JPH024969U

JPH024969U -

Info

Publication number: JPH024969U
Application number: JP8375988U
Authority: JP
Priority date: 1988-06-24
Filing date: 1988-06-24
Publication date: 1990-01-12

Description

[Brief explanation of the drawing]

第１図は本考案による燃料供給装置の一実施例
を示す概略断面図、第２図Ａ乃至Ｅは第１図の装
置のタイミングチヤートを示すものであつて、Ａ
はスロツトルバルブ開度、Ｂはコンピユータ装置
によるエンジンの減速判定、Ｃはエンジン回転数
、Ｄは電磁弁のデユーテイ比、Ｅはコンピユータ
装置による加速判定を夫々示す図、第３図は従来
装置の概略断面図、第４図Ａ乃至Ｃは従来の他種
の装置のタイミングチヤートを示す図であつて、
Ａはスロツトルバルブ開度、Ｂはエンジンの減速
判定、Ｃは電磁弁のＯＮ、ＯＦＦを夫々示す図で
ある。５……空気流量検出室、７……負圧ダイアフラ
ム、８……基準圧室、１０……上流室、１２……
下流室、１３……燃料ダイアフラム、１４……オ
リフイス、１５ａ……バルブ、１６……リターン
通路、１７……電磁弁、１８……コンピユータ装
置。 FIG. 1 is a schematic sectional view showing an embodiment of the fuel supply device according to the present invention, and FIGS. 2A to 2E are timing charts of the device shown in FIG.
is the throttle valve opening, B is the engine deceleration judgment by the computer device, C is the engine rotation speed, D is the duty ratio of the solenoid valve, E is the acceleration judgment by the computer device, and Figure 3 shows the conventional device. The schematic sectional views and FIGS. 4A to 4C are diagrams showing timing charts of other types of conventional devices.
A is a diagram showing a throttle valve opening, B is a diagram showing engine deceleration determination, and C is a diagram showing ON and OFF states of a solenoid valve. 5...Air flow rate detection chamber, 7...Negative pressure diaphragm, 8...Reference pressure chamber, 10...Upstream chamber, 12...
Downstream chamber, 13... fuel diaphragm, 14... orifice, 15a... valve, 16... return passage, 17... solenoid valve, 18... computer device.

Claims

[Scope of claim for utility model registration] Pressure difference between negative pressure and reference pressure according to air flow rate,
The air-fuel ratio of the mixture is maintained constant by controlling the amount of fuel discharged so as to balance the twisting pressure difference before and after the orifice that communicates the upstream chamber into which fuel is sent and the downstream chamber from which fuel can be discharged. The pressure-balanced fuel supply system includes a return passage that returns the fuel in the downstream chamber to the fuel tank, a solenoid valve that closes the return passage during normal operation of the engine and performs duty control during deceleration, and a solenoid valve that detects the deceleration state. and a solenoid valve control means that changes the duty ratio of the solenoid valve according to a parameter corresponding to the state of the engine during deceleration, and the solenoid valve control means controls the operation of the solenoid valve before and after the orifice during deceleration. Fuel control for a fuel supply system, characterized in that the fuel discharge is stopped by increasing the fuel pressure difference between the orifices, and the magnitude of the fuel pressure difference before and after the orifice is changed depending on the state of the engine. mechanism.