CN101806266B - Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector - Google Patents
Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector Download PDFInfo
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- CN101806266B CN101806266B CN2010101173230A CN201010117323A CN101806266B CN 101806266 B CN101806266 B CN 101806266B CN 2010101173230 A CN2010101173230 A CN 2010101173230A CN 201010117323 A CN201010117323 A CN 201010117323A CN 101806266 B CN101806266 B CN 101806266B
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- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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- 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
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- 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
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- 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
- F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
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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
The invention provides a double-valve fuel injecting device with an electric-control monoblock pump and an electric-control fuel injector, comprising the electric-control monoblock pump, a high-pressure fuel pipe and the electric-control fuel injector. The double-valve fuel injecting device is characterized in that a pressure accumulator and electromagnetic valves are arranged on the electric-control fuel injector, an inlet of the pressure accumulator is connected with the electric-control monoblock pump through the high-pressure fuel pipe, an outlet of the pressure accumulator is connected with a fuel inlet hole of the electric-control fuel injector, and the electromagnetic valves are installed on a throttle valve of the electric-control fuel injector and are connected with the throttle valve. Through the matching control on the electromagnetic valves of the monoblock pump and the electric-control fuel injector, the double-valve fuel injecting device can eliminate the influence of the rotary speed of a diesel engine on fuel injection pressure, inhibit the influence of pressure oscillation in the fuel injection process on the fuel injection, and flexibly control accumulating pressure before the fuel injection and the opening pressure of a fuel injection needle valve, thereby realizing the flexible control on the fuel injection pressure and the injection rule; and then the double-valve fuel injecting device satisfies the requirements of the diesel engine for the fuel injection when the diesel engine runs under different working conditions, improves the economical efficiency and the dynamic property of the diesel engine, and reduces the discharge of harmful matters.
Description
Technical field
The present invention relates to a kind of fuel injection apparatus, particularly relate to the fuel injection apparatus that satisfies the full operating mode eject request of big-and-middle-sized diesel engine.
Background technique
In recent years, diesel engine electric controlled fuel injection technology has obtained developing rapidly, and increasing diesel engine has assembled electric control fuel oil jet system.General; Electric control fuel oil jet system comprises electronically controlled unit pump, high-pressure oil pipe and oil sprayer; Utilize the quick response of automatically controlled device, realize Fuel Injection Quantity for Diesel and fuel injection characteristic are controlled fast, accurately, to reach the purpose that improves engine fuel economy, power character and reduction noxious emission.
Current; Be applied to the electronic control injection system of big-and-middle-sized diesel engine; Can improve to a certain extent fuel-injected has been controlled; But still exist many deficiencies, remain further to optimize and improve: one, except that Common rail fuel injection system, the foundation of diesel engine fuel injection system fuel-injection pressure and the rotating speed of diesel engine are closely related.When diesel engine during at high rotating speed, fuel-injection pressure is higher, can satisfy the requirement of fuel injection and burning; But under the slow-speed of revolution, fuel-injection pressure is lower, and atomization quality is poor; Can cause combustion process to worsen, to such an extent as to engine fuel economy is relatively poor, noxious emission is also more serious.Two, not enough to the fuel-injected control ability, be difficult to realize flexible control to injection pressure and fuel injection characteristic, satisfied not the requirement of diesel engine under various operating modes.Three, diesel fuel injection system is difficult to overcome conformity and repeatability are sprayed in pressure surge to diesel engine fuel jetting characteristic and each cylinder influence.Four, current high-pressure common rail fuel injection technology can solve the flexible control to injection pressure, jet law; Also can surge suppressing to the influence of fuel spray characteristic; But the cost of high-pressure common rail injection system is higher, and reliability is low, and cost performance is lower.
Summary of the invention
The invention reside in provides a kind of and can control fast, accurately Fuel Injection Quantity for Diesel and fuel injection characteristic, to reach the electronically controlled unit pump and the electric-controlled fuel injector bivalve fuel injection apparatus of the purpose that improves engine fuel economy, power character and reduction noxious emission.
The objective of the invention is to realize like this: the present invention includes electronically controlled unit pump 1, high-pressure oil pipe 37 and pressure accumulation type electric-controlled fuel injector 41; Accumulator 39 and solenoid valve 43 are set on the electric-controlled fuel injector 41; The import of accumulator 39 links to each other with electronically controlled unit pump 1 through high-pressure oil pipe 37; The outlet of accumulator 39 links to each other with the oil inlet hole 66 of electric-controlled fuel injector 41, and solenoid valve 43 is installed in above the throttle valve 56 of electric-controlled fuel injector 41, and coupled.
Advantage of the present invention is: through the cooperation control to monoblock pump solenoid valve and pressure accumulation type electric-controlled fuel injector solenoid valve; Can get rid of the influence of diesel engine speed to fuel-injection pressure; Pressure surge influences fuel-injected in the inhibition injection process; Suppress the phase mutual interference of each cylinder injector course of injection, control the preceding pressure accumulation pressure of fuel injection and the cracking pressure of fuel injection needle neatly, thereby realize flexible control fuel-injection pressure and jet law; To the fuel-injected requirement, improve engine fuel economy, power character and also reduce emission of harmful substances when satisfying diesel engine and under different operating modes, moving.
Description of drawings
Fig. 1 is the first embodiment of the invention structural representation.
Fig. 2 is the second embodiment of the invention structural representation.
Fig. 3 is the structural representation of monoblock pump top solenoid valve part and oil circuit in first, second mode of execution of the present invention.
Fig. 4 is the structural representation of roller tappet part in monoblock pump bottom in first, second mode of execution of the present invention.
Fig. 5 is the accumulator and the electromagnetic valve part-structure schematic representation of electric-controlled fuel injector in the first embodiment of the invention.
Fig. 6 is the accumulator and the electromagnetic valve part-structure schematic representation of electric-controlled fuel injector in the second embodiment of the invention.
Fig. 7 is the nozzle segment structural representation of electric-controlled fuel injector in first, second mode of execution of the present invention.
Fig. 8 is the spacing hole plate structure schematic representation of electric-controlled fuel injector in first, second mode of execution of the present invention.
Fig. 9 is the nozzle arrangements schematic representation of electric-controlled fuel injector in first, second mode of execution of the present invention.
Embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
Mode of execution 1:
Electronic unit pump body 1 is installed in the pump box casing 7; Control spool 13 is installed in the spool of the pump housing 1 and installs in the emptying aperture, and electromagnetic valve body 8, electromagnet 9, armature 10, electromagnetic coil 11, armature fastening screw trip bolt 14, adjustment backing plate 15, block 16, control valve core reseting spring 17, control spool spring seat 18 etc. and control spool 13 have constituted the fuel feeding electromagnetic valve part of monoblock pump jointly.Electromagnet 9, adjustment backing plate 15 and cover plate 20 are connected on the pump housing 1 through stay bolt 21, and form seal action through 27,28 pairs of fuel oils of seal ring.Be processed with and control the sealing taper hole that spool 13 sealing cones are fitted on the pump housing 1, this place is the current by pass of fuel oil.Armature 10 is connected as a single entity through fastening screw trip bolt 14 and control spool 13, makes control spool 13 together to move with armature 10 through the electromagnetic force effect of 9 pairs of armature 10 of electromagnet, thereby closes or open the current by pass of fuel oil.Adjustment backing plate 15 and block 16 have been formed stroke and the air gap regulating mechanism of armature 10, control armature 10 stroke and and electromagnet 9 between air gap.Monoblock pump by electronic control unit (ECU) under different operating modes; The input signal of gathering engine sensor drives the monoblock pump solenoid valve; Thereby the closure and the opening time of control control spool 13; Switching is sent high pressure fuel into oil sprayer by the flow direction of the fuel oil of plunger 2 pressure oil motion generations, and its pump end pressure reaches as high as 1800bar.When electromagnet 9 is switched under the control of electronic control unit (ECU); Armature 10 drives the direction motion of control spool 13 to electromagnet 9 under the electromagnetic force effect of electromagnet 9, the fuel oil current by pass is closed, and fuel oil raises rapidly in the effect downforce that plunger 2 moves upward; High pressure fuel is pushed orifice valve 22 open; Get in the oil sprayer through high-pressure oil pipe 37, after pressure is put aside to a certain degree, by electronic control unit (ECU) control oil sprayer high pressure fuel is sprayed in the cylinder again.When electronic control unit (ECU) stops to electromagnet 9 energisings; Under the spring force effect of control valve core reseting spring 17, control spool 13 is opened the current by pass of fuel oil again to the direction motion of leaving electromagnet 9; The high pressure fuel earial drainage; Pressure descends rapidly, and orifice valve 22 is closed, and fuel feeding finishes.After getting into the cam profile descending branch, plunger 2 moves downward under the effect of piston spring 5, by 31,32,33 oil suctions of oil inlet and oil return hole, makes to be full of fuel oil in the plunger hole again, for fuel feeding is next time got ready.Orifice valve 22, fuel-displaced plug 23, orifice valve spring 24 are installed in the oil outlet place of the pump housing 1 top, in order to the fuel oil that gets into oil sprayer throttling action to be provided, to prevent secondary injection and produce air pocket, improve injection characteristics.Plunger 2, tappet 3, piston spring 5, spring seat 6 connect into an integral body, under the driving action of fuel cam pair roller 4, accomplish plunger 2 reciprocating pressure oil and oil suction actions jointly.Have control spool mounting hole, oil inlet hole 29, ring shaped oil passage 30 on the pump housing, oil inlet and oil return hole 31,32,33.Oil inlet and oil return hole 31,32,33 all links to each other with ring shaped oil passage 30, and ring shaped oil passage is formed the oil pocket that seals through seal ring 25,26, the pump housing 1 and pump box casing 7, makes that the fuel oil in the ring shaped oil passage 30 can not revealed.Oil inlet and oil return hole 31,32 links to each other with oilhole on the control spool 13 two ends pump housings 1, for plunger 2 is pressed oily and oil suction that path is provided and played the effect of the pressure reduction at Balance Control spool 13 two ends.
High-pressure oil pipe 37, high-pressure oil pipe joint 36,38 have connected monoblock pump and pressure accumulation type electric-controlled fuel injector.
The pressure accumulation type electric-controlled fuel injector has accumulator 39; Be installed in the top of pressure accumulation type electric-controlled fuel injector; The pressure accumulation chamber 40 of accumulator 39 can reduce to pulse pressure surge that fuel feeding causes, regulate fuel injection rate and guarantee in injection process along with the fuel injection injection pressure can not fall fast; Make high pressure fuel keep higher jet pressure as far as possible and spray into cylinder, and can reduce influencing each other between adjacent cylinder injection and the multi-injection.Electromagnetic valve body 43 in the oil sprayer, electromagnet 44, armature 47, stop ring 48,52, control valve core reseting spring 49, control spool 51, armature Regulation spring 53, adjustment ring 54, armature Regulation spring seat 55, throttle valve valve body 56 etc. have constituted the solenoid fuel injection valve control section of pressure accumulation type oil sprayer.Control spool 51 is stuck on the armature 47 by stop ring 48 and is attached thereto and is one, and control spool 51 together moves with armature 47 through the electromagnetic force effect of 44 pairs of armature 47 of electromagnet, thereby closes or open the throttle orifice on the throttle valve valve body 56.The stroke of armature 47 and and the air gap of 44 of electromagnet by control valve core reseting spring 49 and 53 adjustment of armature Regulation spring.Under different operating modes, the input signal that electronic control unit is gathered engine sensor drives fuel injector magnetic system, thereby control control spool 51 is opened and the throttle orifice of closed throttle valve valve body 56, and high pressure fuel is sprayed into cylinder in good time.When electromagnet 44 is not switched on; Control spool 51 is under the spring force effect of control valve core reseting spring 49; Utilize the ball valve of its front end to seal the throttle orifice on the throttle valve valve body 56, make that fuel pressure and the pressure chamber's 67 interior fuel pressures in the control chamber 77 are consistent.At this moment; Control piston 57 is pressed to needle-valve return spring holder 61 under the pressure effect of control chamber 77 mesohigh fuel oils, through needle-valve return spring holder 61 control chamber 77 mesohigh fuel pressures are applied to fuel injection needle 64 tops, so; Fuel injection needle 64 is under the acting in conjunction of the spring force of control chamber 77 intermediate fuel oil pressure and needle-valve Returnning spring 58; Press to nozzle 63, sealing oil sprayer spray orifice, not oil spout of oil sprayer.When 44 energisings of electronic control unit (ECU) control electromagnet; Armature 47 drives the direction motion of control spool 51 to electromagnet 44 under the electromagnetic force effect of electromagnet 44; Throttle orifice on the throttle valve valve body 56 is opened, the high pressure fuel earial drainage in the control chamber 77, and control chamber 77 internal pressures reduce rapidly; Fuel injection needle 64 overcomes needle-valve Returnning spring 58 under the pressure effect of pressure chamber's 67 inner high voltage fuel oils spring force promotion control piston 57 upwards lifts commencement of fuel injection.After electronic control unit (ECU) stops to electromagnet 44 energisings; Control spool 51 is taken a seat under the effect of control valve core reseting spring 49; Utilize the throttle orifice on the ball valve closed valve 56 of its front end; In control chamber 77, rebulid high pressure, made control piston 57 that the pressure of high pressure fuel is applied to fuel injection needle 64 tops through needle-valve return spring holder 61 once more, fuel injection needle 64 is taken a seat rapidly under the acting in conjunction of the spring force of control chamber 77 mesohigh fuel pressures and needle-valve Returnning spring 58; Sealing oil sprayer spray orifice stops oil spout.Spacing orifice plate 62 all has four oilholes that are uniformly distributed with at circumference with nozzle 63, in order to increase the actual internal area of high pressure fuel.Spacing orifice plate 62 also plays the lift and the effect of supporting needle-valve return spring holder 61 of restriction fuel injection needle 64.Be processed with pressure chamber 67 in the nozzle 63, and leading role be provided for fuel injection needle.
During fuel feeding, the current by pass of fuel oil is not held open monoblock pump, and the fuel oil that is promoted by plunger 2 flows back to fuel tank through current by pass; When fuel feeding begins; 9 energisings of electronic control unit (ECU) control electromagnet; Armature 10 drives the direction motion of control spool 13 to electromagnet 9 under the electromagnetic force effect of electromagnet 9, close the fuel oil current by pass, and fuel oil raises rapidly in the compression downforce of plunger 2; High pressure fuel is pushed orifice valve 22 open, gets in the oil sprayer through high-pressure oil pipe 37.Before oil sprayer does not carry out oil spout, the throttle orifice of the control spool 51 of oil sprayer on sealing throttle valve valve body 56 under the spring force effect of control valve core reseting spring 49.Therefore, along with continuing to increase of monoblock pump supply time, fuel oil is constantly put aside because of in the pressure accumulation chamber 40 of oil sprayer accumulator 39, reaching in the high pressure fuel path, and makes the pressure of fuel oil constantly raise.
During fuel injection beginning; 44 energisings of electronic control unit (ECU) control electromagnet, armature 47 drive the direction motion of control spool 51 to electromagnet 44 under the electromagnetic force effect of electromagnet 44, the throttle orifice on the throttle valve valve body 56 is opened; High pressure fuel earial drainage in the control chamber 77; Its internal pressure reduces rapidly, and fuel injection needle 64 overcomes needle-valve Returnning spring 58 under the pressure effect of pressure chamber's 67 mesohigh fuel oils spring force promotion control piston 57 upwards lifts commencement of fuel injection.
During end of injection; Electromagnet 44 outage under electronic control unit (ECU) control; Control spool 51 is taken a seat rapidly under the effect of control valve core reseting spring 49, utilizes the throttle orifice on the ball valve closed valve 56 of its front end, in control chamber 77, has rebulid high pressure; Make control piston 57 that the pressure of high pressure fuel is applied to fuel injection needle 64 tops through needle-valve return spring holder 61 once more; Fuel injection needle 64 is taken a seat rapidly under the acting in conjunction of the spring force of control chamber 77 mesohigh fuel pressures and needle-valve Returnning spring 58, and sealing oil sprayer spray orifice stops oil spout.
After end of injection; Electromagnet 9 outage under electronic control unit (ECU) control, control spool 13 to the direction motion of leaving electromagnet 9, are opened the current by pass of fuel oil again under the effect of the spring force of control valve core reseting spring 17; The high pressure fuel earial drainage; Pressure descends rapidly, and orifice valve 22 is closed, and fuel feeding finishes.After getting into the cam profile descending branch, plunger 2 moves downward under the effect of piston spring 5, by 31,32,33 oil suctions of oil inlet and oil return hole, makes to be full of fuel oil in the plunger hole again, for fuel feeding is next time got ready.
Because before fuel injection beginning, fuel oil has the process of a savings pressure in the pressure accumulation chamber 40 of oil sprayer accumulator 39 and in the path of high pressure fuel, make that the fuel oil in this Fuel Injection Control Device can reach higher pressure; Improved fuel pressure on the one hand; Make that when injection beginning with respect to other fuel injection systems, the jet pressure of fuel oil is higher; Injection rate is faster, the oil atomizing better quality; On the other hand, higher fuel pressure makes that the cracking pressure of fuel injection needle 64 is higher, and opening speed is faster.
At after end of injection and since monoblock pump fuel feeding process continue carry out and the pressure accumulation effect in pressure accumulation type oil sprayer pressure accumulation chamber 40, fuel oil still can keep higher pressure.Therefore, when electromagnet 44 outage under electronic control unit (ECU) control, control spool 51 is taken a seat rapidly under the effect of control valve core reseting spring 49, behind the throttle orifice on the sealing throttle valve valve body 56.The fuel pressure that in control chamber 77, has rebulid is also higher; The acting in conjunction of the spring force of this fuel pressure and needle-valve Returnning spring 58; Make that taking a seat of fuel injection needle 64 is rapider; Reached the purpose of rapid oil-break, and, can realize the multi-injection of fuel oil through the powering on once more of electromagnet 44.
Through cooperation control to monoblock pump solenoid valve and pressure accumulation type fuel injector magnetic system; Can get rid of the influence of diesel engine speed to fuel-injection pressure; Pressure surge influences fuel-injected in the inhibition injection process; The pressure accumulation pressure before the control fuel injection and the cracking pressure of fuel injection needle have realized the flexible control to fuel-injection pressure and jet law flexibly.
Mode of execution 2:
Electronic unit pump body 1 is installed in the pump box casing 7; Control spool 13 is installed in the spool of the pump housing 1 and installs in the emptying aperture, and electromagnetic valve body 8, electromagnet 9, armature 10, electromagnetic coil 11, armature fastening screw trip bolt 14, adjustment backing plate 15, block 16, control valve core reseting spring 17, control spool spring seat 18 etc. and control spool 13 have constituted the fuel feeding electromagnetic valve part of monoblock pump jointly.Electromagnet 9, adjustment backing plate 15 and cover plate 20 are connected on the pump housing 1 through stay bolt 21, and form seal action through 27,28 pairs of fuel oils of seal ring.Be processed with and control the sealing taper hole that spool 13 sealing cones are fitted on the pump housing 1, this place is the current by pass of fuel oil.Armature 10 is connected as a single entity through fastening screw trip bolt 14 and control spool 13, makes control spool 13 together to move with armature 10 through the electromagnetic force effect of 9 pairs of armature 10 of electromagnet, thereby closes or open the current by pass of fuel oil.Adjustment backing plate 15 and block 16 have been formed stroke and the air gap regulating mechanism of armature 10, control armature 10 stroke and and electromagnet 9 between air gap.Monoblock pump by electronic control unit (ECU) under different operating modes; The input signal of gathering engine sensor drives the monoblock pump solenoid valve; Thereby the closure and the opening time of control control spool 13; Switching is sent high pressure fuel into oil sprayer by the flow direction of the fuel oil of plunger 2 pressure oil motion generations, and its pump end pressure reaches as high as 1800bar.When electromagnet 9 is switched under the control of electronic control unit (ECU); Armature 10 drives the direction motion of control spool 13 to electromagnet 9 under the electromagnetic force effect of electromagnet 9, the fuel oil current by pass is closed, and fuel oil raises rapidly in the effect downforce that plunger 2 moves upward; High pressure fuel is pushed orifice valve 22 open; Get in the oil sprayer through high-pressure oil pipe 37, after pressure is put aside to a certain degree, by electronic control unit (ECU) control oil sprayer high pressure fuel is sprayed in the cylinder again.When electronic control unit (ECU) stops to electromagnet 9 energisings; Under the spring force effect of control valve core reseting spring 17, control spool 13 is opened the current by pass of fuel oil again to the direction motion of leaving electromagnet 9; The high pressure fuel earial drainage; Pressure descends rapidly, and orifice valve 22 is closed, and fuel feeding finishes.After getting into the cam profile descending branch, plunger 2 moves downward under the effect of piston spring 5, by 31,32,33 oil suctions of oil inlet and oil return hole, makes to be full of fuel oil in the plunger hole again, for fuel feeding is next time got ready.Orifice valve 22, fuel-displaced plug 23, orifice valve spring 24 are installed in the oil outlet place of the pump housing 1 top, in order to the fuel oil that gets into oil sprayer throttling action to be provided, to prevent secondary injection and produce air pocket, improve injection characteristics.Plunger 2, tappet 3, piston spring 5, spring seat 6 connect into an integral body, under the driving action of fuel cam pair roller 4, accomplish plunger 2 reciprocating pressure oil and oil suction actions jointly.Have control spool mounting hole, oil inlet hole 29, ring shaped oil passage 30 on the pump housing, oil inlet and oil return hole 31,32,33.Oil inlet and oil return hole 31,32,33 all links to each other with ring shaped oil passage 30, and ring shaped oil passage is formed the oil pocket that seals through seal ring 25,26, the pump housing 1 and pump box casing 7, makes that the fuel oil in the ring shaped oil passage 30 can not revealed.Oil inlet and oil return hole 31,32 links to each other with oilhole on the control spool 13 two ends pump housings 1, for plunger 2 is pressed oily and oil suction that path is provided and played the effect of the pressure reduction at Balance Control spool 13 two ends.
High-pressure oil pipe 37, high-pressure oil pipe joint 36,38 have connected monoblock pump and pressure accumulation type electric-controlled fuel injector.
The pressure accumulation type electric-controlled fuel injector has accumulator 39; Be installed in the side of pressure accumulation type electric-controlled fuel injector; The pressure accumulation chamber 40 of accumulator 39 can reduce to pulse pressure surge that fuel feeding causes, regulate fuel injection rate and guarantee in injection process along with the fuel injection injection pressure can not fall fast; Make high pressure fuel keep higher jet pressure as far as possible and spray into cylinder, and can reduce influencing each other between adjacent cylinder injection and the multi-injection.Electromagnetic valve body 43 in the oil sprayer, electromagnet 44, armature 47, stop ring 48,52, control valve core reseting spring 49, control spool 51, armature Regulation spring 53, adjustment ring 54, armature Regulation spring seat 55, throttle valve valve body 56 etc. have constituted the solenoid fuel injection valve control section of pressure accumulation type oil sprayer.Control spool 51 is stuck on the armature 47 by stop ring 48 and is attached thereto and is one, and control spool 51 together moves with armature 47 through the electromagnetic force effect of 44 pairs of armature 47 of electromagnet, thereby closes or open the throttle orifice on the throttle valve valve body 56.The stroke of armature 47 and and the air gap of 44 of electromagnet by control valve core reseting spring 49 and 53 adjustment of armature Regulation spring.Under different operating modes, the input signal that electronic control unit is gathered engine sensor drives fuel injector magnetic system, thereby control control spool 51 is opened and the throttle orifice of closed throttle valve valve body 56, and high pressure fuel is sprayed into cylinder in good time.When electromagnet 44 is not switched on; Control spool 51 is under the spring force effect of control valve core reseting spring 49; Utilize the ball valve of its front end to seal the throttle orifice on the throttle valve valve body 56, make that fuel pressure and the pressure chamber's 67 interior fuel pressures in the control chamber 77 are consistent.At this moment; Control piston 57 is pressed to needle-valve return spring holder 61 under the pressure effect of control chamber 77 mesohigh fuel oils, through needle-valve return spring holder 61 control chamber 77 mesohigh fuel pressures are applied to fuel injection needle 64 tops, so; Fuel injection needle 64 is under the acting in conjunction of the spring force of control chamber 77 intermediate fuel oil pressure and needle-valve Returnning spring 58; Press to nozzle 63, sealing oil sprayer spray orifice, not oil spout of oil sprayer.When 44 energisings of electronic control unit (ECU) control electromagnet; Armature 47 drives the direction motion of control spool 51 to electromagnet 44 under the electromagnetic force effect of electromagnet 44; Throttle orifice on the throttle valve valve body 56 is opened, the high pressure fuel earial drainage in the control chamber 77, and control chamber 77 internal pressures reduce rapidly; Fuel injection needle 64 overcomes needle-valve Returnning spring 58 under the pressure effect of pressure chamber's 67 inner high voltage fuel oils spring force promotion control piston 57 upwards lifts commencement of fuel injection.After electronic control unit (ECU) stops to electromagnet 44 energisings; Control spool 51 is taken a seat under the effect of control valve core reseting spring 49; Utilize the throttle orifice on the ball valve closed valve 56 of its front end; In control chamber 77, rebulid high pressure, made control piston 57 that the pressure of high pressure fuel is applied to fuel injection needle 64 tops through needle-valve return spring holder 61 once more, fuel injection needle 64 is taken a seat rapidly under the acting in conjunction of the spring force of control chamber 77 mesohigh fuel pressures and needle-valve Returnning spring 58; Sealing oil sprayer spray orifice stops oil spout.Spacing orifice plate 62 all has four oilholes that are uniformly distributed with at circumference with nozzle 63, in order to increase the actual internal area of high pressure fuel.Spacing orifice plate 62 also plays the lift and the effect of supporting needle-valve return spring holder 61 of restriction fuel injection needle 64.Be processed with pressure chamber 67 in the nozzle 63, and leading role be provided for fuel injection needle.
During fuel feeding, the current by pass of fuel oil is not held open monoblock pump, and the fuel oil that is promoted by plunger 2 flows back to fuel tank through current by pass; When fuel feeding begins; 9 energisings of electronic control unit (ECU) control electromagnet; Armature 10 drives the direction motion of control spool 13 to electromagnet 9 under the electromagnetic force effect of electromagnet 9, close the fuel oil current by pass, and fuel oil raises rapidly in the compression downforce of plunger 2; High pressure fuel is pushed orifice valve 22 open, gets in the oil sprayer through high-pressure oil pipe 37.Before oil sprayer does not carry out oil spout, the throttle orifice of the control spool 51 of oil sprayer on sealing throttle valve valve body 56 under the spring force effect of control valve core reseting spring 49.Therefore, along with continuing to increase of monoblock pump supply time, fuel oil is constantly put aside because of in the pressure accumulation chamber 40 of oil sprayer accumulator 39, reaching in the high pressure fuel path, and makes the pressure of fuel oil constantly raise.
During fuel injection beginning; 44 energisings of electronic control unit (ECU) control electromagnet, armature 47 drive the direction motion of control spool 51 to electromagnet 44 under the electromagnetic force effect of electromagnet 44, the throttle orifice on the throttle valve valve body 56 is opened; High pressure fuel earial drainage in the control chamber 77; Its internal pressure reduces rapidly, and fuel injection needle 64 overcomes needle-valve Returnning spring 58 under the pressure effect of pressure chamber's 67 mesohigh fuel oils spring force promotion control piston 57 upwards lifts commencement of fuel injection.
During end of injection; Electromagnet 44 outage under electronic control unit (ECU) control; Control spool 51 is taken a seat rapidly under the effect of control valve core reseting spring 49, utilizes the throttle orifice on the ball valve closed valve 56 of its front end, in control chamber 77, has rebulid high pressure; Make control piston 57 that the pressure of high pressure fuel is applied to fuel injection needle 64 tops through needle-valve return spring holder 61 once more; Fuel injection needle 64 is taken a seat rapidly under the acting in conjunction of the spring force of control chamber 77 mesohigh fuel pressures and needle-valve Returnning spring 58, and sealing oil sprayer spray orifice stops oil spout.
After end of injection; Electromagnet 9 outage under electronic control unit (ECU) control, control spool 13 to the direction motion of leaving electromagnet 9, are opened the current by pass of fuel oil again under the effect of the spring force of control valve core reseting spring 17; The high pressure fuel earial drainage; Pressure descends rapidly, and orifice valve 22 is closed, and fuel feeding finishes.After getting into the cam profile descending branch, plunger 2 moves downward under the effect of piston spring 5, by 31,32,33 oil suctions of oil inlet and oil return hole, makes to be full of fuel oil in the plunger hole again, for fuel feeding is next time got ready.
Because before fuel injection beginning, fuel oil has the process of a savings pressure in the pressure accumulation chamber 40 of oil sprayer accumulator 39 and in the path of high pressure fuel, make that the fuel oil in this Fuel Injection Control Device can reach higher pressure; Improved fuel pressure on the one hand; Make that when injection beginning with respect to other fuel injection systems, the jet pressure of fuel oil is higher; Injection rate is faster, the oil atomizing better quality; On the other hand, higher fuel pressure makes that the cracking pressure of fuel injection needle 64 is higher, and opening speed is faster.
At after end of injection and since monoblock pump fuel feeding process continue carry out and the pressure accumulation effect in pressure accumulation type oil sprayer pressure accumulation chamber 40, fuel oil still can keep higher pressure.Therefore, when electromagnet 44 outage under electronic control unit (ECU) control, control spool 51 is taken a seat rapidly under the effect of control valve core reseting spring 49, behind the throttle orifice on the sealing throttle valve valve body 56.The fuel pressure that in control chamber 77, has rebulid is also higher; The acting in conjunction of the spring force of this fuel pressure and needle-valve Returnning spring 58; Make that taking a seat of fuel injection needle 64 is rapider; Reached the purpose of rapid oil-break, and, can realize the multi-injection of fuel oil through the powering on once more of electromagnet 44.
Through cooperation control to monoblock pump solenoid valve and pressure accumulation type fuel injector magnetic system; Can get rid of the influence of diesel engine speed to fuel-injection pressure; Pressure surge influences fuel-injected in the inhibition injection process; The pressure accumulation pressure before the control fuel injection and the cracking pressure of fuel injection needle have realized the flexible control to fuel-injection pressure and jet law flexibly.
Claims (3)
1. electronically controlled unit pump and electric-controlled fuel injector bivalve fuel injection apparatus; Comprise electronically controlled unit pump (1), high-pressure oil pipe (37) and electric-controlled fuel injector (41); It is characterized in that: accumulator (39) and solenoid valve (43) are set on the electric-controlled fuel injector (41); The import of accumulator (39) links to each other with electronically controlled unit pump (1) through high-pressure oil pipe (37); The outlet of accumulator (39) links to each other with the oil inlet hole (66) of electric-controlled fuel injector (41), and solenoid valve (43) is installed in above the throttle valve (56) of electric-controlled fuel injector (41), and coupled.
2. electronically controlled unit pump according to claim 1 and electric-controlled fuel injector bivalve fuel injection apparatus is characterized in that: the position of accumulator (39) is on the top of pressure accumulation type electric-controlled fuel injector (41).
3. electronically controlled unit pump according to claim 1 and electric-controlled fuel injector bivalve fuel injection apparatus is characterized in that: the position of accumulator (39) is in the side of pressure accumulation type electric-controlled fuel injector (41).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101173230A CN101806266B (en) | 2010-03-04 | 2010-03-04 | Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector |
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| CN2010101173230A CN101806266B (en) | 2010-03-04 | 2010-03-04 | Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector |
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| CN101806266A CN101806266A (en) | 2010-08-18 |
| CN101806266B true CN101806266B (en) | 2012-07-11 |
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| CN2010101173230A Expired - Fee Related CN101806266B (en) | 2010-03-04 | 2010-03-04 | Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector |
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