EP0694686A1 - Méthode et moyen pour le traitement de paramètres d'un véhicule pour la commande de systèmes et unités fonctionnelles du véhicule - Google Patents

Méthode et moyen pour le traitement de paramètres d'un véhicule pour la commande de systèmes et unités fonctionnelles du véhicule Download PDF

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Publication number
EP0694686A1
EP0694686A1 EP95111276A EP95111276A EP0694686A1 EP 0694686 A1 EP0694686 A1 EP 0694686A1 EP 95111276 A EP95111276 A EP 95111276A EP 95111276 A EP95111276 A EP 95111276A EP 0694686 A1 EP0694686 A1 EP 0694686A1
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EP
European Patent Office
Prior art keywords
value
cell
stored
index
signal
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Withdrawn
Application number
EP95111276A
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German (de)
English (en)
Inventor
Massimiliano Nanni
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli SpA
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Filing date
Publication date
Application filed by Magneti Marelli SpA filed Critical Magneti Marelli SpA
Publication of EP0694686A1 publication Critical patent/EP0694686A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2409—Addressing techniques specially adapted therefor

Definitions

  • This invention relates to a method of processing vehicle data for the control of systems and functional units mounted on a vehicle.
  • This invention also relates to means implementing the above-mentioned method.
  • Systems of the above-mentioned type currently used in vehicles have a plurality of sensors which detect the above-mentioned vehicle, system and functional unit parameters, and a central electronic unit which processes the incoming signals to control the operating systems and functional units.
  • the central unit comprises an analog-digital converter which converts the analog signals received from the sensors into digital signals, and a memory block in which a table defined by a vector of values defined and ordered in increasing order is present for every parameter found. Substantially every table has a plurality of numbered cells, each of which stores a value which is greater than the value stored in the immediately preceding cell. Whenever a signal is received from a sensor, the central unit, after converting it, checks which cell in the table stores the value closest to the converted signal.
  • This check consists of comparing the converted signal with the stored value, starting from the first cell, until the cell storing the value closest to the value of the converted signal is identified. Once this cell has been identified, the central unit uses two parameters, called “index” and “ratio" to process the data, where by index is meant the value of the cell number and by ratio is meant a value calculated on the basis of the value of the converted signal, the value stored in the cell identified and the value stored in the cell immediately preceding the cell identified.
  • the main disadvantage of the method described above lies in the long times which are required in order to identify the cell storing the value closest to the value for the converted signal. It should be remembered in fact that whenever a signal is received the comparison between the value of the signal and the values stored in the table must always be made starting from the first cell. It is obvious that, if in the limit the value stored in the table closest to the signal value is to be found in the last cell, then in order to identify this cell it is necessary to make as many comparisons as there are cells. Long times for identification of the correct cell require long times for sending control signals to operating systems and functional units. It will be understood therefore that the control signal arrives late, i.e. when, after changes in driving conditions, the operating systems and functional units require a different control signal.
  • the object of this invention is to provide a method for processing vehicle parameters for the control of systems and functional units mounted on vehicles which is faster than existing methods.
  • a further object of this invention is to provide means implementing the above-mentioned method.
  • a method of processing vehicle parameters for the control of systems and functional units mounted on a vehicle characterised in that it comprises: detecting, through sensors, the above-mentioned vehicle parameters, such as the value of the fuel pressure, the value of the temperature of the air drawn along the air intake manifold, the value of the temperature of the fluid in a cooling circuit, the angular position of a butterfly valve installed in the inlet manifold, the speed of the vehicle, the existence of knock in the vehicle's engine, the value of the electrical voltage of the vehicle's battery, the stoichiometric composition of the vehicle's exhaust gases, and others, converting, using a converter, the analog signals received from the said sensors into digital signals, comparing the value of the said digital signal with a value stored in a cell in a table which has a plurality of said cells, each of which stores a corresponding value, each table representing a vector of a plurality of stored values defined and ordered in increasing order according to a serial index, adopting, as the starting
  • means for processing vehicle parameters for the control of systems and functional units mounted on a vehicle comprising: a plurality of sensors capable of detecting the aforesaid vehicle parameters such as the value of the fuel pressure, the value of the temperature of the air drawn along an inlet manifold, the value of the temperature of the fluid in a cooling circuit, the angular position of a butterfly valve installed in the air intake manifold, the speed of the vehicle, the existence of knock in the vehicle's engine, the value of the electrical voltage of the vehicle's battery, the stoichiometric composition of the vehicle's exhaust gases, and others, a converter capable of converting the analog signals detected by the said sensors into digital signals, a central data processing unit, a memory block having a plurality of tables, one for each parameter detected by the said sensors, which has a plurality of cells, each of which stores a corresponding value, each table representing a vector for a plurality of stored values defined and ordered in increasing order in accordance with a serial index
  • 1 indicates as a whole a system for the processing of vehicle parameters for the control of systems and functional units mounted on a vehicle.
  • System 1 comprises: an electronic central unit 2, a plurality of sensors 3 capable of detecting the aforesaid vehicle parameters such as the value of the fuel pressure, the value of the temperature of the air drawn along the intake manifold, the value of the temperature of the fluid in a cooling circuit, the angular position of a butterfly valve installed in the air intake manifold, the speed of the vehicle, the existence of knock in the vehicle's engine, the value of the electrical voltage of the vehicle's battery, the stoichiometric composition of the vehicle's exhaust gases, and others, and a plurality of systems and functional units 4 such as e.g.
  • an electronic ignition system an electronic injection system, the actuator unit for idling conditions, the fuel circulating pump, the engine cooling system, the passenger space air conditioning system, the system for enabling warning light signals, the anti-theft system, the drive device for the butterfly valve mounted in the air intake system, the system performing diagnoses on the said systems and functional units listed above, and valves and other functional units within the passenger space or in the engine compartment which are or are not dedicated to the vehicle's engine.
  • Central unit 2 comprises: an analog-digital converter 5 capable of converting the analog signals detected from sensors 3 into digital signals, a central data processing unit 6, a memory block 7, a block 8 controlling electronic ignition system 4, a block 11 controlling electronic injection system 4, and a block 12 controlling other operating systems and functional units 4.
  • memory block 7 comprises a plurality of tables 13, one for each parameter detected by sensors 3.
  • Each table 13 is defined by a plurality of cells 14 each of which stores a corresponding value K.
  • Each table 13 represents a vector for a plurality of vectors K defined and ordered in increasing order in accordance with a serial index I. Substantially every table 13 has a plurality of numbered cells 14 each of which stores a value K which is greater than the value K stored in the immediately preceding cell 14.
  • Each table 13 is associated with a cell 15 which stores the index Ip relating to the index of cell 14 in which the value K closest to the value H of the signal received has been identified in the previous cycle.
  • 100 indicates as a whole an operational scheme for system 1 used whenever a signal is received from one of sensors 3.
  • each sensor 3 is associated with an operating system 100.
  • a starting block 101 leads to a block 102 in which a check is made to see whether the index Ip stored in cell 15 is smaller than or equal to the index In relating to the maximum number of the cells 14 in table 13. If this is the case block 102 leads to a block 103, while if it is not the case block 102 leads to a block 104.
  • the index Ip is taken as the index I
  • block 104 the index In is taken as the index I.
  • Blocks 103 and 104 lead to a block 105 in which a check is made to see whether the value H of the signal is less than or equal to the value K(I), i.e. the value K stored in cell 14 which has the serial index I. If this is the case block 105 leads to a block 106, while if it is not the case block 105 leads to a block 107. In block 106 a check is made to see whether index I is equal to 1. If this is the case block 106 leads to a block 108, while if it is not the case block 106 leads to a block 111. In block 108 a parameter R called ratio is taken to have a value of zero. Block 108 then leads to an output block 112.
  • index I and ratio R are used as processing data, where by index I is meant the numerical position of cell 14 storing the value K closest to the value H for the signal.
  • the comparison which is performed in blocks 105, 111 and 116 consists of checking the difference between the values H and K for each parameter.
  • the method according to this invention comprises: detecting the said vehicle parameters using sensors 3, converting the analog signals detected by sensors 3 into digital signals using converter 5, comparing the value H of the digital signal with a value K stored in a cell 14 which is adopted as a starting cell 14 in which the first comparison is made, starting cell 14 corresponding to the index Ip identified in the immediately preceding functional cycle and stored in cell 15, adopting the index Ip of starting cell 14 as the new index I where value H is close to value K stored in that starting cell 14; comparing value H with the value K stored in cell 14 immediately preceding starting cell 14 if value H is less than value K stored in starting cell 14, and so on, so as to decrease index I until cell 14 storing value K closest to value H is identified, comparing value H with value K stored in cell 14 immediately following starting cell 14, if value H is greater than value K stored in starting cell 14, and so on, so as to increase index I until cell 14 storing value K closest to value H is identified, storing the index I in identified cell 14 in cell 15 as the new index Ip, calculating ratio
  • the main advantage of the method according to this invention comprises adopting not first cell 14 in table 13, but the cell identified in the previous cycle, as starting cell 14.
  • a greater speed of identification of cell 14 makes it possible to send control signals to the operating systems and functional units at a faster speed and as a consequence these operating systems and functional units follow changes imposed upon them by the control signals more promptly and effectively. Substantially an overall improvement is achieved in both function and performance in all operating systems and functional units mounted on the vehicle.
EP95111276A 1994-07-19 1995-07-18 Méthode et moyen pour le traitement de paramètres d'un véhicule pour la commande de systèmes et unités fonctionnelles du véhicule Withdrawn EP0694686A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO940339 1994-07-19
ITBO940339A IT1274843B (it) 1994-07-19 1994-07-19 Metodo ed impianto di elaborazione di parametri motoristici per la gestione di sistemi ed organi installati in un veicolo.

Publications (1)

Publication Number Publication Date
EP0694686A1 true EP0694686A1 (fr) 1996-01-31

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ID=11339943

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Application Number Title Priority Date Filing Date
EP95111276A Withdrawn EP0694686A1 (fr) 1994-07-19 1995-07-18 Méthode et moyen pour le traitement de paramètres d'un véhicule pour la commande de systèmes et unités fonctionnelles du véhicule

Country Status (3)

Country Link
EP (1) EP0694686A1 (fr)
BR (1) BR9502344A (fr)
IT (1) IT1274843B (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2046950A (en) * 1979-04-02 1980-11-19 Honda Motor Co Ltd Engine controlling system
US4987544A (en) * 1988-09-19 1991-01-22 Honda Giken Kogyo Kabushiki Kaisha Engine control device for reducing the processing time of control variables
EP0445329A1 (fr) * 1990-03-07 1991-09-11 Siemens Aktiengesellschaft Installation de commande d'un moteur à combustion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2046950A (en) * 1979-04-02 1980-11-19 Honda Motor Co Ltd Engine controlling system
US4987544A (en) * 1988-09-19 1991-01-22 Honda Giken Kogyo Kabushiki Kaisha Engine control device for reducing the processing time of control variables
EP0445329A1 (fr) * 1990-03-07 1991-09-11 Siemens Aktiengesellschaft Installation de commande d'un moteur à combustion

Also Published As

Publication number Publication date
IT1274843B (it) 1997-07-25
ITBO940339A1 (it) 1996-01-19
ITBO940339A0 (it) 1994-07-19
BR9502344A (pt) 1996-04-23

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