JPS6375530U

JPS6375530U -

Info

Publication number: JPS6375530U
Application number: JP6880587U
Authority: JP
Priority date: 1986-05-09
Filing date: 1987-05-08
Publication date: 1988-05-19
Anticipated expiration: 2002-05-08
Also published as: JPH0723544Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る２サイクルエンジンの排
気制御装置の一実施例を示した図、第２図はその
排気制御装置を備えたエンジンの運転状況を示し
たグラフ、第３図は本考案に係る排気制御装置の
他の実施例を示した図、第４図はエンジンの排気
管容積を変えた状態における出力特性を示した図
である。１……２サイクルエンジン、３……エキゾース
トポート、４……サブチヤンバ、５……排気管容
積可変バルブ、６……スロツトルバルブ、７……
シリンダ、８……インレツトポート、１０……Ｃ
ＤＩユニツト、１０ａ……周波数―電圧変換器、
１２……回転数検出手段、１３……混合気量検出
手段、１４……アクチユエータ、１５……制御手
段、１６……ダイヤフラムスイツチ、１７……ダ
イヤフラム、１８……パイプ、１９……スプリン
グ、２０……コントローラ、２１……スイツチ機
構、２３……接触子。 Fig. 1 is a diagram showing an embodiment of the exhaust control device for a two-stroke engine according to the present invention, Fig. 2 is a graph showing the operating status of an engine equipped with the exhaust control device, and Fig. 3 is a diagram showing an embodiment of the exhaust control device for a two-stroke engine according to the present invention. FIG. 4 is a diagram showing another embodiment of the exhaust control device according to the present invention, and FIG. 4 is a diagram showing output characteristics when the exhaust pipe volume of the engine is changed. 1... 2-cycle engine, 3... Exhaust port, 4... Subchamber, 5... Exhaust pipe volume variable valve, 6... Throttle valve, 7...
Cylinder, 8...Inlet port, 10...C
DI unit, 10a...frequency-voltage converter,
12... Rotation speed detection means, 13... Air mixture amount detection means, 14... Actuator, 15... Control means, 16... Diaphragm switch, 17... Diaphragm, 18... Pipe, 19... Spring, 20 ...Controller, 21...Switch mechanism, 23...Contactor.

Claims

[Claims for Utility Model Registration] (1) A subchamber attached to an exhaust port, and a variable exhaust pipe volume valve disposed between the subchamber and the exhaust port,
a rotation speed detection means for detecting the rotation speed of the engine;
Based on the detection signals from the mixture amount detection means for detecting the amount of mixture supplied to the engine, the actuator for opening and closing the variable exhaust pipe volume valve, the rotation speed detection means and the mixture amount detection means, When the engine rotation speed is lower than a predetermined rotation speed, the variable exhaust pipe volume valve is opened, and when the engine rotation speed exceeds the predetermined rotation speed, the exhaust pipe volume variable valve is closed and the engine rotation speed is increased. and control means for sending a drive signal to the actuator to open the variable exhaust pipe volume valve when the number of revolutions is at least a predetermined number of rotations and the amount of air-fuel mixture is less than or equal to a predetermined amount. This is an exhaust control device for a two-stroke engine. (2) Exhaust control for a two-stroke engine according to claim 1, wherein the rotation speed detection means includes a pulse generator for timing the ignition of a spark plug. Device. (3) The two-stroke engine according to claim (1) of claim 1, wherein the mixture amount detection means is a means for detecting pressure at an inlet port from the throttle valve to the engine. exhaust control device. (4) The exhaust gas control device for a two-stroke engine according to claim 1, wherein the mixture amount detection means is a means for detecting the amount of movement of a throttle valve. (5) The exhaust control device for a two-stroke engine according to claim 1, wherein the actuator is a rotary solenoid.