DE2444998A1 - FUEL CONTROL SYSTEM FOR COMBUSTION ENGINE - Google Patents

Description

COHAUSZ & PLORACK

PATENT ADVOCATE OFFICE D-4 DÜSSELDORF. 8CHUMANNSTR. 97 9 Λ AAQQ ß

PATENT LAWYERS:
Dipl.-Ing. W. COHAUSZ Dipl.-Ing. W. FLORACK ■ Dipl.-Ing. R. KNAUF Dr.-Ing., Dipl.-Wirtsch.-Ing. A. GERBER Dipl.-Ing. HB COHAUSZ

The Lucas Electrical Company Limited Well Street GB-Birmingham 18th September 1974 Kraftsteffregelsvstem for internal combustion engine

The invention relates to a fuel control system for an internal combustion engine.

According to the invention, a fuel control system for an internal combustion engine is provided, which is characterized by a pump, at least one electronically controlled fuel injector and a pressure sensitive fuel control valve placed between the pump and the at least one injector is switched and set up such that the pressure is fed to the at least one injector is regulated according to the ambient air pressure.

In a preferred embodiment, the pressure-sensitive fuel regulating valve has a first and a second diaphragm, in the housing, means for applying a lever pressure to one side of the first diaphragm, a chamber which is arranged on a side of the second diaphragm which faces away from the first diaphragm and is arranged so that pressure in the chamber acts on the second diaphragm, a fuel inlet and a fuel outlet for the chamber and a movable valve member for regulating the pressure of fuel between the inlet and the outlet in an arrangement that the second diaphragm acts thereon The membranes have different effects, are arranged at a distance from one another and are in an operative connection with one another while being held in place by a rigid coupling.

5098U / 0834

24AA998

two outlets © are provided for the chamber, and that Y valve member is preferably set up a® that the flow of Fuel is regulated through one of the outlets.

Boron tree between the membranes is preferably filled with a medium » that is kept on a constant bridge "

In addition, the "wide membrane is arranged in such a way that it has a has a smaller effective flea than the first® membrane.

Ss Means to "T © rsparm @ n the movable valve member to a position? © rgesehen sei3 _f ia which it shuts off the flow of fluid through the outlet _s ä @ v by dae legelglied kontrolliert.wird.

It means ZV & tempering Könen be set up so that they side with the first membrane © heanimhlag sn "gegeii. dl® the control pressure is effective during operation.

The Itsfinäwag is near @ h® & d over Huiä an embodiment under Sezugnaiane "uf the Zeiclinungen & gh @ r explained. In the drawings are s

Fig. 1 © ine sohenatiecli® Dartstell ^ isg »Ines Eraftsteffregelsystems ge according to the invention,

FIG. 2 shows a detailed overview of the pressure-sensitive fuel control element ₉

Fig. A practical example of a regular fuel return in Fig. 2 let «,

The fuel control valve "g®l0yst <sn" always has a pump 10, no® @laktxenischa legeleiniieit 11 miä © ia "draek © sapfiadlicshes fuel control valve 12 open" The E @ gelY @ ntil 12 is between the pump 10 and a series of real fuel stoppers; j @ kt «r« 21 switched, imd @s is set up in such a way that ä & g d®3 »Braok toe fuel is

5098U / 083A

unit 11 is forwarded. The fuel injectors 21 are through the unit 11 is regulated in a manner known per se.

The pump 10 is set up to take fuel from a tank 15 to a BinlaB H (Fig. 2) of the sailing valve 12 via fuel lines 13 and 16 promotes. An outlet 17 of the control valve 12 is returned to the tank 15 via a return line 19, and another outlet 1? is connected to the injectors 21 via a fuel line

20 connected, which branches into lines 23. The injectors

21 are used to supply fuel to an internal combustion engine 22.

In operation, fuel is fed to the control valve 12 at a pressure that is higher than the maximum force stiffness pressure that is required will. The Hegel valve 12 then regulates the pressure of the fuel supplied to the injectors 21 in accordance with the ambient air pressure, with the control is such that excess fuel is sent to tank 13 flows back. When the ambient pressure decreases, the fuel pressure decreases and vice versa.

The fuel control valve generally consists of a composite housing 24, first and second diaphragms 25 and 25, respectively. 26 in the housing 24, the membranes 25 and 26 under the intermediate disc ton of a rigid member 27 are interconnected, and from one Chamber 28, which sits on one side of the second membrane 26, which facing away from the first membrane 25. The chamber 28 is provided with channels leading away, namely the fuel inlet 14 and the Fuel outlets 17 and 19.

The fuel control valve also has a movable valve member 29 for regulating the flow of fuel through the outlet 17, a chamber 30 between the membranes 25 and 26, which contains an oil kept under constant pressure, and another chamber 31 with an inlet 32 in communication with the atmosphere. Its compression spring arrangement 33 sits in the further chamber 3I and acts on the Side of the first membrane 25, which is acted upon by the pressure in the chamber 5I

- 4 B098H / 083A

is failed. Kiae Steh? Aubeaei & 8tellTor £ ichtu3! $ 54 is provided, xw. dea brusque to Sndem, who is brought up for the f # s des 2? ed «3? asa9xcuxaag 33.

The effective® 71 & c & e of the most Mn »to.aa® 25 is» as shown in the drawing; much gsB & ex than the d @ s? second membrane © 26 »

The 'feawtgliohe T «atllgli © i 2§> is smr 3 © w« g ^s iag nit des sweites Membran® 26 uater Zwlgclea «halt @ ai®s rigid» Sli «ds 27, whereby the link 27 st«, » with eln © a S ^ a "Egfll © d T © rMat" E ist, äas iassa swei Sslaititen. JiS am der mrs-i ^ n lun-nz ^ wz® 23 ! Bsuapemen »Bia Soheit® 56 (geslß ttsr lasoteiliiag la S ¹ Ig * 3) engages as the spring arrangement 53 a * & *

In the case of fuel goes nosa & lesvelea τ®® SialaS I4 tasch die Samaes 2S w && mn d »B IaJ®kt © zeE 21 ämxsk dea Aasla® 19 · 2! With crossing a Selldxcfeek® ctoeii € @ s Exaftstgff Ia dtr Eassmer S8 at« , tmosihärischez !. Bedisgusigen wfaiil ü ± e% w @ i% ® MmfoTm, ® 26 ss-ii'-i ebtn aufegedertert, se d & £ da «movlisii® ¥ <3Mfiig: l £ ®ä 2 $ is moved outwards, se that fuel mm Fuel tank 15 fiaseh fi © a iaslaS 1? ssuriickkaim, until the Selldraok ia der E-saiaier 28 wied @ rb®2? saufbija springs di® sweit® Emibxane 26 smri @ k $! "is the movable valve member 2f the Änssla® 17 anB3? © i © h® aä closes, in Äen l »requiredea Braek ü, @ n fuel a ^ fs? eel ^ ta% ex & alten · Se is understood that eia® movement dsp zw®i'is« B loaferaae 2-S saf dia © rat ©! © »brew 25 through intermediate holdingu ä®» etasxes gliate 27 Ibertragan becomes, so that with a SrhShnag d®s Ksaftstsffaaraoks Ia Kasaaer 28 over the target value the first M «feim # 2 gg®g« di © MIsfcBag i®s Bracks in the Kawaer J> 1 geh®b®a% irä _f ebtas® gs.gea. Ii # Effect of the ^ ederanordniing 33. When the Dirosk ia of the Eeees 28 is reversed ataf & ®a S®llwert aurlick led, & l® -ψ & ά der Feds ^ saaräa-sBg 33 «nd Yen Draok in, the laiaaer 3I exercised Esaf t ®ia springs d @ r first membrane 23 near the bottom, wa @ ein © Federuag ä®: s second Meiebrans 26 downward 2v.11 outlet 17 causes ο

If the staespfegriseh © Isiek fIiIt ₉ -veixiagsrt sioh isr Iteuek, the

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is exercised on the membrane 25, and the equilibrium is disturbed, so that the membrane 26 moves upwards and a flow ven. more fuel through outlet 17 surttck to fuel stank 13 allows. In this way the pressure of fuel is reduced, which is fed to the injectors 21, so that the desired ratio of fuel to air despite the reduction in the ambient air pressure is maintained.

Conversely, when the ambient air pressure increases, the force exerted on the first diaphragm 23 in the chamber 3I increases so that the diaphragm 26 exerts greater pressure on the movable valve member 29 and allows less fuel to overflow through the outlet 17 . The pressure at which fuel is returned to the fuel tank 13 thus increases, which leads to an increase in the fuel pressure which is supplied to the injectors 21, so that a greater amount of fuel is supplied to the desired ratio of fuel to Isift to keep right, which is fed to the internal combustion engine 22.

In this particular embodiment there are changes in air pressure of the order of 0.35 kgf / cm is required to accommodate changes in the

ο Fuel pressure in the order of 1.05 kp / cm arise too

permit.

It is understood that because of the relatively large effective area of the Membrane 25 compared to the membrane 26 shown small changes in the atmospheric pressure cause relatively large Üa & eEisgen in the pressure, the from the membrane 26 on that valve member 29 is exercised. In this way does the fuel control valve speak & uS © »£ externally sensitive to the Ambient pressure.

Expectations

"609814/0834

Claims (2)

Ansbach rüche 1 «Fuel control system for an internal combustion engine, characterized by a pump * at least one electro-controlled. Ks & £ t stoff injector 'and © in a pressure-sensitive fuel control valve that switches the pump and the at least one injector and is set up in such a way that the pressure that is fed to the at least one injector is regulated according to the ambient air pressure. 2. Fuel control system according to, ineprueh 1, characterized in that the pressure-sensitive fuel control valve has a first and aiae second Ifemteaa, ® in a housing «means for applying © inea? Side of the first membrane with a regular pressure, sine chamber, which is arranged on a gelte the second membrane, which is applied -ron of the first Meiata-aae and is arranged so that pressure in the Eaasjaea? the oweit © membrane strikes a fuel - elnlB uad a ex-aftstoffamsla-g flr di® camera and a movable valve member sur legsliäasg äes Iraoks of fuel between the inlet u »d de» Α · αε1 »Β in eiaer!» © riatmg has that the aw @ it @ membrane acts on it, ¥ olü®i di © lesateaaaa Ostereohiefilieh® have effective surfaces, in distance to each other augiae ^ diiet siad uad outer Swisola, © a switch sln * r rigid coupling la © in « r active pre-biting miteißaad®2? stand. 5 «Fuel regulatea Bsela, laapmoli. 2 _f ds da ι sb marked zeiehnetji iaS aw®i outlets are provided for the lasaer and that da® Tentilglieä ams legelmsg des Burofeflugse © v @ m fuel by one of the JbeI & sgö © isagericiktet ο . 4 · üraf tetoffreffölsystes atsii isasgsaoii 2 © d® ^ 33 “dadiarcli ge know β β i © ka © t» dal αθε ¹ lana swieeliem dea Msaäteannen by eia Hediuai is filled ₉ the saf @iaea ieosisteatem brusquely. 5 «Kraftsteffrrsgelsystes aeela Msasaefe 2 ₉ 3 © der 4 ₉ dsia se it f £ ®ken»! E®Iekffi © t ₉ da® the zwalt® MeKbraae oias smaller® effective fl & sMe sls the © ES'fe leate & a © 6 «Eraf tetöffregelsystea aa © & © lace d © r Aaspräoh © 2 Ms 3s da - 834 characterized in that gowns are provided to bias the movable valve member into a position in which shuts off the flow of cash through the outlet controlled by the valve member » 7 * Fuel control system according to claim. 6 ₃ characterized in that the means are set up for biasing to »work on the side of the first menbrame; the tone can be added to the Begeldruok. B098U / 0834