JPS5935671U

JPS5935671U - Air-fuel ratio control device for internal combustion engines

Info

Publication number: JPS5935671U
Application number: JP13088282U
Authority: JP
Inventors: 浅田　潔
Original assignee: トヨタ自動車株式会社
Priority date: 1982-08-30
Filing date: 1982-08-30
Publication date: 1984-03-06

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 drawings]

第１図は、従来の内燃機関の空燃比制御装置の一例の構
成を示す、一部ブロック線図を含む平面図、第２図は、
本考案に係る内燃機関の空燃比側′御装置の第１実施例
の構成を示す、一部ブロック線図を含む平面図、第３図
は、前記第１実施例における、フィードバック制御から
オープンループへの切換え時の、リニアソレノイドバル
ブ駆動電圧、エンジン回転速度、吸気管圧力及びオープ
ンループ信号の変化状態の関係の一例を示す線図、第４
図は、本考案に係る内燃機関の空燃比制御装置の第２実
施例の構成を示す、一部ブロック線図を含む平面図であ
る。１０・・・エンジン、１２・・・気化器、１８・・・酸
素濃度センサ、２４・・・空燃比制御弁、２６・・・電
子制御装置、３０・・・リッチ−リーン判定器、３２・
・・積分値設定器、３４・・・バルブ制御器、３６・・
・遅延回路、３８・・・比較器、４０・・・切換器。FIG. 1 is a plan view including a partial block diagram showing the configuration of an example of a conventional air-fuel ratio control device for an internal combustion engine, and FIG.
FIG. 3 is a plan view including a partial block diagram showing the configuration of the first embodiment of the air-fuel ratio control device for an internal combustion engine according to the present invention. Diagram 4 showing an example of the relationship between the linear solenoid valve drive voltage, engine speed, intake pipe pressure, and change state of the open loop signal when switching to
The figure is a plan view, including a partial block diagram, showing the configuration of a second embodiment of the air-fuel ratio control device for an internal combustion engine according to the present invention. DESCRIPTION OF SYMBOLS 10... Engine, 12... Carburizer, 18... Oxygen concentration sensor, 24... Air-fuel ratio control valve, 26... Electronic control device, 30... Rich-Lean determiner, 32...
... Integral value setter, 34... Valve controller, 36...
- Delay circuit, 38... comparator, 40... switch.

Claims

[Scope of utility model registration request]

(1) An air-fuel ratio sensor for detecting the exhaust air-fuel ratio, an air-fuel ratio control valve for controlling the air-fuel ratio by controlling the amount of secondary air introduced into the intake system, and during normal operation, According to the state of the air-fuel ratio determined from the air-fuel ratio sensor output, the air-fuel ratio control valve is feedback-controlled so that the air-fuel ratio becomes the target air-fuel ratio, and when a predetermined open loop condition is satisfied, In an air-fuel ratio control device for an internal combustion engine having an electronic control device, when switching from feedback control to open loop, the feedback control is stopped and switched to open loop after the delay time has elapsed. An air-fuel ratio control device for an internal combustion engine, characterized in that the air-fuel ratio is changed according to

(2) The air-fuel ratio control device for an internal combustion engine according to claim 1, wherein the delay time is changed according to the opening degree of the air-fuel ratio control valve.

(3) The air-fuel ratio control device for an internal combustion engine according to claim 1, wherein the delay time is changed according to the engine rotation speed or the traveling speed of the vehicle in which the engine is mounted.