EP1268999A1 - Verfahren zur bestimmung des raildrucks eines einspritzventils mit einem piezoelektrischen aktor - Google Patents
Verfahren zur bestimmung des raildrucks eines einspritzventils mit einem piezoelektrischen aktorInfo
- Publication number
- EP1268999A1 EP1268999A1 EP01909484A EP01909484A EP1268999A1 EP 1268999 A1 EP1268999 A1 EP 1268999A1 EP 01909484 A EP01909484 A EP 01909484A EP 01909484 A EP01909484 A EP 01909484A EP 1268999 A1 EP1268999 A1 EP 1268999A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- rail pressure
- voltage
- piezoelectric actuator
- injection valve
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 24
- 239000007924 injection Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 239000000446 fuel Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- 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
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
-
- 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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
- F02D2041/223—Diagnosis of fuel pressure sensors
-
- 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
- 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
- F02D2200/0604—Estimation of fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/24—Fuel-injection apparatus with sensors
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
Definitions
- the invention is based on a method for determining the rail pressure of an injection valve with a voltage-controlled piezoelectric actuator according to the preamble of the main claim. It is already known that in an injection valve with a piezoelectric actuator, the movement of the nozzle needle is not controlled directly, but via a hydraulic coupler. One of the tasks of the coupler is to increase the stroke of a control valve. For correct functioning, however, the hydraulic coupler must be completely filled, especially since part of the liquid is pressed out of the hydraulic coupler through leakage gaps each time the piezoelectric actuator is activated. The refill takes place during the pause between two injections. In order to release a predetermined amount of liquid in the high pressure channel, it is necessary that the pressure in the high pressure channel is known.
- This pressure is usually measured with a corresponding sensor, which is attached at a suitable point in the high-pressure line system (common rail system).
- the problem can arise that a faulty rail pressure measurement occurs if the pressure sensor fails. Due to the incorrect rail pressure measurement is then no longer guaranteed that the specified injection quantity is actually released. This can be particularly critical in a motor vehicle with an internal combustion engine if the intended amount of fuel is not injected. This can lead to abrupt malfunctions and possibly to a standstill of the internal combustion engine. On the other hand, undesirable large injection quantities can also occur.
- the method according to the invention for determining the rail pressure of an injection valve with a voltage-controlled piezoelectric actuator has the advantage over the other hand that the pressure in the high-pressure channel of the injection valve is additionally measured by measuring the induced piezo voltage. This results in a redundant pressure measurement with which the measured value of the pressure sensor can be monitored.
- the correct functioning of the pressure sensor can be monitored in a simple manner by comparing the calculated rail pressure with the measured value of the pressure sensor. For example, if the pressure sensor falls through a line break or If the error occurs, the redundant measured value can be used for an emergency operation to maintain the function of the internal combustion engine.
- Figure 1 shows a schematic representation of a
- FIG. 2 shows an assignment diagram
- FIG. 3 shows a voltage diagram
- Figure 4 shows a block diagram
- Figure 1 shows a schematic representation
- Injector 1 with a central bore.
- a piezoelectric actuator 2 is introduced, on the lower end of which an actuating piston 3 is attached.
- the actuating piston 3 closes off at the top a hydraulic coupler 4, one at the bottom
- the closing member 12 is designed such that it closes the first seat 6 when the actuator 2 is in the idle phase, ie when no drive voltage U a was applied to it.
- the actuator 2 When the actuator 2 is actuated by applying the control voltage U a to the terminals +, - the actuator 2 actuates the actuating piston 3 and, via the hydraulic coupler 4, presses the control valve 5 with the closing member 12 in the direction of a second seat 7.
- a nozzle needle 11 is arranged in a corresponding channel, which closes or opens the outlet for a high-pressure channel 13, for example a common rail system, depending on the control voltage U a and the pressure P ] _ im
- High pressure area is present.
- the high pressure is supplied through the medium to be injected, for example fuel for an internal combustion engine, via an inlet 9.
- the inflow amount of the medium in the direction of the nozzle needle 11 and the hydraulic coupler 4 is controlled via an inlet throttle 8 and an outlet throttle 10.
- the hydraulic coupler 4 has the task on the one hand to increase the stroke of the piston 5 and on the other hand to decouple the control valve 5 from the static temperature expansion of the actuator 2.
- the dimensioning of the hydraulic coupler 4 is designed such that it is refilled with a pressure derived from the rail pressure, specifically when the closing member 12 is located on the first seat 6. This can be achieved, for example, as a constant gear ratio. If this transmission ratio is 1:10, for example, then the pressure in the hydraulic coupler 4 is only 1/10 of the rail pressure.
- the amount of fuel to be injected must be determined as a function of the engine conditions and driving conditions of the vehicle.
- the injection quantity must be determined as precisely as possible each time the nozzle needle 11 is actuated in order to achieve optimum combustion in the cylinder of the internal combustion engine with regard to exhaust gas requirements, consumption values and performance spectrum. Therefore, the current pressure is usually measured with a pressure sensor, which is arranged at a suitable point in the high-pressure system of the common rail lines, and a corresponding one Control unit provided as a measured value. Since this pressure sensor has to work very reliably, a further pressure measurement is carried out according to the invention, which is redundant to the measurement of the pressure sensor.
- This second pressure measurement takes place via the piezo voltage induced in the piezoelectric actuator 2, which is generated by the pressure in the hydraulic coupler 4 and can be measured on the actuator 2. Due to the fact that the coupler pressure is a function of the rail pressure when completely filled, the current rail pressure can be deduced from the induced voltage.
- This induced voltage U j _ serves as a further (redundant) measurement signal for the pressure prevailing in the high-pressure duct 13.
- the control unit now receives two measured values for the pressure measurement, by means of which the measurement signal of the pressure sensor can be monitored. On the other hand, if the pressure sensor fails, the induced voltage U- ⁇ can be used to ensure emergency operation of the internal combustion engine.
- FIG. 2 shows an assignment diagram in which the Y-
- Axis is the voltage Uj_ induced in the actuator 2 and the pressure P ⁇ measured by the pressure sensor D for the high-pressure line system is plotted on the X axis.
- the curve U j _ f (P ] _) shows the relationship between the two quantities mentioned.
- a straight line equation is shown
- a is the slope as a proportionality factor and b is an off-value.
- This curve can be used as an algorithm as an alternative to a table, which was preferably determined empirically.
- FIG. 3 shows a section of a typical voltage diagram, in which the voltage at the actuator terminals +, - applied voltage ⁇ J 1 m as a function of time.
- the coupler 4 is filled to the point in time t1 and the measured voltage corresponds to the voltage Ui induced by the coupler pressure.
- control takes place, in which the actuator is initially charged and completely discharged again at a later time.
- the coupler 4 is also emptied accordingly. Due to the coupler pressure, however, a voltage Ui is now indicated. This increases with a certain gradient, since in this time period the coupler 4 is refilled until it has reached its target filling, i. H. until the static coupler pressure builds up
- FIG. 4 shows a block diagram for forming the pressure value from the piezo voltage U -, _, measured at time t1.
- the conversion algorithm is stored in a conversion 40.
- the output signal for the pressure P ] _ then serves to check the plausibility of the measured rail pressure or as a substitute value for the rail pressure in the event of an error.
Landscapes
- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10014737 | 2000-03-24 | ||
DE10014737A DE10014737A1 (de) | 2000-03-24 | 2000-03-24 | Verfahren zur Bestimmung des Raildrucks eines Einspritzventils mit einem piezoelektrischen Aktor |
PCT/DE2001/000175 WO2001073282A1 (de) | 2000-03-24 | 2001-01-17 | Verfahren zur bestimmung des raildrucks eines einspritzventils mit einem piezoelektrischen aktor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1268999A1 true EP1268999A1 (de) | 2003-01-02 |
EP1268999B1 EP1268999B1 (de) | 2005-11-02 |
Family
ID=7636246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01909484A Expired - Lifetime EP1268999B1 (de) | 2000-03-24 | 2001-01-17 | Verfahren zur bestimmung des raildrucks eines einspritzventils mit einem piezoelektrischen aktor |
Country Status (6)
Country | Link |
---|---|
US (1) | US6712047B2 (de) |
EP (1) | EP1268999B1 (de) |
JP (1) | JP2003529017A (de) |
CN (1) | CN1227455C (de) |
DE (2) | DE10014737A1 (de) |
WO (1) | WO2001073282A1 (de) |
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DE10157641C2 (de) | 2001-11-24 | 2003-09-25 | Mtu Friedrichshafen Gmbh | Verfahren zur Steuerung einer Brennkraftmaschine |
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DE19732802A1 (de) * | 1997-07-30 | 1999-02-04 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19733560B4 (de) * | 1997-08-02 | 2007-04-05 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Laden und Entladen eines piezoelektrischen Elements |
JP2000027725A (ja) * | 1998-07-08 | 2000-01-25 | Isuzu Motors Ltd | コモンレール式燃料噴射装置 |
GB9823028D0 (en) * | 1998-10-22 | 1998-12-16 | Lucas Ind Plc | Fuel injector |
DE19901711A1 (de) * | 1999-01-18 | 2000-07-20 | Bosch Gmbh Robert | Brennstoffeinspritzventil und Verfahren zum Betreiben eines Brennstoffeinspritzventils |
-
2000
- 2000-03-24 DE DE10014737A patent/DE10014737A1/de not_active Withdrawn
-
2001
- 2001-01-17 DE DE50107907T patent/DE50107907D1/de not_active Expired - Lifetime
- 2001-01-17 US US10/239,585 patent/US6712047B2/en not_active Expired - Fee Related
- 2001-01-17 CN CNB018070833A patent/CN1227455C/zh not_active Expired - Fee Related
- 2001-01-17 EP EP01909484A patent/EP1268999B1/de not_active Expired - Lifetime
- 2001-01-17 WO PCT/DE2001/000175 patent/WO2001073282A1/de active IP Right Grant
- 2001-01-17 JP JP2001570978A patent/JP2003529017A/ja active Pending
Non-Patent Citations (1)
Title |
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See references of WO0173282A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001073282A1 (de) | 2001-10-04 |
DE10014737A1 (de) | 2001-10-11 |
CN1419630A (zh) | 2003-05-21 |
US6712047B2 (en) | 2004-03-30 |
CN1227455C (zh) | 2005-11-16 |
DE50107907D1 (de) | 2005-12-08 |
JP2003529017A (ja) | 2003-09-30 |
EP1268999B1 (de) | 2005-11-02 |
US20030154806A1 (en) | 2003-08-21 |
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