CN102338012A - High-pressure ejection system for fuel internal combustion engine - Google Patents

Abstract

The invention relates to a high-pressure ejection system for a fuel internal combustion engine, the ejection system is provided with a high-pressure storage used for multiple cylinders. The ejection system (200) also comprises a high pressure pump (202), a pressure regulating valve (208); and a control device (214) used for controlling the pressure regulating valve (208) and used for keeping a system pressure in the high pressure storage (204) in routine work. The pressure regulating valve (208) at least partially releases an exhaust part to a low pressure pipeline (210) under the condition of not being controlled. Via a throttling part (218), fuel flow from the high pressure storage (204) to a low pressure pipeline (216) is limited, so as to at least guarantee a lowest pressure in the high pressure storage (204) required for work of the internal combustion engine. The throttling part (218) is operable in a mode of irrelevant to control of the pressure regulating valve (208).

Description

The high-pressure injection system that is used for fuel combustion

Technical field

The present invention relates to a kind of ejecting system that is used for fuel combustion, this internal-combustion engine has a common high pressure accumulator that is used for a plurality of cylinders.

Background technique

This ejecting system is known with " common rail system " notion (CR-Systeme) in automotive field.This system has one and common is used for the high pressure accumulator (" rail ") to a plurality of cylinder fuelings of internal-combustion engine.A high-pressure service pump makes the fuel in the high pressure accumulator reach a high pressure level.A pressure regulator valve can be set in the discharge portion from the high pressure accumulator to the low pressure line.Pressure regulator valve is controlled through an electric control device.It relates to a CR control gear in the case.It also controls the sparger of cylinder, is arranged on the Flow valve (metering valve) of high-pressure service pump front, receives about the sensing data of fuel temperature and rail pressure etc.

Control the system pressure in the high pressure accumulator at work in this wise, so that high pressure accumulator forms closure through discharge portion-pressure regulator valve.If the pressure in the high pressure accumulator surpasses a required system pressure, then pressure regulator valve is opened; If its pressure is lower than system pressure, then pressure regulator valve cuts out.This adjusting can be by the adjusting stack by Flow valve.Spray can be under the optimum state for fuel in cylinder thus, thus in the CR system since pressure produce and the injection that can realize that a cardinal principle is controlled by the characteristic curve group separating of actual ejection process.The CR control gear is except also regulating the pilot pressure modulating valve moment and the emitted dose to cylinder injection for the sparger of each cylinder through configuration.The course of injection of each cylinder is optimized dividually.

To one of this system important requirement such as said being: in Motor Vehicle for example aspect the control of CR system under the failure condition (for example sensor failure) this Motor Vehicle will go back drivable; For example in order to drive to a parking place or to arrive a maintenace point etc.; In other words, should on restricted technical specification, still can carry out the minimum operation or the emergency operating of internal-combustion engine at least.

Because the emergency operating pattern must be arranged, the discharge portion-pressure regulator valve of a CR system is made to the valve that turn-offs when not having electricity usually.The valve of opening when not having electricity will cause: the control gear like valve of nonserviceabling stayed open this valve when losing efficacy.This can not accomplish: in high pressure accumulator, set up one for the required pressure minimum of emergency operating.The valve of therefore cutting out when not having electricity for emergency operating pattern (in automotive field, also claiming " jogging home mode ") should additionally be provided with a pressure-limit valve; Its is constituted in this wise, thus only when surpass one predetermined open pressure after automatically in high pressure accumulator one of maintenance for the required pressure minimum of contingency mode.Corresponding pressure limiting function also can be combined in the pressure regulator valve itself.Therefore nonserviceable and at first to reach predetermined high the opening pressure or reach the pressure limiting function in the pressure regulator valve of pressure-limit valve down, until the emergency operating pattern or the jogging home mode that can realize reducing pressure.

Yet the shortcoming of this scheme is that this opens above 600 crust of system pressure that pressure for example can be in the CR system.This high pressure can bring secondary face to ring to the strength of parts of each parts of ejecting system.These parts relate in particular to the parts made from the extruding hardening method.Opening essential this fact that surpasses system pressure of pressure also with in the routine work is worth the system pressure of expectation further to raise opposed on know-why under the situation of given component technology specification.The requirement that conversely injecting-unit is used for the required enough strength of parts of emergency operating will cause corresponding cost up based on the raising that component materials is required.

In DE 103 34 615 A1, describe an ejecting system, wherein used the pressure regulator valve of opening when not having electricity.This pressure regulator valve is structurally implemented in this wise, promptly when the electromagnetism closing force loses, only just opens from predetermined minimum fuel pressure example 250 these valves of crust.Therefore make internal-combustion engine become possibility with this pressure minimum critical activity.But the there described pressure regulator valve complex structure and have expensive accordingly.When this ejecting system further develops, when for example using higher system pressure, this pressure regulator valve must design again.

Summary of the invention

Propose a throttle part that is used for the ejecting system of fuel combustion according to the present invention, wherein ejecting system comprises following part: a common high pressure accumulator is used for a plurality of cylinder fuelings to internal-combustion engine; A high-pressure service pump is so that reach on the high pressure level fuel in the high pressure accumulator; One by the pressure regulator valve of high pressure accumulator in the discharge portion of low pressure line; And a control gear that is used for the pilot pressure modulating valve, be used for when internal combustion engine, keeping a system pressure at high pressure accumulator.This pressure regulator valve is constituted in this wise, so that under unsteered situation, discharges discharge portion to low pressure line at least in part.Wherein can limit the fuel stream from the high pressure accumulator to the low pressure line like this through throttle part, so that guarantee in the high pressure accumulator one at least for the required minimum pressure of internal combustion engine according to the present invention.Throttle part can irrespectively be operated with the control of pressure regulator valve.

Pressure regulator valve can be the valve of opening when not having electricity, this valve for example when the control gear fault maybe when from the reason of reliability as owing to sensor failure control gear no longer during the pilot pressure modulating valve, discharge discharge portion at least in part.This control gear can relate to the CR control gear, and itself then can be integrated among the ECU (" electronic control unit ") of Motor Vehicle.

Throttle part for example can be by operation manually, as operating through automobile driver.Throttle part mechanically and/or electricly is operated in forms of implementation more of the present invention.Conversion ground or additionally is in case during the control fails of pressure regulator valve, for example throttle part is automatically operated when pressure regulator valve loses electric current.Conversion ground or additionally throttle part also can be through control gear, control like the ECU of CR control gear or Motor Vehicle, for example be used for the startup of emergency operating pattern.

Throttle part reaches a predetermined throttle position through operation in some forms of implementation.

Throttle part can be arranged in discharge portion or the low pressure line with pressure regulator valve on arranging dividually.Throttle part can be set at the front or the back of pressure regulator valve for the flow direction of fuel from the high pressure accumulator to the low pressure line.Throttle part can be set at that throttle part especially adapts to high pressure in some forms of implementation of back of pressure regulator valve therein.

Throttle part for example can comprise a throttle valve.Throttle part can comprise at least one primary importance and a second place; Wherein primary importance is the open position that is provided with for routine work; Throttle part does not limit or fuel limitation stream tinily only on this position, promptly only limits through the pressure regulator valve that is arranged in the discharge portion.The throttle position that the second place is provided with, is scheduled to for critical activity.Fuel limitation flows in this wise in this throttle position, a minimum pressure promptly in high pressure accumulator, occurs, so that can carry out the fuel injection and can correspondingly realize emergency operating.

Propose to be used for the pressure regulator valve of ejecting system in addition, this pressure regulator valve comprises one according to one in form of implementation throttle part of the present invention, described here.Throttle part especially can or be done in this valve with the pressure regulator valve combination.In according to a form of implementation of pressure regulator valve of the present invention when throttle part when operating and the control of control gear irrespectively be adjusted to through one of pressure regulator valve definite flow on or be no more than the flow that this is confirmed.Can limit a passage of opening when not having electricity for this reason, but or passage that control when throttle part controlled device when operating, through pressure regulator valve on hydraulic pressure, be separated out.And the passage that second of an associated ping or bypass conduit confirmed is passed through in release.

The last ejecting system that proposes to be used for fuel combustion according to the present invention, it comprises according to one in form of implementation throttle part of the present invention, described here and/or according to one in form of implementation pressure regulator valve of the present invention, described here.

In from the discharge portion of high pressure accumulator, for example do not have the pressure-limit valve that turn-offs when electric and be provided with one relatively and will allow the pressure of opening of when the emergency operating pattern occurring, avoiding high, this height to open pressure according to throttle part of the present invention to be provided with pressure regulator valve combination or that separate or pressure regulatory function one in traditional use and not have on the pressure regulator valve of closing when electric and will occur with one.Its consequence is that injecting-unit has corresponding little parts load in the high voltage rail.Mean conversely, in the ejecting system routine work, can improve system pressure.Additionally or conversion ground, the requirement that can adopt reduction to the employed material of parts is to reduce cost.

Allow independent pressure-limit valve of cancellation according to scheme of the present invention.But still the pressure regulator valve of opening can use conventional nothing electricity the time.One baroque, also be that the pressure regulator valve of under electroless state, when a predetermined pressure minimum, just opening is unnecessary (but the present invention can work with this valve).Throttle part appears in the pressure regulator valve capable of being combinedly according to the present invention.But also can adopt " building blocks case scheme ", wherein throttle part and pressure regulator valve are provided with dividually.This means that each function can be optimized respectively.This modularization will cause corresponding advantages, as make simplification such as exploitation, installation and dismounting, maintenance, trouble shoot.This is particularly useful for the further exploitation of ejecting system, for example in view of the desired further raising of system pressure in the routine work.

Set about to be transformed into the fade function that is used for the critical activity pattern in a stable condition is acceptable in the field of internal combustion engine of truck (" jogging go home function ") for example movingly.Therefore available simple mode embodies a minimum requirement, and this minimum requirements for example comprises the starting of internal-combustion engine or slowly going by this oil-engine driven Motor Vehicle.

Description of drawings

Describe others of the present invention and advantage thereof in detail by accompanying drawing now.Wherein accompanying drawing is represented:

Fig. 1: the constituent element of representing a traditional ejecting system that is used for fuel combustion with the form of block diagram;

Fig. 2 a: ejecting system that is provided with the pressure regulator valve that constitutes according to the present invention; And

Fig. 3 a: embodiment of the ejecting system that is provided with throttle part separately that constitutes according to the present invention.

The practical implementation form

In order to illustrate the present invention has summarily representedtraditional ejecting system 100 in Fig. 1 a form of implementation.This ejecting system or " rail altogether " (CR)system 100 are provided with 102, onehigh pressure accumulators 104 of a high-pressure service pump, 106, onepressure regulators 108 of a plurality of spargers and a control gear 110.Intakeline 112 is imported in thehigh pressure accumulator 104 through high-pressure service pump 102 by a fuel tank (not shown).Discharge conduit 114 is imported in the fuel tank throughpressure regulator valve 108 and through alow pressure line 116 as return line byhigh pressure accumulator 104.

High-pressure service pump 102 for example can relate to a hydraulic piston pump commonly used.High pressure accumulator 104 is a distribution piping (rail), and the fuel that is under the high pressure is flow in thesparger 106 by this distribution piping, controlled separatelydevice 110 controls of sparger.The valve of closing whenpressure regulator valve 108 is an electricity operation, nothing electricity; It is provided with (unshowned) pressure limiting function, for example under the situation that the pilot ofvalve 108 118 lost efficacy, still allows the emergency operating by the internal-combustion engine of ejectingsystem 100 fuelings thus.Ejecting system-as described here-for example can use on the internal-combustion engine of truck.

First embodiment of theejecting system 200 that expression constitutes according to the present invention among Fig. 2.This system comprises 202, onehigh pressure accumulators 204 of a high-pressure service pump, 206, onepressure regulator valves 208 of a plurality of spargers and the return line in thefuel tank 212 that leads to that is configured low pressure line 210.Pressure regulator valve 208 additionally is provided with athrottle part 218 also separatedly in thedischarge portion 216 ofhigh pressure accumulator 204.

Also can be additionally to the parts shown in Fig. 2, ejectingsystem 200 is provided with other parts, for example is provided with a pressure regulator valve (batching unit) that is connected high-pressure service pump 202 fronts; A rail pressure sensor; Fuel temperature sensor, another fuel transfer pump, filter etc.; These parts have been omitted in the drawings from clear and concise reason.

Control gear 214 can relate to the CR control gear, and this control gear itself can be integrated among the ECU (electronic control unit) of Motor Vehicle.Thesecontrol gear 214major control spargers 206 receive data etc. by the sensor (not shown).At ejectingsystem 200 routine work time-control apparatuss 214 pilotpressure modulating valve 208 in this wise, so that inhigh pressure accumulator 204, keep a required system pressure.

Pressure regulator valve 208 relates to a valve of opening when not having electricity; In other words; The pressure limiting function is confirmed through the maximum magnetic force that can have; And whenvalve 208 controlleddevices 214 turn-off no current throughpilot 220, this valve is retained in that open, the state that do not limit discharge portion 216 (at this moment continue restriction through throttle part pressure decline fast can not be arranged).This is suitable for whenpilot 220 because fault machinery or electricity can not be transmitted the situation of electrical signal to pressure regulator valve equally, for example when a contact oflead 220 or plug relaxes or is corroded or lead 220 when breaking off fully.Also can consider other cause of failures.For example sensor failure is followed control gear and is for example made pressure regulator valve turn-off no current from the reason of reliability according to the failure response countermeasure.

Therefore fuel is flow in thefuel tank 212 throughdischarge portion 216 and low pressure line 210 (returning) bystorage 204 in the case.In order to allow at least emergency operating by the internal-combustion engine of ejectingsystem 200 fuelings in the case, afunctional unit 222 of essentialoperation throttle part 218limits discharge portion 216 thus and can keep the pressure minimum in thestorage 204 thus.

Throttle part 218 is provided with at least two positions, i.e. a through-flow channel 224 and a through-flow channel 226.Passage 224 is released in primary importance as shown in Figure 2.Passage 224 is the passages that do not limit, and does not promptly limit discharge portion 216.In order to reach the manually-operable that critical activity is provided with functional unit 222.The second place ofthrottle part 218 is discharged, makepassage 224 anddischarge portion 216discharge portion 226 is connected on thesecond channel 226 separating on the hydraulic pressure and the substitute is on this position.Thispassage 226 causes the restriction todischarge portion 216, so that in high pressure accumulator, can set up for the required minimum pressure of critical activity.

Functional unit 222 can comprise the functional unit of a machinery, and it for example must be operated through automobile driver in engine compartment, so that the emergency operating of permission Motor Vehicle is like the jogging home mode.Conversion ground or additionally thisfunctional unit 222 can comprise an electric functional unit, for example produce a signal and givethrottle part 218 through fax through a button in the operation operator cabin etc.

The operation ofoperation equipment 222 also can realize through control gear 214 (or another ECU) in another embodiment; For example whencontrol gear 214 is determined a fault state; At this momentpressure regulator valve 208 no longer can reach control throughpilot 220; Or because thispressure regulator valve 208 is essential does not have electricity and turn-off, as when the sensor fault.But prerequisite in the case is: irrespectively controlthrottle part 218 through thecontrol gear 214 and thepilot 220 of pressure regulator valve 208.Whencontrol gear 214 own faults for example, do not belong to this situation.Therefore will preferably combined through the control ofcontrol gear 214 with a manually-operable possibility, in case or pressure regulator when losing electric current, realize changing automatically (the for example reaction through internal system, as by a spring).A manually operated possibility also can comprise an electricity operation, yet this preferably is provided with an independent or reliable power supply.

Along with to once operating again ofparts 222 second channel being separated on hydraulic pressure again and thepassage 224 that does not limit being connected again in the discharge portion 216.This for example can so realize, promptly is excluded the back pressure regulator valve in the fault that occurs and can carries out its work again.

Becausethrottle part 218 is arranged in thedischarge portion 216 withpressure regulator valve 208 dividually, the characteristic ofthrottle part 218 andpressure regulator valve 208 can be optimized with being independent of each other.Pressure regulator valve 208 needn't be provided with the pressure limiting function or open the special opening characteristic of situation for no current.Therefore can use standardized subordinate's parts for pressure regulator valve.

Be set at the front ofpressure regulator valve 208 in the embodiment shown in Figure 2 throughreturn line 210throttle part 218 to the flow direction of fuel tank fromhigh pressure accumulator 204 for fuel.Throttle part also can be arranged on the back of pressure regulator valve in another embodiment.Throttle part possibly be in the area of low pressure in routine work in the case.In the situation of pressure regulator valve fault or no current conversion next along with acting on the throttle part for the required high relatively pressure of pressure minimum of critical activity, thus throttle part preferably also is made to and is fit to high pressure in this layout.

An embodiment of theejecting system 300 that expression constitutes according to the present invention among Fig. 3.Thissystem 300 is provided with 302, onehigh pressure accumulators 304 of a high-pressure service pump and a plurality ofspargers 306 that are connected, and a pressure regulator valve 308.Adischarge portion 310 is by thereturn line 312 importing fuel tanks 314 ofhigh pressure accumulator 304 through pressure regulator valve 307 and low pressure line form.Pressure regulator valve 308 is by 316 controls of a control gear.

The parts of ejectingsystem 300 on its enforcement and working method can each corresponding to Fig. 2 in the parts ofsystem 200, and relevant therewith mode of execution no longer repeat specification here.

Pressure regulator valve 308 is made to the pressure regulator valve of opening when not having electricity.Above-mentionedly also be applicable to this with reference to being described on its meaning of the valve shown in Fig. 2.

Inpressure regulator valve 308, made up athrottle part 320 byfunctional unit 318 expressions according to the present invention.Thisthrottle part 320 can as above regard to throttle part independent among Fig. 2 218 described modes and work on its meaning.Operation throughthrottle part 320 will not have the fuel stream that limits in this wise in the electric state of opening fromhigh pressure accumulator 304 atpressure regulator valve 308, so that inhigh pressure accumulator 304, can keep a minimum pressure and allow emergency operating thus.Functional unit 318 can irrespectively be operated through the control ofcontrol gear 316 withpressure regulator valve 308, and promptly thethrottle part 320 in the combinedpressure regulating valve 308 especially can be operated when the pilot that is used for pilotpressure modulating valve 308 322 faults.

Throttle part 320 always can use existing current-limiting apparatus inpressure regulator valve 308; Thepressure regulator valve 308 that for example wherein is provided with thethrottle part 320 of combination only has a through-flow channel; This through-flow channel manually is adjusted on the predetermined flow when having operatedparts 318, even in the nothing electricity open mode ofpressure regulator valve 308, also can reach a predetermined flow with this method of applying.Conversionground valve arrangement 308/320 can comprise two passages.A passage that in routine work, uses will separately be reached on hydraulic pressure discharge definite bypass of independent (in advance), as described above being similar to reference to two passages ofthrottle part 218.

The throttle part combination in discharge portion-pressure regulator valve as shown in Figure 3 will allow to save according to additional function of the present invention the arrangement of position, but the existing current-limiting function of working pressure modulating valve always under certain condition wherein.

The present invention is not limited in embodiment described here and reaches on the aspect of wherein being given prominence to; And in the scope that provides by dependent claims, can have many variations, these variations are in the professional scope of professional workforce.

Claims (10)

1. the throttle part that is used for the ejecting system of fuel combustion, wherein, this ejecting system (200,300) comprises following:

Common high pressure accumulator (204,304) is used for a plurality of cylinder fuelings to internal-combustion engine;

High-pressure service pump (202,302) is so that reach on the high pressure level fuel in this high pressure accumulator;

By the pressure regulator valve (208,308) of this high pressure accumulator in the discharge portion (216,310) of low pressure line (210,312); And

Be used to control the control gear (214,316) of this pressure regulator valve (208,308), be used for when internal combustion engine, in this high pressure accumulator (204,304), keeping system pressure;

Wherein, this pressure regulator valve (208,308) constitutes in this wise, thus its release should discharge portion (216,310) in this low pressure line (210,312) at least in part under not controlled situation; And

Wherein, can limit like this from this high pressure accumulator (204 through this throttle part (218,320); 304) to this low pressure line (216; 312) fuel in stream, thus guarantee at least in this high pressure accumulator (204,304) for the required minimum pressure of internal combustion engine;

Wherein, this throttle part (218,320) can irrespectively be operated with the control of this pressure regulator valve (208,308).

2. according to the throttle part of claim 1, wherein, said throttle part (218,320) can manually be operated.

3. according to the throttle part of claim 1 or 2, wherein, said throttle part (218,320) mechanically and/or electricity ground operated, and/or, in case during the control fails of said force regulating valve, said throttle part is automatically operated.

4. according to each throttle part in the above claim, wherein, said throttle part (218) is arranged in said discharge portion (216) or the low pressure line for the layout of separating with said pressure regulator valve (208).

5. according to each throttle part in the above claim, wherein, said throttle part (218,320) reaches in the predetermined throttle position (226) through operation.

6. according to the throttle part of claim 5; Wherein, Said throttle part (218) comprises at least one primary importance (224) and a second place (226); Wherein, said primary importance (224) is the open position that is provided with for routine work and the said second place (226) for critical activity is provided with, predetermined throttle position.

7. the pressure regulator valve (308) that is used for ejecting system (300) comprises according to each throttle part (320) in the above claim.

8. according to the pressure regulator valve of claim 7, wherein, when the said throttle part of operation (320), with control through said control gear (316) irrespectively a definite flow that passes through said pressure regulator valve (308) be conditioned out or be not exceeded.

9. according to the pressure regulator valve of claim 7 or 8, wherein, when the said throttle part of operation (320), one can be separated out on hydraulic pressure by passage said control gear (308) control, through said pressure regulator valve (308).

10. the ejecting system (200,300) that is used for fuel combustion, comprise according in the claim 1 to 6 each throttle part (218,320) and/or according to each pressure regulator valve (308) in the claim 7 to 9.

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