WO2020057972A1 - Procédé de transmission de signaux de capteur provenant de capteurs d'un frein de véhicule et frein de véhicule pourvu d'un ensemble de capteurs - Google Patents

Procédé de transmission de signaux de capteur provenant de capteurs d'un frein de véhicule et frein de véhicule pourvu d'un ensemble de capteurs Download PDF

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Publication number
WO2020057972A1
WO2020057972A1 PCT/EP2019/073533 EP2019073533W WO2020057972A1 WO 2020057972 A1 WO2020057972 A1 WO 2020057972A1 EP 2019073533 W EP2019073533 W EP 2019073533W WO 2020057972 A1 WO2020057972 A1 WO 2020057972A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
sensors
signal
output
vehicle brake
Prior art date
Application number
PCT/EP2019/073533
Other languages
German (de)
English (en)
Inventor
Alexander Fuchs
Bence SZEMES
Tamas KONYA
Original Assignee
Knorr-Bremse Systeme für Nutzfahrzeuge 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 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH filed Critical Knorr-Bremse Systeme für Nutzfahrzeuge GmbH
Publication of WO2020057972A1 publication Critical patent/WO2020057972A1/fr

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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/321—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
    • B60T8/3295—Systems in which there is a pulsating signal superposed on the command signal
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W2050/0001—Details of the control system
    • B60W2050/0043—Signal treatments, identification of variables or parameters, parameter estimation or state estimation
    • B60W2050/0058—Signal modulation for data transmission

Definitions

  • the invention relates to a method for transmitting sensor signals from
  • the invention further relates to a vehicle brake with a sensor arrangement with at least two sensors.
  • Brakes in commercial vehicles often have a wear sensor that outputs a wear value for the brake pads of the brake.
  • the signal can be a continuous, usually analog signal, a measured one
  • a standardized analog signal line is usually used to transmit the recorded wear values to a higher-level vehicle electronics.
  • This analog signal line is standardized e.g. with regard to the voltage range within which the signals emitted by the sensors lie.
  • Wear of each brake can be signaled, but no information is available on the higher-level vehicle electronics which of the brakes is worn down to the maximum degree of wear.
  • several such can be discreet working sensors can be connected to a common signal line. In the case of continuously operating sensors, such a connection of the sensors on a signal line is not possible in this way.
  • a method according to the invention of the type mentioned at the outset has the following steps: a first sensor signal from a first of the sensors is provided at a signal output in a first transmission section and then a second sensor signal from a second of the sensors at the signal output in a second transmission section.
  • the sensor signals are thus transmitted in succession in a time-division multiplexing process over one and the same signal line. In this way, the signals of several sensors can be transmitted via a standard signal line.
  • each transmission section is preceded by an identification section in which an identification signal is output at the signal output which is suitable for identifying the sensor whose sensor signal is subsequently output.
  • an identification signal is preferably at least temporarily outside a voltage range which is defined for the sensor signals.
  • Identification signal can have, for example, a predetermined voltage in the identification section, on the basis of which the assignment takes place.
  • the use of voltages that lie outside the (output) voltage range that is defined for the sensors allows the identification signal to be clearly identified and prevents it from being confused with a sensor signal.
  • one comprises
  • Transmission sequence the successive provision of a predetermined number of transmission sections and identification sections.
  • One is preferred
  • Transmission sequence is started when at least one of the sensor signals meets a predetermined criterion. In this way, event-related transmission of the signals can be initiated. As an alternative or in addition, provision can also be made for a transmission sequence to be external, for example from the central vehicle electronics is requested. Alternatively, a permanent repetition of the
  • Transmission sequence e.g. at predetermined intervals.
  • a transmission sequence for at least one of the
  • Transmission sections can be specified for a fixed period of time. Different time periods can be specified for different transmission sections.
  • the sensor arrangement has a microcontroller which is connected to control inputs of the multiplexer
  • Control is coupled.
  • the required control of the multiplexers for implementing the time structure can be flexibly implemented via a microcontroller.
  • At least one input of the microcontroller is connected to at least one of the outputs of the sensors.
  • the microcontroller is preferably set up to monitor the at least one of the outputs in order to start a transmission sequence of sensor signals of at least two sensors.
  • Microcontrollers are used to start a transmission sequence event-controlled depending on one or more of the signals.
  • Fig. 1 a is a schematic plan view of a brake of a vehicle with a
  • 1 b shows a block diagram of a sensor arrangement; and 2, 3 each show a schematic representation of a time dependence of
  • FIG. 1 a schematically shows a vehicle brake 1, in particular one
  • brake 1 Commercial vehicle brake, which is also referred to below simply as brake 1.
  • the brake 1 has a brake caliper 3 which is floatingly supported on a brake carrier 2.
  • An actuator 4 is arranged on the brake caliper 3; a pneumatic actuator is shown by way of example.
  • the brake 1 shown is a disc brake which acts on a brake disc 6 with two brake pads 5.
  • One of the brake pads 5, in Fig. 1 a that shown on the left side, is firmly positioned in the brake caliper 3, whereas the other brake pad 5, which is shown on the right side in Fig. 1 a, by the actuator 4 against the brake disc 6 is pressed.
  • the basic principle of a brake with sensor unit described in this application can be transferred to types of brakes other than those shown and also to brakes with pneumatic actuators 4 other than those shown.
  • the brake 1 is equipped with a sensor arrangement 10 which comprises at least two sensors with which physical parameters in the area of the brake 1 are detected. 1 b, the sensor arrangement 10 is shown in more detail in the form of a block diagram.
  • the sensor arrangement 10 comprises three sensors 11, 12, 13. These sensors can, for example, be force sensors with which the application of the brake 1 and thus the correct function of the actuator 4 can be monitored. Furthermore, one or more of the sensors 11 -13 can be wear sensors which detect a degree of wear of one or both brake linings 5. Furthermore, one of the sensors 11 -13 can be a temperature sensor, for example, in order to determine a temperature, for example of the brake caliper 3 or of a brake lining 5.
  • the number of three sensors in the sensor arrangement 10 shown in FIG. 1 b is purely exemplary. According to the application, at least two sensors are provided, but the number of sensors can also be greater than the three sensors shown.
  • the sensors 11-13 each have an output 111, 121 or 131, at which an output signal of the respective sensor 11 -13 is output as an analog voltage signal within a predetermined voltage range.
  • the outputs 111, 121, 131 of the sensors 11 -13 are coupled to inputs 142 of a multiplexer 14.
  • An output of the multiplexer 14, which can be selectively controlled connected to one of the inputs, also represents the signal output 141 of the sensor arrangement 10.
  • the multiplexer 14 is controlled via control inputs 143, via which it is selected which of the inputs 142 is forwarded to the signal output 141.
  • the inputs 143 are controlled via switching outputs 151 of a microcontroller 15.
  • the microcontroller 15 further comprises inputs 152, these are preferred
  • Analog inputs that are connected to at least one output 111-113 of at least one sensor 11-13.
  • the microcontroller 15 has three inputs 152, one of the inputs 152 being connected to one of the sensors 11-13. It is also conceivable that only one of the sensors 11-13 is then coupled to the microcontroller 15 via only one input 152.
  • an output, in the present case an analog output 153, of the microcontroller 15 is connected to a further one of the inputs 142 of the multiplexer 14.
  • a signal generated by the microcontroller 15 can be output on the signal output 141 via the analog output 153 and the assigned input 142.
  • the mode of operation of the sensor arrangement 10 is explained in FIGS. 2 and 3 for two different configurations of the sensor arrangement 10 on the basis of exemplary signal profiles of output signals from the sensors 11-13.
  • a transmission of several sensor signals 112, 122, 132 of the sensors 11 -13 is achieved in that the outputs 111, 121, 131 of the sensors 11 -13 are successively during a transmission sequence 22 (see FIG. 2) with the aid of the
  • Multiplexers 14 placed on the analog output 141 of the sensor device 10 become. With a transmission via a standardized analog signal line, it can be achieved that the analog output signals 112, 122, 132 of the plurality of sensors 11 -13 can be transmitted.
  • a time dependence of the sensor signals 112, 122, 132, which are present at the outputs 111, 121, 131 of the sensors 11-13, is shown in the form of a diagram.
  • the sensor signals 112, 122, 132 are represented by differently dotted or dashed curves in the diagram.
  • a respective output voltage U is likewise indicated in arbitrary units on the vertical axis. in the
  • a predetermined voltage range 21 is also shown in the diagram, within which the sensor signals are expected. The appearance of a
  • Output voltage of a sensor 11 -13 or also the sensor arrangement 10 is interpreted by a receiving unit as an error signal or as a control signal.
  • the curve profiles of the sensor signals 112, 122, 132 shown in the diagram are purely exemplary.
  • the first sensor 11 is a force sensor, which detects an application force of the actuator 4.
  • the second sensor 2 can be a wear sensor, for example, and the third sensor 3 can measure a temperature.
  • a transmission sequence is started when a significant increase in the signal 112 of the first sensor 11 is observed.
  • the multiplexer 14 is controlled by the microcontroller 15 such that the sensor signal 112 of the first sensor 11 is present at the output 141.
  • One at exit 141 is a transmission sequence started when a significant increase in the signal 112 of the first sensor 11 is observed.
  • Output signal 142 is highlighted in FIG. 2 by a solid line.
  • the solid line is therefore initially congruent with the dotted curve of the sensor signal 112 of the first sensor 11.
  • the time range in which the sensor signal 112 of the first sensor 11 is output is identified in FIG. 2 as the first transmission section 113.
  • the brake 1 is actuated within this transmission section 113, which is reflected in the steep rise in the sensor signal 112 shown Sensor 11 and thus also reflected in the output signal 142. This increase is detected by the microcontroller 15 via the corresponding input 152, whereupon the transmission sequence 22 is started at a start time ts.
  • a changing signal from one of the other sensors can also function as the start signal (trigger). It is also conceivable to request a transmission sequence 22 externally, for example via a separate control line or by applying a certain potential to the output 141 of the multiplexer, this signal being able to be detected accordingly via a further input of the microcontroller 15.
  • the multiplexer 14 is to be structurally designed such that it tolerates the application of a specific voltage signal to its output 141 without damage.
  • the signal 112 of the first sensor 11 is still present at the output 141 for a predefined time.
  • an identification section which announces that the multiplexer 14 now switches the output 141 to the sensor signal 122 of the second sensor 12.
  • the identification section is referred to below as the second identification section 124 because it is upstream of a second transmission section 123. In this second transmission section 123, the output 141 accordingly
  • the period for which this happens can be set individually and does not have to correspond to the period of time that the first transmission section 113 continues after the
  • the third identification section 134 which announces a following third transmission section 133, in which the
  • Identification section which is called the first identification section 114 and which is connected upstream of a further first transmission section 113, in which - again at the beginning - the sensor signal 112 of the first sensor 11 is output.
  • the transmission sequence 22 ends when the first sensor signal 112 is transmitted again at a time te.
  • the identification sections 114, 124, 134 thus ensure that the output signal 141 on the receiver side, e.g. in a central
  • a voltage outside the predetermined voltage range 21 is assumed within an identification section 114, 124, 134, so that the signal in the identification sections 114, 124, 134 can be distinguished from a sensor signal. It is noted that other voltage sequences within an identification section 114, 124, 134 for
  • Identification can be used.
  • a pulse sequence can be transmitted within the identification sections 114, 124, 134, in which the number of the sensor to be subsequently transmitted is coded.
  • the fleas of the voltage within the respective identification section 114, 124, 134 are used for identification.
  • the signal can be generated in the identification sections 114, 124, 134 e.g. by the microcontroller 15 at its analog output 153.
  • the multiplexer 14 the signal is then switched to the signal output 141 in the identification sections 114, 124, 134.
  • FIG. 3 shows another example of a time profile of sensor signals 112, 122 and output signal 142 in the same way as FIG. 2. Reference is hereby made to the description of FIG. 2 and the underlying arrangement according to FIGS. 1 and 1b.
  • the sensor arrangement 10 is designed for three sensors 11-13, as shown in FIG. 1b, but is only equipped with two sensors 11 and 12. For this reason, within the transmission sequence 22, in the third transmission section 133, in which the signal 132 is agreed and as expected of the third sensor 13 would be transmitted, a signal is faded in, which changes in rapid succession between voltage values below and above the predetermined voltage range 21 and which is accordingly identified by a receiving unit as an impermissible signal.
  • the signal is generated by the sensor arrangement 10 in the microcontroller 15 and is input into the multiplexer 14 instead of the signal 131 of the sensor 13 via the corresponding connection 152 of the microcontroller.
  • the inputs 152 of the microcontroller 15 described in connection with FIG. 1b are designed bidirectionally and can also be used as outputs by the microcontroller 15.
  • the microcontroller 15 can detect the missing signal 131 of the sensor 13 not present in an initialization phase and generate the error signal visible in FIG. 3.
  • Microcontrollers 15 are used to output the signal mentioned, which signals a sensor that is not present, and to switch it to the signal output 141 via the multiplexer 14.

Abstract

L'invention concerne un procédé de transmission de signaux de capteur (112, 122, 132) provenant d'au moins deux capteurs (11-13) d'un frein de véhicule (1). Le procédé comprend les étapes suivantes : un premier signal de capteur (112) provenant d'un premier capteur (11-13) est délivré à une sortie de signal (141) dans une première section de transmission (113), puis un deuxième signal de capteur (122) provenant d'un deuxième capteur (11-13) est délivré à la sortie de signal (141) dans une deuxième section de transmission (123). L'invention concerne en outre un frein de véhicule (1) comprenant un ensemble de capteurs (10) comprenant au moins deux capteurs (11-13). L'invention est caractérisée en ce que des sorties (111, 121, 131) des capteurs (11-13) sont reliées à des entrées (142) d'un multiplexeur (14) par l'intermédiaire duquel elles peuvent être reliées successivement à une sortie de signal (141) de l'ensemble de capteurs (10).
PCT/EP2019/073533 2018-09-18 2019-09-04 Procédé de transmission de signaux de capteur provenant de capteurs d'un frein de véhicule et frein de véhicule pourvu d'un ensemble de capteurs WO2020057972A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018122881.3A DE102018122881A1 (de) 2018-09-18 2018-09-18 Verfahren zum Übertragen von Sensorsignalen von Sensoren einer Fahrzeugbremse und Fahrzeugbremse mit Sensoranordnung mit mindestens zwei Sensoren
DE102018122881.3 2018-09-18

Publications (1)

Publication Number Publication Date
WO2020057972A1 true WO2020057972A1 (fr) 2020-03-26

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Application Number Title Priority Date Filing Date
PCT/EP2019/073533 WO2020057972A1 (fr) 2018-09-18 2019-09-04 Procédé de transmission de signaux de capteur provenant de capteurs d'un frein de véhicule et frein de véhicule pourvu d'un ensemble de capteurs

Country Status (2)

Country Link
DE (1) DE102018122881A1 (fr)
WO (1) WO2020057972A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6687644B1 (en) * 1996-12-07 2004-02-03 Continental Teves Ag & Co., Ohg Method and circuit for transmitting information on rotational speed and additional data
US20050046584A1 (en) * 1992-05-05 2005-03-03 Breed David S. Asset system control arrangement and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29917651U1 (de) * 1999-10-07 2000-11-09 Siemens Ag Meßumformer sowie Prozeßleitsystem
DE10036109C2 (de) * 2000-07-25 2003-05-08 Wabco Perrot Bremsen Gmbh Überwachungsvorrichtung für eine Sattelscheibenbremse
EP1657393B1 (fr) * 2004-11-12 2014-03-19 Hawa Ag Dispositif avec des éléments de cloison de séparation contrôlable et procédé de commande
DE102014114316A1 (de) * 2014-10-01 2016-04-07 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Vorrichtung zum Senden und Empfangen eines Sensorsignals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050046584A1 (en) * 1992-05-05 2005-03-03 Breed David S. Asset system control arrangement and method
US6687644B1 (en) * 1996-12-07 2004-02-03 Continental Teves Ag & Co., Ohg Method and circuit for transmitting information on rotational speed and additional data

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