JP2015081530A - Egr device - Google Patents

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JP2015081530A
JP2015081530A JP2013218789A JP2013218789A JP2015081530A JP 2015081530 A JP2015081530 A JP 2015081530A JP 2013218789 A JP2013218789 A JP 2013218789A JP 2013218789 A JP2013218789 A JP 2013218789A JP 2015081530 A JP2015081530 A JP 2015081530A
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temperature
egr
egr gas
engine
egr cooler
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修 藤城
Osamu Fujishiro
修 藤城
佳彦 杉浦
Yoshihiko Sugiura
佳彦 杉浦
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Denso Corp
Soken Inc
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Denso Corp
Nippon Soken Inc
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    • 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

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Abstract

PROBLEM TO BE SOLVED: To provide an EGR device that enables condensation of EGR gas to be suppressed even when low-temperature cooling water is supplied to an EGR cooler.SOLUTION: An EGR device 1 includes: an EGR cooler 4 exchanging heat between engine cooling water and EGR gas; temperature detection means 5 for detecting a temperature of the EGR gas that has passed through the EGR cooler 4; and temperature control means 6. The temperature control means 6 controls a flow rate of the engine cooling water flowing in the EGR cooler 4 on the basis of a temperature detected by the temperature detection means 5 to control the temperature of the EGR gas that has passed through the EGR cooler 4 within a predetermined temperature range. Thus, based on the temperature detected by the temperature detection means 5, the temperature of the EGR gas can be controlled within the predetermined temperature range, and while the temperature of the EGR gas is equal to or lower than a temperature that prevents deterioration of fuel economy of an engine 3, condensation of the EGR gas can be prevented. As a result, in the EGR device 1, even when low-temperature cooling water is supplied to the EGR cooler 4, condensation of the EGR gas can be prevented.

Description

本発明は、排気流路から吸気流路へ排気ガスの一部を戻すＥＧＲ装置に関する。   The present invention relates to an EGR device that returns a part of exhaust gas from an exhaust passage to an intake passage.

従来から、車両に搭載されたエンジンの排気流路から吸気流路へ排気ガスの一部を戻すＥＧＲ装置が周知である（以下、吸気流路に戻される排気ガスをＥＧＲガスと呼ぶ。）。
このＥＧＲガスは、エンジン冷却水によりＥＧＲクーラにより冷却されて吸気流路に戻される。 Conventionally, an EGR device that returns a part of exhaust gas from an exhaust passage of an engine mounted on a vehicle to an intake passage is known (hereinafter, the exhaust gas returned to the intake passage is referred to as EGR gas).
The EGR gas is cooled by the engine cooling water by the EGR cooler and returned to the intake passage.

近年、エンジンの燃費向上およびノッキング防止のため、エンジンの高負荷時に温度を低下させたエンジン冷却水を用い、エンジン冷却を行う試みが行われている（例えば、引用文献１参照。）。
このため、このような低温なエンジン冷却水の一部をＥＧＲクーラに導入し、ＥＧＲガスを冷却した場合、ＥＧＲガスが過度に冷却されＥＧＲガスが結露する虞がある。 In recent years, in order to improve engine fuel efficiency and prevent knocking, attempts have been made to cool the engine using engine cooling water whose temperature has been lowered when the engine is under high load (see, for example, Reference 1).
For this reason, when a part of such low-temperature engine cooling water is introduced into the EGR cooler and the EGR gas is cooled, the EGR gas may be excessively cooled and the EGR gas may be condensed.

なお、エンジンの早期暖気を目的として、ＥＧＲクーラに流す冷却水の流量を下げてＥＧＲガスの冷却を抑え、ＥＧＲガスの温度を上げる技術が公知となっている（例えば、引用文献２、３参照。）。しかし、これらの場合、エンジン冷却水の温度が高いため、ＥＧＲガスの結露は問題視されていない。   For the purpose of premature warming of the engine, a technique for increasing the temperature of the EGR gas by reducing the flow rate of the cooling water flowing to the EGR cooler to suppress the cooling of the EGR gas is known (see, for example, cited documents 2 and 3). .) However, in these cases, since the temperature of the engine coolant is high, the condensation of EGR gas is not regarded as a problem.

特開２０１２−５２５０４号公報JP 2012-52504 A 特開２００９−１０３０１４号公報JP 2009-103014 A 特開２００９−２２８５３０号公報JP 2009-228530 A

本発明は、上記の問題点を解決するためになされたものであり、その目的は、ＥＧＲ装置において、ＥＧＲクーラに低温冷却水が供給されても、ＥＧＲガスの結露を抑制することにある。   The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress dew condensation of EGR gas even when low-temperature cooling water is supplied to the EGR cooler in the EGR device.

本願の第１発明によれば、ＥＧＲ装置は、エンジン冷却水とＥＧＲガスとの間で熱交換を行うＥＧＲクーラと、ＥＧＲクーラ通過後のＥＧＲガスの温度を検出する温度検出手段と、温調手段とを備える。
ここで、温調手段は、温度検出手段により検出された温度に基づき、ＥＧＲクーラを流れるエンジン冷却水の流量を調整することにより、ＥＧＲクーラ通過後のＥＧＲガスの温度を所定の温度範囲に調整する。 According to the first invention of the present application, the EGR device includes an EGR cooler that performs heat exchange between the engine coolant and the EGR gas, a temperature detection unit that detects the temperature of the EGR gas after passing through the EGR cooler, and a temperature control. Means.
Here, the temperature adjusting means adjusts the temperature of the EGR gas after passing through the EGR cooler to a predetermined temperature range by adjusting the flow rate of the engine coolant flowing through the EGR cooler based on the temperature detected by the temperature detecting means. To do.

これにより、ＥＧＲ装置は、温度検出手段により検出された温度に基づきＥＧＲガスの温度を所定温度範囲に調整でき、ＥＧＲガスの温度をエンジンの燃費悪化を防ぐ温度以下としつつＥＧＲガスの結露を防ぐことができる。
このため、ＥＧＲ装置において、ＥＧＲクーラに低温冷却水が供給されても、ＥＧＲガスの結露を抑制することができる。 Thereby, the EGR device can adjust the temperature of the EGR gas to a predetermined temperature range based on the temperature detected by the temperature detecting means, and prevents the EGR gas from dew condensation while keeping the temperature of the EGR gas below the temperature that prevents the deterioration of fuel consumption of the engine. be able to.
For this reason, in the EGR device, even when the low-temperature cooling water is supplied to the EGR cooler, the condensation of the EGR gas can be suppressed.

本願の第２発明によれば、ＥＧＲ装置は、ＥＧＲクーラに供給されるエンジン冷却水を昇温する昇温手段を備える。
これにより、ＥＧＲクーラに供給される冷却水の温度が上昇しているため、ＥＧＲガスの結露をより確実に抑制できる。 According to the second invention of the present application, the EGR device includes a temperature raising means for raising the temperature of the engine coolant supplied to the EGR cooler.
Thereby, since the temperature of the cooling water supplied to the EGR cooler is rising, dew condensation of EGR gas can be more reliably suppressed.

ＥＧＲ装置を示す構成図である（実施例１）。It is a block diagram which shows an EGR apparatus (Example 1). 温調処理のフロー図である（実施例１）。(Example 1) which is a flowchart of a temperature control process. 燃費および結露水量の実験結果である（実施例１）(Example 1) which is an experimental result of fuel consumption and amount of dew condensation water ＥＧＲ装置を示す構成図である（実施例２）。It is a block diagram which shows an EGR apparatus (Example 2). ＥＧＲ装置を示す構成図である（変形例）。It is a block diagram which shows an EGR apparatus (modification). ＥＧＲ装置を示す構成図である（変形例）。It is a block diagram which shows an EGR apparatus (modification). ＥＧＲ装置を示す構成図である（変形例）。It is a block diagram which shows an EGR apparatus (modification).

以下、発明を実施するための形態を実施例に基づいて説明する。   Hereinafter, modes for carrying out the invention will be described based on examples.

〔実施例１の構成〕
実施例１のＥＧＲ装置１の構成を、図面を用いて説明する。
ＥＧＲ装置１は、いわゆるＬＰＬ型ＥＧＲ装置であって、車両に搭載された過給器２を有するエンジン３の排気流路から吸気流路へＥＧＲガスを戻すものである。そして、ＥＧＲ装置１は、以下に詳説するＥＧＲクーラ４、温度検出手段５および温調手段６を備える。 [Configuration of Example 1]
A configuration of the EGR apparatus 1 according to the first embodiment will be described with reference to the drawings.
The EGR device 1 is a so-called LPL type EGR device that returns EGR gas from an exhaust passage of an engine 3 having a supercharger 2 mounted on a vehicle to an intake passage. And the EGR apparatus 1 is provided with the EGR cooler 4, the temperature detection means 5, and the temperature control means 6 which are explained in full detail below.

ＥＧＲクーラ４は、エンジン冷却水の流れる水路とＥＧＲガスの流れる流路を有するものであり、エンジン冷却水とＥＧＲガスとの間で熱交換を行うことで、ＥＧＲガスの冷却を行っている。
ここで、エンジン冷却水は、エンジン３を冷却するものであり、ポンプ７によりエンジン３とラジエータ８との間を循環しており、エンジン３との間で熱交換を行いエンジン３の熱を吸収し、ラジエータ８との間で熱交換をすることにより熱を放出する。そして、ラジエータ８通過後に温度の下がったエンジン冷却水の一部は、エンジン３供給前に本流から分流してＥＧＲクーラ４に供給される。そして、ＥＧＲクーラ４に供給されたエンジン冷却水の一部は、ＥＧＲガスとの間で熱交換を行った後に、エンジン３冷却後のエンジン冷却水に合流しラジエータ８において放熱する。 The EGR cooler 4 has a channel through which engine cooling water flows and a channel through which EGR gas flows. The EGR cooler 4 cools EGR gas by exchanging heat between the engine cooling water and the EGR gas.
Here, the engine cooling water cools the engine 3, and is circulated between the engine 3 and the radiator 8 by the pump 7, and exchanges heat with the engine 3 to absorb the heat of the engine 3. Then, heat is released by exchanging heat with the radiator 8. A part of the engine cooling water whose temperature has decreased after passing through the radiator 8 is diverted from the main flow before being supplied to the engine 3 and supplied to the EGR cooler 4. A part of the engine cooling water supplied to the EGR cooler 4 exchanges heat with the EGR gas, and then merges with the engine cooling water after cooling the engine 3 to dissipate heat in the radiator 8.

ここで、エンジン冷却水の温度は、高負荷時におけるエンジン３の燃費向上およびノッキング防止のため、ラジエータ８の冷却効率を向上させることにより通常より温度の低い５０℃〜７０℃の範囲、より好ましくは６０℃〜６５℃の範囲内の所定温度に調整されている。   Here, the temperature of the engine cooling water is more preferably in the range of 50 ° C. to 70 ° C. where the temperature is lower than usual by improving the cooling efficiency of the radiator 8 in order to improve the fuel consumption of the engine 3 and prevent knocking at high loads. Is adjusted to a predetermined temperature within a range of 60 ° C to 65 ° C.

温度検出手段５は、ＥＧＲガスの温度を検出するものであって、ＥＧＲクーラ４のＥＧＲガス流れ方向下流側に設けられている。そして、ＥＧＲクーラ４通過後のＥＧＲガスの温度を検出し、その検出値を温調手段６に送信する。
なお、温度検出手段５は、ＥＧＲガスの流れる配管等の内部に配されたサーミスタ、抵抗温度計、熱電対等の一般的な測温機器である。 The temperature detection means 5 detects the temperature of the EGR gas, and is provided on the downstream side of the EGR cooler 4 in the EGR gas flow direction. Then, the temperature of the EGR gas after passing through the EGR cooler 4 is detected, and the detected value is transmitted to the temperature adjustment means 6.
The temperature detecting means 5 is a general temperature measuring device such as a thermistor, a resistance thermometer, a thermocouple, etc., arranged inside a pipe or the like through which EGR gas flows.

温調手段６は、制御処理や演算処理を行うＣＰＵ、制御プログラムや各種データを保存する記憶装置（ＲＯＭやＲＡＭ等のメモリ）等の機能を有する周知のマイクロコンピュータを含んでいる。
また、温調手段６は、ＥＧＲクーラ４を流れるエンジン冷却水の流量を調整する調整手段１０を有している。そして、温度検出手段５により検出されたＥＧＲガスの温度に基づき調整手段１０を操作し、ＥＧＲクーラ４通過後のＥＧＲガスの温度を所定の温度範囲に調整する。 The temperature control means 6 includes a well-known microcomputer having functions such as a CPU that performs control processing and arithmetic processing, and a storage device (memory such as ROM and RAM) that stores control programs and various data.
Further, the temperature adjusting means 6 has an adjusting means 10 for adjusting the flow rate of engine cooling water flowing through the EGR cooler 4. Then, the adjusting means 10 is operated based on the temperature of the EGR gas detected by the temperature detecting means 5 to adjust the temperature of the EGR gas after passing through the EGR cooler 4 to a predetermined temperature range.

なお、調整手段１０は、開度を調整できる一般的な流量調整バルブ１１であり、ＥＧＲクーラ４のエンジン冷却水の流れ方向下流側に設けられている。そして、温調手段６の指令に応じて開度が調整され、ＥＧＲクーラ４を流れるエンジン冷却水の流量を調整する。   The adjusting means 10 is a general flow rate adjusting valve 11 that can adjust the opening degree, and is provided downstream of the EGR cooler 4 in the flow direction of the engine cooling water. Then, the opening degree is adjusted according to the command of the temperature control means 6, and the flow rate of the engine coolant flowing through the EGR cooler 4 is adjusted.

ここで、温調手段６による温調処理の具体例を示す。
温調処理は、図２に示すフロー図に従う。
温調処理は先ず、排気ガスの温度の推定を行う（Ｓ１１０）。排気ガスの温度の推定は、エンジン３の動作状態（エンジン回転数、吸入空気量およびＥＧＲ率）から行う。ここで吸入空気量は、例えば、エアフローメータ等の空気量センサ１２を用いて計測され、ＥＧＲ率は、前述の空気量センサ１２の計測値およびＥＧＲバルブ１３の開度から温調手段６により算出される。そして、温調手段６は、予め冷却効率が判明しているＥＧＲクーラ４に流すエンジン冷却水の流量を、ＥＧＲクーラ４通過後のＥＧＲガスの温度が所定温度、例えば１００℃、となるように算出する（Ｓ１２０）。 Here, a specific example of the temperature adjustment processing by the temperature adjustment means 6 will be shown.
The temperature adjustment process follows the flowchart shown in FIG.
In the temperature adjustment process, first, the temperature of the exhaust gas is estimated (S110). The temperature of the exhaust gas is estimated from the operating state of the engine 3 (engine speed, intake air amount, and EGR rate). Here, the intake air amount is measured using an air amount sensor 12 such as an air flow meter, and the EGR rate is calculated by the temperature adjustment means 6 from the measured value of the air amount sensor 12 and the opening degree of the EGR valve 13. Is done. Then, the temperature control means 6 sets the flow rate of the engine cooling water to flow to the EGR cooler 4 whose cooling efficiency is known in advance so that the temperature of the EGR gas after passing through the EGR cooler 4 becomes a predetermined temperature, for example, 100 ° C. Calculate (S120).

温調手段６は、Ｓ１２０で算出されたエンジン冷却水の流量を実現するように流量調整バルブ１１を操作して、ＥＧＲクーラ４を流れるエンジン冷却水の流量を調整する（Ｓ１３０）。
そして、ＥＧＲクーラ４通過後のＥＧＲガスの温度を温度検出手段５により計測する（Ｓ１４０）。 The temperature adjusting means 6 operates the flow rate adjustment valve 11 so as to realize the flow rate of the engine coolant calculated in S120, and adjusts the flow rate of the engine coolant flowing through the EGR cooler 4 (S130).
Then, the temperature of the EGR gas after passing through the EGR cooler 4 is measured by the temperature detecting means 5 (S140).

そして、ＥＧＲガスの温度と所定温度の比較が行われ（Ｓ１５０）、ＥＧＲガスの温度が１００℃より低かった場合、温調手段６はＥＧＲクーラ４に流すエンジン冷却水の流量を減少させるように流量調整バルブ１１を操作して（Ｓ１６０）、再びＳ１１０へと戻り、温調処理が繰り返される。
一方、ＥＧＲガスの温度が１００℃より高かった場合、温調手段６はＥＧＲクーラ４に流すエンジン冷却水の流量を増加させるように流量調整バルブ１１を操作して（Ｓ１７０）、再びＳ１１０へと戻り、温調処理が繰り返される。 Then, the temperature of the EGR gas is compared with a predetermined temperature (S150), and when the temperature of the EGR gas is lower than 100 ° C., the temperature adjusting means 6 decreases the flow rate of the engine cooling water flowing to the EGR cooler 4. The flow rate adjusting valve 11 is operated (S160), the process returns to S110 again, and the temperature adjustment process is repeated.
On the other hand, when the temperature of the EGR gas is higher than 100 ° C., the temperature adjusting means 6 operates the flow rate adjusting valve 11 so as to increase the flow rate of the engine cooling water flowing to the EGR cooler 4 (S170), and the process returns to S110 again. Returning, the temperature adjustment process is repeated.

〔実施例１の効果〕
実施例１のＥＧＲ装置１は、エンジン冷却水とＥＧＲガスとの間で熱交換を行うＥＧＲクーラ４と、ＥＧＲクーラ４通過後のＥＧＲガスの温度を検出する温度検出手段５と、温調手段６とを備える。
ここで、温調手段６は、温度検出手段５により検出された温度に基づき、ＥＧＲクーラ４を流れるエンジン冷却水の流量を調整することにより、図３に示すように、ＥＧＲクーラ４通過後のＥＧＲガスの温度を所定の温度範囲、例えば９０℃〜１１０℃に調整する。 [Effect of Example 1]
The EGR device 1 according to the first embodiment includes an EGR cooler 4 that exchanges heat between engine coolant and EGR gas, a temperature detection unit 5 that detects the temperature of the EGR gas after passing through the EGR cooler 4, and a temperature adjustment unit. 6.
Here, the temperature adjustment means 6 adjusts the flow rate of the engine cooling water flowing through the EGR cooler 4 based on the temperature detected by the temperature detection means 5, as shown in FIG. 3, after passing through the EGR cooler 4. The temperature of the EGR gas is adjusted to a predetermined temperature range, for example, 90 ° C to 110 ° C.

これにより、ＥＧＲ装置１は、温度検出手段５により検出された温度に基づきＥＧＲガスの温度を所定温度範囲に調整でき、ＥＧＲガスの温度をエンジン３の燃費悪化を防ぐ温度以下（図３（ａ）参照。）としつつＥＧＲガスの結露を防ぐことができる（図３（ｂ）参照。）。
このため、ＥＧＲ装置１において、ＥＧＲクーラ４に低温冷却水が供給されても、ＥＧＲガスの結露を抑制することができる。 As a result, the EGR device 1 can adjust the temperature of the EGR gas to a predetermined temperature range based on the temperature detected by the temperature detection means 5, and the temperature of the EGR gas is equal to or lower than the temperature that prevents the fuel consumption of the engine 3 from deteriorating (FIG. 3 (a ), And the dew condensation of the EGR gas can be prevented (see FIG. 3B).
For this reason, in the EGR device 1, even when the low-temperature cooling water is supplied to the EGR cooler 4, the condensation of the EGR gas can be suppressed.

〔実施例２〕
実施例２のＥＧＲ装置１によれば、図４に示すように、実施例１と異なりエンジン冷却水の一部は、エンジン３冷却後に本流から分流してＥＧＲクーラ４に供給され、ＥＧＲガスとの間で熱交換を行った後に、エンジン３冷却後のエンジン冷却水の本流に合流し、ラジエータ８に向かう。
なお、流量調整バルブ１１がエンジン冷却水の分流位置と合流位置との間に配されているが、この位置に配されていても、温調手段６の指令に応じて開度が調整され、ＥＧＲクーラ４を流れるエンジン冷却水の流量を調整する機能に差はない。 [Example 2]
According to the EGR device 1 of the second embodiment, as shown in FIG. 4, unlike the first embodiment, a part of the engine cooling water is diverted from the main flow after being cooled by the engine 3 and supplied to the EGR cooler 4. After exchanging heat between the two, the main flow of engine cooling water after cooling of the engine 3 is merged and headed to the radiator 8.
The flow rate adjusting valve 11 is arranged between the branching position and the merge position of the engine cooling water, but the opening degree is adjusted according to the command of the temperature adjusting means 6 even if it is arranged at this position. There is no difference in the function of adjusting the flow rate of the engine coolant flowing through the EGR cooler 4.

このため、ＥＧＲクーラ４に供給されるエンジン冷却水は、ＥＧＲクーラ４供給前にエンジン３との間で熱交換が行われ、温度が上昇している。すなわち、エンジン３が昇温手段１４となっている。
これにより、ＥＧＲクーラ４に供給される冷却水の温度が上昇しているため、ＥＧＲガスの結露をより確実に抑制できる。 For this reason, the engine coolant supplied to the EGR cooler 4 undergoes heat exchange with the engine 3 before the EGR cooler 4 is supplied, and the temperature rises. That is, the engine 3 serves as the temperature raising means 14.
Thereby, since the temperature of the cooling water supplied to the EGR cooler 4 is rising, the dew condensation of EGR gas can be suppressed more reliably.

［変形例］
本発明は、その要旨を逸脱しない範囲で様々な変形例を考えることができる。
例えば、実施例1、２によれば、調整手段１０として流量調整バルブ１１を用いたが、この態様に拘るものではなく、例えば、図５に示すような温調手段６の指令に応じて出力が調整され、ＥＧＲクーラ４を流れるエンジン冷却水の流量を調整するポンプ１５を調整手段１０としてもよい。さらに、流量調整バルブ１１とポンプ１５とを併用し、これらの双方、またはいずれか一方、例えば図６に示すように流量調整バルブ１１を調整手段１０としてもよい。 [Modification]
Various modifications can be considered for the present invention without departing from the gist thereof.
For example, according to the first and second embodiments, the flow rate adjusting valve 11 is used as the adjusting unit 10, but the present invention is not limited to this mode. For example, the output is performed according to the command of the temperature adjusting unit 6 as shown in FIG. The adjusting means 10 may be a pump 15 that adjusts the flow rate of engine coolant flowing through the EGR cooler 4. Furthermore, the flow rate adjusting valve 11 and the pump 15 may be used in combination, and both or one of them, for example, the flow rate adjusting valve 11 may be used as the adjusting means 10 as shown in FIG.

また、実施例２によれば、昇温手段１４はエンジン３であったが、図７に示すように過給機２を昇温手段１４としてもよい。
なお、エンジン３等を昇温手段１４とする場合、別途に、昇温手段１４を用意する必要がないため、設置スペース、設置コストにおいて有利である。 Further, according to the second embodiment, the temperature raising means 14 is the engine 3, but the supercharger 2 may be the temperature raising means 14 as shown in FIG.
In addition, when the engine 3 etc. are used as the temperature raising means 14, since it is not necessary to prepare the temperature raising means 14 separately, it is advantageous in installation space and installation cost.

１ ＥＧＲ装置 ４ ＥＧＲクーラ ５ 温度検出手段 ６ 温調手段

DESCRIPTION OF SYMBOLS 1 EGR apparatus 4 EGR cooler 5 Temperature detection means 6 Temperature control means

Claims (2)

エンジン冷却水とＥＧＲガスとの間で熱交換を行うＥＧＲクーラ（４）と、
このＥＧＲクーラ（４）通過後のＥＧＲガスの温度を検出する温度検出手段（５）と、
この温度検出手段（５）により検出された温度に基づき、前記ＥＧＲクーラ（４）を流れる前記エンジン冷却水の流量を調整することにより、前記ＥＧＲクーラ（４）通過後のＥＧＲガスの温度を所定の温度範囲に調整する温調手段（６）とを備えるＥＧＲ装置（１）。 An EGR cooler (4) for exchanging heat between engine coolant and EGR gas;
Temperature detecting means (5) for detecting the temperature of the EGR gas after passing through the EGR cooler (4);
Based on the temperature detected by the temperature detection means (5), the temperature of the EGR gas after passing through the EGR cooler (4) is determined by adjusting the flow rate of the engine cooling water flowing through the EGR cooler (4). EGR apparatus (1) provided with the temperature control means (6) adjusted to the temperature range of this. 請求項１に記載したＥＧＲ装置（１）において、
前記ＥＧＲクーラ（４）に供給される前記エンジン冷却水を、前記ＥＧＲクーラ（４）に供給する前に昇温する昇温手段（１４）を備えること特徴とするＥＧＲ装置（１）。

In the EGR device (1) according to claim 1,
An EGR device (1) comprising a temperature raising means (14) for raising the temperature of the engine coolant supplied to the EGR cooler (4) before being supplied to the EGR cooler (4).

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JPH0634160U (en) * 1992-10-06 1994-05-06 日産ディーゼル工業株式会社 EGR device of engine
JPH11351073A (en) * 1998-06-05 1999-12-21 Nissan Diesel Motor Co Ltd Egr cooler
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