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WO1994008130A1 - Procede pour la regulation du reglage en continu de l'ecart angulaire entre les cames - Google Patents

Procede pour la regulation du reglage en continu de l'ecart angulaire entre les cames Download PDF

Info

Publication number
WO1994008130A1
WO1994008130A1 PCT/DE1993/000908 DE9300908W WO9408130A1 WO 1994008130 A1 WO1994008130 A1 WO 1994008130A1 DE 9300908 W DE9300908 W DE 9300908W WO 9408130 A1 WO9408130 A1 WO 9408130A1
Authority
WO
WIPO (PCT)
Prior art keywords
determined
spread
setpoint
actuator
cam
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.)
Ceased
Application number
PCT/DE1993/000908
Other languages
German (de)
English (en)
Inventor
Manfred Wier
Axel Daase
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO1994008130A1 publication Critical patent/WO1994008130A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2201/00—Electronic control systems; Apparatus or methods therefor
    • 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
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus

Definitions

  • the invention relates to a method for regulating the stepless cam spread in an internal combustion engine by means of an actuator.
  • a measure of the shift is the so-called ⁇ ock spread, which is the time period between the top dead center when the charge changes and the greatest valve lift of the intake valve.
  • DE-OS 40 06 950 assumes a variable cam spread in order to carry out the adjustment of the camshaft in a stepless manner.
  • This so-called Vano ⁇ principle (variable cam spread) enables an individual setting of the cam spread depending on the load and speed.
  • the method known from DE-OS 40 06 950 provides a comparison of the crankshaft position with the camshaft position, the comparison taking place in speed-dependent sampling times.
  • the comparison value is supplied in digital form to the input of a difference former.
  • the setpoint of the cam spread is read from a spread map and a second input of a Differential generator supplied.
  • the output signal of the differential generator is fed to a digital control element, the control parameters of which are adapted as a function of the speed and are converted via a D / A converter into an analog control signal which is fed, for example, to a solenoid valve to influence the cam spread.
  • An essential feature of the invention is that, among other things, the direction of the adjustment required is determined. Depending on whether the setpoint is greater than the actual value or vice versa, the adjustment direction can be determined by evaluating a resulting negative or positive amount.
  • the sampling is carried out in a fixed time grid.
  • an actuator for example a solenoid valve, is actuated with a variable pulse duty factor, as a result of which the adjustment speed is influenced.
  • the actuator is controlled with the variable duty cycle until, in the ideal case, the setpoint is equal to the actual value.
  • the setpoint is taken from at least one map.
  • characteristic diagrams are provided, which are stored in a computer as pre-control tables, in which the setpoint of the cam spread is determined as a function of various, operation-dependent input variables.
  • various characteristic maps can be provided for the operating state "Katffyen", where the engine speed, the intake air mass, the cooling water temperature and the dead time can be taken into account. After completion of the operating state "Katsammlungen” other maps are provided, where the engine speed, the intake air mass and the cooling water temperature can be taken into account.
  • the setpoint of the cam spread is determined from all these characteristic maps, so that, depending on the direction of adjustment, a specific duty cycle is determined by which the rate of adjustment of the cam spread is influenced.
  • the adjustment speed of the cam spread in the early or late direction can thus also be determined, the adjustment speed in the early direction being slower than in the late direction.
  • the actuator If the deviation of the target value from the actual value is within a predetermined tolerance, for example 1%, it is expedient to control the actuator with a neutral duty cycle. Through the control With a neutral duty cycle, the adjustment of the actuator is ended and thus also the regulation. This has the advantage that a permanent load on the computer is avoided, so that possible oscillating vibrations cannot occur.
  • a predetermined tolerance for example 1%
  • a great control quality can be achieved by the invention, since the time behavior of the control loop can be optimally adjusted by the variable duty cycle.
  • different control qualities can be used, i.e. Either asymptotic approximations to the actual value or overshoots with damped decay are possible depending on the technical requirements.
  • the best setpoint of the cam spread can be determined depending on the operating state of the engine.
  • the engine operating states “acceleration” and “overrun mode" that is to say the so-called transient state, can be treated separately by the choice of the duty cycle.
  • Fig. 1 is a flowchart of a control for the variable cam spread
  • a Vanos unit (VE) is controlled via a computer (not shown), so that the routine arrives at a decision unit ATB, where it is determined whether the scanning conditions are met. Are these not fulfilled when, for example, the engine is at a standstill, a start is being initiated or if an error is detected in the angular pulse generator (sensor), the routine returns to the starting point.
  • the routine arrives at the target-actual unit, where the target value is compared with the actual value. If no discrepancy is found, the routine returns to the starting point. If, on the other hand, a discrepancy is ascertained, the routine arrives at a unit MV in which an actuator is controlled in a fixed time pattern with a variable pulse duty factor until the setpoint is reached. The routine then arrives at a counter Z, through which the routine is reset to the decision unit for the scanning conditions.
  • crankshaft angle is shown as a function of time.
  • the setpoint is represented by a bold curve, while the actual value is represented by a thin curve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

Pour le réglage en continu de l'écart angulaire entre les cames dans un moteur à combustion interne, la position instantanée de l'arbre à cames (valeur réelle) est déterminée par un détecteur. Ensuite, la valeur réelle est déterminée sur la base d'une courbe caractéristique enregistrée dans un ordinateur, ainsi que la direction du réglage requis. Selon l'importance de l'écart relevé, un organe de réglage est alors actionné avec un rapport d'impulsions variable, la détection étant effectuée dans une tranche de temps fixe. L'organe de réglage est ensuite actionné pendant une durée déterminée avec une valeur neutre pour l'analyse de la position actuelle de l'arbre à cames, puis la détermination de l'écart recommence dès le début.
PCT/DE1993/000908 1992-09-30 1993-09-24 Procede pour la regulation du reglage en continu de l'ecart angulaire entre les cames Ceased WO1994008130A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924232836 DE4232836C1 (de) 1992-09-30 1992-09-30 Verfahren zur Regelung der stufenlosen Verstellung der Nockenspreizung
DEP4232836.5 1992-09-30

Publications (1)

Publication Number Publication Date
WO1994008130A1 true WO1994008130A1 (fr) 1994-04-14

Family

ID=6469267

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1993/000908 Ceased WO1994008130A1 (fr) 1992-09-30 1993-09-24 Procede pour la regulation du reglage en continu de l'ecart angulaire entre les cames

Country Status (2)

Country Link
DE (1) DE4232836C1 (fr)
WO (1) WO1994008130A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722187A1 (de) * 1997-05-27 1998-12-03 Bayerische Motoren Werke Ag Verfahren zur Steuerung einer verstellbaren Nockenspreizung bei einer Brennkraftmaschine in Kraftfahrzeugen
US5937806A (en) * 1998-03-13 1999-08-17 General Motors Corporation Closed-loop camshaft phaser control
US7237516B2 (en) 2000-03-02 2007-07-03 Siemens Aktiengesellshaft Method for controlling an actuator, using a retaining mark space ratio
DE10101678A1 (de) * 2001-01-16 2002-07-18 Volkswagen Ag Verfahren und Vorrichtung zum Regeln einer Regelstrecke sowie Brennkraftmaschine mit einem solchen Regler
JP4075811B2 (ja) * 2004-01-14 2008-04-16 トヨタ自動車株式会社 内燃機関の可変動弁機構故障診断装置
JP4678350B2 (ja) 2006-08-31 2011-04-27 トヨタ自動車株式会社 可変バルブタイミング装置
FR3107083B1 (fr) * 2020-02-06 2022-01-07 Renault Sas Procédé de contrôle d’un angle de décalage d’un arbre à cames

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112494A1 (fr) * 1982-12-24 1984-07-04 Robert Bosch Gmbh Dispositif de commande de soupapes pour un moteur à combustion interne à l'aide d'un arbre à cames
US4909194A (en) * 1989-07-20 1990-03-20 Siemens-Bendix Automotive Electronics L.P. Modular position controller for variable valve timing
US4928640A (en) * 1989-07-20 1990-05-29 Siemens-Bendix Automotive Electronics L.P. Autocalibration of camshaft phasing feedback in a variable valve timing system
EP0445555A2 (fr) * 1990-03-06 1991-09-11 Bayerische Motoren Werke Aktiengesellschaft Procédé de régulation continue de phase d'arbre à cames en fonction du régime

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112494A1 (fr) * 1982-12-24 1984-07-04 Robert Bosch Gmbh Dispositif de commande de soupapes pour un moteur à combustion interne à l'aide d'un arbre à cames
US4909194A (en) * 1989-07-20 1990-03-20 Siemens-Bendix Automotive Electronics L.P. Modular position controller for variable valve timing
US4928640A (en) * 1989-07-20 1990-05-29 Siemens-Bendix Automotive Electronics L.P. Autocalibration of camshaft phasing feedback in a variable valve timing system
EP0445555A2 (fr) * 1990-03-06 1991-09-11 Bayerische Motoren Werke Aktiengesellschaft Procédé de régulation continue de phase d'arbre à cames en fonction du régime

Also Published As

Publication number Publication date
DE4232836C1 (de) 1993-09-30

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