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Publication numberUS3911872 A
Publication typeGrant
Publication dateOct 14, 1975
Filing dateMay 1, 1973
Priority dateMay 13, 1972
Also published asDE2324115A1, DE2324115C2
Publication numberUS 3911872 A, US 3911872A, US-A-3911872, US3911872 A, US3911872A
InventorsRonald William Hughes
Original AssigneeLucas Electrical Co Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fuel supply systems for internal combustion engines
US 3911872 A
Abstract
A fuel supply system for an internal combustion engine comprises a pump feeding fuel to one or more injector nozzles. A digital electronic fuel control unit controls the flow of fuel to the nozzles in response to signals from a digital encoder whose output is dependent upon the angle of a vane controlling the admission of combustion air into the engine. The digital encoder includes an arm mounted on a spindle carrying the vane. The arm has a series of contacts thereon which move relative to fixed contact areas as the vane pivots with the spindle so that a digital output is obtained in accordance with the angle of the vane.
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United States Patent Hughes Oct. 14, 1975 FUEL SUPPLY SYSTEMS FOR INTERNAL 3,720,193 3/1973 Monpetit 123/32 EA COMBUSTION ENGINES 3,752,139 8/1973 Asplund 123/117 R 3,780,711 12/1973 Lindberg 123/32 EA [75] Inventor: Ronald W1lliam Hughes,

Birmingham, England OTHER PUBLICATIONS 73 Assignee; The Lucas Electrical Company Electronic Fuel Injection Reduces Automotive Pollu- Limited, Birmingham, England tion, M. Williams, Electronics, Sept. 11, 1972, pp.

121-125. [22] Filed: May 1, 1973 [21] Appl. No.2 356,128 Primary Examiner-Charles J. Myhre Assistant Examiner-Joseph Cangelosi Foreign Application Priority Data Attorney, Agent, or Firm-Holman & Stern May 13, 1972 United Kingdom 22781/72 [57] ABSTRACT [52] 123/32 EA; 123/32 AE; 123/117 R; A fuel supply system for an internal combustion en- 2 123/1 19 R; 123/139 E gine comprises a pump feeding fuel to one or more in- [51] Int. Cl. F021) 5/02 jector noZz]S A digital electronic fuel control unit [58] held of Search 123/32 32 139 controls the flow of fuel to the nozzles in response to 123/119 signals from a digital encoder whose output is dependent upon the angle of a vane controlling the admis- [56] References C'ted sion of combustion air into the engine. The digital en- UNITED STATES PATENTS coder includes an arm mounted on a spindle carrying 3,592,178 7/1971 Schiff 123/148 1-: the vane The arm has a Series Of Contacts thereon 3,593,692 7/1971 Scholl 123/32 EA which move relative to fixed contact areas as the vane 3,612,008 10/1971 Beishirw 123/32 EA pivots with the spindle so that a digital output is ob- 3,616,780 1 1 H8 6 123/32 EA tained in accordance with the angle of the vane. 3,669,081 6/1972 Mon Petit 1. 123/139 E 3,689,753 9/1972 Lucas 123/32 EA 6 Claims, 4 Drawing Figures 1 /l 1 9 DIGITAL DIGITAL FUEL CONTROLLER u THROTTLE 16 B/ AIR INTAKE MANIFOLD VALVE I PU P ENGINE I! I7 TI HER SPEED SENSOR A '8 US. Patent Oct.14,1975 Sheet 1 of2 3,911,872 I IO q' DIGITAL DIGITAL FUEL CONTROLLER |5 IZflL 2 k2 I2 U L] u u 13/ AIR INTAKE MANIFOLD SKEJE H H H ENGINE vg fi /ZQ DIGITAL DIGITAL CONTROL ENCODER AS 5 SPRAY NOZZLE TIIIRAOLTVTELE I6 I I II II I II UT ENGINE Z i SSPEED PUMP ZZ L F G I SP QE IE T OR I U.S. Patent Oct. 14, 1975 Sheet 2 of2 3,911,872

FUEL SUPPLY SYSTEMS FOR INTERNAL COMBUSTION ENGINES This invention relates to fuel supply systems for internal combustion engines.

A fuel supply system in accordance with the invention includes a throttle valve for controlling the admission of combustion air to an engine and having an angularly movable spindle, a digital encoder for said throttle valve for producing a digital output corresponding to the angular position of the spindle, and a digital electronic fuel control unit responsive to the output of the digital encoder for controlling the rate at which fuel is supplied to the engine in accordance with the output of the digital encoder.

In the accompanying drawings FIGS. 1 and 2 are diagrammatic representations of two examples of fuel supply systems in accordance with the invention, for an internal combustion engine, and

FIGS. 3 and 4 are mutually perpendicular sections through a throttle valve which can be employed in either system.

The system shown in FIG. 1 includes a digital electronic fuel control device which controls the supply of fuel, pressurised by a pump 11, to injection nozzles 12 in an air intake manifold 13 of the engine. The digital control device 10 has inputs from a speed sensing device 14 and from a digital encoder 15 associated with a throttle 16 which controls admission of combustion air to the manifold 13 under the control of a pedal 17. The timing of the injections is controlled by a timing device 18. The quantity injected in each cycle is controlled by the device 10.

In the system shown in FIG. 2, a single spray nozzle 19 is used which sprays fuel into air intake downstream of the throttle. In this case, digital control device 20 is used to drive a variable speed electric motor 21 which drives a pump 22 supplying the nozzle 19. The rate of injection is controlled by the device 20.

In each case, the throttle valve 16 has a spindle 23 which is turned to move a vane 24 within a passage through the throttle valve body. An electrically insulating arm 25 is mounted on the spindle 23 and a row of contacts 26 on this arm 25 engage a printed circuit board 27 mounted on the body. One of these contacts is permanently in contact with an arcuate conductive area 27a on this board. The remaining contacts 26 run over arcuate rows of alternately conductive and nonconductive areas on the board 27, the conductive areas of each arcuate row being connected together and thereby to an associated one of a plurality of terminals 27b on the board. Thus, for any position of the spindle a predetermined number of the terminals 27b are connected to the area 27a and the remainder are isolated from the area 27a. Preferably the conductive areas on the board are arranged to give a Gray, coded digital output, as is already known in shaft encoders, so that only one output changes at any time as the spindle is turned.

The encoder 15 provides a digital input into the digital control device 10 or 20, which, taken in combination with the signal from the speed sensing device 14 determines the output of the device 10 to control the rate of fuel input.

Details concerning the digital fuel control circuits l0 and 20, speed centers 14, and timing device 18 may be found, for example, in US. Pat. No. 3,689,753, issued Sept. 5, 1972, to Williams et al and assigned to the same assignee as the present application, said patent being expressly incorporated herein by reference.

I claim:

1. A fuel supply system including a throttle valve for controlling the admissions of combustion air to an engine and having an angularly movable spindle, a digital encoder for said throttle valve for producing a digital output signal corresponding to the angular position of the spindle, and a digital electronic fuel control unit responsive to said output signal of the digital encoder for controlling the rate at which fuel is supplied to an engine in accordance with said output signal of the digital encoder, said encoder including an arm mounted for angular movement with the spindle, a plurality of contacts mounted on said arm, the number of said contacts corresponding to the number of bits of said digital output signal, and a plurality of fixed digitally coded contact paths equal in number to and arranged in a one-to-one contacting relationship with said contacts on said arm and relative to which the contacts on the arm are movable upon angular movement of the spindle so as to generate a plurality of different digitally coded output signals.

2. A fuel supply system as claimed in claim 1, including at least one fuel injector nozzle for supplying fuel to the engine, and wherein the fuel control unit is arranged to control the flow of fuel to the said at least one nozzle.

3. A fuel supply system as claimed in claim 2, wherein a pump is arranged to supply fuel to the control unit which controls flow of fuel therefrom to the said at least one nozzle.

4. A fuel supply system as claimed in claim 2, wherein a pump is provided for supplying fuel, and a variable speed motor controlled by the fuel control unit drives the pump.

5. A fuel supply system as claimed in claim 1, wherein one of the contacts on the arm is permanently in contact with an arcuate conductive area and other contacts on the arm are movable over arcuate rows of alternately conductive and non-conductive areas, the conductive areas of each arcuate row being connected to a terminal so that for any position of the spindle a predetermined number of the terminals are connected to the said arcuate conductive area and the remainder are isolated from the said arcuate conductive area.

6. A fuel supply system as claimed in claim 5, wherein the conductive areas are arranged so that only one output changes at any time as the spindle is turned. i

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3592178 *Oct 15, 1969Jul 13, 1971Peter SchiffElectronic ignition timing circuit
US3593692 *May 9, 1969Jul 20, 1971Bosch Gmbh RobertElectrical fuel injection arrangement for internal combustion engines
US3612008 *Feb 16, 1970Oct 12, 1971Acf Ind IncVacuum-responsive voltage generator for a fuel injection system
US3616780 *Sep 26, 1969Nov 2, 1971Bosch Gmbh RobertElectrically controlled fuel injection arrangement for internal combustion engines
US3669081 *May 18, 1970Jun 13, 1972Sopromi Soc Proc Modern InjectElectronically controlled injecting arrangements feeding fuel under constant pressure into internal combustion engines
US3689753 *Sep 15, 1970Sep 5, 1972Lucas Industries LtdEngine control systems
US3720193 *Apr 13, 1971Mar 13, 1973Sopromi Soc Proc Modern InjectMethod and apparatus for coding and reading data governing the duration of energization of fuel injection in an internal combustion engine
US3752139 *Nov 23, 1971Aug 14, 1973Gte Sylvania IncElectronic ignition timing system for internal combustion engines
US3780711 *Dec 16, 1971Dec 25, 1973Acf Ind IncElectronic fuel injection system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3983851 *Mar 14, 1975Oct 5, 1976Hitachi, Ltd.Electronic fuel injection apparatus
US4098252 *Mar 22, 1977Jul 4, 1978Daimler-Benz AktiengesellschaftMethod and apparatus for carrying out the method to control a multi-cylinder internal combustion engine
US4116177 *Jan 21, 1977Sep 26, 1978Whatley Jr NormanPre-volatilizing electronically controlled carburetor
US4143622 *Nov 17, 1976Mar 13, 1979Robert Bosch GmbhFuel injection apparatus for internal combustion engines
US4144847 *Dec 23, 1976Mar 20, 1979Nissan Motor Company, LimitedEmission control apparatus for internal engines with means for generating step function voltage compensating signals
US4172433 *Dec 5, 1975Oct 30, 1979Robert Bosch GmbhProcess and apparatus for fuel-mixture preparation
US4356803 *Mar 5, 1981Nov 2, 1982Toyota Jidosha Kogyo Kabushiki KaishaMethod and apparatus for controlling the fuel feeding rate of an internal combustion engine
US4450815 *May 4, 1982May 29, 1984Hitachi, Ltd.Internal combustion engine control apparatus
US4452202 *Dec 24, 1981Jun 5, 1984Acf Industries, Inc.Vacuum pressure transducer
US5415144 *Jan 14, 1994May 16, 1995Robertshaw Controls CompanyThrottle position validation method and apparatus
WO2003023802A1 *Sep 10, 2002Mar 20, 2003Broghammer PeterElectric switch
Classifications
U.S. Classification123/494, 261/DIG.740
International ClassificationF02D41/24, F02D41/40, F02D45/00, F02D35/00, F02D41/34
Cooperative ClassificationY10S261/74, F02D41/28, F02D2041/283, F02D2200/0404
European ClassificationF02D41/28