JP2674842B2 - Control method of boost pressure control valve - Google Patents

Control method of boost pressure control valve

Info

Publication number
JP2674842B2
JP2674842B2 JP1272416A JP27241689A JP2674842B2 JP 2674842 B2 JP2674842 B2 JP 2674842B2 JP 1272416 A JP1272416 A JP 1272416A JP 27241689 A JP27241689 A JP 27241689A JP 2674842 B2 JP2674842 B2 JP 2674842B2
Authority
JP
Japan
Prior art keywords
control valve
frequency
pressure control
supercharging pressure
pressure
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
Application number
JP1272416A
Other languages
Japanese (ja)
Other versions
JPH03134228A (en
Inventor
淳 佐々木
篤 伊藤
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.)
Daihatsu Motor Co Ltd
Original Assignee
Daihatsu Motor Co Ltd
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 Daihatsu Motor Co Ltd filed Critical Daihatsu Motor Co Ltd
Priority to JP1272416A priority Critical patent/JP2674842B2/en
Publication of JPH03134228A publication Critical patent/JPH03134228A/en
Application granted granted Critical
Publication of JP2674842B2 publication Critical patent/JP2674842B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、排気タービン過給機を備えた自動車等のエ
ンジンに好適に採用可能な過給圧制御弁の制御方法に関
する。
Description: TECHNICAL FIELD The present invention relates to a control method of a supercharging pressure control valve that can be suitably adopted for an engine of an automobile or the like equipped with an exhaust turbine supercharger.

[従来の技術] 排気リリーフ方式を採用する排気タービン過給機で
は、ウェイストゲートバルブを開閉するアクチュエータ
のセンシングポートとコンプレッサ下流側の吸気通路と
が導圧通路を介して連通しているため、吸気弁の開閉動
作等によって吸気管内に発生した吸気脈動が前記センシ
ングポートから圧力室に作用し、ウェストゲートバルブ
を誤動作させる恐れがある。このため、本発明の先行技
術として、例えば、実開昭62−145943号公報に示される
ように、導圧通路に共鳴室や膨脹室を設けて、吸気脈動
が圧力室に作用するのを抑制するようにしているものも
ある。
[Prior Art] In an exhaust turbine supercharger that adopts an exhaust relief system, the sensing port of the actuator that opens and closes the waste gate valve and the intake passage on the downstream side of the compressor communicate with each other through a pressure guiding passage. The intake pulsation generated in the intake pipe due to the opening / closing operation of the valve may act on the pressure chamber from the sensing port, and may cause the wastegate valve to malfunction. Therefore, as a prior art of the present invention, for example, as shown in Japanese Utility Model Laid-Open No. 62-145943, a resonance chamber or an expansion chamber is provided in the pressure guiding passage to suppress intake pulsation from acting on the pressure chamber. There are also things I try to do.

また、導圧通路に過給圧制御弁を設けておき、その過
給圧制御弁をデューティ制御して、前記アクチュエータ
に導く過給圧のリーク量を調節することにより、エンジ
ンの運転状況に応じて吸入空気の過給圧を制御するよう
に構成したものもある。このような構成のものでは、過
給圧制御弁に印加される駆動電圧の周波数が、通常、20
Hzで、一定となっている。
In addition, a boost pressure control valve is provided in the pressure guide passage, and the boost pressure control valve is duty-controlled to adjust the leak amount of the boost pressure to be guided to the actuator, so that it can be adjusted according to the operating condition of the engine. There is also a configuration in which the supercharging pressure of intake air is controlled. With such a configuration, the frequency of the drive voltage applied to the boost pressure control valve is usually 20
It is constant at Hz.

[発明が解決しようとする課題] ところが、過給圧制御弁に印加される駆動電圧の周波
数が常に一定であると、駆動電圧の周波数と吸気脈動と
が共振する運転領域が生じ、その運転領域でアクチュエ
ータにかかる過給圧の変動が過大となる。例えば、第4
図に示すように、よく利用されている20Hzの周波数でも
って過給圧制御弁をデューティ制御すると、エンジン回
転数NEが約2400rpmをピークにその前後領域でアクチュ
エータのセンシングポートにかかる過給圧の振れ量(ブ
ースト振れ量)が過大になり、吸入空気の過給圧が安定
しないという不具合がある。一方、第5図に示すよう
に、30Hzの周波数でもって過給圧制御弁をデューティ制
御すると、エンジン回転数NEが約3600rpmをピークにそ
の前後領域でアクチュエータのセンシングポートにかか
る過給圧の振れ量(ブースト振れ量)が過大になり、吸
入空気の過給圧が乱れる。
[Problems to be Solved by the Invention] However, if the frequency of the drive voltage applied to the supercharging pressure control valve is always constant, an operating region where the frequency of the drive voltage and the intake pulsation resonate occurs, and the operating region Therefore, the fluctuation of the boost pressure applied to the actuator becomes excessive. For example, the fourth
As shown in the figure, when the boost pressure control valve is duty-controlled at the frequently used frequency of 20 Hz, the engine speed NE peaks at about 2400 rpm and the boost pressure applied to the sensing port of the actuator in the region before and after that peak There is a problem that the amount of shake (boost shake amount) becomes too large and the supercharging pressure of the intake air is not stable. On the other hand, as shown in Fig. 5, when the boost pressure control valve is duty-controlled at a frequency of 30 Hz, the engine speed NE peaks at about 3600 rpm and the fluctuation of the boost pressure applied to the sensing port of the actuator in the front and rear regions. The amount (boost shake amount) becomes excessive and the supercharging pressure of the intake air is disturbed.

また、仮に、吸気脈動との共振を回避し得る駆動電圧
の周波数を見出だせても、その周波数が過給圧制御弁の
制御に通常利用される周波数よりも大巾に低い周波数で
あると、過給圧制御弁の開閉に伴って導圧通路に圧力変
動が発生し、その圧力変動がアクチュエータに作用し
て、ウェイストゲートバルブをばたつかせる恐れが高く
なる。しかも、このような方策では、過給圧制御弁の性
能を十分に発揮させるのが困難になり、制御遅れを招き
易い。一方、駆動電圧の周波数が過給圧制御弁の制御に
通常利用される周波数よりも大巾に高い周波数である
と、過給圧制御弁自体の耐久性を低下させ易く、信頼性
の面等から採用し難い。
Further, even if a frequency of the drive voltage that can avoid resonance with intake pulsation is found, the frequency is significantly lower than the frequency normally used for control of the boost pressure control valve. As the supercharging pressure control valve is opened and closed, pressure fluctuations occur in the pressure guiding passage, and the pressure fluctuations act on the actuator, increasing the risk of flapping the wastegate valve. Moreover, with such a measure, it is difficult to sufficiently bring out the performance of the boost pressure control valve, and control delay is likely to occur. On the other hand, when the frequency of the drive voltage is much higher than the frequency normally used for controlling the boost pressure control valve, the durability of the boost pressure control valve itself is likely to be lowered, and the reliability is improved. It is difficult to adopt from.

本発明は、このような不具合を解消することを目的と
している。
An object of the present invention is to solve such a problem.

[課題を解決するための手段] 本発明は、上記目的を達成するために、次のような構
成を採用している。
[Means for Solving the Problems] The present invention employs the following configuration to achieve the above object.

すなわち、本発明にかかる過給圧制御弁の制御方法
は、ウェイストゲートバルブを開閉するアクチュエータ
にコンプレッサ下流側の過給圧を導く導圧通路に設けら
れ、前記アクチュエータにかかる過給圧をデューティ制
御により調節するための過給圧制御弁の制御方法であっ
て、デューティ制御の際に前記過給圧制御弁に印加する
駆動電圧の周波数を、低エンジン回転域では高い周波数
に、高エンジン回転域では低い周波数に、不連続に切り
替えるようにしたことを特徴とする。
That is, the control method of the supercharging pressure control valve according to the present invention is provided in the pressure guiding passage for guiding the supercharging pressure on the compressor downstream side to the actuator that opens and closes the wastegate valve, and the supercharging pressure applied to the actuator is duty controlled. A method of controlling a supercharging pressure control valve for adjusting the supercharging pressure control valve according to claim 1, wherein the frequency of the drive voltage applied to the supercharging pressure control valve during duty control is set to a high frequency in a low engine rotation range and a high engine rotation range. Is characterized by discontinuously switching to a low frequency.

[作用] このような構成によれば、過給圧制御弁に印加する駆
動電圧の周波数は、過給圧制御弁のデューティ制御に通
常利用される周波数帯のものでよい。そして、過給圧制
御弁に印加する駆動電圧の周波数と吸気脈動の周波数と
が共振するエンジン回転域で、駆動電圧の周波数を、低
エンジン回転域では高い周波数に、高エンジン回転域で
は低い周波数に、不連続に切り替えれば、これらの共振
を有効に防止することができるとともに、共振によって
導圧通路に圧力変動が発生するのを有効に防ぐことが可
能となる。
[Operation] According to such a configuration, the frequency of the drive voltage applied to the boost pressure control valve may be in the frequency band normally used for duty control of the boost pressure control valve. Then, in the engine rotation range where the frequency of the drive voltage applied to the supercharging pressure control valve and the frequency of the intake pulsation resonate, the frequency of the drive voltage is set to a high frequency in the low engine rotation range and a low frequency in the high engine rotation range. In addition, if the switching is discontinuous, it is possible to effectively prevent these resonances, and it is possible to effectively prevent pressure fluctuations in the pressure guiding passages due to the resonances.

[実施例] 以下、本発明の一実施例を第1図〜第3図を参照して
説明する。
Embodiment An embodiment of the present invention will be described below with reference to FIGS.

第1図に概略的に示した排気タービン過給機は、排気
通路1に配置したタービン2と、吸気通路3に設けたコ
ンプレッサ4と、ウェイストゲートバルブ5を開閉する
アクチュエータ6とを備え、このアクチュエータ6の圧
力室(図示せず)とコンプレッサ下流側の吸気通路3と
を連通させる導圧通路7に、前記圧力室にかかる過給圧
のリーク量を調節する過給圧制御弁VSV8を設けたもので
ある。ウェイストゲートバルブ5は、タービン2を迂回
する排気バイパス通路9に設けてあり、前記アクチュエ
ータ6とリンク機構10を介して連結してある。アクチュ
エータ6は、その圧力室に前記導圧通路7からコンプレ
ッサ下流側の過給圧が作用するダイヤフラム弁で、圧力
室に作用する過給圧が設定値を上回ると、リンク機構10
を介してウェイトゲートバルブ5を開弁させるようにな
っている。過給圧制御弁VSV8は、電磁コイルを内蔵した
もので、第1のポート8aを前記導圧通路7に接続してあ
り、第2のポート8bをリリーフ通路11を介して図示しな
いエアクリーナ内に連通させてある。この過給圧制御弁
8は、電子制御装置12によりデューティ制御されるよう
になっており、電磁コイルに駆動電圧(パルス電圧)が
印加されると、第1のポート8aと第2のポート8bとが導
通し、非通電時には、両ポート8a、8b間が閉ざされるよ
うになっている。
The exhaust turbine supercharger schematically shown in FIG. 1 includes a turbine 2 arranged in an exhaust passage 1, a compressor 4 arranged in an intake passage 3, and an actuator 6 for opening and closing a wastegate valve 5. A boost pressure control valve VSV8 for adjusting a leakage amount of the boost pressure applied to the pressure chamber is provided in a pressure guide passage 7 that connects a pressure chamber (not shown) of the actuator 6 and the intake passage 3 on the downstream side of the compressor. It is a thing. The waste gate valve 5 is provided in the exhaust bypass passage 9 that bypasses the turbine 2, and is connected to the actuator 6 via a link mechanism 10. The actuator 6 is a diaphragm valve in which a boost pressure on the downstream side of the compressor acts on the pressure chamber from the pressure guiding passage 7. When the boost pressure acting on the pressure chamber exceeds a set value, the link mechanism 10 is operated.
The weight gate valve 5 is opened via the. The supercharging pressure control valve VSV8 has a built-in electromagnetic coil and has a first port 8a connected to the pressure guiding passage 7 and a second port 8b connected to a not shown air cleaner via a relief passage 11. It is in communication. The supercharging pressure control valve 8 is designed to be duty-controlled by an electronic control unit 12, and when a drive voltage (pulse voltage) is applied to the electromagnetic coil, the first port 8a and the second port 8b are controlled. The two ports 8a, 8b are closed when they are not energized.

電子制御装置12は、中央演算処理装置13と、メモリー
14と、入力インターフェース15と、出力インターフェー
ス16を備えたマイクロコンピュータユニットからなる。
入力インターフェース15には、少なくとも、圧力センサ
17からの吸気圧信号aと、クランク角センサ18からのエ
ンジン回転信号b等がそれぞれ入力され、出力インター
フェース16からは、前記過給圧制御弁VSV8にデューティ
制御信号cが出力されるようになっている。圧力センサ
17は、吸気圧に応じて信号を出力するように構成された
もので、図示しないサージタンクに設けてある。クラン
ク角センサ18は、エンジン回転に比例する信号を出力す
るように構成されたもので、ディストリビュータに設け
てある。しかして、この電子制御装置12は、前記圧力セ
ンサ17により検出された実際の過給圧と、それぞれのエ
ンジン回転域により設定した目標過給圧とが異なる場合
は、過給圧制御弁VSV8のデューティ比を変化させて、ア
クチュエータ6に作用する過給圧のリーク量を調節し、
運転状況に応じて吸入空気の過給圧を制御する役割を担
っている。
The electronic control unit 12 includes a central processing unit 13 and a memory.
It consists of a microcomputer unit equipped with 14, an input interface 15 and an output interface 16.
The input interface 15 has at least a pressure sensor
The intake pressure signal a from 17 and the engine rotation signal b from the crank angle sensor 18 are input respectively, and the output interface 16 outputs the duty control signal c to the supercharging pressure control valve VSV8. ing. Pressure sensor
Numeral 17 is configured to output a signal according to the intake pressure, and is provided in a surge tank (not shown). The crank angle sensor 18 is configured to output a signal proportional to the engine rotation, and is provided in the distributor. Then, this electronic control unit 12, when the actual supercharging pressure detected by the pressure sensor 17 and the target supercharging pressure set by each engine rotation range are different, the supercharging pressure control valve VSV8 The duty ratio is changed to adjust the leakage amount of the boost pressure acting on the actuator 6,
It plays the role of controlling the supercharging pressure of the intake air according to the operating conditions.

また、上記電子制御装置12には、第2図に概略的に示
すようなプログラムを設定してある。先ず、ステップ51
で、エンジン回転数が設定値3000rpm以下か否かを判別
し、設定値3000rpm以下であると判断した場合はステッ
プ52に進み、設定値3000rpmを上回っていると判断した
場合はステップ53に進む。ステップ52では、過給圧制御
弁VSV8に印加する駆動電圧の周波数を30Hzに切り替え
て、デューティ制御を行う。ステップ53では、過給圧制
御弁VSV8に印加する駆動電圧の周波数を20Hzに切り替え
て、デューティ制御を行う。
Further, the electronic control unit 12 is set with a program as schematically shown in FIG. First, step 51
Then, it is determined whether or not the engine speed is less than or equal to the set value 3000 rpm, and if it is determined that it is less than or equal to the set value 3000 rpm, the process proceeds to step 52, and if it is determined that it exceeds the set value 3000 rpm, the process proceeds to step 53. In step 52, the frequency of the drive voltage applied to the supercharging pressure control valve VSV8 is switched to 30 Hz to perform duty control. In step 53, the frequency of the drive voltage applied to the supercharging pressure control valve VSV8 is switched to 20 Hz to perform duty control.

このような構成によると、第3図に示すように、エン
ジン回転数NEが設定値3000rpm以下の場合は、過給圧制
御弁VSV8に印加される駆動電圧の周波数が30Hzに切り替
えられるため、かかるエンジン回転域で駆動電圧の周波
数と吸気脈動との共振が回避でき、アクチュエータ6の
圧力室にかかる過給圧の振れ(ブースト振れ量)を有効
に抑えることができる。一方、エンジン回転数が設定値
3000rpmを上回ると、過給圧制御弁VSV8に印加される駆
動電圧の周波数が20Hzに切り替えられるため、かかるエ
ンジン回転域で駆動電圧の周波数と吸気脈動とが共振す
るのを回避でき、アクチュエータ6の圧力室にかかる過
給圧の振れ(ブースト振れ量)を有効に抑制することが
できる。
With such a configuration, as shown in FIG. 3, when the engine speed NE is equal to or less than the set value 3000 rpm, the frequency of the drive voltage applied to the supercharging pressure control valve VSV8 is switched to 30 Hz. Resonance between the frequency of the drive voltage and the intake pulsation can be avoided in the engine rotation range, and the fluctuation of boost pressure (boost fluctuation amount) applied to the pressure chamber of the actuator 6 can be effectively suppressed. On the other hand, the engine speed is set
When it exceeds 3000 rpm, the frequency of the drive voltage applied to the supercharging pressure control valve VSV8 is switched to 20 Hz, so that the resonance of the drive voltage frequency and the intake pulsation can be avoided in such an engine rotation range, and the actuator 6 Fluctuation of boost pressure applied to the pressure chamber (boost shake amount) can be effectively suppressed.

したがって、以上のような構成によれば、ウェイスト
ゲートバルブ5を開閉するアクチュエータ6の圧力室
に、共振による圧力変動が作用するのを有効に防ぐこと
ができるので、エンジンの運転状況に応じて吸入空気の
過給圧を適切に調節することができる。しかも、過給圧
制御弁VSV8に印加される駆動電圧の周波数は、この実施
例の場合には、連続して変化させるのではなく、3000rp
mを境にして高い周波数たる30Hzと低い周波数たる20Hz
とに不連続に切り替えられるため、さらに、通常、利用
される周波数帯のものであるため、制御遅れを招いた
り、過給圧制御弁VSV8の耐久性を低下させるような不具
合を招くこともない。
Therefore, according to the above configuration, it is possible to effectively prevent the pressure fluctuation due to the resonance from acting on the pressure chamber of the actuator 6 that opens and closes the waste gate valve 5, so that the intake air is sucked depending on the operating condition of the engine. The supercharging pressure of air can be adjusted appropriately. Moreover, the frequency of the drive voltage applied to the supercharging pressure control valve VSV8 is not changed continuously in the case of this embodiment, but 3000 rpm
High frequency 30Hz and low frequency 20Hz with m as the boundary
In addition, since it is discontinuously switched to and, since it is in the frequency band that is normally used, it does not cause a control delay or a problem that deteriorates the durability of the supercharging pressure control valve VSV8. .

なお、上記実施例は、吸気脈動等との共振点が異なる
2種類の周波数を好適に使い分けるようにした場合であ
るが、過給圧制御弁に印加する駆動電圧の周波数は、3
種類以上でもよい。
In the above embodiment, two types of frequencies having different resonance points with intake pulsation are used properly, but the frequency of the drive voltage applied to the supercharging pressure control valve is 3
It may be more than one kind.

[発明の効果] 以上のような構成からなる本発明によれば、過給圧制
御弁に印加する駆動電圧の周波数を、低エンジン回転域
では高い周波数に、高エンジン回転域では低い周波数
に、不連続に切り替えるようにしているので、その切り
替え途中に発生する可能性がある共振を防止することが
でき、過給圧制御弁の機能や耐久性等を確保しつつ、ウ
ェイストゲートバルブを開閉するアクチュエータに共振
による圧力変動が作用するのを有効に抑制することがで
き、エンジンの運転状況に応じて適切に吸入空気の過給
圧を調節することができる制御性に優れた過給圧制御弁
の制御方法を提供できる。
[Advantages of the Invention] According to the present invention configured as described above, the frequency of the drive voltage applied to the supercharging pressure control valve is set to a high frequency in the low engine rotation range and a low frequency in the high engine rotation range. Since the switching is performed discontinuously, resonance that may occur during the switching can be prevented, and the waste gate valve is opened and closed while ensuring the function and durability of the boost pressure control valve. A supercharging pressure control valve with excellent controllability that can effectively suppress pressure fluctuations due to resonance on the actuator and can appropriately adjust the supercharging pressure of intake air according to the operating conditions of the engine. Can be provided.

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

第1図から第3図は本発明の一実施例を示し、第1図は
概略的な全体構成図、第2図は制御手順を概略的に示す
フローチャート図、第3図は制御設定条件および効果を
示す図である。第4図と第5図はそれぞれ従来例を示す
第3図相当の図である。 2……タービン 3……吸気通路 4……コンプレッサ 5……ウェイストゲートバルブ 6……アクチュエータ 7……導圧通路 8……過給圧制御弁
1 to 3 show an embodiment of the present invention, FIG. 1 is a schematic overall configuration diagram, FIG. 2 is a flowchart diagram schematically showing a control procedure, and FIG. 3 is a control setting condition and It is a figure which shows an effect. 4 and 5 are views corresponding to FIG. 3 showing a conventional example. 2 ... Turbine 3 ... Intake passage 4 ... Compressor 5 ... Wastegate valve 6 ... Actuator 7 ... Pressure guiding passage 8 ... Supercharging pressure control valve

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】ウェイストゲートバルブを開閉するアクチ
ュエータにコンプレッサ下流側の過給圧を導く導圧通路
に設けられ、前記アクチュエータにかかる過給圧をデュ
ーティ制御により調節するための過給圧制御弁の制御方
法であって、デューティ制御の際に前記過給圧制御弁に
印加する駆動電圧の周波数を、低エンジン回転域では高
い周波数に、高エンジン回転域では低い周波数に、不連
続に切り替えるようにしたことを特徴とする過給圧制御
弁の制御方法。
1. A supercharging pressure control valve for adjusting a supercharging pressure applied to the actuator by duty control, which is provided in a pressure guiding passage for guiding the supercharging pressure downstream of a compressor to an actuator for opening and closing a wastegate valve. A control method, wherein the frequency of the drive voltage applied to the supercharging pressure control valve at the time of duty control is discontinuously switched to a high frequency in a low engine rotation range and a low frequency in a high engine rotation range. A method for controlling a supercharging pressure control valve, characterized in that
JP1272416A 1989-10-19 1989-10-19 Control method of boost pressure control valve Expired - Fee Related JP2674842B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1272416A JP2674842B2 (en) 1989-10-19 1989-10-19 Control method of boost pressure control valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1272416A JP2674842B2 (en) 1989-10-19 1989-10-19 Control method of boost pressure control valve

Publications (2)

Publication Number Publication Date
JPH03134228A JPH03134228A (en) 1991-06-07
JP2674842B2 true JP2674842B2 (en) 1997-11-12

Family

ID=17513605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1272416A Expired - Fee Related JP2674842B2 (en) 1989-10-19 1989-10-19 Control method of boost pressure control valve

Country Status (1)

Country Link
JP (1) JP2674842B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007674A (en) * 2009-10-15 2010-01-14 Denso Corp Wastegate valve control device of internal combustion engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169645A (en) * 1984-02-14 1985-09-03 Nippon Denso Co Ltd Control method of control valve for controlling idle speed
JPS61160237U (en) * 1985-03-28 1986-10-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007674A (en) * 2009-10-15 2010-01-14 Denso Corp Wastegate valve control device of internal combustion engine

Also Published As

Publication number Publication date
JPH03134228A (en) 1991-06-07

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