈装置において、前記稀釈管に導入される稀釈用気体
の導入量が前記排出される混合気の量と等しくなるよう
に稀釈用気体の導入量を制御するための制御手段を具備
し、前記稀釈管に導入された稀釈用気体から予め定めら
れた量の稀釈用気体を採取する稀釈用気体採取管が前記
分析用気体が導入される稀釈管内の位置より稀釈用気体
導入管側に取り付けられる。したがって本発明によれば
排出される混合気の量と等しい量の稀釈用気体が導入さ
れ、その導入された稀釈用気体から混入すべき分析用気
体の量と等しい量の稀釈用気体が採取され、これにより
混入すべき量の分析用気体が稀釈用気体に導入される。According to a second aspect of the present invention, there is provided a dilution pipe for mixing an analysis gas into a dilution gas for dilution, and introducing a dilution gas from one end of the dilution pipe. A dilution gas inlet tube, an analysis gas discharge tube for discharging a mixture of the analysis gas and the dilution gas from the other end of the dilution tube, and an analysis gas between both ends of the dilution tube. A gas diluting device having an analytical gas introducing tube for introducing the diluting gas, so that the amount of the diluting gas introduced into the diluting tube is equal to the amount of the discharged gas mixture. Control means for controlling the introduction amount is provided, and the analysis gas is introduced into the dilution gas collection tube for collecting a predetermined amount of the dilution gas from the dilution gas introduced into the dilution tube. Attach to the dilution gas inlet pipe side from the position inside the dilution pipe It is. Therefore, according to the present invention, an amount of the dilution gas equal to the amount of the mixture to be discharged is introduced, and an amount of the dilution gas equal to the amount of the analysis gas to be mixed is extracted from the introduced dilution gas. Thus, the amount of the analysis gas to be mixed is introduced into the dilution gas.

【０００８】上記課題を解決するために三番目の発明に
よれば、一番目または二番目の発明において、前記稀釈
用気体が空気であり、前記分析用気体が内燃機関から排
出される排気ガスである。According to a third aspect of the present invention, in the first or second aspect, the dilution gas is air and the analysis gas is exhaust gas discharged from an internal combustion engine. is there.

【０００９】[0009]

【発明の実施の形態】本発明を図面を参照して詳細に説
明する。本発明の排気ガス稀釈装置１は空気と排気ガス
とを混合することにより排気ガスを空気で稀釈するため
の稀釈管２を具備する。本実施形態では空気が稀釈用気
体に相当し、排気ガスが分析用気体に相当し、稀釈管２
が稀釈手段に相当する。稀釈管２の一端または上流端２
ａには稀釈管２に空気を導入または吸入するための空気
導入管または空気吸入管３が取り付けられる。本実施形
態では空気導入管３が稀釈用気体導入手段または稀釈用
気体吸入手段に相当する。一方、稀釈管２の他端または
下流端２ｂには空気と排気ガスとの混合気を稀釈管２か
ら排出するための混合気排出管４が取り付けられる。本
実施形態では混合気排出管４が混合気排出手段に相当す
る。また、空気導入管３と混合気排出管４との間または
稀釈管２の両端の間の稀釈管２には排気ガスを採取して
稀釈管２内に導入するための排気ガス採取管または排気
ガス導入管５の一端または下流端５ａが取り付けられ
る。本実施形態では排気ガス導入管５が分析用気体採取
手段または分析用気体導入手段に相当する。なお、本明
細書において『上流』および『下流』とは各管内を流れ
る気体の流方向に沿って用いる用語である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. The exhaust gas dilution apparatus 1 of the present invention includes a dilution pipe 2 for diluting exhaust gas with air by mixing air and exhaust gas. In the present embodiment, the air corresponds to the dilution gas, the exhaust gas corresponds to the analysis gas, and the dilution pipe 2
Corresponds to the dilution means. One end or upstream end 2 of dilution tube 2
An air introduction pipe or an air suction pipe 3 for introducing or sucking air into the dilution pipe 2 is attached to a. In the present embodiment, the air introduction pipe 3 corresponds to a dilution gas introduction unit or a dilution gas suction unit. On the other hand, a mixture discharge pipe 4 for discharging a mixture of air and exhaust gas from the dilution pipe 2 is attached to the other end or the downstream end 2 b of the dilution pipe 2. In this embodiment, the mixture discharge pipe 4 corresponds to a mixture discharge means. Further, an exhaust gas sampling pipe or an exhaust gas for collecting exhaust gas and introducing the diluted gas into the dilution pipe 2 is provided between the air introduction pipe 3 and the mixture discharge pipe 4 or between both ends of the dilution pipe 2. One end or downstream end 5a of the gas introduction pipe 5 is attached. In the present embodiment, the exhaust gas introduction pipe 5 corresponds to an analysis gas sampling unit or an analysis gas introduction unit. In this specification, “upstream” and “downstream” are terms used along the flow direction of gas flowing in each pipe.

【００１０】空気導入管３には空気導入管３内に導入ま
たは吸入される空気の量（以下、空気導入量）を制御す
るための空気導入量制御弁または空気吸入量制御弁６が
取り付けられる。本実施形態では空気導入量制御弁６が
稀釈用気体導入量制御手段または稀釈用気体吸入量制御
手段に相当する。空気導入量制御弁６は制御回路（ＥＣ
Ｕ）７に接続される。制御回路７は空気導入量制御弁６
の開弁量を制御する。空気導入量制御弁６と稀釈管２と
の間の空気導入管３には空気導入管３内の空気の一部を
採取するための空気採取管８が取り付けられる。本実施
形態では空気採取管８が稀釈用気体採取手段に相当す
る。空気導入管３の上流端は大気に開放されている。An air introduction amount control valve or an air intake amount control valve 6 for controlling the amount of air introduced or taken into the air introduction tube 3 (hereinafter, referred to as air introduction amount) is attached to the air introduction tube 3. . In the present embodiment, the air introduction amount control valve 6 corresponds to a dilution gas introduction amount control unit or a dilution gas intake amount control unit. The air introduction amount control valve 6 is controlled by a control circuit (EC
U) 7. The control circuit 7 includes an air introduction amount control valve 6
Is controlled. An air collecting pipe 8 for collecting a part of the air in the air introducing pipe 3 is attached to the air introducing pipe 3 between the air introducing quantity control valve 6 and the dilution pipe 2. In the present embodiment, the air sampling pipe 8 corresponds to a dilution gas sampling means. The upstream end of the air introduction pipe 3 is open to the atmosphere.

【００１１】空気採取管８には空気採取管８内に採取さ
れた空気の量（以下、空気採取量）を検出するための空
気採取量検出センサ（図示せず）と空気採取量を空気導
入管３から採取すべき空気の量に制御するための空気採
取量制御弁（図示せず）とを備えた空気採取制御装置９
が取り付けられる。本実施形態では空気採取制御装置９
が稀釈用空気採取制御手段に相当する。空気採取制御装
置９は制御回路７に接続される。空気採取制御装置９の
空気採取量検出センサにより検出された空気採取量に対
応する信号は制御回路７に入力され、制御回路７は空気
採取制御装置９の空気採取量制御弁の開弁量を制御す
る。空気採取制御装置９の下流側の空気採取管８には空
気採取用ポンプまたは第一ポンプ１０が取り付けられ
る。空気採取用ポンプ１０は制御回路７に接続される。
制御回路７は空気採取用ポンプ１０の作動を制御する。An air sampling amount sensor (not shown) for detecting the amount of air collected in the air sampling tube 8 (hereinafter referred to as an air sampling amount) and an air sampling amount are introduced into the air sampling tube 8. Air sampling control device 9 having an air sampling amount control valve (not shown) for controlling the amount of air to be sampled from pipe 3
Is attached. In the present embodiment, the air sampling control device 9
Corresponds to the dilution air sampling control means. The air sampling control device 9 is connected to the control circuit 7. A signal corresponding to the air sampling amount detected by the air sampling amount detection sensor of the air sampling control device 9 is input to the control circuit 7, and the control circuit 7 determines the opening amount of the air sampling amount control valve of the air sampling control device 9. Control. An air sampling pump or a first pump 10 is attached to the air sampling pipe 8 downstream of the air sampling control device 9. The air sampling pump 10 is connected to the control circuit 7.
The control circuit 7 controls the operation of the air sampling pump 10.

【００１２】混合気排出管４には予め定められた量また
は一定量の混合気を稀釈管２から排出するためのオリフ
ィス１１が取り付けられる。本実施形態ではオリフィス
１１が混合気排出量制御手段に相当する。オリフィス１
１の下流側の混合気排出管４には混合気排出管４から排
出される混合気の量（以下、混合気排出量）を検出する
ための混合気排出量センサ１２が取り付けられる。本実
施形態では混合気排出量センサ１２が混合気排出量検出
手段に相当する。混合気排出量センサ１２は制御回路７
に接続される。混合気排出量センサ１２により検出され
た混合気排出量に対応する信号は制御回路７に入力され
る。混合気排出量センサ１２の下流側の混合気排出管４
には混合気排出用ポンプ１３が取り付けられる。混合気
排出量ポンプ１３は制御回路７に接続される。制御回路
７は混合気排出量ポンプ１３の作動を制御する。混合気
排出管４の下流端は排気ガス中の成分を分析するための
排気ガス分析装置（図示せず）が接続される。An orifice 11 for discharging a predetermined amount or a fixed amount of air-fuel mixture from the dilution tube 2 is attached to the air-fuel mixture discharge pipe 4. In the present embodiment, the orifice 11 corresponds to an air-fuel mixture discharge amount control unit. Orifice 1
An air-fuel mixture discharge sensor 12 for detecting the amount of air-fuel mixture discharged from the air-fuel mixture discharge pipe 4 (hereinafter, air-fuel mixture discharge amount) is attached to the air-fuel mixture discharge pipe 4 on the downstream side of 1. In this embodiment, the mixture discharge sensor 12 corresponds to a mixture discharge detecting means. The air-fuel mixture discharge sensor 12 controls the control circuit 7
Connected to. A signal corresponding to the mixture discharge amount detected by the mixture discharge sensor 12 is input to the control circuit 7. A mixture discharge pipe 4 downstream of the mixture discharge sensor 12
Is provided with an air-fuel mixture discharge pump 13. The mixture discharge pump 13 is connected to the control circuit 7. The control circuit 7 controls the operation of the mixture discharge pump 13. An exhaust gas analyzer (not shown) for analyzing components in the exhaust gas is connected to a downstream end of the mixture discharge pipe 4.

【００１３】排気ガス導入管５の他端５ｂは内燃機関１
５から排出される排気ガスが流れる排気管または排気通
路１４に取り付けられる。排気ガス導入管５と内燃機関
１５との間の排気管１４には排気管１４内を流れる排気
ガスの量（以下、排気ガス流量）を検出するための排気
ガス流量センサ１６が取り付けられる。本実施形態では
排気ガス流量センサ１６が分析用気体量検出手段に相当
する。排気ガス流量センサ１６は制御回路７に接続され
る。排気ガス流量センサ１６により検出された排気ガス
流量に対応する信号は制御回路７に入力される。The other end 5 b of the exhaust gas introduction pipe 5 is connected to the internal combustion engine 1.
5 is attached to an exhaust pipe or an exhaust passage 14 through which the exhaust gas discharged from the exhaust pipe 5 flows. An exhaust gas flow sensor 16 for detecting the amount of exhaust gas flowing in the exhaust pipe 14 (hereinafter, exhaust gas flow rate) is attached to the exhaust pipe 14 between the exhaust gas introduction pipe 5 and the internal combustion engine 15. In the present embodiment, the exhaust gas flow sensor 16 corresponds to an analysis gas amount detection unit. The exhaust gas flow sensor 16 is connected to the control circuit 7. A signal corresponding to the exhaust gas flow rate detected by the exhaust gas flow rate sensor 16 is input to the control circuit 7.

【００１４】次に本発明の排気ガス稀釈装置の作用を説
明する。排気ガスを排気ガス分析装置に供給すべきとき
には混合気排出用ポンプ１３が作動せしめられる。次に
混合気排出管４から予め定められた量の混合気が排出さ
れるように混合気排出用ポンプ１３の作動が制御回路７
により制御される。次に空気導入管３内に導入される空
気導入量が上記混合気排出管４から排出される混合気排
出量と等しくなるように空気導入量制御弁６の開弁量が
制御回路７により制御される。次に内燃機関１５が所定
運転モードで運転せしめられる。Next, the operation of the exhaust gas dilution apparatus of the present invention will be described. When the exhaust gas is to be supplied to the exhaust gas analyzer, the air-fuel mixture discharge pump 13 is operated. Next, the operation of the mixture discharge pump 13 is controlled by the control circuit 7 so that a predetermined amount of the mixture is discharged from the mixture discharge pipe 4.
Is controlled by Next, the opening amount of the air introduction amount control valve 6 is controlled by the control circuit 7 so that the amount of air introduced into the air introduction pipe 3 becomes equal to the amount of mixture discharged from the mixture discharge pipe 4. Is done. Next, the internal combustion engine 15 is operated in the predetermined operation mode.

【００１５】内燃機関１５が所定運転モードで運転せし
められている間、排気ガス流量センサ１６が排気管１４
内を流れる排気ガスの流量を検出する。制御回路７は排
気ガス流量センサ１６により検出された排気ガス流量に
比例する量の空気を空気導入管３から採取すべく空気採
取用ポンプ１０を作動し且つ空気採取制御装置９を制御
する。このように空気導入管３から導入される空気の一
部が稀釈管２の上流側で採取されるため、採取された空
気の量に相当する量の排気ガスが排気ガス導入管５を介
して稀釈管２内に導入される。While the internal combustion engine 15 is operated in the predetermined operation mode, the exhaust gas flow sensor 16
Detects the flow rate of exhaust gas flowing inside. The control circuit 7 operates the air sampling pump 10 and controls the air sampling control device 9 to extract from the air introduction pipe 3 an amount of air proportional to the exhaust gas flow rate detected by the exhaust gas flow rate sensor 16. As described above, a part of the air introduced from the air introduction pipe 3 is collected on the upstream side of the dilution pipe 2, so that an amount of exhaust gas corresponding to the amount of the collected air is passed through the exhaust gas introduction pipe 5. It is introduced into the dilution tube 2.

【００１６】排気ガス導入管５を介して導入された排気
ガスは稀釈管２内で空気と混合せしめられる。排気ガス
と空気との混合気は混合気排出管４を介して排気ガス分
析装置に供給される。The exhaust gas introduced via the exhaust gas introduction pipe 5 is mixed with air in the dilution pipe 2. A mixture of exhaust gas and air is supplied to an exhaust gas analyzer via a mixture exhaust pipe 4.

【００１７】通常、大気圧や大気温度の変化により混合
気の排出量や空気の導入量の検出に誤差が生じることが
ある。しかしながら、本発明では混合気排出量センサ１
２の出力が混合気排出量を正確に表しているか否かによ
らず混合気排出量と空気導入量とが等しくなるように制
御される。このため混合気排出量センサ１２の検出誤差
は排気ガス導入量には影響しない。本発明において排気
ガス導入量に影響するのは空気採取制御装置９による空
気採取量の検出誤差のみである。通常、空気の採取量は
混合気の排出量に比べて非常に小さい。このため空気採
取制御装置９の検出誤差の絶対値は非常に小さい。した
がって排気ガス導入量の誤差の絶対値が小さく、排気ガ
ス導入量に対する誤差の割合も小さい。また、従来の排
気ガス分析装置では混合気排出量の検出誤差と空気導入
量の検出誤差とが排気ガス導入量に影響するのに対して
本発明では空気採取量の検出誤差のみが排気ガス導入量
に影響する。したがって本発明によればより正確な量の
排気ガスを稀釈管に導入することができる。Normally, errors may occur in the detection of the amount of air-fuel mixture discharged or the amount of air introduced due to changes in atmospheric pressure or atmospheric temperature. However, in the present invention, the mixture discharge sensor 1
Regardless of whether or not the output of No. 2 accurately represents the mixture discharge amount, control is performed so that the mixture discharge amount and the air introduction amount are equal. Therefore, the detection error of the mixture discharge sensor 12 does not affect the exhaust gas introduction amount. In the present invention, only the detection error of the air sampling amount by the air sampling controller 9 affects the exhaust gas introduction amount. Normally, the amount of air sampled is very small compared to the amount of air-fuel mixture discharged. Therefore, the absolute value of the detection error of the air sampling control device 9 is very small. Therefore, the absolute value of the error of the exhaust gas introduction amount is small, and the ratio of the error to the exhaust gas introduction amount is also small. Further, in the conventional exhaust gas analyzer, the detection error of the air-fuel mixture emission amount and the detection error of the air introduction amount affect the exhaust gas introduction amount, whereas in the present invention, only the detection error of the air sampling amount affects the exhaust gas introduction amount. Affects quantity. Therefore, according to the present invention, a more accurate amount of exhaust gas can be introduced into the dilution pipe.

【００１８】なお、本実施形態では予め定められた量の
混合気を排出するためにオリフィスを用いたが、空気導
入量制御弁６と同じ制御弁を用いてもよい。この場合、
制御弁の開弁量は制御回路７により制御される。In this embodiment, the orifice is used to discharge a predetermined amount of air-fuel mixture. However, the same control valve as the air introduction amount control valve 6 may be used. in this case,
The opening amount of the control valve is controlled by the control circuit 7.

【００１９】[0019]

【発明の効果】本発明の一番目から三番目の発明によれ
ば混合気の排出量の誤差が分析用気体の採取量に影響せ
ず、稀釈用気体の採取量の誤差のみが分析用気体の採取
量に影響する。したがって分析用気体の採取量に影響す
る誤差数が少なく、採取すべき分析用気体の量を正確に
採取することができる。According to the first to third aspects of the present invention, the error in the amount of discharged gas mixture does not affect the amount of the sampled gas for analysis, and only the error in the amount of sampled gas for the dilution is analyzed. Influences the amount of water collected. Therefore, the number of errors that affect the amount of analysis gas to be collected is small, and the amount of analysis gas to be collected can be accurately collected.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の排気ガス稀釈装置を示した図である。FIG. 1 is a view showing an exhaust gas dilution device of the present invention.

【符号の説明】[Explanation of symbols]

１…排気ガス稀釈装置 ２…稀釈管 ３…空気導入管 ４…混合気排出管 ５…排気ガス導入管 ６…空気導入量制御弁 ８…空気採取管 ９…空気採取制御装置 １１…オリフィス １２…混合気排出量センサ DESCRIPTION OF SYMBOLS 1 ... Exhaust gas dilution device 2 ... Dilution tube 3 ... Air introduction tube 4 ... Air-fuel mixture discharge tube 5 ... Exhaust gas introduction tube 6 ... Air introduction amount control valve 8 ... Air sampling tube 9 ... Air sampling control device 11 ... Orifice 12 ... Mixture discharge sensor

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 稀釈用気体を吸入し、該稀釈用気体に予
め定められた量の分析用気体を混入して稀釈し、これら
稀釈用気体と分析用気体との混合気を排出する気体稀釈
装置において、該気体稀釈装置から排出される前記混合
気の量を検出するための混合気量検出手段と、前記吸入
される稀釈用気体の吸入量が前記排出される混合気の排
出量と等しくなるように稀釈用気体の吸入量を制御する
ための稀釈用気体吸入量制御手段と、稀釈用気体から該
稀釈用気体に混入すべき分析用気体の量と等しい量の稀
釈用気体を採取することにより該採取された稀釈用気体
の量と等しい量の分析用気体を稀釈用気体に混入するた
めの稀釈用気体採取手段とを具備することを特徴とする
気体稀釈装置。1. A gas dilution for inhaling a dilution gas, mixing a predetermined amount of an analysis gas into the dilution gas, diluting the mixture, and discharging a mixture of the dilution gas and the analysis gas. In the apparatus, an air-fuel mixture detecting means for detecting the amount of the air-fuel mixture discharged from the gas dilution device, and the suction amount of the sucked dilution gas is equal to the discharge amount of the discharged air-fuel mixture. A diluting gas suction amount control means for controlling the amount of the diluting gas to be sucked, and collecting an amount of the diluting gas equal to the amount of the analysis gas to be mixed into the diluting gas from the diluting gas. A dilution gas collecting means for mixing an analysis gas in an amount equal to the amount of the collected dilution gas into the dilution gas. 【請求項２】 分析用気体を稀釈用気体に混入して稀釈
するための稀釈管と、該稀釈管の一端から稀釈用気体を
導入するための稀釈用気体導入管と、前記分析用気体と
稀釈用気体との混合気を前記稀釈管の他端から排出する
ための分析用気体排出管と、前記稀釈管の両端の間に分
析用気体を導入するための分析用気体導入管とを具備す
る気体稀釈装置において、前記稀釈管に導入される稀釈
用気体の導入量が前記排出される混合気の量と等しくな
るように稀釈用気体の導入量を制御するための制御手段
を具備し、前記稀釈管に導入された稀釈用気体から予め
定められた量の稀釈用気体を採取する稀釈用気体採取管
が前記分析用気体が導入される稀釈管内の位置より稀釈
用気体導入管側に取り付けられることを特徴とする気体
稀釈装置。2. A dilution pipe for mixing and diluting an analysis gas into a dilution gas, a dilution gas introduction pipe for introducing a dilution gas from one end of the dilution pipe, An analysis gas discharge pipe for discharging a mixture with the dilution gas from the other end of the dilution pipe, and an analysis gas introduction pipe for introducing the analysis gas between both ends of the dilution pipe. The gas diluting device includes a control means for controlling the amount of the diluting gas introduced so that the amount of the diluting gas introduced into the dilution pipe is equal to the amount of the discharged air-fuel mixture. A dilution gas sampling tube for collecting a predetermined amount of dilution gas from the dilution gas introduced into the dilution tube is attached to the dilution gas introduction tube side from a position in the dilution tube where the analysis gas is introduced. Gas diluting device, characterized in that 【請求項３】 前記稀釈用気体が空気であり、前記分析
用気体が内燃機関から排出される排気ガスであることを
特徴とする請求項１または２に記載の気体稀釈装置。3. The gas diluting apparatus according to claim 1, wherein the diluting gas is air, and the analyzing gas is exhaust gas discharged from an internal combustion engine.
JP10033123A 1998-02-16 1998-02-16 Gas diluting apparatus Pending JPH11230872A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10033123A JPH11230872A (en) 1998-02-16 1998-02-16 Gas diluting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10033123A JPH11230872A (en) 1998-02-16 1998-02-16 Gas diluting apparatus

Publications (1)

Publication Number Publication Date
JPH11230872A true JPH11230872A (en) 1999-08-27

Family

ID=12377859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10033123A Pending JPH11230872A (en) 1998-02-16 1998-02-16 Gas diluting apparatus

Country Status (1)

Country Link
JP (1) JPH11230872A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011074382A1 (en) * 2009-12-17 2011-06-23 株式会社堀場製作所 Exhaust gas sampling device
CN114247359A (en) * 2020-09-23 2022-03-29 株式会社日立制作所 Mixing system and measuring system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011074382A1 (en) * 2009-12-17 2011-06-23 株式会社堀場製作所 Exhaust gas sampling device
CN102652256A (en) * 2009-12-17 2012-08-29 株式会社堀场制作所 Exhaust gas sampling device
JPWO2011074382A1 (en) * 2009-12-17 2013-04-25 株式会社堀場製作所 Exhaust gas sampling device
CN114247359A (en) * 2020-09-23 2022-03-29 株式会社日立制作所 Mixing system and measuring system
CN114247359B (en) * 2020-09-23 2024-02-27 株式会社日立制作所 Mixing system and measuring system

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