WO2009043405A1 - Système de freinage et unité électronique de traitement d'air pour des systèmes de freinage à air comprimé avec temporisateur et capteur de température intégrés - Google Patents

Système de freinage et unité électronique de traitement d'air pour des systèmes de freinage à air comprimé avec temporisateur et capteur de température intégrés Download PDF

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Publication number
WO2009043405A1
WO2009043405A1 PCT/EP2008/006146 EP2008006146W WO2009043405A1 WO 2009043405 A1 WO2009043405 A1 WO 2009043405A1 EP 2008006146 W EP2008006146 W EP 2008006146W WO 2009043405 A1 WO2009043405 A1 WO 2009043405A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
control unit
preparation unit
vehicle
brake
Prior art date
Application number
PCT/EP2008/006146
Other languages
German (de)
English (en)
Inventor
Giovanni Crapanzano
Jörg Fischer
Siegfried HÄFNER
Christian Herz
Michael Kokes
Ina Rastetter
Karl-Heinz Unser
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2009043405A1 publication Critical patent/WO2009043405A1/fr

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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
    • 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
    • B60T17/002—Air treatment devices
    • B60T17/004—Draining and drying devices
    • 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

Definitions

  • the invention relates to a brake system and an electronic air preparation unit for compressed-air brake systems, in particular in commercial vehicles. These systems are referred to in the jargon as E-APU (Electronic Air Processing Unit). They usually consist of air dryer, multi-circuit protection valve and control unit. The invention extends these air handling units by a timer, a temperature sensor and a diagnostic function. Also disclosed is a brake system equipped with the new air preparation unit.
  • E-APU Electronic Air Processing Unit
  • E-APU electronic air treatment unit
  • WABCO electronic air treatment unit
  • Knorr brake systems on the market.
  • Characteristics of this electronic air treatment unit are the integration of a control unit in the air preparation unit, consisting of air dryer and multi-circuit protection valve.
  • An example of such an electronic air preparation unit can be found, for example, in the product brochure E-APU from WABCO.
  • the brochure is available on the Internet at www.wabco-auto.com. Copyright note on the brochure 11/2005.
  • the electronic control unit has a CAN bus interface and can thus be networked with other control units in the electrical system of a commercial vehicle.
  • the E-APU controls the valves in the multi-circuit protection valve and responds to vehicle speed, brake status, engine status.
  • the system pressure is dynamically adapted to the driving conditions. In particular, depending on the driving condition of the cut-off of the Reduced compressor.
  • the cartridge of the air dryer is regenerated only when needed. Drainage takes place with every engine off. Diagnostic systems can access the data stored in the control unit of the E-APU via the CAN bus interface.
  • the WABCO and Knorr-Bremse systems offer the advantages of intelligent compressor control and air drying compared to conventional air handling units, but do not contain their own diagnostic functionality, self-wake-up mechanism or temperature detection.
  • the abovementioned air preparation units and the brake systems equipped therewith carry out diagnostic applications only via further control units or diagnostic testers, which must communicate via the CAN bus interfaces with the control unit of the air preparation unit for this purpose.
  • diagnostic functionalities are largely uncritical during operation of the vehicle or when the vehicle is already in service.
  • the pressure values of the individual pneumatic circuits are then to be recorded at defined time intervals during vehicle standstill and be evaluated.
  • the communication electrical system and several participating control units must be awakened for this purpose.
  • the CAN bus and the CAN bus controller must be awakened. This is risky in vehicle standstill, since in the case of a system error, for example in a connected control unit, it may happen that the CAN bus no longer sleeps in the time window between the individual measurements and queries. Thus, the energy storage of the stationary vehicle are exhausted.
  • the solution succeeds mainly with an electronic air preparation unit, which has its own and bus independent diagnostic functionality.
  • the control unit is supplemented by a software interface, which enables a flashing of the control unit, so that a diagnostic program can be implemented in the control unit.
  • the air preparation unit is supplemented by a temperature sensor and a timer in the control unit is designed and used to activate the microprocessor in the control unit at defined time intervals to start a measurement run.
  • the main advantages that can be achieved thereby are that measurement runs on the brake system can be carried out with very low energy input. It only needs to be woken up by a control unit.
  • a bus system does not have to be awakened for carrying out the measurements.
  • All necessary functionalities are combined in one unit of the braking system, namely the electronic air preparation unit.
  • the air preparation unit consisting of air dryer, multi-circuit protection valve and control unit provides access to all connected brake circuits via the multi-circuit protection valve and therefore enables pressure measurements in all brake circuits. By supplementing the air preparation unit with a temperature sensor that measures the ambient temperature, the measured pressures can also be converted into temperature compensated.
  • Implementing a Wake-up functionality in the control unit of the electronic air handling unit and the implementation of a diagnostic program allows the autonomous performance of the measurements and calculations on and for the brake system, without the need for other control units or bus systems need to be awakened.
  • the data recorded with the respectively performed measurement runs are stored separately for each measurement run. This makes it possible to compare the data obtained from the individual measurement runs with one another and to carry out at least first diagnostic runs onboard.
  • the pressure decreases in the individual brake circuits, preferably temperature-compensated, can be determined and calculated, and from this a leakage rate can be calculated for each brake circuit.
  • the diagnosis function of the air preparation unit can be used to detect a leak and be warned accordingly.
  • the control unit of the air handling unit can then be awakened via existing bus interfaces, in particular via CAN interfaces, and corresponding warnings can be communicated in the vehicle electrical system and stored in other control devices, which the driver then sees displayed the next time the vehicle is started.
  • the warnings via the air interface may also extend beyond the vehicle's on-board communication network to a telematics system, e.g. to a fleet management system, are communicated and there the warnings are displayed remotely.
  • Fig. 1 is a compressed air brake system without electronic air preparation unit, as it is widely used on the priority date of the invention disclosed herein.
  • Fig. 2 is a block diagram of an electronic according to the invention
  • Fig. 3 shows schematically a brake system with the invention
  • Figure 4 shows schematically the integration of air preparation unit and brake system in a telematics system.
  • the compressed air system of a commercial vehicle is very complex with different tasks and functions.
  • a schematic representation of such a known system is shown in Fig. 1.
  • a multi-circuit protection valve 4 is supplied with compressed air with a compressor 1 via a pressure regulator 2 and an air dryer 3.
  • the multi-circuit protection valve distributes the air supplied by the compressor to the various compressed air circuits.
  • Fig. 1 three compressed air circuits are shown.
  • 4 compressed air circuits are present today in a commercial vehicle.
  • the number of compressed air circuits is of minor importance.
  • Each compressed air circuit can have its own pressure tank 5,6,7, but does not have to. It can also be stored in a compressed air tank several compressed air circuits.
  • the various brake circuits of the commercial vehicle are operated with the various compressed air circuits.
  • a parking brake 8 a service brake 9 and an automatic brake force regulator 10 are present in a commercial vehicle.
  • the service brake is divided into at least two separate brake circuits, - front brakes 11 and rear brakes 12 - on.
  • the parking brake is designed as a separate brake circuit.
  • the brake force controller adjusts the braking force as a function of the load state.
  • Fig. 1 are compressed air circuits for pneumatic ancillaries and for the air suspension of the commercial vehicle.
  • Such separate compressed air circuits are common in commercial vehicles, so that usually at least four separate compressed air circuits are installed in a commercial vehicle.
  • the compressed air circuit for the brake circuit, in which the parking brake is located is for safety reasons coupled with the compressed air circuit of the parking brake to Pressure loss to prevent a release of the parking brake.
  • the coupling depends on the constructive and functional contexts of the compressed air system.
  • Other brake circuits, not shown, may be provided for trailers or semitrailers.
  • WABCO and Knorr Bremse have integrated air preparation units that combine the air dryer, the multi-circuit protection valve and a control unit to form a system component. From such a state of the art, the invention disclosed here proceeds.
  • Fig. 2 shows schematically the innovations of the invention.
  • Air dryer 3, multi-circuit protection valve 4 and electronic control unit ECU are combined as system components.
  • the electronic control unit contains at least one microcontroller ⁇ C and a timer.
  • the microcontroller can be flashed with application programs via a flash interface.
  • the electronic control unit has a communication interface, preferably a CAN bus interface for connecting the unit to the communication on-board network of a motor vehicle.
  • the entire system unit has an electrical or electronic temperature sensor 20, with which the ambient temperature can be detected and measured.
  • the control unit is arranged on or in the housing of the air dryer or the multi-circuit protection valve or in the common housing of both compressed air components.
  • Direct control lines can be controlled and operated with an application program in the microprocessor from the control unit from the actuators in air dryer and multi-circuit protection valve.
  • the measured values of the pressure sensors arranged in the air dryer and in particular in the multi-circuit protection valve can be read out via direct measuring lines and processed by application programs in the microprocessor.
  • the temperature sensor can be designed here as an analogue temperature sensor with preamplifier and post-amplifier. In this case, its signal is applied to an analog input of the microprocessor.
  • the temperature sensor can also be designed as a digital temperature sensor. In this case, the temperature value already in the temperature sensor becomes a digital measured value signal converted and placed on a digital input of the microprocessor.
  • the temperature sensor may be arranged in or on the multi-circuit protection valve or in or on the air dryer or in or on the control unit. In particular, the temperature sensor can be integrated on the board of the control unit.
  • the direct connection of the temperature sensor to the microprocessor makes it possible to carry out a monitoring of the brake system together with the measured value recording for the system pressures with the air preparation unit without having to resort to additional control unit or for this would have to be accessed on the communication on-board network of the vehicle.
  • the control unit has an interface 21, with which the microprocessor or the program memory can be flashed.
  • An application program used according to the invention which is flashed is a diagnostic function. During the vehicle standstill, the pressure values of the individual pneumatic circuits are recorded and evaluated at defined intervals in the diagnostic function "Leakage detection in the compressed air system.” The pressure values can be calculated in a temperature-compensated manner together with the measured values of the temperature measurement, making the recorded series of pressure values independent of the ambient temperature and a leakage rate can be determined.
  • Integrated in the control unit is a timer.
  • the object of the timer according to the invention is to wake up the microprocessor of the control unit at the predetermined time intervals during vehicle standstill and to activate the diagnostic function. After the measurement has been completed and the measured value has been evaluated, the timer switches the microprocessor off again. Wake-up and shutdown is done here with the methods known per se for microprocessors and is therefore not discussed separately here. For the same reason, the voltage supply of the control unit and the transducer is not shown here, although this is of course available.
  • the measurement series of temperature-compensated system pressures recorded over time are evaluated with regard to decreasing pressure.
  • known accumulator volume can be with the vehicle stopped from the Pressure drop over time the leakage rate of the individual brake circuits are determined and calculated.
  • control unit also has a communication interface, preferably via a CAN bus interface.
  • the integration of the air preparation unit according to the invention in the brake system of a commercial vehicle and in the communication on-board network is illustrated schematically with Fig. 3.
  • the air preparation unit 3,4, ECU the brake cylinders 12 of the rear axles and the brake cylinders 11 of the front axle of the commercial vehicle are pressurized upon actuation of the brake.
  • the control unit ECU of the air preparation unit according to the invention is connected via its CAN bus interface to the CAN bus of the vehicle and thus can optionally exchange messages with other control units in the communication on-board network.
  • the signal and application module SAM is shown by way of example for further units.
  • the integration of the air preparation unit according to the invention into the communication on-board network of a vehicle also enables further functionalities.
  • One of them is shown in Fig. 4.
  • telematics platforms 41 are frequently integrated into the vehicle communication network. These telematics platforms enable remote access to the on-board network of the vehicle from a stationary computer system 42 via an air interface 40. This allows Telediagnoseap bearingio ⁇ en to take on the electrical system and also on the air preparation unit communication access.
  • the vehicle in which the air preparation unit according to the invention is installed belongs to a vehicle fleet which is managed and controlled by a fleet management system.
  • the fleet management system can query the system data of the brake system or, if the diagnostic function in the air preparation unit during a vehicle standstill has detected an intolerable leakage rate, the diagnostic function can transmit a corresponding error message and warning to the fleet management system.

Abstract

L'invention concerne un système de freinage et une unité électronique de traitement d'air pour des systèmes de freinage à air comprimé, notamment dans des véhicules utilitaires. Ces unités sont appelées dans le langage spécialisé E-APU (Electronic Air Processing Unit). Elles sont habituellement composées d'un sécheur d'air, d'une vanne de protection à plusieurs circuits et d'un appareil de commande. L'invention ajoute à ces unités de traitement d'air un temporisateur, un capteur de température et une fonction de diagnostic. L'invention concerne également un système de freinage équipé de la nouvelle unité de traitement d'air.
PCT/EP2008/006146 2007-09-28 2008-07-25 Système de freinage et unité électronique de traitement d'air pour des systèmes de freinage à air comprimé avec temporisateur et capteur de température intégrés WO2009043405A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007046462.4 2007-09-28
DE200710046462 DE102007046462A1 (de) 2007-09-28 2007-09-28 Bremssystem und elektronische Luftaufbereitungseinheit für Druckluftbremssysteme mit integriertem Timer und Temperatursensor

Publications (1)

Publication Number Publication Date
WO2009043405A1 true WO2009043405A1 (fr) 2009-04-09

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PCT/EP2008/006146 WO2009043405A1 (fr) 2007-09-28 2008-07-25 Système de freinage et unité électronique de traitement d'air pour des systèmes de freinage à air comprimé avec temporisateur et capteur de température intégrés

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DE (1) DE102007046462A1 (fr)
WO (1) WO2009043405A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10883482B2 (en) 2012-09-12 2021-01-05 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Compressed air system for a motor vehicle
EP3515775B1 (fr) 2016-09-21 2021-04-07 KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH Système d'air comprimé pour un véhicule et méthode pour l'utilisation d'un système d'air comprimé d'un véhicule

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2492118B1 (fr) * 2011-02-25 2017-12-13 WABCO GmbH Procédé de fonctionnement d'une installation de traitement de l'air comprimé dans un véhicule, installation de traitement de l'air comprimé dotée d'un tel procédé, véhicule doté d'une telle installation de traitement de l'air comprimé et produit de programme informatique
CN104340201B (zh) * 2013-08-09 2017-08-04 北汽福田汽车股份有限公司 一种检测空气压缩机至空气干燥器管路的方法
DE102016012798B4 (de) 2016-10-26 2023-09-21 Florian Brokhausen Verfahren zur Dichtigkeitsprüfung eines Druckluftsystems eines Kraftfahrzeuges während einer Fahrzeugproduktion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477519A1 (fr) * 1990-09-26 1992-04-01 Robert Bosch Gmbh Système de freinage électropneumatique
WO1994007729A1 (fr) * 1992-10-02 1994-04-14 Statens Järnvägar Systeme pour tester des freins
EP1288095A2 (fr) * 2001-08-31 2003-03-05 Günther Dipl.-Ing.(TU) Winkle Diagnostic de freinage pour véhicules ferroviaires et routiers
EP1731335A1 (fr) * 2005-06-08 2006-12-13 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Dispositif de distribution d'air comprimé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477519A1 (fr) * 1990-09-26 1992-04-01 Robert Bosch Gmbh Système de freinage électropneumatique
WO1994007729A1 (fr) * 1992-10-02 1994-04-14 Statens Järnvägar Systeme pour tester des freins
EP1288095A2 (fr) * 2001-08-31 2003-03-05 Günther Dipl.-Ing.(TU) Winkle Diagnostic de freinage pour véhicules ferroviaires et routiers
EP1731335A1 (fr) * 2005-06-08 2006-12-13 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Dispositif de distribution d'air comprimé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10883482B2 (en) 2012-09-12 2021-01-05 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Compressed air system for a motor vehicle
EP3515775B1 (fr) 2016-09-21 2021-04-07 KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH Système d'air comprimé pour un véhicule et méthode pour l'utilisation d'un système d'air comprimé d'un véhicule
EP3515775B2 (fr) † 2016-09-21 2024-04-17 KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH Système d'air comprimé pour un véhicule et méthode pour l'utilisation d'un système d'air comprimé d'un véhicule

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Publication number Publication date
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