JPS6045855U

JPS6045855U - Internal combustion engine intake secondary air supply device

Info

Publication number: JPS6045855U
Application number: JP13689183U
Authority: JP
Inventors: 谷田部　文夫; 外山　正三
Original assignee: 本田技研工業株式会社
Priority date: 1983-09-03
Filing date: 1983-09-03
Publication date: 1985-03-30

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図は本考案の実施例を示す構成図、第２図は第１図
の装置中の制御回路の構成を示すブロック図である。主要部分の符号の説明、１・・・・・・大気吸入口、２
・・・・・・エアクリーナ、３・・・・・・気化器、５
・・・・・・絞り弁、６・・・・・・ベンチュリ、７・
・・・・・チョーク弁、１０・・・・・・排気マニホー
ルド、１１・・・・・・吸気２次空気通路、１２，１６
・・・・・・吸気２次空気制御弁、１５゜１８・・・・
・・電磁弁、２０・・・・・・サージタンク、２１・・
・・・・一定員圧制御弁、３１・・・・・・負圧制御部
、５９・・・・・・酸素濃度センサ、５９・・・・・・
吸気マニホールド、６０・・・・・・負圧スイッチ。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the structure of a control circuit in the apparatus shown in FIG. Explanation of symbols of main parts, 1... Atmosphere intake port, 2
... Air cleaner, 3 ... Carburetor, 5
... Throttle valve, 6... Venturi, 7.
...Choke valve, 10...Exhaust manifold, 11...Intake secondary air passage, 12, 16
...Intake secondary air control valve, 15°18...
...Solenoid valve, 20...Surge tank, 21...
... Constant pressure control valve, 31 ... Negative pressure control section, 59 ... Oxygen concentration sensor, 59 ...
Intake manifold, 60... Negative pressure switch.

Claims

[Scope of utility model registration request]

(1) determining means for determining an air-fuel ratio based on the exhaust gas concentration of the internal combustion engine and generating an air-fuel ratio signal representing the determination result; first and second intake secondary air passages communicating downstream of the carburetor throttle valve; a first air control valve that is provided in the first intake secondary air passage and changes a flow passage cross-sectional area of the first intake secondary air passage according to the pressure of the first pressure receiving chamber; and the first air control valve. a first control pressure generation source that generates a first control pressure capable of opening the valve; a second control pressure generation source generating a second control pressure capable of closing the first air control valve; and the air-fuel ratio signal. communication means for supplying either the first or second control pressure to the first pressure-receiving chamber so as to gradually increase or decrease the cross-sectional area of the first intake secondary air passage according to the content of the control pressure; and,
an on-off valve that is installed in the second intake secondary air passage and opens and closes the second intake secondary air passage according to the content of the air-fuel ratio signal, and when the engine is under low load, the second intake secondary air passage is connected to the first pressure receiving chamber. An intake secondary air supply device characterized in that the supply of the first control pressure is stopped and the second control pressure is supplied to the first pressure receiving chamber.

(2) In addition to the on-off valve, the second intake secondary air passage includes a second air control valve that changes the cross-sectional area of the passage according to the pressure in the second pressure receiving chamber, and The intake secondary air supply device according to claim 1, wherein a controlled negative pressure is supplied to the chamber according to the operating state of the engine.