JPH04166608A - Secondary air supply device for engine - Google Patents
Secondary air supply device for engineInfo
- Publication number
- JPH04166608A JPH04166608A JP29446190A JP29446190A JPH04166608A JP H04166608 A JPH04166608 A JP H04166608A JP 29446190 A JP29446190 A JP 29446190A JP 29446190 A JP29446190 A JP 29446190A JP H04166608 A JPH04166608 A JP H04166608A
- Authority
- JP
- Japan
- Prior art keywords
- secondary air
- engine
- passage
- catalyst
- 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
Links
- 239000003054 catalyst Substances 0.000 claims abstract description 70
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 29
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 9
- 230000003197 catalytic effect Effects 0.000 abstract 4
- 229910052703 rhodium Inorganic materials 0.000 abstract 2
- 239000010948 rhodium Substances 0.000 abstract 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 abstract 2
- 238000010792 warming Methods 0.000 abstract 2
- 239000000446 fuel Substances 0.000 description 20
- 230000001133 acceleration Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241001590997 Moolgarda engeli Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はエンジンの２次空気供給装置に係り、特に吸
気系と排気系とを連絡し、排気系に２次空気を供給する
２次空気通路を有するエンジンの２次空気供給装置に関
する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a secondary air supply device for an engine, and in particular to a secondary air supply device that connects an intake system and an exhaust system and supplies secondary air to the exhaust system. The present invention relates to a secondary air supply device for an engine having a passage.
車両のエンジンにおいては、運転条件の変動が大きく、
また急激である。このような運転条件に適合し、しかも
燃料消費率や排気有害成分値を低減させるために、空燃
比を適正に調整する必要がある。このような適正な空燃
比に調整する装置として、２次空気供給装置がある。２
次空気供給装置は、エンジンの排気系に排気中の排気濃
度を検出する０２センサを設け、この０２センサの検出
信号を制御部に入力し、この制御部によって吸気系ある
いは排気系に供給する２次空気をフィードバックして制
御することにより、空燃比を所定に調整するものである
。Vehicle engines are subject to large fluctuations in operating conditions.
It is also sudden. In order to meet such operating conditions and to reduce the fuel consumption rate and the value of harmful exhaust gas components, it is necessary to appropriately adjust the air-fuel ratio. There is a secondary air supply device as a device for adjusting such an appropriate air-fuel ratio. 2
The secondary air supply device is equipped with an 02 sensor that detects the concentration of exhaust gas in the exhaust system of the engine, inputs the detection signal of this 02 sensor to a control unit, and supplies the secondary air to the intake system or exhaust system by this control unit. The air-fuel ratio is adjusted to a predetermined value by feeding back and controlling the secondary air.
また、触媒付燃料噴射式エンジンとしては、特開昭６１
−２４７８１０号公報に開示される如く、エンジンの運
転状態がエンジンの回転数と負荷の関係であらかじめ設
定されたフィードバック制御領域にあるか否かを判断す
る判別手段と、エンジンの加速を検知する加速検知手段
と、判別手段と加速検知手段とに基づきフィードバック
制’ａ ｆｉＩ域からの加速に所定時間２次エア導入部
より２次エアを供給するとともに、フィードバック制御
を継続そせる加速補正手段を設けたものがあった。In addition, as a fuel injection type engine with a catalyst, JP-A-61
As disclosed in Japanese Patent No. 247810, there is provided a determination means for determining whether the operating state of the engine is within a preset feedback control region based on the relationship between the engine rotation speed and the load, and an acceleration for detecting the acceleration of the engine. Feedback control is provided based on the detection means, the discrimination means, and the acceleration detection means.Acceleration correction means is provided for supplying secondary air from the secondary air introducing portion for a predetermined period of time for acceleration from the fiI region and for continuing feedback control. There was something.
更に、内燃機関の２次空気導入装置としては、実開昭６
１−１０５７１２号公報に開示される如く、２次空気導
入通路に制御弁を設けるとともに、機関温度を検出する
機関温度検出手段と、始動後の時間を計測するタイマ手
段と、機関温度が所定値以下の条件及び始動後所定時間
内のうちの少なくとも１つの条件が成立したときに２次
空気を導入するよう制御弁の作動を制御する制御弁制御
手段とを設けたものがあった。Furthermore, as a secondary air introduction device for internal combustion engines,
As disclosed in Publication No. 1-105712, a control valve is provided in the secondary air introduction passage, and an engine temperature detection means for detecting the engine temperature, a timer means for measuring the time after starting, and a control valve for detecting the engine temperature at a predetermined value. Some devices are equipped with a control valve control means that controls the operation of the control valve to introduce secondary air when at least one of the following conditions and a predetermined time after startup is satisfied.
更にまた、エンジンの２次空気供給装置とじては、実開
昭６１−１３４５１５号公報に開示される如く、２次空
気を取入れる２次空気取入手段と、２次空気取入手段に
より取入れられた２次空気をエンジンの排気マニホール
ド内に供給する排気マニホールド側供給手段と、２次空
気取入手段により取入れられた２次空気を各触媒間の空
間に供給する空間側供給手段と、エンジン冷間時は、排
気マニホールド側供給手段により２次空気が供給され、
エンジン暖機後は空間側供給手段により２次空気が供給
されるように、エンジンの温度情報により排気マニホー
ルド側供給手段と空間側供給手段とを切換制御する温度
切換制御手段とを備えたものがあった。Furthermore, as disclosed in Japanese Utility Model Application No. 61-134515, the secondary air supply device for the engine includes a secondary air intake means for taking in secondary air, and a secondary air intake means for taking in the secondary air. an exhaust manifold side supply means for supplying the secondary air taken into the exhaust manifold of the engine; a space side supply means for supplying the secondary air taken in by the secondary air intake means to the space between each catalyst; When cold, secondary air is supplied by the exhaust manifold side supply means,
The device is equipped with a temperature switching control means that switches between the exhaust manifold side supply means and the space side supply means based on engine temperature information so that secondary air is supplied by the space side supply means after the engine warms up. there were.
また、内燃機関の２次空気導入装置としては、実開昭６
１−１８４８１３号公報に開示される如く、２個の触媒
を直列に有する内燃機関排気系の２次空気導入装置にお
いて、触媒前に空気を導入する第１の通路と、触媒間に
空気を導入する第２の通路とを設け、第１の通路に機関
温度に関して導入空気量を制御する弁装置を設けたもの
があった。In addition, as a secondary air introduction device for internal combustion engines,
As disclosed in Publication No. 1-184813, in a secondary air introduction device for an internal combustion engine exhaust system having two catalysts in series, there is a first passage for introducing air before the catalyst, and a first passage for introducing air between the catalysts. Some engines have a second passage that controls the engine temperature, and a valve device that controls the amount of air introduced in relation to the engine temperature in the first passage.
ところで、従来のエンジンには、排気系に三元触媒であ
る第１、第２触媒を２段に、つまり、直列に配設したも
のや、酸化触媒である第１、第２触媒を２段に配設する
とともに、吸気系に排気の一部を還流することにより、
吸気を希釈し、火炎伝播速度や燃料最高温度を低下させ
、排気中のＮＯｘを低減させるＥＧＲ装置を設けたもの
があった。By the way, conventional engines include those in which the first and second catalysts, which are three-way catalysts, are arranged in two stages, that is, in series, in the exhaust system, and the first and second catalysts, which are oxidation catalysts, are arranged in two stages. By placing a part of the exhaust gas back into the intake system,
Some were equipped with an EGR device that dilutes the intake air, lowers the flame propagation speed and maximum fuel temperature, and reduces NOx in the exhaust.
この結果、前述したものは、高価である３元触媒を２個
も使用しているため、エンジンの製造コストの増加を招
き、経済的に不利であるという不都合があった。As a result, the above-mentioned engine uses two expensive three-way catalysts, which increases the manufacturing cost of the engine and is economically disadvantageous.
また、ベース空燃比を理論空燃比に近づけなければなら
ず、サージ等が発生し易くなり、ドライバビリティの悪
化を引き起こし、実用上不利であるという不都合があっ
た。In addition, the base air-fuel ratio must be brought close to the stoichiometric air-fuel ratio, which tends to cause surges and the like, resulting in deterioration of drivability, which is disadvantageous in practice.
更に、後述したものは、排気中のＮＯｘの還元をＥＧＲ
装置によって行っているため、ドライバビリティの悪化
を引き起こし、実用上不利であるという不都合があった
。Furthermore, the method described below reduces NOx in the exhaust gas using EGR.
Since this is done by a device, there is a disadvantage in that it causes deterioration in drivability and is disadvantageous in practice.
そこでこの発明の目的は、上述不都合を除去するために
、２次空気通路途中に２次空気用ポンプを設け、排気系
に酸化触媒と三元触媒を順次配設するとともに２次空気
通路下流側を分岐させて酸化触媒及び三元触媒よりも上
流側の排気系に連絡して設け、２次空気通路のポンプ下
流側且つ分岐部位よりも上流側に２次空気量を調整する
調整弁を設け、酸化触媒及び三元触媒間の排気系に排気
ガスの濃度を検出する濃度センサを設け、２次空気通路
の分岐部位に切換弁を設け、エンジンの運転状態に応じ
て２次空気の供給箇所を切換えるべく切換弁を制御する
とともに濃度センサからの検出信号により調整弁を動作
させ２次空気供給量をフィードバック制御する制御部を
設けたことにより、ベース空燃比を理論空燃比に対して
リンチにでき、ドライバビリティを良好状態に維持し得
るとともに、排気有害成分値を悪化させることなく安価
な触媒を使用し、エンジンの製造コストを低減できるエ
ンジンの２次空気供給装置を実現するにある。Therefore, an object of the present invention is to provide a secondary air pump in the middle of the secondary air passage, to sequentially arrange an oxidation catalyst and a three-way catalyst in the exhaust system, and to eliminate the above-mentioned disadvantages. A regulating valve for adjusting the amount of secondary air is provided downstream of the pump in the secondary air passage and upstream of the branch point. A concentration sensor is installed in the exhaust system between the oxidation catalyst and the three-way catalyst to detect the concentration of exhaust gas, and a switching valve is installed at the branch point of the secondary air passage to adjust the supply point of the secondary air according to the operating state of the engine. The base air-fuel ratio can be kept close to the stoichiometric air-fuel ratio by providing a control unit that controls the switching valve to switch the air-fuel ratio and operates the adjustment valve based on the detection signal from the concentration sensor to feedback-control the secondary air supply amount. To provide a secondary air supply device for an engine that can maintain good drivability, use an inexpensive catalyst without deteriorating the value of harmful exhaust gas components, and reduce the manufacturing cost of the engine.
この目的を達成するためにこの発明は、吸気系と排気系
とを連絡し排気系に２次空気を供給する２次空気通路を
有するエンジンの２次空気供給装置において、前記２次
空気通路途中に２次空気用ポンプを設け、排気系に酸化
触媒と三元触媒を順次配設するとともに前記２次空気通
路下流側を分岐させて酸化触媒及び三元触媒よりも上流
側の排気系に連絡して設け、２次空気通路のポンプ下流
側且つ分岐部位よりも上流側に２次空気量を調整する調
整弁を設け、酸化触媒及び三元触媒間の排気系に排気ガ
スの濃度を検出する濃度センサを設け、前記２次空気通
路の分岐部位に切換弁を設け、前記エンジンの運転状態
に応じて２次空気の供給箇所を切換えるべく切換弁を制
御するとともに前記濃度センサからの検出信号により前
記調整弁を動作させ２次空気供給量をフィードバック制
御する制御部を設けたことを特徴とする。To achieve this object, the present invention provides a secondary air supply device for an engine having a secondary air passage that connects an intake system and an exhaust system and supplies secondary air to the exhaust system. A secondary air pump is provided in the exhaust system, an oxidation catalyst and a three-way catalyst are sequentially arranged in the exhaust system, and the downstream side of the secondary air passage is branched to connect to the exhaust system upstream of the oxidation catalyst and three-way catalyst. A regulating valve for adjusting the amount of secondary air is provided downstream of the pump in the secondary air passageway and upstream of the branch point, and the concentration of exhaust gas is detected in the exhaust system between the oxidation catalyst and the three-way catalyst. A concentration sensor is provided, a switching valve is provided at a branch point of the secondary air passage, and the switching valve is controlled to switch the supply point of the secondary air according to the operating state of the engine, and the detection signal from the concentration sensor is used to control the switching valve. The present invention is characterized in that a control section is provided for operating the regulating valve to feedback-control the amount of secondary air supplied.
上述の如（構成したことにより、エンジンの冷機時には
、切換弁が作動して２次空気通路が酸化触媒よりも上流
側の排気系に連絡され、２次空気量を調整する調整弁が
全開状態となり、２次空気用ポンプによって酸化触媒の
上流側にのみ２次空気が供給される。As described above, when the engine is cold, the switching valve operates and the secondary air passage is connected to the exhaust system upstream of the oxidation catalyst, and the regulating valve that adjusts the amount of secondary air is fully open. Therefore, secondary air is supplied only to the upstream side of the oxidation catalyst by the secondary air pump.
また、エンジンの暖機時には、切換弁が作動し、２次空
気通路が三元触媒よりも上流側の排気系に連絡され、調
整弁がデユーティ制御され、２次空気用ポンプによって
第２触媒の上流側にのみ所定量の２次空気が供給される
。Also, when the engine is warmed up, the switching valve operates, the secondary air passage is connected to the exhaust system upstream of the three-way catalyst, the regulating valve is duty-controlled, and the secondary air pump operates the second catalyst. A predetermined amount of secondary air is supplied only to the upstream side.
以下図面に基づいてこの発明の実施例を詳細に説明する
。Embodiments of the present invention will be described in detail below based on the drawings.
第１．２図はこの発明の実施例を示すものである。第１
図において、２はエンジン、４はエアクリーナ、６は吸
気通路である。前記エンジン２は、エアクリーナ４から
取り入れた空気に図示しない気化器内で燃料を混合して
混合気を生成し、この混合気を図示しない絞り弁により
調量して吸気通路６により供給されている。Figure 1.2 shows an embodiment of the invention. 1st
In the figure, 2 is an engine, 4 is an air cleaner, and 6 is an intake passage. The engine 2 generates an air-fuel mixture by mixing air taken in from an air cleaner 4 with fuel in a carburetor (not shown), meters the air-fuel mixture with a throttle valve (not shown), and supplies the air-fuel mixture through an intake passage 6. .
また、前記エンジン２において燃焼生成された排気は、
排気通路８を介して外気に排出されている。Furthermore, the exhaust gas generated by combustion in the engine 2 is
It is exhausted to the outside air via the exhaust passage 8.
前記吸気通路６と排気通路８とは、エンジン２をバイパ
スして前記吸気通路６側から排気通路８側へ２次空気を
供給する２次空気通路１０により連絡されている。The intake passage 6 and the exhaust passage 8 are connected by a secondary air passage 10 that bypasses the engine 2 and supplies secondary air from the intake passage 6 side to the exhaust passage 8 side.
更に、前記２次空気通路１０途中に２次空気用ポンプ１
２を設け、の排気通路８に酸化触媒である第１触媒１４
と三元触媒である第２触媒１６とを順次配設するととも
に、前記２次空気通路１０下流側を分岐させて第１、第
２触媒１４．１６よりも上流側の排気通路８に連絡して
設ける。また、２次空気通路１０のポンプ１２下流側且
つ分岐部位よりも上流側に２次空気量を調整する調整弁
１８を設け、第１、第２触媒１４．１６間の排気通路８
に排気ガスの濃度を検出する濃度センサである０２セン
サ２０を設け、前記２次空気通路１゜の分岐部位に切換
弁２２を設ける。そして、前記エンジン２の運転状態に
応じて２次空気の供給箇所を切換えるべく切換弁２２を
制御するとともに前記０２センサ２０からの検出信号に
より前記調整弁１８を動作させ２次空気供給量をフィー
ドバック制御する制御部２４を設ける構成とする。Further, a secondary air pump 1 is installed in the middle of the secondary air passage 10.
2, and a first catalyst 14 which is an oxidation catalyst is provided in the exhaust passage 8 of the
and a second catalyst 16, which is a three-way catalyst, are sequentially arranged, and the downstream side of the secondary air passage 10 is branched to communicate with the exhaust passage 8 upstream of the first and second catalysts 14.16. Provided. Further, a regulating valve 18 for adjusting the amount of secondary air is provided downstream of the pump 12 in the secondary air passage 10 and upstream of the branching part, and an adjustment valve 18 is provided in the secondary air passage 10 to adjust the amount of secondary air.
An 02 sensor 20, which is a concentration sensor for detecting the concentration of exhaust gas, is provided in the exhaust gas, and a switching valve 22 is provided at a branch point of the secondary air passage 1°. Then, the switching valve 22 is controlled to switch the supply point of secondary air according to the operating state of the engine 2, and the adjustment valve 18 is operated based on the detection signal from the 02 sensor 20, and the secondary air supply amount is fed back. The configuration is such that a control section 24 is provided for control.
前記排気通路８を形成する第１排気通路８−１によって
エンジン２の排気側と大なる容量の酸化触媒である第１
触媒１４の上流側を連絡し、この第１触媒１４の下流側
と小なる容量の三元触媒である第２触媒１６の上流側と
を第２排気通路８−２によって連絡し、この第２触媒Ｉ
６の下流側に第３排気通路８−３を連絡している。The first exhaust passage 8-1 forming the exhaust passage 8 connects the exhaust side of the engine 2 with a first oxidation catalyst having a large capacity.
The upstream side of the catalyst 14 is connected, and the downstream side of the first catalyst 14 is connected with the upstream side of the second catalyst 16, which is a three-way catalyst with a small capacity, through a second exhaust passage 8-2. Catalyst I
A third exhaust passage 8-3 is connected to the downstream side of the exhaust passage 6.
また、２次空気通路１０の上流端開口部２６をエアクリ
ーナ直下流側部位に吸気通路６に連絡する。この２次空
気通路１０の下流側部位を分岐させて設け、第１下流端
開口部２８を第１触媒１４の上流側である第１排気通１
ｍ８−１に連絡するとともに、第２下流端開口部３０を
第２触媒１６の上流である第２排気通路８−２に連絡す
る。Further, the upstream end opening 26 of the secondary air passage 10 is connected to the intake passage 6 at a position immediately downstream of the air cleaner. The downstream part of the secondary air passage 10 is branched, and the first downstream end opening 28 is connected to the first exhaust passage 1 which is upstream of the first catalyst 14.
m8-1, and the second downstream end opening 30 is connected to the second exhaust passage 8-2, which is upstream of the second catalyst 16.
更に、前記２次空気通路１０途中である上流部位に２次
空気用ポンプ１２を設け、この２次空気通路１０の分岐
部位に２次空気の供給箇所を切換える切換弁２２を設け
、前記ポンプ１２と切換弁２２との間に２次空気量を調
整する調整弁１８を設ける。前記切換弁２２は、第１接
続部材３２によって制御部２４に接続するとともに、前
記調整弁１８を第２接続部材３４によって制御部２４に
接続する。Further, a secondary air pump 12 is provided at an upstream portion in the middle of the secondary air passage 10, and a switching valve 22 for switching a secondary air supply point is provided at a branch portion of the secondary air passage 10. A regulating valve 18 for adjusting the amount of secondary air is provided between the switching valve 22 and the switching valve 22. The switching valve 22 is connected to the control section 24 through a first connection member 32, and the regulating valve 18 is connected to the control section 24 through a second connection member 34.
更にまた、前記第２排気通路８−１に連絡された２次空
気通路１０の第２下流端開口部３０直下流部位に０２セ
ンサ２０を設け、この０２センサ２０を第３接続部材３
６によって制御部２４に接続する。Furthermore, an 02 sensor 20 is provided immediately downstream of the second downstream end opening 30 of the secondary air passage 10 connected to the second exhaust passage 8-1, and this 02 sensor 20 is connected to the third connecting member 3.
6 is connected to the control unit 24.
次に前記エンジン２の２次空気供給装置用フローチャー
トに沿って作用を説明する。Next, the operation will be explained along with a flowchart for the secondary air supply device of the engine 2.
前記エンジン２が駆動することにより、２次空気供給装
置用フローチャートのプログラムがスタート （１００
）する。When the engine 2 is driven, the program of the flowchart for the secondary air supply device starts (100
)do.
そして、エンジン２の冷却水温度（ＴＨＷ）が定数Ａよ
りも大となったか否かの判断（１０２）を行う。この判
断（１０２）がＮｏ （つまり、エンジンの冷機時）の
場合には、制御部２４によって切換弁２２を作動し、２
次空気通路１０下流側を第１触媒１４上流側に連絡する
（１０４）。その後に調整弁１８を全開にする（１０６
）。Then, it is determined whether the cooling water temperature (THW) of the engine 2 has become greater than the constant A (102). If this judgment (102) is No (that is, when the engine is cold), the control unit 24 operates the switching valve 22, and
The downstream side of the secondary air passage 10 is connected to the upstream side of the first catalyst 14 (104). After that, fully open the regulating valve 18 (106
).
また、前記判断（１０２）がＹＥＳ （つまり、エンジ
ンの暖機時）の場合には、制御部２４によって切換弁２
２を作動し、２次空気通路１０下流側を第２触媒１６上
流側に連絡する（１０８）。Further, if the judgment (102) is YES (that is, when the engine is warmed up), the control section 24 controls the switching valve 2.
2 to connect the downstream side of the secondary air passage 10 to the upstream side of the second catalyst 16 (108).
その後に調整弁１８の開度をデユーティ制御する（１０
６）。Thereafter, the opening degree of the regulating valve 18 is duty-controlled (10
6).
つまり、前記制御部２４は、エンジン２のスタート直後
等の冷機時にベース空燃比をリッチとし、多量の２次空
気を第１触媒１４上流側に供給している。前記エンジン
２の暖機時には、調整弁１８のデユーティ制御による０
２フイードバツク制御によって２次空気を第１触媒１４
下流側である第２触媒１６上流にのみ供給し、前記第１
触媒１４によって排気のＣ０１ＨＣを抑え、第２触媒１
６によってＮＯｘ、ＣＯ，ＨＣの流出を抑えている。That is, the control unit 24 makes the base air-fuel ratio rich when the engine 2 is cold, such as immediately after starting, and supplies a large amount of secondary air to the upstream side of the first catalyst 14. When the engine 2 is warmed up, the duty control of the regulating valve 18
2 Feedback control directs secondary air to the first catalyst 14.
It is supplied only upstream of the second catalyst 16, which is the downstream side, and the first
The catalyst 14 suppresses CO1HC in the exhaust gas, and the second catalyst 1
6 suppresses the outflow of NOx, CO, and HC.
これにより、ベース空燃比を理論空燃比に対してリッチ
にでき、ドライバビリティを良好状態に維持し得て、実
用上有利である。Thereby, the base air-fuel ratio can be made richer than the stoichiometric air-fuel ratio, and drivability can be maintained in a good state, which is advantageous in practice.
また、排気を浄化できることにより、排気有害成分値を
悪化させることなく、安価な酸化触媒をメインとしつつ
小容量の三元触媒を使用でき、製造コストを低減し得て
、経済的に有利である。In addition, by being able to purify the exhaust gas, it is possible to use a small-capacity three-way catalyst while mainly using an inexpensive oxidation catalyst without worsening the values of harmful exhaust gas components, reducing manufacturing costs and being economically advantageous. .
更に、２次空気供給装置の使用により、従来使用してい
たＥＧＲ装置が不要となり、エンジン２の製造コストを
低減できるとともに、構成を簡略化し得る。Furthermore, by using the secondary air supply device, the conventionally used EGR device becomes unnecessary, and the manufacturing cost of the engine 2 can be reduced and the configuration can be simplified.
以上詳細に説明した如くこの発明によれば、２次空気通
路途中に２次空気用ポンプを設け、排気系に酸化触媒と
三元触媒を順次配設するとともに２次空気通路下流側を
分岐させて酸化触媒及び三元触媒よりも上流側の排気系
に連絡して設け、２次空気通路のポンプ下流側且つ分岐
部位よりも上流側に２次空気量を調整する調整弁を設け
、酸化触媒及び三元触媒間の排気系に排気ガスの濃度を
検出する濃度センサを設け、２次空気通路の分岐部位に
切換弁を設け、エンジンの運転状態に応じて２次空気の
供給箇所を切換えるべく切換弁を制御するとともに濃度
センサからの検出信号により調整弁を動作させ２次空気
供給量をフィードバック制御する制御部を設けたので、
ベース空燃比を理論空燃比に対してリッチにでき、ドラ
イバビリティを良好状態に維持し得て、実用上有利であ
るとともに、排気有害成分値を悪化させることなく安価
な触媒を使用でき、製造コストを低減し得て、経済的に
有利である。As explained in detail above, according to the present invention, a secondary air pump is provided in the middle of the secondary air passage, an oxidation catalyst and a three-way catalyst are sequentially arranged in the exhaust system, and the downstream side of the secondary air passage is branched. The oxidation catalyst and the three-way catalyst are connected to the exhaust system upstream of the oxidation catalyst and the three-way catalyst, and a regulating valve for adjusting the amount of secondary air is provided downstream of the pump and upstream of the branch point in the secondary air passage. A concentration sensor that detects the concentration of exhaust gas is installed in the exhaust system between the three-way catalyst and the three-way catalyst, and a switching valve is installed at the branch point of the secondary air passage to switch the secondary air supply point according to the operating condition of the engine. A control unit that controls the switching valve and operates the adjustment valve based on the detection signal from the concentration sensor to feedback control the amount of secondary air supply is provided.
The base air-fuel ratio can be made richer than the stoichiometric air-fuel ratio, and drivability can be maintained in good condition, which is advantageous in practical terms.In addition, an inexpensive catalyst can be used without deteriorating the value of harmful exhaust components, and manufacturing costs are reduced. can be reduced, which is economically advantageous.
第１．２図はこの発明の実施例を示し、第１図はエンジ
ンの２次空気供給装置の概略説明図、第２図はエンジン
の２次空気供給装置のフローチャートである。
図において、２はエンジン、４はエアクリーナ、６は吸
気通路、８は排気通路、１０は２次空気通路、１２は２
次空気用ポンプ、１４は第１触媒、１６は第２触媒、１
８は調整弁、２０は０２センサ、２２は切換弁、２４は
制御部、２６は上流端開口部、２８は第１下流端開口部
、３０は第２下流端開口部、３２は第１接続部材、３４
は第２接続部材、３６は第３接続部材である。
特 許 出願人 スズキ 株 式 会 杜氏
理 人 弁理士 西 郷 義 美図面の浄書
第１図
第２図
手続補正書（７創
平成２年１２月２０日
３、補正をする者
事件との関係 特許出願人
住 所 静岡県浜名郡可美村高塚３００番地名称（２
０８）スズキ株式会社
４、代 理 人 〒１０１ ７ＥＬ ０３−２９２−
４４１１ （代表）住 所 東京都千代田区神田小
川町２丁目８番地ｊ”ｍ＊＊ ｂ ｘ 、ｒ、、
、、。
氏名 （８００５）弁理士西多部義美１５、補正命令の
日付 自発 ゝ １′−６、
補正の対象
＋１１ 正式図面を提出する。1.2 shows an embodiment of the present invention, FIG. 1 is a schematic explanatory diagram of a secondary air supply system for an engine, and FIG. 2 is a flowchart of the secondary air supply system for an engine. In the figure, 2 is the engine, 4 is the air cleaner, 6 is the intake passage, 8 is the exhaust passage, 10 is the secondary air passage, and 12 is the 2
secondary air pump, 14 is the first catalyst, 16 is the second catalyst, 1
8 is a regulating valve, 20 is an 02 sensor, 22 is a switching valve, 24 is a control unit, 26 is an upstream end opening, 28 is a first downstream end opening, 30 is a second downstream end opening, 32 is a first connection member, 34
36 is a second connecting member, and 36 is a third connecting member. Patent applicant: Suzuki Co., Ltd. Chief brewer
Patent Attorney Yoshimi Saigo Engraving of drawings Figure 1 Figure 2 Procedural amendment (7th edition, December 20, 1990, 3, Relationship to the case of the person making the amendment Patent applicant's address Hamana-gun, Shizuoka Prefecture OK) Mimura Takatsuka 300 address name (2
08) Suzuki Motor Corporation 4, Agent 101 7EL 03-292-
4411 (Representative) Address 2-8 Kanda Ogawamachi, Chiyoda-ku, Tokyo j”m** b x , r, ,
,,. Name (8005) Patent attorney Yoshimi Nishitabe 15, Date of amendment order Voluntary ゝ 1'-6,
Target of amendment +11 Submit formal drawings.
Claims (1)
する２次空気通路を有するエンジンの２次空気供給装置
において、前記２次空気通路途中に２次空気用ポンプを
設け、排気系に酸化触媒と三元触媒を順次配設するとと
もに前記２次空気通路下流側を分岐させて酸化触媒及び
三元触媒よりも上流側の排気系に連絡して設け、２次空
気通路のポンプ下流側且つ分岐部位よりも上流側に２次
空気量を調整する調整弁を設け、酸化触媒及び三元触媒
間の排気系に排気ガスの濃度を検出する濃度センサを設
け、前記２次空気通路の分岐部位に切換弁を設け、前記
エンジンの運転状態に応じて２次空気の供給箇所を切換
えるべく切換弁を制御するとともに前記濃度センサから
の検出信号により前記調整弁を動作させ２次空気供給量
をフィードバック制御する制御部を設けたことを特徴と
するエンジンの２次空気供給装置。1. In a secondary air supply device for an engine having a secondary air passage that connects an intake system and an exhaust system and supplies secondary air to the exhaust system, a secondary air pump is provided in the middle of the secondary air passage, An oxidation catalyst and a three-way catalyst are sequentially arranged in the exhaust system, and the downstream side of the secondary air passage is branched and connected to the exhaust system upstream of the oxidation catalyst and the three-way catalyst, and the secondary air passage is A regulating valve for adjusting the amount of secondary air is provided on the downstream side of the pump and upstream of the branching part, and a concentration sensor for detecting the concentration of exhaust gas is provided in the exhaust system between the oxidation catalyst and the three-way catalyst. A switching valve is provided at a branch point of the passage, and the switching valve is controlled to switch the supply point of secondary air according to the operating state of the engine, and the regulating valve is operated by the detection signal from the concentration sensor to control the secondary air supply. A secondary air supply device for an engine, characterized in that it is provided with a control section that performs feedback control of the supply amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29446190A JPH04166608A (en) | 1990-10-31 | 1990-10-31 | Secondary air supply device for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29446190A JPH04166608A (en) | 1990-10-31 | 1990-10-31 | Secondary air supply device for engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04166608A true JPH04166608A (en) | 1992-06-12 |
Family
ID=17808082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29446190A Pending JPH04166608A (en) | 1990-10-31 | 1990-10-31 | Secondary air supply device for engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04166608A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002227639A (en) * | 2001-01-30 | 2002-08-14 | Denso Corp | Control device for internal combustion engine |
-
1990
- 1990-10-31 JP JP29446190A patent/JPH04166608A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002227639A (en) * | 2001-01-30 | 2002-08-14 | Denso Corp | Control device for internal combustion engine |
| JP4604361B2 (en) * | 2001-01-30 | 2011-01-05 | 株式会社デンソー | Control device for internal combustion engine |
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