JP3073380B2 - Hydraulic working machine equipped with exhaust gas purification device - Google Patents
Hydraulic working machine equipped with exhaust gas purification deviceInfo
- Publication number
- JP3073380B2 JP3073380B2 JP05318200A JP31820093A JP3073380B2 JP 3073380 B2 JP3073380 B2 JP 3073380B2 JP 05318200 A JP05318200 A JP 05318200A JP 31820093 A JP31820093 A JP 31820093A JP 3073380 B2 JP3073380 B2 JP 3073380B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- engine
- hydraulic pump
- pressure
- discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Processes For Solid Components From Exhaust (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は排ガス浄化装置を備えた
油圧作業機械に係り、特に、排ガス浄化装置の性能を常
時好適状態に保つためのエンジンの制御手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an exhaust gas purifying apparatus.
The present invention relates to a hydraulic working machine, and more particularly, to an engine control unit for always maintaining the performance of an exhaust gas purifying device in a suitable state.
【０００２】[0002]
【従来の技術】図６に、従来より知られている排ガス浄
化装置を備えた油圧作業機械の構成例を示す。この図に
おいて、１はエンジン、２はエンジン１の排気口に連設
された排ガス浄化装置を示している。また、３はエンジ
ン１によって駆動される可変容量型油圧ポンプ、４は油
圧ポンプ３の出力を制御するレギュレータ、５は油圧ポ
ンプ３の出口管路に設けられた圧力補償弁、６は圧力補
償弁５の出口ポートに設けられたチェック弁、７は油圧
ポンプ３から吐出される圧油の流れを切り換える制御
弁、８は制御弁５の出口管路に接続された油圧モータあ
るいは油圧シリンダなどのアクチュエータ、９は油圧ポ
ンプ３から吐出される圧油のリリーフ圧及びアンロード
圧を制御する切換弁、１０は油圧ポンプ３の吐出圧とア
クチュエータ８の負荷圧との差圧を検出する差圧セン
サ、１１は圧油タンクを示している。2. Description of the Related Art FIG. 6 shows a configuration example of a hydraulic working machine provided with a conventionally known exhaust gas purifying apparatus. In this figure, reference numeral 1 denotes an engine, and 2 denotes an exhaust gas purification device connected to an exhaust port of the engine 1. Reference numeral 3 denotes a variable displacement hydraulic pump driven by the engine 1, 4 denotes a regulator for controlling the output of the hydraulic pump 3, 5 denotes a pressure compensating valve provided in an outlet line of the hydraulic pump 3, 6 denotes a pressure compensating valve 5 is a check valve provided at an outlet port, 7 is a control valve for switching the flow of pressure oil discharged from the hydraulic pump 3, and 8 is an actuator such as a hydraulic motor or a hydraulic cylinder connected to the outlet line of the control valve 5. , 9 is a switching valve for controlling the relief pressure and unload pressure of the hydraulic oil discharged from the hydraulic pump 3, 10 is a differential pressure sensor for detecting a differential pressure between the discharge pressure of the hydraulic pump 3 and the load pressure of the actuator 8, Reference numeral 11 denotes a pressure oil tank.
【０００３】排ガス浄化装置２は、図７に示すように、
例えば白金等の酸化触媒付きの多孔質体１２を排ガス流
路１３中に介在させてなるフィルタ１４を容器１５内に
収納したものであって、例えばエンジン１の排気管に取
り付けられ、排ガス中の炭化水素（ＨＣ）及び一酸化炭
素（ＣＯ）を燃焼してＨ2 Ｏ及びＣＯ2 に変化し、無害
化する。[0003] As shown in FIG.
For example, a filter 14 in which a porous body 12 having an oxidation catalyst such as platinum is interposed in an exhaust gas passage 13 is housed in a container 15, and is attached to, for example, an exhaust pipe of the engine 1 and has a The hydrocarbons (HC) and carbon monoxide (CO) are burned and changed to H 2 O and CO 2 , which renders them harmless.
【０００４】従来の排ガス浄化装置を備えた油圧作業機
械にあっては、図６に示すように、排ガス浄化装置２に
おける処理状況に応じてエンジン１の運転条件を制御す
る手段が何ら設けられていない。[0004] In a hydraulic working machine equipped with a conventional exhaust gas purifying apparatus, as shown in FIG. 6, there is provided any means for controlling the operating conditions of the engine 1 in accordance with the processing status of the exhaust gas purifying apparatus 2. Absent.
【０００５】[0005]
【発明が解決しようとする課題】エンジン１は、制御弁
７が全開位置に切り換えられたときには、図８にβで示
すように、作業に必要な最大流量かつ最高圧力の圧油
（Ｐ＝Ｐ2，Ｑ＝Ｑ2）を油圧ポンプ３から吐出可能な最
大出力ＰＳmaxまで出力を上昇して運転されるが、制御
弁７が中立位置にあるときには、燃料消費量の低減及び
騒音の緩和等を図るため、図８にαで示すように、油圧
回路の冷却及び潤滑に必要な最小流量かつ最低圧力の圧
油（Ｐ＝Ｐ1，Ｑ＝Ｑ1）を油圧ポンプ３から吐出可能な
最小出力ＰＳminまで出力を落して運転される。The engine 1 has a control valve.
When the switch 7 is switched to the fully open position, the hydraulic pump 3 can discharge the pressurized oil (P = P 2 , Q = Q 2 ) having the maximum flow rate and the highest pressure necessary for the work, as indicated by β in FIG. The operation is performed by increasing the output up to the maximum output PS max . When the control valve 7 is in the neutral position, in order to reduce fuel consumption and reduce noise, as shown by α in FIG. The operation is performed by reducing the output of the pressure oil (P = P 1 , Q = Q 1 ) of the minimum flow rate and the minimum pressure required for cooling and lubrication to the minimum output PS min that can be discharged from the hydraulic pump 3.
【０００６】また、エンジン出力と排ガス温度とは密接
な関係があり、図９に示すように、エンジン出力にほぼ
比例して排ガス温度も低下する。Further, there is a close relationship between the engine output and the exhaust gas temperature, and as shown in FIG. 9, the exhaust gas temperature decreases almost in proportion to the engine output.
【０００７】ところで、酸化触媒は、排ガス温度が当該
酸化触媒に特有の所定温度以上にならないと有効な触媒
効果を発揮できないが、エンジンの排ガス浄化用として
一般に用いられている白金触媒の場合には当該所定温度
が約４００℃であり、図９に示すようにエンジン出力が
最小出力ＰＳmin まで絞られているときには、排ガス温
度が酸化触媒の機能を発揮できる温度Ｔ0 （白金触媒の
場合には約４００℃）まで上昇しないThe oxidation catalyst cannot exhibit an effective catalytic effect unless the exhaust gas temperature exceeds a predetermined temperature specific to the oxidation catalyst. However, in the case of a platinum catalyst generally used for purifying exhaust gas of an engine, it cannot be used. When the predetermined temperature is about 400 ° C. and the engine output is reduced to the minimum output PS min as shown in FIG. 9 , the exhaust gas temperature becomes the temperature T 0 at which the function of the oxidation catalyst can be exhibited (in the case of a platinum catalyst, Does not rise to about 400 ° C)
【０００８】かかる運転条件の下でエンジン１が運転さ
れ続けると、排ガス中のＨＣやＣＯが燃焼されず、多孔
質体１２の表面に詰まるという現象が生じ、エンジン１
の排気抵抗が過大になって安定かつ良好なエンジン出力
が得られなくなったり、エンジン１の寿命を害するとい
った不都合を生じる。If the engine 1 is continuously operated under such operating conditions, HC and CO in the exhaust gas are not burned, and a phenomenon that the surface of the porous body 12 is clogged occurs.
The exhaust resistance becomes excessive, so that stable and good engine output cannot be obtained or the life of the engine 1 is impaired.
【０００９】本発明は、かかる事情に鑑みてなされたも
のであって、その目的は、排ガス浄化装置にＨＣやＣＯ
ガスの目詰まりを生ぜず、したがってエンジンを安定に
運転できて、エンジン寿命の延長が図れる油圧作業機械
を提供することにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an exhaust gas purifying apparatus with HC or CO.
It is an object of the present invention to provide a hydraulic working machine that does not cause gas clogging, can stably operate an engine, and can extend the life of the engine.
【００１０】[0010]
【課題を解決するための手段】本発明は、前記の目的を
達成するため、エンジンと、該エンジンの排気口に連設
された排ガス浄化装置と、前記エンジンによって駆動さ
れる可変容量型油圧ポンプと、該油圧ポンプから吐出さ
れる圧油の吐出量及び吐出圧力を制御する機能を有する
制御装置とを備えた油圧作業機械において、前記排ガス
浄化装置の入口側にエンジンの排気抵抗を検出する圧力
検出器を設けると共に、前記制御装置に、該圧力検出器
の検出値が予め定められた所定値以上になったとき、前
記可変容量型油圧ポンプから吐出される圧油の吐出量及
び吐出圧力を同時に上昇させる信号を出力し、前記エン
ジンの排ガス温度を前記排ガス浄化装置が具備している
排ガス浄化機能を正常に発揮しえる温度以上に上昇させ
る機能を付加した。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an engine, an exhaust gas purification device connected to an exhaust port of the engine, and a variable displacement hydraulic pump driven by the engine. And discharged from the hydraulic pump
Control device having a function of controlling the discharge amount and discharge pressure of pressurized oil to be supplied, a pressure detector for detecting exhaust resistance of an engine is provided at an inlet side of the exhaust gas purification device. together, to the control device, when the detection value of the pressure detector is equal to or greater than a predetermined value, before
Discharge volume and pressure oil discharged from the variable displacement hydraulic pump
And a signal to simultaneously increase the discharge pressure.
The exhaust gas purifier has the exhaust gas temperature of gin
Raise the temperature above the temperature at which the exhaust gas purification function can be performed normally.
It was added to that function.
【００１１】この場合、可変容量型油圧ポンプの吐出管
路に介設された制御弁が開状態にあるときにエンジン出
力値が変更されると、オペレータの意図しない動きを油
圧アクチュエータがする危険性があるため、これを防止
すべく、前記制御弁の操作レバーに中立検出スイッチを
付設し、前記制御弁が中立位置にあるときのみ、前記制
御装置に前記の機能を発揮させるようにすることが特に
好ましい。In this case, if the engine output value is changed while the control valve interposed in the discharge line of the variable displacement hydraulic pump is open, there is a risk that the hydraulic actuator may make unintended movements by the operator. Therefore, in order to prevent this, a neutral detection switch may be attached to the operation lever of the control valve, and the control device may perform the above function only when the control valve is in the neutral position. Particularly preferred.
【００１２】[0012]
【作用】フィルタが目詰まりをおこすと、その程度によ
ってエンジンの排気抵抗が高くなるので、排ガス浄化装
置の入口側に圧力検出器を設定し、エンジンの排気抵抗
を測定することによって、フィルタの目詰まりの程度を
知ることができる。また前記したように、エンジン出力
を高くすると排ガス温度が上昇するので、エンジン出力
を所定の値に調整することによって、排ガス温度を排ガ
ス浄化装置が具備している排ガス浄化機能を正常に発揮
しえる温度以上に上昇できる。When the filter is clogged, the exhaust resistance of the engine increases depending on the degree of the clogging. Therefore, a pressure detector is set at the inlet side of the exhaust gas purification device, and the exhaust resistance of the engine is measured. You can know the degree of clogging. Further, as described above, when the engine output is increased, the exhaust gas temperature rises. Therefore, by adjusting the engine output to a predetermined value, the exhaust gas temperature can be normally exhibited by the exhaust gas purifying function provided in the exhaust gas purifying device. Can rise above temperature.
【００１３】したがって、フィルタの目詰まりがエンジ
ンに悪影響を及ぼすに至る以前に、エンジン出力を高め
て排ガス温度を上昇すれば、フィルタに詰った未燃焼の
ＨＣやＣＯを燃焼して取り除くことができ、排気抵抗の
増加を防止できる。よって、エンジンの安定かつ良好な
運転を確保でき、エンジン寿命の延長も図れる。また、
制御弁の操作レバーに中立検出スイッチを付設し、制御
弁が中立位置にあるときのみ制御装置からレギュレータ
に所要の信号を出力してエンジン出力を高めるようにす
れば、油圧ポンプから吐出される圧油の圧力が高くなっ
ても油圧アクチュエータがオペレータの意図しない動き
をすることがないので、安全性に優れる。 Therefore, if the engine output is increased and the exhaust gas temperature is raised before the filter clogging adversely affects the engine, unburned HC and CO clogged in the filter can be removed by burning. Thus, an increase in exhaust resistance can be prevented. Therefore, stable and favorable operation of the engine can be secured, and the life of the engine can be extended. Also,
A neutral detection switch is attached to the operation lever of the control valve to control
Only when the valve is in the neutral position does the regulator
Output the required signal to increase the engine output.
If the pressure of the hydraulic oil discharged from the hydraulic pump increases,
Even if the hydraulic actuator moves unintentionally by the operator
Because it does not do, it is excellent in safety.
【００１４】[0014]
〈第１実施例〉図１に、第１実施例に係る作業機械の構
成図を示す。この図において、１６は圧力検出器、１７
は制御装置を示し、その他、前出の図６と対応する部分
には、それと同一の符号が表示されている。<First Embodiment> FIG. 1 shows a configuration diagram of a working machine according to a first embodiment. In this figure, 16 is a pressure detector, 17
Indicates a control device, and other portions corresponding to those in FIG. 6 described above are denoted by the same reference numerals.
【００１５】圧力検出器１６は、排ガス浄化装置２の入
口側に取り付けられ、エンジン１の排気抵抗を検出す
る。制御装置１７は、前記圧力検出器１６からの排気抵
抗信号ａと差圧センサ１０からの差圧信号ｂとを入力し
て、排気抵抗信号ａが予め定められた所定値以上になっ
たとき、排ガス浄化装置２が具備している排ガス浄化機
能を正常に発揮しえる温度以上にエンジン１の排ガス温
度を上昇可能な値までエンジン出力値を高める信号ｃを
レギュレータ４に出力すると共に、開信号ｄを切換弁９
に出力する。The pressure detector 16 is mounted on the inlet side of the exhaust gas purifying device 2 and detects the exhaust resistance of the engine 1. The control device 17 inputs the exhaust resistance signal a from the pressure detector 16 and the differential pressure signal b from the differential pressure sensor 10, and when the exhaust resistance signal a becomes equal to or greater than a predetermined value, A signal c for increasing the engine output value to a value at which the exhaust gas temperature of the engine 1 can be raised above a temperature at which the exhaust gas purifying function of the exhaust gas purifying device 2 can be normally exhibited is output to the regulator 4, and an open signal d Switching valve 9
Output to
【００１６】図２は、フィルタ１４の目詰まり量とエン
ジン１の排気抵抗の大きさとの関係を示すグラフ図であ
って、この図から明らかなように、フィルタ１４の目詰
まり量が高くなると、エンジン１の排気抵抗が指数関数
的に大きくなる。FIG. 2 is a graph showing the relationship between the amount of clogging of the filter 14 and the magnitude of the exhaust resistance of the engine 1. As is apparent from FIG. 2, as the amount of clogging of the filter 14 increases, The exhaust resistance of the engine 1 increases exponentially.
【００１７】制御装置１７は、許容されるフィルタ１４
の目詰まり量すなわちエンジン１の許容排気抵抗値ΔＰ
1 を記憶しており、かつ図３に示すように、排気抵抗信
号ａの大きさΔＰa が許容排気抵抗値ΔＰ1 を超えたか
否かを常時監視している（手順Ｓ−１）。そして、手順
Ｓ−１において、検出信号ΔＰa が許容排気抵抗値ΔＰ
1 を超えたと判定されたときには、前出の図８に示した
Ｐ＝Ｐ2 ，Ｑ＝Ｑ2 の圧油を可変容量型油圧ポンプ３か
ら吐出させるための信号ｃをレギュレータ４に出力する
と共に、切換弁９に開信号ｄを出力する（手順Ｓ−
２）。これによってエンジン出力が最大出力ＰＳmax と
なり、図９に示すように、排ガス温度が排ガス浄化装置
２に設けられた酸化触媒の機能を発揮できる温度Ｔ0 以
上に上昇するので、フィルタ１４に詰まったＨＣやＣＯ
が燃焼されて除去され、エンジン１の排気抵抗が再び低
下する。したがって、エンジン性能が不安定になったり
エンジン寿命が害されるということがない。なお、可変
容量型油圧ポンプ３から吐出された圧油は、切換弁９を
介して圧油タンク１１に戻される。The control device 17 includes a filter 14
, That is, the allowable exhaust resistance value ΔP of the engine 1
1 stores the, and as shown in FIG. 3, monitors whether the magnitude [Delta] P a of the exhaust resistance signal a exceeds the allowable exhaust resistance [Delta] P 1 always (Step S-1). Then, in step S-1, the detection signal ΔP a becomes the allowable exhaust resistance value ΔP
When it is determined that the value exceeds 1 , the signal c for discharging the pressure oil of P = P 2 and Q = Q 2 shown in FIG. , Outputs an open signal d to the switching valve 9 (procedure S-
2). As a result, the engine output reaches the maximum output PS max , and as shown in FIG. 9, the exhaust gas temperature rises to a temperature T 0 or higher at which the function of the oxidation catalyst provided in the exhaust gas purification device 2 can be exhibited. HC and CO
Is burned and removed, and the exhaust resistance of the engine 1 decreases again. Therefore, the engine performance does not become unstable or the engine life is not affected. The pressure oil discharged from the variable displacement hydraulic pump 3 is returned to the pressure oil tank 11 via the switching valve 9.
【００１８】圧力検出器１６の検出信号ΔＰa が許容排
気抵抗値ΔＰ1 より低下すると、手順Ｓ−１において
「ＮＯ」と判定される。この場合には、前出の図８に示
したＰ＝Ｐ1 ，Ｑ＝Ｑ1 の圧油を可変容量型油圧ポンプ
３から吐出させるための信号ｃがレギュレータ４に出力
され、また切換弁９に閉信号ｄが出力される（手順Ｓ−
３）。これによってエンジン出力が最小出力ＰＳmin と
なり、燃料消費量の低減及び騒音の緩和等が図られる。[0018] Detection signals [Delta] P a pressure detector 16 becomes lower than the allowable exhaust resistance value [Delta] P 1, is determined to be "NO" in step S-1. In this case, the signal c for discharging the pressure oil of P = P 1 and Q = Q 1 shown in FIG. 8 from the variable displacement hydraulic pump 3 is output to the regulator 4 and the switching valve 9 Is output to the controller (procedure S-
3). As a result, the engine output becomes the minimum output PS min , so that the fuel consumption can be reduced and noise can be reduced.
【００１９】〈第２実施例〉図４に、第２実施例に係る
作業機械の構成図を示す。この図において、１８は制御
弁の中立検出スイッチ、１９は当該スイッチの切換信号
を生成するための電源を示し、その他、前出の図１と対
応する部分には、それと同一の符号が表示されている。<Second Embodiment> FIG. 4 shows a configuration diagram of a working machine according to a second embodiment. In this figure, reference numeral 18 denotes a neutral detection switch of a control valve, 19 denotes a power supply for generating a switching signal of the switch, and other portions corresponding to those in FIG. 1 are denoted by the same reference numerals. ing.
【００２０】中立検出スイッチ１８は、制御弁７が中立
位置にあるときに、中立位置信号ｅを制御装置１７に出
力する。なお、中立検出スイッチ１８は、制御弁７が中
立位置にあるときに電源１９からの電力の供給を受けて
“Ｈ”の信号ｅを出力するように構成することもできる
し、反対に、制御弁７が中立位置にあるときに電源１９
からの電力の供給を断って“Ｌ”の信号ｅを出力するよ
うに構成することもできる。The neutral detecting switch 18 outputs a neutral position signal e to the control device 17 when the control valve 7 is at the neutral position.
Power. The neutral detection switch 18 is provided when the control valve 7 is in the middle position.
When the control valve 7 is in the neutral position, the power supply 19 can be configured to receive the supply of power from the power supply 19 to output the signal e of “H”.
It is also possible to configure such that the supply of power from the power supply is cut off and the signal e of "L" is output.
【００２１】制御装置１７は、前記圧力検出器１６から
の排気抵抗信号ａと差圧センサ１０からの差圧信号ｂと
中立検出スイッチ１８からの中立位置信号ｅとを入力
し、当該中立位置信号ｅが入力している場合において排
気抵抗信号ａが予め定められた所定値以上になったと
き、排ガス浄化装置２が具備している排ガス浄化機能を
正常に発揮しえる温度以上にエンジン１の排ガス温度を
上昇可能な値までエンジン出力値を高める信号ｃをレギ
ュレータ４に出力すると共に、開信号ｄを切換弁９に出
力する。以下、当該制御装置１７における制御手順を図
５に示すフローチャートに基づいて説明する。制御装置
１７は、図５に示すように、制御弁７が中立位置にある
か否かを常時監視している（手順Ｓ−１１）。そして、
手順Ｓ−１１において、制御弁７が中立位置にあると判
定されたときには、手順Ｓ−１２に移行し、第１実施例
における手順Ｓ−１〜手順Ｓ−３と同一の手順（手順Ｓ
−１２〜手順Ｓ−１４）で、エンジン出力の調整と切換
弁９の開閉とを行う。また、手順Ｓ−１１において、制
御弁７が中立位置から切換位置に切り換えられたと判定
されたときには、手順Ｓ−１４に移行し、前出の図８に
示したＰ＝Ｐ1，Ｑ＝Ｑ1の圧油を可変容量型油圧ポンプ
３から吐出させるための信号ｃがレギュレータ４に出力
されると共に、切換弁９に閉信号ｄが出力される。この
ようにすると、制御弁７が開状態にあるときにはエンジ
ン出力が上昇しないので、油圧アクチュエータ８がオペ
レータの意図しない動きをする危険性が解消され、安全
性が確保される。The control device 17 receives a signal from the pressure detector 16
And the differential pressure signal b from the differential pressure sensor 10
Input neutral position signal e from neutral detection switch 18
When the neutral position signal e is input.
When the air resistance signal a becomes equal to or greater than a predetermined value.
The exhaust gas purifying function of the exhaust gas purifying device 2
Exhaust gas temperature of engine 1 higher than normal
The signal c that raises the engine output value to a value that can rise
Output to the changeover valve 9 and the open signal d to the switching valve 9.
Power. Hereinafter, a control procedure in the control device 17 will be described.
This will be described based on the flowchart shown in FIG. As shown in FIG. 5, the control device 17 constantly monitors whether the control valve 7 is at the neutral position (step S-11). And
When it is determined in step S-11 that the control valve 7 is at the neutral position, the process proceeds to step S-12, and the same procedure (procedure S-3) as procedure S-1 to procedure S-3 in the first embodiment is performed.
In steps S-12 to S-14), the engine output is adjusted and the switching valve 9 is opened and closed. Further, in step S-11, when the control valve 7 is determined to have been switched to the switching position from the neutral position, the process proceeds to step S-14, P = P 1 shown in FIG. 8, supra, Q = Q A signal c for discharging the first pressure oil from the variable displacement hydraulic pump 3 is output to the regulator 4, and a close signal d is output to the switching valve 9. By doing so, the engine output does not increase when the control valve 7 is in the open state, so that the danger of the hydraulic actuator 8 moving unintended by the operator is eliminated, and safety is ensured.
【００２２】なお、前記各実施例においては、圧力検出
器１６の検出値ΔＰa が許容排気抵抗値ΔＰ1 を超えた
とき、エンジン出力を最大出力まで上昇したが、必ずし
もエンジン出力を最大出力まで上昇する必要はなく、排
ガス浄化装置２が具備している排ガス浄化機能を正常に
発揮しえる温度以上に排ガス温度を上昇可能な出力値ま
で上昇すれば足りる。[0022] Incidentally, in the above each embodiment, when the detected value [Delta] P a of the pressure detector 16 has exceeded the allowable exhaust resistance [Delta] P 1, was increased the engine output to a maximum output, until necessarily the maximum output engine power It is not necessary to increase the temperature, and it suffices that the exhaust gas temperature be raised to an output value at which the exhaust gas temperature can be increased to a temperature higher than a temperature at which the exhaust gas purification function of the exhaust gas purification device 2 can be normally performed.
【００２３】また、前記各実施例においては、クローズ
ドセンタ・ロードセンシング・システムをなす油圧回路
を備えた作業機械に適用した場合を例にとって説明した
が、他の回路構成を有する油圧回路を備えた作業機械に
も適用できることは勿論である。In each of the above embodiments, the case where the present invention is applied to a working machine having a hydraulic circuit forming a closed center load sensing system has been described as an example. However, a hydraulic circuit having another circuit configuration is provided. Of course, it can be applied to work machines.
【００２４】[0024]
【発明の効果】請求項１に記載の発明は、フィルタの目
詰まりがエンジンに悪影響を及ぼすに至る以前にエンジ
ン出力が高められ、排ガス温度が上昇されてフィルタに
詰った未燃焼のＨＣやＣＯが取り除かれるので、排気抵
抗の増加が防止され、エンジンの安定かつ良好な運転を
確保できると共に、エンジン寿命の延長が図られる。請
求項２に記載の発明は、制御弁の操作レバーに中立検出
スイッチを付設し、制御弁が中立位置にあるときのみ制
御装置からレギュレータに所要の信号を出力してエンジ
ン出力を高めるようにしたので、油圧ポンプから吐出さ
れる圧油の圧力が高くなっても油圧アクチュエータがオ
ペレータの意図しない動きをすることがなく、安全性に
優れる。 According to the first aspect of the present invention, the unburned HC or CO unburned in the filter is increased before the engine output is increased and the exhaust gas temperature is increased before the filter clogging adversely affects the engine. Is removed, an increase in exhaust resistance is prevented, stable and favorable operation of the engine can be ensured, and the life of the engine can be extended. Contract
According to the invention as set forth in claim 2, the operation lever of the control valve is detected as neutral.
A switch is attached to control only when the control valve is in the neutral position.
The required signal is output from the controller to the regulator,
Output from the hydraulic pump.
The hydraulic actuator is turned off even if the pressure of
No unintended movement of the pererator for safety
Excellent.
【図１】第１実施例に係る作業機械の構成図である。FIG. 1 is a configuration diagram of a working machine according to a first embodiment.
【図２】フィルタの目詰まり量とエンジンの排気抵抗と
の関係を示すグラフ図である。FIG. 2 is a graph showing a relationship between a clogging amount of a filter and an exhaust resistance of an engine.
【図３】第１実施例に係る作業機械に搭載された制御装
置の動作手順を示すフローチャートである。FIG. 3 is a flowchart illustrating an operation procedure of a control device mounted on the work machine according to the first embodiment.
【図４】第２実施例に係る作業機械の構成図である。FIG. 4 is a configuration diagram of a working machine according to a second embodiment.
【図５】第２実施例に係る作業機械に搭載された制御装
置の動作手順を示すフローチャートである。FIG. 5 is a flowchart illustrating an operation procedure of a control device mounted on a working machine according to a second embodiment.
【図６】従来例に係る作業機械の構成図である。FIG. 6 is a configuration diagram of a working machine according to a conventional example.
【図７】排ガス浄化装置の断面図である。FIG. 7 is a cross-sectional view of the exhaust gas purifying apparatus.
【図８】ポンプ入力特性図である。FIG. 8 is a pump input characteristic diagram.
【図９】エンジン出力と排気温度との関係を示すグラフ
図である。FIG. 9 is a graph showing the relationship between engine output and exhaust temperature.
１ エンジン ２ 排ガス浄化装置 ３ 可変容量型油圧ポンプ ４ レギュレータ ７ 制御弁 ８ アクチュエータ ９ 切換弁 １０ 差圧センサ １２ 多孔質体 １３ 排ガス流路 １４ フィルタ １６ 圧力検出器 １７ 制御装置 １８ 中立検出スイッチ DESCRIPTION OF SYMBOLS 1 Engine 2 Exhaust gas purifier 3 Variable displacement hydraulic pump 4 Regulator 7 Control valve 8 Actuator 9 Switching valve 10 Differential pressure sensor 12 Porous body 13 Exhaust gas flow path 14 Filter 16 Pressure detector 17 Control device 18 Neutral detection switch
Claims (2)
された排ガス浄化装置と、前記エンジンによって駆動さ
れる可変容量型油圧ポンプと、該油圧ポンプから吐出さ
れる圧油の吐出量及び吐出圧力を制御する機能を有する
制御装置とを備えた油圧作業機械において、前記排ガス
浄化装置の入口側にエンジンの排気抵抗を検出する圧力
検出器を設けると共に、前記制御装置に、該圧力検出器
の検出値が予め定められた所定値以上になったとき、前
記可変容量型油圧ポンプから吐出される圧油の吐出量及
び吐出圧力を同時に上昇させる信号を出力し、前記エン
ジンの排ガス温度を前記排ガス浄化装置が具備している
排ガス浄化機能を正常に発揮しえる温度以上に上昇させ
る機能を付加したことを特徴とする排ガス浄化装置を備
えた油圧作業機械。1. An engine, an exhaust gas purification device connected to an exhaust port of the engine, a variable displacement hydraulic pump driven by the engine, and a discharge pump from the hydraulic pump.
Control device having a function of controlling the discharge amount and discharge pressure of pressurized oil to be supplied, a pressure detector for detecting exhaust resistance of an engine is provided at an inlet side of the exhaust gas purification device. together, to the control device, when the detection value of the pressure detector is equal to or greater than a predetermined value, before
Discharge volume and pressure oil discharged from the variable displacement hydraulic pump
And a signal to simultaneously increase the discharge pressure.
The exhaust gas purifier has the exhaust gas temperature of gin
Raise the temperature above the temperature at which the exhaust gas purification function can be performed normally.
Hydraulic working machine provided with an exhaust gas purifying apparatus is characterized in that added to that function.
制御弁を介して油圧アクチュエータが接続された請求項
１記載の油圧作業機械において、前記制御弁の操作レバ
ーに中立検出スイッチを付設し、前記制御弁が中立位置
にあるときのみ、前記制御装置に前記機能を発揮させる
ことを特徴とする排ガス浄化装置を備えた油圧作業機
械。2. The hydraulic work machine according to claim 1, wherein a hydraulic actuator is connected to a discharge line of the variable displacement hydraulic pump via a control valve, and a neutral detection switch is provided on an operation lever of the control valve. A hydraulic working machine equipped with an exhaust gas purifying device, wherein the control device performs the function only when the control valve is at a neutral position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05318200A JP3073380B2 (en) | 1993-12-17 | 1993-12-17 | Hydraulic working machine equipped with exhaust gas purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05318200A JP3073380B2 (en) | 1993-12-17 | 1993-12-17 | Hydraulic working machine equipped with exhaust gas purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07166840A JPH07166840A (en) | 1995-06-27 |
| JP3073380B2 true JP3073380B2 (en) | 2000-08-07 |
Family
ID=18096562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05318200A Expired - Lifetime JP3073380B2 (en) | 1993-12-17 | 1993-12-17 | Hydraulic working machine equipped with exhaust gas purification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3073380B2 (en) |
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