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EP0242446B1 - Système de mesure du rapport cyclique d'impulsions de fréquence variable - Google Patents

Système de mesure du rapport cyclique d'impulsions de fréquence variable Download PDF

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Publication number
EP0242446B1
EP0242446B1 EP86117559A EP86117559A EP0242446B1 EP 0242446 B1 EP0242446 B1 EP 0242446B1 EP 86117559 A EP86117559 A EP 86117559A EP 86117559 A EP86117559 A EP 86117559A EP 0242446 B1 EP0242446 B1 EP 0242446B1
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EP
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Prior art keywords
pulses
input
gate
frequency
counter
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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.)
Expired - Lifetime
Application number
EP86117559A
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German (de)
English (en)
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EP0242446A3 (en
EP0242446A2 (fr
Inventor
Bernd Rumpf
Wolfgang Reisch
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.)
Mannesmann VDO AG
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Mannesmann VDO AG
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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
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • 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
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027—Control of the current by pulse width modulation or duty cycle control

Definitions

  • the invention is based on a system for measuring the pulse duty factor of pulses of variable frequency, in particular in electronically controlled fuel injection systems for internal combustion engines.
  • pulse duty factor pulse width / period
  • the period is determined using the first counter, while the pulse width is measured using the second counter.
  • the quotient of the two measurement results is then formed by an arithmetic operation.
  • the object of the invention is to provide a system for measuring the pulse duty factor of pulses of variable frequency, in which a measurement with a required resolution can be carried out with the least possible technical effort within a wide frequency range.
  • the system according to the invention is characterized in that clock pulses are derived, the frequency of which corresponds to a predetermined multiple of the frequency of the pulses (input pulses), and that the pulse duty factor is determined by counting the clock pulses during each pulse.
  • the system according to the invention has the advantage that the pulse duty factor can be measured in a wide frequency range with the same resolution, with counters and other digital circuits being designed only for the number of digits required for the required resolution.
  • the frequency of the clock pulses can be derived by measuring the period of the pulses and forming the reciprocal of the measurement result and multiplying it by a constant that corresponds to the multiple.
  • a second development of the invention consists in that a controllable oscillator, a frequency and phase comparison circuit and a frequency divider are provided for deriving the clock pulses. This enables, for example, the use of commercially available modules, in particular a PLL circuit.
  • clock pulses are fed to a first input and the input pulses to a second input of an AND gate and that a counter is connected to the output of the AND gate.
  • a further embodiment of the invention is characterized in that a D register is connected to the output of the counter, which is clocked with pulses which are derived from the input pulses and fed to the D register via a second OR gate.
  • the D register enables a measured value to be available during the entire period of the pulses to be measured.
  • the pulse duty factor becomes either 0% or 100%.
  • a duty cycle of 0% there are no pulses, but only a DC voltage with a "0" level and with a duty cycle of 100% a DC voltage with a "1" level. In both cases, no period or pulse frequency can be determined.
  • a further development of the invention therefore provides that means are provided for determining whether a pulse duty factor of 100% is present and that a predetermined value is output at a pulse duty factor of 100%.
  • circuits in accordance with the developments mentioned serve to determine a pulse duty factor of 100%, and that at a pulse duty factor of 0%, the counter remains at 0 anyway due to the lack of input pulses.
  • pulse width is determined independently of the pulse frequency and that a duty cycle of 100% is assumed when a limit value is exceeded and that the limit value is derived from the pulse width of a previous pulse.
  • the exemplary embodiment shown in FIG. 1 is supplied with 1 pulses, the pulse duty factor T1 / T of which is to be measured. So that the system can process pulses of both polarities, a switch 2 and a negation stage are provided at input 1.
  • the pulses are first fed to a circuit 4 for measuring the period T. This can be done, for example, by counting pulses with a significantly higher frequency during a period of the input pulses.
  • the output signal of the circuit 4 is then fed to an arithmetic circuit 5, which calculates the frequency of the pulses supplied at 1 by reciprocal value formation and multiplies the value obtained by a constant C.
  • the constant C is supplied from a corresponding memory 6 to the arithmetic circuit 5.
  • the arithmetic circuit 5 At the output of the arithmetic circuit 5 there are pulses whose frequency corresponds to a predetermined multiple of the frequency of the input pulses. The value of the multiple depends on the required resolution of the measurement result.
  • the pulses are fed to an input of a triple AND gate 7.
  • the input pulses processed in a pulse shaper 8 are fed to a further input of the triple AND gate 7.
  • the triple AND gate 7 accordingly causes the clock pulses specified by the circuit 5 to be passed to the n-bit counter 9 only during the occurrence of the input pulses.
  • the counter reading reached after a pulse corresponds to the duty cycle because of the coupling of the frequencies of the clock pulses and the input pulses.
  • the count result V can then be taken from the output of the n-bit counter 9.
  • the n-bit counter 9 is set to 0.
  • a corresponding signal is supplied to the n-bit counter by a control block 10.
  • the control block has further tasks, which are explained below. Particularly in the case of electronically controlled fuel injection systems, it can happen that the input pulses supplied at 1 either become so wide that they become a continuous voltage (duty cycle 100%) or the injection is switched off completely, so that the duty cycle becomes 0. In this case, the circuits 4 and 5 no longer allow the frequency of the input pulses to be determined, so that no corresponding clock pulses can be derived.
  • the circuits 11 and 12 together with the control block 10 already mentioned and a level detector 13 are used to record these operating states.
  • the recording of these operating states takes place in the form of a so-called time-out monitoring in a dynamic manner.
  • the frequency and the width of the input pulses change only relatively slowly because of the inertia of the internal combustion engine, while a change in the pulse width occurs suddenly when a duty cycle of 100% is reached.
  • the pulse width is first measured in a circuit 11.
  • a limit value is formed from this in the circuit 12, which is at most to be expected for the following pulse. This can be done by addition or multiplication.
  • the width of the following pulse is compared with this value.
  • the control block 10 releases via line 14 an input register of the n-bit counter 9 provided for the constant C, whereby the counter reading assumes the value of the constant C.
  • the third input of the triple AND gate 7 is set to a value of 0 by the control block 10 via the line 15, so that the counter remains at the value C.
  • the pulse duty factor of the input pulses remains at 100%, the input signal is continuously compared with the limit value which was determined from the last individual pulse before the transition to the pulse duty factor of 100%. This enables a termination of the 100% duty cycle to be recognized and the subsequent individual pulse to be checked again as described.
  • the level detector 13 In order to achieve a correct result even in the event that the pulse width T1 approaches 0, such a case is determined in the level detector 13.
  • the output of the level detector 13 is connected to an input of the control block, from which, in the absence of pulses via a line 16, the n-bit counter 9 is set to 0 and prevents further counting via the line 15 and the triple AND gate 7 becomes. With the level detector 13 it is additionally achieved that the required starting conditions can be created when the system is switched on.
  • the system shown in FIG. 2 can in turn be used to process pulses of different polarities, for which purpose an input 21 is directly connected and another input 22 is connected via an inverting amplifier 23 and a switch 24. With a frequency divider 25, pulses with half the frequency and with a duty cycle of 50% are generated from the input pulses. These pulses are fed to a PLL circuit 26.
  • the PLL circuit 26 essentially includes a controllable oscillator (VCO) and a frequency and phase comparison circuit.
  • the output voltage of the controllable oscillator is fed via a frequency divider 27 to an input of the frequency and phase comparison circuit and is compared there with the pulses supplied by the frequency divider 25.
  • a voltage, which represents the result of the comparison, is supplied to the control input of the controllable oscillator via an RC element 28, -29.
  • the described control of the controllable oscillator causes the frequency of the oscillator to assume a value which is greater by the division ratio of the circuit 27 than the frequency of the pulses which are supplied to the PLL circuit 26.
  • the ratio n can be entered at 30 depending on the requirements in individual cases.
  • the clock pulses are supplied to the counter 32 via the AND circuit 31.
  • the input pulses are fed to a further input of the AND circuit, so that only those clock pulses which occur within a pulse arrive at the counter.
  • the count of the counter 32 thus represents a measure of the duty cycle.
  • the counter reading is written into a D register 33, which in the exemplary embodiment shown is connected to the counter 32 via 8 lines for 1 bit each.
  • the D register 33 is clocked by the input pulses via an OR circuit 35 and a monostable multivibrator 36. This has the effect that after the counting of the clock pulses the count is transferred to the D register.
  • a delayed reset pulse is generated by the delay circuit 37, which resets the counter to 0 after data has been transferred from the counter 32 to the D register 33.
  • the frequency of the signals which are fed to the PLL circuit 26 reaches the value 0. This can be done by monitoring the output voltage of the frequency and phase comparison circuit of the PLL circuit 26 with the aid of a comparator 38 are found. For this purpose, the control voltage of the controllable oscillator is applied to one input of the comparator, while a comparison voltage is supplied to the other input via a voltage divider 39, 40.
  • the output voltage of the comparator 38 assumes the logic value 0, which is fed to an input of the OR gate 41. If the pulse duty factor is 100%, a 0 is present at the other input of the OR gate 41 via the inverter 43. The 0 present at the output of the OR gate 41 causes the counter to be set to the value which corresponds to a pulse duty factor of 100% via the inverting preset input of the counter.
  • the output voltage of the comparator 38 is also fed to a monostable multivibrator 42, the output signal of which is fed via the OR gate 35 to the clock input of the D register 33.
  • the trailing edge of the output signal of the monostable multivibrator 38 causes the count (100%) to be transferred to the D register 33.
  • the output of the D register 30 forms the output 34 of the system, from which the measurement result Z can be found.
  • a monostable multivibrator 51 generates a pulse of constant width, with which a counter 52 is reset.
  • a signal is fed to the counter 52 as a clock via an input 53 provided for this purpose and via an OR gate 54.
  • the carry output of the counter 52 is connected to a further input of the OR gate 54, so that no further count pulses reach the counter 52 in the event of a carry.
  • the carry signal of the counter 52 is also fed via an inverter 55 to an input of the OR gate 41.
  • a monostable multivibrator 56 is connected to the carry output of the counter 52, the output of which is connected to an input of the OR gate 35.
  • the counter 52 is set to 0 at the beginning of each period T of the input signal supplied at 21 and then counts the clock pulses supplied at 53, the frequency of which is substantially higher than that of the input pulses.
  • the capacity of the counter 52 is now selected such that no carry out takes place within a clock period T of the input pulses. As long as the pulse width T1 has not reached 100%, the counter 52 is set to 0 at the beginning of each clock period T. If, however, 100% duty cycle is reached, the reset is not necessary and after a predetermined number of pulses of the clock signal supplied at 53, a 1 is present at the carry output of the counter 52.
  • the counter is stopped, so that the carry remains at the output until a reset pulse comes from the input 21 via the monostable multivibrator 51.
  • the in Fig. 4 system provided an adaptive determination.
  • both the frequency (corresponding to the engine speed) and the pulse width (duration of the individual injection) do not change suddenly. If a sudden change nevertheless occurs in the pulse width, this allows the conclusion of a transition to a pulse duty factor of 100%.
  • the input pulses in the system according to FIG. 4 are fed to a circuit 61 for measuring the period duration. This can be done in a manner known per se by counting pulses during a period, the frequency of the counting pulses being substantially greater than the frequency of the input pulses.
  • the measured period T is multiplied by a constant stored at 63 or this constant is added to the period.
  • Corresponding signals for selection between multiplication and addition can be supplied at the inputs 64 and 65.
  • a constant adapted to the respective application can be entered via input 66.
  • a value Tmax which corresponds to the period that can be expected as a maximum without a duty cycle of 100% being achieved.
  • This value is delayed at 67 by a period T and compared in a comparator 68 with the period of the following period. If the period T (1) is greater than the maximum period Tmax (0) determined from the previous period, then a 0 is supplied from the comparison circuit 68 to the monostable multivibrator 42 and the OR gate 41, which is already the case in connection with FIG 2 triggers the functions described.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manipulation Of Pulses (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measurement Of Unknown Time Intervals (AREA)

Claims (15)

1. Système de mesure du rapport travail-repos d'impulsions de fréquence variable, en particulier dans le cas des systèmes d'injection de carburant à commande électronique pour moteurs à combustion interne, caractérisé en ce que l'on déduit des impulsions de rythme dont la fréquence correspond à un multiple prescrit de la fréquence des impulsions (impulsions d'entrée); et en ce que l'on détermine le rapport travail-repos par comptage des impulsions de rythme pendant chaque fois une impulsion.
2. Système selon la revendication 1, caractérisé en ce que l'on mesure la durée de la période des impulsions, que l'on forme l'inverse du résultat de la mesure et qu'on le multiplie par une constante correspondant au multiple.
3. Système selon la revendication 1, caractérisé en ce que, pour déduire les impulsions de rythme sont prévus un oscillateur commandé, un circuit de compaison de fréquence et de phase et un diviseur de fréquence.
4. Système selon l'une des revendications 8 et 9, caractérisé en ce que l'on amène les impulsions de rythme à une première entrée et des impulsions d'entrée à une seconde entrée d'une porte ET (7, 31), et en ce qu'un compteur (9, 32) est relié à la sortie de la porte ET (7,31).
5. Système selon la revendication 4, caractérisé en ce que le compteur (9, 32) peut être repositionné à l'origine avec des impulsions qui sont déduites par temporisation des impulsions d'entrée.
6. Système selon la revendication 5, caractérisé en ce que le compteur (9, 32) est positionné à une valeur prescrite par des signaux amenés par l'intermédiaire d'une première porte OU (41).
7. Système selon l'une des revendications 4 à 6, caractérisé en ce qu'à la sortie du compteur (32) est relié un registre D (33), qui reçoit son rythme d'horloge d'impulsions qui sont déduites des impulsions d'entrée et amenées au registre D, par l'intermédiaire d'une seconde porte OU (35).
8. Système selon la revendication 1, caractérisé en ce que des moyens sont prévus pour déterminer si l'on est en présence d'un rapport travail-repos de 100%; et en ce que, dans le cas d'un rapport travail-repos de 100%, on édite une valeur prescrite.
9. Système selon la revendication 7 et 8, caractérisé en ce que les moyens sont reliés à une entrée de la première porte OU (41) et, par l'intermédiaire d'un multivibrateur monostable, à une entrée de la seconde porte OU (35).
10. Système selon la revendication 8, caractérisé en ce que les moyens permettant de déterminer si l'on est en présence d'un rapport travail-repos de 100% comportent un comparateur (38), auquel sont amenées d'une part la tension de sortie d'un circuit (26) de comparaison de fréquence et de phase et d'autre part une tension de comparaison.
11. Système selon la revendication 8, caractérisé en ce que les moyens permettant de déterminer si l'on est en présence d'un rapport travail-repos de 100% comportent un compteur (52), avec une sortie de report, que des impulsions d'entrée peuvent re- positionner à l'origine; en ce que l'entrée de rythme du compteur (52) est reliée à la sortie d'une porte OU (54); en ce que l'une des entrées de la porte OU (54) reçoit des impulsions de comptage; et en ce que l'autre entrée de la porte OU (54) est reliée à la sortie de report.
12. Système selon la revendication 8, caractérisé en ce que l'on détermine la durée d'impulsion indépendamment de la fréquence d'impulsion; et en ce qu'en cas de dépassement d'une valeur limite, on admet un rapport travail-repos de 100%.
13. Système selon la revendication 12, caractérisé en ce que l'on déduit la valeur limite de la durée d'une impulsion précédente.
14. Système selon la revendication 13, caractérisé en ce que cette déduction se fait par addi- tion/soustraction d'une valeur prédéterminée.
15. Système selon la revendication 13, caractérisé en ce que cette déduction se fait par multiplication par une valeur prédéterminée.
EP86117559A 1986-04-07 1986-12-17 Système de mesure du rapport cyclique d'impulsions de fréquence variable Expired - Lifetime EP0242446B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611565 1986-04-07
DE19863611565 DE3611565A1 (de) 1986-04-07 1986-04-07 System zur messung des tastverhaeltnisses von impulsen veraenderlicher frequenz

Publications (3)

Publication Number Publication Date
EP0242446A2 EP0242446A2 (fr) 1987-10-28
EP0242446A3 EP0242446A3 (en) 1988-11-17
EP0242446B1 true EP0242446B1 (fr) 1990-03-07

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ID=6298089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117559A Expired - Lifetime EP0242446B1 (fr) 1986-04-07 1986-12-17 Système de mesure du rapport cyclique d'impulsions de fréquence variable

Country Status (5)

Country Link
US (1) US4841451A (fr)
EP (1) EP0242446B1 (fr)
JP (1) JPS6311870A (fr)
BR (1) BR8701584A (fr)
DE (2) DE3611565A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249132A (en) * 1990-10-31 1993-09-28 Tektronix, Inc. Digital pulse generator
US5367200A (en) * 1993-11-29 1994-11-22 Northern Telecom Limited Method and apparatus for measuring the duty cycle of a digital signal
DE4341797A1 (de) * 1993-12-08 1995-06-14 Bosch Gmbh Robert Verfahren und Vorrichtung zur Ansteuerung eines elektromagnetischen Verbrauchers
US5544065A (en) * 1994-08-09 1996-08-06 Eaton Corporation Apparatus for digitizing ac signals of unknown or changing frequency
DE4429426C2 (de) * 1994-08-19 2002-10-10 Teves Gmbh Alfred Frequenzwandler mit konstantem Übersetzungsverhältnis einer veränderbaren Eingangsfrequenz
US7068191B2 (en) 2001-08-01 2006-06-27 Ebm-Papst St.Georgen Gmbh & Co. Kg Method for determining the numerical value for the duration of a periodically repeated pulse signal, and device for carrying out said method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200063A (en) * 1978-03-20 1980-04-29 General Motors Corporation Engine fuel injection control apparatus with simultaneous pulse width and frequency adjustment
JPS58172452A (ja) * 1982-04-02 1983-10-11 Toyota Motor Corp 電子制御式燃料噴射装置
JPS5915640A (ja) * 1982-07-16 1984-01-26 Diesel Kiki Co Ltd 燃料噴射ポンプ用タイマ装置
US4600994A (en) * 1982-10-06 1986-07-15 Takeda Riken Kogyo Kabushikikaisha Phase difference measuring apparatus

Also Published As

Publication number Publication date
EP0242446A3 (en) 1988-11-17
EP0242446A2 (fr) 1987-10-28
US4841451A (en) 1989-06-20
DE3611565A1 (de) 1987-10-08
JPS6311870A (ja) 1988-01-19
BR8701584A (pt) 1988-01-26
DE3669348D1 (de) 1990-04-12

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