WO2009080390A1 - Procédé et dispositif de commande du cycle de travail d'un dispositif d'essuie-glace - Google Patents

Procédé et dispositif de commande du cycle de travail d'un dispositif d'essuie-glace Download PDF

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Publication number
WO2009080390A1
WO2009080390A1 PCT/EP2008/064450 EP2008064450W WO2009080390A1 WO 2009080390 A1 WO2009080390 A1 WO 2009080390A1 EP 2008064450 W EP2008064450 W EP 2008064450W WO 2009080390 A1 WO2009080390 A1 WO 2009080390A1
Authority
WO
WIPO (PCT)
Prior art keywords
wiper device
windshield wiper
measuring surface
determining
signal
Prior art date
Application number
PCT/EP2008/064450
Other languages
German (de)
English (en)
Inventor
Heinz Waeldele
Francis Glohr
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2009080390A1 publication Critical patent/WO2009080390A1/fr

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Classifications

    • 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
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • 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
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0833—Optical rain sensor

Definitions

  • the invention relates to a method and a device for controlling the working cycle of a windshield wiper device, wherein the amount of water striking a measuring surface in the effective region of the windshield wiper device is determined and the proportion transported through the windshield wiper device onto the measuring surface is subtracted therefrom.
  • Devices of the type described above are used in motor vehicles to adapt the power stroke and / or the operating speed of the windscreen wiper device to the weather conditions. With a small amount of water impinging on the pane, a large interval between two wiping cycles is initially selected. As the amount of precipitation increases, the wiping interval is shortened, until finally a continuous operation of the windscreen wiper device begins.
  • Disc defines a measuring surface. If a drop of water adheres to the measuring surface, the surface which is inserted into the pane is pelte light over the water droplets from the disc decoupled. As a result, the incoming light signal in the receiver diode is weakened. If the weakening has exceeded a predefinable threshold value, the windshield wiper device is activated and carries out at least one wiping cycle.
  • the sensor can determine the cleaning effect caused by the wiping process, it is arranged in the wiping field of the windscreen wiper device and wiped off by it. Since the windscreen wiper device collects water from the remaining surface areas of the windshield and subsequently carries with it, this water also reaches the measuring surface and is interpreted by the sensor as water impinging on the windscreen. However, to allow for reliable control of the windshield wiper device, only the water incident on the windshield from the environment must be registered by the sensor and the xverden signal change caused by the wipe must not be taken into account.
  • the electronics downstream of the sensor turns on the windshield wiper device to remove the alleged moisture from the windshield.
  • One Such behavior of the automated windshield wiper device is experienced by the user as extremely annoying and technically immature. Furthermore, such behavior wears out both the components of the windshield wiper device f and the disc itself due to adhesive, abrasive contamination.
  • the invention is therefore based on the object of specifying an over-wiper identification which reliably and largely independently of the signal affecting boundary conditions detects the over-wiping and thereby makes it possible to determine the amount of water reaching the disk from the environment.
  • the object is achieved according to the invention by a method for controlling the power stroke of a windscreen wiper device, wherein the amount of water impinging on a measuring surface in the effective range of the windscreen wiper device is determined and the proportion transported by the windscreen wiper device to the measuring surface is subtracted, whereby extreme values of the determined on the measuring surface impinging amount of water and a predetermined number of maxima per wiping cycle is subtracted.
  • a method for controlling the power stroke of a windscreen wiper device wherein the amount of water impinging on a measuring surface in the effective range of the windscreen wiper device is determined and the proportion transported by the windscreen wiper device to the measuring surface is subtracted, whereby extreme values of the determined on the measuring surface impinging amount of water and a predetermined number of maxima per wiping cycle is subtracted.
  • a rain sensor for controlling the power stroke of a windshield wiper device, wherein means is provided to determine the impinging on a measuring surface in the effective range of the windshield wiper device water quantity and to subtract from it by the windshield wiper device transported to the measuring surface portion, wherein the means for determining the proportion transported by the windshield wiper device to the measuring device comprises means for determining the extreme values of the output signal and provided for this purpose is to subtract a predetermined number of maxima per wipe cycle.
  • Windscreen wiper device is not necessary. Rather, it is sufficient to discard a number of maxima of the sensor output signal corresponding to the number of over-wipers as incorrect values. This is done by subtracting the extreme values from the output signal.
  • the number of maxima to be subtracted per wipe cycle corresponds to the number of wipers which is known by the type of windshield wiper device and the placement of the measurement surface in the wiping field.
  • a wiping cycle is the time from leaving the parking position until reaching the parking position again.
  • Parking position must therefore be detected from leaving the parking position to the re-reaching the park two wipers. If the wiper has two parking positions, only one maximum would be deducted from leaving the first parking position until reaching the second parking position. In the case of two-arm windscreen wipers with a parking position frequently used in motor vehicles, the number of sub- traversing maxima 2 or 4, depending on whether both wiper arms sweep the measuring surface or only a wiper arm.
  • a maximum of the water coverage of the measuring surface correlates with a minimum of the detected light and thus with a minimum of the output signal.
  • a maximum within the meaning of the invention should therefore be present when a large amount of water is detected on the measuring surface.
  • the water introduced from the environment onto the glass can be caused by precipitation such as rain or snow. Furthermore, the water can reach the glass by mist or condensation from the atmosphere. Furthermore, water from the roadway can be whirled up by other vehicles. As far as the following description of water is concerned, all these examples are included equally
  • the rain sensor according to the invention has an analog or digital measuring electronics.
  • this measuring electronics can determine, for example, the time derivative Ges output signal of the sensor and subsequently determine the zeros of this derivative. The sensor signal at the zero of the derivative is then subtracted.
  • a process control in which the wiping cycle from leaving the parking position to the Becker- reaching the park position divided into a predetermined number of time windows and in each time window, the average or maximum sensor signal is determined. Those time windows, in which the one or more wipers fall, have an extreme value of the average output signal. The time windows with the largest signal excursion are discarded and are not used to determine the per wiping cycle impacting the disc water. A further increase in accuracy can be achieved in that only maxima for subtraction are selected, which are detected within at least one predeterminable time window after leaving the parking position.
  • the pulse of the control unit which starts the wiping cycle, serves to start a delay element ⁇ which triggers a gate signal after a predefinable period of time, which according to experience is sufficient to bring the windshield wiper device from the parking position to the measuring surface.
  • the evaluation of the rain sensor will then, depending on the number of systemic over wiper, only select those maxima that occur at the same time with the gate signal. If several maxima occur in this time window than the number of system-related over-wipers, the maxima with the largest amplitude are selected for subtraction.
  • the position of the time window within the wiping cycle is adapted as a function of the driving speed. This measure takes into account that the drive rotor of the windscreen wiper device must move the wiper device against the wind. With a larger wind the movement is therefore slowed down.
  • the electronically coded speed signal of the tachometer can be used to influence the delay element and to adjust the position of the time window.
  • the specifiable number of subtractable over wipers is stored in a memory in the rain sensor. From this memory, the number to be used in the relevant vehicle can be selected by means of hardware or software coding before or after installation. In particular, jumpers or dip switches are suitable for hardware coding. Software coding can be done via the interface to the vehicle, either in the form of an integer number, which indicates the number of over wipers directly or as encoding of the vehicle type.
  • FIG. 1 and FIG. 2 each show the time profile of the output signal of a rain sensor during a working cycle of the windscreen wiper device.
  • the time course of a trigger signal is shown, which is triggered by the windshield wiper device and marks the leaving or reaching the parking position of the wiper device.
  • the time between start and stop signal of the trigger signal is about 0.5 to about 2 seconds, depending on the operating speed of the windscreen wiper device, the vehicle type and the installation situation.
  • the output signal of a rain sensor is shown. Shown is the case in which rainfall on the equipped with the rain sensor disc act »Any drop in the measuring range of the disc water droplets here ensures a weakening of the detected in the receiver diode of the rain sensor light. A maximum of the detected amount of water is thus a minimum of the detected Lichrmenge.
  • Another raindrop hits in the measuring range of the disc.
  • the disk is already wetted with a certain amount of water, so that the output signal at the beginning of the time segment of Figure 1 does not correspond to the zero value with a dry disk.
  • the wiper arm Since the distance of the wiper arm from the reversal position to the measuring surface is lower in this example, the wiper arm accumulates a smaller amount of water in this way, which leads to a smaller deflection of the sensor signal at time ⁇ 4. After the wiper arm has passed the measuring surface, it is completely dry. The output of the rain sensor reaches a maximum value, which is due to the fact that the injected light is almost completely directed by total reflection on the receiving diode.
  • time windows are schematically shown, in which the control unit of the rain sensor subdivides the rain signal described above.
  • the opening of the first time window is triggered by leaving the parking position of the windshield wiper device. After the first time window has been closed, the second opens, and so on. In this way, the complete wipe cycle is divided into discrete time steps.
  • the time windows do not have to be arranged equidistantly. It would also be possible in the mid-range. at the expected over wiper, a closer discretization before ⁇ increase.
  • the controller now determines the signal dip of the sensor output for each time slot. This can be done, for example, by forming the difference between the initial value and the final value for each discrete time step.
  • the time windows with the largest signal collapse ie the time windows with the maximum detected amount of water
  • the time windows with the maximum detected amount of water are regarded as over-wipers and subtracted from the measured signal.
  • the subtraction can be implemented in a particularly simple manner in that the time windows with the largest Signal collapse be rejected as an invalid measurement.
  • the average amount of water impinging on the pane is determined, from which in turn the operating speed and / or the working cycle of the windscreen wiper device can be determined.
  • Figure 2 shows the identical trigger signal generated by the windshield wiper device. Further shows
  • FIG. 2 shows the exemplary course of the output signal of a rain sensor identical to FIG.
  • the discriminator generates a trigger signal when the output signal of the rain sensor changes by a predefinable threshold value.
  • the trigger signal thus generated triggers the generation of a time window with a predefinable length.
  • a time window is generated for each detected event.
  • the number of time windows per wipe cycle is variable according to the detected events.
  • the signal dip of the output signal is again determined for each time window.
  • the subtraction of the signal generated by the over-wipe is again done by discarding the time windows with the largest signal dip as invalid measurements. In the present example, these are the time windows 3 and 4.
  • the average rainfall on the pane is determined by the measured values of the time windows 1, 2, 5, 6 and 7. From this average amount of rain, in turn, the power stroke and / or the operating speed of the windshield wiper device is determined.
  • the evaluation of the measurement signals can also take place by determining the maximum values, the minimum values, the mean values and / or the integrated output value for each discrete time step.
  • the signal of the Reqensensors can also be stored in a memory during the wiping cycle and only after the wiping cycle in the manner described can be analyzed.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de commande du cycle de travail d'un dispositif d'essuie-glace. On a prévu un équipement permettant de déterminer la quantité d'eau touchant une surface de mesure dans la zone active du dispositif d'essuie-glace et d'en soustraire la part transportée par le dispositif d'essuie-glace sur la surface de mesure. L'équipement présente, pour déterminer cette part, des moyens de détermination des valeurs extrêmes du signal de sortie et on a prévu à cet effet de soustraire un nombre prédéfinissable de valeurs extrêmes par cycle d'essuyage.
PCT/EP2008/064450 2007-12-20 2008-10-24 Procédé et dispositif de commande du cycle de travail d'un dispositif d'essuie-glace WO2009080390A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710061747 DE102007061747A1 (de) 2007-12-20 2007-12-20 Verfahren und Vorrichtung zur Steuerung des Arbeitstaktes einer Scheibenwischvorrichtung
DE102007061747.1 2007-12-20

Publications (1)

Publication Number Publication Date
WO2009080390A1 true WO2009080390A1 (fr) 2009-07-02

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PCT/EP2008/064450 WO2009080390A1 (fr) 2007-12-20 2008-10-24 Procédé et dispositif de commande du cycle de travail d'un dispositif d'essuie-glace

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DE (1) DE102007061747A1 (fr)
WO (1) WO2009080390A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112706693B (zh) * 2020-12-25 2022-06-24 一汽奔腾轿车有限公司 一种控制后视镜加热刮水的方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19839273A1 (de) * 1998-03-17 1999-09-23 Bosch Gmbh Robert Optischer Sensor
EP1495928A1 (fr) * 2002-03-13 2005-01-12 Nippon Sheet Glass Company, Limited Procede de regulation de nettoyeur et regulateur correspondant
EP1627785A1 (fr) * 2004-08-20 2006-02-22 Denso Corporation Système de communication entre dispositifs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19839273A1 (de) * 1998-03-17 1999-09-23 Bosch Gmbh Robert Optischer Sensor
EP1495928A1 (fr) * 2002-03-13 2005-01-12 Nippon Sheet Glass Company, Limited Procede de regulation de nettoyeur et regulateur correspondant
EP1627785A1 (fr) * 2004-08-20 2006-02-22 Denso Corporation Système de communication entre dispositifs

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DE102007061747A1 (de) 2009-06-25

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