US2794432A

US2794432A - Fuel injection apparatus

Info

Publication number: US2794432A
Application number: US462183A
Authority: US
Inventors: Carl H Nystrom
Original assignee: American Bosch Arma Corp
Current assignee: Ambac International Corp
Priority date: 1954-10-14
Filing date: 1954-10-14
Publication date: 1957-06-04
Anticipated expiration: 1974-06-04

Description

June 4, 1957 c. H. NYsTRoM 794,432

FUEL INJECTONAPPRTS Filed oet. 14, 1954 e sheets-sheet 1 a Bywm/M June 4, 1957 c. H. NYs'rRoM FUEL INJEGTIGH APFARTUS Filed 001'.. 14, 1954 nu u @y l 25 IO l5 A INVENTOR. (ZAP L H NVSTE'O M TP/VEK June 4, 1957 c; H. NYS-mom 2,794,432

FUEL INJECTION APPARATUS Filed OCT.. 14, 1954 B She'ets-Sheet 3 INVENTOR. CAE H. NYsTEoM A TTOP/VEK June 4, 1957 c; H. NYsTRoM y 2,794,432

FUEL INJECTION APPARATUS Filed 0G11.- 14, 1954- 6 Sheets- Sheet 4 IN VEN TOR.

CAT? l-l NYSTEOM June 4, 1.957 c. H. NYs'rRoM 2,794,432

FUEL'. INJECTION APPARATUS Filed Oct. 14, 1954 6 Sheets-Sheet 5 JNVENTOR.

CA2 a.' r-l NYS-VROM A TTE'NEY June 4, 1957 c. H. NYsrRoM 2,794,432

FUEL. INJECTIoN APPARATUS Filed oct. 14, 1954 6' sne'ts-sneet e A INVENTOR. CAL H. NYSTEOM 'Vw M ATraP/VEX States FUEL INJECTIoN APPARATUS Application October 14, 1954, Serial No. 462,183

16 Claims. (Cl. 12S- 139) This invention relates to a new and improved fuel in jection system for use with spark ignition internal combustion engines and has particular reference to the provision of such a system with means for providing excess or additional fuel for starting and also for acceleration.

The principal object of the invention is to provide a new and improved fuel injection system having means for providing excess or additional fuel for starting and for acceleration.

Another object is to provide a new and improved means for providing additional fuel for starting and for acceleration in a fuel injection system wherein means is provided for adjusting the injection pump control to excess fuel position. v

Another object is to provide an arrangement of the type set forth wherein the throttle control may be temporarily adjusted to excess fuel position to enrich the mixture to allow the engine to accelerate and wherein the throttle rod may automatically return to normal mixture control setting.

Other objects and advantages of the invention Will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts shown and described, as the preferred forms have been given by Way of illustration only.

Referring to the drawings:

Fig. l is a side view, partially in section, of a fuel injection apparatus embodying the invention;

Fig. 2 is a front View of the throttle body and mixture control;

Fig. 3 is a bottom view of the apparatus shown in Fig. 2;

Fig. 4 is a fragmentary side view, partially in section, generally similar to Fig. l, but on an enlarged scale;

Fig. 5 is a rear view of the apparatus shown in Figs. 2 and 3;

Fig. 6 is a sectional view taken on line 6 6 of Fig. 4, looking in the direction of the arrows;

Fig. 7 is a fragmentary sectional view taken on line 7-7 of Fig. 4, on an enlarged scale;

Fig. 8 is a view generally similar to Fig. 4, but showing a modified form of the invention; and

Fig. 9 is a view generally similar to Fig. l, but showing a simplified form of the invention.

Referring more particularly to the dra 'ings wherein similar reference characters designate corresponding parts throughout, the arrangement shown embodying the invention compises a throttle body designated generally at 10, mixture control designated generally at 11 and fuel injection pump designated generally at 12.

The throttle body 19, mixture control 11 and injection pump 12 are generally similar to those shown Vin application Serial Number 410,908, tiled February 17, 1954, and the present invention is intended to be applied to the fuel injection systemv shown in that application in order atent to provide such system with additional or excess fuel for starting and for acceleration.

The mixture control 11 is of the manifold density type and is adapted to be connected to the injection pump for automatically controlling the setting of the fuel quantity delivered by the pump relative to the air in fuel ratio established by the pressure drop across the throttle body. A lever on the shaft 13 of the buttery 14 is adapted to be connected to the usual foot throttle and controlled thereby for controlling the speed or load of the engine.

The mixture control unit 11 consists of a cylinder 15 in which is mounted piston 16 which is adapted to be actuated by manifold depression through pressure drop across butterflies 14 which are adjusted by shaft 13 by the throttle, as previously described. For every throttle position, there is a corresponding manifold depression, thus creating a definite fixed position of piston 16 and which is controlled by the rate of spring 17.

The mixture control 11 is also provided with the idle adjusting screw 44 which may be employed when the mixture control is used for idle enrichment and screw 44 is adapted to extend through the open end of member 45 and engage spring stop 46 when the member 45 is moved to idle position. In this manner, by adjustment of screw 44, the idle enrichment may be adjusted.

Fuel control rod 18 is connected at one end to lever 19 which in turn is connected to the fuel pump quantity control 20 for control of the quantity of fuel delivered by the pump.

The opposite end of rod 18 is connected to lever 21 which is pivotally mounted at 22a on the mixture control 11 and is adapted to be actuated by the actuation of piston 11, which in turn is actuated by manifold depression of spring 17, as previously described, and movement of piston 11 effects movement of arm 22 which pivots lever 23 which in turn pivots lever 21.

The arrangement previously described allows adjustment of the injection pump control within normal operating range but does not provide any means whereby additional fuel may be provided for starting or acceleration.

In order to provide such additional fuel for starting or acceleration, means is provided for temporarily moving the throttle rod 1S to adjust the pump control 2G to excess fuel position.

For providing excess or additional fuel for acceleration, means is provided for moving the throttle rod 1S temporarily beyond the normal mixture control setting, that is, to excess fuel position. This means comprises a lever 24 on the shaft 13 which is connected to the usual throttle and adapted to be Vmanually operated and lever 24 is connected by rod 25 to dashpot member 26 which is positioned on rod 18 and piston 27 which is iixed on rod 18 is positioned within dashpot 26 and sutlicient clearances are provided between the periphery of the piston 27 and the adjacent walls of dashpot 26, where said rod extends through openings in said walls, whereby fixed movement of the throttle effects xed movement of rod 25 and dashpot 26 and this xed movement causes movement of piston 27 and rod 18 which is fixed thereto to move the pump control 20 to excess fuel position.

It will be seen that the rod 13 may move beyond its normal operating range because of the slot 28 in which is positioned pin 29 on lever 21 and which is retained in engagement with the adjacent edge of slot 23 by means of the spring 30 which arrangement effects a normal shortening of the throttle rod 18, but allows a temporarily lengthening thereof upon fast movement of rod 25, as previously described, and spring 2S effects a return of rod 18 and pump control 29 to normal operating range quickly after the pump has been moved beyond the normal l range to provide excess fuel for starting.

This adjustment of throttle rod 18 to excess fuel position causes excess fuel to be delivered through the nozzles to the point above the intake valve, that is, it delivers cxce/ssfuel to a point where it is most effective and where it is immediately used and where the usual injection takes place and, thus, requires less fuel than if such excess fuel were merely injected into the manifold.

In Fig. 7 is shown the ducts and porting of the throttle body whereby the pressure drop across the butterflies is operated.

In Fig. 8 is shown a slightly modified form of the present invention wherein the dashpot designated generally at 30 and which comprises the pair of

telescoping tubes

31 and 32 is positioned between the throttle actuatedlever 24 and an extension on lever 21. In this form ofthe invention, instead of the spring 3l) in slot 28 on the'end of throttle rod 18 being provided for returning the throttle rod to its normal operating range, spring 33 is provided within the mixture control body 11 and is adapted to effect return of arm 34 which is connected to lever 21 by means of

levers

35 and 36.

In this form of the invention a quick movement of the throttle causes a corresponding quick movement of member 32 which eifects movement of member 31 to pivot lever 21 and thereby move rod 18 to excess fuel position which is beyond its normal operating range and against the force of spring 33, which spring immediately causes f the rod 18 or formed separately and secured thereto with the weight or mass of weight 47 being such as to accomplish lthe purpose of the invention, that is, move control rod 18 and pump control 20 beyond normal full load position, upon fast movement or acceleration of rod 18 whereby said Weight 47 will carry rod 18 beyond normal position and against the force of spring 30 or fast and extremely rapid acceleration or movement of rod 18, .that is, when the rod 18 has been moved rapidly toward or to normal full load position, the weight 47 on rod 18 will continue to move rod 18 beyond normal full load position to thereby provide additional fuel as stated above. This arrangement also eliminates the possibility of interference by rod 25 and cylinder 26 upon relatively slow movement of control rod 18.

This arrangement provides a relatively simple and economical construction which provides the additional fuel for rapid acceleration and yet eliminates any possible interference with the slower acceleration.

From the foregoing, it will be seen that I have provided new and improved means for providing additional or excess fuel for starting and for acceleration in a fuel .injection system employing a fuel injection pump and wherein the pump control is adjusted to excess fuel position temporarily for the purpose of. providing the additional fuel and is thereafter quickly returned to its normal operating range and setting as determined by the mixture control.

In Fig. 6 of the drawings will be seen the thermostatic member 37 and solenoid 3S as well as the valve 39 which is adjustable longitudinally and which has the

landY portions

40 and 41 for controlling the passage of air through the

passages

42 and 43.

The operation of the device is believed apparent from the foregoing description.

From the above, it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

I claim: j

l. In an air and fuel supply system for an internal combustion engine, a fuel injection pump, said pump having an adjustable fuel quantity control for adjustably controlling the quantity of fuel delivered by said pump, a mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers, an adjustable member connecting said quantity control and said mixture control for adjusting said quantity control within normal limits and manually operated means for adjusting said quantity control beyond normal full load position.

2. In an lair and fuel supply system for an internal combustion engine, a fuel injection pump, said pump having a fuel quantity control for controlling the quantity of fuel delivered by said pump, a mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers, a control rod connecting said quantity control and mixture control for adjusting said control Within normal limits and manually operated means for adjusting said control beyond normal full load position.

3. In an air and fuel supply system for an internal combustion engine, a fuel injection pump, said pump having a fuel quantity control for controlling the quantity of fuel delivered by said pump, a mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers, a control rod connected to said quantity control and to said mixture control, an adjustable member for controlling the adjustment of said mixture control to thereby adjust said quantity control within normal limits and manually operated means connecting said adjustable member and quantity control for adjusting said quantity control beyond normal full load position.

4. In an air and fuel supply system for an internal combustion engine, a fuel injection pump, said pump having a fuel quantity control for controlling the quantity of fuel delivered by said pump, a mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/ air ratio in the combustion chambers, a control rod connected to said quantity control and to said mixture control, an adjustable member for con trolling the adjustment of said mixture control to thereby adjust said quantity control within normal limits and manually operated means connecting said adjustable member and said control rod for adjusting said quantity control beyond normal full load position.

5. In an air and fuel supply system for an internal combustion engine, a fuel injection pump, a mixture control, linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and manually operated means for increasing the normal length of said linkage for increasing the fuel quantity beyond normal full load. p

6. In an air and fuel supply lsystem for an internal combustion engine, an injection pump, a mixture control and linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/ air ratio in the combustion chambers with the control of said injection pump and manually operated means for increasing the effective length of said linkage means for increasing the fuel quantity beyond normal full load.` Y

7. In an air and fuel supply system for an internal combustion engine, a fuel injection pump,V a mixture control, a throttle controlled air intake, linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/ air ratio in the combustion chambers with the control of said injection pump and means for increasing the normal length of said linkage for increasing the fuel quantity beyond normal full load, said means comprising throttle controlled means connected to said linkage for effecting temporary adjustment of said linkage beyond normal full load position.

8. In an air and fuel supply system for an internal combustion engine, an injection pump, a mixture control, a throttle controlled air intake, linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and manually operated means for increasing the effective length of said linkage means for increasing the fuel quantity beyond normal full load, said means comprising throttle controlled means connected to said linkage for effecting temporary adjustment of said linkage beyond normal full load position.

9. In an air and fuel supply system for an internal combustion engine, a fuel injection pump, a mixture control, linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and means for increasing the normal length of said linkage for increasing the fuel quantity beyond normal full load, said means comprising a second link connected to said first link by a connection whereby only relatively rapid movements of said second link will effect movement of said iirst link.

10. In an air and fuel supply system for an internal combustion engine, an injection pump, a mixture control and linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and manually operated means for increasing the effective length of said linkage means for increasing the fuel quantity beyond normal full load, said means comprising a second link connected to said first link by a connection whereby only relatively rapid movements of said second link will eifect movement of said iirst link.

11. In an air and fuel supply system for an internal combustion engine, a fuel injection pump, a mixture control, linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and manually operated means for increasing the normal length of said linkage for increasing the fuel quantity beyond normal full load and a resilient section on said first link to allow adjustment thereof beyond normal full load position. i

12. In an air and fuel supply system for an internal combustion engine, an injection pump, a mixture control and linkage means connecting said mixture control connected to said pump for automatically controllingV the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and manually operated means for increasing the effective length of said linkage means for increasing the fuel quantity beyond normal full load and a resilient section on said first link to allow adjustment thereof beyond normal full load position.

13. In an air and fuel supply system for an internal combustion engine, a fuel injection pump, a mixture control, linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel ldelivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and means for increasing the normal length of said linkage for increasing the fuel quantity beyond normal full load, said means comprising a second link connected to said first link by a dashpot connection and a resilient section on said rst link to allow adjustment thereof beyond normal full load position.

14. In an air and fuel supply system for an internal combustion engine, an injection pump, `a mixture control and linkage means connecting said mixture control connected to said pump for automatically controlling the quantity of fuel delivered by the pump and thereby controlling the fuel/air ratio in the combustion chambers with the control of said injection pump and manually operated means for increasing the effective length of said linkage means for increasing the fuel quantity beyond normal full load, said means comprising a second link connected to said irst link by a dashpot connection and a resilient section on said first link to allow adjustment thereof beyond normal full load position.

15. In a device of the character described, a fuel injection pump, said pump having a fuel quantity control for controlling the quantity of fuel delivered by said pump, a control rod for adjusting said control within normal limits and means connected to said rod for adjusting said quantity control beyond normal full load position upon fast movement of said rod toward full load position, said means comprising weight means conected to said control rod, the momentum of said weight means being adapted to effect further movement of said rod when rapid movement of the rod by other forces is discontinued and resilient means for allowing such further movement and for returning said rod and weight means to normal position.

16. In a `device of the character described, a fuel injection pump, said pump having a fuel quantity control for controlling the quantity of fuel delivered by said pump, a control rod for adjusting said control within normal limits and means connected to said rod for adjusting said quantity control beyond normal full load position upon fast movement of said rod toward full load position, said means comprising weight means carried by said control rod, the momentum of said weight means being adapted to elfect further movement of said rod when rapid movement of the rod by other forces is discontinued and resilient means for allowing such further movement and for returning said rod and weight means to normal position.

References Cited in the tile of this patent UNITED STATES PATENTS 2,485,186 Boyle Oct. 18, 1949 2,571,571 Hanners et al. Oct. 16, 1951 FOREIGN PATENTS 707,720 Great Britain Apr. 2,1, 1954