JPH01147113A - Rotational speed controller of hydraulic driving cooling fan for internal combustion engine - Google Patents
Rotational speed controller of hydraulic driving cooling fan for internal combustion engineInfo
- Publication number
- JPH01147113A JPH01147113A JP30670087A JP30670087A JPH01147113A JP H01147113 A JPH01147113 A JP H01147113A JP 30670087 A JP30670087 A JP 30670087A JP 30670087 A JP30670087 A JP 30670087A JP H01147113 A JPH01147113 A JP H01147113A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- working fluid
- opening amount
- engine
- hydraulic motor
- 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
- 238000001816 cooling Methods 0.000 title claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 38
- 239000000498 cooling water Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000007423 decrease Effects 0.000 claims description 5
- 230000008094 contradictory effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Landscapes
- Control Of Positive-Displacement Air Blowers (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、自動車等の車輌に用いられる内燃機関の冷却
ファンの回転速度制御装置に係り、特に液圧駆動式の冷
却ファンの回転速度装置に係る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotation speed control device for a cooling fan of an internal combustion engine used in vehicles such as automobiles, and more particularly to a rotation speed control device for a hydraulically driven cooling fan. .
従来の技術
自動車等の車輌に用いられる内燃機関に於て、機関冷却
用ラジェータへ冷却風を供給する冷却ファンを油圧モー
タの如き液圧モータによって駆動し、その回転速度を冷
却水温度等に応じて制御することが既に知られており、
これは例えば実公昭４９−４０１８３号、特開昭５８−
１３１１９号、特開昭６２−１３９９１８号の各公報に
示されている。Conventional Technology In internal combustion engines used in vehicles such as automobiles, a cooling fan that supplies cooling air to an engine cooling radiator is driven by a hydraulic motor such as a hydraulic motor, and its rotational speed is adjusted depending on the temperature of the cooling water, etc. It is already known that the
This is, for example, Utility Model Publication No. 49-40183, JP-A-58-
No. 13119 and Japanese Unexamined Patent Publication No. 62-139918.
また液圧モータの作動液体の温度が低く、該作動液体の
粘性が高い時にはこれを液圧モータへ圧送するポンプに
よる出力損失の低減のために前記作動液体のリリーフ量
を増大することが既に提案されており、これは例えば特
開昭６２−１４２８１９号公報に示されている。Furthermore, when the temperature of the working fluid of the hydraulic motor is low and the viscosity of the working fluid is high, it has already been proposed to increase the relief amount of the working fluid in order to reduce the output loss caused by the pump that pumps the working fluid to the hydraulic motor. This is shown, for example, in Japanese Patent Laid-Open No. 142819/1983.
発明が解決しようとする問題点
液圧駆動式の冷却ファンに於ては、内燃機関の始動時に
はその作動液体が低温でなくても、また作動液体が高粘
性状態でなくても液圧が急上昇し、この時にはポンプの
摺接運動部等に充分な液膜が形成される以前であること
から、この時の液圧上昇はポンプの耐久性を低下させる
大きい原因となる。Problems to be Solved by the Invention In a hydraulically driven cooling fan, when an internal combustion engine is started, the hydraulic pressure rises rapidly even when the working fluid is not at a low temperature or in a high viscosity state. However, since at this time a sufficient liquid film has not yet been formed on the sliding parts of the pump, the increase in liquid pressure at this time is a major cause of reducing the durability of the pump.
本発明は、機関始動時にはいずれに於ても作動液体の液
圧が上昇することを回避し、ポンプの耐久性の向上を図
った改良された液圧駆動式冷却ファンの回転速度制御装
置を提供することを目的としている。The present invention provides an improved rotational speed control device for a hydraulically driven cooling fan that prevents the hydraulic pressure of the working fluid from increasing at any time when the engine is started and improves the durability of the pump. It is intended to.
問題点を解決するための手段
上述の如き目的は、本発明によれば、ポンプより液圧モ
ータに供給される作動液体の流量に応じて回転速度を制
御される冷却ファンの回転速度制御装置に於て、前記ポ
ンプより前記液圧モータへ供給される作動液体の流量と
リリーフ流量とを互いに相反す°る関係にて増減制御す
る流量制御弁と、機関冷却用の冷却水の温度を検出する
冷却水温度検出手段と、冷却水温度の上昇に応じて前記
ポンプより前記液圧モータへ供給される作動液体の流量
を増大すべく前記流量制御弁の開弁量を決定する冷却水
温度対応開弁量決定手段と、内燃機関が始動されてから
所定時間が経過したことを判別する機関始動後経過時間
判別手段と、前記機関始動後経過時間判別手段により内
燃機関が始動されてから所定時間が経過したと判別され
るまでは前記ポンプより前記液圧モータへ供給される作
動液体の流量が最小値になるように前記流量制御弁へ開
弁量制御信号を出力し且前記機関始動後経過時間判別手
段により内燃機関が始動されてから所定時間が経過した
と判定された時には前記冷却水温度対応開弁量決定手段
により決定された開弁量をもって前記流量制御弁が開弁
すべく開弁量制御信号を前記流量制御弁へ出力する開弁
量制御信号出力手段とを有する内燃機関の液圧駆動式冷
却ファンの回転速度制御装置によって達成される。、発
明の作用及び効果
上述の如き構成によれば、作動液体が低温でなくても、
また高粘性状態でなくても内燃機関の始動時には必ず作
動液体のリリーフ量が最大になり、これにより機関始動
時に液圧が不必要に上昇することが回避され、同時にポ
ンプの耐久性が向上するようになる。Means for Solving the Problems According to the present invention, the above-mentioned object is to provide a rotational speed control device for a cooling fan whose rotational speed is controlled according to the flow rate of working fluid supplied from a pump to a hydraulic motor. A flow control valve that controls the flow rate of the working fluid supplied from the pump to the hydraulic motor and the relief flow rate to increase or decrease in a mutually contradictory relationship, and detects the temperature of cooling water for engine cooling. cooling water temperature detecting means; and a cooling water temperature corresponding opening for determining the opening amount of the flow rate control valve in order to increase the flow rate of the working fluid supplied from the pump to the hydraulic motor in response to a rise in the temperature of the cooling water. a valve amount determining means; an elapsed time since engine start determining means for determining that a predetermined time has elapsed since the internal combustion engine was started; Until it is determined that the elapsed time has elapsed, a valve opening amount control signal is output to the flow rate control valve so that the flow rate of the working fluid supplied from the pump to the hydraulic motor becomes a minimum value, and the time elapsed after the engine start is determined to be the same. When the determining means determines that a predetermined period of time has elapsed since the internal combustion engine was started, the flow rate control valve opens to the valve opening amount determined by the cooling water temperature corresponding valve opening amount determining means. This is achieved by a rotational speed control device for a hydraulically driven cooling fan of an internal combustion engine, which has a valve opening amount control signal output means for outputting an amount control signal to the flow rate control valve. According to the above-described configuration, even if the working fluid is not at a low temperature,
Furthermore, even when the internal combustion engine is not in a high viscosity state, the relief amount of the working fluid is always at its maximum when starting the internal combustion engine, which prevents an unnecessary increase in fluid pressure when starting the engine, and at the same time improves the durability of the pump. It becomes like this.
実施例
以下に添付の図を参照して本発明を実施例について詳細
に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail by way of embodiments with reference to the accompanying drawings.
第１図は本発明による冷却ファンの回転速度制御装置を
備えだ液圧駆動式冷却ファン装置の一つの実施例を示し
ている。図に於て、１０は機関冷却用ラジェータ１２へ
冷却風を供給する冷却ファンを示しており、冷却ファン
１０は液圧モータ１６により回転駆動されるようになっ
ている。FIG. 1 shows one embodiment of a hydraulically driven cooling fan device equipped with a cooling fan rotation speed control device according to the present invention. In the figure, reference numeral 10 indicates a cooling fan that supplies cooling air to an engine cooling radiator 12, and the cooling fan 10 is rotationally driven by a hydraulic motor 16.
液圧モータ１６は、これに供給される油の如き作動液体
の流量の増大に応じて回転速度を増大するよう構成され
ており、作動液体人口１８を導管２０によって流量制御
弁２２に接続され、また作動液体出口°２４を導管２６
によって作動液体のリザーブタンク２８に接続されてい
る。The hydraulic motor 16 is configured to increase its rotational speed in response to an increase in the flow rate of a working fluid, such as oil, supplied thereto, and has a working fluid supply 18 connected to a flow control valve 22 by a conduit 20; In addition, the working liquid outlet °24 is connected to the conduit 26.
It is connected to a reserve tank 28 for working fluid.
流量制御弁２２はポンプ３０と連設されている。The flow control valve 22 is connected to the pump 30.
ポンプ３０は、ベルト式伝動装置３４によって内燃機関
３６の出力軸３８と駆動連結され、内燃機関３６によっ
て直動式に回転駆動されるようになっている。ポンプ３
０は、リザーブタンク２８の作動液体を導管３２を経て
吸上げ、これを流量制御弁２２へ圧送するようになって
いる。The pump 30 is drivingly connected to an output shaft 38 of an internal combustion engine 36 by a belt type transmission 34, and is rotatably driven by the internal combustion engine 36 in a direct-acting manner. pump 3
0 sucks up the working fluid from the reserve tank 28 through the conduit 32 and forces it to the flow rate control valve 22.
流量制御弁２２は、電磁作動式の流量制御弁であり、電
磁作動部に与えられるパルス信号のデユーティ比に応じ
て液圧モータ１６へ供給する作動液体の流量とリリーフ
弁２３へ作動液体を戻す流量とを互いに相反する関係に
て増減制御するようになっている。この実施例に於ては
、流量制御弁２２はこれの電磁作動部に与えられるパル
ス信号のデユーティ比の増大に応じて液圧モータ１６に
供給する作動液体の流量を増大すると共にリリーフ通路
２３への作動液体の流量を減少するようになっている。The flow rate control valve 22 is an electromagnetically actuated flow control valve, and controls the flow rate of the working liquid supplied to the hydraulic motor 16 and the working liquid returned to the relief valve 23 according to the duty ratio of the pulse signal given to the electromagnetic actuating part. The flow rate is controlled to increase or decrease in a mutually contradictory relationship. In this embodiment, the flow rate control valve 22 increases the flow rate of the working fluid supplied to the hydraulic motor 16 in response to an increase in the duty ratio of the pulse signal applied to the electromagnetic actuating portion thereof, and also increases the flow rate of the working fluid to the relief passage 23. The flow rate of the working fluid is reduced.
従って、この実施例に於ては、流量制御弁２２の電磁作
動部に与えられるパルス信号のデユーティ比の増大に応
じてファン回転数が増大し、前記デユーティ比の減少に
応じてファン回転数が低下するようになる。Therefore, in this embodiment, the fan rotation speed increases as the duty ratio of the pulse signal applied to the electromagnetic actuator of the flow control valve 22 increases, and as the duty ratio decreases, the fan rotation speed increases. begins to decline.
流量制御弁２２に与えられるパルス信号のデユーティ比
は電気式の制御装置４０により制御されるようになって
いる。The duty ratio of the pulse signal given to the flow control valve 22 is controlled by an electric control device 40.
制御装置４０は、水温センサ４２より内燃機関３６の冷
却水の温度に関する情報を、機関回転数センサ４４より
内燃機関３６の機関回転数に関する情報を、油温センサ
４６より前記作動液体の温度に関する情報を各々与えら
れ、第２図によく示されている如く、冷却水温度の上昇
に応じてポンプ３０より液圧モータ１６へ供給される作
動液体の流量を増大すべく流量制御弁２２の開弁量を決
定する冷却水温度対応開弁量決定手段５０と、機関回転
数より内燃機関３６が始動されたか否かを判別する機関
始動判別手段５２と、内燃機関３６が始動されてから所
定時間が経過したことを判別する機関始動経過時間判別
手段５４と、機開始動後経過時間°判別手段５４により
内燃機関３６が始動されてから所定時間が経過したと判
別されるまではポンプ３０より液圧モータ１６へ供給さ
れる作動液体の流量が最小値、例えば０になるように流
量制御弁２２へ所定のデユーティ比のパルス信号を出力
し、また機関始動後経過時間判別手段５４により内燃機
関３６が始動されてから所定時間が経過したと判別され
た時には冷却水温度対応開弁量決定手段５０により決定
された開弁量をもって流量制御弁２２が開弁ずべく所定
のデユーティ比のパルス信号を流量制御弁２２へ出力す
る開弁量制御信号出力手段５６とを有している。The control device 40 receives information regarding the temperature of the cooling water of the internal combustion engine 36 from the water temperature sensor 42, information regarding the engine speed of the internal combustion engine 36 from the engine speed sensor 44, and information regarding the temperature of the working fluid from the oil temperature sensor 46. As shown in FIG. 2, the flow rate control valve 22 is opened in order to increase the flow rate of the working fluid supplied from the pump 30 to the hydraulic motor 16 in accordance with the rise in cooling water temperature. A valve opening amount determination means 50 corresponding to the cooling water temperature determines the opening amount, an engine start determination means 52 determines whether or not the internal combustion engine 36 has been started based on the engine rotation speed, and a predetermined time period has elapsed since the internal combustion engine 36 has been started. The engine start elapsed time determining means 54 determines that a predetermined time has elapsed since the internal combustion engine 36 is started, and the engine starting elapsed time determining means 54 determines that a predetermined time has elapsed since the internal combustion engine 36 is started. A pulse signal with a predetermined duty ratio is output to the flow rate control valve 22 so that the flow rate of the working fluid supplied to the motor 16 becomes a minimum value, for example 0, and the internal combustion engine 36 is determined by the elapsed time determination means 54 after engine startup. When it is determined that a predetermined time has elapsed since the start, the flow rate control valve 22 sends a pulse signal with a predetermined duty ratio to the flow rate in order to open the valve with the valve opening amount determined by the cooling water temperature corresponding valve opening amount determining means 50. It has valve opening amount control signal output means 56 that outputs to the control valve 22.
冷却水温度対応開弁量決定手段５０は、第３図に示され
ている如く、概ね冷却水温度の上昇に応じて流量制御弁
開度りを増大、即ちポンプ３０より液圧モータ１６へ供
給される作動液体の流量を増大すべく決定するようにな
っている。As shown in FIG. 3, the valve opening amount determining means 50 corresponding to the cooling water temperature increases the opening amount of the flow rate control valve in accordance with the increase in the cooling water temperature, that is, the valve opening amount determining means 50 increases the opening amount of the flow rate control valve according to the rise in the cooling water temperature, that is, the valve opening amount determining means 50 increases the opening amount of the flow rate control valve according to the rise in the cooling water temperature, that is, the valve opening amount determining means 50 increases the opening amount of the flow rate control valve in accordance with the increase in the cooling water temperature. A determination is made to increase the flow rate of the working fluid applied.
機関始動後経過時間判別手段５４により判別される機関
始動後経過時間の基準時間、即ちオフ時間Ｔ ｓｅｔは
油温センサ４６により検出される前記作動液体の温度に
応じて、例えば第４図に示されている如く、可変設定さ
れてよく、これは油温の上昇に応じて低減されてよい。The reference time of the elapsed time after engine start determined by the elapsed time after engine start determining means 54, that is, the off time T set, is determined according to the temperature of the working fluid detected by the oil temperature sensor 46, for example as shown in FIG. It may be set variably, as shown in the figure, and this may be reduced as the oil temperature increases.
但し、このオフ時間Ｔ ｓｅｔは０に設定されることは
ない。However, this off time T set is never set to 0.
これにより、前記作動液体の温度が如何なる温度であっ
ても機関始動後に所定のオフ時間Ｔ ｓｅｔが経過する
までは必ず液圧モータ１６に対し作動液体が供給される
ことが禁止され、ポンプ３０が吐出する作動液体は全て
リリーフされることになる。これにより機関始動直後に
於て、ポンプ３０の摺動運動部に作動液体がよく馴染む
以前に液圧が上昇することが回避され、ポンプ摺動運動
部の機関的負担が軽減され、ポンプ３０の耐久性が向上
するようになる。As a result, no matter what the temperature of the working fluid is, the supply of working fluid to the hydraulic motor 16 is always prohibited until the predetermined off time T set has elapsed after the engine is started, and the pump 30 is All of the working fluid to be discharged will be relieved. This prevents the hydraulic pressure from increasing immediately after the engine is started, before the working fluid is well adapted to the sliding parts of the pump 30, reducing the mechanical load on the pump sliding parts, and reducing the mechanical load on the pump 30. Durability will improve.
第５図は上述の如き作動を行う本発明による回転速度制
御装置の制御ステップの一例を示している。FIG. 5 shows an example of the control steps of the rotational speed control device according to the present invention, which operates as described above.
上述の実施例に於ては、流量制御弁２２はポンプ３０に
連設されているが、これは第６図に示されている如く、
液圧モータ１６をバイパスして設けられたバイパス導管
１７の途中に設けられていてもよい。In the embodiment described above, the flow control valve 22 is connected to the pump 30, as shown in FIG.
It may be provided in the middle of a bypass conduit 17 provided to bypass the hydraulic motor 16.
以上に於ては、本発明を特定の実施例について詳細に説
明したが、本発明は、これに限定されるものではなく、
本発明の範囲内にて種々の実施例が可能であることは当
業者にとって明らかであろう。Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that various embodiments are possible within the scope of the invention.
第１図は本発明による回転速度制御装置を備えた液圧駆
動式冷却ファンの一つの実施例を示す概略構成図、第２
図は本発明による冷却ファンの回転速度制御装置の一つ
の実施例を示すブロック線図、第３図及び第４図は各々
本発明による冷却ファンの回転速度制御装置のファン制
御特性を示すグラフ、第５図は本発明による冷却ファン
の回転速度制御装置の制御要領を示すフローチャート、
第６図は本発明による回転速度制御装置を備えた液圧駆
動式冷却ファン装置の他の一つの実施例を示す概略構成
図である。
１０・・・冷却ファン、１２・・・機関冷却用ラジェー
タ、１６・・・液圧モータ、１７・・・バイパス導管、
１８・・・作動液体入口、２０・・・導管、２２・・・
流量制御弁、２４・・・作動液体出口、２６・・・導管
、２８・・・リザーブタンク、３０・・・ポンプ、３２
・・・導管、３４・・・ベルト式伝動装置、３６・・・
内燃機関、４０・・・制御装置、４２・・・水温センサ
、４４・・・機関回転数センサ、４６・・・油温センサ
、５０・・・冷却水温度対応開弁量決定手段、５２・・
・機関始動判別手段、５４・・・機関始動後経過時間判
別手段、５６・・・開弁量制御信号出力手段
特 許 出 願 人 トヨタ自動車株式会社代
理 人 弁理士 明石 昌毅第３図
第５図FIG. 1 is a schematic configuration diagram showing one embodiment of a hydraulically driven cooling fan equipped with a rotation speed control device according to the present invention, and FIG.
The figure is a block diagram showing one embodiment of the cooling fan rotation speed control device according to the present invention, and FIGS. 3 and 4 are graphs showing fan control characteristics of the cooling fan rotation speed control device according to the present invention, respectively. FIG. 5 is a flowchart showing the control procedure of the cooling fan rotation speed control device according to the present invention;
FIG. 6 is a schematic diagram showing another embodiment of a hydraulically driven cooling fan device equipped with a rotational speed control device according to the present invention. 10... Cooling fan, 12... Engine cooling radiator, 16... Hydraulic motor, 17... Bypass conduit,
18... Working liquid inlet, 20... Conduit, 22...
Flow rate control valve, 24... Working liquid outlet, 26... Conduit, 28... Reserve tank, 30... Pump, 32
...Conduit, 34...Belt type transmission, 36...
Internal combustion engine, 40... Control device, 42... Water temperature sensor, 44... Engine rotation speed sensor, 46... Oil temperature sensor, 50... Valve opening amount determining means corresponding to cooling water temperature, 52.・
・Engine start determination means, 54... Time elapsed time determination means after engine start, 56... Valve opening amount control signal output means Patent Applicant Toyota Motor Corporation representative
Patent Attorney Masatake AkashiFigure 3
Figure 5
Claims (1)
じて回転速度を制御される冷却ファンの回転速度制御装
置に於て、前記ポンプより前記液圧モータへ供給される
作動液体の流量とリリーフ流量とを互いに相反する関係
にて増減制御する流量制御弁と、機関冷却用の冷却水の
温度を検出する冷却水温度検出手段と、冷却水温度の上
昇に応じて前記ポンプより前記液圧モータへ供給される
作動液体の流量を増大すべく前記流量制御弁の開弁量を
決定する冷却水温度対応開弁量決定手段と、内燃機関が
始動されてから所定時間が経過したことを判別する機関
始動後経過時間判別手段と、前記機関始動後経過時間判
別手段により内燃機関が始動されてから所定時間が経過
したと判別されるまでは前記ポンプより前記液圧モータ
へ供給される作動液体の流量が最小値になるように前記
流量制御弁へ開弁量制御信号を出力し且前記機関始動後
経過時間判別手段により内燃機関が始動されてから所定
時間が経過したと判別された時には前記冷却水温度対応
開弁量決定手段により決定された開弁量をもって前記流
量制御弁が開弁すべく開弁量制御信号を前記流量制御弁
へ出力する開弁量制御信号出力手段とを有する内燃機関
の液圧駆動式冷却ファンの回転速度制御装置。In a cooling fan rotation speed control device whose rotation speed is controlled according to the flow rate of working fluid supplied from the pump to the hydraulic motor, the flow rate and relief of the working fluid supplied from the pump to the hydraulic motor are controlled. a flow rate control valve that increases or decreases the flow rate in a mutually contradictory relationship; a cooling water temperature detection means that detects the temperature of cooling water for cooling the engine; cooling water temperature-based valve opening amount determining means for determining the opening amount of the flow rate control valve in order to increase the flow rate of the working fluid supplied to the engine; A time elapsed time since engine start determination means and a time elapsed time since engine start determination means determine that the working fluid supplied from the pump to the hydraulic motor until it is determined that a predetermined time has elapsed since the internal combustion engine was started. A valve opening amount control signal is output to the flow rate control valve so that the flow rate becomes a minimum value, and when the elapsed time after engine start determining means determines that a predetermined time has elapsed since the internal combustion engine was started, the cooling is performed. and a valve opening amount control signal output means for outputting a valve opening amount control signal to the flow rate control valve so that the flow rate control valve opens with the valve opening amount determined by the water temperature corresponding valve opening amount determining means. A rotation speed control device for the engine's hydraulically driven cooling fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30670087A JPH01147113A (en) | 1987-12-03 | 1987-12-03 | Rotational speed controller of hydraulic driving cooling fan for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30670087A JPH01147113A (en) | 1987-12-03 | 1987-12-03 | Rotational speed controller of hydraulic driving cooling fan for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01147113A true JPH01147113A (en) | 1989-06-08 |
Family
ID=17960252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30670087A Pending JPH01147113A (en) | 1987-12-03 | 1987-12-03 | Rotational speed controller of hydraulic driving cooling fan for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01147113A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005024199A1 (en) * | 2003-08-29 | 2005-03-17 | Shin Caterpillar Mitsubishi Ltd. | Rotational speed control method of fan |
| CN100435468C (en) * | 2005-08-31 | 2008-11-19 | 台达电子工业股份有限公司 | Fan control device and method |
| JP2011021615A (en) * | 2010-11-05 | 2011-02-03 | Komatsu Ltd | Control device and control method of hydraulic drive fan for cooling |
-
1987
- 1987-12-03 JP JP30670087A patent/JPH01147113A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005024199A1 (en) * | 2003-08-29 | 2005-03-17 | Shin Caterpillar Mitsubishi Ltd. | Rotational speed control method of fan |
| KR100688854B1 (en) * | 2003-08-29 | 2007-03-02 | 신갸타피라 미쓰비시 가부시키가이샤 | Fan revolution speed control method |
| US7275368B2 (en) | 2003-08-29 | 2007-10-02 | Shin Caterpillar Mitsubishi Ltd. | Fan revolution speed control method |
| CN100435468C (en) * | 2005-08-31 | 2008-11-19 | 台达电子工业股份有限公司 | Fan control device and method |
| JP2011021615A (en) * | 2010-11-05 | 2011-02-03 | Komatsu Ltd | Control device and control method of hydraulic drive fan for cooling |
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