EP2825764A1 - Kraftstofffördereinrichtung und verfahren zum betätigen einer kraftstofffördereinrichtung - Google Patents
Kraftstofffördereinrichtung und verfahren zum betätigen einer kraftstofffördereinrichtungInfo
- Publication number
- EP2825764A1 EP2825764A1 EP13701617.6A EP13701617A EP2825764A1 EP 2825764 A1 EP2825764 A1 EP 2825764A1 EP 13701617 A EP13701617 A EP 13701617A EP 2825764 A1 EP2825764 A1 EP 2825764A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- temperature
- hydraulic line
- pressure
- pump
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
- F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
-
- 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
- F02D2200/0606—Fuel 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
- F02D41/3082—Control of electrical fuel pumps
-
- 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
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/24—Fuel-injection apparatus with sensors
- F02M2200/248—Temperature sensors
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
- F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/08—Feeding by means of driven pumps electrically driven
Definitions
- the invention relates to a fuel delivery device for a fuel injection of an internal combustion engine and a method for actuating such a fuel delivery device according to the preamble of the independent claims.
- the document DE 199 16 100 A1 discloses a method and a device for controlling an internal combustion engine, in particular an internal combustion engine with a common rail system.
- at least one pump delivers fuel to a reservoir.
- the pressure in the memory is detected, it being distinguished on the basis of at least one speed signal and / or a load signal between at least a first and a second operating state.
- at least one first pressure control means is used to set the pressure in the first operating state
- at least one second pressure control means is used in the second operating state.
- the pump In operating conditions with low fuel supply temperatures ( ⁇ 5 - 15 ° C), however, the pump is operated unthrottled and the pressure control with a High pressure control valve implemented. This means that the pump absorbs the maximum possible energy and promotes a maximum volume flow at high pressure. This excess quantity is deactivated by the pressure regulating valve (DRV). By controlling the DRV, the potential energy, namely the pressure of the loss volume flow, is converted into thermal energy. The heated fuel quantity is then introduced in modern low-pressure fuel systems directly into the flow of the fuel filter.
- DRV pressure regulating valve
- the fuel in the filter is heated, which is necessary for diesel fuel, since it has poor flow properties at low temperatures and can clog the filter by precipitation of a solid phase. This will cause the engine or vehicle to stop.
- the fuel in the inlet of the high-pressure pump very quickly exceeds the highest possible temperature for this operating state (DRV control), and returns to the suction throttle mode (ZME).
- DVR control the lowest possible temperature for this operating state
- ZME suction throttle mode
- the inlet temperature of the filter and the high-pressure pump drops rapidly again, since only cold fuel from the tank of the vehicle is promoted. If the lower temperature limit for the suction throttle mode is undershot, the system switches back to DRV mode. This means that in cold temperatures often between the two control modes is changed.
- the fuel delivery device according to the invention and the method for operating such a fuel delivery device with the characterizing features of the independent claims have the advantage that there is no need to switch back and forth between two control modes.
- the delivery rate of the feed pump can be increased or reduced, so that always the desired temperature between the feed pump and high pressure pump is reached. This can avoid that the filter between pump and high-pressure pump clogged at too cold fuel temperatures. It will be too high Avoid temperatures that may stress the components and lines too much.
- Another advantage is given by the ability to regulate the pressure in the high pressure range by means of volume control, as a function of the operating situation of the internal combustion engine, the pressure in the high pressure range can be adjusted very accurately. Furthermore, the fuel in the hydraulic line is supplied with heating fuel via the return line, which prevents clogging of the filter in the hydraulic line.
- a throttle device on the suction side of the high-pressure pump through which the flow rate of the high-pressure pump is controlled, since this element for the inventive device and the method according to the invention allows the fuel to flow unhindered to the high-pressure pump.
- the throttle device allows the demand-based adjustment of the amount of fuel flowing to the high-pressure pump.
- the temperature of the fuel in the hydraulic line is between the lower temperature T u and the upper temperature T 0 . This avoids turbulence of the filter due to excessively low temperatures and excessive stress on the components of the fuel delivery device when the fuel temperatures are too high.
- FIG. 1 shows a fuel delivery device in a schematic representation according to a first embodiment of the invention
- FIG. 2 shows a flowchart for a method for operating a fuel delivery device.
- FIG. 1 shows a fuel delivery device in a schematic representation.
- the fuel delivery device has a feed pump 10, which draws fuel from a reservoir 12.
- fuel is conveyed through a hydraulic line 32 to a suction side of at least one high-pressure pump 16, which is also part of the fuel delivery device.
- the feed pump 10 has an electric drive, which varies with deraji power and thus variable speed or constant power and speed can be operated.
- a high-pressure region 18 which, for example, comprises a high-pressure accumulator 18.
- One or more injectors 19 are supplied with fuel from the high-pressure region 18, wherein an injector 19 is assigned to each cylinder of the internal combustion engine.
- the high-pressure pump 16 has at least one pump element, which in turn has a pump piston which is driven in a stroke movement and limits a pump working space.
- the drive range of the high-pressure pump 16 is mechanically driven, for example via a transmission or a belt drive of the internal combustion engine, so that the speed of the high-pressure pump 16 is proportional to the speed of the internal combustion engine.
- a fuel filter 33 is arranged in the hydraulic line 32 in order to prevent dirt particles from entering the high-pressure pump 16 and the high-pressure region 18.
- a throttle device 14 may be arranged in order to adapt the amount of fuel delivered by the feed pump 10 to the demand for the pressure in the high-pressure region 18.
- a branch line 30 can branch off from the hydraulic connection 32.
- a pressure relief valve 28 is arranged, which opens when exceeding a predetermined opening pressure and abgrest fuel from the hydraulic line 32 into the reservoir 12.
- the branch line 30 is arranged upstream of the throttle device 14 in the flow direction.
- the pressure in the high-pressure region 18 can be regulated in addition to regulation by the throttle device 14 via a device for volume control 24 become.
- the device for flow control 24 may be configured as a pressure control valve 24. This pressure control valve 24 controls excess fuel from the high-pressure region 18 into a return line 26.
- the return line 26 opens via a mixing point 25 in a portion of the hydraulic line 32 between the feed pump 10 and filter 33rd
- a temperature sensor 20 is arranged in the hydraulic line 32.
- the temperature sensor 20 is located in a preferred embodiment in a portion of the hydraulic line 32 between the filter 33 and the high pressure pump 16.
- the temperature sensor 20 may also be disposed in a portion of the hydraulic line 32 between the mixing point 25 and the filter 33.
- the temperature sensor 20 is connected to a control device 22 in connection.
- the control device 22 is connected to the electric drive of the feed pump 10 and can vary the delivery rate of the feed pump 10 by controlling the electric drive of the feed pump 10 with different power.
- the control device 22 can control the throttling device 14 such that the throttle device 14 completely opens and the entire amount of fuel conveyed by the feed pump 10 reaches the high-pressure pump 16, or that the cross-section of the throttle device 14 is reduced, so that only a part of the Feed pump 10 conveyed amount of fuel to the high-pressure pump 16 passes, or that the throttle device 14 is closed and no fuel to the high-pressure pump 16 passes.
- control device 22 can control the quantity-regulating device 24 in such a way that a desired pressure is established in the high-pressure region 18.
- An inventive method for operating the fuel delivery device is the controlled heating of the fuel and is used when falling below a predetermined temperature T M in the reservoir 12.
- T M a predetermined temperature
- the temperature of the fuel in front of the filter 33 is specifically influenced in order to avoid clogging of the filter.
- the temperature of the fuel in the reservoir 12 is heated so that it can be quickly switched to a normal control mode for the fuel delivery device.
- FIG. 2 shows a flowchart which represents the inventive method for operating a fuel delivery device.
- the method checks whether the temperature in the storage container 12 is below the minimum temperature T M. This can be done by a temperature sensor in the reservoir 12, which is connected to the control device 22. Alternatively, by the temperature sensor 20 in the hydraulic line 32, the temperature of the fuel from the reservoir 12 can be measured approximately. In this case, it can be ensured by closing the device for quantity control 24 at the high-pressure region 18 that only fuel flows from the reservoir 12 through the hydraulic line 32.
- the method goes to method step 200.
- the throttle device 14 is completely opened.
- the regulation of the pressure in the high-pressure region 18 takes place only via the device for volume control 24. Both the opening of the throttle device 14, as well as the control of the device for flow control 24 via the control device 22nd
- Excess fuel from the high-pressure region 18 passes through the volume control device 24 and the return line 26 in the hydraulic line 32.
- the fuel from the high-pressure region 18 has a higher temperature than the fuel from the reservoir 12, since the potential Energy in the high pressure area 18 is converted into thermal energy.
- the heated fuel from the high-pressure region 18 mixes with the cool fuel from the reservoir 12 at the mixing point 25.
- the temperature sensor 20 measures the temperature of the fuel in the hydraulic line 32, which results from the mixing of the warmer fuel from the return of the high-pressure region 18 and the reservoir 12. Exceeds the measured temperature at the temperature sensor 20, an upper temperature T 0 , the flow rate of the feed pump 10 is raised by the temperature sensor 20 via the control device 22 in step 330. In addition, the cross section of the throttle device 14 can be reduced. If the measured temperature falls below a lower temperature T u , the flow rate of the feed pump 10 is reduced in the method step 320 by the temperature sensor 20 via the control device 22.
- method step 400 it is checked whether the minimum temperature T M in the storage container 12 has been reached. This can be carried out analogously to the methods proposed in method step 100. If the temperature in the storage container 12 is below the temperature T M , the process goes to step 300, otherwise the process in step E is terminated.
- the check in method step 400 can take place after predefined time intervals, so that, for example, method step 400, in which the temperature in storage container 12 is checked, is carried out only after the expiry of a predetermined time interval. In this case, according to the procedure Step 330 or the method step 320, the method step 300 performed until the predetermined time interval has expired.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201210203867 DE102012203867A1 (de) | 2012-03-13 | 2012-03-13 | Kraftstofffördereinrichtung und Verfahren zum Betätigen einer Kraftstofffördereinrichtung |
| PCT/EP2013/051357 WO2013135409A1 (de) | 2012-03-13 | 2013-01-24 | Kraftstofffördereinrichtung und verfahren zum betätigen einer kraftstofffördereinrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2825764A1 true EP2825764A1 (de) | 2015-01-21 |
| EP2825764B1 EP2825764B1 (de) | 2016-01-20 |
Family
ID=47624059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13701617.6A Active EP2825764B1 (de) | 2012-03-13 | 2013-01-24 | Kraftstofffördereinrichtung und verfahren zum betätigen einer kraftstofffördereinrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2825764B1 (de) |
| DE (1) | DE102012203867A1 (de) |
| WO (1) | WO2013135409A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10934933B2 (en) * | 2018-08-31 | 2021-03-02 | Paccar Inc | Fuel gelling prevention using engine auto start functionality |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19818421B4 (de) * | 1998-04-24 | 2017-04-06 | Robert Bosch Gmbh | Kraftstoffversorgungsanlage einer Brennkraftmaschine |
| DE19916100A1 (de) | 1999-04-09 | 2000-10-12 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
| DE102010031628A1 (de) * | 2009-08-17 | 2011-02-24 | Robert Bosch Gmbh | Kraftstofffördereinrichtung für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine |
| DE102009029596B4 (de) * | 2009-09-18 | 2018-06-14 | Robert Bosch Gmbh | Verfahren zur Steuerung einer Brennkraftmaschine |
| DE102009043072A1 (de) * | 2009-09-25 | 2011-03-31 | Volkswagen Ag | Verfahren zum Betreiben einer Brennkraftmaschine |
-
2012
- 2012-03-13 DE DE201210203867 patent/DE102012203867A1/de not_active Withdrawn
-
2013
- 2013-01-24 EP EP13701617.6A patent/EP2825764B1/de active Active
- 2013-01-24 WO PCT/EP2013/051357 patent/WO2013135409A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013135409A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012203867A1 (de) | 2013-09-19 |
| EP2825764B1 (de) | 2016-01-20 |
| WO2013135409A1 (de) | 2013-09-19 |
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