JP2009270454A - Egr control device of 4-cycle gas engine - Google Patents

Egr control device of 4-cycle gas engine Download PDF

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JP2009270454A
JP2009270454A JP2008120075A JP2008120075A JP2009270454A JP 2009270454 A JP2009270454 A JP 2009270454A JP 2008120075 A JP2008120075 A JP 2008120075A JP 2008120075 A JP2008120075 A JP 2008120075A JP 2009270454 A JP2009270454 A JP 2009270454A
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egr
gas
speed
egr valve
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JP4831838B2 (en
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Satoru Yamada
哲 山田
Daiki Tanaka
大樹 田中
Yoshitaka Shibata
善隆 柴田
Ayumi Ogura
歩 小椋
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Mitsubishi Heavy Industries Ltd
Osaka Gas Co Ltd
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Osaka Gas Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an EGR control device of a 4-cycle gas engine for improving startability of an engine, by avoiding the occurrence of large rotating speed reduction when setting an engine rotating speed, in the 4-cycle gas engine having the EGR control device. <P>SOLUTION: This 4-cycle gas engine has an EGR gas passage for recirculating a part of exhaust gas from an exhaust passage of the engine to an intake port as EGR gas, and an EGR valve for controlling the passage area of the EGR gas passage, and has a rotating speed detector for detecting the rotating speed of the engine, and an EGR valve control device for inputting a detection value of the engine rotating speed from the rotating speed detector, and is characterized in that the EGR valve control device restrains reduction in the engine rotating speed by reducing a valve opening speed in the EGR valve, when a reduction quantity of the engine rotating speed exceeds a specific value in a valve opening period of the EGR valve. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、エンジンの排気通路からの排気ガスの一部をＥＧＲガスとして吸気ポートに還流するＥＧＲガス通路と、該ＥＧＲガス通路の通路面積を制御するＥＧＲ弁とを備えた４サイクルガスエンジンに関する。   The present invention relates to a four-cycle gas engine including an EGR gas passage that recirculates a part of exhaust gas from an exhaust passage of the engine to an intake port as EGR gas, and an EGR valve that controls a passage area of the EGR gas passage. .

ガスエンジンは、一般に燃料ガスと空気とを予混合して燃焼室に送り込み、着火装置により発生した着火火炎によって着火燃焼せしめるようにして、希薄混合気燃焼を行っているため、エンジンの始動時には予混合された混合気をスロットル弁によって適正流量になるように制御している。
即ち、図１はかかる４サイクルガスエンジンの作動説明図であり、図１によりガスエンジンの要部について説明すると、符号１００で示されるエンジン（ガスエンジン）は４サイクルガスエンジンであり、シリンダ１０２ａ内に往復摺動自在に嵌合されたピストン１０２、該ピストン１０２の往復動を回転に変換するクランク軸１１２、前記ピストン１０２の上面とシリンダ１０２ａの内面との間に区画形成される燃焼室１０１、該燃焼室１０１に接続される吸気ポート１０３、該吸気ポート１０３を開閉する吸気弁１０４、該燃焼室１０１に接続される排気ポート１０５、該排気ポート１０５を開閉する排気弁１０６等によって構成される。 In general, a gas engine premixes fuel gas and air, sends them to a combustion chamber, and ignites and burns them with an ignition flame generated by an ignition device. The mixed air-fuel mixture is controlled by a throttle valve so as to have an appropriate flow rate.
That is, FIG. 1 is an operation explanatory view of such a 4-cycle gas engine. The main part of the gas engine will be described with reference to FIG. 1. The engine (gas engine) denoted by reference numeral 100 is a 4-cycle gas engine, A piston 102 slidably fitted to the piston 102, a crankshaft 112 for converting the reciprocating motion of the piston 102 into rotation, a combustion chamber 101 defined between the upper surface of the piston 102 and the inner surface of the cylinder 102a, An intake port 103 connected to the combustion chamber 101, an intake valve 104 for opening and closing the intake port 103, an exhaust port 105 connected to the combustion chamber 101, an exhaust valve 106 for opening and closing the exhaust port 105, etc. .

前記吸気ポート１０３の途中にはガスミキサー１１０及びスロットル弁１１５が設置され、燃料ガス管１１１からガス量調整弁１０９を通して供給された燃料ガスと空気とを該ガスミキサー１１０で予混合する。
そして、この予混合気は前記スロットル弁１１５の開度制御によって流量を調整されて、前記吸気弁１０４の開弁によって前記燃焼室１０１に供給される。
符号１０７で示される着火装置は、この例では燃焼室１０１内の予混合気に火花点火を行う点火プラグで構成されている。
そして、かかるガスエンジンは、ＥＧＲ制御装置を備えており、排気ポート１０５からの排気ガスの一部をＥＧＲガスとして吸気ポート１０３に還流するＥＧＲ管７と、該ＥＧＲ管７の通路面積を制御するＥＧＲ弁１とを備え、ＥＧＲ弁１の開度制御によりエンジンの運転制御を行っている。 A gas mixer 110 and a throttle valve 115 are installed in the intake port 103, and fuel gas and air supplied from the fuel gas pipe 111 through the gas amount adjusting valve 109 are premixed by the gas mixer 110.
The flow rate of the premixed gas is adjusted by controlling the opening degree of the throttle valve 115, and the premixed gas is supplied to the combustion chamber 101 by opening the intake valve 104.
In this example, the ignition device denoted by reference numeral 107 is composed of an ignition plug that performs spark ignition on the premixed gas in the combustion chamber 101.
The gas engine includes an EGR control device, and controls an EGR pipe 7 that recirculates a part of the exhaust gas from the exhaust port 105 to the intake port 103 as EGR gas, and a passage area of the EGR pipe 7. EGR valve 1 is provided, and engine operation control is performed by opening degree control of EGR valve 1.

尚、排気ポートからの排気ガスの一部をＥＧＲガスとして吸気ポートに還流するＥＧＲ管と、該ＥＧＲ管の通路面積を制御するＥＧＲ弁とを備え、ＥＧＲ弁の開度制御によりエンジンの運転制御を行うＥＧＲ制御装置を備えたエンジンが、特許文献１（特開平８−１００６８９号公報）にて示されている。   An EGR pipe that recirculates a part of the exhaust gas from the exhaust port to the intake port as EGR gas, and an EGR valve that controls the passage area of the EGR pipe, and controls the operation of the engine by controlling the opening of the EGR valve. An engine equipped with an EGR control device for performing the above is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 8-1000068).

特開平８−１００６８９号公報Japanese Patent Laid-Open No. 8-100689

しかしながら、前記従来技術には次のような解決すべき問題点がある。
即ち、前記４サイクルガスエンジンは、燃料ガスと空気とを予混合して燃焼室に送り込み、着火装置により発生した着火火炎によって、着火燃焼せしめるようにして希薄混合気燃焼を行っているため、始動時におけるエンジン回転数の変動が大きくなる傾向にある。 However, the prior art has the following problems to be solved.
That is, the 4-cycle gas engine performs lean mixture combustion by premixing fuel gas and air, sending them to the combustion chamber, and igniting and burning by the ignition flame generated by the ignition device. There is a tendency that the fluctuation of the engine speed at the time increases.

図５は図１に示されるようなＥＧＲ制御装置を備えた４サイクルガスエンジンの、エンジン始動後におけるエンジン回転数の変化を示す。図５に示すように、エンジン始動後に、エンジン回転数が上昇するが、始動時にはエンジンが温まっていないこと等によって、エンジン回転数が目標値に整定しにくい（回転数変動ΔＮ）。
これに伴い、かかる従来技術においては、エンジン始動後のエンジン回転数の整定時に、排ガス浄化手段としてのＥＧＲ（排ガス再循環）ガスが投入されると、エンジン回転数が整定せずに、目標回転数から大幅に回転数の低下ΔＮ１が発生しやすい。
このため、エンジンの始動性が低下し、始動時の回転数の変動、始動時燃費の悪化等の不具合を引き起こす。 FIG. 5 shows changes in the engine speed after starting the engine of a four-cycle gas engine equipped with an EGR control device as shown in FIG. As shown in FIG. 5, the engine speed increases after the engine is started, but the engine speed is difficult to settle to the target value because the engine is not warmed at the time of start (rotational speed fluctuation ΔN).
Along with this, in such conventional technology, when EGR (exhaust gas recirculation) gas as exhaust gas purification means is introduced at the time of setting the engine speed after the engine is started, the engine speed is not set but the target speed is set. The number of revolutions ΔN 1 is likely to be greatly reduced from the number.
For this reason, the startability of the engine is lowered, and problems such as fluctuations in the number of revolutions at start-up and deterioration in fuel efficiency at start-up are caused.

本発明はかかる従来技術の課題に鑑み、ＥＧＲ制御装置を備えた４サイクルガスエンジンにおいて、エンジン回転数の整定時における大幅な回転数の低下の発生を回避して、エンジンの始動性を向上する４サイクルガスエンジンのＥＧＲ制御装置を提供することを目的とする。   In view of the problems of the prior art, the present invention avoids the occurrence of a significant decrease in the engine speed when the engine speed is set, and improves the engine startability in a four-cycle gas engine equipped with an EGR control device. An object of the present invention is to provide an EGR control device for a four-cycle gas engine.

本発明はかかる目的を達成するもので、エンジンの排気通路からの排気ガスの一部をＥＧＲガスとして吸気ポートに還流するＥＧＲガス通路と、該ＥＧＲガス通路の通路面積を制御するＥＧＲ弁とを備えた４サイクルガスエンジンにおいて、前記エンジンの回転数を検出する回転数検出器と、前記回転数検出器からのエンジン回転数の検出値が入力されるＥＧＲ弁制御装置とを備え、該ＥＧＲ弁制御装置は、前記ＥＧＲ弁の開弁期間中であって前記エンジン回転数の低下量が一定値を超えたとき前記ＥＧＲ弁の開弁速度を低下させてエンジン回転数の低下を抑制することを特徴とする（請求項１）。
また、かかる発明において、好ましくは、前記ＥＧＲ弁制御装置は、前記ＥＧＲ弁の開弁期間中であって前記エンジン回転数の低下量が前記一定値以内にあるときは、前記ＥＧＲ弁の開弁速度を一定速度以上に保持してエンジン回転数を一定速度に維持する（請求項２）。 The present invention achieves such an object, and includes an EGR gas passage that recirculates a part of the exhaust gas from the exhaust passage of the engine to the intake port as EGR gas, and an EGR valve that controls the passage area of the EGR gas passage. The four-cycle gas engine includes: a rotation speed detector that detects the rotation speed of the engine; and an EGR valve control device that receives a detection value of the engine rotation speed from the rotation speed detector. The control device suppresses the decrease in the engine speed by decreasing the opening speed of the EGR valve when the decrease amount of the engine speed exceeds a certain value during the opening period of the EGR valve. It is characterized (claim 1).
In this invention, it is preferable that the EGR valve control device opens the EGR valve when the amount of decrease in the engine speed is within the predetermined value during the opening period of the EGR valve. The engine speed is maintained at a constant speed while maintaining the speed at a constant speed or higher (Claim 2).

また、本発明は、前記ガスエンジンの暖機状態を検出するエンジン暖機状態検出部を備え、該エンジン暖機状態検出部で暖機中を検出したとき、前記ＥＧＲ弁の開弁速度を低下させてエンジン回転数の低下を抑制することを特徴とする（請求項３）。また、好ましくは、前記暖機状態検出部が前記ＥＧＲガスのガス温度検出部であるとよい（請求項４）。   Further, the present invention includes an engine warm-up state detection unit that detects a warm-up state of the gas engine, and when the engine warm-up state detection unit detects that the engine is warming up, the valve opening speed of the EGR valve is reduced. Thus, a reduction in engine speed is suppressed (claim 3). Preferably, the warm-up state detection unit is a gas temperature detection unit of the EGR gas.

回転数検出器からのエンジン回転数の検出値が入力されるＥＧＲ弁制御装置を備え、該ＥＧＲ弁制御装置は、ＥＧＲ弁の開弁期間中であって、エンジン回転数の低下量が一定値を超えたときＥＧＲ弁の開弁速度を低下させてエンジン回転数の低下を抑制するともに、
また、ＥＧＲ弁制御装置は、前記ＥＧＲ弁の開弁期間中であってエンジン回転数の低下量が前記一定値以内にあるときは、ＥＧＲ弁の開弁速度を一定速度以上に保持してエンジン回転数を一定速度に維持するので（請求項１，２）、
エンジン回転数の減速回転数設定部に、時間とＥＧＲ弁開度の関係を複数通り設定しておき（図３のように）、エンジン回転数の低下量を検出してエンジン回転数の低下量が大きいときは、ＥＧＲ弁開度をゆっくり開き（図３のＣ線のように）、エンジン回転数の低下量が小さいときはＥＧＲ弁の開放速度を速めて（図３のＡ線のように）開く。 An EGR valve control device to which a detection value of the engine speed from the rotation speed detector is input is provided, and the EGR valve control device is in a period during which the EGR valve is open, and the decrease amount of the engine speed is a constant value. When the pressure exceeds the limit, the opening speed of the EGR valve is reduced to suppress the reduction in engine speed,
Further, the EGR valve control device maintains the valve opening speed of the EGR valve at a predetermined speed or higher when the decrease in the engine speed is within the predetermined value during the valve opening period of the EGR valve. Since the rotation speed is maintained at a constant speed (Claims 1 and 2),
A plurality of relationships between the time and the EGR valve opening are set in the engine speed reduction speed setting section (as shown in FIG. 3), and the engine speed decrease amount is detected by detecting the engine speed decrease amount. Is large, the EGR valve opening is slowly opened (as indicated by line C in FIG. 3), and when the amount of decrease in the engine speed is small, the opening speed of the EGR valve is increased (as indicated by line A in FIG. 3). )open.

従って、かかる発明によれば、エンジン回転数の低下量が大きいときは、ＥＧＲ弁開度をゆっくり開くことによって、ＥＧＲ弁を通って吸気ポートに還流するＥＧＲガスの流量の増加が緩慢になって、新気のガス量が相対的に多くなることにより、エンジンの回転数の上昇が早くなる。
一方、エンジン回転数の低下量が小さいときは、ＥＧＲ弁の開弁速度を速めることによって、ＥＧＲ弁を通って吸気ポートに還流するＥＧＲガスの流量の増加し、相対的に新気のガス量が少なくなることにより、エンジンの回転数の上昇が緩慢になる。 Therefore, according to this invention, when the amount of decrease in the engine speed is large, the increase in the flow rate of the EGR gas flowing back to the intake port through the EGR valve is slowed by slowly opening the EGR valve opening. As the amount of fresh gas is relatively increased, the engine speed increases rapidly.
On the other hand, when the decrease amount of the engine speed is small, the flow rate of the EGR gas returning to the intake port through the EGR valve is increased by increasing the opening speed of the EGR valve, and the amount of fresh air is relatively increased. As the engine speed decreases, the engine speed increases slowly.

これにより、エンジン回転数の検出値によってＥＧＲ弁の開度を適正に保持するので、ＥＧＲ弁の開度によってＮＯｘ低減を行うとともに、エンジン回転数の大幅な低下を回避して、エンジン始動後のエンジン回転数の調整時にエンジン回転数が整定し、エンジンの始動性が向上し、始動時の回転数の変動、始動時燃費の悪化等の不具合を確実に回避できる。   As a result, the opening degree of the EGR valve is appropriately maintained based on the detected value of the engine speed, so that NOx is reduced by the opening degree of the EGR valve, and a significant decrease in the engine speed is avoided, so that When the engine speed is adjusted, the engine speed is stabilized, the engine startability is improved, and problems such as fluctuations in the speed at start-up and deterioration in fuel efficiency at start-up can be reliably avoided.

また、本発明は、ＥＧＲガスの温度を検出してＥＧＲ弁制御装置に入力するＥＧＲ温度センサを設け、ＥＧＲ弁制御装置は、ＥＧＲガスの温度が予め設定された一定値よりも低いとき、ＥＧＲ弁の開弁速度を低下させるので（請求項３）、
エンジンが温まってなくＥＧＲガスの温度が予め設定された一定値よりも低いときに、前記のようにエンジン回転数によってＥＧＲ弁の開弁速度を低下させる制御を行うことより、エンジン回転数の大幅な低下を回避する一方、エンジンが温まってＥＧＲガスの温度が予め設定温度以上の場合は、通常のＥＧＲ弁の開閉によって、正常なＮＯｘ低減を行うことができる。 Further, the present invention provides an EGR temperature sensor that detects the temperature of the EGR gas and inputs the detected temperature to the EGR valve control device, and the EGR valve control device detects the EGR gas temperature when the temperature of the EGR gas is lower than a predetermined value. Since the valve opening speed is reduced (Claim 3),
When the engine is not warmed and the temperature of the EGR gas is lower than a predetermined value, the control for reducing the opening speed of the EGR valve according to the engine speed as described above is performed, so that the engine speed can be greatly increased. On the other hand, when the engine is warmed and the temperature of the EGR gas is equal to or higher than the preset temperature, normal NOx reduction can be performed by opening and closing the normal EGR valve.

以下、本発明を図に示した実施例を用いて詳細に説明する。但し、この実施形態に記載されている構成部品の寸法、材質、形状、その相対配置などは特に特定的な記載がない限り、この発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。   Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

図１は、本発明の第１実施形態に係る４サイクルガスエンジンの全体構成図である。
図１において、符号１００で示されるエンジン（ガスエンジン）は４サイクルガスエンジンであり、シリンダ１０２ａ内に往復摺動自在に嵌合されたピストン１０２、該ピストン１０２の往復動を回転に変換するクランク軸１１２、前記ピストン１０２の上面とシリンダ１０２ａの内面との間に区画形成される燃焼室１０１、該燃焼室１０１に接続される吸気ポート１０３、該吸気ポート１０３を開閉する吸気弁１０４、該燃焼室１０１に接続される排気ポート１０５、該排気ポート１０５を開閉する排気弁１０６等によって構成される。 FIG. 1 is an overall configuration diagram of a four-cycle gas engine according to a first embodiment of the present invention.
In FIG. 1, an engine (gas engine) denoted by reference numeral 100 is a four-cycle gas engine, and a piston 102 that is slidably fitted in a cylinder 102a and a crank that converts the reciprocating motion of the piston 102 into rotation. A shaft 112, a combustion chamber 101 defined between the upper surface of the piston 102 and the inner surface of the cylinder 102a, an intake port 103 connected to the combustion chamber 101, an intake valve 104 for opening and closing the intake port 103, and the combustion An exhaust port 105 connected to the chamber 101, an exhaust valve 106 that opens and closes the exhaust port 105, and the like.

前記吸気ポート１０３の途中にはガスミキサー１１０及びスロットル弁１１５が設置され、燃料ガス管１１１からガス量調整弁１０９を通して供給された燃料ガスと空気とを該ガスミキサー１１０で予混合する。
そして、この予混合気は前記スロットル弁１１５の開度制御によって流量を調整されて、前記吸気弁１０４の開弁によって前記燃焼室１０１に供給される。
符号１０７で示される着火装置は、この例では燃焼室１０１内の予混合気に火花点火を行う点火プラグで構成されている。
そして、かかるガスエンジンは、ＥＧＲ制御装置を備えており、排気ポート１０５からの排気ガスの一部をＥＧＲガスとして吸気ポート１０３に還流するＥＧＲ管７と、該ＥＧＲ管７の通路面積を制御するＥＧＲ弁１とを備え、ＥＧＲ弁１の開度制御によりエンジンの運転制御を行っている。 A gas mixer 110 and a throttle valve 115 are installed in the intake port 103, and fuel gas and air supplied from the fuel gas pipe 111 through the gas amount adjusting valve 109 are premixed by the gas mixer 110.
The flow rate of the premixed gas is adjusted by controlling the opening degree of the throttle valve 115, and the premixed gas is supplied to the combustion chamber 101 by opening the intake valve 104.
In this example, the ignition device denoted by reference numeral 107 is composed of an ignition plug that performs spark ignition on the premixed gas in the combustion chamber 101.
The gas engine includes an EGR control device, and controls an EGR pipe 7 that recirculates a part of the exhaust gas from the exhaust port 105 to the intake port 103 as EGR gas, and a passage area of the EGR pipe 7. EGR valve 1 is provided, and engine operation control is performed by opening degree control of EGR valve 1.

４は排気ポート１０５からの排気ガスと水とを熱交換する排ガス熱交換器である。６は前記排ガス熱交換器４にて発生した湯または蒸気により、湯を発生する給湯器である。８は前記排ガス熱交換器４と通過した後の排気ガスが通過する排気通路である。   Reference numeral 4 denotes an exhaust gas heat exchanger for exchanging heat between the exhaust gas from the exhaust port 105 and water. A water heater 6 generates hot water using hot water or steam generated in the exhaust gas heat exchanger 4. Reference numeral 8 denotes an exhaust passage through which the exhaust gas after passing through the exhaust gas heat exchanger 4 passes.

以上の構成は、公知の給湯器を備えたガスエンジンと同様である。本発明はかかる４サイクルガスエンジンのＥＧＲ制御装置に関するものである。   The above structure is the same as that of the gas engine provided with the well-known water heater. The present invention relates to an EGR control device for such a four-cycle gas engine.

エンジン１００の回転数を検出する回転数検出器２、及びＥＧＲガスの温度を検出するＥＧＲ温度センサ３（エンジン暖機状態検出部）を備え、前記回転数検出器２からのエンジンの回転数の検出値、及びＥＧＲ温度センサ３からのＥＧＲガスの温度の検出値は、ＥＧＲ弁制御装置５に入力される。
エンジンの暖機状態を検出するエンジン暖機状態検出部としてＥＧＲ温度センサ３を説明したが、排ガスの温度を検出する排ガス温度センサ、または、エンジン冷却水の温度を検出する冷却水温度センサ、または、エンジンオイルの温度を検出するエンジンオイル温度センサを設置しても良いことは勿論である。 A rotation speed detector 2 for detecting the rotation speed of the engine 100 and an EGR temperature sensor 3 (engine warm-up state detection unit) for detecting the temperature of EGR gas are provided, and the rotation speed of the engine from the rotation speed detector 2 is detected. The detected value and the detected value of the temperature of the EGR gas from the EGR temperature sensor 3 are input to the EGR valve control device 5.
Although the EGR temperature sensor 3 has been described as the engine warm-up state detection unit for detecting the warm-up state of the engine, the exhaust gas temperature sensor for detecting the temperature of the exhaust gas, the cooling water temperature sensor for detecting the temperature of the engine cooling water, or Of course, an engine oil temperature sensor for detecting the temperature of the engine oil may be provided.

次に、図２を参照して前記ＥＧＲ弁制御装置５の作用を説明する。図２は前記本発明にかかる４サイクルガスエンジンのＥＧＲ制御装置の制御ブロック図である。
回転数検出器２からのエンジン１００の回転数の検出値は、ＥＧＲ制御装置５のＥＧＲ弁減速回転数設定部５１に入力される。
ＥＧＲ弁減速回転数設定部５１においては、前記ＥＧＲ弁１の開弁期間中であって、前記回転数検出器２からのエンジン回転数の検出値が入力される。
該ＥＧＲ弁減速回転数設定部５１には、図３に示すように、時間とＥＧＲ弁開度の関係を複数通り設定しておく。ｔ０時点でＥＧＲ弁１の開弁が開始し（Ｅ０＝０）、ｔ１時点でＥＧＲ投入後最も回転数が低下し、そのときのＥＧＲ弁１の開度がＥ１である。そしてＥＧＲ弁１はその後Ａ線、Ｂ線、Ｃ線の複数のＥＧＲ弁開放速度のいずれかに沿って最終的に開度Ｅ２に達する。 Next, the operation of the EGR valve control device 5 will be described with reference to FIG. FIG. 2 is a control block diagram of the EGR control device of the four-cycle gas engine according to the present invention.
The detected value of the rotational speed of the engine 100 from the rotational speed detector 2 is input to the EGR valve deceleration rotational speed setting unit 51 of the EGR control device 5.
In the EGR valve deceleration rotational speed setting unit 51, the detected value of the engine rotational speed from the rotational speed detector 2 is input while the EGR valve 1 is open.
In the EGR valve deceleration rotation speed setting unit 51, as shown in FIG. 3, a plurality of relationships between time and the EGR valve opening are set. The opening of the EGR valve 1 starts at time t 0 (E 0 = 0), and the rotational speed decreases most after the EGR is turned on at time t 1 , and the opening of the EGR valve 1 at that time is E 1 . The EGR valve 1 is then A line, B line, eventually reaching the opening E 2 along any of a plurality of EGR valve opening speed of the C-line.

次に、このＥＧＲ弁１の開度制御について説明する。
図５の前記エンジン回転数の低下量（ΔＮ１）が、予め設定された一定値（ΔＥ）を超えるとき（ΔＮ１＞ΔＥ）は、図３のＣ線のように、ＥＧＲ弁開度をゆっくり開く。
また、エンジン回転数の低下量が前記一定値未満（ΔＮ１＜ΔＥ）のときは、図３のＡ線のように、ＥＧＲ弁の開放速度を速める。
また、エンジン回転数の低下量が略前記一定値（ΔＮ１＝ΔＥ）のときは、図３のＢ線のように、ＥＧＲ弁の開放速度は現状の基準開放速度を維持する。 Next, the opening degree control of the EGR valve 1 will be described.
When the reduction amount (ΔN 1 ) of the engine speed in FIG. 5 exceeds a preset constant value (ΔE) (ΔN 1 > ΔE), the EGR valve opening degree is set as shown by the C line in FIG. Open slowly.
Further, when the amount of decrease in the engine speed is less than the predetermined value (ΔN 1 <ΔE), the opening speed of the EGR valve is increased as shown by line A in FIG.
Further, when the amount of decrease in the engine speed is substantially the constant value (ΔN 1 = ΔE), the opening speed of the EGR valve maintains the current reference opening speed as shown by line B in FIG.

なお、エンジン回転数の低下量（ΔＮ１）は、ＥＧＲ弁の開弁開始時ｔ０時点における回転数と、ＥＧＲ弁を一定開放速度で開弁して最もエンジン回転数が低下したｔ１時点の回転数との差をいう。
また、閾値である一定値（ΔＥ）は、エンジン１００の始動安定性を考慮して適宜設定される。
前記ＥＧＲ弁減速回転数設定部５１の出力は、ＥＧＲ弁減速設定部５２に入力される。 It should be noted that the amount of decrease in engine speed (ΔN 1 ) is the number of revolutions at time t 0 when the EGR valve starts to open and the time t 1 when the engine speed has decreased most when the EGR valve is opened at a constant opening speed. The difference from the number of revolutions.
Further, the constant value (ΔE) that is a threshold value is appropriately set in consideration of the starting stability of engine 100.
The output of the EGR valve deceleration speed setting unit 51 is input to the EGR valve deceleration setting unit 52.

次に、ＥＧＲ温度センサ３からのＥＧＲガスの温度の検出値は、ＥＧＲ弁減速温度設定部５３に入力される。
該ＥＧＲ弁減速温度設定部５３においては、エンジン１００が温まってなくＥＧＲガスの温度が予め設定された一定値よりも低いときには、前記のようなエンジン回転数によってＥＧＲ弁の開弁速度を低下させる制御を行うことによりエンジン回転数の大幅な低下を回避する。また、エンジンが温まってＥＧＲガスの温度が予め設定された一定温度以上の場合は、前記エンジン回転数によってＥＧＲ弁の開弁速度を低下させる制御を行うのを廃止して、通常のＥＧＲ弁の開閉による制御を行う。
かかるＥＧＲ弁減速温度設定部５３の出力は、ＥＧＲ弁減速設定部５２に入力される。 Next, the detected value of the temperature of the EGR gas from the EGR temperature sensor 3 is input to the EGR valve deceleration temperature setting unit 53.
In the EGR valve deceleration temperature setting unit 53, when the engine 100 is not warmed and the temperature of the EGR gas is lower than a predetermined value, the valve opening speed of the EGR valve is reduced by the engine speed as described above. By performing the control, a significant decrease in engine speed is avoided. Further, when the engine is warmed and the temperature of the EGR gas is equal to or higher than a predetermined temperature, the control for reducing the opening speed of the EGR valve according to the engine speed is abolished, and the normal EGR valve Control by opening and closing.
The output of the EGR valve deceleration temperature setting unit 53 is input to the EGR valve deceleration setting unit 52.

従って、ＥＧＲ弁減速設定部５２は、前記ＥＧＲ弁１の開弁期間中であって、ＥＧＲ弁減速温度設定部５３からＥＧＲガスの温度が予め設定された一定値よりも低いときに、前記のような、エンジン回転数の低下量（ΔＮ１）が、予め設定された一定値（ΔＥ）を超えるときは、Ｃ線のようにＥＧＲ弁開度をゆっくり開き、エンジン回転数の低下量（ΔＮ１）が前記一定値（ΔＥ）未満のときは、図３のＡ線のように、ＥＧＲ弁の開放速度を速め、エンジン回転数の低下量（ΔＮ１）が前記一定値（ΔＥ）と略同等のときには、図３のＢ線のように、ＥＧＲ弁の開放速度はそれまでの開放速度を維持する制御を行う。
そして、ＥＧＲガスの温度が予め設定された一定値よりも高いとき、つまりエンジンが温まってＥＧＲガスの温度が予め設定温度以上になった場合は、通常のＥＧＲ弁の開閉によって、すなわち、エンジン回転数の低下量に応じたＥＧＲ弁開度制御をすることなく、一定のＥＧＲ弁開度速度によって制御されて、ＮＯｘ低減を行うことができる。
かかる、演算結果により前記ＥＧＲ弁１は開閉される。 Therefore, when the EGR valve deceleration setting unit 52 is in the open period of the EGR valve 1 and the temperature of the EGR gas from the EGR valve deceleration temperature setting unit 53 is lower than a predetermined constant value, When the engine speed reduction amount (ΔN 1 ) exceeds a preset constant value (ΔE), the EGR valve opening is slowly opened as shown by line C, and the engine speed reduction amount (ΔN 1 ) is less than the predetermined value (ΔE), the opening speed of the EGR valve is increased as shown by line A in FIG. 3, and the engine speed reduction amount (ΔN 1 ) is substantially equal to the constant value (ΔE). At the same time, as shown by line B in FIG. 3, the opening speed of the EGR valve is controlled to maintain the previous opening speed.
When the temperature of the EGR gas is higher than a predetermined constant value, that is, when the engine is warmed and the temperature of the EGR gas becomes equal to or higher than the preset temperature, the normal operation of the EGR valve, that is, engine rotation It is possible to perform NOx reduction by being controlled by a constant EGR valve opening speed without performing EGR valve opening control according to the amount of decrease in the number.
The EGR valve 1 is opened and closed according to the calculation result.

次に、ＥＧＲ弁１の開度制御の第２実施形態について説明する。
エンジン回転数の低下量（ΔＮ１）だけでなく、エンジン回転数の低下率（ΔＮ１／Δｔ）も加味した選定をする。
図４に示すように、まず、ステップＳ１０で、エンジン回転数の低下量が一定値（ΔＥ）を超えるか否かを判定して、超えていれば、次にエンジン回転数の低下率（ΔＮ１／Δｔ）の大きさに応じて図３のＡ線、Ｂ線、Ｃ線による制御をし、超えていなければ、すなわち、一定値（ΔＥ）以下であれば、ステップＳ１１に進んで、第１実施形態のようにＥＧＲ弁開度速度をＡ線に沿って開放速度を速める。 Next, a second embodiment of the opening degree control of the EGR valve 1 will be described.
The selection is made in consideration of not only the engine speed reduction amount (ΔN 1 ) but also the engine speed reduction rate (ΔN 1 / Δt).
As shown in FIG. 4, first, in step S10, it is determined whether or not the amount of decrease in engine speed exceeds a certain value (ΔE). 1 / Δt), the control is performed by the A line, B line, and C line in FIG. 3, and if it does not exceed, that is, if it is less than a certain value (ΔE), the process proceeds to step S11. As in the embodiment, the opening speed of the EGR valve opening speed is increased along the A line.

ステップＳ１２でエンジン回転数の低下率（ΔＮ１／Δｔ）が一定の基準値（Ｙ）を超える場合には、ステップＳ１３のように図３のＣ線のように、ＥＧＲ弁の開度をゆっくり開く。
ステップＳ１６で、エンジン回転数の低下率（ΔＮ１／Δｔ）が一定の基準値（Ｙ）未満の場合には、ステップＳ１７に進んで図３のＡ線のように、ＥＧＲ弁開度を速める。
また、ステップＳ１４で、エンジン回転数の低下率（ΔＮ１／Δｔ）が略一定の基準値（Ｙ）と等しい場合には、ステップＳ１５に進んで図３のＢ線のように、ＥＧＲ弁の開放速度はそれまでの基準開放速度を維持する制御を行う。 If the rate of decrease in engine speed (ΔN 1 / Δt) exceeds a certain reference value (Y) in step S12, the opening degree of the EGR valve is slowly increased as indicated by line C in FIG. 3 as in step S13. open.
In step S16, if the engine speed reduction rate (ΔN 1 / Δt) is less than a certain reference value (Y), the process proceeds to step S17 to accelerate the EGR valve opening as shown by line A in FIG. .
In step S14, if the engine speed reduction rate (ΔN 1 / Δt) is equal to the substantially constant reference value (Y), the process proceeds to step S15, and the EGR valve is turned on as shown by line B in FIG. The opening speed is controlled to maintain the standard opening speed.

以上第１実施形態によれば、エンジン回転数の低下量が大きいときは、ＥＧＲ弁開度をゆっくり開くことによって、ＥＧＲ弁１を通って吸気ポート１０３に還流するＥＧＲガスの流量の増加が緩慢になって新気のガス量が相対的に多くなることにより、エンジンの回転数の上昇が早くなる。
一方、エンジン回転数の低下量が小さいときは、ＥＧＲ弁開弁速度を速めることによって、ＥＧＲ弁を通って吸気ポートに還流するＥＧＲガスの流量の増加が増加し、新気のガス量が相対的に少なくなることにより、エンジンの回転数の上昇が緩慢になる。 As described above, according to the first embodiment, when the amount of decrease in the engine speed is large, the increase in the flow rate of the EGR gas flowing back to the intake port 103 through the EGR valve 1 is slowed by slowly opening the EGR valve opening. As a result, the amount of fresh gas is relatively increased, so that the engine speed increases rapidly.
On the other hand, when the amount of decrease in engine speed is small, increasing the EGR valve opening speed increases the increase in the flow rate of EGR gas flowing back to the intake port through the EGR valve, and the amount of fresh air is relatively low. As a result, the engine speed increases slowly.

また、第２実施形態によれば、エンジン回転数の低下量が大きくても、低下率が小さければ、エンジン回転数の変動への影響が少なく、直線ＡのようにＥＧＲ弁１の開弁速度を速めて、ＥＧＲ弁を通って吸気ポートに還流するＥＧＲガスを増加してＮＯｘ低減効果を優先する。
一方、エンジン回転数の低下量が大きく、低下率も大きい場合には、エンジン回転変動の影響をＮＯｘ低減効果より優先して、直線ＣのようにＥＧＲ弁１の開弁速度をゆっくり開くことによって、ＥＧＲ弁を通って吸気ポートに還流するＥＧＲガスの増加を緩慢にしてエンジンの回転数の上昇を早めてエンジン回転数を安定化させる。
このように、第２実施形態によれば、エンジン回転数の低下率を制御要素に加えることによって、エンジン回転数の変動低減と、ＥＧＲガス流量の増加によるＮＯｘ低減効果とをより効果的に達成できる。 Further, according to the second embodiment, even if the amount of decrease in the engine speed is large, if the rate of decrease is small, there is little influence on fluctuations in the engine speed, and the valve opening speed of the EGR valve 1 as shown by the straight line A expediting prioritizes NO x reduction effect by increasing the EGR gas recirculated to the intake port through the EGR valve.
On the other hand, a large amount of decrease in engine rotational speed, when the reduction rate is large, the influence of the engine speed fluctuation in preference to NO x reduction effect, slowly open it the opening speed of the EGR valve 1 as a straight line C Thus, the increase in the EGR gas flowing back to the intake port through the EGR valve is slowed down, and the engine speed is stabilized by speeding up the increase in the engine speed.
Thus, according to the second embodiment, by adding the reduction rate of the engine speed control element, and variation reduction of the engine speed, and a NO x reduction effect by increasing the EGR gas flow more effectively Can be achieved.

これにより、エンジン回転数の検出値によってＥＧＲ弁１の開度を適正に保持するので、ＥＧＲ弁１の開度によってＮＯｘ低減を行うとともに、エンジン回転数の大幅な低下を回避して、エンジン始動後のエンジン回転数の調整時にエンジン回転数が整定し、エンジンの始動性が向上し、始動時の回転数の変動、始動時燃費の悪化等の不具合を確実に回避できる。   As a result, the opening degree of the EGR valve 1 is appropriately maintained based on the detected value of the engine speed, so that NOx is reduced by the opening degree of the EGR valve 1 and a significant decrease in the engine speed is avoided to start the engine. When the engine speed is adjusted later, the engine speed is stabilized, the engine startability is improved, and problems such as fluctuations in the engine speed at start-up and deterioration in fuel consumption at start-up can be reliably avoided.

本発明によれば、ＥＧＲ制御装置を備えた４サイクルガスエンジンにおいて、エンジン回転数の整定時における大幅な回転数の低下の発生を回避して、エンジンの始動性を向上する４サイクルガスエンジンのＥＧＲ制御装置を提供できる。   According to the present invention, in a four-cycle gas engine equipped with an EGR control device, it is possible to avoid the occurrence of a significant decrease in the engine speed when the engine speed is set and to improve the engine startability. An EGR control device can be provided.

本発明の第１実施形態に係る４サイクルガスエンジンの全体構成図である。1 is an overall configuration diagram of a four-cycle gas engine according to a first embodiment of the present invention. 前記実施形態に係る４サイクルガスエンジンのＥＧＲ制御装置の制御ブロック図である。It is a control block diagram of the EGR control device of the 4-cycle gas engine according to the embodiment. 前記実施形態に係るＥＧＲ開度線図である。It is an EGR opening degree diagram concerning the embodiment. ＥＧＲ弁の開度制御の第２実施形態を示す制御フローチャートである。It is a control flowchart which shows 2nd Embodiment of the opening degree control of an EGR valve. 従来技術における変化線図である。It is a change diagram in a prior art.

符号の説明Explanation of symbols

１ ＥＧＲ弁
２ 回転数検出器
３ ＥＧＲ温度センサ（エンジン暖機状態検出部）
４ 排ガス熱交換器
５ ＥＧＲ弁制御装置
７ ＥＧＲ管
１００ エンジン
１０１ 燃焼室
１０２ ピストン
１０３ 吸気ポート
１０４ 吸気弁
１０５ 排気ポート
１０６ 排気弁
１０７ 着火装置
１０９ ガス量調整弁
１１０ ガスミキサー
１１１ 燃料ガス管
１１２ クランク軸
１１５ スロットル弁 1 EGR valve 2 Rotation speed detector 3 EGR temperature sensor (engine warm-up state detector)
4 exhaust gas heat exchanger 5 EGR valve control device 7 EGR pipe 100 engine 101 combustion chamber 102 piston 103 intake port 104 intake valve 105 exhaust port 106 exhaust valve 107 ignition device 109 gas amount adjusting valve 110 gas mixer 111 fuel gas pipe 112 crankshaft 115 Throttle valve

Claims (4)

エンジンの排気通路からの排気ガスの一部をＥＧＲガスとして吸気ポートに還流するＥＧＲガス通路と、該ＥＧＲガス通路の通路面積を制御するＥＧＲ弁とを備えた４サイクルガスエンジンにおいて、
前記エンジンの回転数を検出する回転数検出器と、前記回転数検出器からのエンジン回転数の検出値が入力されるＥＧＲ弁制御装置とを備え、該ＥＧＲ弁制御装置は、前記ＥＧＲ弁の開弁期間中であって前記エンジン回転数の低下量が一定値を超えたとき前記ＥＧＲ弁の開弁速度を低下させてエンジン回転数の低下を抑制することを特徴とする４サイクルガスエンジンのＥＧＲ制御装置。 In a four-cycle gas engine including an EGR gas passage that recirculates a part of exhaust gas from the exhaust passage of the engine to the intake port as EGR gas, and an EGR valve that controls a passage area of the EGR gas passage,
A rotation speed detector for detecting the rotation speed of the engine; and an EGR valve control device to which a detection value of the engine rotation speed from the rotation speed detector is input. The EGR valve control device includes: A four-cycle gas engine characterized by suppressing a decrease in engine speed by decreasing the valve opening speed of the EGR valve when a decrease amount of the engine speed exceeds a certain value during a valve opening period. EGR control device. 前記ＥＧＲ弁制御装置は、前記ＥＧＲ弁の開弁期間中であって前記エンジン回転数の低下量が前記一定値以内にあるときは、前記ＥＧＲ弁の開弁速度を一定速度以上に保持してエンジン回転数を一定速度に維持することを特徴とする請求項１記載の４サイクルガスエンジンのＥＧＲ制御装置。   The EGR valve control device holds the valve opening speed of the EGR valve at a predetermined speed or more when the decrease in the engine speed is within the predetermined value during the valve opening period of the EGR valve. 2. The EGR control apparatus for a four-cycle gas engine according to claim 1, wherein the engine speed is maintained at a constant speed. 前記ガスエンジンの暖機状態を検出するエンジン暖機状態検出部を備え、該エンジン暖機状態検出部で暖機中を検出したとき、前記ＥＧＲ弁の開弁速度を低下させてエンジン回転数の低下を抑制することを特徴とする請求項１記載の４サイクルガスエンジンのＥＧＲ制御装置。   An engine warm-up state detection unit that detects a warm-up state of the gas engine, and when the engine warm-up state detection unit detects that the engine is warming up, the valve opening speed of the EGR valve is decreased to The EGR control device for a four-cycle gas engine according to claim 1, wherein the decrease is suppressed. 前記暖機状態検出部が前記ＥＧＲガスのガス温度検出部であることを特徴とする請求項３記載の４サイクルガスエンジンのＥＧＲ制御装置。   The EGR control apparatus for a four-cycle gas engine according to claim 3, wherein the warm-up state detection unit is a gas temperature detection unit of the EGR gas.
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