EP1325297A1 - Procede et dispositif permettant de mesurer la pression dans un systeme a air comprime destine a un vehicule a moteur lourd - Google Patents

Procede et dispositif permettant de mesurer la pression dans un systeme a air comprime destine a un vehicule a moteur lourd

Info

Publication number
EP1325297A1
EP1325297A1 EP01941419A EP01941419A EP1325297A1 EP 1325297 A1 EP1325297 A1 EP 1325297A1 EP 01941419 A EP01941419 A EP 01941419A EP 01941419 A EP01941419 A EP 01941419A EP 1325297 A1 EP1325297 A1 EP 1325297A1
Authority
EP
European Patent Office
Prior art keywords
compressed air
pressure
circuit
values
time
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.)
Withdrawn
Application number
EP01941419A
Other languages
German (de)
English (en)
Inventor
Ola Bergqvist
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.)
Scania CV AB
Original Assignee
Scania CV AB
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 Scania CV AB filed Critical Scania CV AB
Publication of EP1325297A1 publication Critical patent/EP1325297A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • 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 present invention relates to a method and an arrangement for pressure measurement in a compressed air system for a heavy vehicle in accordance with the preamble to patent claims 1 and 8 respectively.
  • a compressed air system for a heavy vehicle includes a compressed air compressor, a compressed air accumulator, a distributor, usually in the form of a distributor valve, and a number of compressed air circuits connected to the distributor valve.
  • Examples of the 15 circuits concerned included compressed air circuits for front brakes, for rear brakes, for trailer brakes, for accessories and for suspension etc.
  • control devices, operating devices etc. for performing the particular function.
  • One object of the present invention is to indicate a method and an arrangement for measurement of the kind mentioned in the introduction which obviate the disadvantages of the state of the art and provide reliable tightness monitoring without involving specific extra time and consequent costs.
  • the invention creates the possibility of regularly providing a basis for servicing decisions so that this important requirement can be met through the possibility of early detection of incipient degradation of one or more circuits of the compressed air system. It is thus more likely that any compressed air system repairs arising can be done on the occasion of ordinary servicing, thereby making it possible to minimise the need for servicing between such ordinary servicing occasions and the associated unscheduled standstills and extra costs.
  • Comparing measured pressure values with permissible values as a function of time provides the possibility of automatic evaluation of deviations, thus creating a more reliable basis for decisions. This applies particularly if values stored in a reference memory are used so that the vehicle driver's attention can be drawn to incipient degradation of any circuit.
  • the permissible values may possibly be at various levels, e.g. an "attention level”, a "warning level” and a "servicing level”. Inter alia, this can be arranged when setting a reference memory.
  • Comparisons between current pressure values in different circuits can be used to draw attention if the values for a given circuit deviate in such a way that there is probably leakage in that specific circuit.
  • Generating a control signal when deviations exceed a certain level provides the possibility of making the vehicle driver aware that the leakage is abnormal. It also makes it possible to use the control signal for shutting down a circuit affected by detected impermissible leakage.
  • measured values are stored in a measured- value memory in which values are available either directly via on-board equipment such as a display, a printer or the like or via externally connectable equipment.
  • on-board equipment such as a display, a printer or the like or via externally connectable equipment.
  • measured-value memory is not limitative but that various kinds of both directly received and processed values describing the pressure or pressure change in the particular circuit as a function of time may arise.
  • Fig. 1 depicts schematically a compressed air system incorporating an arrangement for pressure measurement according to the invention
  • Fig. 2 depicts a flowchart of a method for pressure measurement according to the invention. DESCRIPTION OF EMBODIMENTS
  • Fig. 1 depicts a compressed air system, designated generally by ref. 1, for a commercial vehicle and including a compressed air compressor 2, an accumulator tank 3 and a distributor valve 4.
  • the distributor valve 4 in this embodiment is a circuit protection valve which includes a protective function whereby pressure loss in a circuit can cause shutdown of that valve relative to the remainder of the compressed air system, provided that the circuit concerned is not vital for the operation of the vehicle, in which case the whole operation of the vehicle would have to come to a halt.
  • Using a circuit protection valve thus prevents pressure loss in the other circuits of the system.
  • a number of (here four) compressed air circuits 5 - 8 are connected to the distributor valve 4.
  • the circuits cater for particular equipment items, where there may be a number from the group: one circuit for front brakes, one for rear brakes, one for trailer brakes, one for suspension, one for extra equipment and so on.
  • each circuit there are control arrangements and operating arrangements in a conventional manner.
  • each circuit there is a pressure sensor 9 - 12 connected to a control unit 13.
  • the control unit thus receives signals from the pressure sensors 9 - 12.
  • a reference memory 14 for storing the set- values for the pressure in the respective circuits as a function of time or, to put it more simply, the permissible values for said pressures.
  • Ref. 15 denotes a measured-value memory designed to store values representing the pressure as a function of time in the respective circuits.
  • the measured- value memory 15 has connected to it an interface to make it possible to connect external equipment, e.g. for indicating or displaying measured-value data. This interface is denoted by ref. 16 and may of course be associated instead with the control unit 13.
  • a signalling unit 17 is connected to the control unit 13.
  • the signalling unit 17 generates an attention signal when impermissible leakage is observed in any of the circuits 5 - 8. This may be a light signal of any kind or an acoustic signal.
  • Fig. 2 is intended to illustrate a method sequence according to the invention whereby ref. 20 denotes the start of the sequence, which is initiated by, for example, the vehicle engine has been shut down or alternatively shutting down the engine for the nt time, meaning that the sequence starts after n shutdowns of the engine.
  • n is an integer, e.g. four. In this example the measuring sequence would thus be initiated every fourth time the engine is shut down.
  • Ref. 21 denotes the pressure in the circuits being measured as a function of time, and signals indicating the measured results being generated.
  • Ref. 22 denotes "permissible values" stored in the reference memory being retrieved and led to a comparator.
  • Ref. 23 denotes measured values being compared with said stored permissible values to ascertain the magnitude of the deviation between them.
  • Ref. 24 denotes a control signal being generated if the deviation exceeds a predetermined level. This control signal may for example be led to devices for shutting down a particular compressed air circuit.
  • Ref. 25 denotes display of measured values, which in its simplest form may be by means of lamps such as LEDs but may also be on a display or by printout of curves or discrete values representing pressures as a function of time, possibly with stored reference values intended as stored permissible values.
  • Ref. 26 denotes the end of the sequence.
  • control system may do comparisons between current values for the various circuits to see whether any circuit is deviating from the other circuits with regard to leakage.
  • Measured results may thus be stored so as to be available in the form of a constantly updated measurement record, and there may also be circuits for evaluating changes in leakage over time for the various circuits. Analysis of measured results may be done continuously or upon request. Analysis may take place on board the vehicle or when the vehicle visits a workshop. The combination of not only using reference values but also comparing current values for the various circuits makes it possible to improve redundancy and prevent incorrect indications.
  • Each circuit may also incorporate more than one pressure sensor.
  • Pressures may be measured continuously or at specified intervals of time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

La présente invention concerne un procédé et un dispositif qui permettent de mesurer la pression dans un système (1) à air comprimé destiné à un poids lourd et dans lesquels le système à air comprimé comprend un compresseur (2) entraîné par moteur et au moins un circuit (5-8) à air comprimé comprenant une ligne d'air comprimée et un répartiteur. L'arrêt du moteur du véhicule a pour effet de déclencher la mesure (21) de la pression dans chaque circuit (5-8) à air comprimé en fonction du temps et l'enregistrement (25) des valeurs mesurées résultantes. Toute fuite dans le circuit peut ainsi être surveillée. La présente invention concerne également un système à air comprimé qui comprend un tel dispositif.
EP01941419A 2000-08-16 2001-06-20 Procede et dispositif permettant de mesurer la pression dans un systeme a air comprime destine a un vehicule a moteur lourd Withdrawn EP1325297A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0002913A SE515781C2 (sv) 2000-08-16 2000-08-16 Förfarande och anordning för tryckmätning i ett tryckluftsystem till ett tungt fordon
SE0002913 2000-08-16
PCT/SE2001/001396 WO2002014825A1 (fr) 2000-08-16 2001-06-20 Procede et dispositif permettant de mesurer la pression dans un systeme a air comprime destine a un vehicule a moteur lourd

Publications (1)

Publication Number Publication Date
EP1325297A1 true EP1325297A1 (fr) 2003-07-09

Family

ID=20280702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01941419A Withdrawn EP1325297A1 (fr) 2000-08-16 2001-06-20 Procede et dispositif permettant de mesurer la pression dans un systeme a air comprime destine a un vehicule a moteur lourd

Country Status (4)

Country Link
EP (1) EP1325297A1 (fr)
BR (1) BR0112836A (fr)
SE (1) SE515781C2 (fr)
WO (1) WO2002014825A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10138777A1 (de) * 2001-08-07 2003-02-20 Kunze Silvia Verfahren zur Funktionsüberwachung von Zuleitungen für mit einem druckbeaufschlagten Medium betriebene Aggregate sowie zugehörige Funktionsüberwachungseinrichtung
EP1342596B1 (fr) * 2002-03-08 2007-12-19 Continental Aktiengesellschaft Détection des fuites d'air dans un dispositif de réglage du niveau à ressorts pneumatiques
DE102007025835B4 (de) * 2007-06-02 2012-09-06 Daimler Ag Diagnose von Leckagen an Druckluftsystemen, insbesondere in Nutzfahrzeugen
SE537024C2 (sv) * 2011-06-22 2014-12-09 Scania Cv Ab Anordning och förfarande för läckagedetektering hos ett tryckluftssystem
DE102016214370B3 (de) * 2016-08-03 2017-12-14 Audi Ag Hydrauliksystem für ein Automatikgetriebe eines Kraftfahrzeugs
DE102019100788A1 (de) 2019-01-14 2020-07-16 Wabco Gmbh Verfahren zur Leckageüberwachung einer Druckluftanlage

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4361825A (en) * 1980-05-16 1982-11-30 Southern Railway Company Automatic train-line air brake pressure monitoring system
CH639520B (de) * 1982-01-26 Valentin Volken Pruefgeraet zur feststellung der ansprechzeit in druckluftanlagen.
US4487060A (en) * 1983-05-18 1984-12-11 Glenayre Electronis, Ltd. Railway brake pressure monitor
DE4039957A1 (de) * 1990-12-14 1992-06-17 Iveco Magirus Verfahren und vorrichtung zum testen des bremssystems eines fahrzeugs im statischen betrieb
DE4206240A1 (de) * 1992-02-28 1993-09-02 Bosch Gmbh Robert Druckluft-bremsanlage fuer kraftfahrzeuge
SE501958C2 (sv) * 1992-10-02 1995-06-26 Statens Jaernvaegar Metod och bromsprovningssystem för provning av tätheten i ett pneumatiskt bromssystem
US5572187A (en) * 1994-05-23 1996-11-05 Williford; Robert F. Air brake monitoring and safety system
US5892437A (en) * 1995-08-21 1999-04-06 University Of Washington On-board brake warning device for air brake equipped vehicles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0214825A1 *

Also Published As

Publication number Publication date
WO2002014825A1 (fr) 2002-02-21
SE0002913D0 (sv) 2000-08-16
BR0112836A (pt) 2003-08-26
SE0002913L (sv) 2001-10-08
SE515781C2 (sv) 2001-10-08

Similar Documents

Publication Publication Date Title
US5257190A (en) Interactive dynamic realtime management system for powered vehicles
EP1757506B1 (fr) Système de pronostic et diagnostic pour freins à commande pneumatique
US5844475A (en) Apparatus for alarming abnormality of tire air pressure
US7363127B2 (en) Air brake system monitoring for pre-trip inspection
US6625526B2 (en) Method and device for monitoring vehicles and/or control functions
AU619427B2 (en) Non-volatile fault display with magnetic reset switch for adaptive braking system
EP1717122B1 (fr) Système et méthode de surveillance de pression de freinage pour véhicule
US6114952A (en) Diagnostic communication interface unit for an adaptive braking system
US4328480A (en) System for monitoring the lubricating-oil pressure of an engine
JP5053393B2 (ja) タイヤ空気圧偏差を推定するシステム、方法、およびコンピュータ・プログラム
JP2004515395A (ja) 自動車のタイヤの空気圧を監視する装置と方法
JPH05223411A (ja) 冷却設備における冷却媒体・充填レベルの監視方法
US8087732B2 (en) Method and apparatus for detecting a circuit failure in a vehicle brake system
US9168900B2 (en) Brake monitoring system with multiple inputs
KR100489470B1 (ko) 차량용유압브레이크시스템
US6687592B2 (en) Power train monitoring
US20030079536A1 (en) Method and system for monitoring a tire air pressure
CN111791867B (zh) 商用车气制动系统气压报警方法
EP1325297A1 (fr) Procede et dispositif permettant de mesurer la pression dans un systeme a air comprime destine a un vehicule a moteur lourd
CN112924104A (zh) 制动气压检测方法和装置、车辆和可读存储介质
WO2001096146A1 (fr) Dispositif de balayage automatique guide vocalement permettant d'effectuer une analyse de comparaison, un diagnostic, et la maintenance preventive d'un vehicule au moyen de donnees de vehicule detectees
US7089815B2 (en) Air brake system characterization by self learning algorithm
US5783990A (en) Method of detecting and documenting exhaust-gas relevant malfunctions of a vehicle having an internal combustion engine utilizing onboard means
KR20000011099A (ko) 표시장치
US20080278304A1 (en) Method and Apparatus for Monitoring Pressure of Vehicle Tires

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

17P Request for examination filed

Effective date: 20030317

AK Designated contracting states

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20070802