EP0228636B1 - Procédé pour déterminer divers états de fonctionnement d'un véhicule à moteur - Google Patents

Procédé pour déterminer divers états de fonctionnement d'un véhicule à moteur Download PDF

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Publication number
EP0228636B1
EP0228636B1 EP86117348A EP86117348A EP0228636B1 EP 0228636 B1 EP0228636 B1 EP 0228636B1 EP 86117348 A EP86117348 A EP 86117348A EP 86117348 A EP86117348 A EP 86117348A EP 0228636 B1 EP0228636 B1 EP 0228636B1
Authority
EP
European Patent Office
Prior art keywords
pattern
sensor
patterns
motor vehicle
evaluator
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
EP86117348A
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German (de)
English (en)
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EP0228636A1 (fr
Inventor
Max Josef Probst
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.)
Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0228636A1 publication Critical patent/EP0228636A1/fr
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Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/004—Indicating the operating range of the engine

Definitions

  • the invention relates to a method according to the preamble of patent claim 1.
  • the invention is based on the object of significantly improving a method of the type mentioned both with regard to the amount of information received and with regard to the implementation in measures resulting therefrom.
  • the at least two-dimensional pattern that is known from the fields of speech recognition.
  • the output signal of the sensor is evaluated by the analyzers with regard to all or a large part of the information contained therein. Every piece of information influences the pattern in a characteristic way.
  • the comparison of the features of the current pattern with the features of the predefined patterns then readily leads to a concrete statement of the extent to which the current operating state can still be tolerated or to what extent it has already approximated a critical operating state.
  • a pressure sensor can be used as an application of the invention, for example, which determines the load on a chassis spring of a motor vehicle at the point of contact.
  • the further information contained therein such as the fundamental frequency, excitation frequency, amplitude and change in these frequencies and amplitudes, are converted into a corresponding form of the pattern in addition to the primary information of the pressure.
  • the comparison of the current pattern with the predefined patterns is carried out using conventional image comparison methods, for example with the aid of a correlation analysis. In the latter case, the correlation coefficient is a precise statement about the agreement of the current pattern with a predetermined pattern.
  • other methods for image analysis are also possible, such as those used in the context of photographic images to automatically focus the image.
  • a memory-consuming map is not required in the invention, since the features of the patterns can be compressed to a great extent without significant loss of content.
  • Each operating state is recognizable in an image and, due to the characteristic image shape, reveals at an early stage a tendency to reach a critical operating state. This makes it possible to trigger warning or display measures for this critical operating state in good time and to avoid this operating state with certainty.
  • the content of claim 2 shows a possibility to create the given pattern based on the respective specific application and thus to get a realistic picture of the operating conditions actually occurring and their effects on the information.
  • this measure offers the advantage of obtaining the samples individually and thus obtaining precise information about the actual operating state at all times.
  • the measure according to claim 3 extends the practical use of the invention, since with the help of the additional acoustic information the user of the motor vehicle is given additional help in avoiding a critical operating state by taking appropriate countermeasures.
  • the measure which is described in claim 4, is concerned with limiting the current operating state with the aid of the further operating variables and thus speeding up and specifying the matching of the predefined pattern. This is of considerable importance, especially for rapid changes in the operating state, since even then the relevant, predetermined pattern can be found in a short and still sufficient time.
  • the output signal of a single sensor is used on the one hand directly and on the other hand is analyzed in different ways in order to obtain a two-dimensional pattern.
  • This sensor is, for example, a pressure sensor P, which is arranged between a wheel spring and the vehicle body. The wheel in turn can be the right front wheel.
  • the analysis of the output signals supplied by such a pressure sensor in the form of a variable alternating voltage U can be carried out using a Fast Fourier transformation, a fundamental frequency analysis and an analysis of the energy content can be carried out over a predetermined frequency band.
  • a Fast Fourier transformation a fundamental frequency analysis
  • an analysis of the energy content can be carried out over a predetermined frequency band.
  • circuits in which these three analyzes are carried out are denoted by 2, 3 and 4 in FIG. 1 and work in parallel with an analog / digital converter 1, via which the signal U is digitized.
  • the output signals of circuits 1 to 4 are fed to a pattern generator 5, which works in a known manner.
  • a pattern generator 5 which works in a known manner.
  • Analogous to the output signal of the pressure sensor P in FIG. 1, such analyzes are also common with speech signals.
  • FIG. 2 The extraction of such a pattern within the scope of the invention is shown schematically in FIG. 2.
  • U contains two components, one of which (GF) represents the fundamental frequency and the other a vibration behavior which is influenced by various influencing variables. These include the condition of the road surface, tire pressure, steering angle or various acceleration factors as well as axle and wheel angles. They all result in a typical image for the frequency spectrum, which is converted into a two-dimensional pattern in the pattern generator 5.
  • the dimensions of this pattern are determined by the output signals of circuits 1 to 4 and show, for example, the rectangular behavior shown.
  • the corner coordinates I-IV are determined by the basic frequency f g at time t 1 (point I), the basic frequency at time t 2 (point 11), the averaged excitation frequency at time t 1 (point 111) and the excitation frequency at time tz ( Point IV).
  • the abscissa value of point 111 is chosen to be the same as that of point I.
  • the abscissa values of points II and IV are determined, starting from the point with an arbitrarily chosen abscissa value, in such a way that the area of the square formed by points to IV corresponds to the value of the energy content which is output as the output value of circuit 4.
  • a pattern is assigned to the possible driving states of a motor vehicle, which lies on one of the six or, ideally, an infinite number of curves.
  • each of these curves is characterized by a relevant parameter, the other parameters being unchanged.
  • the variable parameters are e.g. Centripetal force, coefficient of adhesion, acceleration, camber angle, wheel lock and chassis constants.
  • the end points of the curves are connected to each other by an envelope H, which describes all critical driving conditions that occur.
  • a motor vehicle runs through a number of driving states during its operation, which are shown in the form of a two-dimensional pattern formed with the pattern generator 5. These patterns are included in the patterns shown schematically in FIG. 3. The correspondence of the current pattern with one of the patterns shown in FIG. 3 can be determined with the aid of conventional image comparison techniques, as will be explained in more detail below.
  • the countermeasures to be initiated can now consist in the usual way of intervening in the engine or brake control or in some other way serving to prevent the critical driving state. This also includes an indication to the user of the motor vehicle when the operating state of the motor vehicle approaches a critical state.
  • Predefined two-dimensional patterns to be used can be done in different ways. It is possible to specify the patterns shown in FIG. 3 in a pattern memory 6 in FIG. 1. In contrast to this specification of the comparison pattern, which is valid for all motor vehicles of one type, it is also possible to obtain these patterns using the respective motor vehicle.
  • a teach-in circuit known per se for example from the field of production technology, is used, with which it is possible to save these patterns under predetermined operating states.
  • a button 10 shown schematically, which activates the pattern memory 6 and enables it to hold the pattern supplied by the pattern generator 5 together with further information.
  • This information includes, for example, the type and size of the variable parameter which assigns the pattern to one of the six curves shown in FIG. 3 or describes its change in the course of this curve.
  • the pattern supplied by the pattern generator 5 is compared with all the patterns contained in the pattern memory 6. As already explained, the correspondence of the pattern originating from the pattern generator 5 with one of the stored patterns is determined with the aid of conventional image comparison techniques. This comparison takes place in a pattern comparator 7.
  • the given pattern can only be found in the area of two curves in the respective operating case.
  • the pattern comparator 7 thus uses only the predetermined patterns available in this area for comparison to compare the current pattern. This leads to a significant reduction in processing time.
  • the pattern comparator 7 additionally determines whether this operating state is an upcoming critical operating state. This is made possible, for example, by two e.g. current successive patterns supplied by the pattern generator 5 are compared at a defined time interval and the degree of approximation to the envelope H is determined. If the operating state of the motor vehicle approaches the critical operating state, the pattern of the envelope H also approximates. In this case, the pattern comparator 7 initiates warning and auxiliary measures.
  • the warning measures can consist, for example, in that warning texts are generated in a language generator (not shown) and output in the usual way.
  • the auxiliary measures are taken via a device 9 which, for example, carries out a brake intervention or an intervention in the engine or drive management.
  • Corresponding calculation methods are used for this purpose, which allow further dimensions of the pattern to be taken into account. These dimensions can take into account further operating parameters of the motor vehicle. These are e.g. Mass, centripetal force, coefficient of adhesion, acceleration, camber angle, wheel lock and chassis constant.
  • this multidimensional pattern processing amounts to the method that is shown with reference to FIGS. 1 to 3 for a two-dimensional pattern.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Navigation (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (4)

1. Procédé pour déterminer les états de fonctionnement d'un véhicule à moteur à partir des signaux de sortie d'un capteur (P) d'une grandeur de fonctionnement caractéristique, qui sont injectés d'une part directement et d'autre part en parallèle via un analyseur (2) dans un dispositif d'évaluation (5, 7) d'un paramètre caractéristique, caractérisé en ce que le signal de sortie d'un capteur est conduit également dans le dispositif d'exploitation (5, 7) après passage dans au moins un autre analyseur (3, 4) qui analyse en parallèle un autre paramètre, et que le dispositif d'exploitation (5, 7) produit au moins un modèle bidimensionnel, dont la forme est définie par les signaux de sortie du capteur (P) et les analyseurs (2, 3, 4), que le modèle est comparé à des modèles préétablis et qu'en se rapprochant d'un modèle limite d'état de fonctionnement critique cela déclenche une alarme ou un affichage.
2. Procédé selon la revendication 1, caractérisé en ce qu'on réalise les modèles préétablis dans une étape préalable d'apprentissage dans des conditions bien définies de fonctionnement et qu'on les classe dans une mémoire de modèles (6).
3. Procédé selon la revendication 2, caractérisé en ce que, simultanément aux modèles qui sont caractéristiques de l'approche d'un état de fonctionnement critique, on met en mémoire un signal d'alarme acoustique, qui est activé lors de l'approche de l'état de fonctionnement critique.
4. Procédé selon l'une des revendications 1 à 3, caractérisé par au moins un capteur pour une autre grandeur de fonctionnement, dont le signal de sortie est injecté dans le dispositif d'évaluation (5, 7) et qui commande l'accès aux modèles préétablis.
EP86117348A 1985-12-12 1986-12-12 Procédé pour déterminer divers états de fonctionnement d'un véhicule à moteur Expired - Lifetime EP0228636B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3543940 1985-12-12
DE3543940 1985-12-12

Publications (2)

Publication Number Publication Date
EP0228636A1 EP0228636A1 (fr) 1987-07-15
EP0228636B1 true EP0228636B1 (fr) 1990-06-27

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EP86117348A Expired - Lifetime EP0228636B1 (fr) 1985-12-12 1986-12-12 Procédé pour déterminer divers états de fonctionnement d'un véhicule à moteur

Country Status (5)

Country Link
US (1) US4849894A (fr)
EP (1) EP0228636B1 (fr)
DE (1) DE3672311D1 (fr)
ES (1) ES2015870B3 (fr)
WO (1) WO1987003720A1 (fr)

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Also Published As

Publication number Publication date
DE3672311D1 (de) 1990-08-02
ES2015870B3 (es) 1990-09-16
US4849894A (en) 1989-07-18
EP0228636A1 (fr) 1987-07-15
WO1987003720A1 (fr) 1987-06-18

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