JPH08200138A - Engine stop preventing device - Google Patents

Engine stop preventing device

Info

Publication number
JPH08200138A
JPH08200138A JP725795A JP725795A JPH08200138A JP H08200138 A JPH08200138 A JP H08200138A JP 725795 A JP725795 A JP 725795A JP 725795 A JP725795 A JP 725795A JP H08200138 A JPH08200138 A JP H08200138A
Authority
JP
Japan
Prior art keywords
engine
rack position
load
controller
full
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP725795A
Other languages
Japanese (ja)
Inventor
Nobuyuki Ishii
信行 石井
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.)
Sumitomo SHI Construction Machinery Co Ltd
Original Assignee
Sumitomo SHI Construction Machinery Co Ltd
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 Sumitomo SHI Construction Machinery Co Ltd filed Critical Sumitomo SHI Construction Machinery Co Ltd
Priority to JP725795A priority Critical patent/JPH08200138A/en
Publication of JPH08200138A publication Critical patent/JPH08200138A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

PURPOSE: To prevent engine stalling by judging the engine overloading state by a means for detecting the magnitude of the engine load, and decreasing the engine load in the overloading. CONSTITUTION: An engine rotational signal N detected by an engine rotational sensor 8 is read by a controller 7, and the full rack position for showing the state where the engine load is 100% or more is calculated on the basis of the engine rotational signal N. The rack position Ra detected by a rack sensor 2 is read by the controller 7, the fullrack position and the rack position Ra are compared with each other. If the rack position Ra >= the full rack position, an input signal Rz is converted into a voltage signal V and output to an electromagnetic proportional valve controller 6, so that the value of the input signal Rz to a regulator 4 from an electromagnetic proportional pressure reducing valve 5 is increased only by ΔP, and the control current Isol is output to the electromagnetic proportional pressure reducing valve 5. Secondary pressure of the electromagnetic proportional pressure reducing valve 5 satisfies Pz=Pz+ΔP according to the control current Isol, and the pump horsepower is decreased.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、建設機械等のエンジン
停止防止装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine stop prevention device for construction machines and the like.

【0002】[0002]

【従来の技術】従来、作業中にエンスト(エンジン停
止)に陥りそうになると、オペレ−タはアクセルペダル
を急激に踏み込んだり、操作レバ−を中立に戻したり、
といったような煩雑な操作が必要であった。従って、作
業性を損ねる、オペレ−タの疲労が増すといった問題が
あった。
2. Description of the Related Art Conventionally, when an engine stalls (engine stop) during work, the operator suddenly depresses the accelerator pedal or returns the operating lever to neutral.
Such a complicated operation was required. Therefore, there are problems that workability is impaired and operator fatigue increases.

【0003】[0003]

【発明が解決しようとする課題】本発明は、従来技術の
問題点に鑑み、オペレ−タがエンストに悩まされること
なく、建設機械等の作業に集中できるようにすることに
より、操作性を向上することを目的とする。
SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention improves the operability by allowing the operator to concentrate on the work such as construction machinery without being bothered by the engine stall. The purpose is to do.

【0004】[0004]

【課題を解決するための手段】エンジン回転数を検出す
る手段と、エンジンの負荷の大きさを検出する手段と、
エンジン負荷を低減する手段と、コントロ−ラとを有
し、該コントロ−ラに、前記エンジン回転数を検出する
手段よりエンジン回転数を読み込む手段と、前記エンジ
ンの負荷の大きさを検出する手段よりエンジンの負荷の
大きさを読み込む手段と、読み込まれたエンジン回転数
と負荷の大きさよりエンジンが過負荷状態にあるか否か
を判定する手段と、エンジンが過負荷状態であると判定
された場合に前記エンジン負荷を低減する手段に対して
負荷を低減させる信号を出力する手段とを設けた。
Means for Solving the Problems Means for detecting the engine speed, means for detecting the magnitude of the load on the engine,
A means for reducing the engine load and a controller, the means for reading the engine speed from the means for detecting the engine speed in the controller, and the means for detecting the magnitude of the load on the engine. A means for further reading the magnitude of the load of the engine, a means for judging whether or not the engine is in the overload state based on the read engine speed and the magnitude of the load, and it is determined that the engine is in the overload state. In this case, means for outputting a signal for reducing the load is provided to the means for reducing the engine load.

【0005】[0005]

【実施例】本発明の実施例を図面に基づいて説明する。
図1は、本発明の一実施例の構成を説明する図である。
1はエンジン、2はエンジンガバナ(図示せず)のコン
トロ−ルラック位置を検出するラックセンサであり、エ
ンジン負荷が増すほどその出力信号Raは増加あるいは
減少する傾向にあり、エンジンの負荷の大きさを検出す
る手段として機能する。3はエンジン負荷となる可変容
量ポンプであり、4は可変容量ポンプ3の斜板を操作す
ることにより可変容量ポンプ3のポンプ馬力を制御する
レギュレ−タであり、電磁比例減圧弁5の二次圧Pzを
入力信号としている。6は電磁比例弁コントロ−ラであ
り、コントロ−ラ7の指令電圧Vに応じて電磁比例減圧
弁5へ制御電流Isol を出力する。レギュレ−タ4、電
磁比例減圧弁5及び電磁比例弁コントロ−ラ6によりエ
ンジン負荷を低減する手段を構成する。8はエンジン回
転センサであり、エンジン回転数を検出する手段として
機能する。エンジン回転センサ8は、検出したエンジン
回転数をエンジン回転数検出信号NE として、コントロ
−ラ7に出力する。
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining the configuration of an embodiment of the present invention.
Reference numeral 1 is an engine, 2 is a rack sensor for detecting a control rack position of an engine governor (not shown), and the output signal Ra thereof tends to increase or decrease as the engine load increases. Function as a means for detecting. Reference numeral 3 is a variable displacement pump serving as an engine load, 4 is a regulator for controlling the pump horsepower of the variable displacement pump 3 by operating a swash plate of the variable displacement pump 3, and a secondary of the electromagnetic proportional pressure reducing valve 5. The pressure Pz is used as an input signal. Reference numeral 6 denotes an electromagnetic proportional valve controller, which outputs a control current Isol to the electromagnetic proportional pressure reducing valve 5 in accordance with a command voltage V of the controller 7. The regulator 4, the electromagnetic proportional pressure reducing valve 5, and the electromagnetic proportional valve controller 6 constitute means for reducing the engine load. Reference numeral 8 denotes an engine rotation sensor, which functions as a means for detecting the engine speed. The engine speed sensor 8 outputs the detected engine speed as an engine speed detection signal NE to the controller 7.

【0006】次に図2のフロ−チャ−トで、コントロ−
ラ7としてマイクロコンピュ−タを搭載した場合につい
て処理の流れを説明する。まずステップ1でエンジン回
転センサ8で検出されたエンジン回転信号NEをコント
ロ−ラ7で読み込む。ステップ2でエンジン回転信号N
Eに基づき、フルラック位置Ra Fullを算出する。なお
NEとRa Fullの関係は図3に示すようになっている。
またフルラック位置とはエンジン負荷が100%以上の
状態(過負荷状態)を示すものである。
Next, in the flow chart of FIG.
The flow of processing will be described for the case where a microcomputer is installed as the printer 7. First, in step 1, the engine rotation signal NE detected by the engine rotation sensor 8 is read by the controller 7. In step 2, the engine rotation signal N
Based on E, the full rack position Ra Full is calculated. The relationship between NE and Ra Full is shown in FIG.
The full rack position means a state where the engine load is 100% or more (overload state).

【0007】ステップ3でラックセンサ2により検出さ
れたラック位置Raをコントロ−ラ7に読み込む。そし
て、ステップ4でRa FullとRaを比較し、Ra≧Ra
Fullならばステップ5へ進み、Ra<Ra Fullならば
ステップ1へ戻る。
In step 3, the rack position Ra detected by the rack sensor 2 is read into the controller 7. Then, in step 4, Ra Full and Ra are compared, and Ra ≧ Ra
If it is Full, proceed to Step 5, and if Ra <Ra Full, return to Step 1.

【0008】ステップ5で電磁比例減圧弁5からレギュ
レ−タ4への入力信号Pzの値を△Pだけ増す。即ち、
Pz=Pz+△Pとする。なお、Pzとポンプ馬力の関係
は図4に示すようになっており、Pzが大きくなるほど
ポンプ馬力は小さくなって行く。
In step 5, the value of the input signal Pz from the electromagnetic proportional pressure reducing valve 5 to the regulator 4 is increased by ΔP. That is,
Let Pz = Pz + ΔP. The relationship between Pz and pump horsepower is as shown in FIG. 4, and the pump horsepower decreases as Pz increases.

【0009】ステップ6でPzを電圧信号Vに変換し、
電磁比例弁コントロ−ラ6に出力し、ステップ1へ戻
る。電磁比例弁コントロ−ラ6は指令電圧Vを受けて電
磁比例減圧弁5に制御電流Isol を出力する。制御電流
Isol に応じて、電磁比例減圧弁5の二次圧がPz=Pz
+△Pとなり、ポンプ馬力は低下する(図4参照)。
In step 6, Pz is converted into a voltage signal V,
Output to the solenoid proportional valve controller 6 and return to step 1. The solenoid proportional valve controller 6 receives the command voltage V and outputs a control current Isol to the solenoid proportional pressure reducing valve 5. According to the control current Isol, the secondary pressure of the electromagnetic proportional pressure reducing valve 5 is Pz = Pz.
It becomes + ΔP and the pump horsepower decreases (see FIG. 4).

【0010】[0010]

【発明の効果】このようにエンジンの負荷の大きさを検
出する手段によりエンジン過負荷(負荷率100%以
上)状態を判定し、過負荷時にはポンプ馬力を下げる、
即ちエンジン負荷を瞬時のうちに下げるのでエンストを
未然に防止することができる。
As described above, the state of engine overload (load factor of 100% or more) is determined by the means for detecting the magnitude of the load on the engine, and the pump horsepower is reduced when the engine is overloaded.
That is, the engine load is reduced in an instant, so engine stalling can be prevented.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例の構成を説明する図。FIG. 1 is a diagram illustrating a configuration of an embodiment of the present invention.

【図2】本発明の処理の流れを説明するフロ−チャ−
ト。
FIG. 2 is a flowchart for explaining the processing flow of the present invention.
To.

【図3】エンジン回転信号NEとフルラック位置Ra Fu
llとの関係を示すグラフ。
[Fig. 3] Engine rotation signal NE and full rack position Ra Fu
A graph showing the relationship with ll.

【図4】電磁比例減圧弁Pzとポンプ馬力との関係を示
すグラフ。
FIG. 4 is a graph showing a relationship between an electromagnetic proportional pressure reducing valve Pz and pump horsepower.

【符号の説明】[Explanation of symbols]

1 エンジン 2 ラックセンサ 3 可容量ポンプ 4 レギュレ−タ 5 電磁比例減圧弁 6 電磁比例弁コン
トロ−ラ 7 コントロ−ラ 8 エンジン回転セ
ンサ
1 engine 2 rack sensor 3 capacity pump 4 regulator 5 electromagnetic proportional pressure reducing valve 6 electromagnetic proportional valve controller 7 controller 8 engine rotation sensor

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 エンジン回転数を検出する手段と、エン
ジンの負荷の大きさを検出する手段と、エンジン負荷を
低減する手段と、コントロ−ラとを有し、該コントロ−
ラに、 前記エンジン回転数を検出する手段よりエンジン回転数
を読み込む手段と、前記エンジンの負荷の大きさを検出
する手段よりエンジンの負荷の大きさを読み込む手段
と、読み込まれたエンジン回転数と負荷の大きさよりエ
ンジンが過負荷状態にあるか否かを判定する手段と、エ
ンジンが過負荷状態であると判定された場合に前記エン
ジン負荷を低減する手段に対して負荷を低減させる信号
を出力する手段とを設けたことを特徴とするエンジン停
止防止装置。
1. An engine rotational speed detection means, an engine load magnitude detection means, an engine load reduction means, and a controller, the controller comprising:
A means for reading the engine speed from the means for detecting the engine speed, a means for reading the magnitude of the engine load from the means for detecting the magnitude of the engine load, and a read engine speed. Outputting a signal for reducing the load to the means for determining whether the engine is overloaded based on the magnitude of the load and the means for reducing the engine load when it is determined that the engine is overloaded An engine stop prevention device, which is provided with:
【請求項2】 可変容量ポンプを負荷とするエンジンに
おいて、該エンジンの回転数を検出するエンジン回転セ
ンサと、該エンジンのエンジンガバナのコントロ−ルラ
ック位置(Ra)を検出するラックセンサと、前記可変容
量ポンプの斜板を電磁比例減圧弁の二次圧(Pz)に応じ
て操作してポンプ馬力を制御するレギュレ−タと、コン
トロ−ラの指令電圧(V)に応じて前記電磁比例減圧弁に
制御電流(Isol)を出力する電磁比例弁コントロ−ラと
からなり、前記コントロ−ラに、 前記エンジン回転センサよりエンジン回転数(NE)を読
み込む手段と、前記ラックセンサよりラック位置(Ra)
を読み込む手段と、読み込まれたエンジン回転数(NE)
に基づいてフルラック位置(Ra Full)を算出する手段
と、この算出したフルラック位置(Ra Full)と読み込
んだラック位置(Ra)とを比較する手段と、ラック位置
(Ra)がフルラック位置(Ra Full)以上の場合に前記
電磁比例減圧弁の二次圧(Pz)の値を△Pだけ増加する
手段と、△Pだけ増加した二次圧(Pz)を電圧信号(V)
に変換し、前記電磁比例コントロ−ラに指令電圧として
出力する手段とを設けたことを特徴とするエンジン停止
防止装置。
2. In an engine having a variable displacement pump as a load, an engine rotation sensor for detecting a rotational speed of the engine, a rack sensor for detecting a control rack position (Ra) of an engine governor of the engine, and the variable. A regulator that controls the pump horsepower by operating the swash plate of the capacity pump according to the secondary pressure (Pz) of the electromagnetic proportional pressure reducing valve, and the electromagnetic proportional pressure reducing valve according to the command voltage (V) of the controller. And a means for reading the engine speed (NE) from the engine speed sensor, and a rack position (Ra) from the rack sensor.
And the engine speed (NE) that was read
Means for calculating the full rack position (Ra Full) based on the above, means for comparing the calculated full rack position (Ra Full) with the read rack position (Ra), and rack position
When (Ra) is at or above the full rack position (Ra Full), means for increasing the secondary pressure (Pz) of the solenoid proportional pressure reducing valve by ΔP and secondary pressure (Pz) increased by ΔP are provided. Voltage signal (V)
And a means for converting into the electromagnetic proportional controller and outputting it as a command voltage to the electromagnetic proportional controller.
JP725795A 1995-01-20 1995-01-20 Engine stop preventing device Pending JPH08200138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP725795A JPH08200138A (en) 1995-01-20 1995-01-20 Engine stop preventing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP725795A JPH08200138A (en) 1995-01-20 1995-01-20 Engine stop preventing device

Publications (1)

Publication Number Publication Date
JPH08200138A true JPH08200138A (en) 1996-08-06

Family

ID=11660983

Family Applications (1)

Application Number Title Priority Date Filing Date
JP725795A Pending JPH08200138A (en) 1995-01-20 1995-01-20 Engine stop preventing device

Country Status (1)

Country Link
JP (1) JPH08200138A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140158671A1 (en) * 2007-04-30 2014-06-12 Illinois Tool Works Inc. Engine-driven air compressor/generator load priority control system and method
CN106168173A (en) * 2016-08-30 2016-11-30 潍柴动力股份有限公司 A kind of engine control strategy

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140158671A1 (en) * 2007-04-30 2014-06-12 Illinois Tool Works Inc. Engine-driven air compressor/generator load priority control system and method
US11484959B2 (en) * 2007-04-30 2022-11-01 Illinois Tool Works Inc. Engine-driven air compressor/generator load priority control system and method
CN106168173A (en) * 2016-08-30 2016-11-30 潍柴动力股份有限公司 A kind of engine control strategy

Similar Documents

Publication Publication Date Title
KR101637571B1 (en) Hydraulic pump control apparatus and control method for construction machinery
JP3641504B2 (en) Hydraulic transmission motor, overspeed control device, and variable displacement hydraulic motor control method
KR20040007574A (en) Method and device for controlling an electrically driven charger
KR930010392A (en) Discharge flow rate control device of hydraulic pump
US6648303B1 (en) Control device for hydraulic drive winch
JPH11166482A (en) Hydraulic transmission of hydraulic working machine
JP2511925B2 (en) Construction machine engine speed control device
JP2001107903A (en) Control method and device for by-pass valve of fluid circuit
US5682855A (en) Method for controlling RPM of engine in hydraulic construction machine
JP2000154803A (en) Engine lag-down prevention device for hydraulic construction machine
JPH08200138A (en) Engine stop preventing device
US5875762A (en) Engine controller
JP3535701B2 (en) Control device for hydraulic motor
JPH09273183A (en) Revolution number controller of engine for hydraulic construction machine
JP2000161302A (en) Engine lug-down prevention device for hydraulic construction machine
JP2005061298A (en) Construction machine
JPH05215101A (en) Control method of pump inclination quantity
JP3039614B2 (en) Rack sensor abnormality detection device for detecting engine load factor in crane
JP3787909B2 (en) Actuator control device
JPH09242708A (en) Speed control device of hydraulic actuator
JP2553978Y2 (en) Control device for prime mover and hydraulic circuit of construction machinery
JP2821339B2 (en) Control device of construction machine with attachment
JPH03253787A (en) Output electronic control device for hydraulic pump
KR920010084A (en) Optimum working flow control device of excavator and its control method
JP2571982Y2 (en) Construction machine control circuit