WO2020126300A1 - Method for detecting the position of a wiper blade arm and device for implementing the method - Google Patents

Method for detecting the position of a wiper blade arm and device for implementing the method Download PDF

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Publication number
WO2020126300A1
WO2020126300A1 PCT/EP2019/082149 EP2019082149W WO2020126300A1 WO 2020126300 A1 WO2020126300 A1 WO 2020126300A1 EP 2019082149 W EP2019082149 W EP 2019082149W WO 2020126300 A1 WO2020126300 A1 WO 2020126300A1
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WO
WIPO (PCT)
Prior art keywords
wiper blade
arm
sensor
magnetic field
heating wire
Prior art date
Application number
PCT/EP2019/082149
Other languages
French (fr)
Inventor
Véronique AUTRET
Thierry Cheng
Original Assignee
Valeo Systèmes d'Essuyage
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Filing date
Publication date
Application filed by Valeo Systèmes d'Essuyage filed Critical Valeo Systèmes d'Essuyage
Publication of WO2020126300A1 publication Critical patent/WO2020126300A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/0491—Additional elements being fixed on wipers or parts of wipers not otherwise provided for, e.g. covers, antennae or lights
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/56—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens
    • B60S1/58—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens for rear windows
    • B60S1/583—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens for rear windows including wiping devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/56—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens
    • B60S1/58—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens for rear windows
    • B60S1/586—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens for rear windows including defroster or demisting means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/24419—Interpolation not coverd by groups G01D5/24404, G01D5/24409 or G01D5/24414
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders

Definitions

  • the field of the present invention relates to a method for detecting a position of a wiper blade arm and a device for implementing the method.
  • the invention finds an application for example in the field of wiping systems for motor vehicles and more particularly for the rear windows / glasses of these vehicles.
  • a washing liquid is generally sprayed onto the window and then the wiper blade is operated to remove the dirt which has, for example, accumulated on the window.
  • wiper blades are known, for example, which are fitted with nozzles for spraying the washing liquid.
  • nozzles for spraying the washing liquid.
  • the projection nozzle for the rear window is generally fixed to the chassis of the car. If the driver controls the projection of the liquid, then the wiper blade often starts and scrapes first on a dirty and dry window which can quickly damage the blade and shorten its life. . In addition, the driver often projects liquid continuously onto the window, which consumes washing liquid.
  • the electric motors for the wiping systems of a rear window are generally of simple construction and less expensive than those for the windshield and do not allow the precise position of the wiper blade on the window to be known.
  • the wiper system of the rear window has at its drive unit only extreme positions called stop-fixed position and opposite stop-fixed position and parking.
  • these positions do not allow the intermediate positions to be determined with sufficient precision to be able to launch a specific operation such as for example the spraying of a washing or defrosting liquid.
  • the present invention therefore aims to provide a method for detecting a position of a simple wiper blade arm which is independent of the drive system of the wiper blade, in particular independent of the motor.
  • the present invention relates to a method for detecting a position of a wiper blade arm on a window fitted with at least one heating wire, in which:
  • the magnetic field emitted by the heating wire is detected by a sensor mounted on the wiper blade or the wiper blade arm when the sensor passes during the back-and-forth movement at a portion of the wire heating, and
  • the method may further include one or more of the following characteristics taken alone or in combination.
  • the magnetic field is detected as a function of time and the amplitude maxima of the magnetic field measurement signals are detected, a maximum corresponding to a position of the wiper blade arm where the sensor is located. vis-à-vis a portion of the heating wire.
  • the correspondence between the position of the wiper arm on the window and each maximum magnetic field amplitude is stored in a memory.
  • the position of the wiper blade arm is interpolated between two amplitude maxima (Mi, Mi +/- i ) detected from the magnetic field.
  • the first and second derivative as a function of time can be calculated from the positions detected to deduce the speed of movement of the wiper blade and the acceleration thereof, respectively.
  • the sensor can be mounted at the free end of the wiper blade arm or the wiper blade.
  • the magnetic field sensor is for example a Hall effect sensor.
  • the invention also relates to a method for cleaning a window of a motor vehicle, equipped with at least one heating wire and a wiper blade, comprising the following steps:
  • washing liquid is sprayed onto the window when the wiper blade arm reaches a predetermined position.
  • the invention also relates to a device for detecting a position of a wiper blade arm on a window fitted with at least one heating wire, comprising:
  • control unit configured to supply said heating wire with an electric current
  • a magnetic field sensor mounted on the wiper blade or wiper arm configured to measure a magnetic field emitted by the heating wire when the sensor passes during the back-and-forth movement at a portion heating wire
  • a processing unit configured to deduce a position of the wiper arm from the detected magnetic field.
  • the processing unit is configured to detect the amplitude maxima of the magnetic field measurement signals, a maximum corresponding to a position of the wiper blade arm where the sensor is located opposite -vis a portion of the heating wire.
  • the processing unit may include a memory in which the correspondence between the position of the wiper arm on the window and each maximum magnetic field amplitude is recorded.
  • the processing unit can also be configured to interpolate the position of the wiper blade arm between two detected maximum amplitudes of the magnetic field.
  • the senor is mounted at the free end of the wiper blade arm.
  • the sensor is for example a Hall effect sensor.
  • the invention also relates to a wiper blade arm for a device as described above, characterized in that it comprises a Hall effect sensor fixed to one face of the wiper blade arm intended to be opposite the glass to be wiped.
  • Figure 1 schematically shows in an upper part a rear window of a vehicle equipped with a heating of the window as well as several positions of a wiper blade provided with a sensor for measuring a magnetic field and in a lower part a diagram showing sensor measurement signals as a function of the angular position of the wiper blade arm on the window,
  • FIG. 2 shows a block diagram of an exemplary embodiment of a device for detecting a position of a wiper blade arm according to the invention
  • FIG. 3 shows a flow diagram of an exemplary embodiment of the method for detecting a position of a wiper blade arm according to the invention.
  • the reference number designates the element or elements in general and the index indicates an individual element.
  • the heating wire can be designated generally with the reference number 5 and an individual heating wire for example by the same reference followed by a letter or an indicates as 5a.
  • Figure 1 shows in its upper part a rear window 1 of a motor vehicle (not shown) equipped with a heating 3 of the window 1 in particular to defrost the latter in the event that ice or frost obscures the vision of a driver of the vehicle through the window 1.
  • the heating 3 of the window is for example formed by at least one heating wire 5 which heats up by Joule effect when it is traversed by an electric current.
  • the heater 3 of the rear window 1 comprises two end electrodes 7 and 9 connected to nine parallel heating wires 5a to 5i integrated on or in the window 1. When the end electrodes 7 and 9 are connected to a power supply of the motor vehicle, each heating wire 5a to 5i is traversed by an electric current and heats the window 1 by the Joule effect.
  • the heating wires 5 can be made of metal or any other material suitable for heating the rear window 1.
  • the heating wires 5 can be opaque and visible, even if they have a very fine diameter or else be made from an electrically conductive and transparent material.
  • the present invention can also be applied to a windshield, in particular when the heating wires 5 are made of transparent conductive material.
  • the rear window 5 is equipped with a wiper blade 1 1 mounted on a wiper blade arm 13 which is connected via an axis (not visible) to an electric motor (not -visible) to be able to move back and forth between a fixed stop position of the brush arm 13 designated by an arrow B and an opposite fixed stop position designated by an arrow F passing through intermediate positions C, D,
  • the parking or rest position is designated by an arrow A.
  • the same brush 1 1 and the same brush arm 13 are represented in the five positions B to E.
  • the rear window 1 is further equipped with a detection device 15 (see FIG. 2) of a position of a wiper blade arm 13.
  • This detection device 15 comprises:
  • control unit 17 configured to supply said heating wire 5 with an electric current
  • a magnetic field sensor 19 mounted on the wiper blade 11 or the wiper blade arm 13 configured to measure the magnetic field emitted by the wire heating 5 when the sensor 19 passes during the back-and-forth movement at a portion of the heating wire 5, and
  • a processing unit 21 configured to deduce a position of the wiper blade arm from the detected magnetic field.
  • the control unit 17 is for example a relay connected to the defrosting system of the motor vehicle to supply the heating wires 5 via the end electrodes 7 and 9.
  • the heating wires 5 are only supplied when the we need to know the position of the mop arm 13, for example in the context of a process for cleaning the rear window 1 to spray a washing liquid at the right time relative to the position of the mop arm 13, c '' i.e. just before the passage of the wiper blade 1 1.
  • the magnetic field sensor 19 is carried by the free end 23 of the wiper arm 13, opposite the pivot axis, and more specifically by one face of the wiper blade arm 13 intended to be vis-à-vis the glass 1 to wipe.
  • the magnetic field sensor 19 is carried by the free end of the wiper blade 11 opposite to the pivot / rotation axis of the wiper blade.
  • the magnetic field sensor 19 is arranged on the blade arm 13 or the wiper blade 1 1 so that during a back and forth movement on the window, the sensor 19 is successively opposite a portion of the heating wire (s) 5.
  • each heating wire 5 By being traversed by an electric current, each heating wire 5 also emits a magnetic field which has a local maximum when the sensor 19 passes during the back-and-forth movement at a portion of the heating wire 5 and is opposite it.
  • the sensor 19 is for example a Hall effect sensor. It can be connected by a wired link for example to the processing unit 21. According to another embodiment, the sensor 19 can be a stand-alone sensor, that is to say one having its own power supply and communicating by radio signal with the processing unit. To do this, such a stand-alone sensor includes a rechargeable battery or a capacity as well as a generator. of electricity from the movements of the brush arm 13. According to another embodiment, the sensor 19 draws its electrical energy by induction from the magnetic field emitted by the heating wires 5.
  • FIG. 1 presents a diagram showing measurement signals 24 of the sensor 19 as a function of the angular position of the wiper arm 13 on the rear window 1.
  • the signal has a characteristic shape which makes it possible to deduce the position of the brush arm 13 as well as other characteristics of its movement (speed, acceleration).
  • the processing unit 21 is configured to detect the maximum amplitudes of the measurement signal of the magnetic field emitted by the heating wires 5, for example by a detection of crossing a threshold or by a derivative electronic circuit.
  • each local maximum M1 to M7 corresponds to a specific angular position, respectively A to F of the wiper blade arm 13 where the sensor is located opposite a portion of the heating wire.
  • the processing unit 21 may further comprise a memory 25 in which the correspondence between the position of the brush arm of the machine is recorded.
  • windshield wiper on the glass and each maximum amplitude of magnetic field for example in the form of a table.
  • the processing unit 21 can be configured to interpolate the position of the wiper blade arm 13. In a first approximation, it may be a linear interpolation or a more sophisticated interpolation taking into account the speed and acceleration of the brush arm 13 in the different positions.
  • said heating wire 5 is supplied with an electric current.
  • the wiper blade is moved in a back and forth movement on the window 1.
  • Steps 101 and 103 do not necessarily have to be performed in this order, but they can also be reversed. It is only important that the heating wires 5 are supplied with current in order to be able to detect the magnetic field emitted.
  • step 105 the magnetic field emitted by the heating wire 5 is detected by the sensor 19 and a position of the wiper blade arm 13 from the field is deduced during step 107. magnetic detected.
  • the measurements are taken as a function of time, for example, and the amplitude maxima of the measured magnetic field are detected.
  • the detection of a local maximum can be achieved by crossing a threshold, for example with a Schmitt trigger or simply by a suitable electronic diverter circuit.
  • Each of these maxima M1 to M7 corresponds to an angular position of the wiper blade arm where the sensor 19 is located opposite a portion of the heating wire 5.
  • the correspondence between the position (for example angular) of the wiper blade arm 13 on the window 1 and each maximum M1 to M7 of the signal is stored in memory 25, for example. magnetic field measurement.
  • the position of the wiper blade arm 13 can be used for a method of cleaning a window of a motor vehicle, in which the movement of the wiper blade 11 is detected according to the method. as described above without the need for data from the drive motor and, in a step 109, for example, the spraying of a washing liquid is triggered on the window 1 when the wiper blade arm 13 reaches a predetermined position suitable for improving the cleaning and / or defrosting of the rear window 1.
  • the present invention allows simple and effective detection of the position of the wiper blade 1 or of the brush arm 13 on the window 1. This detection can in particular be independent of the drive system of the wiper blade.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The present invention relates to a method for detecting the position of a wiper blade arm (13) on a window pane (1) provided with at least one heating wire (5), wherein: the heating wire (5) is supplied with an electric current; the wiper blade (11) is moved back and forth on the window (1); the magnetic field emitted by the heating wire is detected by a sensor (19) mounted on the wiper blade (11) or the wiper blade arm (13) when the sensor (19) moves over a portion of the heating wire (5) during the back-and-forth movement; and the position of the wiper blade arm (13) is deduced from the detected magnetic field.

Description

Description Description
Titre de l’invention : Procédé de détection d’une position d’un bras de balai d’essuie-glace et dispositif de mise en œuvre du procédé Title of the invention: Method for detecting a position of a wiper blade arm and device for implementing the method
Le domaine de la présente invention est relatif à un procédé de détection d’une position d’un bras de balai d’essuie-glace et un dispositif de mise en œuvre du procédé. The field of the present invention relates to a method for detecting a position of a wiper blade arm and a device for implementing the method.
L’invention trouve une application par exemple dans le domaine des systèmes d’essuyage pour véhicules automobiles et plus particulièrement pour les vitres / lunettes arrières de ces véhicules. The invention finds an application for example in the field of wiping systems for motor vehicles and more particularly for the rear windows / glasses of these vehicles.
Pour le lavage des vitres d’un véhicule, on projette généralement un liquide de lavage sur la vitre et puis on fait fonctionner le balai d’essuie-glace pour enlever les saletés qui se sont par exemple accumulées sur la vitre. To wash the windows of a vehicle, a washing liquid is generally sprayed onto the window and then the wiper blade is operated to remove the dirt which has, for example, accumulated on the window.
Ainsi, on obtient un nettoyage efficace de la vitre ce qui est gage de sécurité pour le conducteur. Thus, an effective cleaning of the window is obtained, which is a guarantee of safety for the driver.
Parmi les systèmes d’essuyage pour véhicule automobile, on connaît par exemple des balais d’essuie-glace qui sont équipés de buses de projection du liquide de lavage. Ainsi, on peut par exemple projeter le liquide de lavage juste en amont du balai lorsque celui-ci est en mouvement, ce qui optimise le nettoyage de la vitre. Among the wiping systems for a motor vehicle, wiper blades are known, for example, which are fitted with nozzles for spraying the washing liquid. Thus, it is possible for example to spray the washing liquid just upstream of the brush when the latter is in motion, which optimizes the cleaning of the window.
Toutefois, la buse de projection pour la vitre arrière est généralement fixée sur le châssis de la voiture. Si le conducteur commande la projection du liquide, alors le balai d’essuie-glace se met souvent en marche et racle d’abord sur une vitre sale et sèche ce qui peut abîmer rapidement le balai et réduire la durée de vie de celui-ci. De plus, le conducteur projette souvent du liquide en continue sur la vitre, ce qui est consommateur en liquide de lavage. However, the projection nozzle for the rear window is generally fixed to the chassis of the car. If the driver controls the projection of the liquid, then the wiper blade often starts and scrapes first on a dirty and dry window which can quickly damage the blade and shorten its life. . In addition, the driver often projects liquid continuously onto the window, which consumes washing liquid.
Pour être le plus efficace possible, il convient de projeter le liquide de lavage seulement quand le balai d’essuie-glace se trouve dans une position prédéterminée, de préférence de sorte que la projection du liquide soit réalisée juste en amont du balai. Pour ce faire, il est donc nécessaire de connaître la position du balai d’essuie-glace afin de pouvoir synchroniser la projection du liquide de lavage avec le mouvement de va- et-vient du balai d’essuie-glace sur la vitre. To be as effective as possible, it is advisable to spray the washing liquid only when the wiper blade is in a predetermined position, preferably so that the projection of the liquid is carried out just upstream of the brush. To do this, it is therefore necessary to know the position of the wiper blade in order to be able to synchronize the projection of the washing liquid with the reciprocating movement of the wiper blade on the window.
Les moteurs électriques des systèmes d’essuyage d’une vitre arrière sont généralement de construction simple et moins cher que ceux pour le pare-brise et ne permettent pas de connaître la position précise du balai d’essuie-glace sur la vitre. The electric motors for the wiping systems of a rear window are generally of simple construction and less expensive than those for the windshield and do not allow the precise position of the wiper blade on the window to be known.
Ainsi, le système d’essuyage de la vitre arrière dispose au niveau de son unité d’entrainement seulement des positions extrémales dénommées position arrêt-fixe et position arrêt-fixe opposé et parking. Thus, the wiper system of the rear window has at its drive unit only extreme positions called stop-fixed position and opposite stop-fixed position and parking.
Toutefois, ces positions ne permettant pas de déterminer de façon assez précise les positions intermédiaires pour pouvoir lancer une opération spécifique comme par exemple la projection d’un liquide de lavage ou de dégivrage. However, these positions do not allow the intermediate positions to be determined with sufficient precision to be able to launch a specific operation such as for example the spraying of a washing or defrosting liquid.
La présente invention a donc pour objet de proposer un procédé de détection d’une position d’un bras de balai d’essuie-glace simple et qui est indépendant du système d’entraînement du balai d’essuie-glace, notamment indépendant du moteur The present invention therefore aims to provide a method for detecting a position of a simple wiper blade arm which is independent of the drive system of the wiper blade, in particular independent of the motor.
d’entraînement. training.
A cet effet, la présente invention concerne un procédé de détection d’une position d’un bras de balai d’essuie-glace sur une vitre équipée d’au moins un fil de chauffage, dans lequel : To this end, the present invention relates to a method for detecting a position of a wiper blade arm on a window fitted with at least one heating wire, in which:
on alimente ledit fil de chauffage avec un courant électrique, on déplace le balai d’essuie-glace selon un mouvement de va-et-vient sur la vitre, we feed said heating wire with an electric current, we move the wiper blade in a back and forth movement on the glass,
on détecte par un capteur monté sur le balai ou le bras de balai d’essuie- glace le champ magnétique émis par le fil de chauffage lorsque le capteur passe au cours du mouvement de va-et-vient au niveau d’une portion du fil de chauffage, et the magnetic field emitted by the heating wire is detected by a sensor mounted on the wiper blade or the wiper blade arm when the sensor passes during the back-and-forth movement at a portion of the wire heating, and
on déduit une position du bras de balai d’essuie-glace à partir du champ magnétique détecté. we deduce a position of the wiper blade arm from the detected magnetic field.
Le procédé peut en outre comporter une ou plusieurs des caractéristiques suivantes prises seules ou en combinaison. Selon un aspect, on détecte le champ magnétique en fonction du temps et on détecte les maxima d’amplitude des signaux de mesure du champ magnétique, un maximum correspondant à une position du bras de balai d’essuie-glace où le capteur se trouve en vis-à-vis d’une portion du fil de chauffage. The method may further include one or more of the following characteristics taken alone or in combination. In one aspect, the magnetic field is detected as a function of time and the amplitude maxima of the magnetic field measurement signals are detected, a maximum corresponding to a position of the wiper blade arm where the sensor is located. vis-à-vis a portion of the heating wire.
On mémorise par exemple dans une mémoire la correspondance entre la position du bras de balai d’essuie-glace sur la vitre et chaque maximum d’amplitude de champ magnétique. For example, the correspondence between the position of the wiper arm on the window and each maximum magnetic field amplitude is stored in a memory.
Selon un autre aspect, on interpole la position du bras de balai d’essuie-glace entre deux maxima d’amplitude (Mi, Mi+/-i) détectés du champ magnétique. According to another aspect, the position of the wiper blade arm is interpolated between two amplitude maxima (Mi, Mi +/- i ) detected from the magnetic field.
On peut calculer à partir des positions détectées la dérivée première et seconde en fonction du temps pour en déduire respectivement la vitesse de déplacement du balai d’essuie-glace et l’accélération de celui-ci. The first and second derivative as a function of time can be calculated from the positions detected to deduce the speed of movement of the wiper blade and the acceleration thereof, respectively.
Le capteur peut être monté au niveau de l’extrémité libre du bras de balai d’essuie-glace ou du balai d’essuie-glace. The sensor can be mounted at the free end of the wiper blade arm or the wiper blade.
Le capteur du champ magnétique est par exemple un capteur à effet Hall. The magnetic field sensor is for example a Hall effect sensor.
L’invention concerne également un procédé de nettoyage d’une vitre de véhicule automobile, équipée d’au moins un fil de chauffage et d’un balai d’essuie-glace, comprenant les étapes suivantes : The invention also relates to a method for cleaning a window of a motor vehicle, equipped with at least one heating wire and a wiper blade, comprising the following steps:
- on détecte le déplacement du balai d’essuie-glace selon le procédé décrit ci- dessus, - the displacement of the wiper blade is detected according to the method described above,
- on déclenche la projection d’un liquide de lavage sur la vitre lorsque le bras de balai d’essuie-glace atteint une position prédéterminée. - a washing liquid is sprayed onto the window when the wiper blade arm reaches a predetermined position.
L’invention concerne aussi un dispositif de détection d’une position d’un bras de balai d’essuie-glace sur une vitre équipée d’au moins un fil de chauffage, comprenant : The invention also relates to a device for detecting a position of a wiper blade arm on a window fitted with at least one heating wire, comprising:
une unité de commande configurée pour alimenter ledit fil de chauffage avec un courant électrique, a control unit configured to supply said heating wire with an electric current,
un capteur de champ magnétique monté sur le balai ou le bras de balai d’essuie-glace configuré pour mesurer un champ magnétique émis par le fil de chauffage lorsque le capteur passe au cours du mouvement de va-et-vient au niveau d’une portion du fil de chauffage, a magnetic field sensor mounted on the wiper blade or wiper arm configured to measure a magnetic field emitted by the heating wire when the sensor passes during the back-and-forth movement at a portion heating wire,
une unité de traitement configurée pour déduire une position du bras de balai d’essuie-glace à partir du champ magnétique détecté. a processing unit configured to deduce a position of the wiper arm from the detected magnetic field.
Le dispositif selon l’invention peut en outre comporter une ou plusieurs des caractéristiques suivantes prises seules ou en combinaison : The device according to the invention may also include one or more of the following characteristics taken alone or in combination:
Selon un aspect, l’unité de traitement est configurée pour détecter les maxima d’amplitude des signaux de mesure du champ magnétique, un maximum correspondant à une position du bras de balai d’essuie-glace où le capteur se trouve en vis-à-vis d’une portion du fil de chauffage. According to one aspect, the processing unit is configured to detect the amplitude maxima of the magnetic field measurement signals, a maximum corresponding to a position of the wiper blade arm where the sensor is located opposite -vis a portion of the heating wire.
L’unité de traitement peut comprendre une mémoire dans laquelle est enregistrée la correspondance entre la position du bras de balai d’essuie-glace sur la vitre et chaque maximum d’amplitude de champ magnétique. The processing unit may include a memory in which the correspondence between the position of the wiper arm on the window and each maximum magnetic field amplitude is recorded.
L’unité de traitement peut être en outre configurée pour interpoler la position du bras de balai d’essuie-glace entre deux maxima d’amplitude détectés du champ magnétique. The processing unit can also be configured to interpolate the position of the wiper blade arm between two detected maximum amplitudes of the magnetic field.
Selon un mode de réalisation, le capteur est monté au niveau de l’extrémité libre du bras de balai d’essuie-glace. According to one embodiment, the sensor is mounted at the free end of the wiper blade arm.
Le capteur est par exemple un capteur à effet Hall. The sensor is for example a Hall effect sensor.
L’invention concerne également un bras de balai d’essuie-glace pour un dispositif tel que décrit ci-dessus, caractérisé en ce qu’il comprend un capteur à effet Hall fixé sur une face du bras de balai d’essuie-glace destiné à être en vis-à-vis de la vitre à essuyer. The invention also relates to a wiper blade arm for a device as described above, characterized in that it comprises a Hall effect sensor fixed to one face of the wiper blade arm intended to be opposite the glass to be wiped.
D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante, donnée à titre d'exemple et sans caractère limitatif, en regard des dessins annexés sur lesquels : Other characteristics and advantages of the invention will emerge from the following description, given by way of example and without limitation, with reference to the appended drawings in which:
[Fig. 1] la figure 1 représente dans une partie supérieure de façon schématique une vitre arrière d’un véhicule équipé d’un chauffage de la vitre ainsi que plusieurs positions d’un balai d’essuie-glace muni d’un capteur de mesure d’un champ magnétique et dans une partie inférieure un diagramme montrant des signaux de mesure du capteur en fonction de la position angulaire du bras de balai d’essuie-glace sur la vitre, [Fig. 1] Figure 1 schematically shows in an upper part a rear window of a vehicle equipped with a heating of the window as well as several positions of a wiper blade provided with a sensor for measuring a magnetic field and in a lower part a diagram showing sensor measurement signals as a function of the angular position of the wiper blade arm on the window,
[Fig. 2] la figure 2 montre un diagramme synoptique d’un exemple de réalisation d’un dispositif de détection d’une position d’un bras de balai d’essuie-glace selon l’invention, et [Fig. 2] FIG. 2 shows a block diagram of an exemplary embodiment of a device for detecting a position of a wiper blade arm according to the invention, and
[Fig. 3] la figure 3 montre un organigramme d’un exemple de réalisation du procédé de détection d’une position d’un bras de balai d’essuie-glace selon l’invention. [Fig. 3] FIG. 3 shows a flow diagram of an exemplary embodiment of the method for detecting a position of a wiper blade arm according to the invention.
Sur toutes les figures, les éléments ayant des fonctions identiques portent les mêmes numéros de référence. In all the figures, the elements having identical functions bear the same reference numbers.
Les réalisations suivantes sont des exemples. Bien que la description se réfère à un ou plusieurs modes de réalisation, ceci ne signifie pas nécessairement que chaque référence concerne le même mode de réalisation, ou que les caractéristiques s'appliquent seulement à un seul mode de réalisation. De simples caractéristiques de différents modes de réalisation peuvent également être combinées ou interchangées pour fournir d'autres réalisations. The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the characteristics apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.
Certains éléments portent un numéro de référence avec ou sans indice. Dans ce cas, le numéro de référence désigne l’élément ou les éléments en général et l’indice un élément individuel. Ainsi, le fil de chauffage peut être désigné de façon générale avec le numéro de référence 5 et un fil de chauffage individuel par exemple par la même référence suivi d’une lettre ou d’un indique comme 5a. Certain elements carry a reference number with or without index. In this case, the reference number designates the element or elements in general and the index indicates an individual element. Thus, the heating wire can be designated generally with the reference number 5 and an individual heating wire for example by the same reference followed by a letter or an indicates as 5a.
La figure 1 montre dans sa partie supérieure une vitre arrière 1 d’un véhicule automobile (non représenté) équipée d’un chauffage 3 de la vitre 1 notamment pour dégivrer cette dernière au cas où de la glace ou du givre occulte la vision d’un conducteur du véhicule au travers de la vitre 1. Figure 1 shows in its upper part a rear window 1 of a motor vehicle (not shown) equipped with a heating 3 of the window 1 in particular to defrost the latter in the event that ice or frost obscures the vision of a driver of the vehicle through the window 1.
Dans le présent cas, le chauffage 3 de la vitre est par exemple formé par au moins un fil de chauffage 5 qui s’échauffe par effet Joule lors qu’il est parcouru par un courant électrique. Dans la présente configuration, le chauffage 3 de la vitre arrière 1 comprend deux électrodes d’extrémités 7 et 9 connectées à neuf fils de chauffage 5a à 5i parallèles intégrés sur ou dans la vitre 1 . Lorsque les électrodes d’extrémité 7 et 9 sont connectées à une alimentation électrique du véhicule automobile, chaque fil de chauffage 5a à 5i est parcouru par un courant électrique et chauffe la vitre 1 par effet Joule. In the present case, the heating 3 of the window is for example formed by at least one heating wire 5 which heats up by Joule effect when it is traversed by an electric current. In the present configuration, the heater 3 of the rear window 1 comprises two end electrodes 7 and 9 connected to nine parallel heating wires 5a to 5i integrated on or in the window 1. When the end electrodes 7 and 9 are connected to a power supply of the motor vehicle, each heating wire 5a to 5i is traversed by an electric current and heats the window 1 by the Joule effect.
Bien entendu, selon une réalisation non représentée, on peut aussi avoir un seul fil de chauffage 5 parcourant la vitre arrière 1 en serpentin ou tout autre motif approprié pour permettre de dégivrer cette vitre arrière 1 rapidement et efficacement. Of course, according to an embodiment not shown, it is also possible to have a single heating wire 5 traversing the rear window 1 in a serpentine or any other suitable pattern to allow this rear window 1 to be defrosted quickly and efficiently.
Les fils de chauffage 5 peuvent être en métal ou tout autre matériau adapté pour chauffer la vitre arrière 1 . The heating wires 5 can be made of metal or any other material suitable for heating the rear window 1.
Les fils de chauffage 5 peuvent être opaques et visibles, même s’ils présentent un diamètre très fin ou alors être réalisés dans un matériau électriquement conducteur et transparent. The heating wires 5 can be opaque and visible, even if they have a very fine diameter or else be made from an electrically conductive and transparent material.
Bien entendu, la présente invention peut aussi s’appliquer à un pare-brise, notamment quand les fils de chauffage 5 sont en matériau conducteur transparent. Of course, the present invention can also be applied to a windshield, in particular when the heating wires 5 are made of transparent conductive material.
En position centrale basse, la vitre arrière 5 est équipée d’un balai d’essuie-glace 1 1 monté sur un bras de balai d’essuie-glace 13 qui est relié via un axe (non visible) à un moteur électrique (non-visible) pour pouvoir effectuer un mouvement de va-et-vient entre une position arrêt fixe du bras de balai 13 désignée par une flèche B et une position arrêt fixe opposée désignée par une flèche F en passant par des position intermédiaires C, D,In the lower central position, the rear window 5 is equipped with a wiper blade 1 1 mounted on a wiper blade arm 13 which is connected via an axis (not visible) to an electric motor (not -visible) to be able to move back and forth between a fixed stop position of the brush arm 13 designated by an arrow B and an opposite fixed stop position designated by an arrow F passing through intermediate positions C, D,
E. La position de parking ou de repos est désigné par une flèche A. Sur la figure 1 en position haute, le même balai 1 1 et le même bras de balai 13 sont représentés dans les cinq positions B à E. E. The parking or rest position is designated by an arrow A. In FIG. 1 in the high position, the same brush 1 1 and the same brush arm 13 are represented in the five positions B to E.
Pour pouvoir suivre la positon et le déplacement du balai d’essuie-glace 1 1 et donc aussi du bras de balai 13 associé, la vitre arrière 1 est de plus équipée d’un dispositif de détection 15 (voir figure 2) d’une position d’un bras de balai 13 d’essuie-glace. In order to be able to follow the position and the movement of the wiper blade 11 and therefore also of the associated wiper arm 13, the rear window 1 is further equipped with a detection device 15 (see FIG. 2) of a position of a wiper blade arm 13.
Ce dispositif de détection 15 comprend : This detection device 15 comprises:
une unité 17 de commande configurée pour alimenter ledit fil de chauffage 5 avec un courant électrique, a control unit 17 configured to supply said heating wire 5 with an electric current,
un capteur 19 de champ magnétique monté sur le balai 1 1 ou le bras de balai 13 d’essuie-glace configuré pour mesurer le champ magnétique émis par le fil de chauffage 5 lorsque le capteur 19 passe au cours du mouvement de va-et-vient au niveau d’une portion du fil de chauffage 5, et a magnetic field sensor 19 mounted on the wiper blade 11 or the wiper blade arm 13 configured to measure the magnetic field emitted by the wire heating 5 when the sensor 19 passes during the back-and-forth movement at a portion of the heating wire 5, and
une unité de traitement 21 configurée pour déduire une position du bras de balai d’essuie-glace à partir du champ magnétique détecté. a processing unit 21 configured to deduce a position of the wiper blade arm from the detected magnetic field.
L’unité de commande 17 est par exemple un relais connecté au système de dégivrage du véhicule automobile pour alimenter les fils de chauffage 5 via les électrodes d’extrémité 7 et 9. Bien entendu, on alimente les fils de chauffage 5 seulement lorsque l’on a besoin de connaître la position du bras de balai 13, par exemple dans le cadre d’un procédé de nettoyage de la vitre arrière 1 pour projeter un liquide de lavage au bon moment par rapport à la position du bras de balai 13, c’est-à-dire juste avant le passage du balai d’essuie-glace 1 1. The control unit 17 is for example a relay connected to the defrosting system of the motor vehicle to supply the heating wires 5 via the end electrodes 7 and 9. Of course, the heating wires 5 are only supplied when the we need to know the position of the mop arm 13, for example in the context of a process for cleaning the rear window 1 to spray a washing liquid at the right time relative to the position of the mop arm 13, c '' i.e. just before the passage of the wiper blade 1 1.
Sur la figure 1 , le capteur 19 de champ magnétique est porté par l’extrémité libre 23 du bras de balai 13, opposée à l’axe de pivotement, et plus spécifiquement par une face du bras de balai 13 d’essuie-glace destiné à être en vis-à-vis de la vitre 1 à essuyer. In FIG. 1, the magnetic field sensor 19 is carried by the free end 23 of the wiper arm 13, opposite the pivot axis, and more specifically by one face of the wiper blade arm 13 intended to be vis-à-vis the glass 1 to wipe.
Selon une autre configuration non représentée, le capteur 19 de champ magnétique est porté par l’extrémité libre du balai d’essuie- glace 1 1 opposée à l’axe de pivotement / rotation du balai d’essuie-glace. According to another configuration not shown, the magnetic field sensor 19 is carried by the free end of the wiper blade 11 opposite to the pivot / rotation axis of the wiper blade.
En effet, le capteur 19 de champ magnétique est disposé sur le bras de balai 13 ou le balai d’essuie-glace 1 1 de façon que lors d’un mouvement de va-et-vient sur la vitre, le capteur 19 se trouve successivement en vis-à-vis d’une portion du ou des fils de chauffage 5. Indeed, the magnetic field sensor 19 is arranged on the blade arm 13 or the wiper blade 1 1 so that during a back and forth movement on the window, the sensor 19 is successively opposite a portion of the heating wire (s) 5.
En étant parcouru par un courant électrique, chaque fil de chauffage 5 émet également un champ magnétique qui présente un maximum local lorsque le capteur 19 passe au cours du mouvement de va-et-vient au niveau d’une portion du fil de chauffage 5 et se trouve en vis-à-vis de celui-ci. By being traversed by an electric current, each heating wire 5 also emits a magnetic field which has a local maximum when the sensor 19 passes during the back-and-forth movement at a portion of the heating wire 5 and is opposite it.
Le capteur 19 est par exemple un capteur à effet Hall. Il peut être relié par une liaison filaire par exemple à l’unité de traitement 21. Selon une autre réalisation, le capteur 19 peut être un capteur autonome, c’est-à-dire disposant de sa propre alimentation et communiquant par signal radio avec l’unité de traitement. Pour ce faire, un tel capteur autonome comporte une pile rechargeable ou une capacité ainsi qu’une génératrice d’électricité à partir des mouvements du bras de balai 13. Selon un autre mode de réalisation, le capteur 19 puise son énergie électrique par induction à partir du champ magnétique émis par les fils de chauffage 5. The sensor 19 is for example a Hall effect sensor. It can be connected by a wired link for example to the processing unit 21. According to another embodiment, the sensor 19 can be a stand-alone sensor, that is to say one having its own power supply and communicating by radio signal with the processing unit. To do this, such a stand-alone sensor includes a rechargeable battery or a capacity as well as a generator. of electricity from the movements of the brush arm 13. According to another embodiment, the sensor 19 draws its electrical energy by induction from the magnetic field emitted by the heating wires 5.
La partie inférieure de la figure 1 présente un diagramme montrant des signaux de mesure 24 du capteur 19 en fonction de la position angulaire du bras de balai 13 d’essuie- glace sur la vitre arrière 1 . The lower part of FIG. 1 presents a diagram showing measurement signals 24 of the sensor 19 as a function of the angular position of the wiper arm 13 on the rear window 1.
On y voit que le signal possède une forme caractéristique qui permet de déduire la position du bras de balai 13 ainsi que d’autres caractéristiques de son mouvement (vitesse, accélération). It can be seen that the signal has a characteristic shape which makes it possible to deduce the position of the brush arm 13 as well as other characteristics of its movement (speed, acceleration).
Selon un mode de réalisation, l’unité de traitement 21 est configurée pour détecter les maxima d’amplitude du signal de mesure du champ magnétique émis par les fils de chauffage 5, par exemple par une détection de franchissement d’un seuil ou par un circuit électronique dérivateur. According to one embodiment, the processing unit 21 is configured to detect the maximum amplitudes of the measurement signal of the magnetic field emitted by the heating wires 5, for example by a detection of crossing a threshold or by a derivative electronic circuit.
Comme on peut le voir sur la figure 1 , chaque maximum local M1 à M7 correspond à une position angulaire spécifique, respectivement A à F du bras de balai 13 d’essuie- glace où le capteur se trouve en vis-à-vis d’une portion du fil de chauffage. As can be seen in FIG. 1, each local maximum M1 to M7 corresponds to a specific angular position, respectively A to F of the wiper blade arm 13 where the sensor is located opposite a portion of the heating wire.
Pour obtenir la correspondance entre les signaux de mesure d’une part et la position angulaire d’autre part, l’unité de traitement 21 peut comprendre de plus une mémoire 25 dans laquelle est enregistrée la correspondance entre la position du bras de balai d’essuie-glace sur la vitre et chaque maximum d’amplitude de champ magnétique, par exemple sous la forme d’une table. To obtain the correspondence between the measurement signals on the one hand and the angular position on the other hand, the processing unit 21 may further comprise a memory 25 in which the correspondence between the position of the brush arm of the machine is recorded. windshield wiper on the glass and each maximum amplitude of magnetic field, for example in the form of a table.
Puis, pour accéder aux positions intermédiaires entre les maxima locaux de mesure, l’unité de traitement 21 peut être configurée pour interpoler la position du bras de balai 13 d’essuie-glace. Dans une première approximation, il peut s’agir d’une interpolation linéaire ou alors d’une interpolation plus sophistiquée tenant compte de la vitesse et de l’accélération du bras de balai 13 dans les différentes positions. Then, to access the intermediate positions between the local measurement maxima, the processing unit 21 can be configured to interpolate the position of the wiper blade arm 13. In a first approximation, it may be a linear interpolation or a more sophisticated interpolation taking into account the speed and acceleration of the brush arm 13 in the different positions.
En référence à la figure 3 montrant un organigramme d’un exemple du procédé selon l’invention, on va expliquer le fonctionnement du dispositif de détection 15. Selon une étape 101 , on alimente ledit fil de chauffage 5 avec un courant électrique. With reference to FIG. 3 showing a flow diagram of an example of the method according to the invention, an explanation will be given of the operation of the detection device 15. According to a step 101, said heating wire 5 is supplied with an electric current.
Puis, selon une étape 103, on déplace le balai d’essuie-glace selon un mouvement de va-et-vient sur la vitre 1. Then, according to a step 103, the wiper blade is moved in a back and forth movement on the window 1.
Les étapes 101 et 103 ne doivent pas être nécessairement être réalisées dans cette ordre, mais on peut aussi les inverser. Il est seulement important que les fils de chauffage 5 soient alimentés en courant pour pouvoir détecter le champ magnétique émis. Steps 101 and 103 do not necessarily have to be performed in this order, but they can also be reversed. It is only important that the heating wires 5 are supplied with current in order to be able to detect the magnetic field emitted.
Puis, lors de l’étape 105, on détecte par le capteur 19 le champ magnétique émis par le fil de chauffage 5 et on déduit lors de l’étape 107 une position du bras de balai 13 d’essuie-glace à partir du champ magnétique détecté. Then, during step 105, the magnetic field emitted by the heating wire 5 is detected by the sensor 19 and a position of the wiper blade arm 13 from the field is deduced during step 107. magnetic detected.
Lorsque l’on détecte le champ magnétique, on relève par exemple les mesures en fonction du temps et on détecte les maxima d’amplitude du champ magnétique mesuré. La détection d’un maximum local peut être réalisée par franchissement d’un seuil, avec par exemple un trigger de Schmitt ou simplement par un circuit électronique dériveur adapté. When the magnetic field is detected, the measurements are taken as a function of time, for example, and the amplitude maxima of the measured magnetic field are detected. The detection of a local maximum can be achieved by crossing a threshold, for example with a Schmitt trigger or simply by a suitable electronic diverter circuit.
Sur le diagramme de la figure 1 , on relève sept maxima M1 à M7 correspondant donc à sept positions spécifiques (cinq positions B, C, E, et F sont représentées sur la figure 1 ) que peut prendre le bras de balai 13 sur la vitre arrière 1. On the diagram of FIG. 1, there are seven maxima M1 to M7 therefore corresponding to seven specific positions (five positions B, C, E, and F are shown in FIG. 1) which the brush arm 13 can take on the glass. rear 1.
Chacun de ces maxima M1 à M7 correspond à une position angulaire du bras de balai d’essuie-glace où le capteur 19 se trouve en vis-à-vis d’une portion du fil de chauffage 5. Each of these maxima M1 to M7 corresponds to an angular position of the wiper blade arm where the sensor 19 is located opposite a portion of the heating wire 5.
Pour l’exploitation des signaux de mesure, on mémorise par exemple dans la mémoire 25 la correspondance entre la position (par exemple angulaire) du bras de balai 13 d’essuie-glace sur la vitre 1 et chaque maximum M1 à M7 du signal de mesure du champ magnétique. For processing the measurement signals, the correspondence between the position (for example angular) of the wiper blade arm 13 on the window 1 and each maximum M1 to M7 of the signal is stored in memory 25, for example. magnetic field measurement.
Pour avoir une résolution plus fine, on peut notamment interpoler la position du bras de balai 13 d’essuie-glace entre deux maxima Mi et M OU MM d’amplitude détectés du champ magnétique (i étant un nombre entier). A partir des mesures, on peut en outre calculer à partir des positions détectées la dérivée première et seconde en fonction du temps pour en déduire respectivement la vitesse de déplacement du balai 13 d’essuie-glace et l’accélération de celui-ci. To have a finer resolution, it is possible in particular to interpolate the position of the wiper blade arm 13 between two maxima Mi and M OR MM of detected amplitude of the magnetic field (i being an integer). From the measurements, it is also possible to calculate from the detected positions the first and second derivative as a function of time in order to deduce therefrom respectively the speed of movement of the wiper blade 13 and the acceleration thereof.
En particulier la position du bras de balai 13 d’essuie-glace peut être mise à profit pour un procédé de nettoyage d’une vitre de véhicule automobile, dans lequel on détecte le déplacement du balai d’essuie-glace 1 1 selon le procédé comme décrit ci-dessus sans avoir besoin de données du moteur d’entraînement et on déclenche lors d’une étape 109 par exemple la projection d’un liquide de lavage sur la vitre 1 lorsque le bras de balai 13 d’essuie-glace atteint une position prédéterminée propice à améliorer le nettoyage et/ou le dégivrage de la vitre arrière 1 . In particular, the position of the wiper blade arm 13 can be used for a method of cleaning a window of a motor vehicle, in which the movement of the wiper blade 11 is detected according to the method. as described above without the need for data from the drive motor and, in a step 109, for example, the spraying of a washing liquid is triggered on the window 1 when the wiper blade arm 13 reaches a predetermined position suitable for improving the cleaning and / or defrosting of the rear window 1.
On comprend donc que la présente invention permet une détection simple et efficace de la position du balai d’essuyage 1 ou du bras de balai 13 sur la vitre 1 . Cette détection peut en particulier être indépendante du système d’entraînement du balai d’essuie-glace. It is therefore understood that the present invention allows simple and effective detection of the position of the wiper blade 1 or of the brush arm 13 on the window 1. This detection can in particular be independent of the drive system of the wiper blade.

Claims

Revendications Claims
1. Procédé de détection d’une position d’un bras de balai (13) d’essuie-glace sur une vitre (1 ) équipée d’au moins un fil de chauffage (5), dans lequel : 1. Method for detecting a position of a wiper blade arm (13) on a window (1) equipped with at least one heating wire (5), in which:
- on alimente ledit fil de chauffage (5) avec un courant électrique, - said heating wire (5) is supplied with an electric current,
- on déplace le balai d’essuie-glace (1 1 ) selon un mouvement de va-et-vient sur la vitre (1 ), - we move the wiper blade (1 1) in a back and forth movement on the window (1),
- on détecte par un capteur (19) monté sur le balai (1 1 ) ou le bras de balai (13) d’essuie-glace le champ magnétique émis par le fil de chauffage lorsque le capteur (19) passe au cours du mouvement de va-et-vient au niveau d’une portion du fil de chauffage (5), et - We detect by a sensor (19) mounted on the wiper blade (1 1) or the wiper blade arm (13) the magnetic field emitted by the heating wire when the sensor (19) passes during the movement back and forth at a portion of the heating wire (5), and
- on déduit une position du bras de balai (13) d’essuie-glace à partir du champ magnétique détecté. - a position of the wiper blade arm (13) is deduced from the detected magnetic field.
2. Procédé de détection selon la revendication 1 , selon lequel on détecte le champ magnétique en fonction du temps et on détecte les maxima d’amplitude (M1 à M7) des signaux de mesure du champ magnétique, un maximum correspondant à une position du bras de balai (13) d’essuie-glace où le capteur se trouve en vis-à-vis d’une portion du fil de chauffage (5). 2. Detection method according to claim 1, in which the magnetic field is detected as a function of time and the amplitude maxima (M1 to M7) of the magnetic field measurement signals are detected, a maximum corresponding to a position of the arm wiper blade (13) where the sensor is located opposite a portion of the heating wire (5).
3. Procédé selon la revendication 1 ou 2, dans lequel on mémorise dans une mémoire (25) la correspondance entre la position du bras de balai (13) d’essuie-glace sur la vitre et chaque maximum d’amplitude de champ magnétique (M1 à M7). 3. Method according to claim 1 or 2, in which the correspondence between the position of the wiper arm (13) on the window and each maximum magnetic field amplitude (25) is memorized in a memory (25). M1 to M7).
4. Procédé selon l’une quelconque des revendications 1 à 3, dans lequel on interpole la position du bras de balai (13) d’essuie-glace entre deux maxima d’amplitude (Mi, Mi+/-i) détectés du champ magnétique. 4. Method according to any one of claims 1 to 3, in which the position of the wiper blade arm (13) is interpolated between two amplitude maxima (Mi, Mi +/- i ) detected from the field. magnetic.
5. Procédé selon l’une quelconque des revendications 1 à 4, dans lequel on calcule à partir des positions détectées la dérivée première et seconde en fonction du temps pour en déduire respectivement la vitesse de déplacement du balai d’essuie-glace (1 1 ) et l’accélération de celui-ci. 5. Method according to any one of claims 1 to 4, in which the first and second derivative as a function of time are calculated from the detected positions in order to deduce respectively the speed of movement of the wiper blade (1 1 ) and the acceleration thereof.
6. Procédé selon l’une quelconque des revendications 1 à 5, dans lequel ledit capteur (19) est monté au niveau de l’extrémité libre du bras de balai d’essuie-glace (13). 6. Method according to any one of claims 1 to 5, wherein said sensor (19) is mounted at the free end of the wiper blade arm (13).
7. Procédé selon l’une quelconque des revendications 1 à 6, dans lequel ledit capteur (19) est un capteur à effet Hall. 7. Method according to any one of claims 1 to 6, wherein said sensor (19) is a Hall effect sensor.
8. Procédé de nettoyage d’une vitre de véhicule automobile, équipée d’au moins un fil de chauffage (5) et d’un balai d’essuie-glace (1 1 ), comprenant les étapes suivantes : 8. A method of cleaning a motor vehicle window, equipped with at least one heating wire (5) and a wiper blade (1 1), comprising the following steps:
- on détecte le déplacement du balai d’essuie-glace (1 1 ) selon le procédé selon l’une quelconque des revendications 1 à 7, - the movement of the wiper blade (1 1) is detected according to the method according to any one of claims 1 to 7,
- on déclenche la projection d’un liquide de lavage sur la vitre (1 ) lorsque le bras de balai (13) d’essuie-glace atteint une position prédéterminée. - spraying of a washing liquid is triggered on the window (1) when the wiper arm (13) reaches a predetermined position.
9. Dispositif de détection d’une position d’un bras de balai (13) d’essuie-glace sur une vitre (1 ) équipée d’au moins un fil de chauffage (5), comprenant : 9. Device for detecting a position of a wiper arm (13) on a window (1) fitted with at least one heating wire (5), comprising:
- une unité de commande (17) configurée pour alimenter ledit fil de chauffage (5) avec un courant électrique, - a control unit (17) configured to supply said heating wire (5) with an electric current,
- un capteur (19) de champ magnétique monté sur le balai (1 1 ) ou le bras de balai (13) d’essuie-glace configuré pour mesurer un champ magnétique émis par le fil de chauffage lorsque le capteur (19) passe au cours du mouvement de va-et-vient au niveau d’une portion du fil de chauffage (5), - a magnetic field sensor (19) mounted on the wiper blade (1 1) or the wiper blade arm (13) configured to measure a magnetic field emitted by the heating wire when the sensor (19) during the back and forth movement at a portion of the heating wire (5),
- une unité de traitement (21 ) configurée pour déduire une position du bras de balai (13) d’essuie-glace à partir du champ magnétique détecté. - a processing unit (21) configured to deduce a position of the wiper blade arm (13) from the detected magnetic field.
10. Dispositif de détection selon la revendication 9, selon lequel l’unité de traitement (21 ) est configurée pour détecter les maxima d’amplitude (M1 à M7) des signaux de mesure du champ magnétique, un maximum correspondant à une position du bras de balai (13) d’essuie-glace où le capteur (19) se trouve en vis-à-vis d’une portion du fil de chauffage. 10. Detection device according to claim 9, according to which the processing unit (21) is configured to detect the amplitude maxima (M1 to M7) of the magnetic field measurement signals, a maximum corresponding to a position of the arm. wiper blade (13) where the sensor (19) is located opposite a portion of the heating wire.
11. Dispositif selon la revendication 9 ou 10, dans lequel l’unité de traitement (21 ) comprend une mémoire (25) dans laquelle est enregistré la correspondance entre la position du bras de balai (13) d’essuie-glace sur la vitre (1 ) et chaque maximum d’amplitude de champ magnétique (M1 à M7). 11. Device according to claim 9 or 10, in which the processing unit (21) comprises a memory (25) in which the correspondence between the position of the wiper arm (13) on the window is recorded. (1) and each maximum magnetic field amplitude (M1 to M7).
12. Dispositif selon l’une quelconque des revendications 9 à 1 1 , dans lequel l’unité de traitement (21 ) est configurée pour interpoler la position du bras de balai d’essuie- glace entre deux maxima d’amplitude détectés du champ magnétique (Mi, Mi+/-i). 12. Device according to any one of claims 9 to 1 1, wherein the processing unit (21) is configured to interpolate the position of the wiper blade arm between two maximum amplitudes of the detected magnetic field (Mi, Mi + / -i).
13. Dispositif selon l’une quelconque des revendications 9 à 12, dans lequel ledit 13. Device according to any one of claims 9 to 12, wherein said
capteur (19) est monté au niveau de l’extrémité libre du bras de balai (13) d’essuie- glace. sensor (19) is mounted at the free end of the wiper blade arm (13).
14. Dispositif selon l’une quelconque des revendications 9 à 13, dans lequel ledit 14. Device according to any one of claims 9 to 13, wherein said
capteur (13) est un capteur à effet Hall. sensor (13) is a Hall effect sensor.
15. Bras de balai d’essuie-glace pour un dispositif selon la revendication 14, caractérisé en ce qu’il comprend un capteur à effet Hall fixé sur une face du bras de balai (13) d’essuie-glace destiné à être en vis-à-vis de la vitre (1 ) à essuyer. 15. Wiper blade arm for a device according to claim 14, characterized in that it comprises a Hall effect sensor fixed on one face of the wiper blade arm (13) intended to be in opposite the window (1) to be wiped.
PCT/EP2019/082149 2018-12-20 2019-11-21 Method for detecting the position of a wiper blade arm and device for implementing the method WO2020126300A1 (en)

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FR1873687 2018-12-20
FR1873687A FR3090857B1 (en) 2018-12-20 2018-12-20 Method for detecting a position of a wiper blade arm and device for implementing the method

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007001080A1 (en) * 2007-01-04 2008-07-10 Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg Electrically heated window pane
DE102008001568A1 (en) * 2008-05-06 2009-11-12 Robert Bosch Gmbh Method for mounting a wiper arm, method for adjusting or operating a windshield wiper device and wiper device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007001080A1 (en) * 2007-01-04 2008-07-10 Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg Electrically heated window pane
DE102008001568A1 (en) * 2008-05-06 2009-11-12 Robert Bosch Gmbh Method for mounting a wiper arm, method for adjusting or operating a windshield wiper device and wiper device

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FR3090857A1 (en) 2020-06-26

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