GB2238140A - Limp-home control of fuel injection circuit - Google Patents
Limp-home control of fuel injection circuit Download PDFInfo
- Publication number
- GB2238140A GB2238140A GB9021868A GB9021868A GB2238140A GB 2238140 A GB2238140 A GB 2238140A GB 9021868 A GB9021868 A GB 9021868A GB 9021868 A GB9021868 A GB 9021868A GB 2238140 A GB2238140 A GB 2238140A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control device
- fuel
- low
- distributor element
- pressure
- 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
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 46
- 238000002347 injection Methods 0.000 title claims abstract description 13
- 239000007924 injection Substances 0.000 title claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 230000001419 dependent effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
-
- 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
- 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
- F02M59/38—Pumps characterised by adaptations to special uses or conditions
Abstract
A low-pressure fuel circuit for an air-compressing fuel-injected internal combustion engine, comprises a distributor-type injection pump 14 with a rotating and axially displaceable distributor element 13 and with radially movable, fuel delivery pump plungers 16 in the distributor element, an electronic control device 23, which determines the injection quantity required, for controlling two solenoid valves 5, 6, determining the fuel passage for pressure control of the distributor element 13 and is characterised by an electronic auxiliary control device 26 for controlling the upstream solenoid valve 5, in order to make possible limp-home operation in the event of failure of the control device 23. The auxiliary device 26 receives signals only from a load sensor such as a potentiometer attached to the accelerator pedal. <IMAGE>
Description
1 E.' 1 Low-pressure fuel circuit for an air-compressing fuel-injected
internal combustion engine, having a speed-dependent fuel feed pump and a distributor-tyDe iniection iDump The invention relates to a low-pressure fuel circuit for an air- compressing fuel-injected internal combustion engine having a speed- dependent fuel feed pump and a distributor-type injection pump with a rotating distributor element which in a transverse bore has radially movable pump plungers for fuel delivery, and having an electronic principal control device, which determines the injection quantity required, for controlling two electromagnetically actuable valves in a fuel connection line having restrictors, at least one of the valves being provided via a control line for control pressure loading of the.axially displaceable distributor element acting against a spring.
The known low-pressure fuel circuit according to DE 3,219,988 Al has an electronically controlled distributor-type injection pump having a rotating and longitudinally displaceable distributor element which contains, in a transverse bore, radially movable pump plungers for fuel delivery. An electronic control device processing numerous operating parameters of the internal combustion engine actuates electromagnetic valves for controlling the pressure for the axial adjustment of the distributor element. In the case of an impairment of the functioning or of a failure of the control device, the valves are adjusted manually via a handle bar and a cam pair in order in this way to make possible limp- home operation.
The present invention seeks to ensure in a singleparameter manner maintenance of driving operation in the form of limp-home operation, without manual intervention, 2 in the event of failure of the electronic control device.
According to the present invention there is provided a low-pressure fuel circuit for an aircompressing fuel-injected internal combustion engine, having a speed-dependent fuel feed pump and a distributor-type injection pump with a rotating distributor element which in a transverse bore has radially movable pump plungers for fuel delivery, and having an electronic principal control device, which determines the injection quantity required, for controlling two electromagnetically actuable valves in a fuel connection line having restrictors, at least one of the valves being provided via a control line for control pressure loading of the axially displaceable distributor element acting against a spring, wherein the control line leading to the distributor element branches off from the fuel connection line between the two valves and an electronic auxiliary control device acting independently of the principal control device and controllable loaddependently, is provided as limp-home aid, by means of which, in the case of a load position lying above the idling position, the valve arranged in the fuel connection line upstream of the control line which branches off is adjustable in the closing direction.
The electronic control device acting as principal control device processes input internal combustion engine and environmental parameters as well as load variables to form an output signal suitable for controlling the valves. If any fault occurs in the electronics of the principal control device, the secondary control device comes into effect as emergency-running electronics. The auxiliary control device is a single-parameter device, i.e. it does not process any operating parameters but only load signals acquired by the sensor to form an output signal for the first valve as seen in the direction of flow, which acts load-dependently as a variable restrictor. The valve is controlled by the auxiliary 3 control device in such a way that, in the case of a load increase above the idling position, the opening of the valve is closed in controlled fashion and the pressure downstream of this valve is reduced, a set of hydraulic characteristics of the controller for emergency running of the engine is obtained in the speed-dependent equilibrium between the spring force acting on the distributor element and the pressure loading.
The non-prior-published prior art (Patent Application P 39 29 932.5-13) shows and describes an emergency-running device which maintains driving operation but in which the valve pair, which becomes deenergised in the event of failure of the electronics, switches to "open" and the control pressure applied to the distributor elements can be altered loaddependently by a 2/2-way valve or variable restrictor arranged in the bypass of the fuel connection line.
Preferably, the load signals destined for the auxiliary control device correspond to the load signals for the principal control device. The load signals may be formed by a sensor, for example a potentiometer, detecting the particular accelerator pedal position.
Preferably, the principal control device and the auxiliary control device are combined to form one constructional unit.
The invention is described in greater detail below by means of an embodiment illustrated in the drawing, in which: Fig. 1 shows, in schematic representation, the lowpres-sure fuel circuit and an electronic principal and auxiliary control device, and Fig. 2 shows a diagram in which quantity characteristics are plotted against the speed in connection with the respective closing time of the clocked first valve.
The low-pressure fuel circuit 1 of an air-compressing fuel-injected internal combustion engine 4 essentially comprises a fuel feed pump 3 and a filter 4 arranged successively in a fuel feed line 2, two electromagnetically actuable valves 5, 6 in a connection line 9 which branches off from the fuel feed line 2, has restrictors 7, 8, opens into a fuel return line 10 and, between the two valves 5, 6, has a branch-off point 11 from which a control line 12 leads to a rotating and longitudinally displaceable distributor element 13 of a distributor-type injection pump 14 (shown in part). The distributor element 13 is provided with a transverse bore 15 for two opposed and radially movable pump plungers 16, 17 which, in co- operation with an adjustable cam ring 18 and intermediate displacement elements 19, 20 and rollers 21, determine the injection quantity. When pressureloaded, the distributor element 13, which is mounted in axially displaceable fashion, acts against a compression spring 22 in such a way that, in the case of decreasing control pressure, a larger quantity of fuel is brought about by the larger pumping stroke of the pump plungers 16, 17.
The valves 5, 6, which are designed as 2/2-way valves, are controllable by an electronic control device 23 processing internal combustion engine and environmental parameters (indicated by arrows). The control device 23 acting as principal control device furthermore processes a load signal which is produced by a sensor 25 detecting the particular position of the accelerator pedal 24. A potentiometer or an inductive or capacitive displacement sensor can be provided as sensor. The load signal is simultaneously fed to an auxiliary control device 26, which is designed as a singleparameter device and only processes the load signal for controlling the valve 5 arranged upstream of the branchoff point 11. This auxiliary control device 26 comes into effect when a fault is present in the principal control device and makes the maintenance of driving operation impossible. With the auxiliary control device 26 it is 1 possible to control the valve 5 independently of the principal control device 23, in dependence on the accelerator pedal in pulse-widthmodulated fashion in such a way that it acts virtually as a restrictor, variable in dependence on the accelerator pedal, in the connection line 9 upstream of the control line 12. In Fig. 2, in a diagram representing the injection quantity against the speed, the characteristic for the starting quantity is denoted by x and the characteristic for the maximum full-load quantity by y, while the characteristics denoted by a - f represent the increasing closing time of the clocked valve 5. The characteristic a corresponds to the progression with the valve 5 continuously open and the characteristic f indicates the progression during which the clocked valve is about 20% open.
In the case of the internal combustion engine not being under load, an accelerator-pedal-dependent emergency idling speed in accordance with the set of characteristics is established. If the internal combustion engine is subjected to load, this speed drops, the quantity increasing, in accordance with the quantity characteristics a - f shown, up to the fullload quantity. The vehicle can thus be driven in limp-home mode with this auxiliary control device 26 as electronic single-parameter controller when the accelerator pedal 24 is actuated.
Also arranged in the low-pressure fuel circuit, in parallel with the fuel feed pump 3 upstream of the filter 4 is a pressure regulator 27 with a restrictor 28, which regulates a rising pressure characteristic via the speed. In addition, a further pressure regulator 30 for maintaining a minimum pressure is provided upstream of a fuel tank 29 in order to avoid escape of enclosed air. 31, 32 denote non-return valves connected downstream of the valves 5, 6 in the connection line 9.
6
Claims (6)
1. A low-pressure fuel circuit for an air-compressing fuel-injected internal combustion engine, having a speed-dependent fuel feed pump and a distributor-type injection pump with a rotating distributor element which in a transverse bore has radially movable pump plungers for fuel delivery, and having an electronic principal control device, which determines the injection quantity required, for controlling two electromagnetically actuable valves in a fuel connection line having restrictors, at least one of the valves being provided via a control line for control pressure loading of the axially displaceable distributor element acting against a spring, wherein the control line leading to the distributor element branches off from the fuel connection line between the two valves and an electronic auxiliary control device acting independently of the principal control device and controllable load-dependently, is provided as limphome aid, by means of which, in the case of a load position lying above the idling position, the valve arranged in the fuel connection line upstream of the control line which branches off is adjustable in the closing direction.
2. A low-pressure fuel circuit according to Claim 1, wherein the load signals destined for the auxiliary control device correspond to the load signals for the principal control device.
3. A low-pressure fuel circuit according to Claim 1 or 2, wherein the load signals are formed by a sensor detecting the particular accelerator pedal position.
1 i 7
4. A low-pressure fuel circuit according to Claim 1, 2, or 3, wherein the sensor comprises a potentiometer.
5. A low-pressure fuel circuit according to any one of Claims 1 to 4, wherein the principal control device and the auxiliary control device are combined to form one constructional unit.
6. A low-pressure fuel circuit for an air-compressing fuel-injected internal combustion engine, substantially as described herein, with reference to, and as illustrated in, the accompanying drawings.
Published 1991 at The Patent Office. State House. 66/71 High Holborn. London WCIR4TP. Further copies Tnay be obtained from Sales Branch, Unit 6, Nine Mile Point Cwmfelinfach. Cross Keys. Newport, NPI 7HZ. Printed by Multiplex techniques ltd, St Mazy Cray, Kent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3935326A DE3935326C1 (en) | 1989-10-24 | 1989-10-24 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9021868D0 GB9021868D0 (en) | 1990-11-21 |
| GB2238140A true GB2238140A (en) | 1991-05-22 |
| GB2238140B GB2238140B (en) | 1993-08-11 |
Family
ID=6392053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9021868A Expired - Fee Related GB2238140B (en) | 1989-10-24 | 1990-10-09 | Low-pressure fuel circuit for an air-compressing fuel-injected internal combustion engine,having a speed-dependent fuel feed pump |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3935326C1 (en) |
| FR (1) | FR2653495B1 (en) |
| GB (1) | GB2238140B (en) |
| IT (1) | IT1242081B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3834361A (en) * | 1972-08-23 | 1974-09-10 | Bendix Corp | Back-up fuel control system |
| GB2101359A (en) * | 1981-05-28 | 1983-01-12 | Lucas Ind Plc | Fuel injection pumping system |
| US4534328A (en) * | 1981-07-30 | 1985-08-13 | Robert Bosch Gmbh | Emergency control apparatus for a Diesel engine |
| US4611565A (en) * | 1984-05-25 | 1986-09-16 | Honda Giken Kogyo Kabushiki Kaisha | Backup system for electronic fuel injection control system |
| GB2191311A (en) * | 1986-05-27 | 1987-12-09 | Daimler Benz Ag | Fuel injection system for an air-compressing internal combustion engine |
| US4729357A (en) * | 1985-09-20 | 1988-03-08 | Steyr-Daimler-Puch Ag | Control system for controlling an internal combustion engine provided with at least one fuel injection pump |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2069721A (en) * | 1980-02-19 | 1981-08-26 | Lucas Industries Ltd | Control system for fuel supply in an i.c. engine |
| GB2119133B (en) * | 1982-04-17 | 1985-10-23 | Lucas Ind Plc | Fuel pumping apparatus |
| DE3311351A1 (en) * | 1983-03-29 | 1984-10-04 | Robert Bosch Gmbh, 7000 Stuttgart | Control device for the fuel metering in a diesel internal combustion engine |
-
1989
- 1989-10-24 DE DE3935326A patent/DE3935326C1/de not_active Expired - Fee Related
-
1990
- 1990-10-09 GB GB9021868A patent/GB2238140B/en not_active Expired - Fee Related
- 1990-10-16 IT IT48374A patent/IT1242081B/en active IP Right Grant
- 1990-10-23 FR FR9013096A patent/FR2653495B1/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3834361A (en) * | 1972-08-23 | 1974-09-10 | Bendix Corp | Back-up fuel control system |
| GB2101359A (en) * | 1981-05-28 | 1983-01-12 | Lucas Ind Plc | Fuel injection pumping system |
| US4534328A (en) * | 1981-07-30 | 1985-08-13 | Robert Bosch Gmbh | Emergency control apparatus for a Diesel engine |
| US4611565A (en) * | 1984-05-25 | 1986-09-16 | Honda Giken Kogyo Kabushiki Kaisha | Backup system for electronic fuel injection control system |
| US4729357A (en) * | 1985-09-20 | 1988-03-08 | Steyr-Daimler-Puch Ag | Control system for controlling an internal combustion engine provided with at least one fuel injection pump |
| GB2191311A (en) * | 1986-05-27 | 1987-12-09 | Daimler Benz Ag | Fuel injection system for an air-compressing internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3935326C1 (en) | 1991-05-02 |
| IT1242081B (en) | 1994-02-08 |
| IT9048374A0 (en) | 1990-10-16 |
| FR2653495B1 (en) | 1995-01-20 |
| GB9021868D0 (en) | 1990-11-21 |
| GB2238140B (en) | 1993-08-11 |
| FR2653495A1 (en) | 1991-04-26 |
| IT9048374A1 (en) | 1992-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19971009 |