JPH0365848U

JPH0365848U -

Info

Publication number: JPH0365848U
Application number: JP12721089U
Authority: JP
Priority date: 1989-10-31
Filing date: 1989-10-31
Publication date: 1991-06-26

Description

[Brief explanation of drawings]

第１〜３図は本考案の一実施例としてのキヤブ
レタ付きエンジンの燃料制御装置を示すもので、
第１図はその模式的な構成図、第２図はその各部
の動作を示すタイムチヤート、第３図ａ，ｂはそ
の燃料吐出特性を示すグラフであり、第４図は従
来のキヤブレタ付きエンジンの燃料制御装置を示
す模式的な構成図である。１……燃焼室、２……ピストン、３……吸気通
路、４……吸気弁、５……キヤブレタ、１０……
加速ポンプ、１１……冷却水通路、１２……サー
モバルブ、１３……負圧リーク機構としての第２
のサーモバルブ、１４……フロート室、１４ａ…
…フロート、１６，１７……逆止弁、１８ｂ，１
８ａ……燃料流路、１９……サブノズル、２０ａ
〜２０ｃ……負圧導入路、２１ａ……入口、２１
ｂ……出口、２２……弁体、３１……第１のダイ
ヤフラム、３２……第２のダイヤフラム、３１ａ
，３１ｂ，３２ａ，３２ｂ……ストツパ、３３…
…壁部、３４……燃料溜り、３５……第１の負圧
室、３６……第２の負圧室、３７，３８……リタ
ーンスプリング、３９……第２の負圧室調整用バ
ルブとしてのソレノイトバルブ、３９ａ……吸気
負圧入口、３９ｂ……吸気負圧出口、３９ｃ……
リーク口、３９ｄ……オリフイス、３９ｅ……弁
体、３９ｆ……ソレノイド。 Figures 1 to 3 show a fuel control system for a carbureted engine as an embodiment of the present invention.
Fig. 1 is a schematic configuration diagram of the engine, Fig. 2 is a time chart showing the operation of each part, Fig. 3 a and b are graphs showing its fuel discharge characteristics, and Fig. 4 is a conventional carbureted engine. FIG. 2 is a schematic configuration diagram showing a fuel control device of the present invention. 1... Combustion chamber, 2... Piston, 3... Intake passage, 4... Intake valve, 5... Carburetor, 10...
Acceleration pump, 11...Cooling water passage, 12...Thermo valve, 13...Second as a negative pressure leak mechanism
Thermo valve, 14...float chamber, 14a...
...Float, 16, 17...Check valve, 18b, 1
8a...Fuel flow path, 19...Sub nozzle, 20a
~20c... Negative pressure introduction path, 21a... Inlet, 21
b... Outlet, 22... Valve body, 31... First diaphragm, 32... Second diaphragm, 31a
, 31b, 32a, 32b...stopper, 33...
... Wall portion, 34 ... Fuel reservoir, 35 ... First negative pressure chamber, 36 ... Second negative pressure chamber, 37, 38 ... Return spring, 39 ... Second negative pressure chamber adjustment valve Solenoid valve as, 39a... Intake negative pressure inlet, 39b... Intake negative pressure outlet, 39c...
Leak port, 39d... Orifice, 39e... Valve body, 39f... Solenoid.

Claims

[Scope of utility model registration request]

In an engine with a carburetor, an acceleration pump is operated in response to negative intake pressure in an intake passage to increase the amount of fuel jetted from the carburetor, and an intake negative pressure for driving the pump is introduced from the intake passage to the acceleration pump. The accelerator pump drives fuel to the carburetor, and includes a first negative pressure introduction path and a thermovalve that is interposed in the intake negative pressure introduction path and opens when the engine temperature is low and closes when the temperature is high. a first diaphragm provided in series with the first diaphragm, and a second diaphragm provided between the first diaphragm and the second diaphragm and from the first negative pressure introduction path. A first negative pressure chamber into which intake negative pressure is introduced, a second negative pressure chamber provided adjacent to the second diaphragm, and intake negative pressure from the intake passage to the second negative pressure chamber. The second step is to introduce
a negative pressure introduction path, and a second negative pressure chamber adjustment device that is interposed in the second negative pressure introduction path and is appropriately driven and controlled to send negative pressure to the second negative pressure chamber or to leak negative pressure. A fuel control device for an engine with a carburetor, characterized by comprising a valve.