JPS5924945U

JPS5924945U - Fuel cut device for internal combustion engine

Info

Publication number: JPS5924945U
Application number: JP11948382U
Authority: JP
Inventors: 博信小野
Original assignee: トヨタ自動車株式会社
Priority date: 1982-08-06
Filing date: 1982-08-06
Publication date: 1984-02-16
Also published as: JPH0318676Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は、従来の減速時用燃料カット回路の１例の構成
を示すブロック線図、第２図は、第１図に示した従来例
における、減速時のエンジン回転速度及びスロットル全
閉信号と燃料カット制御出力の関係の例を示す線図、第
３図は、従来の減速時用燃料カット回路の他の例の構成
を示すブロック線図、第４図は、第３図に示した従来例
における、減速時のエンジン回転速度及びスロットル全
閉信号と燃料カット制御出力の関係の例を示す線区、第
５図は、従来の減速時用燃料カット回路の更に他の構成
を示すブロック線図、第６図は、第５図に示した従来例
における、減速時のエンジン回転速度及びスロットル全
閉信号と燃料カット制御出力の関係の例を示す線図、第
７図は、本考案に係る内燃機関の燃料カット装置の第１
実施例の構成を示す回路図、第８図は、前記第１実施例
における、エンジンオーバーラン時及び減速時の、　　
　　−エンジン回転速度及びスロットル全閉信号と燃料
カット制御出力の関係の例を示す線図、第９図は、本考
案に係る内燃機関の燃料カット装置の第２実施例の構成
を示す回路図、第１０図は、前記第２実施例における、
点火１゛次信号、分周回路出力の１回転信号、基準電圧
、積分回路出力の電圧信号及びフリップフロップ回路出
力の関係の１例を示す線図である。１０・・・周波数−電圧変換器、１２・・・電圧比較器
、１４・・・ヒステリシス用抵抗、１５・・・アイドル
スイッチ、１６．２２・・・ＡＮＤ回路、１８・・・基
準電圧変更回路、２０・・・バッテリ、２４・・・ＯＲ
回路、３０・・・分周回路、３２・・・積分回路、３４
・・・フリップフロップ回路。第５１　　　　　　゛、謳υＩ４土丁第７図Fig. 1 is a block diagram showing the configuration of an example of a conventional fuel cut circuit for deceleration, and Fig. 2 shows the engine rotation speed and throttle fully closed signal during deceleration in the conventional example shown in Fig. 1. FIG. 3 is a block diagram showing the configuration of another example of the conventional fuel cut circuit for deceleration, and FIG. 4 is a diagram showing an example of the relationship between A line section showing an example of the relationship between the engine rotational speed during deceleration, the throttle fully closed signal, and the fuel cut control output in a conventional example. FIG. 5 is a block diagram showing still another configuration of the conventional fuel cut circuit for deceleration. 6 is a diagram showing an example of the relationship between the engine rotational speed during deceleration, the throttle fully closed signal, and the fuel cut control output in the conventional example shown in FIG. 5, and FIG. A first fuel cut device for an internal combustion engine according to
FIG. 8, a circuit diagram showing the configuration of the embodiment, is a circuit diagram showing the configuration of the first embodiment during engine overrun and deceleration.
- A diagram showing an example of the relationship between the engine rotation speed, the throttle fully closed signal, and the fuel cut control output; FIG. 9 is a circuit diagram showing the configuration of a second embodiment of the fuel cut device for an internal combustion engine according to the present invention; FIG. 10 shows the steps in the second embodiment.
FIG. 2 is a diagram illustrating an example of the relationship among a primary ignition signal, a one-rotation signal output from a frequency dividing circuit, a reference voltage, a voltage signal output from an integrating circuit, and an output from a flip-flop circuit. 10... Frequency-voltage converter, 12... Voltage comparator, 14... Hysteresis resistor, 15... Idle switch, 16.22... AND circuit, 18... Reference voltage changing circuit , 20...Battery, 24...OR
Circuit, 30... Frequency dividing circuit, 32... Integrating circuit, 34
...Flip-flop circuit. No. 51 ゛、謳υI4 地顶Fig. 7

Claims

[Scope of utility model registration request]

When the engine rotational speed is equal to or higher than the first judgment value and the throttle fully closed signal is on, a fuel cut is performed during deceleration, and the fuel cut is performed when the engine rotational speed is higher than the first judgment value. The throttle operation continues until the engine speed decreases by the amount of hysteresis, and furthermore, when the throttle fully closed signal is off, the determination value is raised to a second determination value higher than the normal engine speed, thereby reducing the throttle within the hysteresis. In a fuel cut device for an internal combustion engine that prevents fuel cut from being performed again even when a full close signal is turned on again, the second judgment value is set to a value suitable for preventing engine overrun. A fuel cut device for an internal combustion engine, characterized in that a fuel cut is also performed during overrun.