EP0440942B1 - Method for the disposal of electric information values - Google Patents

Method for the disposal of electric information values Download PDF

Info

Publication number
EP0440942B1
EP0440942B1 EP90124339A EP90124339A EP0440942B1 EP 0440942 B1 EP0440942 B1 EP 0440942B1 EP 90124339 A EP90124339 A EP 90124339A EP 90124339 A EP90124339 A EP 90124339A EP 0440942 B1 EP0440942 B1 EP 0440942B1
Authority
EP
European Patent Office
Prior art keywords
information
pulse
item
consumption
speed
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.)
Expired - Lifetime
Application number
EP90124339A
Other languages
German (de)
French (fr)
Other versions
EP0440942A2 (en
EP0440942A3 (en
Inventor
Dirk Dipl.-Ing. Mentgen
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.)
Robert Bosch GmbH
Original Assignee
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0440942A2 publication Critical patent/EP0440942A2/en
Publication of EP0440942A3 publication Critical patent/EP0440942A3/en
Application granted granted Critical
Publication of EP0440942B1 publication Critical patent/EP0440942B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/22—Electric signal transmission systems in which transmission is by pulses by varying the duration of individual pulses

Definitions

  • the invention relates to a method for providing a plurality of information about the operating state of an internal combustion engine, in particular an internal combustion engine provided with a control unit, the generation of first information, in particular a duty cycle, and at least one further, second, in particular pulse-shaped, periodic information, and the information can be combined in a single electrical combination signal.
  • Corresponding electrical signals must be transmitted for the display and / or processing of information about the current operating point of an internal combustion engine. If the internal combustion engine has a control unit, this gives, for example, consumption and speed information via electrical Cables provided to the receiving location.
  • This can be, for example, a dashboard that has a fuel consumption display and a tachometer. For the provision or transmission of two pieces of information, such as consumption and speed, two lines with the associated plug contacts of the plug device are required.
  • a pulse generator for an electronic fuel consumption measuring device of which at least two operating values, namely the pulse repetition frequency and the height of the pulses or the pulse repetition frequency and the width (duration) of the pulses or the height and the width of the pulses can be changed as a function of the electrical measured quantities (information).
  • the repetition frequency of the pulse generator and, depending on the pressure in the intake system the width of each pulse delivered by the pulse generator should be changed.
  • the pulse sequence containing two pieces of information can thus be transmitted via an electrical line.
  • one piece of information fails or its value becomes "zero”
  • the other information is also omitted, because pulses of "zero" width have no repetition frequency or the frequency "zero” leads to pulse width "zero” or “infinite”.
  • the inventive method with the features mentioned in the main claim has the Advantage that only one line and one plug contact are required for the provision and transmission of two pieces of information, but the absence of one of the two pieces of information does not lead to the information content of the other piece of information being lost.
  • the information of the different signals is combined in a single combination signal by adding the pulse widths assigned to the information per combination signal period. If the first information disappears, for example, for a short time, the pulse width of the combination signal is reduced by the amount of the failed information only during this downtime.
  • the first information is preferably assigned to an electrical signal, the information content of which is determined by a pulse duty factor. So it is a pulse train.
  • a further, second piece of information is preferably in the form of a pulse-shaped, periodic, second electrical signal, the information being in the frequency of the second signal.
  • the first information is preferably consumption information, the pulse duty factor of which depends on the size of the fuel consumption of the internal combustion engine.
  • the second information is speed information of the internal combustion engine.
  • crankshaft-synchronous signals is preferably the output signal of an engine control unit.
  • the consumption information is superimposed with a speed information that extends its pulse duration.
  • the consumption information is a pulse sequence with the corresponding duty cycle.
  • the speed information is now superimposed in such a way that the pulse duration of the consumption information increases; thus a change in the duty cycle occurs.
  • the combination signal is generated.
  • the pulse duration of the consumption information is increased by a constant time.
  • the method according to the invention has the advantage that even if a fuel cut-off takes place in the overrun mode of the internal combustion engine, that is to say there is no fuel consumption during the duration of the coasting operation, speed information is nevertheless transmitted.
  • the speed information as a speed signal on one line and the consumption information as a consumption signal on another line transmitted
  • the consumption signal can therefore not be used as a speed signal at the same time, although in the normal operation of the internal combustion engine there are synchronous pulse train sequences since the consumption information disappears during overrun operation and therefore no speed information would be available.
  • the overlay according to the invention by increasing the pulse duration of the consumption information makes it possible to make do with a single signal, namely the combination signal.
  • a periodic needle pulse signal can be used as speed information.
  • the consumption information is superimposed on the needle pulse signal, whereby the pulse duration of the consumption information increases only insignificantly, so that the consumption information is hardly falsified. If the error that occurs in the consumption display is negligible, the subtraction of the speed signal from the combination signal to be performed at the receiving location can be omitted.
  • information from an engine control unit is output via a suitable plug connection which is connected to a number of electrical lines corresponding to the number of information items.
  • a first piece of information having a duty cycle and a second, pulse-shaped, periodic piece of information are considered here, the first piece of information being consumption information TVB and the second piece of information being speed information TD.
  • the duty cycle -related to a period ts- of the consumption information TVB corresponds to the current fuel consumption of an internal combustion engine of a vehicle.
  • the consumption information is transmitted from the engine control unit to the dashboard (fuel consumption display) via the line connection already mentioned.
  • the second information relates to the speed n of the internal combustion engine. This is also indicated by a tachometer on the dashboard and must therefore be transmitted from the engine control unit via a line.
  • BM is assigned to the crankshaft of the internal combustion engine Reference mark marked. It has a period of 360 ° cube wave angle.
  • an ignition signal Zdg is shown, which is used to control the ignition output stage of the internal combustion engine. Then follows the speed information TD already described with the period ts. It can be seen that the pulse sequence of the ignition signal Zdg runs synchronously with the pulse sequence of the speed information TD.
  • the speed information TD in FIG. 1 — shows the consumption information TVB, which likewise runs synchronously with the ignition signal Zdg or with the speed information TD. It therefore consists of a periodic pulse train.
  • the pulse width t KVA represents - based on the period t - a duty cycle that corresponds to the fuel consumption of the internal combustion engine. The larger the pulse width t KVA , the greater the fuel consumption.
  • overrun mode Sch no fuel is consumed in modern internal combustion engines; one speaks here of "overrun cutoff". The result of this is that no consumption information TVB occurs during the period of overrun operation.
  • the speed information TD is retained despite the loss of the consumption information TVB. Therefore, for the transmission of the consumption and the Speed information two lines with corresponding plug contacts etc. required.
  • the speed n is: where Zylza is equal to the number of cylinders of the internal combustion engine.
  • the consumption VB results from the consumption signal TVB from the following relationship: where KD denotes a flow constant. For example, this is
  • FIG. 2 shows an arrangement of the prior art
  • FIG. 2 shows an arrangement of the prior art
  • the method according to the invention illustrates.
  • the upper waveform again shows the reference mark BM, which has a period of 360 °.
  • An ignition signal Zdg is shown below the reference mark BM.
  • the combination signal TD / VB according to the invention is shown underneath. It contains two pieces of information, namely first piece of information, which represents consumption information TVB, and second piece of information, namely speed information TD.
  • the combination signal has the period ts and has a pulse width t KVB . Within each period ts, the consumption information TVB is overlaid with the speed information TD by adding the pulse widths of the respective information.
  • the pulse width t KVB thus contains the consumption information TVB specified as the duty cycle and the period duration ts contains the speed information TD, which is formed by corresponding pulse-shaped signals. If there is a fuel cut-off in which there is no fuel consumption and accordingly the consumption information TVB is omitted, the combination signal TD / VB and thus the speed information are retained. This is marked with Sch in FIG. 2. Accordingly, there is only the second, namely the speed information TD.
  • the pulse duration of the second information associated with the speed is constant.
  • the speed n can be determined according to the relationship:
  • the pulse width t KVB of the combination signal TD / VB does not fall below a certain time, for example, is always greater than 1 ms, that is: t KVB ⁇ 1ms
  • the difference between the period ts and the pulse duration t KVB does not fall below a certain time, for example, is also always greater than 1 ms, that is: ts - t KVB ⁇ 1ms.
  • the consumption can be determined from the following relationship: where KDB is a flow constant.
  • t KVB The relationship between t KVB and t KVA is thus: where ts min is the period at maximum engine speed and t KVA max is the pulse width at maximum fuel consumption.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Description

Die Erfindung betrifft ein verfahren zur Bereitstellung von mehreren Informationen über den Betriebszustand einer Brennkraftmaschine, insbesondere einer mit Steuergerät versehenen Brennkraftmaschine, wobei die Erzeugung einer ersten, insbesondere ein Tastverhältnis aufweisenden Information und mindestens einer weiteren, zweiten, insbesondere impulsförmigen, periodischen Information erfolgt und die Informationen in einem einzigen, elektrischen Kombinationssignal vereinigt werden.The invention relates to a method for providing a plurality of information about the operating state of an internal combustion engine, in particular an internal combustion engine provided with a control unit, the generation of first information, in particular a duty cycle, and at least one further, second, in particular pulse-shaped, periodic information, and the information can be combined in a single electrical combination signal.

Für die Anzeige und/oder Verarbeitung von Informationen über den momentanen Betriebspunkt einer Brennkraftmaschine sind entsprechende elektrische Signale zu übertragen. Weist die Brennkraftmaschine ein Steuergerät auf, so gibt dieses z.B. Verbrauchs- und Drehzahlinformationen über mit elektrischer Steckvorrichtung versehene Leitungen zum Empfangsort. Dieser kann z.B. ein Armaturenbrett sein, das eine Kraftstoffverbrauchsanzeige sowie einen Drehzahlmesser aufweist. Für die Bereitstellung bzw. Übertragung zweier Informationen, wie Verbrauch und Drehzahl, sind zwei Leitungen mit den dazugehörigen Steckkontakten der Steckvorrichtung erforderlich.Corresponding electrical signals must be transmitted for the display and / or processing of information about the current operating point of an internal combustion engine. If the internal combustion engine has a control unit, this gives, for example, consumption and speed information via electrical Cables provided to the receiving location. This can be, for example, a dashboard that has a fuel consumption display and a tachometer. For the provision or transmission of two pieces of information, such as consumption and speed, two lines with the associated plug contacts of the plug device are required.

Aus der DE-OS 20 34 067 ist bekannt, für ein elektronisches Kraftstoffverbrauchs-Meßgerät einen Impulsgeber zu verwenden, von dem mindestens zwei Betriebswerte, nämlich die Impulsfolgefrequenz und die Höhe der Impulse oder die Impulsfolgefrequenz und die Breite (Dauer) der Impulse oder die Höhe und die Breite der Impulse in Abhängigkeit von den elektrischen Meßgrößen (Informationen) verändert werden. Insbesondere soll in Abhängigkeit der Motordrehzahl die Folgefrequenz des Impulsgebers und in Abhängigkeit vom Druck im Ansaugsystem die Breite jedes vom Impulsgeber gelieferten Impulses verändert werden. Die zwei Informationen beinhaltende Impulsfolge kann somit über eine elektrische Leitung übertragen werden. Fällt jedoch eine Information aus oder wird ihr Wert "Null", so entfällt auch die andere Information, denn Impulse der Breite "Null" besitzen keine Folgefrequenz bzw. die Frequenz "Null" führt zur Impulsbreite "Null" oder "Unendlich".From DE-OS 20 34 067 it is known to use a pulse generator for an electronic fuel consumption measuring device, of which at least two operating values, namely the pulse repetition frequency and the height of the pulses or the pulse repetition frequency and the width (duration) of the pulses or the height and the width of the pulses can be changed as a function of the electrical measured quantities (information). In particular, depending on the engine speed, the repetition frequency of the pulse generator and, depending on the pressure in the intake system, the width of each pulse delivered by the pulse generator should be changed. The pulse sequence containing two pieces of information can thus be transmitted via an electrical line. However, if one piece of information fails or its value becomes "zero", the other information is also omitted, because pulses of "zero" width have no repetition frequency or the frequency "zero" leads to pulse width "zero" or "infinite".

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren mit den im Hauptanspruch genannten Merkmalen hat demgegenüber den Vorteil, daß für die Bereitstellung und Übertragung zweier Informationen ebenso lediglich eine Leitung sowie ein Steckkontakt erforderlich ist, wobei jedoch das Ausbleiben einer der beiden Informationen nicht dazu führt, daß der Informationsinhalt der anderen Information verlorengeht. Die Informationen der verschiedenen Signale werden in einem einzigen Kombinationssignal vereinigt, indem die den Informationen zugeordneten Impulsbreiten je Kombinationssignal-Periode addiert werden. Fällt die erste Information z.B. kurzzeitig weg, so verringert sich lediglich in dieser Ausfallzeit die Impulsbreite des Kombinationssignal um den Betrag der ausgefallenen Information. Die erste Information ist vorzugsweise einem elektrischen Signal zugeordnet, dessen Informationsinhalt durch ein Tastverhältnis bestimmt wird. Es handelt sich also um eine Impulsfolge. Eine weitere, zweite Information, liegt vorzugsweise in Form eines impulsförmigen, periodischen, zweiten elektrischen Signals vor, wobei die Information in der Frequenz des zweiten Signals steckt.The inventive method with the features mentioned in the main claim has the Advantage that only one line and one plug contact are required for the provision and transmission of two pieces of information, but the absence of one of the two pieces of information does not lead to the information content of the other piece of information being lost. The information of the different signals is combined in a single combination signal by adding the pulse widths assigned to the information per combination signal period. If the first information disappears, for example, for a short time, the pulse width of the combination signal is reduced by the amount of the failed information only during this downtime. The first information is preferably assigned to an electrical signal, the information content of which is determined by a pulse duty factor. So it is a pulse train. A further, second piece of information is preferably in the form of a pulse-shaped, periodic, second electrical signal, the information being in the frequency of the second signal.

Vorzugsweise ist die erste Information eine Verbrauchsinformation, deren Tastverhältnis von der Größe des Kraftstoffverbrauchs der Brennkraftmaschine abhängt. Die zweite Information ist eine Drehzahlinformation der Brennkraftmaschine. Mithin erfordert eine Kraftstoffverbrauchs- und eine Drehzahlanzeige am Armaturenbrett eines Kraftfahrzeugs nur eine zum Steuergerät der Brennkraftmaschine führende Leitungsverbindung.The first information is preferably consumption information, the pulse duty factor of which depends on the size of the fuel consumption of the internal combustion engine. The second information is speed information of the internal combustion engine. A fuel consumption and speed display on the dashboard of a motor vehicle therefore requires only one line connection leading to the control unit of the internal combustion engine.

Die Erfindung ist nicht auf die Verbrauchsinformation beschränkt, sondern kann auch mit anderen, insbesondere kurbelwellensynchronen Signalen realisiert werden. Vorzugsweise ist dieses kurbelwellensynchrone Signal das Ausgangssignal eines Motorsteuergeräts.The invention is not limited to the consumption information, but can also be implemented with other signals, in particular crankshaft-synchronous signals. This crankshaft-synchronous signal is preferably the output signal of an engine control unit.

Erfindungsgemäß ist vorgesehen, daß der Verbrauchsinformation eine deren Impulsdauer verlängernde Drehzahlinformation überlagert wird. Bei der Verbrauchsinformation handelt es sich -wie bereits erwähnt- um eine Impulsfolge mit dem Verbrauch entsprechendem Tastverhältnis. Die Drehzahlinformation wird nun derart überlagert, daß sich die Impulsdauer der Verbrauchsinformation vergrößert; mithin eine Veränderung des Tastverhältnis' eintritt. Es entsteht das Kombinationssignal. Insbesondere wird die Impulsdauer der Verbrauchsinformation um eine konstante Zeitdauer vergrößert. Zur Bestimmung des Verbrauchs ist es am Empfangsort erforderlich, von dem Kombinationssignal diese konstante Zeitdauer zum Erhalt des ursprünglichen Tastverhältis' wieder abzuziehen. Einerseits liegt dann das den Verbrauch bestimmende Tastverhältnis und andererseits die die Drehzahl bestimmende Frequenz vor. Die erfindungsgemäße Methode hat den Vorteil, daß selbst dann, wenn eine Schubabschaltung im Schubbetrieb der Brennkraftmaschine erfolgt, also kein Kraftstoffverbrauch während der Dauer des Schubbetriebs vorliegt, dennoch eine Drehzahlinformation übertragen wird. Im Stand der Technik, bei dem auf einer Leitung die Drehzahlinformation als Drehzahlsignal und auf einer anderen Leitung die Verbrauchsinformation als Verbrauchssignal übertragen werden, kann daher das Verbrauchssignal nicht gleichzeitig als Drehzahlsignal herangezogen werden, obwohl -im Normalbetrieb der Brennkraftmaschine- kurbelwellensynchrone Impulsfolgen vorliegen, da während des Schubbetriebs die Verbrauchsinformation fortfällt und somit auch keine Drehzahlinformation mehr zur Verfügung stehen würde. Durch die erfindungsgemäße Überlagerung durch Vergrößern der Impulsdauer der Verbrauchsinformation wird es möglich, mit einem einzigen Signal, nämlich dem Kombinationssignal, auszukommen.According to the invention, it is provided that the consumption information is superimposed with a speed information that extends its pulse duration. As already mentioned, the consumption information is a pulse sequence with the corresponding duty cycle. The speed information is now superimposed in such a way that the pulse duration of the consumption information increases; thus a change in the duty cycle occurs. The combination signal is generated. In particular, the pulse duration of the consumption information is increased by a constant time. To determine the consumption, it is necessary at the receiving location to subtract this constant time period from the combination signal in order to maintain the original duty cycle. On the one hand, there is the duty cycle that determines the consumption and, on the other hand, the frequency that determines the speed. The method according to the invention has the advantage that even if a fuel cut-off takes place in the overrun mode of the internal combustion engine, that is to say there is no fuel consumption during the duration of the coasting operation, speed information is nevertheless transmitted. In the prior art, in which the speed information as a speed signal on one line and the consumption information as a consumption signal on another line transmitted, the consumption signal can therefore not be used as a speed signal at the same time, although in the normal operation of the internal combustion engine there are synchronous pulse train sequences since the consumption information disappears during overrun operation and therefore no speed information would be available. The overlay according to the invention by increasing the pulse duration of the consumption information makes it possible to make do with a single signal, namely the combination signal.

Nach einer Ausführungsform kann als Drehzahlinformation ein periodisches Nadelimpulssignal verwendet werden. Mithin wird der Verbrauchsinformation das Nadelimpulssignal überlagert, wodurch sich die Impulsdauer der Verbrauchsinformation nur unwesentlich vergrößert, so daß die Verbrauchsinformation so gut wie nicht verfälscht wird. Ist der auftretende Fehler der Verbrauchsanzeige vernachlässigbar, so kann die am Empfangsort vorzunehmende Subtraktion des Drehzahlsignals vom Kombinationssignal entfallen.According to one embodiment, a periodic needle pulse signal can be used as speed information. Thus, the consumption information is superimposed on the needle pulse signal, whereby the pulse duration of the consumption information increases only insignificantly, so that the consumption information is hardly falsified. If the error that occurs in the consumption display is negligible, the subtraction of the speed signal from the combination signal to be performed at the receiving location can be omitted.

Zeichnungdrawing

Die Erfindung wird im folgenden anhand der Figuren näher erläutert. Es zeigen:

Figur 1
ein Impulsdiagramm, daß die bisherige Informationsübertragung auf mehreren Leitungen darstellt und
Figur 2
ein erfindungsgemäßes Impulsdiagramm, daß zur Informationsübertragung ein Kombinationssignal verwendet, welches lediglich eine Leitung benötigt.
The invention is explained in more detail below with reference to the figures. Show it:
Figure 1
a timing diagram that represents the previous information transmission on several lines and
Figure 2
an inventive pulse diagram that uses a combination signal for information transmission, which only requires one line.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Kraftfahrzeugelektronik erfolgt die Ausgabe von Informationen eines Motorsteuergeräts über eine geeignete Steckverbindung, die an eine der Zahl der Informationen entsprechende Anzahl von elektrischen Leitungen angeschlossen ist. Es sei hier eine erste, ein Tastverhältnis aufweisende Information und eine zweite, impulsförmige, periodische Information betrachtet, wobei die erste Information eine Verbrauchsinformation TVB und die zweite Information eine Drehzahlinformation TD ist. Das Tastverhältnis -bezogen auf eine Periodendauer ts- der Verbrauchsinformation TVB entspricht dem momentanen Kraftstoffverbrauch einer Brennkraftmaschine eines Fahrzeugs. Die Verbrauchsinformation wird von dem Motorsteuergerät über die bereits angesprochene Leitungsverbindung zum Armaturenbrett (Kraftstoffverbrauchsanzeige) übertragen wird. Die zweite Information bezieht sich auf die Drehzahl n der Brennkraftmaschine. Auch diese wird von einem Drehzahlmesser des Armaturenbretts angezeigt und muß daher vom Motorsteuergerät über eine Leitung übertragen werden.In motor vehicle electronics, information from an engine control unit is output via a suitable plug connection which is connected to a number of electrical lines corresponding to the number of information items. A first piece of information having a duty cycle and a second, pulse-shaped, periodic piece of information are considered here, the first piece of information being consumption information TVB and the second piece of information being speed information TD. The duty cycle -related to a period ts- of the consumption information TVB corresponds to the current fuel consumption of an internal combustion engine of a vehicle. The consumption information is transmitted from the engine control unit to the dashboard (fuel consumption display) via the line connection already mentioned. The second information relates to the speed n of the internal combustion engine. This is also indicated by a tachometer on the dashboard and must therefore be transmitted from the engine control unit via a line.

Dieser bekannte Aufbau ist in der Figur 1 mit Hilfe von Signalverläufen verdeutlicht. Mit BM ist eine der Kurbelwelle der Brennkraftmaschine zugeordnete Bezugsmarke gekennzeichnet. Sie weist eine Periode von 360° Kubelwellenwinkel auf.This known structure is illustrated in FIG. 1 with the aid of signal profiles. BM is assigned to the crankshaft of the internal combustion engine Reference mark marked. It has a period of 360 ° cube wave angle.

Darunter ist ein Zündsignal Zdg dargestellt, das der Ansteuerung der Zündendstufe der Brennkraftmaschine dient. Es folgt dann die bereits beschriebene Drehzahlinformation TD mit der Periodendauer ts. Es ist erkennbar, daß die Impulsfolge des Zündsignals Zdg synchron zur Impulsfolge der Drehzahlinformation TD verläuft.Below this, an ignition signal Zdg is shown, which is used to control the ignition output stage of the internal combustion engine. Then follows the speed information TD already described with the period ts. It can be seen that the pulse sequence of the ignition signal Zdg runs synchronously with the pulse sequence of the speed information TD.

Unter der Drehzahlinformation TD ist -in Figur 1-die Verbrauchsinformation TVB wiedergegeben, die ebenfalls synchron zum Zündsignal Zdg bzw. zur Drehzahlinformation TD verläuft. Sie besteht daher aus einer periodischen Impulsfolge. Die Impulsbreite tKVA stellt -bezogen auf die Periodendauer ts- ein Tastverhältnis dar, daß dem Kraftstoffverbrauch der Brennkraftmaschine entspricht. Je größer also die Impulsbreite tKVA, desto größer ist der Kraftstoffverbrauch. Allerdings besteht hinsichtlich der Synchronität der Verbrauchsinformation TVB zur Drehzahlinformation TD eine Ausnahme. Dies ist in der Figur 1 durch gestrichelte Linien gekennzeichnet. Im Schubbetrieb Sch wird bei modernen Brennkraftmaschinen kein Kraftstoff verbraucht; man spricht hier von "Schubabschaltung". Dies hat zur Folge, daß für die Zeit des Schubbetriebs keine Verbrauchsinformation TVB auftritt. Da die Brennkraftmaschine im Schubbetrieb jedoch -je nach Betriebspunkt- eine entsprechende Drehzahl n aufweist, bleibt die Drehzahlinformation TD trotz Wegfall der Verbrauchsinformation TVB erhalten. Mithin sind für die Übertragung der Verbrauchs- und der Drehzahlinformation zwei Leitungen mit entsprechenden Steckkontakten usw. erforderlich. Nach dem bekannten Verfahren gemäß Figur 1 ergibt sich die Drehzahl n zu:

Figure imgb0001

wobei Zylza gleich der Anzahl der Zylinder der Brennkraftmaschine ist.The speed information TD — in FIG. 1 — shows the consumption information TVB, which likewise runs synchronously with the ignition signal Zdg or with the speed information TD. It therefore consists of a periodic pulse train. The pulse width t KVA represents - based on the period t - a duty cycle that corresponds to the fuel consumption of the internal combustion engine. The larger the pulse width t KVA , the greater the fuel consumption. However, there is an exception with regard to the synchronicity of the consumption information TVB with the speed information TD. This is indicated in FIG. 1 by dashed lines. In overrun mode Sch, no fuel is consumed in modern internal combustion engines; one speaks here of "overrun cutoff". The result of this is that no consumption information TVB occurs during the period of overrun operation. However, since the internal combustion engine has a corresponding speed n in overrun mode, depending on the operating point, the speed information TD is retained despite the loss of the consumption information TVB. Therefore, for the transmission of the consumption and the Speed information two lines with corresponding plug contacts etc. required. According to the known method according to FIG. 1, the speed n is:
Figure imgb0001
where Zylza is equal to the number of cylinders of the internal combustion engine.

Der Verbrauch VB ergibt sich aus dem Verbrauchssignal TVB aus folgender Beziehung:

Figure imgb0002

wobei KD eine Durchflußkonstante bezeichnet. Diese beträgt zum Beispiel
Figure imgb0003
 The consumption VB results from the consumption signal TVB from the following relationship:
Figure imgb0002
where KD denotes a flow constant. For example, this is
Figure imgb0003

Im Gegensatz zu Figur 1, die eine Anordnung des Standes der Technik zeigt, wird in der Figur 2 das erfindungsgemäße Verfahren verdeutlicht. Der obere Signalverlauf zeigt wiederum die Bezugsmarke BM, die eine Periode von 360° aufweist. Unterhalb der Bezugsmarke BM ist ein Zündsignal Zdg dargestellt. Darunterliegend ist das erfindungsgemäße Kombinationssignal TD/VB wiedergegeben. Es beinhaltet zwei Informationen und zwar eine erste Information, die eine Verbrauchsinformation TVB darstellt, sowie eine zweite Information, nämlich eine Drehzahlinformation TD. Das Kombinationssignal weist die Periodendauer ts auf und besitzt eine Impulsbreite tKVB. Innerhalb jeder Periodendauer ts erfolgt eine Überlagerung der Verbrauchsinformation TVB mit der Drehzahlinformation TD, indem die Impulsbreiten der jeweiligen Informationen addiert werden. In der Impulsbreite tKVB ist somit die als Tastverhältnis vorgegebene Verbrauchsinformation TVB und in der Periodendauer ts die Drehzahlinformation TD enthalten, die von entsprechenden impulsförmigen Signalen gebildet wird. Sofern also eine Schubabschaltung erfolgt, bei der kein Kraftstoffverbrauch vorliegt und demgemäß die Verbrauchsinformation TVB entfällt, bleibt dennoch das Kombinationssignal TD/VB und damit die Drehzahlinformation erhalten. Dieses ist in der Figur 2 mit Sch gekennzeichnet. Dort liegt demgemäß lediglich die zweite, nämlich die Drehzahlinformation TD vor.In contrast to Figure 1, which shows an arrangement of the prior art, in Figure 2 that The method according to the invention illustrates. The upper waveform again shows the reference mark BM, which has a period of 360 °. An ignition signal Zdg is shown below the reference mark BM. The combination signal TD / VB according to the invention is shown underneath. It contains two pieces of information, namely first piece of information, which represents consumption information TVB, and second piece of information, namely speed information TD. The combination signal has the period ts and has a pulse width t KVB . Within each period ts, the consumption information TVB is overlaid with the speed information TD by adding the pulse widths of the respective information. The pulse width t KVB thus contains the consumption information TVB specified as the duty cycle and the period duration ts contains the speed information TD, which is formed by corresponding pulse-shaped signals. If there is a fuel cut-off in which there is no fuel consumption and accordingly the consumption information TVB is omitted, the combination signal TD / VB and thus the speed information are retained. This is marked with Sch in FIG. 2. Accordingly, there is only the second, namely the speed information TD.

Sofern man also aus dem Kombinationssignal TD/VB die Verbrauchsinformation erhalten möchte, ist es lediglich erforderlich, die Impulsbreite der Drehzahlinformation TD vom Kombinationssignal TD/VB abzuziehen.If one wishes to obtain the consumption information from the combination signal TD / VB, it is only necessary to subtract the pulse width of the speed information TD from the combination signal TD / VB.

Insbesondere ist die Impulsdauer der der Drehzahl zugeordneten zweiten Information konstant.In particular, the pulse duration of the second information associated with the speed is constant.

Die Drehzahl n läßt sich bestimmen nach der Beziehung:

Figure imgb0004
The speed n can be determined according to the relationship:
Figure imgb0004

Für die Funktion eines Drehzahlmessers ist es meist notwendig, daß die Impulsbreite tKVB des Kombinationssignals TD/VB eine gewisse Zeit nicht unterschreitet, beispielsweise immer größer 1ms ist, also:

t KVB ≧ 1ms

Figure imgb0005


Ebenso ist es für die Funktion des Drehzahlmessers meist notwendig, daß die Differenz von Periodendauer ts und Impulsdauer tKVB eine gewisse Zeit nicht unterschreitet, beispielsweise ebenfalls immer größer 1ms ist, also:

ts - t KVB ≧ 1ms.
Figure imgb0006
For the function of a tachometer, it is usually necessary that the pulse width t KVB of the combination signal TD / VB does not fall below a certain time, for example, is always greater than 1 ms, that is:

t KVB ≧ 1ms
Figure imgb0005

Likewise, for the function of the tachometer, it is usually necessary that the difference between the period ts and the pulse duration t KVB does not fall below a certain time, for example, is also always greater than 1 ms, that is:

ts - t KVB ≧ 1ms.
Figure imgb0006

Die letzte Gleichung zeigt, daß innerhalb einer Periode hinreichend Zeit für den erfindungsgemäßen "Offset" von 1ms für die Drehzahlinformation zur Verfügung stehen muß.The last equation shows that within a period there must be sufficient time for the "offset" according to the invention of 1 ms for the speed information.

Der Verbrauch läßt sich aus folgender Beziehung bestimmen:

Figure imgb0007

wobei KDB eine Durchflußkonstante darstellt.The consumption can be determined from the following relationship:
Figure imgb0007
where KDB is a flow constant.

Der Zusammenhang zwischen tKVB und tKVA ergibt sich damit zu:

Figure imgb0008

wobei ts min die Periodendauer bei maximaler Drehzahl und tKVA max die Impulsbreite bei maximalem Kraftstoffverbrauch ist.The relationship between t KVB and t KVA is thus:
Figure imgb0008
where ts min is the period at maximum engine speed and t KVA max is the pulse width at maximum fuel consumption.

Damit ergibt sich als Durchflußkonstante für die erfindungsgemäße Ausbildung:

Figure imgb0009
This results in the flow constant for the design according to the invention:
Figure imgb0009

Claims (6)

  1. Method of providing a plurality of items of information on the operating state of an internal-combustion engine, in particular an internal-combustion engine provided with a control device, having the following steps:
    - generation of a first item of information, in particular having a pulse duty factor,
    - generation of at least one further, second, periodic item of information, in particular in pulse form,
    - the items of information being combined in a single, electric combination signal,
    characterized in that the pulse widths assigned to the items of information are added every combination signal period.
  2. Method according to Claim 1, characterized in that the first item of information is an item of information on consumption (TVB), the pulse duty factor of which depends on the level of fuel consumption.
  3. Method according to one of the preceding claims, characterized in that the second item of information is an item of information on the speed (TD) of the internal-combustion engine.
  4. Method according to one of the preceding claims, characterized in that the pulse duration of the first item of information is increased by a constant time period, assigned to the second item of information, for forming the combination signal (TD/VB).
  5. Method according to one of the preceding claims, characterized in that, for determining the first item of information at the receiving location of the combination signal (TD/VB), the constant time period is subtracted again to obtain the original pulse duty factor.
  6. Method according to one of the preceding claims, characterized in that the second item of information is formed by a periodic needle pulse signal.
EP90124339A 1990-02-07 1990-12-15 Method for the disposal of electric information values Expired - Lifetime EP0440942B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4003582 1990-02-07
DE4003582A DE4003582A1 (en) 1990-02-07 1990-02-07 METHOD FOR PROVIDING ELECTRICAL INFORMATION SIZES

Publications (3)

Publication Number Publication Date
EP0440942A2 EP0440942A2 (en) 1991-08-14
EP0440942A3 EP0440942A3 (en) 1992-03-18
EP0440942B1 true EP0440942B1 (en) 1994-08-10

Family

ID=6399579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124339A Expired - Lifetime EP0440942B1 (en) 1990-02-07 1990-12-15 Method for the disposal of electric information values

Country Status (3)

Country Link
EP (1) EP0440942B1 (en)
JP (1) JP3041057B2 (en)
DE (2) DE4003582A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4125678C2 (en) * 1991-08-02 1994-09-22 Audi Ag Transmission device for exchanging information with pulse-width-modulated signals between electronic devices in vehicles
EP0871037A1 (en) * 1997-04-07 1998-10-14 Siemens Aktiengesellschaft Circuit arrangement for monitoring an electronic circuit
DE19717933A1 (en) * 1997-04-29 1998-11-05 Thomson Brandt Gmbh Circuit arrangement with an encoder and an evaluation circuit
JP2007333523A (en) * 2006-06-14 2007-12-27 Mitsubishi Electric Corp Distance measurement device
JP2008070358A (en) * 2007-08-08 2008-03-27 Hitachi Ltd Traveling control device for vehicle
JP2012205376A (en) * 2011-03-25 2012-10-22 Minebea Co Ltd Drive control device for motor
JP6088170B2 (en) * 2012-07-17 2017-03-01 日立オートモティブシステムズ株式会社 Control device for electric oil pump for vehicle
FR3042052B1 (en) 2015-10-02 2017-11-10 Peugeot Citroen Automobiles Sa METHOD FOR DIAGNOSING AN ELECTRIC ACTUATOR CONNECTED TO A COMPUTER
US10145860B2 (en) * 2016-03-11 2018-12-04 Epro Gmbh Speed detection using multiple processing paths

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1340227A (en) * 1962-08-07 1963-10-18 Prec Mecanique Labinal Method and device for remote transmission
US3225309A (en) * 1963-12-05 1965-12-21 John H Phelps Pulse wave generator with independent control of pulse repetition frequency and duty cycle
DE2034067A1 (en) * 1970-07-09 1972-01-20 Bosch Gmbh Robert Electronic fuel consumption meter

Also Published As

Publication number Publication date
DE59006773D1 (en) 1994-09-15
EP0440942A2 (en) 1991-08-14
JPH04213795A (en) 1992-08-04
JP3041057B2 (en) 2000-05-15
EP0440942A3 (en) 1992-03-18
DE4003582A1 (en) 1991-08-08

Similar Documents

Publication Publication Date Title
DE2702054C2 (en) Spark timing circuit
DE1928679C3 (en) Electrical circuit arrangement for testing the ignition system of internal combustion engines
EP0683309A1 (en) Method of control of internal combustion engine in emergency mode
DE830119C (en) Electrical addition circuit for receiving simultaneous current pulse pairs
DE3237407C2 (en) Display device for automobiles
DE2951622A1 (en) ARRANGEMENT FOR OBTAINING SIGNALS FOR IGNITION AND / OR FUEL INJECTION FOR A 4-STROKE COMBUSTION ENGINE
DE2728598A1 (en) DIGITAL-ELECTRONIC TIMING SETTING SYSTEM
EP0440942B1 (en) Method for the disposal of electric information values
DE3044523A1 (en) ENGINE ANALYZER
DE3127220C2 (en) Device for generating a speed-dependent signal sequence
EP0472877B1 (en) Apparatus to determine the rotational speed of an internal combustion engine
DE2812325A1 (en) ELECTRONIC IGNITION CONTROL SYSTEM
DE2804444C2 (en)
DE19513597C2 (en) Method for cylinder recognition in an internal combustion engine
DE3780694T2 (en) ELECTRONIC DISTRIBUTOR FOR A VEHICLE MACHINE.
DE2941716A1 (en) DEVICE FOR MEASURING THE FUEL CONSUMPTION OF AN INTERNAL COMBUSTION ENGINE
DE2733689C3 (en) Method and device for generating pulses with a physical measured variable, essentially directly proportional pulse repetition frequency
EP0455649A1 (en) Processes for assigning ignition signals to a reference cylinder.
DE3533529C2 (en)
DE3246060A1 (en) LIGHT EMISSION DELAY CIRCUIT
DE2931622C2 (en) Device for displaying a certain speed limit
DE2431799B2 (en) CIRCUIT FOR PROCESSING IMPULSE-SHAPED MEASURING SIGNALS OF AN INDUCTIVE SENSOR THAT TAPS THE IGNITION CURRENT IN THE IGNITION SYSTEM OF A GASOLINE ENGINE
DE4241790B4 (en) Method and device for operating control devices, in particular for vehicles
DE3735900C2 (en)
EP0133426A2 (en) Method for the rapid control of an average value, especially the arithmetic average of an almost periodic signal

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ROBERT BOSCH GMBH

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19920821

17Q First examination report despatched

Effective date: 19930920

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 59006773

Country of ref document: DE

Date of ref document: 19940915

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19941014

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19951130

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19951214

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960222

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19961215

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19961215

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19970829

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970902

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20051215