JPH0331550A - Revolution speed controller - Google Patents

Revolution speed controller

Info

Publication number
JPH0331550A
JPH0331550A JP16446089A JP16446089A JPH0331550A JP H0331550 A JPH0331550 A JP H0331550A JP 16446089 A JP16446089 A JP 16446089A JP 16446089 A JP16446089 A JP 16446089A JP H0331550 A JPH0331550 A JP H0331550A
Authority
JP
Japan
Prior art keywords
control
engine
signal
section
fuel
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
JP16446089A
Other languages
Japanese (ja)
Inventor
Hiroyuki Tsuda
裕之 津田
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP16446089A priority Critical patent/JPH0331550A/en
Publication of JPH0331550A publication Critical patent/JPH0331550A/en
Pending legal-status Critical Current

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  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE:To improve the starting performance of an engine and reduce the overshoot quantity in feedback control by releasing feedback control on the start of the engine and supplying fuel in a separatedly set feed quantity. CONSTITUTION:A PID control part 11 carries out PID control so that the engine revolution speed detected by a revolution speed detecting part 10 accords with the revolution speed set in a revolution speed setting part 9, and a prescribed control signal is inputted into a signal selection part 14. Further, into the signal selection part 14, also the signal corresponding to the fuel supply quantity set by a feeding quantity setting part 13 is inputted. While, the signal selection part 14 outputs one between the above-described output signals into a PWM control part 12. The PWM control part 12 outputs a drive signal having the duty ratio corresponding to the input signal into a fuel feeding part not shown on the figure. Therefore, feedback control is released on the start of the engine, and fuel is supplied with a separatedly set feed quantity.

Description

【発明の詳細な説明】 (a)産業上の利用分野 この発明は、エンジンに対する燃料供給量を変えてエン
ジン回転数を目標値に一致させるフィードバック制御を
行う回転数制御装置に関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a rotational speed control device that performs feedback control to match the engine rotational speed to a target value by changing the amount of fuel supplied to an engine.

(b)従来の技術 第3図に示すように発電機などの負荷装置2を駆動する
汎用のエンジンlでは、負荷状態に係わらず常に一定の
エンジン回転数を維持するように制御される。このため
、フライホイール3に形成されたリングギアの歯を検出
する電磁ピンクアップ4の検出パルスに基づいて回転数
検出部10でエンジン回転数を検出し、このエンジン回
転数が回転数設定部9において設定された目標回転数に
一致するようにPID制御部11によりフィードバック
制御を行う。このPID制御部11から出力された制御
信号をPWM制御部12に入力し、燃料供給部8をデユ
ーティ制御する。燃料供給部8はリニアソレノイド6を
備えており、このリニアソレノイド6はソレノイドドラ
イバ7に入力される駆動信号のデユーティ比に応じて電
子ガバナ5が有するコントロールランクを変位させる。
(b) Prior Art As shown in FIG. 3, a general-purpose engine l that drives a load device 2 such as a generator is controlled to always maintain a constant engine rotational speed regardless of the load state. Therefore, the engine rotation speed is detected by the rotation speed detection section 10 based on the detection pulse of the electromagnetic pin up 4 that detects the teeth of the ring gear formed on the flywheel 3, and this engine rotation speed is detected by the rotation speed setting section 9. Feedback control is performed by the PID control unit 11 so as to match the target rotation speed set in . The control signal output from the PID control section 11 is input to the PWM control section 12, and the fuel supply section 8 is duty-controlled. The fuel supply section 8 is equipped with a linear solenoid 6, and the linear solenoid 6 displaces the control rank of the electronic governor 5 according to the duty ratio of the drive signal input to the solenoid driver 7.

電子ガバナ5はこのコントロールラックの位置に応じた
燃料をエンジン1に供給する。
The electronic governor 5 supplies fuel to the engine 1 according to the position of this control rack.

(C)発明が解決しようとする課題 しかしながら、上記従来の回転数制御装置では、エンジ
ン始動時には回転数検出部10の検出結果が略0であり
、PWM制御部12からは略100%のデユーティ比で
駆動信号が出力される。このため、電子ガバナ5におい
てコントロールラックは最大位置まで変位し、全開状態
となる。このように、始動時において電子ガバナ5が全
開状態にされると、始動後の回転数制御において定めら
れた供給量に変えるまでに比較的長時間を必要とし、第
4図中実線で示すように大きなオーバーシュートを生じ
、制御遅れが大きくなる問題があった。また、始動時に
おいてセルモータの回転数が低い状態で多量の燃料が供
給されると、エンジンの始動性が低下し、クランキング
に長時間を必要とする問題かあった。
(C) Problems to be Solved by the Invention However, in the conventional rotation speed control device described above, when the engine is started, the detection result of the rotation speed detection section 10 is approximately 0, and the PWM control section 12 detects a duty ratio of approximately 100%. A drive signal is output. Therefore, the control rack in the electronic governor 5 is displaced to the maximum position and becomes fully open. In this way, if the electronic governor 5 is fully opened at the time of startup, it will take a relatively long time to change the supply amount to the predetermined amount in the rotation speed control after startup, as shown by the solid line in FIG. There was a problem in that a large overshoot occurred and the control delay became large. Furthermore, if a large amount of fuel is supplied at a low rotational speed of the starting motor at the time of starting, there is a problem that the startability of the engine deteriorates and cranking takes a long time.

この発明の目的は、エンジンの始動性を考慮して始動時
における燃料供給量を設定入力できるようにし、所定の
回転数に達するまではフィードバック制御を行わないよ
うにするとともに、エンジン回転数が所定の回転数に達
したときに設定回転数を目標値とするフィードバック制
御が行われるようにし、始動時の回転数制御においてオ
ーバーシュート量を小さくして制御遅れを短縮し、さら
に始動性を向上できる回転数制御装置を提供することに
ある。
An object of the present invention is to enable setting and input of the amount of fuel supplied at the time of starting, taking engine startability into consideration, and to prevent feedback control from being performed until the engine speed reaches a predetermined speed. Feedback control is performed using the set rotation speed as the target value when the rotation speed reaches the set rotation speed, reducing the amount of overshoot in rotation speed control at startup, shortening control delay, and further improving startability. An object of the present invention is to provide a rotation speed control device.

(d)課題を解決するための手段 この発明の回転数制御装置は、予め設定されたエンジン
回転数を目標値とするフィードバック制御を行う制御部
と、エンジンに対する燃料供給量を設定入力する供給量
設定部と、エンジン始動後にエンジン回転数が所定の制
御移行回転数を上回った際に燃料供給部に対する制御信
号として供給量設定部の出力から制御部の出力に切り換
える切換手段と、を設けたことを特徴とする。
(d) Means for Solving the Problems The rotational speed control device of the present invention includes a control section that performs feedback control using a preset engine rotational speed as a target value, and a supply amount that inputs and sets the amount of fuel supplied to the engine. A setting section and a switching means for switching from the output of the supply amount setting section to the output of the control section as a control signal to the fuel supply section when the engine speed exceeds a predetermined control transition speed after engine startup. It is characterized by

(e)作用 この発明においては、エンジンの始動時には供給量設定
部において設定入力された供給■で燃料が供給され、エ
ンジン回転数が所定の制御移行回転数を上回った際にエ
ンジン回転数を目標値とするフィードバンク制御が行わ
れる。したがって、供給量設定部において始動性を考慮
して全開状態以下の燃料供給量を設定すると、エンジン
の始動性が向上するとともに、フィードバック制御によ
り定められた燃料供給量まで変えるための時間を短縮で
き、移行回転数を上回った後に制御のオーバーシュート
量を小さくできる。
(e) Effect In this invention, when the engine is started, fuel is supplied at the supply rate set and input in the supply amount setting section, and when the engine speed exceeds a predetermined control transition speed, the engine speed is set to the target speed. Feed bank control is performed to make the value the value. Therefore, by setting the fuel supply amount below the fully-open state in consideration of startability in the supply amount setting section, the startability of the engine will be improved, and the time required to change the fuel supply amount to the predetermined fuel amount using feedback control can be shortened. , the amount of control overshoot can be reduced after the transition speed has been exceeded.

(f)実施例 第1図は、この発明の実施例である回転数制御Vt置の
構成を示すブロック図である。
(f) Embodiment FIG. 1 is a block diagram showing the configuration of a rotation speed control Vt position according to an embodiment of the present invention.

PID制御部11は回転数検出部10が検出したエンジ
ン回転数が、回転数設定部9において予め設定された設
定回転数に一致するようにPID制御を行い、制御信号
を信号切換部14に入力する。また、この信号切換部1
4には、供給量設定部13において設定された燃料供給
量に応じた供給量信号も入力される。信号切換部14に
は回転数検出部lOが検出したエンジン回転数が入力さ
れ、信号切換部14はこのエンジン回転数に応じてPI
D制御部tiから出力された制御信号または供給量設定
部13から入力された供給量信号の何れかをPWM制御
部12に出力する。PWM制御部12は入力された信号
に応じたデユーティ比で駆動信号を第3図に示す燃料供
給部8に出力する。
The PID control section 11 performs PID control so that the engine rotation speed detected by the rotation speed detection section 10 matches the set rotation speed preset in the rotation speed setting section 9, and inputs a control signal to the signal switching section 14. do. In addition, this signal switching section 1
4, a supply amount signal corresponding to the fuel supply amount set in the supply amount setting section 13 is also input. The engine rotation speed detected by the rotation speed detection unit IO is input to the signal switching unit 14, and the signal switching unit 14 changes the PI according to this engine rotation speed.
Either the control signal output from the D control section ti or the supply amount signal input from the supply amount setting section 13 is output to the PWM control section 12 . The PWM control section 12 outputs a drive signal to the fuel supply section 8 shown in FIG. 3 at a duty ratio according to the input signal.

第2図は、上記回転数制御装置の一部を構成する信号切
換部の回路図である。
FIG. 2 is a circuit diagram of a signal switching unit that constitutes a part of the rotation speed control device.

信号切換部14は、コンパレータCMP 1および切換
スイッチSWIにより構成されている。コンパレータC
MP 1の非反転入力端子には回転数検出部lOの出力
である回転数信号が入力され、反転入力端子にはボリュ
ームVRIにおいて設定された制御移行回転数の回転数
信号が入力される。したがって、エンジン回転数が制御
移行回転数を越えると、コンパレータCMP 1の出力
がHi11になる。
The signal switching unit 14 includes a comparator CMP 1 and a changeover switch SWI. Comparator C
The rotational speed signal which is the output of the rotational speed detection unit IO is inputted to the non-inverting input terminal of MP 1, and the rotational speed signal of the control transfer rotational speed set in the volume VRI is inputted to the inverting input terminal. Therefore, when the engine speed exceeds the control transition speed, the output of the comparator CMP1 becomes Hi11.

切換スイッチSWIはリレー、アナログスイッヂまたは
スイッチングトランジスタなどにより構成されており、
P[D制御部9の出力信号または供給量設定部13を構
成するボリュームVR2の何れかを択一的にPWM制御
部12に接続する。
The changeover switch SWI consists of a relay, analog switch, switching transistor, etc.
Either the output signal of the P[D control section 9 or the volume VR2 constituting the supply amount setting section 13 is selectively connected to the PWM control section 12.

この切換スイッチSWIは、コンパレータCMPlの出
力が”Lo″の状態ではボリュームVR2をPWM制御
部12に接続し、コンパレータCMPlの出力が“Hi
”になったときPID制御部9をI)WM制御部12に
接続する。したがって、エンジン回転数がボリュームV
RIによって設定された制御移行回転数に達するまでは
、ボリュームVR2によって設定された燃料供給量を実
現するように駆動信号が燃料供給部8 (第3図参照)
に出力される。一方、エンジンの回転数が制御移行回転
数を上回ると、回転数設定部9において設定された設定
回転数を目標値とするPID制御がなされ、この制御信
号に応じたデユーティ比の駆動信号が燃料供給部8に出
力される。
This changeover switch SWI connects the volume VR2 to the PWM control unit 12 when the output of the comparator CMPL is "Lo", and connects the volume VR2 to the PWM control unit 12 when the output of the comparator CMPL is "Hi".
”, the PID control section 9 is connected to the WM control section 12. Therefore, the engine rotation speed becomes equal to the volume V.
Until the control transition speed set by RI is reached, the drive signal is applied to the fuel supply section 8 to achieve the fuel supply amount set by the volume VR2 (see Fig. 3).
is output to. On the other hand, when the engine speed exceeds the control transition speed, PID control is performed with the set speed set in the speed setting section 9 as the target value, and a drive signal with a duty ratio corresponding to this control signal is It is output to the supply section 8.

以上の構成により、供給量設定部13において始動性を
考慮した燃料供給量を設定しておくと、始動時にはこの
燃料供給量を実現するように燃料供給装置8が駆動され
る。一般に、始動性を良好にするためには、燃料の供給
量を全開状態よりも少なくする必要がある。このように
、始動時に全開状態よりも少ない量の燃料が供給されて
いる状態であると、エンジンの回転数が制御移行回転数
に達したのちにPID制御により定められた供給量に変
えるまでの時間を短くすることができ、第4図中破線で
示すようにPID制御におけるオーバーシュート量を小
さくできる。
With the above configuration, if a fuel supply amount is set in consideration of startability in the supply amount setting section 13, the fuel supply device 8 is driven to realize this fuel supply amount at the time of starting. Generally, in order to improve startability, it is necessary to supply less fuel than when the engine is fully open. In this way, if a smaller amount of fuel is supplied than in the fully-open state at the time of starting, the amount of fuel required to change to the supply amount determined by PID control after the engine speed reaches the control transition speed is The time can be shortened, and the amount of overshoot in PID control can be reduced as shown by the broken line in FIG.

(g1発明の効果 この発明によれば、エンジン始動時にフィードバック制
御を解除して別に設定された供給量で燃料を供給するこ
とができ、エンジンの始動性を向上できるとともに、フ
ィードバンク制御におけるオーバシュートff1−を小
さくでき、制御遅れを短くできる利点がある。
(g1 Effect of the invention According to this invention, when starting the engine, feedback control can be canceled and fuel can be supplied at a separately set supply amount, improving engine startability and preventing overshoot in feed bank control. There is an advantage that ff1- can be made small and control delay can be shortened.

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

第1図はこの発明の実施例である回転数制御装置の構成
を示すブロック図、第2図は同回転数制御装置の要部を
構成する信号切換部の回路図である。また、第3図は従
来の回転数制御装置の構成を示す図であり、第4図はこ
の発明の回転数制御装置と従来の回転数詞?11装置と
におけるエンジン始動時の回転数の変化を示す図である
。 l−エンジン、8−燃料供給装置、 9−回転数設定部、1l−PID制御部、13−供給量
設定部、14−信号切換部。
FIG. 1 is a block diagram showing the configuration of a rotation speed control device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a signal switching section that constitutes a main part of the rotation speed control device. Further, FIG. 3 is a diagram showing the configuration of a conventional rotation speed control device, and FIG. 4 shows the rotation speed control device of the present invention and a conventional rotation speed control device. 11 is a diagram showing changes in the rotational speed at the time of engine starting in the No. 11 device. FIG. 1-engine, 8-fuel supply device, 9-rotation speed setting section, 1l-PID control section, 13-supply amount setting section, 14-signal switching section.

Claims (1)

【特許請求の範囲】[Claims] (1)予め設定されたエンジン回転数を目標値とするフ
ィードバック制御を行う制御部と、エンジンに対する燃
料供給量を設定入力する供給量設定部と、エンジン始動
後にエンジン回転数が所定の制御移行回転数を上回った
際に燃料供給部に対する制御信号として供給量設定部の
出力から制御部の出力に切り換える切換手段と、を設け
たことを特徴とする回転数制御装置。
(1) A control section that performs feedback control with a preset engine speed as a target value, a supply amount setting section that inputs and sets the amount of fuel supplied to the engine, and a rotation speed at which the engine speed changes to a predetermined control transition after the engine is started. 1. A rotation speed control device comprising: switching means for switching from the output of the supply amount setting section to the output of the control section as a control signal to the fuel supply section when the number exceeds the number of rotations.
JP16446089A 1989-06-27 1989-06-27 Revolution speed controller Pending JPH0331550A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16446089A JPH0331550A (en) 1989-06-27 1989-06-27 Revolution speed controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16446089A JPH0331550A (en) 1989-06-27 1989-06-27 Revolution speed controller

Publications (1)

Publication Number Publication Date
JPH0331550A true JPH0331550A (en) 1991-02-12

Family

ID=15793596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16446089A Pending JPH0331550A (en) 1989-06-27 1989-06-27 Revolution speed controller

Country Status (1)

Country Link
JP (1) JPH0331550A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6192847B1 (en) 1999-06-24 2001-02-27 Ford Global Technologies, Inc. Method and apparatus for selectively controlling the speed of an engine
KR100460897B1 (en) * 2002-08-23 2004-12-09 현대자동차주식회사 Method of maintaining stability and protecting rpm drop for idling for vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6357846A (en) * 1986-08-29 1988-03-12 Isuzu Motors Ltd Fast idle controller in vehicle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6357846A (en) * 1986-08-29 1988-03-12 Isuzu Motors Ltd Fast idle controller in vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6192847B1 (en) 1999-06-24 2001-02-27 Ford Global Technologies, Inc. Method and apparatus for selectively controlling the speed of an engine
KR100460897B1 (en) * 2002-08-23 2004-12-09 현대자동차주식회사 Method of maintaining stability and protecting rpm drop for idling for vehicle

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