FR2663276A1 - DEVICE FOR CONTROLLING A WIPER, CONTROLLED BY A SENSOR, IN PARTICULAR A RAIN SENSOR. - Google Patents

Abstract

a) Device for controlling a windscreen wiper, controlled by a sensor, in particular a rain sensor. b) Device characterized in that it comprises a signal processing device (13) which influences the interval (I) between successive cleaning phases as a function of the number of signals supplied by the sensor (12) and located in a window of time. c) The invention relates to a device for controlling a windscreen wiper, controlled by a sensor, in particular a rain sensor.

Description

"Device for controlling a windscreen wiper,

  sent by a sensor, especially a rain sensor ".

  The present invention relates to a device

  for controlling a windshield wiper according to a function

intermittently.

  Device for controlling a wiper

  ice in intermittent operation, comprising at least one sensor which provides a control signal of the wiper according to the fouling and / or deposition of moisture or the amount of rain arriving

on the windshield to clean.

  According to US-A-45 42 325 is known

  a windscreen wiper system for a motor vehicle

  which is controlled by a rain sensor.

  crushing, moisture layer or amount of rain

  falling on an ice to be cleaned (windshield) are de-

  by a rain sensor that provides a signal to the windshield wiper control circuit The sensor detects a small test surface compared to

  the entire surface of the windscreen In particu-

  bind, in the case of intermittent operation, one

  may have irregular cleaning operations.

  The operating method described in the document

  US-A-45 42 325 for the purpose of regulating

  wiping periods, plans to eliminate the integration

  signals from the rain sensor during

  performing a wiping motion The method

  naked defines essentially a lower limit for the interval between two wiping operations, lower limit which must not be exceeded at

  during intermittent operation.

  The object of the present invention is to improve

  intermittent operation of a paper towel

ice controlled by a sensor.

Advantages of the invention

  A first solution corresponds to a provision

  signal processing system which influences the inter-

  valle between two successive cleaning phases depending on the number of signals provided by the sensor, preferably number reported to the signals that arrive

  in the interval of a predetermined time segment.

  Another solution provides a signal processing device which influences the interval between two successive cleaning phases as a function of

less than a previous interval.

  Another solution relates to a signal processing device which influences the interval between two consecutive cleaning phases as a function of

  the duration of at least one prior cleaning interval

laughing.

  Another solution is provided for in a

  signal processing system which influences the inter-

  between two successive cleaning phases in

  function of a duration between the arrival of the

provided by the sensor.

  The characteristics of the above solutions can be used separately but also in any combination. It is particularly advantageous to adapt the interval between two successive cleaning phases to the actual cleaning needs.

  taking into account either the signals provided by the

  rain, that is, the previous course of the

cleaning phase.

  The devices according to the invention correspond to

  the above solutions make it possible to compensate

  the interval between two successive cleaning phases

  ves, avoiding the very important variations between

  different intervals and allowing a resolution

  the most regular of the cleaning operations.

  The devices according to the invention are

  with a simple means A wiper controlled by a rain sensor contains in any case a circuit to exploit the signals provided by the

  which is supplemented or extended by a

  tif processing the signals, to exploit and calculate the signals as necessary If necessary,

just edit a program.

  Other developments and improvements

will appear below.

  It is particularly advantageous to form the difference in the duration of the intervals by using the duration of the previous wiping phase and the time between the arrival of the signals provided by

  the sensor The formation of the difference of these values

  their detected simplifies the exploitation of signals

  and allows you to consider a trend.

  An advantageous development consists of

  determine the quantities detected and / or the differences determined The weighting allows a further exploitation of the last phases of wiping vis-à-vis

  reduced exploitation of the cleaning phases

age that are older.

  It is particularly advantageous to

  to reduce the time interval in which the number of control signals provided by the sensor is obtained,

  and change this interval according to a large

  in practice, and which, for example, is based on the previously determined number of

sensor signals.

  According to an advantageous development, the weighting or the fixing of the time interval is made as a function of the speed of the vehicle to which the device of the invention is applied.

  further adaptation to cleaning needs.

  For intermittent operation of the

  soot-ice, functioning considered pleasant

  by all, it is advantageous to

  lower and / or upper limit of the interval

  separating two consecutive cleaning phases.

  below the limit, the windshield wipers

  permanently and above the limit

soot-ice is for example cut.

  The present invention will be described hereinafter

  in more detail with the aid of a se-

  the invention shown in the accompanying drawings in which Drawings.

  FIG. 1 is a block diagram of a device

  according to the invention for the control of a wiper

ice cream.

  Figure 2 shows timing diagrams of a signal provided by a sensor and scan steps

according to the state of the art.

  Figures 3 to 5 show timing diagrams of a signal provided by a rain sensor as well as scanning phases corresponding to devices

of the invention.

  Figure 1 shows a block diagram of a

  positive control of a wiper 10 actuated by a drive means 11 The wiper 10 cleans the surface of a windshield not shown Dirt

  on the surface of the windscreen or a deposition of

  where rain falling on the windshield is detected

  by a sensor 12 which provides a signal to a dis-

  positive signal processing 13 The device 13

  receives signals from a control device

  of 14 which includes elements not shown

  The device 13 furthermore receives a signal from the driving means 11, from which it deduces the duration of a cleaning phase of the windscreen wiper 10. example from a limit switch not shown in Figure 1 and belonging to the

driving medium 11.

  The wiper 10 is for example intended to

  clean the surface of a windshield fitted to a vehicle

  Instead of the windshield wiper 10 of the

  Figure 1 could also have several wipers

  operated by one or more means of training

11.

  Figure 2 shows in its upper part

  re, the timing diagram of the signal 50, S 1, S-2, S-3, S-4.

  The wiping phases thus triggered W 0, W-1, W_ 2,

  W.3 corresponding to the state of the art are

  The duration of the wiping phases bears the references TO, T_ 1, T-2, T 3 The wiping phases W 0, W 1, W-2, W-3

  occur at irregular intervals.

  S-2, S-3 are, for example, close together in time, so that the intermittent operation of the windscreen wiper transforms for a short time into continuous operation and the cleaning phase W-2 consists of two cycles. separate cleaning that are triggered directly one as a result of

  Figure 2 further indicates that the differences

  annuities cleaning phases may have a duration

  different TO, T 1, T 2, T 3 This is indicated by

  strongly exaggerated in Figure 2 for the phases

cleaning W 0, W 1.

  FIG. 3 shows timing diagrams of signals of the first device according to the invention.

  signal processing device 13 we have an inter-

  time interval of predetermined duration F, in which the signals 50, S-1, S-2, S 3 provided by the sensor 12 are counted. The result of this count influences the duration I o of the predetermined wiping interval situated between the two cleaning phases W 0, W 1 The figure

  3 shows that the wiping interval W O is not

  latched directly after the arrival of the signal 50 The signal 50 emitted by the sensor 12, signal which indicates

  a certain degree of fouling and / or deposition of moisture

  or a quantity of rain on the windshield to be cleaned, remains until the cleaning is completed during the cleaning phase W O ending

  the active state of the signal 50 The duration F of this interval

  it can be predetermined in a fixed manner Preferably

  This duration is variable. The duration F of the in-

  for example, varies depending on the speed of the vehicle as the windshield wipers

  cleans the windshield of a car

  In addition, the duration F can depend on the number

provided signals 50, S_, S-2, S-3.

  The chronograms of the signals 50, S 1, S-2

  and cleaning phases W 1, W 0, W-1, W-2 represent

  FIGS. 4 correspond to another device of the invention. The signals 50, S-1, S-2 are supplied by the rain sensor 12. The cleaning phases W 1, W 0, W 1, W-2 triggered by these signals have a different duration TO, T_ 1, T 2 These different durations

  TO, T 1, T-2 depending on the state of the surface of the

  rewind to clean as well as the condition of the wiper

  ice 10 and the driving means 11 The durations To,

  T_ 1, T 2 increase as the screen

  The breeze dries up because the friction increases.

  vention, it is expected to operate at least a duration To, T 1, T 2 cleaning phases W 0, W 1, W-2 to influence the predetermined interval Io for the phase

  following cleaning procedure W 1 and following the net

  This influence is explained in FIG. 4 by the fact that each signal 50, S-, S-2 does not necessarily trigger a cleaning phase W 1, W 0, W 1, W 2. The cleaning phase W 1 next to trigger

  happens for example, although the sensor 12 did not

nor any corresponding signal S.

  Figure 5 shows the chronogram of

  51, 50, S-1, S-2 and cleaning phases W 1, W 0, W 1, W-2 which correspond to the other devices of the invention The signals S ,, 50, S ,, S- 2 are the

  sensor signals 12 The duration of the cleaning phases

  Thus, the triggers have the references W 1, WO, W 1, W 2. The time interval between the signals S-2 and S-1 is D-1; the interval between

  signals S, 1 and 50 bears the reference Do

  the between successive cleaning phases carries

the references Io, I_, I 2.

  In a device according to the invention, it is

  read at least one interval C 1, D -1 between the signals S 1, S 1, S 2 to influence the following scanning interval I o In another device of the invention, the duration I 1, I-2 of at least one interval is planned

to influence the interval Io.

  In the signal processing device 13, the processing of the detected values is simplified if

  the difference is formed by the successive time intervals

  The differences in the phases are then exploited

  cleaning To T-1 and T-1 T-2 or durations Do -

D-1 or I-1 intervals I-2.

  A particularly advantageous embodiment of the devices of the invention provides for weighting the values entered and / or the differences which have been averaged by the weighting we arrive at a

  better exploitation of the latest results by

  port to the results of the past As value is provided either the times entered wiping phases TO, T 1, T 2 or the intervals Do, D-1 signals 50, S-1,

  S-2 or intervals 1-1, I-2 between the phases of

  W-1 and W-2 as well as between W-2 and W-3.

  In so far as the devices of the in-

  The invention is particularly advantageous for this weighting as a function of the speed of the vehicle. A greater speed results in a greater resolution of the wiping phases W.

  Another achievement of the device of the in-

  vention predicts a minimum interval I

  mum and / or a maximum range Below the limit

  lower half of the time, we switch to

  the permanent operation of the wiper 10 Au-

  above this limit, the

interval operation.

  The devices according to the invention are de-

  during the first implementation of the

  wiper after a pause in operation

  extended by using an appropriate method to

  to calculate the following intervals I A

  appropriate start-up method provides, for example, for

  weld each time a wiping phase W after

  riveted a signal S provided by the sensor 12.

  The devices according to the invention can be developed so that for example a projection

  brutal water during an operating interval

  if it exceeds a predetermined threshold for the

  general provided by the sensor 12, controls the operation

  intermittent and leads to

are of limited duration.

  Although the treatment device of

  may be achieved in the field of

  analogue circuits, it is

  digital signal and this signal processing

  can advantageously be done in a computer.

Claims (3)

R E V E N D I C A T IO N S   1) Device for controlling a wiper   ice cream (10) in intermittent operation, comprising at least one sensor (12) which provides a signal (S) for controlling the windscreen wiper (10) as a function of the crumbling and / or deposition of moisture or quantity   of rain arriving on the windshield to be cleaned,   in that it includes a device for   signal (13) which influences the interval (I)   between successive cleaning phases (W) as a function   the number of signals (S) supplied by the sensor   (12) and being in a time window.   2) Device for controlling a wiper   ice cream (10) in intermittent operation, comprising at least one sensor (12) which provides a signal (S) of   controlling the windscreen wiper (10) according to the   crushing and / or moisture deposition or quantity   of rain arriving on the windshield to be cleaned,   in that it includes a device for   signal (13) which influences the interval (I) between consecutive cleaning steps (W) according to at least one interval time to be traveled (I_ 1, I 2).   ) Device for controlling a wiper   ice cream (10) in intermittent operation, comprising at least one sensor (12) which provides a signal (S) of   controlling the windscreen wiper (10) according to the   crushing and / or moisture deposition or quantity   of rain arriving on the windshield to be cleaned,   in that it includes a device for   signal (13) which influences the interval (I)   between successive cleaning phases (W) as a function   duration (T-1, T-2) of at least one step of previous cleaning (W-1, W-2).   40) Device for controlling a wiper   ice cream (10) in intermittent operation, comprising at least one sensor (12) which provides a signal (S) of   controlling the windscreen wiper (10) according to the   crushing and / or deposition of moisture or the amount of rain arriving on the windshield to be cleaned,   in that it includes a device for   signal (13) to influence the interval (I) between two consecutive cleaning phases (W) as a function of at least one duration (C 1, D -1) between the arrival of the signals (SO, S-1). 1; S-1, S-2) provided by the sensor (12).   ) Device according to any one of   claims 1 to 4, characterized in that it is   by any combination of the object of the 1 to 4.   ) Device according to one of the claims   1 to 5, characterized in that the signal processing device (13) determines the difference of the entered value (TO T_ 1; T-1 T-2; Do D1; I_ 1 I-2).   ) Device according to any one of   claims 2 to 6, characterized in that the provision   signal processing system (13) performs a   deriving the values entered (To, T_ 1, T-2, D-0, D_   I, I-1, I_ 2) and / or determined differences (To - T-1; T-1 T-2; Do D-1; I-1 I-2).   Device according to claim 1,   characterized in that the duration of the time interval (F) is variable depending on the number of signals (50, S-1, S-2, S-3, S-4) -   9) Device according to claim 1,   characterized in that the influence depends on the signals (S)   arriving within a predetermined time segment mined (F).   ) Device according to any one of   preceding claims, characterized in that   the windscreen wiper (10), the driving means (11), the signal processing device (13) and the sensor (12) and the control device (14) can be mounted in a motor vehicle and the influence of the predetermined interval is made according to   the speed of movement of the motor vehicle.   ) Device according to any one of   1 to 10, characterized by a minimum duration of   male and / or maximum of the predetermined interval (I).