GB2070151A - Liquid Fuel Injection Pumping Apparatus - Google Patents

Liquid Fuel Injection Pumping Apparatus Download PDF

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Publication number
GB2070151A
GB2070151A GB8101735A GB8101735A GB2070151A GB 2070151 A GB2070151 A GB 2070151A GB 8101735 A GB8101735 A GB 8101735A GB 8101735 A GB8101735 A GB 8101735A GB 2070151 A GB2070151 A GB 2070151A
Authority
GB
United Kingdom
Prior art keywords
distributor member
body part
sensors
circuit
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8101735A
Other versions
GB2070151B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of GB2070151A publication Critical patent/GB2070151A/en
Application granted granted Critical
Publication of GB2070151B publication Critical patent/GB2070151B/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
    • F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
    • F02M41/1411—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/025—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by means dependent on engine working temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/401—Controlling injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/406—Electrically controlling a diesel injection pump
    • F02D41/408—Electrically controlling a diesel injection pump of the distributing type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A liquid fuel injection pumping apparatus has an axially movable distributor member 28 whereby the amount of fuel delivered by the apparatus can be varied. In order to provide an indication of the axial position of the distributor member a transducer means is provided. This comprises a pair of sensors 54, 55 which sense the passage of grooves 56 and ridges on two parts 14A and 58 rotatable with the distributor member. The angular relationship between the parts varies as the distributor member is moved axially whereby the phase relationships between the signals provided by the sensors varies. A helical slot and pin connection is provided between the part 58 and the distributor member 28 to provide the aforesaid variation in the angular relationships as the distributor member is moved axially. <IMAGE>

Description

SPECIFICATION Fuel Injection Pumping Apparatus This invention relates to a liquid fuel injection pumping apparatus for supplying fuel to an internal combustion engine and of the kind comprising a body part, a rotary distributor member mounted in the body part and arranged in use to be driven in timed relationship with an engine with which the apparatus is associated, a transverse bore formed in the distributor member, a plunger in said bore, a cam follower positioned at the outer end of said plunger for engagement with a cam surface formed on a cam ring surrounding the distributor member, stop means for limiting the outward movement of the plunger, said stop means comprising complementary inclined surfaces on the follower and a part respectively, said part being rotatable with the distributor member but axially fixed within the body part whereby as the distributor member is moved axially within the body part the amount by which the plunger can move outwardly whilst fuel is supplied to the bore will vary, passage means for conveying fuel to and from said bore, during rotation of the distributor member, said distributor member being axially movable within the body part, means for varying the axial setting of the distributor member within the body part, and transducer means for providing a signal indicative of the axial setting of the distributor member.
The object of the invention is to provide an apparatus of the kind specified in a simple and convenient form.
According to the invention an apparatus of the kind specified, said transducer means comprises a first series of markings on said part, a second series of markings on a further part rotatable with the distributor member, first and second sensors mounted in the body of the apparatus for providing electrical signals upon passage of the markings past the sensors, said further part being driven by the distributor member by connection means so that as the distributor member is moved axially within the body, the phase relationship between the signals produced by the two sensors will vary, and electric circuit means for measuring said phase relationship to provide an indication of the axial position of said position of said distributor member.
In the accompanying drawings; Figure 1 is a sectional side elevation of one example of the apparatus, Figure 2 is a section of a part of the apparatus seen in Figure 1 taken along a different radial plane, Figures 3 and 4 are sections through parts of the apparatus seen in Figures 1 and 2, Figure 5 is a section through part of the apparatus seen in Figure 1, Figures 6 is a diagrammatic illustration of the apparatus showing one example of the transducer, Figures 7 and 8 are side views in the direction of the arrows B and A of Figure 6 and Figure 9 is a block diagram of a control system.
Referring to Figure 1 of the drawings, the apparatus comprises a body part generally indicated at 10 and which conveniently is formed by a generally cup-shaped portion 11, which may be formed from a light alloy the open end of which is closed by a closure portion 12, this being formed from steel. The body portion 10 is provided with apertured lugs 1 3 whereby in use the apparatus can be secured to the engine with which it is associated.
The body portion 11 mounts a rotary drive shaft 14 which in use, is coupled to a drive member of the associated engine so that the drive shaft is rotated in synchronism with the engine.
The drive shaft 14 extends into the generally cylindrical chamber 1 5 defined by the two body portions and has an enlarged cup-shaped portion 1 4a within the chamber. The enlarged portion is provided with a pair of diametrically disposed slots 1 6. The enlarged portion of the drive shaft is hollow and at its end remote from the smaller diameter portion of the shaft the inner surface is of right cylindrical form and locates about a spigot portion 17 defined by the body portion 12. The remainder of the interior surface of the enlarged portion of the drive shaft tapers for a purpose which will be described.Moreover, the drive shaft is provided with a counter bore 1 8. An oil seal 19 is provided at the outer end of the body portion 10 for engagement with the drive shaft 14 and a sleeve bearing 20 supports the shaft for rotation, the shaft being given additional support by the spigot 1 7. The shaft is located against axial movement by a thrust surface which engages with the end surface defined between the two portions of the shaft. The thrust surface is defined by an annular plate 21 which surrrounds the drive shaft and which additionally serves as an end closure for a low pressure fuel supply pump 22.
The rotor 22a of the supply pump is carried by the drive shaft 14 and the rotor in turn carried vanes which co-operate with an eccentrically disposed surface on a stator ring 22b which is carried within a body portion 11. The low pressure pump has a fuel inlet 23 connected to a fuel inlet in a housing secured to the body portion 11 and a fuel outlet 24. Moreover, a relief valve 25 is provided to ensure that the output pressure of the pump remains within desired limits, the relief valve being connected between the inlet and the outlet.
Formed in the body portion 12 is a cylindrical bore 26 in which is fixed a sleeve 27. The sleeve 27 accommodates an angularly and axially moveable distributor member 28 which projects into the chamber 1 5 and has an enlarged head portion lying within the chamber. Formed in the head portion of the distributor member is a transversely extending bore 29 in which is located a pair of pumpiing plungers 30. The bore 29 communicates with a blind passage 31 formed in the distributor member and which at its end within the head portion is sealed by means of a plug. As is more clearly shown in Figures 2, 3 and 4 the passage 31 communicates with a pair of diametrically disposed longitudinal slots 32 formed in the periphery of the distributor member and communicating with the passage 31 by means of a single or a plurality of connecting passages.The passage 31 also communicates with a further longitudinal slot 33 formed in the periphery of the distributor member and this slot communicates in turn with a plurality of outlet ports 34 formed in the sleeve 27 and as seen in Figure 2, the outlet ports 34 communicate with outlets 35 respectively in the body portion 12.
Each outlet incorporates a conventional form of delivery valve 36. The slots 32 register in turn with inlet ports 37 formed in the sleeve 27 and communicating with a circumferential groove 38 formed in the periphery of the sleeve. The groove 38 as shown in Figure 1, communicates with the outlet 24 of the low pressure pump 22 by way of an on/off valve 39 conveniently controlled by an electromagnetic device 40. If desired a single slot 32 may be provided with the number of inlet ports being equal to the number of outlets.
Surrounding the head portion of the distributor member 28 is an annular cam ring 41 on the internal peripheral surface of which are formed pairs of diametrically disposed cam lobes. In the particular example three pairs of lobes are provided since the apparatus is intended to supply fuel to a six cylinder engine. Moreover, the cam ring 41 is angularly movable about the axis of rotation of the distributor member by means of a fluid pressure operable device generally indicated at 42 and connected to the cam ring by way of a radially disposed peg 43. The device 42 conveniently includes a resiliently loaded piston housed within a cylinder to one end of which liquid under pressure can be supplied to act on the piston to urge the piston against the action of its resilient loading.
Positioned at the outer ends of the plungers are a pair of followers each of which comprises a roller 44 carried in a shoe 45. The followers are retained axially relative to the distributor member by a pair of side plates 46, 47 which are secured to the side faces of the head portion of the distributor member. Conveniently as shown in Figure 5, the side plates are of annular form and have a pair of outwardly extending tongues 48, which locate in the slots 16 formed in the enlarged portion of the drive shaft. In Figure 5 the plate 46 is seen, the plates acting to transmit rotary motion to the distributor member from the drive shaft. The shoes 45 are also located within the aforesaid slots 1 6 and the rotary motion is transmitted to the shoes directly by the drive shaft.Moreover, the circumferential side faces of the shoes are provided with circumferentially extending projections 49 the radially outer surfaces of which ara tapered to co-operate with the tapered surface formed on the internal surface of the enlarged portion of the drive shaft 14.
In use, when fuel is supplied to the bore 29, upon registration of a groove 32 with an inlet passage 37, the plungers 30 are moved outwardly by the fuel pressure and in so doing impart outward movement to the shoes 45 and the rollers 44. The outward movement is limited by the abutment of the tapered surfaces on the shoes and shaft and by moving the distributor member axially the extent of outward movement can be varied. Thus the amount of fuel supplied to the bore 29 can be controlled and this in turn determines the amount of fuel delivered through an outlet when the plungers 30 are moved inwardly by a pair of cam lobes.
The axial position of the distributor member can be varied mechanically or hydraulically. In the arrangement described the variation is achieved by varying the pressure within a chamber 50 defined by the end of the bore 26 in the body portion 12. The end of the bore 26 is closed by a closure member and fuel under pressure is supplied to the chamber 50 by way of a restricted orifice 51 carried by the sleeve 27. The orifice communicates with the outlet 24 of the pump 22.
Fuel is allowed to escape from the chamber 50 so that the pressure in the chamber can be controlled, by way of an electromagnetically controlled valve 52. Moreover, the distributor member is biassed by means of a coiled compression spring 53 which is housed within the blind bore 18 formed in the drive shaft 14.
The spring 53 acts between the drive shaft and the distributor member and urges the distributor member against the action of fuel under pressure in the chamber 50 which acts on the distributor member.
By varying the pressure in the chamber 50 using the valve 52 so the axial position of the distributor member can be varied and therefore the amount of fuel delivered each time the plungers move inwardly can be varied.
For a given axial setting the distributor member and ignoring leakage, the amount of fuel delivered by the plungers will remain the same through the speed range of the associated engine and an indication of the axial setting of the distributor member, is provided by transducer means.
One form of transducer means will be described with reference to Figures 6, 7 and 8. A pair of probes 54, 55 are provided which sense the passage as the shaft rotates of two series of markings respectively. Each tirne a marking passes a sensor or probe, a signal is produced by that probe.
The first series of markings 56 are formed on the part 1 4a of the drive shaft and each marking comprises an axial groove.
The second series of markings is formed by a plurality of axially extending ridges 57 formed on the peripheral surface of a part in the form of a sleeve 58 carried by the distributor member. The sleeve is biassed by a coiled compression spring 59 into contact with a fixed stop 60 and an inclined slot and pin connection is provided between the distributor member and the sleeve.
In the particular example the distributor member is provided with an inclined slot 61 with which is engaged a pin 62 carried by the sleeve. As the distributor member is moved axially, the sleeve will retain its axial position in contact with the stop 60 and it will rotate with the distributor member but the relative angular position of the sleeve and distributor member will vary as a result of the helical slot and pin connection. The pulses provided by the probes 54 and 55 will have a phase relationship which varies the axial movement of the distributor member. The transducer is calibrated by adjustment of the stop 60.
As shown in Figure 9, the signals derived from the sensors or probes 54, 55 are supplied to a phase displacement measuring circuit 61 from which is obtained a signal indicative of the axial position of the distributor member and hence a signal which represents the amount of fuel being supplied by the apparatus to the associated engine. This signal is supplied to a control circuit 62 which also receives a signal at the terminal 63 representing the demanded fuel signal and the output of the circuit 62 controls the setting of the valve 52.
Temperature variation can cause variation in the amount of fuel supplied by the apparatus and one way of compensating for temperature variation is to modify the signal appearing at the output of the circuit 61. This can be achieved by phase delay circuit 65 which may for example receive a temperature signal produced as for a result of the measurement of the resistance of for example the windings in the electromagnetic valves.
An alternative way of achieving temperature compensation is to interpose between the circuit 61 and one of the sensors, a phase displacement circuit 64 which is responsive to the temperature of the body of the apparatus and which will cause a compensating phase shift so that the signal obtained at the output of the circuit 61 will be a true indication of the amount of fuel being supplied by the apparatus to the associated engine.
Throughout the specification the term "markings" has been used, and in the example described the markings have been grooves or ridges. The sensors or probes in this case are of a capacitive nature. It will be understood however that other forms of probe and marking can be used. For example, the markings may be of magnetic nature with the sensors or probes being responsive to the magnetic flux produced as the markings pass the probes.
The distributor member position which gives pulse coincidence is preferably chosen so that it corresponds to the maximum fuel position. This is to provide the maximum accuracy since changes in the speed of rotation will effect the output signal of the circuit 61 at positions other than that which gives pulse coincidence.

Claims (8)

Claims
1. A liquid fuel injection pumping apparatus for supplying fuel to an internal combustion engine and of the kind comprising a body part, a rotary distributor member mounted in the body part and arranged in use to be driven in timed relationship with an engine with which the apparatus is associated, a transverse bore formed in the distributor member, a plunger in said bore, a cam follower positioned at the outer end of said plunger for engagement with a cam surface formed on a cam ring surrounding the distributor member, stop means for limiting the outward movement of the plunger, said stop means comprising complementary inclined surfaces on the follower and a part respectively, said part being rotatable with the distributor member but axially fixed within the body part whereby as the distributor member is moved axially within the body part the amount by which the plunger can move outwardly whilst fuel is supplied to the bore will vary, passage means for conveying fuel to and from said bore, during rotation of the distributor member, said distributor member being axially movable within the body part, means for varying the axial setting of the distributor member within the body part, transducer means for providing a signal indicative of the axial setting of the distributor member, said transducer means comprising a first series of markings on said part, a second series of markings on a further part rotatable with the distributor member, first and second sensors mounted in the body of the apparatus for providing electrical signals upon passage of the markings past the sensors, said further part being driven by the distributor member by connection means so that as the distributor member is moved axially within the body, the phase relationship between the signals produced by the two sensors will vary, and electric circuit means for measuring said phase relationship to provide an indication of the axial position of said position of said distributor member.
2. An apparatus according to claim 1 in which said connection means comprises a pin and helical slot connection, said further part being in the form of a sleeve surrounding the distributor member.
3. An apparatus according to claim 2 including resilient means biassing said sleeve into contact with a stop carried by the body part.
4. An apparatus according to claim 2 or claim 3 in which the helical slot is formed in the distributor member.
5. An apparatus according to claim 1 in which said electrical circuit means includes a phase displacement measuring circuit.
6. An apparatus according to claim 5 including means for compensating for temperature, the signal produced by said circuit.
7. An apparatus according to claim 6 in which said temperature compensating means comprises a phase delay circuit interposed between said circuit and one of said sensors, said phase delay circuit being provided with a control signal which varies in accordance with the temperature of the apparatus.
8. A liquid fuel injection pumping apparatus comprising the combination and arrangement of parts substantially as hereinbefore described with reference to the accompany drawings.
GB8101735A 1980-02-14 1981-01-21 Liquid fuel injection pumping apparatus Expired GB2070151B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8004954 1980-02-14

Publications (2)

Publication Number Publication Date
GB2070151A true GB2070151A (en) 1981-09-03
GB2070151B GB2070151B (en) 1983-09-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8101735A Expired GB2070151B (en) 1980-02-14 1981-01-21 Liquid fuel injection pumping apparatus

Country Status (2)

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FR (1) FR2476225A1 (en)
GB (1) GB2070151B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920558A (en) * 1982-07-26 1984-02-02 Hitachi Ltd Fuel metering and supplying device of injection pump

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT965124B (en) * 1972-08-25 1974-01-31 Fiat Spa ADVANCE VARIATOR WITH ELECTRONIC CONTROL FOR INJECTION PUMPS
GB2037365B (en) * 1978-11-25 1982-12-08 Lucas Industries Ltd Liquid fuel injection pumping apparatus

Also Published As

Publication number Publication date
GB2070151B (en) 1983-09-21
FR2476225A1 (en) 1981-08-21
FR2476225B1 (en) 1983-12-23

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PCNP Patent ceased through non-payment of renewal fee