EP1460255A2 - Appareil de commande et programme informatique de pilotage du dosage du carburant dans un moteur à combustion interne - Google Patents

Appareil de commande et programme informatique de pilotage du dosage du carburant dans un moteur à combustion interne Download PDF

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Publication number
EP1460255A2
EP1460255A2 EP03023174A EP03023174A EP1460255A2 EP 1460255 A2 EP1460255 A2 EP 1460255A2 EP 03023174 A EP03023174 A EP 03023174A EP 03023174 A EP03023174 A EP 03023174A EP 1460255 A2 EP1460255 A2 EP 1460255A2
Authority
EP
European Patent Office
Prior art keywords
fuel valve
coupling element
control device
combustion engine
internal combustion
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
Application number
EP03023174A
Other languages
German (de)
English (en)
Other versions
EP1460255A3 (fr
EP1460255B1 (fr
Inventor
Uwe Liskow
Michael Huebel
Walter Maeurer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1460255A2 publication Critical patent/EP1460255A2/fr
Publication of EP1460255A3 publication Critical patent/EP1460255A3/fr
Application granted granted Critical
Publication of EP1460255B1 publication Critical patent/EP1460255B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time

Definitions

  • the invention relates to a control device and a computer program for controlling at least one fuel valve with a piezo drive of an internal combustion engine with gasoline direct injection via a coupling element.
  • the needle stroke on the valve seat can be adjusted by means of charge or voltage applied to the piezo element as an actuator.
  • the fuel valve is usually not controlled by a direct connection to the actuator, but by a hydraulic coupling element connected between the actuator and the fuel valve. This serves to compensate for temperature expansions and strains due to pressure forces and wear.
  • this hydraulic coupling element is disadvantageously dependent on the period of the activation, that is to say in particular on the speed of the internal combustion engine, on the activation duration of the Fuel valve (injection duration), the load force of the fuel valve, which depends on the pressure in a fuel accumulator, and the damping constant of the hydraulic coupling element, which not least depends on the temperature of the hydraulic medium used.
  • this compensation ensures according to the invention that the stationary Stroke loss has no negative effects on the accuracy of the control of the fuel valve. Any errors or inaccuracies resulting from the stationary stroke loss are compensated according to the invention by the control device prior to activation.
  • the effects of the stationary stroke loss as an error variable on the stroke of the fuel valve and / or on the injection quantity in the formulas, characteristic curves or characteristic diagrams stored in the control unit for controlling the fuel valve.
  • FIG. 1 shows the arrangement on which the invention is based, of a control device 50, a piezo drive 100 for controlling a fuel valve 300 in accordance with injection commands issued by the control device 50. It can be seen in FIG. 1 that the piezo drive 100 is not directly on the fuel valve 300 acts, but that a hydraulic coupling element 200 is connected between these two components. This hydraulic coupling element is used to compensate for temperature expansions and expansions as a result of compressive forces and to compensate for wear.
  • FIG. 2 shows a detailed view of such a coupling element 200.
  • the coupling element is essentially formed by a piston-cylinder arrangement, the piston having the reference symbol 220 and a cylinder for guiding the piston having the reference symbol 210.
  • the piston 220 is guided in the cylinder 210 filled with a hydraulic fluid 220.
  • Forces set by the piezo drive 100 for setting the fuel valve 300 are first transmitted to the piston 220 and from there via the hydraulic fluid 230 to the guide cylinder 210 before they are forwarded from there to the fuel valve 300.
  • the coupling element 200 is preferably evacuated in its interior.
  • the behavior of the hydraulic coupling element 200 is dependent on numerous influencing factors mentioned above, which lead to a so-called stationary stroke loss occurring during the operation of the coupling element 200.
  • This stationary stroke loss is designated in FIG. 2 by the reference symbol h v.stat . It represents the path error which can occur due to the interposition of the coupling element when the fuel valve 300 is actuated by the piezo drive 100 due to the influences mentioned.
  • the behavior of the coupling element 200 during its operation and the steady stroke loss are generally graphically represented as an error.
  • the black rectangles represented on the lower timeline represent the actuations of the piezo drive 100 by the control device 50 and consequently also the injections E.
  • the spaces between the injections represent the respective actuation pauses or the fillings B.
  • the graphic in FIG. 3 shows that the coupling gap KS, plotted on the ordinate, drops significantly during the control times due to the pressure exerted on the piston 220 by the piezo drive 100, in order then to rise again with an e-function in the subsequent control pauses.
  • This steady stroke loss is shown by the fact that with continued operation of the coupling element, the coupling gap KS is no longer able to fully close itself during the control pauses B of the internal combustion engine regenerate, that is, to grow back to its original value h 0 .
  • This original position h 0 represents a distance of the piston 220 from the bottom surface of the cylinder 210, see FIG. 2.
  • the piston 220 no longer returns to its original distance h 0 from the bottom of the cylinder 210, but instead rather, it only manages to move away from the bottom of the cylinder 210 by a distance of h 0 -h V.stat during the control pause B; when he has reached this position, the drive pause for the internal combustion engine has already ended.
  • the piston 220 is then actuated again by the piezo element 100 to reverse its direction of movement and to approach the bottom of the cylinder 210 again, which results in a rapid shortening of the coupling gap KS.
  • this stationary stroke loss can be taken into account when adjusting the stroke of the fuel valve and / or when adjusting its injection time.
  • the known stationary stroke loss h V.stat of the coupling element 200 used is already stored in the memory element 52 of the control unit Formulas, characteristic curves or characteristic fields for controlling the fuel valve 300 are taken into account.
  • the control of the piezo drive 100 and the fuel valve 300 is preferably carried out in accordance with a computer program stored in the control unit 50.
  • This computer program regularly evaluates the formulas and characteristic curves stored in the storage element 52 for controlling the fuel valve.
  • the computer program is designed such that it takes into account the steady stroke loss when the fuel valve is actuated.
  • the computer program can optionally be stored together with other computer programs for controlling and / or regulating the internal combustion engine 50 on a computer-readable data carrier.
  • the data carrier can be a floppy disk, a compact disc, a flash memory or the like.
  • the program code stored on the data carrier can then be sold to a customer as a product.
  • the computer program possibly together with other computer programs, without the aid of an electronic storage medium, is transmitted and sold as a product to a customer via an electronic communication network, in particular the Internet.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP20030023174 2003-03-21 2003-10-13 Appareil de commande et programme informatique de pilotage du dosage du carburant dans un moteur à combustion interne Expired - Lifetime EP1460255B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003112712 DE10312712A1 (de) 2003-03-21 2003-03-21 Steuergerät und Computerprogramm zum Ansteuern eines Kraftstoffventils einer Brennkraftmaschine
DE10312712 2003-03-21

Publications (3)

Publication Number Publication Date
EP1460255A2 true EP1460255A2 (fr) 2004-09-22
EP1460255A3 EP1460255A3 (fr) 2006-07-19
EP1460255B1 EP1460255B1 (fr) 2009-03-18

Family

ID=32798028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030023174 Expired - Lifetime EP1460255B1 (fr) 2003-03-21 2003-10-13 Appareil de commande et programme informatique de pilotage du dosage du carburant dans un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP1460255B1 (fr)
DE (2) DE10312712A1 (fr)
ES (1) ES2320746T3 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19931233A1 (de) * 1999-07-07 2001-01-18 Siemens Ag Verfahren zum Ansteuern eines kapazitiven Stellgliedes
WO2001023754A1 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Soupape pour commander le passage de liquides
WO2002092985A1 (fr) * 2001-05-14 2002-11-21 Siemens Aktiengesellschaft Procede pour amorcer un actionneur piezoelectrique servant a deplacer un element

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19931233A1 (de) * 1999-07-07 2001-01-18 Siemens Ag Verfahren zum Ansteuern eines kapazitiven Stellgliedes
WO2001023754A1 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Soupape pour commander le passage de liquides
WO2002092985A1 (fr) * 2001-05-14 2002-11-21 Siemens Aktiengesellschaft Procede pour amorcer un actionneur piezoelectrique servant a deplacer un element

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"KRAFTFAHR- TECHNISCHES TASCHENBUCH. Bosch Auflage 21" 1994, , STUTTGART , XP002382135 * Seite 39, Spalte 2 * * Seite 41 * *
SPURK J H ET AL: "Interaction of nonlinear dynamics and unsteady flow in fuel injectors" 1992, SAE TECH PAP SER; SAE TECHNICAL PAPER SERIES 1992 PUBL BY SAE, WARRENDALE, PA, USA, PAGE(S) 1 - 8 , XP002382139 * Seite 2 * *

Also Published As

Publication number Publication date
DE50311306D1 (de) 2009-04-30
DE10312712A1 (de) 2004-09-30
EP1460255A3 (fr) 2006-07-19
ES2320746T3 (es) 2009-05-28
EP1460255B1 (fr) 2009-03-18

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