JPH04187856A - Exhaust heat recovery device of engine - Google Patents

Exhaust heat recovery device of engine

Info

Publication number
JPH04187856A
JPH04187856A JP2316818A JP31681890A JPH04187856A JP H04187856 A JPH04187856 A JP H04187856A JP 2316818 A JP2316818 A JP 2316818A JP 31681890 A JP31681890 A JP 31681890A JP H04187856 A JPH04187856 A JP H04187856A
Authority
JP
Japan
Prior art keywords
heat radiation
temperature
engine
cooling water
way valve
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.)
Granted
Application number
JP2316818A
Other languages
Japanese (ja)
Other versions
JP2683955B2 (en
Inventor
Tomoaki Imamura
友昭 今村
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.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP2316818A priority Critical patent/JP2683955B2/en
Publication of JPH04187856A publication Critical patent/JPH04187856A/en
Application granted granted Critical
Publication of JP2683955B2 publication Critical patent/JP2683955B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/14Combined heat and power generation [CHP]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Landscapes

  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To prevent generation of any power loss during the initial phase of reoperation by setting, on a heat radiation controlling device, a temperature for starting fan operation lower than a set temperature for heat radiation and operating a cooling fan in the case when a three way valve is switched to heat radiation side, and the temperature of cooling water is equal to or more than a set-temperature for starting fan operation. CONSTITUTION:A three way valve 6 is linked, with its possibility to be controlled in operation, to a temperature sensor 7 provided in an engine cooling water passage 3 through a heat radiation control device 8 inside a system controller 10, and, on the other hand, a limit switch 9 for detecting heat radiating operation is provided on the three way valve 6 and linked to the cooling fans 5b of heat radiation devices 5 through the heat radiation controlling device 8. Each cooling fan 5b is operated by a limit switch 9 through the heat radiation control device 8, in the case when a set temperature T2 for starting fan operation is set lower than a set temperature T1 for heat radiation in the heat radiation control device 8, and the temperature of engine cooling water is equal to or more than the set temperature T2 for starting fan operation. In the case when the system is reoperated, if the temperature of the engine is lower than the set temperature T2 for starting fan operation, the cooling fan 5b is not operated so as to prevent generation of any power loss during the initial phase of reoperation.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、エンジン発電機やコージェネレーションシス
テムにおけるエンジンの排熱回収装置に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust heat recovery device for an engine in an engine generator or a cogeneration system.

(前提となる基本構造) エンジンにより発電機を回転させて発生する電力を利用
するエンジン発電機や、エンジン運転中に発生する熱エ
ネルギーを排熱回収用熱交換器により回収して、電力と
並行利用するコージェネレーションシステムにおいては
、エンジンの排熱回収装置は、基本構造として第1図に
示すように次のような構成となっている。
(Basic structure as a premise) An engine generator that uses the electric power generated by rotating a generator with the engine, and a heat exchanger for recovering exhaust heat that recovers the thermal energy generated during engine operation and generates electricity in parallel. In the cogeneration system used, the engine exhaust heat recovery device has the following basic structure as shown in FIG.

すなわち、エンジン1のウォータジャケット1aには、
温水路3 a %排熱回収用熱交換器4の授熱路4a、
冷水路3bを順に循環状に接続してエンジン冷却水路3
を構成し、そのエンジン冷却水路3に可変分流用三方弁
6で上記授熱路4aと放熱装置5の放熱路5aとを並列
に接続し、エンジン冷却水を分流可能にしである。
That is, in the water jacket 1a of the engine 1,
Hot water channel 3a %Heat transfer channel 4a of heat exchanger 4 for waste heat recovery,
The engine cooling waterways 3 are connected by sequentially connecting the cold waterways 3b in a circular manner.
The heat transfer path 4a and the heat radiation path 5a of the heat radiation device 5 are connected in parallel to the engine cooling water channel 3 by a variable diversion three-way valve 6, so that the engine cooling water can be divided.

さらに、上記エンジン冷却水路3に、エンジン冷却水の
温度センサ7を設け、この温度センサ7にシステムコン
トローラ10内の放熱制御装置8を介して上記三方弁6
を制御操作可能に連携し、又、上記三方弁6に、放熱操
作検出用のリミットスイッチ9を付設し、このリミット
スイッチ9に上記放熱制御装置8を介して放熱装置5の
冷却ファン5bを連携しである。
Further, an engine cooling water temperature sensor 7 is provided in the engine cooling water channel 3, and the temperature sensor 7 is connected to the three-way valve 6 via the heat radiation control device 8 in the system controller 10.
In addition, a limit switch 9 for detecting heat radiation operation is attached to the three-way valve 6, and the cooling fan 5b of the heat radiation device 5 is linked to the limit switch 9 via the heat radiation control device 8. It is.

上記システムコントローラ1oの制御動作のうち、放熱
制御装置8による冷却ファン5bの運転制御は次のよう
に作動する。
Among the control operations of the system controller 1o, the operation control of the cooling fan 5b by the heat radiation control device 8 operates as follows.

前記エンジン冷却水路3のエンジン冷却水温度が放熱用
設定温度TIよりも高くなった場合には、前記温度セン
サ7が前記放熱制御装置8を介して前記三方弁6を放熱
側へ操作してエンジン冷却水を放熱路5a側へ操作する
とともに、この操作状態を前記リミットスイッチ9が検
出することに基づいて、上記放熱制御装置8が前記冷却
ファン5bを運転させる。
When the temperature of the engine cooling water in the engine cooling water passage 3 becomes higher than the set temperature for heat radiation TI, the temperature sensor 7 operates the three-way valve 6 to the heat radiation side via the heat radiation control device 8 to stop the engine. The heat radiation control device 8 operates the cooling fan 5b based on the limit switch 9 detecting the operating state of the cooling water while operating the cooling water toward the heat radiation path 5a side.

これに対して、前記エンジン冷却水路3のエンジン冷却
水温度が前記放熱用設定温度T1よりも低くなった場合
には、前記温度センサ7が前記放熱制御装置8を介して
前記三方弁6を放熱解除側へ操作するとともに、この操
作状態を前記リミットスイッチ9が検出することに基づ
いて、前記冷却ファン5bを一定の遅延時間Di後に停
止させる。
On the other hand, when the engine cooling water temperature of the engine cooling water channel 3 becomes lower than the heat radiation set temperature T1, the temperature sensor 7 causes the three-way valve 6 to radiate heat via the heat radiation control device 8. The cooling fan 5b is operated to the release side, and based on the limit switch 9 detecting this operating state, the cooling fan 5b is stopped after a certain delay time Di.

これにより、放熱装置5の余熱で冷却ファン5bのファ
ンモータ5Cが劣化するのを防止する。
This prevents the fan motor 5C of the cooling fan 5b from deteriorating due to residual heat from the heat radiating device 5.

(従来の技術) このように、従来は三方弁のリミットスイッチだけで冷
却ファンの運転を制御していた。
(Prior Art) As described above, in the past, the operation of the cooling fan was controlled only by the limit switch of the three-way valve.

(発明が解決しようとする課題) 前述のような従来例の基本構造における放熱装置の冷却
ファンの運転制御は、エンジン冷却水温度が放熱用設定
温度TI(例えば約90℃)以上の場合、三方弁6でエ
ンジン冷却水を放熱装置5側に分流させるが、第4図の
動作フローチャートに示すように三方弁6は放熱装置5
に分流する状態のままで停止し、従ってリミットスイッ
チ9もオン状態のままで停止するようになっていた。
(Problems to be Solved by the Invention) Operation control of the cooling fan of the heat dissipation device in the basic structure of the conventional example as described above is such that when the engine cooling water temperature is higher than the heat dissipation set temperature TI (for example, about 90°C), the cooling fan is operated in three directions. The valve 6 diverts the engine cooling water to the heat radiator 5, and as shown in the operation flowchart in FIG.
Therefore, the limit switch 9 also stops with the limit switch 9 in the on state.

上述のような熱間停止後にシステムを再運転しようとす
る場合、従来技術では次の問題がある。
When trying to restart the system after a hot shutdown as described above, the conventional technology has the following problems.

三方弁のリミットスイッチがオンのままとなっているか
ら、エンジンの温度が放熱用設定温度よりも低い時でも
、第4図に示すように放熱装置の冷却ファンが最初から
運転する。
Since the limit switch of the three-way valve remains on, even when the engine temperature is lower than the set temperature for heat radiation, the cooling fan of the heat radiation device operates from the beginning as shown in FIG. 4.

そして、冷却ファンはエンジン冷却水路の温度センサで
エンジン冷却水温度が低いことを検出して、三方弁が放
熱解除側に作動してリミットスイッチがオフとなってか
ら、一定の遅延時間後にやっと停止する。
Then, the cooling fan finally stops after a certain delay time after the engine cooling water temperature sensor detects that the engine cooling water temperature is low, the three-way valve operates to release the heat radiation, and the limit switch turns off. do.

このため、再運転時の初期に冷却ファンの運転による動
力ロスが発生していた。
For this reason, a power loss occurred due to the operation of the cooling fan at the beginning of the restart.

本発明は、このような従来技術における問題点を解消す
ることを課題とする。
It is an object of the present invention to solve these problems in the prior art.

(課題を解決するための手段) 本発明は上記課題を達成するために、放熱制御装置に、
放熱用設定温度よりも低いファン運転開始用設定温度を
設け、三方弁が放熱側へ操作されたことをリミットスイ
ッチにより検出するとともに、エンジン冷却水温度がフ
ァン運転開始用設定温度以上の場合に、放熱制御装置が
放熱装置の冷却ファンを運転させるようにしたものであ
る。
(Means for Solving the Problems) In order to achieve the above problems, the present invention provides a heat radiation control device that includes:
A set temperature for starting fan operation is set lower than the set temperature for heat radiation, and a limit switch detects when the three-way valve is operated to the heat radiation side, and when the engine cooling water temperature is higher than the set temperature for starting fan operation, The heat radiation control device operates the cooling fan of the heat radiation device.

(作用) 本発明は次のように作用する。(effect) The invention works as follows.

第3図の動作フローチャートに示すように、熱間停止後
にシステムを再運転しようとする場合、三方弁のリミッ
トスイッチがオンのままとなっていても、先に、エンジ
ン冷却水路の温度センサでエンジン冷却水温度がファン
運転開始用設定温度T2(例えば約70℃)よりも高い
ことを検出してから、冷却ファンを回転させ、エンジン
の温度がファン運転開始用設定温度T2よりも低い時に
は、放熱制御装置が放熱装置の冷却ファンを停止状態に
−して運転させない。
As shown in the operation flowchart in Figure 3, when attempting to restart the system after a hot shutdown, even if the three-way valve limit switch remains on, the engine cooling water temperature sensor must first After detecting that the cooling water temperature is higher than the set temperature T2 for starting fan operation (e.g. about 70°C), the cooling fan is rotated, and when the engine temperature is lower than the set temperature T2 for starting fan operation, the heat is released. The control device stops the cooling fan of the heat dissipation device and does not allow it to operate.

(発明の効果) 本発明は、上記のように構成され作用することから、熱
間停止後にシステムを再運転しようとすル場合、エンジ
ンの温度がファン運転開始用設定温度(例えば約70℃
)よりも低い時には冷却ファンが運転せず、このため、
再運転時の初期に冷却ファンの運転による動力ロスが発
生しない。
(Effects of the Invention) Since the present invention is configured and operates as described above, when the system is restarted after a hot stop, the engine temperature is set at the set temperature for starting fan operation (for example, about 70°C).
), the cooling fan does not operate, and for this reason,
Power loss due to cooling fan operation does not occur during the initial stage of restart.

(実施例) 以下、本発明の実施例を図面で説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第1図に示すエンジンの排熱回収装置の要部構成図にお
いて、発電機2を連結したエンジン1は燃料ガス人口1
1から燃料ガスを供給して運転され、マフラー12を介
して排気ガスを排出する。
In the main part configuration diagram of the engine exhaust heat recovery device shown in FIG. 1, the engine 1 connected to the generator 2 has a fuel gas population of 1
It is operated by supplying fuel gas from 1, and exhaust gas is discharged through a muffler 12.

そして、発電機2で発生した電力は配電盤13から各負
荷へ供給される。
Then, the power generated by the generator 2 is supplied from the power distribution board 13 to each load.

又、エンジンlにはその回転軸にファン1bが設けられ
ていてエンジン外周を空冷する。
Further, the engine 1 is provided with a fan 1b on its rotating shaft to air-cool the outer periphery of the engine.

エンジン1のウォータジャケット1aには、温水路3a
s排熱回収用熱交換器4の授熱路4as冷水路3bを順
に循環状に接続してエンジン冷却水路3を構成し、その
エンジン冷却水路3に可変分流用三方弁6で授熱路4a
と放熱装置5の放熱路5aとを並列に接続し、エンジン
冷却水ポンプ1cで圧送されるエンジン冷却水を分流可
能にしである。
The water jacket 1a of the engine 1 includes a warm water channel 3a.
The heat transfer path 4as and the cold water path 3b of the exhaust heat recovery heat exchanger 4 are sequentially connected in a circular manner to constitute the engine cooling path 3, and the heat transfer path 4a is connected to the engine cooling path 3 by a variable diversion three-way valve 6.
and the heat radiation path 5a of the heat radiation device 5 are connected in parallel, so that the engine cooling water pumped by the engine cooling water pump 1c can be divided.

排熱回収用熱交換器4には温水人口14と温水出口15
とがあり、授熱路4aを通るエンジン冷却水の温熱を吸
収して利用するようになっている。
The heat exchanger 4 for exhaust heat recovery has a hot water outlet 14 and a hot water outlet 15.
It absorbs and utilizes the heat of the engine cooling water passing through the heat transfer path 4a.

又、排気ガスの熱を回収するために、排ガス熱交換器4
bがエンジン1の排気部に直接付設されている。
In addition, in order to recover the heat of the exhaust gas, an exhaust gas heat exchanger 4 is installed.
b is attached directly to the exhaust part of the engine 1.

エンジン冷却水は、始動時などで冷却水温度が一定値以
下の時にエンジン冷却水路3に設置されたサーモスタッ
ト3Cで、バイパス路3dをバイパスし、冷却水温度が
一定値以上になった時バイパスを止めて通常水路を流れ
る。
When the engine cooling water temperature is below a certain value, such as during startup, the thermostat 3C installed in the engine cooling water passage 3 bypasses the bypass passage 3d, and when the cooling water temperature exceeds a certain value, the engine cooling water is bypassed. It stops and flows normally through the waterway.

さらに、エンジン冷却水路3には、エンジン冷却水の温
度センサ7を設け、この温度センサ7にシステムコント
ローラ10内の放熱制御装置8を介して三方弁6を制御
操作可能に連携し、又、三方弁6に放熱操作検出用のリ
ミットスイッチ9を付設し、このリミットスイッチ9に
放熱制御装置8を介して放熱装置5の冷却ファン5bを
連携しである。
Further, the engine cooling water passage 3 is provided with an engine cooling water temperature sensor 7, which is linked to the temperature sensor 7 so as to be able to control and operate the three-way valve 6 via the heat radiation control device 8 in the system controller 10. A limit switch 9 for detecting heat dissipation operation is attached to the valve 6, and the cooling fan 5b of the heat dissipation device 5 is linked to the limit switch 9 via the heat dissipation control device 8.

そして、放熱制御装置8には、エンジン冷却水路3のエ
ンジン冷却水温度について放熱用設定温度TI(例えば
約90℃)よりも低いファン運転開始用設定温度T2(
例えば約70℃)を設け、エンジン冷却水温度がファン
運転開始用設定温度T2以上の場合に、リミトスイッチ
9が放熱制御装置8を介して冷却ファン5bを運転させ
るようにしである。
Then, the heat radiation control device 8 has a temperature setting temperature T2 for starting fan operation that is lower than the temperature setting temperature TI for heat radiation (for example, about 90° C.) regarding the temperature of the engine cooling water in the engine cooling water channel 3.
For example, about 70° C.), and when the engine cooling water temperature is equal to or higher than the set temperature T2 for starting fan operation, the limit switch 9 operates the cooling fan 5b via the heat radiation control device 8.

システムコントローラ10は図示しない中央演算処理装
置と各種操作スイッチ及び継電器などを備えていて、シ
ステム内の各部からの温度、圧力、電圧又は回転数など
の入力信号や、各部への運転、停止、又は警報などの指
令信号を送受して継電器や操作スイッチを作動させる事
により、システムの運転を制御している。
The system controller 10 is equipped with a central processing unit (not shown), various operation switches, relays, etc., and receives input signals such as temperature, pressure, voltage, or rotational speed from each part in the system, and controls operation, stop, and operation of each part. System operation is controlled by transmitting and receiving command signals such as alarms and activating relays and operation switches.

このシステムコントローラ10の制御動作のうち、放熱
制御装置8による冷却ファン5bの運転制御は次のよう
に作動する。
Among the control operations of the system controller 10, the operation control of the cooling fan 5b by the heat radiation control device 8 operates as follows.

第2図に示す動作ブロック線図及び第3図に示す動作フ
ローチャートにおいて、エンジン冷却水路3のエンジン
冷却水温度が放熱用設定温度T1よりも高くなった場合
(即ち、ファン運転開始用設定温度T2以上の場合)に
は、温度センサ7が放熱制御装置8を介して三方弁6を
放熱側へ操作してエンジン冷却水を放熱路5a側へ操作
するとともに、この操作状態をリミットスイッチ9が検
出することに基づいて、放熱制御装置8か冷却ファン5
bを運転させる。
In the operation block diagram shown in FIG. 2 and the operation flowchart shown in FIG. In the above case), the temperature sensor 7 operates the three-way valve 6 to the heat radiation side via the heat radiation control device 8 to operate the engine cooling water to the heat radiation path 5a side, and the limit switch 9 detects this operation state. Depending on the operation, the heat radiation control device 8 or the cooling fan 5
Let b drive.

これに対して、エンジン冷却水路3のエンジン冷却水温
度が放熱用設定温度T1よりも低くなった場合には、温
度センサ7が放熱制御装置8を介して三方弁6を放熱解
除側へ操作するとともに、この操作状態をリミットスイ
ッチ9が検出することに基づいて、冷却ファン5bを一
定の遅延時間DI(例えば約5分間)後に停止させる。
On the other hand, when the engine cooling water temperature of the engine cooling water channel 3 becomes lower than the heat radiation set temperature T1, the temperature sensor 7 operates the three-way valve 6 to the heat radiation release side via the heat radiation control device 8. At the same time, based on the limit switch 9 detecting this operating state, the cooling fan 5b is stopped after a certain delay time DI (for example, about 5 minutes).

これにより放熱装置5の余熱で冷却ファン5bのファン
モータ5cが劣化するのを防止する。
This prevents the fan motor 5c of the cooling fan 5b from deteriorating due to residual heat from the heat radiating device 5.

さらに、放熱状態でシステムを停止した後一定の遅延時
間Dl後に冷却ファン5bが停止し、その後システムを
再運転しようとする場合、三方弁6のリミットスイッチ
9がオンのままとなっていても、第3図に示すように、
先に、エンジン冷却水路3の温度センサ7でエンジン冷
却水温度がファン運転開始用設定温度T2よりも高いこ
とを検出してから、冷却ファン5bを運転させるがら、
エンジン冷却水温度がファン運転開始用設定温度T2よ
りも低い時には、放熱制御装置8が冷却ファン5bを停
止状態にして運転させない。
Furthermore, when the cooling fan 5b stops after a certain delay time Dl after the system is stopped in a heat dissipation state, and the system is then restarted, even if the limit switch 9 of the three-way valve 6 remains on, As shown in Figure 3,
First, the temperature sensor 7 of the engine cooling waterway 3 detects that the engine cooling water temperature is higher than the set temperature T2 for starting fan operation, and then, while operating the cooling fan 5b,
When the engine cooling water temperature is lower than the set temperature T2 for starting fan operation, the heat radiation control device 8 stops the cooling fan 5b and does not operate it.

このため、再運転時の初期に冷却ファンの運転による動
力ロスが発生しない。
Therefore, power loss due to operation of the cooling fan does not occur in the initial stage of restarting.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図から第3図は本発明の実施例を示し、第1図はエ
ンジンの排熱回収装置の要部構成図、第2図は動作ブロ
ック線図、第3図は動作フローチャートである。 第4図は従来例の動作フローチャートである。 ■・・・エンジン、1a・・・ウォータジャケット、3
・・・エンジン冷却水路、3a・・・温水路、3b・・
・冷水路、4・・・排熱回収用熱交換閤、4a・・・授
熱路、5・・・放熱装置、5a・・・放熱路、5b・・
・冷却ファン、6・・・可変分流用三方弁、7・・・温
度センサ、8・・・放熱制御装置、9・・・リミットス
イッチ、Dl・・・遅延時間、T1・・・放熱用設定温
度、T2・・・ファン運転開始用設定温度。
1 to 3 show an embodiment of the present invention, in which FIG. 1 is a block diagram of main parts of an engine exhaust heat recovery device, FIG. 2 is an operational block diagram, and FIG. 3 is an operational flowchart. FIG. 4 is an operational flowchart of the conventional example. ■...Engine, 1a...Water jacket, 3
...Engine cooling waterway, 3a...Warm waterway, 3b...
・Cold channel, 4... Heat exchanger for exhaust heat recovery, 4a... Heat transfer path, 5... Heat radiation device, 5a... Heat radiation path, 5b...
・Cooling fan, 6... Three-way valve for variable flow diversion, 7... Temperature sensor, 8... Heat radiation control device, 9... Limit switch, Dl... Delay time, T1... Setting for heat radiation Temperature, T2... Set temperature for starting fan operation.

Claims (1)

【特許請求の範囲】 1、エンジン(1)のウォータジャケット(1a)に、
温水路(3a)・排熱回収用熱交換器(4)の授熱路(
4a)・冷水路(3b)を順に循環状に接続し、上記授
熱路(4a)に放熱装置(5)の放熱路(5a)を並列
に接続し、 上記ウォータジャケット(1a)と温水路(3a)と冷
水路(3b)とからなるエンジン冷却水路(3)に対し
て、上記授熱路(4a)と放熱路(5a)とを、可変分
流用三方弁(6)でエンジン冷却水を分流可能に構成し
、 上記エンジン冷却水路(3)に、エンジン冷却水の温度
センサ(7)を設け、この温度センサ(7)に放熱制御
装置(8)を介して上記三方弁(6)を制御操作可能に
連携し、 上記三方弁(6)に、放熱操作検出用のリミットスイッ
チ(9)を付設し、このリミットスイッチ(9)に上記
放熱制御装置(8)を介して冷却ファン(5b)を連携
し、 前記エンジン冷却水路(3)のエンジン冷却水温度が放
熱用設定温度(T1)よりも高くなった場合には、前記
温度センサ(7)が前記放熱制御装置(8)を介して前
記三方弁(6)を放熱側へ操作するとともに、この操作
状態を前記リミットスイッチ(9)が検出することに基
づいて、上記放熱制御装置(8)が前記冷却ファン(5
b)を運転させ、 これに対して、前記エンジン冷却水路(3)のエンジン
冷却水温度が前記放熱用設定温度(T1)よりも低くな
った場合には、前記温度センサ(7)が前記放熱制御装
置(8)を介して前記三方弁(6)を放熱解除側へ操作
するとともに、この操作状態を前記リミットスイッチ(
9)が検出することに基づいて、前記冷却ファン(5b
)を遅延時間(D1)後に停止させる、エンジンの排熱
回収装置において、 上記放熱制御装置(8)に、前記放熱用設定温度(T1
)よりも低いファン運転開始用設定温度(T2)を設け
、前記三方弁(6)が放熱側へ操作されたことを前記リ
ミットスイッチ(9)により検出するとともに、エンジ
ン冷却水温度が上記ファン運転開始用設定温度(T2)
以上の場合に、前記放熱制御装置(8)が前記冷却ファ
ン(5b)を運転させる、 ことを特徴とするエンジンの排熱回収装置。
[Claims] 1. In the water jacket (1a) of the engine (1),
Heat transfer path (3a) and heat exchanger (4) for exhaust heat recovery
4a) - The cold water channels (3b) are connected in a circular manner in order, and the heat radiation path (5a) of the heat radiating device (5) is connected in parallel to the heat transfer path (4a), and the water jacket (1a) and the hot water channel are connected in parallel. The heat transfer path (4a) and the heat radiation path (5a) are connected to the engine cooling water path (3) consisting of the engine cooling water path (3a) and the cold water path (3b) using a variable diversion three-way valve (6). An engine cooling water temperature sensor (7) is provided in the engine cooling water channel (3), and the temperature sensor (7) is connected to the three-way valve (6) via a heat radiation control device (8). A limit switch (9) for detecting heat radiation operation is attached to the three-way valve (6), and a cooling fan ( 5b), and when the engine cooling water temperature of the engine cooling waterway (3) becomes higher than the heat radiation set temperature (T1), the temperature sensor (7) controls the heat radiation control device (8). The three-way valve (6) is operated to the heat radiation side via the three-way valve (6), and based on the limit switch (9) detecting this operation state, the heat radiation control device (8) controls the cooling fan (5).
b), and on the other hand, when the engine cooling water temperature of the engine cooling waterway (3) becomes lower than the heat radiation set temperature (T1), the temperature sensor (7) detects the heat radiation temperature. The three-way valve (6) is operated to the heat radiation release side via the control device (8), and this operating state is changed to the limit switch (
9), the cooling fan (5b)
) is configured to stop the engine after a delay time (D1).
) is provided, and the limit switch (9) detects that the three-way valve (6) is operated to the heat radiation side, and the engine cooling water temperature is lower than the fan operation start temperature. Starting temperature setting (T2)
In the above case, the heat radiation control device (8) operates the cooling fan (5b), an exhaust heat recovery device for an engine.
JP2316818A 1990-11-20 1990-11-20 Engine exhaust heat recovery device Expired - Fee Related JP2683955B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2316818A JP2683955B2 (en) 1990-11-20 1990-11-20 Engine exhaust heat recovery device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2316818A JP2683955B2 (en) 1990-11-20 1990-11-20 Engine exhaust heat recovery device

Publications (2)

Publication Number Publication Date
JPH04187856A true JPH04187856A (en) 1992-07-06
JP2683955B2 JP2683955B2 (en) 1997-12-03

Family

ID=18081261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2316818A Expired - Fee Related JP2683955B2 (en) 1990-11-20 1990-11-20 Engine exhaust heat recovery device

Country Status (1)

Country Link
JP (1) JP2683955B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920521A (en) * 1982-07-26 1984-02-02 Isuzu Motors Ltd Cooling system controller for water-cooled internal combustion engine
JPH0255861A (en) * 1988-08-12 1990-02-26 Meidensha Corp Co-generation plant
JPH0299715A (en) * 1988-10-04 1990-04-11 Kubota Ltd Radiator fan operation control method of dual purpose electricity and steam generator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920521A (en) * 1982-07-26 1984-02-02 Isuzu Motors Ltd Cooling system controller for water-cooled internal combustion engine
JPH0255861A (en) * 1988-08-12 1990-02-26 Meidensha Corp Co-generation plant
JPH0299715A (en) * 1988-10-04 1990-04-11 Kubota Ltd Radiator fan operation control method of dual purpose electricity and steam generator

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Publication number Publication date
JP2683955B2 (en) 1997-12-03

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