EP1424479A1 - Architektur eines elektronischen Systems zur Bestimmung der Winkelposition einer Motorwelle in Brennkraftmaschines - Google Patents

Architektur eines elektronischen Systems zur Bestimmung der Winkelposition einer Motorwelle in Brennkraftmaschines Download PDF

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Publication number
EP1424479A1
EP1424479A1 EP02425728A EP02425728A EP1424479A1 EP 1424479 A1 EP1424479 A1 EP 1424479A1 EP 02425728 A EP02425728 A EP 02425728A EP 02425728 A EP02425728 A EP 02425728A EP 1424479 A1 EP1424479 A1 EP 1424479A1
Authority
EP
European Patent Office
Prior art keywords
module
indicates
signal
tone wheel
driving shaft
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Withdrawn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
EP02425728A
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English (en)
French (fr)
Inventor
Eusebio Di Cola
Federico Rivoli
Lucio Ticli
Eugenio Cintolo
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.)
STMicroelectronics SRL
Original Assignee
STMicroelectronics SRL
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 STMicroelectronics SRL filed Critical STMicroelectronics SRL
Priority to EP02425728A priority Critical patent/EP1424479A1/de
Priority to US10/722,375 priority patent/US7310574B2/en
Publication of EP1424479A1 publication Critical patent/EP1424479A1/de
Withdrawn legal-status Critical Current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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • 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
    • 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
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1411—Introducing closed-loop corrections characterised by the control or regulation method using a finite or infinite state machine, automaton or state graph for controlling or modelling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/077—Circuits therefor, e.g. pulse generators
    • F02P7/0775—Electronical verniers

Definitions

  • the present invention relates to an architecture of an electronic device architecture for determining the angular position of an engine shaft in internal combustion engines.
  • the invention relates to a device of the above type applied on a direct injection, four-stroke engine with automatic determination of the angular position of the driving shaft and of the operating phase, but the following description refers to this specific field of application for the only purpose of simplifying the explanation.
  • control units - which are also classified as ECU (Electronic Control Unit) - are required to execute increasingly complex and elaborated control functions.
  • ECU control units provided with a co-processor of the TPU (Time Processor Unit) type, specifically intended to be used for processing signals transmitted by a tone wheel sensor of the driving shaft and by a tone wheel sensor of the camshaft, so as to obtain the angular position of the driving shaft as well as the engine operating phase.
  • TPU Time Processor Unit
  • the parameters required for a better actuation of the injection process controlled by the ECU or by the TPU co-processor are several. This implies a large computational load on both the ECU and the TPU co-processor.
  • both units manage a large number of signals having different priority levels. These signals must in any case be managed by software routines started by interrupt signals in the case of ECU, or by the occurrence of certain events in the case of the TCU co-processor.
  • the technical problem at the basis of the present invention is that of devising an electronic device for determining the angular position of a driving shaft in internal combustion engines, which should exhibit such structural and functional features as to allow automatic computing of the driving shaft angular position by directly analysing the signal transmitted by the tone wheel.
  • the solution idea at the basis of the present invention is that of providing a hardware module which may be used as a peripheral device by the ECU in order to reduce its computational load.
  • Such hardware module has the task of executing the calculation of the driving shaft angular position by analysing the signal transmitted by the driving shaft tone wheel sensor.
  • the idea at the basis of the invention is that of releasing the engine electronic control unit (ECU) from the monitoring of the driving shaft angular position in order to relieve its computational load and allow to treate the signal transmitted by a plurality of tone wheels highly widespread in the automotive field, thereby making the control unit easy to be associated to any engine.
  • ECU engine electronic control unit
  • 1 globally and schematically indicates the structure of an electronic device realised according to the present invention for determining the angular position of a driving shaft 3 in internal combustion engines 2, in particular but not exclusively, a direct-injection four-stroke engine with automatic determination of the driving shaft angular position and of the operating phase.
  • Device 1 is associated to an ECU, not shown since it is a conventional one as it is widely used in automotive applications for controlling the ignition and/or injection of these types of engines.
  • Device 1 is schematised in figure 1 by the "Tone wheel manager" block.
  • the main task of the electronic device 1 is that of releasing the electronic control unit from the monitoring of the driving shaft angular position.
  • Device 1 has the task of elaborating electric signals to obtain the angular position of the driving shaft. Such device 1 receives an input signal from a sensor 8 of a tone wheel 7, which is integral in rotation with the driving shaft 3.
  • Tone wheels comprise a predetermined number n of teeth arranged on the circumference of wheel 7 and equidistant from one another. A small group of adjacent teeth m is omitted for defining a point of reference on the wheel.
  • Sensor 8 generates a signal from which device 1 searches the point of reference and emits a signal as the reference is found, and a further signal indicating how many teeth have passed after the point of reference.
  • the teeth counter indicates the position of the driving shaft with an accuracy of (360/n)°.
  • device 1 generates a further signal that indicates the intermediate position between two teeth with a default resolution.
  • the hardware module devised with the present invention receives an input signal from a tone wheel sensor and provides a series of output signals from which it is possible to trace the angular position of the driving shaft given by a known point. It was decided to use as tone wheels those that must be used in the automotive field, practically those having equidistant teeth with the omission of a certain number of adjacent teeth to generate the known point reference. This type of tone wheels generate a digital signal as that shown in Figure 2.
  • Figure 1 shows a layout of the application of the invention.
  • the absence of pulses occurs at the tone wheel holes (absence of teeth).
  • the main task of device 1 "Tone wheel manager” is to detect properly this reference that identifies a particular position of the driving shaft.
  • Device 1 "Tone wheel manager” comprises three modules 4, 5 and 6, also called “decoder_fonica”, “fsm_fonica” and “pend_inter”, respectively, each intended to perform a predetermined function described in detail hereinafter.
  • the entire system 1 is structurally independent and can be realised as integrated circuit and be housed on a standard bus-interconnection and support board. This board may also house the engine ECU.
  • FIG. 3 A general diagram of the hardware architecture of device 1 is shown in Figure 3.
  • the following table 1 reports the input and output I/O signals of device 1. Signals Description Input Control_bus Standard I/O communication interface. Address_bus Data_bus (I/O) The Data bus is bidirectional. fonica_signal Signal generated by the tone wheel sensor circuit. Output n_tooth_holes Total number of teeth and holes lock_f This indicates that the point without teeth in the tone wheel has been found. lock_fon This indicates that the programmed number of revolutions of the driving shaft has been performed from the moment of the activation of the lock signal. tooth_num This indicates the current number of tooth of the tone wheel. This signal allows tracing the angular position of the driving shaft after the activation of the "lock" signal. i_teeth This indicates an intermediate position between two adjacent teeth of the tone wheel with a predetermined accuracy. interruption Interrupt signal.
  • module 4 "decoder_fonica” consists in providing a standard interface toward the ECU, in order to allow the controller embedded into the control unit to manage some registers internal to module 4 "decoder_fonica”.
  • delta This indicates the extent of the interval around the time instant in which the system expects a tone wheel tooth.
  • cfg_filter Enables or disables the digital filter to be appled on the signal transmitted by the tone wheel.
  • cfg_check This indicates whether it is necessary to reset, in case of error, the count of already executed checks.
  • Output to "pend_inter” mask_inter Interrupt mask Input from "fms_fonica” error_at This indicates the number of tooth where the last error occurred.
  • tooth_num This indicates the number of the current tone wheel tooth.
  • i_teeth This indicates an intermediate position between two adjacent teeth of the same tone wheel with a fixed accuracy. frt Free running timer.
  • stato_out This indicates the current status of the state machine of the fsm_fonica".
  • the set of signals lock_f, lock_fon, tooth_num and i_teeth allows to identify at any time the angular position of the driving shaft.
  • the task of the third module 6 "pend_inter” consists of generating an interrupt signal toward the engine ECU once the error signals generated by module 5 "fsm_fonica" have been received in input.
  • this third module 6 "pend_inter” consists of generating an interrupt signal toward the controller of the ECU when a signal indicating the type of error occurred is received in input from module 5 "fsm_fonica”.
  • module 6 generates a signal for module 4 "decoder_fonica” for properly setting the "pending" register, from whose reading the controller of the ECU determines the type of error so as to decide the action to be taken.
  • the emission of the interrupt signal therefore, also sets the related register internal to module 4 "decoder_fonica", from which it is possible to determine the type of error generated by module 5 "fsm_fonica".
  • module 5 "fsm_fonica”.
  • module 5 "fsm_fonica” consists of detecting the driving shaft reference and then providing its position moment by moment. The reference search and the subsequent calculation of the position occur by constantly monitoring the signal transmitted by the tone wheel (fonica_signal) .
  • module 5 "fsm_fonica" waits for the arrival of two teeth in order to determine a first prediction of the time interval where the next tooth should be expected. The search for the point in the tone wheel where m teeth are missing starts at this point. Once such reference has been detected, module 5 emits a corresponding signal and the position of the driving shaft 3 is indicated by a tooth counter that begins counting from the point of reference.
  • the input signals of module 5 "fsm_fonica” are indicated in Table 2 in the section 'Output toward "fsm_fonica”'; moreover, the signal fonica_signal included among the input signals of device 1 in Table 1 should be considered, as well.
  • Output signals are also indicated in Table 2 in section 'Input from "fsm_fonica"'; moreover, the following signals should also be considered: ready, lock_f, lock_fon, included among the output signals of device 1 in Table 1.
  • Figure 4 schematically shows a state machine 10 that describes the functioning of module 5 "fsm_fonica”.
  • the initial status of the state machine 10 is called "idle" and this is the status upon the system start-up and/or after a reset.
  • the state machine 10 By activating the start signal, the state machine 10 passes through the "first_tooth” status (transition T_1), where the first pulse from the tone wheel sensor is expected.
  • the state machine 10 Upon the reception of the first pulse of the fonica_signal signal, the state machine 10 passes through the "second_tooth" status (transition T_2), where a second pulse is expected. During such transition, the current value of the timer is stored to the count1 register, indicating the instant in which the pulse from the fonica_signal signal has been received.
  • the system checks that any subsequent pulse of the fonica_signal signal occurs within a fixed temporal window or that, within such window, no pulse occurs, to pass through the tone wheel point of reference search status.
  • the temporal window is thus determined: the difference (count2-count1) is added to the count 2 value to determine the centre of the interval A when the next pulse is expected; the extremes of the the interval are given by the delta signal, which indicates the number of sub-intervals by which to move from the centre rightwards and leftwards; the extent of the sub-interval is given by the ratio (count2-count1) / n , with fixed n .
  • the whole is schematically shown in Figure 5.
  • the system passes through the "injection” status (transition T_8), where the lock_fon signal is activated as well.
  • the state machine operates in a way similar to the three states of "search_lock”, “maybe_hole”, “check_lock” after detecting the point of reference (activation of the lock_f signal): the check of the proper succession of teeth and their absence is carried out in the same way.
  • the state machine 10 passes through the "stop_state” status (transition T_16); when this signal is interrupted, it passes through the "idle” status (transition T_15).
  • device 1 can be applied on any type of engine provided with tone wheel and is capable of being adapted to the wide variety of tone wheels for driving shafts used in the automotive field.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP02425728A 2002-11-28 2002-11-28 Architektur eines elektronischen Systems zur Bestimmung der Winkelposition einer Motorwelle in Brennkraftmaschines Withdrawn EP1424479A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02425728A EP1424479A1 (de) 2002-11-28 2002-11-28 Architektur eines elektronischen Systems zur Bestimmung der Winkelposition einer Motorwelle in Brennkraftmaschines
US10/722,375 US7310574B2 (en) 2002-11-28 2003-11-25 Electronic architecture of an automatic system for driving an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02425728A EP1424479A1 (de) 2002-11-28 2002-11-28 Architektur eines elektronischen Systems zur Bestimmung der Winkelposition einer Motorwelle in Brennkraftmaschines

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EP1424479A1 true EP1424479A1 (de) 2004-06-02

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2860069A1 (fr) * 2003-09-19 2005-03-25 Siemens Vdo Automotive Procede de detection d'une reference sur un disque dente associe a un dispositif de determination de position angulaire d'une piece tournante
EP1936169A2 (de) * 2006-12-22 2008-06-25 Ifp Verfahren zur Bestimmung der Laufzeit der Zähne einer Welle einer Brennkraftmaschine
EP2341448A1 (de) * 2009-12-29 2011-07-06 Robert Bosch GmbH Elektronische Steuereinheit und Verfahren zur Interpolationsdurchführung in der elektronischen Steuereinheit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100751A1 (de) * 1991-01-12 1992-07-16 Vdo Schindling Porterweiterungsanordnung
US5201296A (en) * 1992-03-30 1993-04-13 Caterpillar Inc. Control system for an internal combustion engine
US5594646A (en) * 1993-12-21 1997-01-14 Aisin Aw Co., Ltd. Method and apparatus for self-diagnosis for an electronic control system for vehicles
US5829412A (en) * 1994-12-15 1998-11-03 Robert Bosch Gmbh System for controlling an internal combustion engine
DE19955513A1 (de) * 1999-11-18 2001-05-23 Bosch Gmbh Robert Konfigurierbare Auswerteschaltung für ein induktiv aufgenommenes Signal
EP1830645A1 (de) 2004-12-23 2007-09-12 Basf Aktiengesellschaft Fungizide mischungen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100751A1 (de) * 1991-01-12 1992-07-16 Vdo Schindling Porterweiterungsanordnung
US5201296A (en) * 1992-03-30 1993-04-13 Caterpillar Inc. Control system for an internal combustion engine
US5594646A (en) * 1993-12-21 1997-01-14 Aisin Aw Co., Ltd. Method and apparatus for self-diagnosis for an electronic control system for vehicles
US5829412A (en) * 1994-12-15 1998-11-03 Robert Bosch Gmbh System for controlling an internal combustion engine
DE19955513A1 (de) * 1999-11-18 2001-05-23 Bosch Gmbh Robert Konfigurierbare Auswerteschaltung für ein induktiv aufgenommenes Signal
EP1830645A1 (de) 2004-12-23 2007-09-12 Basf Aktiengesellschaft Fungizide mischungen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2860069A1 (fr) * 2003-09-19 2005-03-25 Siemens Vdo Automotive Procede de detection d'une reference sur un disque dente associe a un dispositif de determination de position angulaire d'une piece tournante
EP1936169A2 (de) * 2006-12-22 2008-06-25 Ifp Verfahren zur Bestimmung der Laufzeit der Zähne einer Welle einer Brennkraftmaschine
FR2910543A1 (fr) * 2006-12-22 2008-06-27 Inst Francais Du Petrole Methode d'estimation des durees des dents d'une cible moteur
US7543486B2 (en) 2006-12-22 2009-06-09 Ifp Method of estimating the duration of target wheel teeth
EP1936169A3 (de) * 2006-12-22 2010-01-27 Ifp Verfahren zur Bestimmung der Laufzeit der Zähne einer Welle einer Brennkraftmaschine
EP2341448A1 (de) * 2009-12-29 2011-07-06 Robert Bosch GmbH Elektronische Steuereinheit und Verfahren zur Interpolationsdurchführung in der elektronischen Steuereinheit

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