JPH086632B2 - Engine control method - Google Patents
Engine control methodInfo
- Publication number
- JPH086632B2 JPH086632B2 JP24012086A JP24012086A JPH086632B2 JP H086632 B2 JPH086632 B2 JP H086632B2 JP 24012086 A JP24012086 A JP 24012086A JP 24012086 A JP24012086 A JP 24012086A JP H086632 B2 JPH086632 B2 JP H086632B2
- Authority
- JP
- Japan
- Prior art keywords
- rotation
- over
- rotation speed
- engine
- time
- 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 - Fee Related
Links
- 238000000034 method Methods 0.000 title claims description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Combined Controls Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明の制御方法は自動車，作業車両その他各種機械
類の動力装置として用いられているエンジンの過回転防
止に利用される。Description: INDUSTRIAL APPLICABILITY The control method of the present invention is used to prevent over-rotation of an engine used as a power unit for automobiles, work vehicles and various other machines.
従来の技術 エンジンの回転速度を制御する手段として機械式また
は空気式のガバナが広く知られており，回転速度を或る
最高値以下に制御して過回転によるエンジンの破損を防
止するものである。また，回転速度が或る最高値を超え
たときバツテリからの電力供給を停止しエンジンを停止
させることも例えば特公昭56−13178号公報に開示され
ている。2. Description of the Related Art A mechanical or pneumatic governor is widely known as a means for controlling the rotation speed of an engine, and controls the rotation speed below a certain maximum value to prevent damage to the engine due to excessive rotation. . It is also disclosed, for example, in Japanese Patent Publication No. 56-13178, that the power supply from the battery is stopped and the engine is stopped when the rotation speed exceeds a certain maximum value.
発明が解決しようとする問題点 しかしながら，前記従来の手段はいずれも予め設定さ
れた或る最高値を超えたとき回転速度を低下させるよう
にガバナ装置が働くものであり，エンジンを最高値近く
の回転速度で運転する場合など過回転となるごとに働く
ため回転速度を却つて不安定にすることがあるという問
題を生じる。一方，ごく短時間の過回転ではエンジンや
アクチユエータに耐久性を劣化させるほどの悪影響はな
く，またそのまま放置しても最高値以下に短時間で回転
低下しガバナ装置を働かせる必要はない。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in any of the above-mentioned conventional means, the governor device works so as to reduce the rotation speed when a preset maximum value is exceeded. This causes a problem that the rotation speed may be rather unstable because it works at every rotation speed such as when operating at the rotation speed. On the other hand, overrotation for a very short time has no adverse effect on the engine or actuator, which deteriorates the durability, and even if it is left as it is, it is not necessary to operate the governor device because the rotation speed drops below the maximum value in a short time.
そこで本発明は短時間の過回転では回転低下手段を働
かせることがなく，従つて回転速度の不安定化を招かな
い制御方法を提供することを目的として発明されたもの
である。Therefore, the present invention has been invented for the purpose of providing a control method in which the rotation lowering means is not operated even when the rotation speed is excessive and the rotation speed is not destabilized.
問題点を解決するための手段 本発明は，過回転判定レベルを或う回転速度に設定す
るとともに，過回転の大きさに応じた過回転許容時間を
設定し，エンジンの回転速度が過回転判定レベルを超え
たときその回転速度差に応じた過回転許容時間以上過回
転が続いた場合に回転低下手段を働かせる構成としたこ
とにより前記問題点を解決するための手段とした。Means for Solving Problems According to the present invention, the overspeed determination level is set to a certain rotation speed, and the overspeed allowable time is set according to the magnitude of the overspeed so that the engine rotation speed is determined to be the overspeed determination. When the level is exceeded, the rotation lowering means is operated when the over-rotation continues for the over-rotation permissible time corresponding to the difference in the rotational speed, whereby the above-mentioned problems are solved.
作用 正常運転されているエンジンが何等かの原因で予め設
定された最高値である過回転判定レベルを超えた過回転
状態となつたとき，過回転の大きさ即ちエンジン回転速
度と判定レベル回転速度との差に応じて予め設定されて
いる過回転許容時間内で過回転判定レベル以下に回転速
度が低下したときは，一時的な過回転と考えて回転低下
手段を働かせない。過回転許容時間を経過してとき依然
として過回転が続いているときは危険と考えて回転低下
手段を働かせる。Action When the engine that is operating normally is in an over-rotation state that exceeds the preset maximum value of over-rotation determination level for some reason, the magnitude of over-rotation, that is, the engine rotation speed and the determination level rotation speed If the rotation speed falls below the over-rotation determination level within the preset allowable over-rotation time depending on the difference between the above and the above, the rotation lowering means is not operated because it is considered as temporary over-rotation. When the over-rotation allowable time has elapsed and when the over-rotation continues, it is considered dangerous and the rotation lowering means is activated.
発明の効果 本発明によると，エンジンが過回転となつたとき，こ
の大きさに応じて設定した許容時間内に回転速度が低下
したときは回転低下手段を働かせないので，ごく短時間
の過回転を発生してもその都度回転速度を強制的に低下
させ却つて不安定にするという不都合がなくなるのであ
る。また，許容時間を超えて過回転が続くときに回転低
下手段が働くので，エンジンやその周辺機器の不調，故
障による過回転に対して従来通りの安全を計ることがで
きるものである。EFFECTS OF THE INVENTION According to the present invention, when the engine becomes over-rotated, the rotation lowering means is not activated when the rotation speed is reduced within the permissible time set according to this magnitude. Even if occurs, the inconvenience of forcibly decreasing the rotation speed each time and becoming unstable is eliminated. Further, when the excessive rotation continues beyond the allowable time, the rotation lowering means works, so that it is possible to maintain the conventional safety against the excessive rotation due to the malfunction or failure of the engine and its peripheral equipment.
実 施 例 第１図は本発明を実施する一つのシステム図であつ
て，エンジンの回転速度を検知する回転センサ１および
吸気路の絞り弁開度を検知する位置センサ2,更にエンジ
ンの電子制御システムにおいて一般に用いられている各
種センサからの電気信号が電子式の制御装置３に入力さ
れ，また点火コイル4,燃料噴射弁5,絞り弁アクチユエー
タ６およびその他のエンジン制御のためのアクチユエー
タに制御装置３から駆動信号が出力されるようになつて
いる。Practical Example FIG. 1 is a system diagram for carrying out the present invention. A rotation sensor 1 for detecting an engine speed, a position sensor 2 for detecting a throttle valve opening of an intake passage, and an electronic control of the engine. Electric signals from various sensors generally used in the system are input to an electronic control unit 3, and an ignition coil 4, a fuel injection valve 5, a throttle valve actuator 6 and other actuators for controlling the engine are also controlled. The drive signal is output from the device 3.
制御装置３には，エンジンの或る回転速度を最高値に
設定し過回転判定レベルとして予め記憶させてあるとと
もに，この過回転判定レベルを超えたときのエンジン回
転速度と判定レベル回転速度との回転速度差に応じた過
回転許容時間を設定して同じく記憶させてある。The control device 3 sets a certain rotation speed of the engine to the maximum value and stores it in advance as an overspeed determination level. The engine speed and the determination level rotation speed when the overspeed determination level is exceeded are also stored. The allowable over-rotation time is set according to the rotation speed difference and is also stored.
回転センサ１からの電気信号によつて回転速度が過回
転判定レベルを超えたことが検知されたとき，回転速度
に応じた過回転許容時間を経過した場合にバツテリ７か
ら制御装置３およびエンジン運転に必要な個所へ至る電
源線８に設けたリレースイツチ９に通電して電源線８を
開き，これによつてエンジンおよびその周辺への電力供
給を全て遮断する。このため点火コイル４と燃料噴射弁
５とが停止してエンジンは回転速度を低下し，過回転判
定レベルよりも低回転となつたとき運転を再開するかま
たは停止に至らせる。従つて，この実施例では点火コイ
ル4,燃料噴射弁５への通電停止が回転低下手段となる。When it is detected by the electric signal from the rotation sensor 1 that the rotation speed exceeds the overspeed determination level, when the overspeed allowable time corresponding to the rotation speed elapses, the battery 7 causes the controller 3 and the engine to operate. The relay switch 9 provided on the power supply line 8 reaching the necessary position is energized to open the power supply line 8 and thereby shut off all power supply to the engine and its surroundings. For this reason, the ignition coil 4 and the fuel injection valve 5 are stopped, the engine speed is reduced, and when the engine speed is lower than the overspeed determination level, the operation is restarted or stopped. Therefore, in this embodiment, stopping the energization of the ignition coil 4 and the fuel injection valve 5 serves as the rotation lowering means.
回転低下手段を働かせるか否かの判断は前記のように
回転速度差と過回転許容時間とに基いて行なわれる。即
ち，第２図において或る時刻T0で回転速度Ｎが曲線Ａの
ように過回転判定レベルNoを超えたとき,N＝N0＝△Ｎで
表わされる過回転の大きさ即ち回転速度差を時刻T0から
の時間ｔで積分し，その値が或る所定値を超えたとき回
転低下手段を働かせ，曲線Ｂのように回転速度ＮをN0以
下に低下させる。従つて，前記の或る所定値に達しない
うちに回転速度Ｎが曲線ＣのようにN0以下に低下したと
きは回転低下手段は働かない。或いは，回転速度差△Ｎ
に対する過回転許容時間Ｔのマップを第３図のように作
成しておき，例えば第２図曲線Ａのように回転速度Ｎが
変化したとき時刻回転速度差△N1,△N2に対応するT0か
らの経過時間t1,t2をマツプ上のT1,T2と比較し T0からの経過時間t1,t2をマップ上の回転速度差△N1,
△N2に対応する過回転許容時間T1,T2と比較し，△N1に
対してT1＜t1,△N2に対してT2＜t2となつたとき回転低
下手段を働かせる。Whether or not the rotation lowering means is activated is determined based on the difference in rotation speed and the permissible overspeed time as described above. That is, when the rotation speed N exceeds the over-rotation determination level No as shown by the curve A at a certain time T 0 in FIG. 2, the magnitude of the over-rotation represented by N = N 0 = ΔN, that is, the rotation speed difference. Is integrated at time t from time T 0, and when the value exceeds a certain predetermined value, the rotation reducing means is activated to decrease the rotation speed N to N 0 or less as shown by the curve B. Therefore, when the rotation speed N decreases to N 0 or less as shown by the curve C before the predetermined value is reached, the rotation decreasing means does not work. Alternatively, the rotation speed difference ΔN
A map of the permissible over-rotation time T is prepared as shown in FIG. 3, and corresponds to the time rotational speed difference ΔN 1 and ΔN 2 when the rotational speed N changes as shown by the curve A in FIG. 2, for example. T 0 time elapsed from t 1, t 2 and T 1 of the on Matsupu, T 2 compared to the elapsed time t 1, t 2 the rotation speed difference on the map from T 0 △ N 1,
△ compared overspeed permissible time corresponding to N 2 T 1, T 2 and, △ T 1 <t 1 with respect to N 1, the rotation reduction means when becomes such T 2 <t 2 with respect to △ N 2 To work.
第１図は本発明の実施例のシステム図，第２図は回転速
度の変化を説明する図，第３図は回転速度差に対する過
回転許容時間のマツプである。 １……回転センサ,2……位置センサ,3……制御装置,4…
…点火コイル,5……燃料噴射弁,8……電源線,9……リレ
ースイツチ，FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is a diagram for explaining changes in rotation speed, and FIG. 3 is a map of an allowable overspeed time with respect to a rotation speed difference. 1 ... Rotation sensor, 2 ... Position sensor, 3 ... Control device, 4 ...
… Ignition coil, 5 …… Fuel injection valve, 8 …… Power line, 9 …… Relay switch,
Claims (1)
るとともに，過回転の大きさに応じた過回転許容時間を
設定し，エンジンの回転速度が過回転判定レベルを超え
たときその回転速度差に応じた過回転許容時間以上過回
転が続いた場合に回転低下手段を働かせることを特徴と
するエンジンの制御方法。1. An over-rotation determination level is set to a certain rotation speed, and an over-rotation allowable time is set according to the magnitude of the over-rotation, and when the engine rotation speed exceeds the over-rotation determination level, the rotation A method for controlling an engine, characterized in that, when over-rotation continues for a permissible over-rotation time corresponding to a speed difference, a rotation lowering means is activated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24012086A JPH086632B2 (en) | 1986-10-08 | 1986-10-08 | Engine control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24012086A JPH086632B2 (en) | 1986-10-08 | 1986-10-08 | Engine control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6394058A JPS6394058A (en) | 1988-04-25 |
| JPH086632B2 true JPH086632B2 (en) | 1996-01-29 |
Family
ID=17054788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24012086A Expired - Fee Related JPH086632B2 (en) | 1986-10-08 | 1986-10-08 | Engine control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH086632B2 (en) |
-
1986
- 1986-10-08 JP JP24012086A patent/JPH086632B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6394058A (en) | 1988-04-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |