JPH0213131B2 - - Google Patents
Info
- Publication number
- JPH0213131B2 JPH0213131B2 JP58202949A JP20294983A JPH0213131B2 JP H0213131 B2 JPH0213131 B2 JP H0213131B2 JP 58202949 A JP58202949 A JP 58202949A JP 20294983 A JP20294983 A JP 20294983A JP H0213131 B2 JPH0213131 B2 JP H0213131B2
- Authority
- JP
- Japan
- Prior art keywords
- intake air
- cooled
- evaporator
- air temperature
- cooler
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0437—Liquid cooled heat exchangers
- F02B29/0443—Layout of the coolant or refrigerant circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0412—Multiple heat exchangers arranged in parallel or in series
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、過給機下流の吸気通路に空冷式もし
くは水冷式の冷却器を配設した過給機付エンジン
の吸気冷却装置の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in an intake air cooling device for a supercharged engine in which an air-cooled or water-cooled cooler is disposed in the intake passage downstream of a supercharger. It is something.
（従来の技術）
従来、過給機付エンジンにおいては、過給機に
て吸入空気が圧縮されてエンジンの燃焼室に送給
されるが、その場合、吸入空気が圧縮により昇温
し空気密度が小さくなり、充填効率が低下するこ
とから、過給機下流の吸気通路に空冷式もしくは
水冷式の冷却器を設け、過給機を冷却することが
行われている。(Prior art) Conventionally, in a supercharged engine, the intake air is compressed by the supercharger and sent to the combustion chamber of the engine, but in this case, the temperature of the intake air increases due to compression, and the air density As a result, the charging efficiency decreases, so an air-cooled or water-cooled cooler is provided in the intake passage downstream of the supercharger to cool the supercharger.
ところが、そのような空冷式もしくは水冷式の
冷却器では、冷媒としての空気もしくは水の温度
よりも過給気の温度を低くすることができないの
で、十分に冷却することができなかつた。 However, with such air-cooled or water-cooled coolers, the temperature of the supercharged air cannot be made lower than the temperature of the air or water used as the refrigerant, and therefore, sufficient cooling cannot be achieved.
そこで、さらに冷却できるように、冷却装置を
前記冷却器の代わりに用いることが提案されてい
る（例えば、実開昭55−142631号公報参照）。 Therefore, it has been proposed to use a cooling device in place of the cooler in order to achieve further cooling (see, for example, Japanese Utility Model Application Publication No. 142631/1983).
（考案が解決しようとする課題）
しかしながら、そのようにしても、十分な冷却
性を確保する容量を確保するためには、前記冷凍
装置を構成するエバポレータ（蒸発器）およびコ
ンデンサ（凝縮器）が大型化するという不具合が
ある。(Problem to be solved by the invention) However, even with this method, in order to ensure sufficient cooling capacity, the evaporator and condenser that constitute the refrigeration system must be There is a problem with increasing the size.
本発明はかかる点に鑑みてなされたもので、空
冷式もしくは水冷式の冷却器および冷凍装置を併
用することにより、冷凍装置のエバポレータおよ
びコンデンサを大型化することなく、過給気を効
果的に冷却することができる過給機付エンジンの
吸気冷却装置を提供することを目的とするもので
ある。 The present invention has been made in view of this point, and by using an air-cooled or water-cooled cooler and a refrigeration system, supercharging air can be effectively used without increasing the size of the evaporator and condenser of the refrigeration system. The object of the present invention is to provide an intake air cooling device for a supercharged engine that can be cooled.
（課題を解決するための手段）
本発明は、過給機下流の吸気通路に空冷式もし
くは水冷式の冷却器を配設した過給機付エンジン
に係るもので、上述した目的を達成するために、
上記空冷式もしくは水冷式の冷却器の下流側の吸
気通路に冷凍装置のエバポレータが設定され、該
エバポレータと上記冷却器との間に第１吸気温度
検出器が、上記エバポレータの下流に第２吸気温
度検出器がそれぞれ配設され、さらに、上記第１
吸気温度検出器の出力を受け上記エバポレータと
冷却器との間の吸気温度が設定温度以上の高温時
に上記冷凍装置を作動させる第１制御手段と、上
記第２吸気温度検出器の出力を受け上記エバポレ
ータ下流の吸気温度が高いほど上記冷凍装置の膨
張弁の開口面積を大きく作動させる第２制御手段
とが設けられている。(Means for Solving the Problems) The present invention relates to a supercharged engine in which an air-cooled or water-cooled cooler is disposed in an intake passage downstream of a supercharger, and in order to achieve the above-mentioned objects. To,
An evaporator of the refrigeration system is set in an intake passage downstream of the air-cooled or water-cooled cooler, a first intake temperature detector is installed between the evaporator and the cooler, and a second intake air temperature detector is installed downstream of the evaporator. Temperature detectors are respectively disposed, and the first
a first control means that receives an output from the intake air temperature detector and operates the refrigeration system when the intake air temperature between the evaporator and the cooler is higher than a set temperature; A second control means is provided that operates the opening area of the expansion valve of the refrigeration system to a larger extent as the intake air temperature downstream of the evaporator is higher.
（作用）
過給機にて圧縮された過給気は、まず、空冷式
もしくは水冷式の冷却器にて冷却される。この冷
却器にて冷却された後の過給気は、第１制御手段
がエバポレータと冷却器との間の吸気温度が設定
温度以上の高温時に冷凍装置を作動させるので、
冷凍装置のエバポレータ内の冷媒との間で熱交換
を行い、冷媒を蒸発させて過給気がさらに冷却さ
れる。なお、エバポレータと冷却器との間の吸気
温度が設定温度未満の低温時には、必要以上の冷
却を抑制するために、冷凍装置は作動しない。(Function) The supercharged air compressed by the supercharger is first cooled by an air-cooled or water-cooled cooler. The first control means operates the refrigeration system for the supercharged air after being cooled by the cooler when the intake air temperature between the evaporator and the cooler is higher than the set temperature.
The supercharged air is further cooled by exchanging heat with the refrigerant in the evaporator of the refrigeration system and evaporating the refrigerant. Note that when the intake air temperature between the evaporator and the cooler is lower than the set temperature, the refrigeration system does not operate in order to suppress excessive cooling.
また、第２制御手段が、冷凍装置の膨張弁の開
口面積をエバポレータ下流の吸気温度が高いほど
大きく作動させ、冷凍装置による冷却能力を変化
させる。 Further, the second control means increases the opening area of the expansion valve of the refrigeration system as the intake air temperature downstream of the evaporator increases, thereby changing the cooling capacity of the refrigeration system.
（実施例）
以下、本発明の実施例を図面に沿つて詳細に説
明する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
エンジン１のシリンダブロツク２、シリンダヘ
ツド３およびピストン４にて構成される燃焼室５
に吸気弁６にて開閉される吸気ポート７を介して
通ずる吸気通路８には、上流側から、エアクリー
ナ９、ターボ過給機１０のコンプレツサ１１、空
冷式冷却器（インタークーラ）１２、拡大室とし
てのサージタンク１３、燃料噴射弁１４およびス
ロツトルバルブ１５が順に配設されている。 Combustion chamber 5 consisting of cylinder block 2, cylinder head 3 and piston 4 of engine 1
An intake passage 8 that communicates with the intake port 7 that is opened and closed by the intake valve 6 includes, from the upstream side, an air cleaner 9, a compressor 11 of a turbocharger 10, an air-cooled cooler (intercooler) 12, and an expansion chamber. A surge tank 13, a fuel injection valve 14, and a throttle valve 15 are arranged in this order.
前記サージタンク１３には、蒸気圧縮式冷凍サ
イクルの冷凍装置１６における熱交換器としての
エバポレータ１７が配設され、前記冷却器１２に
て冷却された過給気をさらに低い温度に冷却する
ようになつている。 The surge tank 13 is provided with an evaporator 17 as a heat exchanger in the refrigeration device 16 of the vapor compression refrigeration cycle, and is configured to cool the supercharged air cooled by the cooler 12 to a lower temperature. It's summery.
前記冷凍装置１６において冷媒（フレオン）が
流れる冷媒通路１８には、冷媒の流れ方向におい
て、前記エバポレータ１７、コンプレツサ（圧縮
機）１９、コンデンサ２０、リキツドタンク２
１、および開口面積が変化する膨張弁２２が順に
配設されている。コンプレツサ１９は、電磁クラ
ツチ２３を介して、エンジン１にて駆動されるプ
ーリ２４と連結されるようになつている。また、
前記冷却器１２とサージタンク１３内のエバポレ
ータ１７との間の吸気通路８には第１吸気温度セ
ンサ２５が、サージタンク１３内のエバポレータ
１７の下流であつて燃料噴射弁１４の上流の吸気
通路８には第２吸気温度センサ２６がそれぞれ配
設されている。 In the refrigerant passage 18 through which the refrigerant (Freon) flows, there are the evaporator 17, compressor 19, condenser 20, and liquid tank 2 in the refrigerant flow direction.
1 and an expansion valve 22 whose opening area changes are arranged in this order. The compressor 19 is connected to a pulley 24 driven by the engine 1 via an electromagnetic clutch 23. Also,
A first intake air temperature sensor 25 is installed in the intake passage 8 between the cooler 12 and the evaporator 17 in the surge tank 13; A second intake air temperature sensor 26 is disposed at each of the intake air temperature sensors 8 .
２７は冷凍装置１６の作動を制御するコントロ
ールユニツトで、電磁クラツチ２３、膨張弁２
２、第１及び第２温度センサ２５，２６に電気的
に連係され、しかして第１吸気温度センサ２５が
冷却器１２とエバポレータ１７との間の吸気温度
を検出し、該吸気温度が設定温度以上になつたと
きに電磁クラツチ２３を接続してコンプレツサ１
９（冷却装置）を駆動させる第１制御手段ととも
に、第２吸気温度センサ２６にて検出されるエバ
ポレータ１７下流の吸気温度が高くなるにつれて
膨張弁２２の開口量が大きくなるように制御動作
をする第２制御手段とを有する。 27 is a control unit that controls the operation of the refrigeration system 16, and includes an electromagnetic clutch 23 and an expansion valve 2.
2. The first intake air temperature sensor 25 is electrically connected to the first and second temperature sensors 25 and 26, and the first intake air temperature sensor 25 detects the intake air temperature between the cooler 12 and the evaporator 17. When the temperature exceeds the limit, connect the electromagnetic clutch 23 and compressor 1.
9 (cooling device), and performs a control operation such that the opening amount of the expansion valve 22 increases as the intake air temperature downstream of the evaporator 17 detected by the second intake air temperature sensor 26 increases. and a second control means.
また、エンジン１の燃焼室５に排気弁２８にて
開閉される排気ポート２９を介して通ずる排気通
路３０にはターボ過給機１０のタービン３１が配
設され、該タービン３１の上流側と下流側とを接
続するバイパス通路３２が設けられている。この
バイパス通路３２の途中には、ウエストゲートバ
ルブ３４が介設されている。このウエストゲート
バルブ３４には、ケーシング３４ａがダイヤフラ
ム３４ｂにて２分され、第１室３４ｃにスプリン
グ３１ｄが縮装される一方、第２室３４ｅがサー
ジタンク１３の圧力吐出口３５に連通され、それ
で、サージング１３内の圧力が一定値以上になる
と、ダイヤフラム３４ｂがスプリング３４ｄの弾
発力に抗して偏位し、該ダイヤフラム３４ｂに連
結した弁体３４ｉが変位してバイパス通路３２を
開き、排気ガスの一部をリリーフさせ、過給圧を
下げるようになつている。 Further, a turbine 31 of the turbocharger 10 is disposed in an exhaust passage 30 that communicates with the combustion chamber 5 of the engine 1 via an exhaust port 29 that is opened and closed by an exhaust valve 28. A bypass passage 32 is provided to connect the two sides. A waste gate valve 34 is interposed in the middle of this bypass passage 32. In this waste gate valve 34, a casing 34a is divided into two by a diaphragm 34b, a spring 31d is compressed in a first chamber 34c, and a second chamber 34e is communicated with a pressure discharge port 35 of the surge tank 13. Therefore, when the pressure inside the surging 13 exceeds a certain value, the diaphragm 34b is deflected against the elastic force of the spring 34d, and the valve body 34i connected to the diaphragm 34b is displaced to open the bypass passage 32. It is designed to relieve some of the exhaust gas and lower the boost pressure.
上記のように構成すれば、エアクリーナ９を介
して吸入され、ターボ過給機１０のコンプレツサ
１１にて圧縮された過給気は、まず、冷却器１２
にて冷却される。この冷却器１２にて冷却された
後の過給気の温度が第１吸気温度センサ２５にて
検出され、その吸気温度が設定温度（例えば70
℃）以上であれば、電磁クラツチ２３を接続して
コンプレツサ１９を駆動し、冷凍装置１６を作動
させる。 With the above configuration, the supercharged air sucked in via the air cleaner 9 and compressed by the compressor 11 of the turbocharger 10 is first transferred to the cooler 12.
It is cooled down. The temperature of the supercharged air after being cooled by the cooler 12 is detected by the first intake air temperature sensor 25, and the intake air temperature is set to a set temperature (for example, 70°C).
C), the electromagnetic clutch 23 is connected, the compressor 19 is driven, and the refrigeration system 16 is operated.
それより、冷却器１２にて予冷却された過給気
が、サージタンク１３において、冷凍装置１６の
エバポレータ１７内の冷媒との間で熱交換を行
い、冷媒を蒸発させて過給気がさらに冷却され
る。 The supercharged air pre-cooled by the cooler 12 exchanges heat with the refrigerant in the evaporator 17 of the refrigeration system 16 in the surge tank 13, evaporates the refrigerant, and the supercharged air further increases. cooled down.
その場合、サージタンク１３内で冷却された後
の過給気の温度を第２吸気温度センサ２６で検出
し、その吸気温度に応じて膨張弁２２の開口量が
変化するようにフイードバツク制御するので、吸
気温度が高い場合は冷却能力を高めるために冷媒
の流量が多くなり、低い場合は逆に少なくなり、
必要以上の効率の悪い冷却を抑制し、結果として
過給気の温度は略一定（例えば40℃）に保たれ
る。 In that case, the temperature of the supercharged air after being cooled in the surge tank 13 is detected by the second intake air temperature sensor 26, and feedback control is performed so that the opening amount of the expansion valve 22 changes according to the intake air temperature. , When the intake air temperature is high, the flow rate of refrigerant increases to increase the cooling capacity, and when it is low, the flow rate of refrigerant decreases.
Unnecessary and inefficient cooling is suppressed, and as a result, the temperature of the supercharged air is kept approximately constant (for example, 40°C).
一方、第１吸気温度センサ２５にて設定温度以
下であることが検出された場合には、さらに冷却
する必要はないので、電磁クラツチ２３を接続し
てコンプレツサ１９を駆動する必要がなく、冷凍
装置１６を動させず、エンジン負荷の増大が抑制
される。 On the other hand, if the first intake air temperature sensor 25 detects that the temperature is below the set temperature, there is no need for further cooling, so there is no need to connect the electromagnetic clutch 23 to drive the compressor 19, and the refrigeration system 16 is not moved, and an increase in engine load is suppressed.
なお、上記実施例では、空冷式の冷却器１２を
用いいているが、水冷式の冷却器を用いても差支
えないし、また、コントロールユニツト２７とし
てデジタルコンピユータを用いることもできる。 Although the above embodiment uses an air-cooled cooler 12, a water-cooled cooler may also be used, and a digital computer may also be used as the control unit 27.
（発明の効果）
本発明は、上記のように、空冷式もしくは水冷
式の冷却器下流の吸気通路に冷凍装置のエバポレ
ータを設けたため、冷凍装置のエバポレータおよ
びコンデンサを大型化することなく、冷却器と冷
凍装置との冷却能力が相俟つて過給気を効果的に
冷却することができ、それによつて吸気の充填効
率を高めることが可能となる。特に、エバポレー
タと冷却器との間の吸気温度が設定温度以上の高
温時に冷凍装置を作動させる第１制御手段と、エ
バポレータ下流の吸気温度が高いほど冷凍装置の
膨張弁の開口面積を大きく作動させる第２制御手
段とを設けているので、必要以上の効率の悪い冷
却が抑制されるとともにエンジン負荷の増大が抑
制されて、吸気温度が下げられ、吸気の充填効率
が高められる。(Effects of the Invention) As described above, the present invention provides the evaporator of the refrigeration system in the intake passage downstream of the air-cooled or water-cooled cooler. The cooling capacity of the supercharged air and the refrigeration system work together to effectively cool the supercharged air, thereby making it possible to increase the filling efficiency of the intake air. In particular, the first control means operates the refrigeration system when the intake air temperature between the evaporator and the cooler is higher than a set temperature, and the first control means operates the refrigeration system to increase the opening area of the expansion valve as the intake air temperature downstream of the evaporator increases. Since the second control means is provided, unnecessarily inefficient cooling is suppressed, an increase in engine load is suppressed, the intake air temperature is lowered, and the intake air filling efficiency is increased.
図面は本発明の一実施例である過給機付エンジ
ンの吸気冷却装置の全体構成図である。
１……エンジン、８……吸気通路、１０……タ
ーボ過給機、１２……空冷式冷却器、１６……冷
凍装置、１７……エバポレータ、２５……第１吸
気温度センサ、２６……第２吸気温度センサ、２
７……コントロールユニツト。
The drawing is an overall configuration diagram of an intake air cooling device for a supercharged engine, which is an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Engine, 8... Intake passage, 10... Turbo supercharger, 12... Air-cooled cooler, 16... Refrigeration device, 17... Evaporator, 25... First intake air temperature sensor, 26... Second intake air temperature sensor, 2
7...Control unit.
Claims (1)
式の冷却器を配設した過給機付エンジンにおい
て、上記空冷式もしくは水冷式の冷却器の下流側
の吸気通路に冷凍装置のエバポレータが配設さ
れ、該エバポレータと上記冷却器との間に第１吸
気温度検出器が、上記エバポレータの下流に第２
吸気温度検出器がそれぞれ配設され、さらに、上
記第１吸気温度検出器の出力を受け上記エバポレ
ータと冷却器との間の吸気温度が設定温度以上の
高温時に上記冷凍装置を作動させる第１制御手段
と、上記第２吸気温度検出器の出力を受け上記エ
バポレータ下流の吸気温度が高いほど上記冷凍装
置の膨張弁の開口面積を大きく作動させる第２制
御手段とが設けられていることを特徴とする過給
機付エンジンの吸気冷却装置。1 In a supercharged engine in which an air-cooled or water-cooled cooler is installed in the intake passage downstream of the turbocharger, the evaporator of the refrigeration system is installed in the intake passage downstream of the air-cooled or water-cooled cooler. A first intake air temperature detector is provided between the evaporator and the cooler, and a second intake air temperature detector is provided downstream of the evaporator.
Intake air temperature detectors are respectively disposed, and further includes a first control for operating the refrigeration system when the intake air temperature between the evaporator and the cooler is higher than a set temperature in response to the output of the first intake air temperature detector. and a second control means that receives the output of the second intake air temperature detector and operates the opening area of the expansion valve of the refrigeration system to a larger extent as the intake air temperature downstream of the evaporator increases. Intake air cooling system for supercharged engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58202949A JPS6093118A (en) | 1983-10-28 | 1983-10-28 | Intake air cooling device of engine with supercharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58202949A JPS6093118A (en) | 1983-10-28 | 1983-10-28 | Intake air cooling device of engine with supercharger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6093118A JPS6093118A (en) | 1985-05-24 |
| JPH0213131B2 true JPH0213131B2 (en) | 1990-04-03 |
Family
ID=16465827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58202949A Granted JPS6093118A (en) | 1983-10-28 | 1983-10-28 | Intake air cooling device of engine with supercharger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6093118A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6346627U (en) * | 1986-09-11 | 1988-03-29 | ||
| FR2614406B1 (en) * | 1987-04-27 | 1989-12-08 | Valeo | TWO-STAGE HEAT EXCHANGER AND MOUNTING METHOD THEREOF |
| FR2757903B1 (en) * | 1996-12-31 | 1999-03-26 | New Sulzer Diesel France Sa | METHOD AND APPARATUS FOR RECOVERING HEAT IN COMBUSTION AIR OF AN ENGINE |
| US6006540A (en) * | 1998-08-03 | 1999-12-28 | Ford Global Technologies, Inc. | Charge air management system for automotive engine |
| DE19962391A1 (en) * | 1999-12-23 | 2001-06-28 | Behr Industrietech Gmbh & Co | Intercooler |
| US6748934B2 (en) * | 2001-11-15 | 2004-06-15 | Ford Global Technologies, Llc | Engine charge air conditioning system with multiple intercoolers |
| DE10254016A1 (en) * | 2002-11-19 | 2004-06-03 | Behr Gmbh & Co. Kg | Device for cooling charging air for turbocharger with first cooling stage has second cooling stage(s), cooling device with coolant circuit with evaporator and/or refrigerant circuit |
| US7669417B2 (en) * | 2006-01-30 | 2010-03-02 | Titan Research And Innovations Pty Ltd | Engine after-cooling system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5252020A (en) * | 1975-10-23 | 1977-04-26 | Kubota Ltd | Internal engine combustin air cooler |
-
1983
- 1983-10-28 JP JP58202949A patent/JPS6093118A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6093118A (en) | 1985-05-24 |
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