WO1988005390A1 - Procede et systeme de calcul pour un echange bidirectionnel de signaux entre un systeme de calcul et un terminal d'interrogation relie a celui-ci - Google Patents

Procede et systeme de calcul pour un echange bidirectionnel de signaux entre un systeme de calcul et un terminal d'interrogation relie a celui-ci Download PDF

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Publication number
WO1988005390A1
WO1988005390A1 PCT/DE1987/000530 DE8700530W WO8805390A1 WO 1988005390 A1 WO1988005390 A1 WO 1988005390A1 DE 8700530 W DE8700530 W DE 8700530W WO 8805390 A1 WO8805390 A1 WO 8805390A1
Authority
WO
WIPO (PCT)
Prior art keywords
output
computer system
computer
output driver
computers
Prior art date
Application number
PCT/DE1987/000530
Other languages
German (de)
English (en)
Inventor
Wolfgang Drobny
Werner Nitschke
Peter Taufer
Hugo Weller
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
Priority to DE87DE8700530T priority Critical patent/DE3790887D2/de
Publication of WO1988005390A1 publication Critical patent/WO1988005390A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/0315—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for using multiplexing techniques

Definitions

  • the invention relates to a method for bidirectional signal exchange between a computer system and a query terminal connected to it, in particular for security systems in motor vehicles, e.g. Anti-blocking systems, air bags or belt tensioners, the computer system comprising at least one computer and an output driver.
  • security systems e.g. Anti-blocking systems, air bags or belt tensioners
  • the computer system comprising at least one computer and an output driver.
  • Such computers are used in the monitoring, control and regulation of processes.
  • One area of application is the control of safety systems in motor vehicles, such as anti-lock braking systems or passive restraint systems, for example inflatable gas cushions (air bags), which automatically take effect when the vehicle collides with an obstacle, or seat belts which are tensioned at the moment of the impact (belt tensioners).
  • Computer systems of this type are often connected to an interrogation terminal in order to display certain operating states and a possible operation.
  • Such an interrogation terminal consists of an optical or acoustic output signal generator and a mostly mechanically actuable input signal generator.
  • An operating state relevant to the display can be a malfunction in the computer program that blocks or falsifies the program flow.
  • a disturbance can e.g. caused by a circuit defect or by external influences such as radio interference from transmitters, electrical discharges or switching impulses on a line network.
  • the operation of the computer system to be carried out with the input signal transmitter can then consist in initiating a diagnostic routine or in setting the computer at a predetermined point in the program and restarting it.
  • connection of the query terminal "to the computer takes place via lines which, under certain circumstances, have to lead over several plug contacts when the query terminal is far from the computer due to operational constraints.
  • Connection lines and plug contacts increase the installation space and contribute to a deterioration of the susceptibility to interference.
  • the increase in installation space is caused by the fact that the distances between the plug contacts must adhere to certain minimum values and thus stand in the way of any reduction.
  • the susceptibility to faults can increase due to the fact that dirt increases the contact resistance between the contacts, and that thermal or vibration influences can lead to the conductor track or cable breaks or open plug contacts.
  • the invention has for its object to provide a method for bidirectional signal exchange between a computer system and an interrogation terminal connected to it, which helps to reduce the installation space of the computer system and the interrogation terminal and increases the reliability of the signal exchange.
  • This object is achieved in a method according to the preamble of claim 1 by the features specified in the characterizing part.
  • a reduction in half is achieved in comparison to signal lines that are otherwise customary.
  • each additional saving brings a percentage reduction in the number of lines. In borderline cases, this can lead to the fact that the use of a multi-computer system with a corresponding query terminal is facilitated and further application cases are opened.
  • the output signals transmitted to the output driver are formed from potentials or potentials deviating from a reference potential.
  • the output driver is switched off when a reference potential is applied and switched on when a potential deviating from the reference potential is applied.
  • This measure controls the output driver itself through the output signals. This eliminates the need to separately control the output driver via a control line.
  • the output driver can then also be arranged outside of a computer board or a computer housing without the number of plug connections required between the computer and the output driver being increased thereby. This design allows greater freedom in the arrangement of the modules. Circuitry technology also results in the generation of control signals on the part of the computer program-specific advantages.
  • the output signals of the computers are preferably logically linked to the.
  • Output driver and the computers are synchronized with respect to the first and second time period.
  • the logical link is expediently carried out as an OR link.
  • an exclusive OR or an AND link can also be advantageous.
  • the link allows the same output driver to be used for all existing computers in the computer system. Are several computers located within a spatial complex, so the logical links can also help r line capacitances and Steckverbin ⁇ compounds save.
  • the input and output signals are preferably formed by static potentials and the first time period is dimensioned much longer than the second time period. - 1 -
  • This configuration makes it possible to display or input static signals directly on the input and output side without coding means.
  • This feature of the method thus also contributes to simplification of the computer system including the query terminal and thus indirectly to an increase in reliability by reducing the number of modules which may be susceptible to faults.
  • the measurement of the first time period as significantly shorter than the second time period accommodates the inertia of the human senses by giving the impression that the output signals are constantly present.
  • the ratio of the first to the second period is approximately 100: 1.
  • This dimensioning ensures that the interruption of the output signal remains unnoticed. Is used as an output signal generator e.g. If an optical display is used, the impression of a flicker-free display is created. In contrast, the short time available for signal input is sufficient to carry out signal input safely.
  • the cycle of the first time period is 100 ms and the second time period is 1 ms.
  • This time is precisely such that even if the input signal transmitter is briefly actuated, the second time period is run through at least once. This is usually sufficient for safe operation. Only an intentionally extremely brief actuation can cause the input signal transmitter to be activated only during the first period of time and therefore not being passed on to the computer system. However, this case can be disregarded.
  • the invention further relates to a computer system connected to an interrogation terminal for bidirectional signal exchange, which comprises at least one computer and an output driver, in particular for safety devices in motor vehicles, such as anti-lock braking systems, air bags or belt tensioners, in which case the exit of the Computer or outputs of the computer are connected to the query terminal via the output driver and a line.
  • the invention is based on the object of using a query terminal for bidirectional signal exchange to create a bound computer system which, compared to previous solutions, achieves a reduction in the space taken up by the modules as a whole and at the same time increases the reliability of the signal exchange.
  • the invention enables the alternate transmission of input and output signals over the same line. Since the output of the output driver can be connected directly to the input of the computer, the need for a separate plug connection for the input signal line is eliminated in computers in which the output driver is arranged on the same board as the computer. This reduces the number of lines and plug contacts required for signal exchange between the computer and the query terminal by half. Accordingly, the construction space of the computer, which is predetermined in particular by the number of plug contacts, is reduced.
  • plug contacts and lines also reduces the probability of failure due to dirty or open plug contacts and line breaks.
  • each plug contact and each line is subject to the same interference probability and that the function of the entire computer system can be impaired in the event of such a fault, the probability of failure can be reduced by reducing these sources of interference.
  • the reduction in spatial dimensions also results in a reduction in mass. If the computer system is subjected to mechanical stresses, e.g. Exposed to decelerations or accelerations, the properties obtained with the invention also reduce the risk of mechanical destruction.
  • the one for alternating switching of the output driver and the switch required for the input or the inputs, together with the switching signal generator driving it, can be implemented separately both by physical modules and by a computer program and the modules already present in the computer or computers.
  • the last option is preferable because it is in line with the demand for a reduction in space.
  • the solution according to the invention can be used in the same way for computer systems with one and with several computers.
  • the output driver can be switched on and off by the signal present at the output of the computer or by the signals present at the outputs of the computer.
  • This measure controls the output driver itself through the output signals. A separate control via an additional control line is not necessary. Even if the output driver is arranged on the same board as the computer, there is no additional control port of the computer.
  • the control of the output driver can be carried out particularly easily if the output driver is switched off when a reference potential is applied and switched on when a potential deviating from the reference potential is applied.
  • Such an output driver is suitable for control with digital signals in which one potential state corresponds to the switched-off operating state of the output driver and another potential state corresponds to the switched-on operating state.
  • the connected computer is thus able to control the operator without additional coding measures and to switch it on and off at the same time.
  • the output driver is equipped with an open collector output.
  • This type of output circuit enables the output of the output grinder to be set to reference potential independently of its control, without causing damage. This means that any enables synchronized actuation of the input of the interrogation terminal.
  • the computer system comprises several computers which are to communicate with the same query terminal, it is expedient to connect the outputs of the computers to the output driver via a logic link and to synchronize the computers with regard to the switching signals of their switching signal generators.
  • the computers are preferably designed as static output signal transmitters and input signal receivers.
  • the signal transmission permits direct control of output signal transmitters and direct processing of the Signals from input signal generators.
  • the query terminal comprises an output signal light and an input signal switch, the input signal switch being connected between the line and the reference potential, while the output signal light is between the line and a potential deviating from the reference potential, preferably supply voltage potential ; is switched.
  • output and input signal transmitters are suitable for control with static potentials, are uncomplicated and robust in construction, are inexpensive to manufacture and are distinguished by a small space requirement.
  • the switching ratio of the switching signal generator is dimensioned such that the first time period is considerably longer than the second. In a practical embodiment, the switching ratio of the first to the second period is 100: 1.
  • This dimensioning ensures that the output signal is interrupted unnoticed. If an optical display is used as the output signal transmitter, is the impression of a flicker-free display. In contrast, the shortness of the time available for the signal input is sufficient to carry out the signal input safely.
  • the period of the switching signal generator is preferably approximately 100 ms.
  • This time is chosen such that the second time period is run through at least once even when the input signal transmitter is briefly actuated. This is usually sufficient for safe operation.
  • the output driver comprises an operational amplifier designed as a comparator.
  • a non-inverting input is fixed by means of a voltage divider formed from resistors 42 and 44 to an H potential that can be output by the logic logic circuit between the reference potential.
  • An inverting input is connected to the output of the logic logic circuit and to a resistance lying against the reference potential.
  • an output is connected to the common line and a resistor lying against a supply voltage potential.
  • the output driver designed in this way combines the properties in the power stage for tuning an output signal transmitter with a switch which suddenly changes its polarity at the output when a predetermined potential is exceeded. In this way, a defined output signal is obtained which leaves no uncertainties about the switching state open. Tolerances in the level of the output signal of the logic logic circuit can be compensated for in this way.
  • FIG. 2 shows an embodiment of the invention with an output driver and a query terminal with discrete components
  • 3 shows a graphical representation of the temporal course of various operating states of the potential of the line using the example of the embodiment shown in FIG. 2.
  • FIG. 1 shows a query terminal 10 for mutual signal exchange with a computer system, the computer system comprising two computers A and B and an output driver 12. Outputs 14 of the computers A, B are connected to the query terminal 10 via the output driver 12 and a line 16, and the query terminal 10 is connected to inputs 18 of the computers A and B via the same line 16.
  • the computers A and B are designed to achieve the object according to the invention as switching signal generators 20 and switches 22, which is indicated by functional blocks in the interior of the frames characterizing the computers A, B.
  • the actual data processing takes place via a function block designated as central unit 24.
  • the switches 22 are designed such that either the input 16 or the output 14 is switched through to the line 16.
  • the outputs 1 of the computers A and B are connected to the input of the output driver 12 via a logic logic circuit 28, which is designed here in the form of an OR logic connection implemented with diodes.
  • dashed lines indicate control lines that lead from the switch 22 to the output driver 12. This is to show that the output driver 12 can be switched on and off by the computers A and B.
  • the control lines like the signal lines, are linked by a logic link circuit 26 in the form of an OR circuit.
  • the control lines indicated by dashed lines are not present in the preferred embodiment since the output driver 12 is switched on and off by the output signals themselves.
  • a preferred area of application for such an arrangement is security systems in motor vehicles.
  • the computers A and B are used to evaluate measured values, for example acceleration and deceleration values, and to use them to obtain control signals with which actuators are controlled. For your own radio tion control and that of the other computers process computers A and B from time to time. If a malfunction is found, this operating state is displayed on the query terminal 10.
  • the driver who has become aware of the malfunction now has the option of issuing a diagnostic request by actuating an input signal transmitter of the query terminal 10, which causes the computer to determine whether the malfunction can be remedied or not. If the fault can be remedied, the display goes out, if it cannot be remedied, the display remains and signals the driver to immediately go to the workshop.
  • the signal exchange between the computers A and B on the one hand and the output terminal 10 on the other hand takes place in the following manner.
  • the outputs 14 are at reference potential.
  • the output driver 12 is switched off and an output signal generator of the interrogation terminal 10 is not in the excited state.
  • the output driver 12 is switched on by the link circuit 28 from the output signal and the output signal reaches the query terminal 10 via line 16. An output signal transmitter is then set to the excited state.
  • the time period in which the output signal is present at the output driver is determined by the switching signal generator 20, which only connects the output 14 to the control line 16 by switching on the output driver for a first time period.
  • the line 16 is switched to the input 18.
  • the ratio between the first and second time spans is 100: 1 and the cycle of the time spans, which corresponds to the period of the switching signal generator 20, is 100 ms. This gives the driver the impression that the interrogation terminal's output signal generator is continuously excited.
  • computers A and B are only designed as blocks, since their design corresponds to that shown in FIG. 1.
  • the output driver used here is a comparator 38, the non-inverting input 14 of which, by means of a voltage divider consisting of resistors 42 and 44, has a potential which is between a reference potential 38 and a H potential of the computers A, B is.
  • the inverting input 46 is connected to the output of the logic circuit 26.
  • An output 50 of the comparator 38 which is designed as an open collector output, is connected to the line 16 and additionally to the supply voltage potential 34 via a resistor 52.
  • the query terminal 10 comprises an output signal lamp 30 as an output signal generator and an input signal switch 32, which can also be designed as a button, as an input signal generator.
  • the lamp 34 is arranged between the line 16 and the supply voltage potential 34, while the switch 32 lies between the line 16 and the reference potential 36.
  • the output driver 12 If the output driver 12 is not activated, its input 46 is pulled to the reference potential 36 by the resistor 48. The potential at the input 40 is then higher than that at the input 46 and the output 50 is pulled to supply voltage potential 34 via the resistor 52 due to the lack of activation of the end transistor. The line 16 is thus also at the supply voltage potential 34 and the lamp 30 is switched off. If, on the other hand, the input 46 of the comparator 38 is driven with an H potential of the logic circuit 28, the end transistor of the comparator 38 is turned on and pulls the potential at the output 50 to a value between the supply voltage potential 34 and the reference potential 36. The lamp 30 is switched on.
  • the switch 32 If the switch 32 is actuated, the potential of the line 16 is in any case drawn to the reference potential 36. This switching state is evaluated by the latter as a diagnostic request during the second time period in which the potential of line 16 reaches input 18 of computers A and B.
  • the graphical representation of the temporal course of various operating states as potential on the line 16 illustrated in FIG. 3 illustrates several Cases. Two cycles of the first and second time period are shown, the time periods being designated by the numbers 1 and 2.
  • FIG. 3b there is a fault.
  • the potential of the line 16 lies between the supply voltage potential 34 and the reference potential 36 during the first period and to the supply voltage potential 34 during the second period.
  • FIG. 3c there is again a fault.
  • the switch 32 is turned on and remains actuated for a time t. This eliminates a previously signaled disturbance.
  • the potential of the line 16 lies between the supply voltage potential 34 and the reference potential 36 before the switch 32 is actuated, during the time t when the switch 23 is actuated to the reference potential 36 and after the switch has been opened and the fault has been eliminated, Ver supply voltage potential 34.
  • a fault is also signaled in FIG. 3d. However, this cannot be remedied.
  • the potential of the line 16 remains between the supply voltage potential 34 and the reference potential 36.
  • FIG. 3e shows the case in which no fault is signaled, but the switch 32 is still actuated.
  • the line 16 is present before and after the switch 32 is actuated at the supply voltage potential 34 and when the switch 32 is actuated at the reference potential 36.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Devices In Control Systems (AREA)

Abstract

Dans un système de calcul avec un ou plusieurs calculateurs et un étage d'attaque, qui est relié à un terminal d'interrogation pour un échange bidirectionnel de signaux, se pose le problème de réduire le volume utilisé pour les prises et les câbles de connexion et d'augmenter la sécurité de fonctionnement. Selon le procédé, dans un premier temps des signaux de sortie sont transmis en alternance à l'étage d'attaque et de celui-ci au terminal d'interrogation via un seul conducteur, et dans un deuxième temps l'étage d'attaque est mis hors service et des signaux d'entrée sont transmis par le même conducteur depuis le terminal vers le système de calcul. On diminue ainsi de moitié le nombre de conducteurs nécessaires. Cette mesure réduit le volume de construction et réduit la probabilité globale de pannes grâce à la suppression des contacts à fiches et des conducteurs supplémentaires qui peuvent être une soure de parasites dans certaines circonstances.
PCT/DE1987/000530 1987-01-22 1987-11-20 Procede et systeme de calcul pour un echange bidirectionnel de signaux entre un systeme de calcul et un terminal d'interrogation relie a celui-ci WO1988005390A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE87DE8700530T DE3790887D2 (en) 1987-11-20 1987-11-20 Verfahren zum bidirektionalen signalaustausch zwischen einem rechnersystem und einem mit diesem verbundenen abfrageterminal und mit einem abfrageterminal fuer einen bidirektionalen signalaustausch verbundenes rechnersystem

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873701681 DE3701681A1 (de) 1987-01-22 1987-01-22 Verfahren zum bidirektionalen signalaustausch zwischen einem rechnersystem und einem abfrageterminal und rechnersystem dafuer
DEP3701681.4 1987-01-22

Publications (1)

Publication Number Publication Date
WO1988005390A1 true WO1988005390A1 (fr) 1988-07-28

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PCT/DE1987/000530 WO1988005390A1 (fr) 1987-01-22 1987-11-20 Procede et systeme de calcul pour un echange bidirectionnel de signaux entre un systeme de calcul et un terminal d'interrogation relie a celui-ci

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WO (1) WO1988005390A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0393233A2 (fr) * 1989-04-15 1990-10-24 VDO Adolf Schindling AG Système de transmission de signaux
WO1996030231A1 (fr) * 1995-03-31 1996-10-03 Davey Bickford Dispositif de securite d'un vehicule
WO1997032758A1 (fr) * 1996-03-08 1997-09-12 Siemens Aktiengesellschaft Dispositif pour commander un systeme de protection des occupants d'un vehicule
WO1998009844A1 (fr) * 1996-09-07 1998-03-12 Bayerische Motoren Werke Aktiengesellschaft Bus de donnees pour vehicules comportant plusieurs systemes servant a la securite des occupants

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2406349A1 (fr) * 1977-10-12 1979-05-11 Ford France Dispositif de traitement d'informations, notamment pour vehicule automobile
US4176250A (en) * 1978-06-30 1979-11-27 General Motors Corporation Time division multiplexing system for an automobile
DE2838137A1 (de) * 1978-09-01 1980-03-13 Bosch Gmbh Robert Zeitmultiplexes informations- und befehls-uebertragungssystem
FR2446554A1 (fr) * 1979-01-15 1980-08-08 Marchal Equip Auto Dispositif d'alimentation electrique, de commande et de surveillance d'un ensemble d'organes notamment sur un vehicule automobile
EP0128574A2 (fr) * 1983-06-13 1984-12-19 Motorola, Inc. Dispositif de surveillance de charge électrique, et méthode
FR2557840A1 (fr) * 1984-01-10 1985-07-12 Daimler Benz Ag Dispositif de declenchement d'un systeme de protection de passagers dans des vehicules automobiles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2406349A1 (fr) * 1977-10-12 1979-05-11 Ford France Dispositif de traitement d'informations, notamment pour vehicule automobile
US4176250A (en) * 1978-06-30 1979-11-27 General Motors Corporation Time division multiplexing system for an automobile
DE2838137A1 (de) * 1978-09-01 1980-03-13 Bosch Gmbh Robert Zeitmultiplexes informations- und befehls-uebertragungssystem
FR2446554A1 (fr) * 1979-01-15 1980-08-08 Marchal Equip Auto Dispositif d'alimentation electrique, de commande et de surveillance d'un ensemble d'organes notamment sur un vehicule automobile
EP0128574A2 (fr) * 1983-06-13 1984-12-19 Motorola, Inc. Dispositif de surveillance de charge électrique, et méthode
FR2557840A1 (fr) * 1984-01-10 1985-07-12 Daimler Benz Ag Dispositif de declenchement d'un systeme de protection de passagers dans des vehicules automobiles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0393233A2 (fr) * 1989-04-15 1990-10-24 VDO Adolf Schindling AG Système de transmission de signaux
EP0393233A3 (fr) * 1989-04-15 1993-06-16 VDO Adolf Schindling AG Système de transmission de signaux
WO1996030231A1 (fr) * 1995-03-31 1996-10-03 Davey Bickford Dispositif de securite d'un vehicule
FR2732286A1 (fr) * 1995-03-31 1996-10-04 Davey Bickford Dispositif de securite d'un vehicule
US6052634A (en) * 1995-03-31 2000-04-18 Davey Bickford Vehicle safety device
WO1997032758A1 (fr) * 1996-03-08 1997-09-12 Siemens Aktiengesellschaft Dispositif pour commander un systeme de protection des occupants d'un vehicule
WO1998009844A1 (fr) * 1996-09-07 1998-03-12 Bayerische Motoren Werke Aktiengesellschaft Bus de donnees pour vehicules comportant plusieurs systemes servant a la securite des occupants

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