EP2467591A1 - Kraftstofffördereinrichtung für eine kraftstoffeinspritzeinrichtung einer brennkraftmaschine - Google Patents
Kraftstofffördereinrichtung für eine kraftstoffeinspritzeinrichtung einer brennkraftmaschineInfo
- Publication number
- EP2467591A1 EP2467591A1 EP10740608A EP10740608A EP2467591A1 EP 2467591 A1 EP2467591 A1 EP 2467591A1 EP 10740608 A EP10740608 A EP 10740608A EP 10740608 A EP10740608 A EP 10740608A EP 2467591 A1 EP2467591 A1 EP 2467591A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pump
- fuel
- delivery device
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 94
- 238000002347 injection Methods 0.000 title claims description 18
- 239000007924 injection Substances 0.000 title claims description 18
- 238000002485 combustion reaction Methods 0.000 title claims description 17
- 239000002828 fuel tank Substances 0.000 claims 1
- 230000001737 promoting effect Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 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
- 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
- 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
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
- F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
-
- 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
-
- 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
- F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
-
- 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
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/365—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages valves being actuated by the fluid pressure produced in an auxiliary pump, e.g. pumps with differential pistons; Regulated pressure of supply pump actuating a metering valve, e.g. a sleeve surrounding the pump piston
-
- 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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/464—Inlet valves of the check valve 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
- 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
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/31—Control of 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
- F02M2200/28—Details of throttles in fuel-injection apparatus
-
- 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
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0023—Valves in the fuel supply and return system
- F02M37/0035—Thermo sensitive valves
-
- 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
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- 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
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0056—Throttling valves, e.g. having variable opening positions throttling the flow
Definitions
- the invention relates to a fuel delivery device for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
- Such a fuel delivery device is known from EP 1 195 514 A2.
- This fuel delivery device has an electrically driven delivery pump through which fuel is conveyed to the suction side of a high-pressure pump.
- the high-pressure pump delivers fuel into a high-pressure region, from which at least indirectly at least one injector of the fuel injection device is supplied with fuel.
- An electrical control device is provided which receives a signal for the pressure prevailing in the high-pressure region via a sensor device. By the electric control device, the electric drive of the feed pump is variably controlled, so that the delivery rate of the feed pump is variable.
- a bypass connection leads to a low-pressure region, which here is a drive region of the high-pressure pump.
- a throttle point is arranged between the feed pump and the suction side of the high-pressure pump.
- a sensor device is arranged, through which the electrical control device, a signal for the pressure prevailing there is supplied.
- the electric control device By the electric control device, the electric drive of the feed pump is controlled such that adjusts a predetermined pressure in the connection between the feed pump and the suction side of the high-pressure pump. Depending on the pressure prevailing on the suction side of the high-pressure pump
- Pressure is variable by the amount of fuel delivered by the high-pressure pump.
- a non-linear delivery characteristic of the high-pressure pump is produced. gig from the pressure prevailing on the suction side. This makes it difficult to control the amount of fuel delivered by the high-pressure pump.
- the known fuel injection device also connected to the electrical control device sensor means is provided, through which the pressure in the high pressure region is detected.
- an electrically operated pressure control valve is arranged, which is controlled by the electric control device such that adjusts a predetermined pressure in the high pressure region.
- the fuel injection device is therefore complicated and the control of the pressure prevailing in the high-pressure area is expensive, since this is the pump and the pressure control valve two separate actuator available.
- the fuel delivery device according to the invention with the features of claim 1 has the advantage that it is simple in construction and also allows a simple structure of the fuel injection device.
- the feed pump is thereby directly for setting a predetermined pressure in
- Another advantage results from the parallel connection of two flow restriction units in the bypass connection, since the combination of a wider variation of the flow rate is possible depending on the pressure in the bypass connection.
- This advantage can be enhanced by an additional actuator, which the flow limiting device depending on the pressure or by the temperature in the inlet of the flow restrictor or in the inlet of the high-pressure pump off or switched on.
- the cross section of the throttle can be changed by an actuator depending on the pressure or the temperature in the inlet of the flow restrictor, since the throttle is not bound to a fixed flow characteristic, but that the flow characteristic of the throttle by varying the cross section depending on the operating situation the fuel delivery device can be adjusted.
- Another advantage is the use of a wax element, since the implementation of the temperature-dependent control of the cross section is realized with a simple component.
- the use of a vortex throttle is advantageous, since a pressure-dependent regulation of the flow rate can be implemented without an additional actuator.
- FIG. 1 shows a fuel injection device of an internal combustion engine in a schematic representation
- 3 shows a characteristic curve of a bypass connection of the fuel injection device
- FIG. 4 shows a characteristic curve of a high-pressure pump of the fuel injection device
- FIG. 5 is a schematic representation of a further exemplary embodiment of a fuel injection device of an internal combustion engine
- FIG. 6 a) is a schematic representation of a vortex throttle
- Figure 7 shows a further embodiment of a fuel injection device of an internal combustion engine in a schematic representation.
- FIG. 1 shows a fuel injection device of an internal combustion engine which has a fuel delivery device.
- the fuel delivery device has a feed pump 10, which draws fuel from a reservoir 12.
- the feed pump 10 has an electric drive 14 which can be operated with variable power and thus variable speed, so that the flow rate and the generated discharge pressure is variable.
- fuel is conveyed to the suction side of at least one high pressure pump 16, which is also part of the fuel delivery device.
- the at least one high-pressure pump 16 fuel is conveyed into a high-pressure region 18 of the fuel injection device, which comprises, for example, a high-pressure accumulator.
- One or more injectors 20 are supplied with fuel from the high-pressure region 18, wherein an injector 20 is assigned to each cylinder of the internal combustion engine.
- the feed pump 10 may be formed, for example, as a flow pump, gear pump, internal gear pump, vane pump or roller-cell pump.
- the feed pump 10 can be arranged on the high-pressure pump 16, can be integrated in it or can be arranged remotely from the high-pressure pump 16.
- the high-pressure pump 16 has at least one pump element 22, which in turn has a tightly guided in a cylinder bore 24 pump piston 26 which is driven in a reciprocating motion.
- the high pressure pump 16 may have its own drive shaft 17 through which the lifting movement of the pump piston 26 is effected via a cam or eccentric.
- the drive shaft 17 of the high pressure pump 16 is mechanically driven, for example via a transmission or a belt drive from the internal combustion engine, so that the speed of the high-pressure pump 16 is proportional to the speed of the internal combustion engine.
- the high-pressure pump 16 does not have its own drive shaft and the lifting movement of the pump piston 26 is effected by an eccentric or cam of a shaft of the internal combustion engine, for example the camshaft or crankshaft of the internal combustion engine.
- each pump element 22 By the pump piston 26 of each pump element 22, a pump working chamber 28 is limited in the cylinder bore 24, which is filled with fuel during the suction stroke of the pump piston 26 and 26 from the fuel pump in the high pressure region 18 is displaced during the delivery stroke of the pump piston.
- Each pump element 22 has an inlet valve 30 in the form of a spring-loaded check valve, which opens during the suction stroke of the pump piston 26, so that fuel delivered by the feed pump 10 reaches the pump work chamber 28.
- Each pump element 22 also has an outlet valve 32 in the form of a spring-loaded check valve, the
- Delivery stroke of the pump piston 26 opens, so that fuel can be displaced into the high-pressure region 18.
- the feed pump 10 can be arranged remotely from the at least one high-pressure pump 16, for example also in the storage container 12.
- the feed pump 10 can be arranged remotely from the at least one high-pressure pump 16, for example also in the storage container 12.
- a fuel filter 38 may be arranged to prevent dirt particles from entering the high-pressure pump 16 and the high-pressure region 18.
- a bypass connection 40 From the line 36 branches downstream of the fuel filter 38 from a bypass connection 40 from which a low pressure area leads.
- a flow-limiting device in the form of a throttle point 42 is provided, by means of which the quantity of fuel flowing off via the bypass connection 40 of the quantity of fuel delivered by the delivery pump 10 is limited.
- a still flow-limiting device 42 in addition to the flow-limiting device 42, a still
- Relief valve may be arranged, which opens the bypass connection 40 only when a predetermined pressure is exceeded.
- the low-pressure region into which the bypass connection 40 opens can, for example, be a drive region of the high-pressure pump 16 with its drive shaft 17. This is particularly advantageous when the high-pressure pump 16 has its own drive shaft 17 and lubrication and / or cooling of the drive region takes place by means of fuel.
- the throttle point 42 may be arranged in the bypass connection 40, for example, in the region of entry into the drive region of the high-pressure pump 16.
- the low-pressure region, into which the bypass connection 40 opens may also be a return to the reservoir 12.
- the at least one high-pressure pump 16 does not have its own drive shaft and lubrication of the drive region of the high-pressure pump 16 is effected by lubricating oil of the internal combustion engine.
- a sensor device 44 is provided, by which the pressure prevailing in the high-pressure region 18 is detected.
- the sensor device 44 is connected to an electrical control device 46, which is thus supplied with a signal for the pressure prevailing in the high-pressure region 18.
- the electric control device 46 of the electric drive 14 of the feed pump 10 is driven with variable power and thus variable speed, such that adjusts a predetermined pressure in the high pressure region 18.
- the pressure required in the high-pressure region 18 can vary depending on operating parameters of the internal combustion engine.
- the electric control device 46 also controls the fuel injection through the injectors 20, for example with regard to the injection time and the injection quantity.
- FIG. 2 shows a characteristic curve for the delivery characteristic of the feed pump 10.
- the delivery flow that is to say delivery rate per unit time
- the characteristic has an at least approximately linear course, that is, the flow rate and thus the delivery rate of the feed pump 10 increases linearly with the delivery pressure. This means that with increasing control performance and thus rotational speed of the electric drive 14 of the feed pump 10, the conveying flow or fuel quantity conveyed by it and the delivery pressure generated by this on the suction side of the high-pressure pump 16 increases at least approximately linearly.
- the feed pump 10 is therefore driven with a certain minimum power and operated at a minimum speed, with a minimum flow rate or a minimum flow rate QO and a minimum delivery pressure p ⁇ set.
- the minimum delivery pressure p ⁇ may be, for example, about 2 bar absolute or greater.
- Minimum delivery pressure p ⁇ and minimum delivery rate or minimum delivery rate are preferably chosen as low as possible in order to keep the load on the delivery pump 10 and the energy requirement low.
- FIG. 3 shows a characteristic curve for the flow characteristic of the bypass connection 40 with the throttle restriction 42.
- the flow rate that is flow rate per unit time
- the characteristic curve has a degressive profile, that is to say that the increase in the flow rate or the flow rate through the bypass connection 40 decreases as the delivery pressure of the delivery pump 10 increases. This means that with increasing from the feed pump on the suction side of the high-pressure pump 16 generated delivery pressure of the flow or the flow rate through the bypass connection increases less.
- the opening pressure of the intake valve or valves 30 of the high-pressure pump 16 is so high that they are at least substantially closed at the minimum delivery pressure p ⁇ on the suction side of the high-pressure pump 16.
- the high pressure pump 16 promotes at least substantially no fuel in the high pressure region 18 at the minimum delivery pressure p ⁇ generated by the feed pump 10 on the suction side thereof.
- the entire minimum delivery flow QO of the feed pump 10 thus flows through the bypass connection 40 with the throttle body 42 in the low pressure region.
- the throttle point 42 in the bypass connection 40 is dimensioned such that the entire minimum delivery flow QO of the feed pump 10 can flow through it without the pressure on the suction side of at least one high-pressure pump 16 rising above the minimum feed pressure p ⁇ and the intake valve or valves 30 of the high-pressure pump 16 would open.
- Another design criterion of the throttle point 42 may be to ensure a sufficient amount of lubricant and / or cooling for the drive range of the at least one high-pressure pump 16. Only when the delivery pressure on the suction side of the at least one high-pressure pump 16 rises above the minimum delivery pressure p ⁇ and the opening pressure of the intake valve or valves 30 do they open and fuel is delivered through the high-pressure pump 16 into the high-pressure region 18.
- the opening pressure of the intake valve or valves 30 For example, the at least one high pressure pump 16 may be about 2 bar absolute or greater.
- FIG. 4 shows a characteristic curve for the delivery characteristic of the at least one high-pressure pump 16.
- the flow rate that is flow rate per unit time
- the high pressure pump 16 above the delivery pressure of the feed pump 10 that is, the pressure prevailing on the suction side of the high-pressure pump 16 pressure applied.
- fuel is delivered by the high-pressure pump 16 only when the pressure on the suction side thereof is higher than the minimum delivery pressure p ⁇ , which may be, for example, about 2 bar absolute.
- the characteristic curve has a continuous monotonous course starting from the minimum delivery pressure p ⁇ , preferably an at least approximately linear one
- the one or more intake valves 30 of the at least one high-pressure pump has a design which ensures, via increasing pressure on the suction side of the high-pressure pump 16 above the opening pressure, a steadily increasing filling of the pump working space 28 of the pump element or elements 22 of the high-pressure pump 16.
- the increase of the flow cross-section released by the inlet valves 30 as a function of the pressure on the suction side of the high-pressure pump 16 is to be selected such that the maximum Ie flow rate requirement of the high-pressure pump 16 is reached at the usual maximum delivery pressures of conventional feed pumps, which may be, for example, to about 5 bar absolute.
- the resulting flow rate variation of the high-pressure pump 16 is continuously and monotonically and thus suitable as a manipulated variable for regulating the pressure prevailing in the high-pressure region 18 via the electrical control variation of the electric drive 14 of the feed pump 10 by means of the electrical control device 46.
- the line 36 via which the feed pump 10 is connected to the suction side of the at least one high-pressure pump 16, preferably has a high hydraulic rigidity. This ensures that the regulation of the pressure in the high-pressure region 18 by means of variable activation of the drive 14 of the feed pump 10 is not influenced by elasticities of the line 36. Under certain circumstances, it may be advantageous to carry out the section 36a of the line 36 between the feed pump 10 and the fuel filter 38 with great hydraulic rigidity and the section 36b of the line 36 between the fuel filter
- the design and tuning of the intake valves 30 of the high-pressure pump 16, the bypass connection 40 with the throttle point 42 and the feed pump 10 takes place according to the following criteria.
- the opening pressure of the intake valves 30 requires a minimum pressure level on the suction side of the high-pressure pump 16 to ensure the following.
- a defined minimum pressure p ⁇ on the suction side which also corresponds to the minimum delivery pressure of the feed pump 10
- the flow rate of the high-pressure pump 16 must be reduced to a required minimum, preferably also completely off, for a so-called zero promotion.
- the minimum pressure p ⁇ on the suction side of the high-pressure pump 16 is to be selected so high over the height of the opening pressure of the inlet valves 30 of the high-pressure pump 16 that the fuel conveyor is on the one hand sufficiently robust, for example against tolerances of line pressure drops and ambient pressure fluctuations, and on the other hand no unnecessarily high pumping capacity requirements the feed pump 10 result.
- the opening pressure of the intake valves may be selected to be in the range of about 2 bar absolute, so that a delivery pressure range of the delivery pump 10 results relatively greater than about 1 bar.
- the inlet valves 30 of the high pressure pump 16 are designed so that they ensure a steadily increasing filling of the high pressure pump 16 with increasing pressure on the suction side of the high pressure pump 16 above the opening pressure.
- the increase in the released flow cross section of the inlet valves 30 above the pressure difference, between the pressure on the suction side of the high-pressure pump 16 and the pressure in the pump working space 28, is designed so that the maximum flow rate requirement of
- High-pressure pump 16 at conventional delivery pressures of conventional low-cost feed pumps 10 with electric drive 14 is achieved.
- the maximum delivery pressure can be about 4 bar relative or 5 bar absolute.
- a large flow rate variation of the high pressure pump 16 is achieved via a limited variation of the pressure generated by the feed pump 10 on the suction side of the high pressure pump 16.
- the variation of the amount of fuel flowing through the bypass connection 40 is determined by the throttle point 42 and is limited.
- the design of the throttle body 42 in the bypass connection 40 is such that the amount of fuel flowing through the bypass connection 40 on the one hand as small as possible, on the other hand, however, is large enough to ensure adequate lubrication and / or cooling of the drive range of the high-pressure pump 16 and the possibly required Minimum delivery rate of the delivery pump 10 is not fallen short of.
- the feed pump 10 and its electric drive 14 are designed such that a stable operation over the entire working range, that is from minimum flow rate or flow and delivery pressure to the maximum randomlymen- ge or flow rate and delivery pressure is guaranteed.
- the minimum delivery rate at minimum delivery pressure is determined by the opening pressure of the intake valves 30 of the high pressure pump 16 and the resulting amount of fuel flowing out of the bypass connection 40.
- the maximum delivery rate or delivery rate at maximum delivery pressure is determined by the required filling pressure of the high-pressure pump
- FIG. 5 an alternative embodiment of the invention is shown in which the cross section of the throttle 42 can be varied by a mechanical or electrical actuator 44.
- This actuator 44 may control the cross section of the throttle 42 depending on the pressure or the temperature in the bypass connection 40 or in the inlet of the throttle 42. This allows for a variation of
- Flow rate of the fuel through the bypass connection 40 depending on the pressure or the temperature of the fuel. If an electrically controlled actuator 44 is provided, then this can be controlled by software in the electrical control device 46.
- the feed pump 10 Since at low fuel temperatures often a large minimum flow rate, flow rate per unit time, the feed pump 10 must be adjusted, it is advantageous if the maximum cross section of the throttle 42 is open at low fuel temperatures. In order to prevent this high fuel return from occurring even at high fuel delivery rates or at full delivery of the high pressure pump 16, the cross section of the throttle 42 can be continuously reduced with increasing temperatures.
- the actuator 44 may also have the cross-section of the throttle depending on the pressure in the inlet to the high-pressure pump 16 or depending on the pressure in the Bypassverbin- 40 or in the inlet to the throttle 42 vary. Again, at a low pressure, the maximum cross section of the throttle 42 should be open and be reduced with increasing pressures. Due to the reduced cross-section of the throttle 42 is at full promotion of
- High-pressure pump 16 a high return amount of fuel through the bypass passage 40 avoided, so that the fuel delivery device can be designed more energy efficient and cheaper. But there can be other types of control of the cross section of the throttle
- a cross-sectional reduction in stages or an increase in the cross-section with increasing pressure or with increasing temperature may be provided, e.g. a cross-sectional reduction in stages or an increase in the cross-section with increasing pressure or with increasing temperature.
- a possible actuator 44 for temperature-dependent control of the throttle offers a wax element or bimetallic element.
- FIG. 6a shows a vortex throttle by the use of which a reduction of the flow rate through the bypass connection 40 can be realized with increasing pressure.
- a vortex throttle With a vortex throttle, the flow increases less with increasing pressure than with a standard throttle.
- Figure 6b shows a diagram in which the flow above the applied pressure for a standard throttle (A) and a vortex throttle (B) are shown.
- A standard throttle
- B vortex throttle
- the possibility of arranging at least two flow-limiting devices 42 in the bypass connection 40 as shown in FIG. 6 is parallel.
- at least one throttle 42 can be varied by an additional mechanical or electrical actuator 44 with respect to its cross section depending on the pressure or the temperature. There are all previously mentioned variants for varying the throttle cross-section possible.
- Another mechanical or electrical actuator 52 which is located in front of or behind at least one throttle 42, can be used to the Flow through the hydraulic line in which the throttle 42 is to interrupt. If it is an electrical actuator 52, it is controlled by the electrical control device 46.
- the actuator 52 may open or close the hydraulic line depending on a measured in the inlet of the bypass connection 40 temperature or measured in the inlet of the bypass connection 40 pressure. It is advantageous to open the hydraulic line at low pressures or low temperatures and close otherwise, as this high flow at low temperatures and low pressures is possible. At high temperatures and high pressures, which correspond to a high flow rate of the high pressure pump 16, however, only a small amount of fuel flows through the bypass connection 40th
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009028585 | 2009-08-17 | ||
| DE102010031628A DE102010031628A1 (de) | 2009-08-17 | 2010-07-21 | Kraftstofffördereinrichtung für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine |
| PCT/EP2010/061211 WO2011020693A1 (de) | 2009-08-17 | 2010-08-02 | Kraftstofffördereinrichtung für eine kraftstoffeinspritzeinrichtung einer brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2467591A1 true EP2467591A1 (de) | 2012-06-27 |
| EP2467591B1 EP2467591B1 (de) | 2013-10-30 |
Family
ID=43495585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10740608.4A Not-in-force EP2467591B1 (de) | 2009-08-17 | 2010-08-02 | Kraftstofffördereinrichtung für eine kraftstoffeinspritzeinrichtung einer brennkraftmaschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2467591B1 (de) |
| CN (1) | CN102472209B (de) |
| DE (1) | DE102010031628A1 (de) |
| WO (1) | WO2011020693A1 (de) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011076063A1 (de) * | 2011-05-18 | 2012-11-22 | Robert Bosch Gmbh | System zum Fördern eines Fluides |
| DE102012203867A1 (de) * | 2012-03-13 | 2013-09-19 | Robert Bosch Gmbh | Kraftstofffördereinrichtung und Verfahren zum Betätigen einer Kraftstofffördereinrichtung |
| GB2501289A (en) * | 2012-04-18 | 2013-10-23 | Eaton Aerospace Ltd | Aircraft fuel supply system |
| DE102013210816A1 (de) | 2013-06-10 | 2014-12-11 | Robert Bosch Gmbh | Kraftstofffördereinrichtung für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine |
| DE102013210811A1 (de) | 2013-06-10 | 2014-12-11 | Robert Bosch Gmbh | Kraftstofffördereinrichtung für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine |
| DE102013216468A1 (de) | 2013-08-20 | 2015-02-26 | Volkswagen Aktiengesellschaft | Kraftstoffförderereinrichtung und Verfahren zum Betreiben einer Kraftstofffördereinrichtung |
| DE102013216817A1 (de) * | 2013-08-23 | 2015-02-26 | Continental Automotive Gmbh | Pumpenanordnung und System für ein Kraftfahrzeug |
| AT519880B1 (de) * | 2017-07-05 | 2018-11-15 | Avl List Gmbh | Druckregeleinrichtung für ein Kraftstoffverbrauchsmesssystem und Kraftstoffverbrauchsmesssystem |
| CN108266294A (zh) * | 2017-12-27 | 2018-07-10 | 潍柴动力股份有限公司 | 发动机燃油系统及发动机 |
| DE102018216175A1 (de) * | 2018-09-21 | 2020-03-26 | Robert Bosch Gmbh | Kraftstofffördereinrichtung für eine Brennkraftmaschine |
| DE102018216176A1 (de) * | 2018-09-21 | 2020-03-26 | Robert Bosch Gmbh | Kraftstofffördereinrichtung für eine Brennkraftmaschine |
| DE102023206440A1 (de) * | 2023-07-06 | 2025-01-09 | Robert Bosch Gesellschaft mit beschränkter Haftung | Nullförderdrossel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579139A (en) * | 1982-04-16 | 1986-04-01 | Bowles Fluidics Corporation | Siphon starter |
| DE19818421B4 (de) * | 1998-04-24 | 2017-04-06 | Robert Bosch Gmbh | Kraftstoffversorgungsanlage einer Brennkraftmaschine |
| DE19935649A1 (de) * | 1999-06-08 | 2000-12-21 | Alfmeier Praez Ag | Vorwärmvorrichtung für Dieselkraftfahrzeuge |
| IT1320684B1 (it) | 2000-10-03 | 2003-12-10 | Fiat Ricerche | Dispositivo di controllo della portata di una pompa ad alta pressionein un impianto di iniezione a collettore comune del combustibile di un |
| DE10148222A1 (de) * | 2001-09-28 | 2003-04-17 | Bosch Gmbh Robert | Verfahren zum Betrieb einer Brennkraftmaschine |
| DE102007057452A1 (de) * | 2007-11-29 | 2009-06-04 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Kraftstoffsystems einer Brennkraftmaschine |
-
2010
- 2010-07-21 DE DE102010031628A patent/DE102010031628A1/de not_active Withdrawn
- 2010-08-02 WO PCT/EP2010/061211 patent/WO2011020693A1/de not_active Ceased
- 2010-08-02 CN CN201080036318.5A patent/CN102472209B/zh not_active Expired - Fee Related
- 2010-08-02 EP EP10740608.4A patent/EP2467591B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011020693A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102010031628A1 (de) | 2011-02-24 |
| WO2011020693A1 (de) | 2011-02-24 |
| EP2467591B1 (de) | 2013-10-30 |
| CN102472209B (zh) | 2014-06-25 |
| CN102472209A (zh) | 2012-05-23 |
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