EP0179221A2 - Méthode et dispositif pour déterminer la pression ambiante atmosphérique - Google Patents

Méthode et dispositif pour déterminer la pression ambiante atmosphérique Download PDF

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Publication number
EP0179221A2
EP0179221A2 EP85110408A EP85110408A EP0179221A2 EP 0179221 A2 EP0179221 A2 EP 0179221A2 EP 85110408 A EP85110408 A EP 85110408A EP 85110408 A EP85110408 A EP 85110408A EP 0179221 A2 EP0179221 A2 EP 0179221A2
Authority
EP
European Patent Office
Prior art keywords
diaphragm
pressure
control
linkage
actuator
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.)
Withdrawn
Application number
EP85110408A
Other languages
German (de)
English (en)
Other versions
EP0179221A3 (fr
Inventor
Erasmus Dr. Schulte
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.)
Pierburg GmbH
Robert Bosch GmbH
Original Assignee
Pierburg GmbH
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 Pierburg GmbH, Robert Bosch GmbH filed Critical Pierburg GmbH
Publication of EP0179221A2 publication Critical patent/EP0179221A2/fr
Publication of EP0179221A3 publication Critical patent/EP0179221A3/fr
Withdrawn legal-status Critical Current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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/002—Electric control of rotation speed controlling air supply
    • F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
    • F02D31/004—Electric control of rotation speed controlling air supply for idle speed control by controlling a throttle stop
    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • 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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • F02M7/18—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel-metering orifice
    • F02M7/20—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel-metering orifice operated automatically, e.g. dependent on altitude
    • 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
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/703—Atmospheric pressure
    • F02D2200/704—Estimation of atmospheric pressure

Definitions

  • the invention relates to a method and a device for determining the atmospheric external pressure by means of an electropneumatic diaphragm can actuator, the movable working diaphragm of which, on the one hand, is subjected to a control pressure in a control pressure chamber that can be changed via control valves and, on the other hand, with a force of a diaphragm can spring that is opposed to this in the actuator extension direction and with a movement stop for an external one Controllable linkage, in particular a throttle linkage of an internal combustion engine, is connected to a linkage spring which acts counter to the diaphragm can spring in the actuator insertion direction.
  • electropneumatic diaphragm socket actuators of the type mentioned in the preamble of claim 1 or 7 are used, which act as a position-variable movement stop for an external link, such as a linkage.
  • the present invention has for its object to provide a method and a device of the type mentioned in the preamble of claim 1 and 7, respectively, such that separate pressure sensors are dispensed with and the electropneumatic t for determining the atmospheric external pressure.
  • 1 em brandose actuator can also be used for pressure determination under multiple use.
  • a method of the type mentioned in the preamble of claim 1 is distinguished according to the invention in that, for each measurement process, the external linkage is relieved with closed control valves of the diaphragm socket actuator in operation up to the spring-based contact with the movement stop and then or previously from the movement stop It is completely clear that for these two operating states the strokes of the working diaphragm or the movement stop, or at least one of these strokes, measured from the zero volume of the control pressure chamber, as well as the stroke distance covered between the operating states, are recorded, and that the external pressure is determined from these stroke quantities, taking into account the spring forces .
  • control valves are used to change the control pressure in the control pressure chamber and thus to achieve a position of the movement stop that is in line with requirements.
  • both control valves are closed, so that the stroke sizes that arise in each case in the equilibrium states loaded and unloaded by the linkage of the diaphragm socket actuator. If, for example, an initially loaded operating state is assumed, in which the linkage rests on the movement stop, the lower the atmospheric external pressure, the more it will move in the extension direction when the linkage is relieved. The extension movement is also greater, the greater the output volume of the control pressure chamber when the control valves are closed; it therefore depends on the stroke size available at the time the measuring process begins.
  • the external pressure p a from the strokes S when the linkage is applied or S 2 when the linkage is lifted off and the spring forces K M of the diaphragm can spring or K G of the external linkage and the resulting area F of the working membrane in a first approximation according to the formula be determined.
  • An external pressure determined in this way is sufficiently approximated for practical use; it is assumed here that the spring forces K M , K G remain approximately constant with the spring deflection. If the changes in the spring forces are also to be taken into account in order to arrive at an even more precise result for the external pressure, the formula for the relationship between the pair of values of the stroke sizes and the external pressure can be refined accordingly. Normally, however, the above-mentioned formula is sufficient, since the stroke ranges relevant for the springs in practical use are relatively small anyway.
  • the values for the stroke sizes or the external pressure resulting from a plurality of successive individual measurements are preferably averaged.
  • the influences of tolerances, incorrect measurements and temporary pressure fluctuations can be easily compensated for, so that unwanted, abrupt changes in the pressure display and / or the control interventions based thereon are avoided.
  • a particularly expedient embodiment variant consists in that the stroke sizes of the two operating states are derived from the signals of a position sensor assigned to the membrane box or integrated into it. Accordingly, the position indicator, which is in any case available for control or regulating processes, is also used for determining the stroke sizes to be taken into account, with multiple use.
  • the two operating states for the stroke sizes to be determined can be supplied by the latter ordered operating parameters are recorded.
  • the position of the external linkage (or a signal from a contact switch) can be used to determine whether the linkage is against the movement stop or releases it.
  • the atmospheric external pressure determined during each measurement process is used as an operating control variable, such as for height correction.
  • an operating control variable such as for height correction.
  • the external pressure can only be displayed, for example to make any manual intervention, it is much cheaper to incorporate the determined external pressure into an automatic operating sequence so that the respective pressure conditions are constantly taken into account. This is extremely advantageous, for example, when a motor vehicle operating according to the method according to the invention is operated at constantly changing altitudes.
  • a device for performing the method according to the invention according to the preamble of claim 7 is characterized according to the invention by a measuring element for detecting two stroke sizes of the working diaphragm or the movement stop in the operating states loaded and relieved by the external linkage, by assigning a specific one Pressure size for a pair of values of the two stroke sizes and by an evaluation element for displaying and / or taking into account the pressure size as the operating control variable.
  • a measuring element for detecting two stroke sizes of the working diaphragm or the movement stop in the operating states loaded and relieved by the external linkage, by assigning a specific one Pressure size for a pair of values of the two stroke sizes and by an evaluation element for displaying and / or taking into account the pressure size as the operating control variable.
  • the measuring element is a position feedback sensor integrated in the diaphragm socket actuator.
  • the position indicator is used multiple times so that an additional measuring element can be omitted.
  • the measuring element it is also possible for the measuring element to be a displacement sensor assigned to the movement stop. This can be simple and robust and can work, for example, mechanically, optically or electrically (inductive or ohmic).
  • the assignment is preferably a memory unit with stored values of the stroke size value pairs and the pressure sizes.
  • the pressure values are only read from a stored table in the storage unit, which enables simple and extremely fast access.
  • the assignment it is also possible for the assignment to be an arithmetic unit which determines the external pressure in accordance with a fixed, predetermined relationship with the value pair of the stroke quantities. In both cases, additional factors such as external pressure correction factors can easily be taken into account.
  • the evaluation element is preferably a control device for the control pressure in the control pressure chamber which is assigned to the diaphragm socket actuator and connected to the position indicator.
  • the control device preferably two outputs of the control device can be coupled to the control inputs of two control valves which connect with external pressure and negative pressure.
  • Such a device uses all essential parts of an existing electropneumatic unit several times, on the one hand for nor Male control or regulation processes of the external linkage and on the other hand to determine and simultaneously consider the external pressure.
  • an electro-pneumatic diaphragm actuator 1 has a working pressure chamber 2, which is separated from an externally ventilated outside pressure chamber 3 by a movable working diaphragm 4, which is connected to an end-side movement stop 6 via an outwardly directed diaphragm rod 5 and via one at the Membrane rod 5 attacking Hembrandosenfeder 7 is biased in the actuator extension direction.
  • the control pressure chamber 2 is via an electromagnetic control valve 8 with a valve drive 9 with which also External pressure chamber 3 prevailing external pressure p a and via an electromagnetic control valve 10 with a valve drive 11 with a negative pressure p (such as the intake pressure of an internal combustion engine).
  • the diaphragm socket actuator 1 has a bearing feedback 12 working as a potentiometer, the potentiometer tap of which is mechanically connected to the working membrane 4 and thus slides along a resistance path with voltage supply 27 according to its movement.
  • the signal obtained at the potentiometer tap is thus a measure of the position of the working membrane 4.
  • An external controllable linkage 13, in the present case a throttle linkage, has a pivoting lever 14, the free end of which is pressed by a linkage spring 15 in the direction of contact with the movement stop 6.
  • a control lever 16 articulated to the swivel lever 14 is articulated to an accelerator pedal 17 in such a way that when the accelerator pedal is depressed, the swivel lever 14 is raised from the movement stop 6 against the action of the linkage spring 15.
  • the potentiometer tap of the position indicator 12 is connected via a control line 18 to an input of a control device 19, the outputs 20 and 21 of which are connected to the valve drives 9 and 11.
  • the control unit 19 has further inputs 22 for a load signal, 23 for a speed signal and 24 for a temperature signal.
  • the control line 18 can be provided with a separate assignment element 25 to which an evaluation element 26 is connected. In Fig. 2, this connection option is indicated by a dashed connecting line.
  • the output signal can then be used for display purposes and / or other control purposes.
  • a wiper track of the position indicator 12, which is not described in any more detail, is connected to a voltage source, for example the control unit 19, via supply connections 27.
  • the voltage drop at the potentiometer tap, that is to say on the control line 18, is a measure of the position of the working diaphragm 4, that is to say of the stroke position present in each case.
  • the stroke quantities mentioned can also be taken from the position indicator 12 via the line 18 and fed to the control unit 19 and / or the assignment element 25.
  • the measuring process can also be carried out in reverse, by first depressing the accelerator pedal 17 so that the pivot lever 14 in position A releases the position controller 6, which thus operates when the valves 8, 10 are closed takes the stroke S1 in the equilibrium state.
  • the accelerator pedal 17 is then released, the linkage spring 15 pulls the pivot lever 14 against the movement stop 6, which is thus retracted up to the stroke S 2 .
  • the external pressure is then determined in the same way as before, taking into account the two strokes or at least one of the strokes and the stroke distance.
  • the equation for determining the external pressure p a does not contain the internal or control pressure pi in the control pressure chamber 2, so that the same can be dispensed with and the external pressure can be determined at different control pressures.
  • the relationship arises when the spring forces K M and K G are assumed to be constant and in the various operating states (loading and unloading of the movement stop 6) in the equilibrium state a comparison of forces is carried out taking into account the ideal gas equation. In the case of an even more precise pressure determination, the dependence of the spring forces on the deflection can also be taken into account.
  • the method or the device according to the present invention can achieve a sensitivity of, for example, 100 millibars per% travel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Measuring Fluid Pressure (AREA)
  • Actuator (AREA)
  • Control Of Fluid Pressure (AREA)
EP85110408A 1984-09-22 1985-08-20 Méthode et dispositif pour déterminer la pression ambiante atmosphérique Withdrawn EP0179221A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843434837 DE3434837A1 (de) 1984-09-22 1984-09-22 Verfahren und vorrichtung zum bestimmen des atmosphaerischen aussendrucks
DE3434837 1984-09-22

Publications (2)

Publication Number Publication Date
EP0179221A2 true EP0179221A2 (fr) 1986-04-30
EP0179221A3 EP0179221A3 (fr) 1986-05-21

Family

ID=6246073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110408A Withdrawn EP0179221A3 (fr) 1984-09-22 1985-08-20 Méthode et dispositif pour déterminer la pression ambiante atmosphérique

Country Status (2)

Country Link
EP (1) EP0179221A3 (fr)
DE (1) DE3434837A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008028610A1 (fr) * 2006-09-07 2008-03-13 Wolfgang Suttner Véhicule automobile et accessoire pour ce véhicule

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332268A (en) * 1979-01-16 1982-06-01 Nippondenso Co., Ltd. Atmospheric pressure compensation device
JPS5735139A (en) * 1980-08-07 1982-02-25 Honda Motor Co Ltd Air/fuel ratio feedback control unit for internal combustion engine
DE3235105A1 (de) * 1981-10-28 1983-05-11 Friedmann & Maier AG, 5400 Hallein, Salzburg Ladedruck- bzw. atmosphaerendrucksensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008028610A1 (fr) * 2006-09-07 2008-03-13 Wolfgang Suttner Véhicule automobile et accessoire pour ce véhicule

Also Published As

Publication number Publication date
DE3434837A1 (de) 1986-04-10
EP0179221A3 (fr) 1986-05-21

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Inventor name: SCHULTE, ERASMUS, DR.