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WO2002051679A1 - Procede et dispositif pour generer un signal de freinage - Google Patents

Procede et dispositif pour generer un signal de freinage Download PDF

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Publication number
WO2002051679A1
WO2002051679A1 PCT/DE2001/004737 DE0104737W WO02051679A1 WO 2002051679 A1 WO2002051679 A1 WO 2002051679A1 DE 0104737 W DE0104737 W DE 0104737W WO 02051679 A1 WO02051679 A1 WO 02051679A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
brake
switch
pressure sensor
logical
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.)
Ceased
Application number
PCT/DE2001/004737
Other languages
German (de)
English (en)
Inventor
Klaus Landesfeind
Thomas Braun
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 WO2002051679A1 publication Critical patent/WO2002051679A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems

Definitions

  • the invention relates to a method for generating a brake signal, comprising the steps of: generating a pressure sensor signal, comparing the pressure sensor signal with at least one threshold value and outputting a brake signal as a function of the comparison result.
  • the invention further relates to a device for generating a brake signal with means for generating a pressure sensor signal, means for comparing the pressure sensor signal with at least one threshold value and means for outputting a brake signal as a function of the comparison result.
  • FDR driving dynamics control
  • ABS anti-lock braking system
  • ASR anti-slip control
  • the invention is based on the generic method in that the pressure sensor signal with several
  • Thresholds are compared and that outputting the
  • Brake signal depends on other conditions, which with the comparison results. In this way, one is able to output a brake signal based on a pressure sensor signal even in the case of variable pressure conditions in a brake system.
  • a brake signal can be output when a pressure sensor signal is greater than a selected threshold, in which case no further conditions need to exist.
  • a brake signal can already be output at a lower threshold if the condition is additionally present that a pre-pressure adjustment takes place. If the threshold is even lower, a brake signal can be output if, in addition to the pre-pressure adjustment, the situation exists that the precharge pump is not being activated. If, in addition to this situation, there is the condition that the precharge pump does not run on, a brake signal can be output at a very low threshold.
  • a logical brake signal value is set to TRUE depending on the comparison results in combination with other conditions.
  • This logical brake signal value can then ultimately serve on the one hand to output a brake signal.
  • it can be linked with other logical values, for example to enable redundant provision of a brake signal.
  • the logical brake signal value and at least one signal of at least one switch are fed to an OR operation.
  • a combination of a hardware brake signal is found with the logical brake signal value instead, so that a brake signal can be generated regardless of the hardware switch.
  • the at least one signal of the at least one switch is preferably a brake light signal of a brake light switch. Since the brake light signal is often used to indicate a braking request and thus allow braking by the driver, it makes sense to "bypass" a possibly defective brake light signal by ultimately recognizing a braking request from the driver on the basis of the pressure sensor signal.
  • the logical brake signal value, a brake light signal and a signal from a further switch are preferably fed to an OR operation. In this way, additional security is provided by an additional redundant switch.
  • a logical brake signal value TRUE in the case of a logical brake signal value TRUE and the absence of the at least one signal of the at least one switch, an implausible state is concluded. If the system is working correctly, the value TRUE of the logical brake signal value should correlate with the presence of a signal from the at least one switch, for example the brake light switch. If this is not the case, the situation is implausible. Information can thus be transferred to an error memory.
  • an implausible condition is inferred if the conditions for the implausible condition exists for a minimum period. In this way it is avoided that brief fluctuations in the braking system, for example pressure fluctuations, lead to an error being stored.
  • the method can therefore ensure, on the one hand, that an error is entered or another action is taken with regard to the registration of the implausible state. However, it can also ensure that a driver's braking request is recognized despite a defective brake signal switch, so that braking, for example in regulation, is made possible.
  • the invention is based on the generic device in that the pressure sensor signal is compared with a plurality of threshold values and that the output of a brake signal depends on further conditions which are linked to the comparison results. In this way, one is able to output a brake signal based on a pressure sensor signal even in the case of variable pressure conditions in a brake system.
  • a brake signal can be output when a pressure sensor signal is greater than a selected threshold, in which case no further conditions need to be present.
  • a brake signal can already be output at a lower threshold if the condition is additionally present that a pre-pressure adjustment takes place. If the threshold is even lower, a brake signal can be output if, in addition to the pre-pressure adjustment, the situation exists that the precharge pump is not being activated. If, in addition to this situation, there is the condition that the precharge pump does not run on, a brake signal can be output at a very low threshold.
  • the device is particularly useful if, depending on the comparison results, in combination with other conditions, a logical brake signal value is set to TRUE and if a memory is provided for storing the value. This logical brake signal value can then ultimately serve on the one hand to output a brake signal. On the other hand, it can be linked with other logical values, for example to enable redundant provision of a brake signal. Furthermore, the device is advantageous in that the logical brake signal value and at least one signal of at least one switch are fed to an OR operation. In this way, a hardware brake signal is combined with the logical brake signal value, so that a brake signal can be generated independently of the hardware switch.
  • the at least one signal of the at least one switch is preferably a brake light signal of a brake light switch. Since the brake light signal is often used to indicate a braking request and thus permit braking by the driver, it makes sense to "bypass" a possibly defective brake light signal by ultimately recognizing a braking request from the driver on the basis of the pressure sensor signal.
  • the device according to the invention operates particularly reliably when the logical brake signal value, a brake light signal and a signal from a further switch are fed to an OR operation. In this way, additional security is provided by an additional redundant switch.
  • Means are preferably provided for monitoring a period of time, and an implausible state is inferred if the conditions for the implausible state exist for a minimum period. In this way it is avoided that brief fluctuations in the braking system, for example pressure fluctuations, lead to an error being stored.
  • a defective brake light switch is inferred from the implausible state.
  • a fault entry can thus be made which indicates a defective brake light switch.
  • the device according to the invention can also be useful if it is concluded from the implausible state that values that are too high are detected by a pressure sensor. Because even in this case it could be that the threshold values would be considered exceeded, which would lead to the implausible encounter of a brake signal value TRUE and the absence of the hardware signal. Consequently, a defective pressure sensor can be inferred in particular by using further information based on the invention.
  • a braking request from the driver is recognized on the basis of the braking signal.
  • driving can ensure that an error entry or other action is carried out with regard to the registration of the implausible state.
  • it can also ensure that a driver's braking request is recognized despite a defective brake signal switch, so that braking, for example, is made possible in controls.
  • the invention is based on the knowledge that by generating a brake light switch signal based on a pressure sensor signal, problems due to a faulty brake light switch are recognized and it can also be ensured that a driver's braking request is recognized even if the brake light switch is defective.
  • the invention solves the problem of a defective brake light switch in an extremely efficient manner, since a pressure sensor signal is delivered in any case in an FDR system, the different pressure conditions which are present in the brake system during operation of a vehicle being able to be taken into account.
  • FIG. 1 is a flow chart to explain the invention. Description of the embodiment
  • FIG. 1 shows a flow chart to explain the invention.
  • the step symbols given in the flowchart have the following meaning:
  • step S1 the pressure sensor signal from step S1 is first offset-corrected in step S2. This is followed by low-pass filtering in step S3.
  • step S4 the comparisons of the output signal from step S3 with predetermined threshold values take place. Requirements for a positive result of the comparison in step S4 and therefore for a positive answer to the decision in step S5 are as follows:
  • the pressure sensor signal is greater than a threshold 1.
  • the pressure sensor signal is greater than a threshold 2 and the form pressure has been adjusted.
  • the pressure sensor signal is greater than a threshold 3, and the admission pressure has been adjusted and the precharge pump is not activated.
  • the pressure sensor signal is greater than a threshold 4, and the admission pressure has been adjusted, and the precharge pump is not activated and the precharge pump does not run on.
  • step S4 If one of these conditions from step S4 exists, the question "Is there a comparison condition?" Is answered in step S5. answered yes and in step S ⁇ a logical brake signal value is set to TRUE. Otherwise, that is to say none of the conditions in step S4 is met, the logical brake signal value is set to FALSE in step S9.
  • step S7 the logical brake signal value, which is set to TRUE in this branch of the method sequence, is supplied with further signals of an OR operation.
  • This further signal can be the hardware signal of a brake light switch and possibly additionally a further signal of a second redundant hardware switch.
  • step S8 it is decided whether the present situation is plausible. For an error due to Plausibility is closed if the logical brake signal value is set to TRUE for a certain period of time, although the hardware signals do not indicate a driver's brake request and no pump was or is activated for some time. As a result, the brake light switch may be defective or the pressure sensor may display values that are too high.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Regulating Braking Force (AREA)

Abstract

L'invention concerne un procédé pour générer un signal de freinage, comprenant les opérations suivantes : créer un signal de détection de pression (S1), comparer ce signal de détection de pression avec au moins une valeur seuil (S5) et générer un signal de freinage en fonction du résultat de la comparaison. L'invention est caractérisée en ce que le signal de détection de pression est comparé (S5) avec plusieurs valeurs seuils, et que la génération d'un signal de freinage dépend d'autres données liées aux résultats de la comparaison. La présente invention porte également sur un dispositif pour générer un signal de freinage.
PCT/DE2001/004737 2000-12-23 2001-12-18 Procede et dispositif pour generer un signal de freinage Ceased WO2002051679A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10065012.0 2000-12-23
DE2000165012 DE10065012B4 (de) 2000-12-23 2000-12-23 Verfahren und Vorrichtung zum Erzeugen eines Bremssignals

Publications (1)

Publication Number Publication Date
WO2002051679A1 true WO2002051679A1 (fr) 2002-07-04

Family

ID=7668979

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/004737 Ceased WO2002051679A1 (fr) 2000-12-23 2001-12-18 Procede et dispositif pour generer un signal de freinage

Country Status (2)

Country Link
DE (1) DE10065012B4 (fr)
WO (1) WO2002051679A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE334028T1 (de) * 2002-09-04 2006-08-15 Luk Lamellen & Kupplungsbau Verfahren und vorrichtung zum überprüfen von bremssignalen bei einem fahrzeug
DE102005026262B4 (de) 2005-06-08 2024-09-12 Zf Cv Systems Hannover Gmbh Verfahren zur Prüfung eines Bremslichtschalters oder eines Kick-Down-Schalters
DE102015108778B4 (de) * 2015-06-03 2020-01-30 Borgward Trademark Holdings Gmbh System und Verfahren zur Bremserkennung für ein Fahrzeug

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0616931A1 (fr) * 1993-03-24 1994-09-28 Robert Bosch Gmbh Ensemble de valve relais pour contrôle de pression de freinage en fonction de l'usure des garnitures de frein
DE4338064C1 (de) * 1993-11-08 1995-03-16 Daimler Benz Ag Verfahren zur Überwachung der Funktion einer Vorrichtung zur Durchführung eines automatischen Bremsvorganges
DE19510525A1 (de) * 1995-03-23 1996-09-26 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung bzw. Regelung der Bremsanlage eines Fahrzeugs
DE19519309A1 (de) * 1995-05-26 1996-11-28 Continental Ag Bremspedalschalter für eine elektrisch betriebene Fahrzeugbremse
US5779329A (en) * 1995-06-08 1998-07-14 Jidosha Kiki Co., Ltd. Emergency brake system sensing pedal speed and pressure
EP0867350A2 (fr) * 1997-03-27 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Système de contrÔle de freinage pour véhicules
EP0891905A1 (fr) * 1996-04-05 1999-01-20 Toyota Jidosha Kabushiki Kaisha Dispositif de commande d'une force de freinage
EP0937614A2 (fr) * 1998-02-21 1999-08-25 Robert Bosch Gmbh Procédé et appareil pour commander un système de freinage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150098A (en) * 1990-11-13 1992-09-22 Robert Rakow Brake signaling system and process
DE19814574B4 (de) * 1998-04-01 2005-03-10 Bosch Gmbh Robert System zur Erzeugung eines Signals zur Ansteuerung der Bremsleuchten eines Kraftfahrzeugs
DE19901520A1 (de) * 1999-01-16 2000-07-20 Horst Neumann Kraftfahrzeugbremsleuchtsystem

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0616931A1 (fr) * 1993-03-24 1994-09-28 Robert Bosch Gmbh Ensemble de valve relais pour contrôle de pression de freinage en fonction de l'usure des garnitures de frein
DE4338064C1 (de) * 1993-11-08 1995-03-16 Daimler Benz Ag Verfahren zur Überwachung der Funktion einer Vorrichtung zur Durchführung eines automatischen Bremsvorganges
DE19510525A1 (de) * 1995-03-23 1996-09-26 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung bzw. Regelung der Bremsanlage eines Fahrzeugs
DE19519309A1 (de) * 1995-05-26 1996-11-28 Continental Ag Bremspedalschalter für eine elektrisch betriebene Fahrzeugbremse
US5779329A (en) * 1995-06-08 1998-07-14 Jidosha Kiki Co., Ltd. Emergency brake system sensing pedal speed and pressure
EP0891905A1 (fr) * 1996-04-05 1999-01-20 Toyota Jidosha Kabushiki Kaisha Dispositif de commande d'une force de freinage
EP0867350A2 (fr) * 1997-03-27 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Système de contrÔle de freinage pour véhicules
EP0937614A2 (fr) * 1998-02-21 1999-08-25 Robert Bosch Gmbh Procédé et appareil pour commander un système de freinage

Also Published As

Publication number Publication date
DE10065012B4 (de) 2014-08-07
DE10065012A1 (de) 2002-07-04

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