GB2086491A - Rotary fuel injection pump - Google Patents

Rotary fuel injection pump Download PDF

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Publication number
GB2086491A
GB2086491A GB8128586A GB8128586A GB2086491A GB 2086491 A GB2086491 A GB 2086491A GB 8128586 A GB8128586 A GB 8128586A GB 8128586 A GB8128586 A GB 8128586A GB 2086491 A GB2086491 A GB 2086491A
Authority
GB
United Kingdom
Prior art keywords
fuel
signal
bore
pump
cam
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
GB8128586A
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GB2086491B (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
Priority to GB8128586A priority Critical patent/GB2086491B/en
Publication of GB2086491A publication Critical patent/GB2086491A/en
Application granted granted Critical
Publication of GB2086491B publication Critical patent/GB2086491B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • 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 rotary type fuel injection pump includes a rotary distributor member 11 mounting a plunger 14 which can be moved inwardly by a cam 16 to deliver fuel through an outlet 21.The fuel flow to the bore 13 containing the plunger is controlled by a valve 24 which is itself controlled by a signal processing circuit. The pump incorporates three transducers 27, 29, 30. The first of these is mounted on the body and provides a signal each time a mark 28 on a rotary part of the pump passes the transducer. The second of the transducers also provides a signal when the mark passes the transducer but it is mounted on the cam 16 which is angularly adjustable. The third transducer is a pressure transducer which provides a signal representative of the pressure within the bore. From the signals provided by the transducers and a knowledge of the profiles of the leading flanks of cam lobes on the cam, the processing circuit can control the valve 24 so that the desired quantity of fuel is delivered by the pump. Signals from the processing circuit can also control a valve 26 which, in turn, regulates the flow of liquid to a timing control cyclinder. <IMAGE>

Description

SPECIFICATION Rotary fuel injection pump This invention relates to a rotary type fuel injection pump for supplying fuel to an internal combustion engine, the pump being of the kind including a body part, a rotary member in the body part and which in use is driven in timed relationship with the associated engine, a plunger slideable in a bore formed in the rotary member, a cam having a cam lobe for imparting inward movement to the plungerto displace fuel from the bore as the rotary member rotates, passage means in the rotary member and body part for conveying fuel dispiaced from the bore to an outlet in the body part, a source of fuel under pressure, means for conveying fuel to the bore from the source and further means for varying the quantity of fuel supplied to the bore.
In order to provide the degree of control of combustion which is necessary to meet engine exhaust emission regulations and to provide economical operation of the engine, it is considered that an electronic control system should be utilised to control the injection pump in particular, the adjustment of said further means. In order to be able to effect control, the control system needs to be supplied with various signals representing pump operating parameters for example the speed of operation of the pump and the quantity of fuel delivered by the pump.
The generation of a signal representing actual delivery of fuel is not easy without adding to the complexity of the pump. For example it is possible to provide a moveable shuttle the displacement of which is equal to the amount of fuel supplied to the injection pump and to provide a transducer which provides a signal indicative of the movement of the shuttle. The extra complexity of the pump is due to the need to provide various passages and ports through which the supply of fuel to and from the opposite ends of the cylinder containing the shuttle can be switched at each filling stroke of the pump.
The object of the present invention is to provide a pump of the kind specified in a simple and convenient form.
According to the invention a pump of the kind specified comprises a pressure transducer for providing a signal indicative of a pressure rise in said bore as occurs when the plunger is moved inwardly, a further transducer fixed relative to said cam for providing a further signal indicative of the passage of a mark on the rotary member or a part rotable therewith and signal processing means which receives said signals and which on the basis of the speed of rotation of the member and the contour of the leading flank of the cam lobe provides a signal indicative of the amount of fuel delivered by the pump.
An example of a pump in accordance with the invention will now be described with reference to the accompanying drawings in which: Figure lisa sectional side elevation of the pump, Figure2 is a pulse diagram illustrating signals obtained from the pump and Figure 3 is a block diagram of a control system for the pump.
Referring to Figure 1 of the drawings the pump comprises a multi- part body 10 in which is journaled a rotary cylindrical distributor member 11 which is coupled to so as to rotate with, a drive shaft 12 extending from the body part and arranged in use, to be driven in timed relationship with the associated engine.
Formed in the distributor member is a transverse bore 13 in which is mounted a pair of pumping plungers 14. At their outer ends the plungers engage shoes 15 respectively which in turn carry rollers 16 for engagement with the internal peripheral surface of a cam ring 17 mounted for angular movement within the body part. Formed on the cam ring are a plurality of equi- angularly spaced cam lobes (not shown). The shoes 15 are mounted for radial movement within slots formed in an enlarged portion 18 ofthe drive shaft 12.
Communicating with the bore 13 is a longitudinal passage 19 which communicates with an outwardly extending delivery passage 20 adapted to register in turn as the distributor member rotates, with a plurality of outlet ports 21 which in use, are connected to the injection nozzles of the associated engine. Also communicating with the passage 19 are a plurality of radially disposed inlet passages 22 only one of which is shown and these can register in turn with an inlet port 23 formed in the body part and which can be brought into communication by opening an electrically controlled valve 24, with a source 25 of fuel under pressure. The source of fuel conveniently comprises a vane type feed pump driven from the distributor member or the drive shaft.In operation, as the rollers engage the leading flanks of the cam lobes, inward movement will be imparted to the plungers 14 and fuel will be displaced from the bore 13 and will flow along the passage 19 to the delivery passage 20 and to one of the outlets 21. During this time the inlet port 23 is out of register with the inlet passages and fuel is delivered to one combustion space of the associated engine. As the rollers reach the crests of the cam lobes, delivery of the fuel ceases and during continued rotation of the distributor member the passage 20 is moved out of register with an outlet and one of the inlet passages 22 moves into register with the inlet port 23. If now the valve 24 is opened fuel can flow from the source 25 to the bore 13 to effect outward movement of the plungers and the amount of such movement is determined by the time during which the valve 24 is opened.As the distributor member continues to rotate the cycle as described is repeated and fuel is supplied to the outlets in turn.
As is conventional practice, the cam ring 17 is angularly adjustable to enable the timing of delivery of fuel to the engine to be varied and the adjustment ofthe cam ring is effected by means of a fluid pressure operable piston 25A which is coupled to the cam ring. The piston is contained within a cylinder and a further electro-magnetically operable valve 26 is provided to control the flow of liquid conveniently fuel, from the source 25, to the cylinder.
The control of the valves 24 and 26 is effected by means of an electronic control system to be described, which receives a demand signal from the driver of the vehicle of which the engine forms part and determines from signals supplied to it, the instant at which the valve 24 should be opened and the timing of delivery of fuel so that it can control the operation of the valve 26. In orderto effect the control the electronic control system must be provided with a signal indicative of the speed of the associated engine and signals indicative of the actual instant at which fuel is delivered by the pump and the quantity of fuel which is being delivered by the pump.From the signals the electronic control system can effect the required adjustments in order to ensure that the quantity of fuel being supplied to the engine is correct and that the timing of delivery is also correct.
In order to provide the signals three transducers are mounted on the pump. The first transducer referenced 27, is fixed within the body part 10 in close proximity to the surface of the enlarged portion 18 of the drive shaft 12. Conveniently it is of the variable reluctance type and it senses the passage of equi-angularly spaced grooves 28 on the surface of the enlarged portion 18 of the drive shaft.
For convenience when studying Figure 2 the transducer 27 has been assigned the reference letter A.
A similartransducer 29 is positioned along side the transducer 27 but it is carried by an arm extending from the cam ring 17. For convenience this transducer is assigned the reference letter B.
In addition to the two transducers mentioned above a pressure transducer indicated at 30 is provided and this is secured within an aperture in the body part the inner end of the aperture being exposed to the periphery of the distributor member by way of the port 31. The port 31 is positioned so that it is in register with an inlet passage 22 at the same time that the delivery passage 20 is in register with an outlet 21. For convenience the pressure transducer 30 is assigned the reference letter C. The transducer 30 provides a signal indicative of the pressure within the bore 13 during inward movementofthe plungers 14.
Turning now to Figure 2. This figure shows the three reference letters referred to above and the wave forms obtained from the respective transducers. The signal provided by the transducer 27 (A) is the signal which conveniently is used to provide the speed signal to the electronic control system. The signal from the transducer 29 (B) is similar to that provided by transducer 27 and whilst it can occur at the same time, before or after the signal produced by the transducer 27, it is the example, arranged to always occur after the signal provided by the transducer 27. The interval therefore between the signals once the pump has been calibrated, provides an indication of the position of the cam ring and it is used in the electronic control system to ensure that the setting of the cam ring is correct.The signal provided by the transducer 30 (C) is of less precise nature since the actual pressure within the various passages is influenced to an appreciable extent by the condition of the injection nozzles. Nevertheless, it is possible to obtain from the rising portion of this signal a sufficiently accurate indication of the start of delivery of fuel. The interval between the signals provided by the transducers 29 and 30, once the pump has been calibrated, provides an indication of the position on the leading flank of the cam lobe, at which the roller engages the cam lobe and the plunger starts to move inwardly. The profile of the leading flank of the cam lobe is known and information relative to this stored in a processing circuit. It is possible therefore to obtain from the processing circuit a signal indicative of the quantity of fuel delivered by the pump.This signal can be applied to the electronic control circuit which can effect appropriate adjustment of the valve 24 should this be necessary, in order to ensure that the correct amount of fuel is supplied to the engine.
The pump described above whilst it requires additional components, these are in general of an electrical nature. The pressure transducer 30 is a comparatively simple item and the need to provide the passage 31 represents no practical problems so far as the mechanical construction of the pump is concerned.
Turning now to Figure 3 the signals generated by the transducers 27, 29 are supplied to pulse shaping circuits 32,33 respectively which are zero crossing detectors. Pulses are therefore provided at the outputs of the shaping circuits each time the input signals pass through zero. The signal provided by the transducer 30 is supplied to a comparator 34 which provides an output pulse whenever the signal provided by the transducer 30 exceeds a predetermined value.
Three gate circuits 35,36,37 are provided each of which at its input is supplied with a signal provided by a clock pulse generator 38. Gate circuit 35 is controlled by the pulses at the output of the circuit 32 and is opened by one pulse and closed by the following pulse. The clock pulses which pass through the gate 35 whilst it is open are supplied to a counter 39. The count value provided by this counter is an indication of the speed remembering that as the speed increases the count value will decrease.
The gate circuit 36 is opened by the pulses supplied by the circuit 32 and closed by the pulse supplied by the circuit 33. The clock pulses which pass through the gate whilst it is open are supplied to a counter, the count value of which is an indication of the relative position of the transducers 27 and 29. The count value will increase as the relative angular setting of the transducers increases and the count value will also be dependent upon the speed.
The gate circuit 37 is opened by pulses supplied by the circuit 33 and closed by pulses supplied by the circuit 34. The clock pulses which pass through the gate whilst it is open are counted by a counter 41 and the count value is an indication as previously explained of the position on the leading flank of the cam lobe at which the roller engages the cam lobe and the plunger starts to move inwardly.
The signal provided by the counter 39 is supplied to a processing circuit 42 the output of which controls the operation of the valves 24 and 26. The circuit 42 also receives a demand signal and may be provided with signals representing various engine operating parameters. The signals provided by the counters 40 and 41 are supplied to dividing circuits 43, 44 respectively which also receive the signal provided by the counter 39.
The signal provided by the circuit 43 represents the position of the cam ring 17 in terms of degrees relative to the position of the transducer 27 whilst the signal provided by the circuit 44 represents fuel quantity delivered by the pump. The processing circuit adjusts the values 24 and 26 to ensure that the desired quantity of fuel is supplied to the engine at the correct time.

Claims (5)

1. A rotary type fuel injection pump for supplying fuel to an internal combustion engine comprising a body part, a rotary member in the body part and which in use is driven in timed relationship with the associated engine, a plunger slidable in a bore formed in the rotary member, a cam having a cam lobe for imparting inward movement to the plunger to displace fuel from the bore as the rotary member rotates, passage means in the rotary member and body part for conveying fuel displaced from the bore to an outlet in the body part, a source of fuel under pressure, means for conveying fuel to the bore from the source, further means for varying the quantity of fuel supplied to the bore, a pressure transducer for providing a signal indicative of a pressure rise in said bore as occurs when the plunger is moved inwardly, a further transducer fixed relative to said cam for providing a further signal indicative of the passage of a mark on the rotary member or a part rotatable therewith and signal processing means which receives said signals and which on the basis of the speed of rotation of the member and the contour of the leading flank of the cam lobe provides a signal indicative of the amount of fuel delivered by the pump.
2. A pump according to Claim 1 including an additional transducer fixed in said body part for providing an additional signal indicative of the passage of said mark.
3. A pump according to Claim 2 in which said signal processing means derives from said additional signal a signal representative of the pump speed, from said further signal and said additional signal a signal representative of the position of the cam and from said first mentioned signal and said further signal a signal indicative of the position of the point of engagement of the plunger or a part associated therewith, with the cam.
4. A pump according to Claim 1 in which the means for varying the quantity of fuel supplied to the bore comprises an electrically controlled valve interposed between the bore and a source of fuel under pressure.
5. A rotary type fuel injection pump comprising the combination and arrangement of parts substantially as hereinbefore described with reference to the accompanying drawings.
GB8128586A 1980-10-25 1981-09-22 Rotary fuel injection pump Expired GB2086491B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8128586A GB2086491B (en) 1980-10-25 1981-09-22 Rotary fuel injection pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8034446 1980-10-25
GB8128586A GB2086491B (en) 1980-10-25 1981-09-22 Rotary fuel injection pump

Publications (2)

Publication Number Publication Date
GB2086491A true GB2086491A (en) 1982-05-12
GB2086491B GB2086491B (en) 1985-08-07

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GB8128586A Expired GB2086491B (en) 1980-10-25 1981-09-22 Rotary fuel injection pump

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095190A2 (en) * 1982-05-26 1983-11-30 Hitachi, Ltd. Electronically controlled injection system for internal combustion engines
US4446836A (en) * 1981-10-23 1984-05-08 Lucas Industries Public Limited Company Fuel injection pumping apparatus
GB2136885A (en) * 1983-03-19 1984-09-26 Bosch Gmbh Robert Fuel injection system for an internal combustion engine
EP0135460A2 (en) * 1983-07-25 1985-03-27 Stanadyne Inc. Electronic fuel control system for a fuel injection pump
EP0527659A2 (en) * 1991-08-14 1993-02-17 Honda Giken Kogyo Kabushiki Kaisha Fuel injection control system for internal combustion engines
WO1993003270A1 (en) * 1991-08-06 1993-02-18 Lucas Industries Public Limited Company Fuel pumping apparatus
EP0585746A2 (en) * 1992-08-20 1994-03-09 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
FR2698129A1 (en) * 1992-11-19 1994-05-20 Bosch Gmbh Robert Fuel injection device for internal combustion engines.
GB2283540A (en) * 1993-11-05 1995-05-10 Lucas Ind Plc Fuel injection pumping apparatus
DE19712557B4 (en) * 1996-03-25 2005-05-04 Mitsubishi Jidosha Kogyo K.K. Distributor fuel injection pump for an internal combustion engine

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446836A (en) * 1981-10-23 1984-05-08 Lucas Industries Public Limited Company Fuel injection pumping apparatus
EP0095190A3 (en) * 1982-05-26 1985-11-06 Hitachi, Ltd. Electronically-controlled system for supplying fuel into cylinder
EP0095190A2 (en) * 1982-05-26 1983-11-30 Hitachi, Ltd. Electronically controlled injection system for internal combustion engines
GB2136885A (en) * 1983-03-19 1984-09-26 Bosch Gmbh Robert Fuel injection system for an internal combustion engine
US4554903A (en) * 1983-03-19 1985-11-26 Robert Bosch Gmbh Fuel injection apparatus for injecting a fuel mixture comprising at least two components
EP0135460A2 (en) * 1983-07-25 1985-03-27 Stanadyne Inc. Electronic fuel control system for a fuel injection pump
EP0135460A3 (en) * 1983-07-25 1987-02-04 Stanadyne Inc. Electronic fuel control system for a fuel injection pump
WO1993003270A1 (en) * 1991-08-06 1993-02-18 Lucas Industries Public Limited Company Fuel pumping apparatus
EP0684374A3 (en) * 1991-08-14 1998-03-11 Honda Giken Kogyo Kabushiki Kaisha Fuel injection control system for internal combustion engines
EP0527659A2 (en) * 1991-08-14 1993-02-17 Honda Giken Kogyo Kabushiki Kaisha Fuel injection control system for internal combustion engines
EP0527659A3 (en) * 1991-08-14 1993-08-04 Honda Giken Kogyo Kabushiki Kaisha Fuel injection control system for internal combustion engines
EP0585746A2 (en) * 1992-08-20 1994-03-09 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
US5485822A (en) * 1992-08-20 1996-01-23 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
EP0585746A3 (en) * 1992-08-20 1997-09-10 Toyota Motor Co Ltd Fuel injection controller for use in an internal combustion engine
US5697338A (en) * 1992-08-20 1997-12-16 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
US5848581A (en) * 1992-08-20 1998-12-15 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
EP0911508A2 (en) * 1992-08-20 1999-04-28 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
EP0911508A3 (en) * 1992-08-20 1999-11-24 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
EP0911507A3 (en) * 1992-08-20 1999-11-24 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
FR2698129A1 (en) * 1992-11-19 1994-05-20 Bosch Gmbh Robert Fuel injection device for internal combustion engines.
GB2283540A (en) * 1993-11-05 1995-05-10 Lucas Ind Plc Fuel injection pumping apparatus
DE19712557B4 (en) * 1996-03-25 2005-05-04 Mitsubishi Jidosha Kogyo K.K. Distributor fuel injection pump for an internal combustion engine

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980922