GB2076905A - Control device for multi-cylinder fuel-injection internal combustion engines - Google Patents

Control device for multi-cylinder fuel-injection internal combustion engines Download PDF

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Publication number
GB2076905A
GB2076905A GB8115791A GB8115791A GB2076905A GB 2076905 A GB2076905 A GB 2076905A GB 8115791 A GB8115791 A GB 8115791A GB 8115791 A GB8115791 A GB 8115791A GB 2076905 A GB2076905 A GB 2076905A
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GB
United Kingdom
Prior art keywords
control
group
injection pump
control rod
pump elements
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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
GB8115791A
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GB2076905B (en
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Friedmann and Maier AG
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Friedmann and Maier AG
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Publication date
Application filed by Friedmann and Maier AG filed Critical Friedmann and Maier AG
Publication of GB2076905A publication Critical patent/GB2076905A/en
Application granted granted Critical
Publication of GB2076905B publication Critical patent/GB2076905B/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
    • 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
    • F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance
    • F02D1/12—Transmission of control impulse to pump control, e.g. with power drive or power assistance non-mechanical, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/28—Mechanisms therefor
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively

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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

An injection pump element (3, 4, 5, 6) is associated with each engine cylinder. The throughput of each pump element is controlled by rotation of a pump piston having an inclined control edge. The pump elements are divided into a first group (3 and 5) and a second group (4 and 6) and an individual control rod (1 and 2) is associated with each group. One of the control rods (1) is connected to the final control element (7) of a controller and the other control rod (2) is arranged so that it can be coupled to or uncoupled from the control rod (1). The control rods (1 and 2) are disposed parallel to each other on opposite sides of the injection pump elements and the uncoupled rod (2) can be moved to a predetermined position, e.g. a zero delivery position, such as by an electromagnet or fluid pressure operated piston and cylinder assembly when for instance the engine is idling. <IMAGE>

Description

SPECIFICATION Control device for multi-cylinder fuel-injection internal combustion engines The invention relates to a control device for multicylinder fuel-injection internal combustion engine.
More particularly the invention concerns control devices in which there is associated with each engine cylinder an injection pump element, the throughput of which is controlled by rotating the pump piston which is provided with an inclined control edge, wherein the injection pump elements are divided into a first and a second group, and with each group there is associated an individual control rod which acts on all injection pump elements of the group, and in which only the control rod of the first group is connected to a final control element of a controller, and the control rod of the second group can be selectively coupled to and uncoupled from the control rod of the first group, and further wherein the uncoupled control rod of the second group can be brought into a predetermined position, in particulay to zero delivery.
Such control devices are known, and serve for disconnecting a group of cylinders when the engine is idling. When in its idling or partly-loaded condition a fuel-injection internal combustion engine operates inefficiently, and in order for a group of injection pump elements to be set to zero delivery, the fuel feed to the associated group of engine cylinders is cut off, and only the remaining engine cylinders operate. By this means, the emission behaviour of the engine is also improved, i.e. combustion is improved and less harmful materials are exhausted to atmosphere. In known control devices of this type, the control rod is formed in many parts, each part of the control rod co-operating only with one group of cylinders. Such multipart control rods are of extremely complicated construction and are therefore costly and subject to faults.Because of the complicated construction of such multipart control rods, these can only be used for multi-position injection pumps, in which all pump elements are disposed in a common casing.
The object of the invention is to provide a simpler control device for multi-cylinder fuel-injection internal combustion engines which allows a group of engine cylinders to be disabled.
According to the invention, there is provided a control device for multi-cylinder fuel-injection internal combustion engines, in which an injection pump element is associated with each engine cylinder, the throughput of each pump element being controllable by rotation of a pump piston having an inclined control edge, the injection pump elements being divided into a first and a second group, and there being associated with each group an individual control rod which acts on all injection pump elements of the respective group, the control rod of the first group being connected to a final control element of a controller, and the control rod of the second group being arranged so that it can be selectevely coupled to or uncoupled from the control rod of the second group can be brought into a predetermined position, in particular to zero delivery, and wherein the control rods are disposed parallel to each other on opposite sides of the injection pump elements.
In this manner, simple control rods can be used which are coupled and uncoupled only to and from each other. Such a construction can therefore be used both for multi-position injection pumps and for injection pump devices in which with each engine cylinder there is associated a separate pump-nozzle unit consisting of an injection pump and nozzle combined into one integral unit, and which is inserted into the cylinder head. Because of the simple construction of the control rods it is readily possible to guide the control rods over the total engine length, as the control rods are not protected by a casing.As the control rods are disposed on the two sides ofthe injection pump elements, the control sleeves can be disposed at the same height for all injection pump elements, so that the two control rods lead to no increase in the structural height. By arranging the control rods of the individual groups parallel to each other, any desired cylinders can be combined into a common group, and in this manner a uniform thermal loading of the engine block over the totai length thereof is ensured when individual cylinders are disconnected.
According to one embodiment, the two control rods can be coupled together so that they move in the same direction, for which the control edges of the pump pistons of the injection pump elements of the second group have an inclination which is opposite to the inclination of the control edges of the injection pump elements of the first group. In this respect, the disadvantage exists that the injection pump elements of the various groups must be formed differently.
However, according to a preferred embodiment of the invention, the two control rods can be coupled together so that they move in opposite directions, in which case the control edges of the pump pistons of the injection pump elements of the second group and the control edges of the injection pump elements of the first group are inclined in the same direction. This leads to the advantage that the pump pistons of all pump elements can be of the same construction. In such an embodiment, it is desirable for the two control rods to be coupled together by means of a double-armed lever having equal arm lengths and pivotable about a stationary pivot.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, wherein Figures 1 to 3 show respectively three embodiments of a control device for multi-cylinder fuel-injection internal combustion engines according to the invention.
In the embodiment of Figure 1, two control rods 1 and 2 are provided on opposite sides of pump elements 3, 4, 5 and 6, only the control sleeves 3', 4', 5' and 6' of these pump elements being shown. The control rod 1 is operated by a final control element 7 of a controller, not shown. The control rod 2 is coupled to the control rod 1 by a double-armed lever 9 which can swivel about a stationary pivot 8, so that the rods 1 and 2 move in opposite directions. The right hand end of the double-armed lever 9 engages a pin 10 rigidly fixed to the control rod 1. The left hand end of the lever 9 engages a pin 11 which is rigidly disposed on a sleeve 13 slidable on a rod 12 which is rigidly fixed to the control rod 2. The rod 12 has an extention 14 against which the sleeve 13 is urged by a compression spring 15.The sleeve 13 is fixed in its position in the axial direction of the control rod 2 by the spring 15 and extension 14, and the control rod 2 is consequently slid by means of the double-armed lever 9 in the opposite direction to the control rod 1, so that all control sleeves 3', 4', 5' and 6' rotate in the same direction. This is the situation during normal operation of the engine.
The control rod 1 engages the control sleeves 3' and 5' of a first group of injection pump elements 3 and 5. The control rod 2 engages the control sleeves 4' and 6' of a second group of injection pump elements 4 and 6. By overcoming the force of the spring 15 by means of an electromagnet 16, the control rod 2 can be drawn against a zero stop 17.
This is done during the idling state, with the result that the cylinders associated with the second group of injection pump elements 4 and 6 are disconnected, and only the engine cylinders associated with the first group of injection pump elements 3 and 5 operate. A normal full-load limiting stop is indicated by 18.
As the control rods 1 and 2 are slid in opposite directions in the arrangement of Figure 1, the control sleeves 3', 4' 5' and 6' are rotated in the same direction, and all pump pistons can therefore be constructed with sloping control edges inclined in the same direction.
In the arrangement of Figure 2, the control rod 1 is provided with a crosspiece 19 which embraces the control rod 2. The control rod 2 has a shoulder 20, and a compression spring 21 acts between the crosspiece 19 and shoulder 20 to urge the crosspiece 19 against a further shoulder 22 on the control rod 2.
The control rod 2 is coupled to the control rod 1 by the spring 21 and shoulder 22 so that they move in the same direction, during normal engine operation.
The control sleeves 4' and 6' of the second group of injection pump elements 4 and 6 are therefore rotated in an opposite direction to the control sleeves 3', 5' of the first group of injection pump elements 3 and 5, and the pump pistons of the two groups must therefore have control edges inclined in opposing directions. An electromagnet 16 is again provided, by means of which the control rod 2 can be drawn against a zero stop 17 by overcoming the spring 21,so that the cylinders associated with the injection pump elements 4 and 6 can be disconnected during idling.
In the arrangement of Figure 3, again in the same manner as in the arrangement of Figure 2 the control rod 2 is entrained by the control rod 1 by way of a crosspiece 23, and thus moves in the same direction as the control rod 1. In this case, the control rod 2 is rigidly connected to a piston 24 which is slidable in a cylinder 25 rigidly connected to the crosspiece 23.
During normal operation of the engine, the piston is urged buy a compression spring 26 againstthe end 27 of the cylinder 25, and thus the control rod 2 is coupled to the control rod 1 so that the rods 1 and 2 move in the same direction. If the engine cylinders associated with the injection pump elements 4 and 6 are required to be disconnected during idling, hydraulic pressure is built up in the cylinder chamber 30 by way of an oil inlet 28 and an oil outlet 29, and the control rod 2 is urged against the zero stop 17 by overcoming the force of the spring 26. In this case, the electromagnet 16 illustrated in Figure 2 is superfluous.
In like manner, the embodiment with control rods 1 and 2 moving in opposite directions shown in Figure 1 can also be fitted with a hydraulic piston arrangement 24, 25. Both in this case and in the case of Figure 3, a pneumatic pressure medium can be used instead of a hydraulic pressure medium.

Claims (5)

1. A control device for multi-cylinder fuelinjection internal combustion engines, in which an injection pump element is associated with each engine cylinder, the throughput of each pump element being controllable by rotation of a pump piston having an inclined control edge, the injection pump elements being divided into a first and a second group, and there being associated with each group an individual control rod which acts on all injection pump elements of the respective group, the control rod of the first group being connected to a final control element of a controller, and the control rod of the second group being arranged so that it can be selectively coupled to or uncoupled from the control rod of the first group, wherein the uncoupled control rod of the second group can be brought into a predetermined position, in particular to zero delivery, and wherein the control rods are disposed parallel to each other on opposite sides of the injection pump elements.
2. A control device as claimed in claim 1,wherein the two control rods can be coupled together so that they move in the same direction, and the control edges of the pump pistons of the injection pump elements of the second group have an inclination which is opposite to the inclination of the control edges of the injection pump elements of the first group.
3. A control device as claimed in claim 1, wherein the two control rods can be coupled together so that they move in opposite directions, and the control edges of the pump pistons of the injection pump elements of the second group and the control edges of the injection pump elements of the first group are inclined in the same direction.
4. A control device as claimed in claim 3, wherein the two control rods can be coupled together by means of a double-armed lever having equal arm lengths and pivotable about a stationary pivot.
5. Acontrol devicefor multi-cylinderfuelinjection internal combustion engines, substantially as hereinbefore described with reference to and as shown in Figure 1 or Figure 2 or Figure 3 of the accompanying drawings.
GB8115791A 1980-05-22 1981-05-22 Control device for multi-cylinder fuelinjection internal combustion engines Expired GB2076905B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT275780A AT371574B (en) 1980-05-22 1980-05-22 CONTROL DEVICE FOR MULTI-CYLINDER INJECTION INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
GB2076905A true GB2076905A (en) 1981-12-09
GB2076905B GB2076905B (en) 1984-05-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8115791A Expired GB2076905B (en) 1980-05-22 1981-05-22 Control device for multi-cylinder fuelinjection internal combustion engines

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AT (1) AT371574B (en)
DE (1) DE3119011C2 (en)
GB (1) GB2076905B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3222241A1 (en) * 1982-06-12 1983-12-15 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Injection engine with cylinder cut-out
DE3334720C2 (en) * 1983-09-26 1994-11-17 Wabco Vermoegensverwaltung Device for controlling several drive units of a drive machine that can be switched on and off
AT408128B (en) * 1985-04-05 2001-09-25 Bosch Robert CONTROL DEVICE FOR MULTI-CYLINDER INJECTION INTERNAL COMBUSTION ENGINES
IT1235589B (en) * 1989-09-07 1992-09-11 Vm Motori Spa ANTI-BLOCK DEVICE FOR INJECTION SYSTEMS, IN PARTICULAR FOR IGNITION ENGINES FOR COMPRESSION

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2144329A1 (en) * 1970-12-22 1972-07-13 Motorpal-Jihlava, N.P., Iglau (Tschechoslowakei) Two-row injection pump for multi-cylinder internal combustion engines
US3815563A (en) * 1971-11-24 1974-06-11 E Stinsa Fuel injection system for multiple cylinder internal combustion engine
DE2821161C2 (en) * 1978-05-13 1983-08-04 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen Split control rack for a fuel injection pump

Also Published As

Publication number Publication date
GB2076905B (en) 1984-05-10
ATA275780A (en) 1982-11-15
DE3119011A1 (en) 1982-03-18
DE3119011C2 (en) 1983-12-01
AT371574B (en) 1983-07-11

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

Effective date: 19930522