FR2784068A1 - WIPER INSTALLATION - Google Patents

Abstract

Wiper installation (10) comprising at least one wiper (14), driven by a motor (18), and able to move in a pendulum motion between two positions (21, 23) of reverse gear, and a control unit (20), connected to the motor (18). An acceleration sensor (22) is put on the wiper (14), and connected to the control unit (20).

Description

STATE OF THE ART The invention relates to a wiper installation

  as well as an operating method and a method

  optimization of such a wiper installation,

  taking at least one wiper driven by a motor and able to move in a pendulum movement between two

  reversing positions, and a control unit

linked to the engine.

  In the case of such known installations of

  one or more wipers are driven by a motor

  ice directly or by means of a wheelhouse and these move like pendulums on the wiping glass. In the

  optimization of such a wiper installation

  ice we must pay attention to many influences of the environment and many parameters of the system such

  that for example the formation of streaks as a function of the

  lift of rain or also of noise emission during the wiping process and in the end positions,

  so that during an optimization it is necessary to arrive

damally to a compromise.

  Advantages of the invention To this end, the present invention relates to a

  windscreen wiper installation characterized in that a detector

  acceleration sensor is put on the wiper and is connected to

the control unit.

  The advantage of installing wipers

  that the dynamic behavior of the wiper can be

  tect and corrected in each position. In this way, the highest possible wiping speed can be obtained in the driver's field of vision on the one hand, and the start-up controlled or adjusted from the reversing positions or from the rest position. At the base of the invention is the fact

  that it has been found that not only does the speed of the wiper

  ice on the glass but also its acceleration exerted a

  considerable influence on the parameters mentioned.

  According to other characteristics of the invention: * the control unit regulates the speed of rotation of the motor

  depending on the signal delivered by the acceleration detector

  tion; * in the control unit, a setpoint movement profile for the pendulum movement is deposited in a memory; * the control unit acts on the motor by correcting it by

  function of the values transmitted by the acceleration sensor

  ration When the values deviate from the values of the profile

  setpoint movements stored in memory.

  If the motor is controlled or adjusted directly

  by the signal delivered by the detector, we can react directly

  environmental influences, such as whether the ice is dry, wet or soaked, or also loaded

  of snow. The speed can be kept high in the zo-

  vision and be braked appropriately when the

  window soot reaches reverse positions. In this way it is possible that, despite the rapid passage over the vision zone, there does not occur an excessive jerk of the wiper even in the case where the friction would have low values at the positions of inversion of market. Tipping noise in the reverse positions is kept low by reducing speed or acceleration.

  If you register with the detector a

  setpoint movement wire for the pendulum movement and if it is put in a memory in the control unit it is

  possible to quickly obtain an optimal course of the

  compared to the actual movement. The control unit

  can then react directly to deviations.

  The invention also relates to a method of operation

  operation of a wiper installation, characterized in that: * an acceleration sensor is placed on the wiper, e the signals from the acceleration sensor are brought to a control unit, and * on use directly or treat the signals as

  adjustment variables for the movement of the wiper.

  If the differences are compared directly to

  wearing the optimal movement and if we correct the

  deviations in the shortest possible time, the process carried out

  movement is closely related to the opti-

motion sickness.

  The present invention further relates to a method

  optimization dice of the movement profile of a wiper installation comprising at least one driven wiper

  by a motor and able to move in a hanging movement-

  area between two reversing positions and a control unit connected to the motor, characterized in that * an acceleration sensor is put on the wiper, * the progress of the movement is recorded in different

  setpoint movement profiles in the control unit

order,

  * parameters such as noise, formatting are detected

  tion of streaks, or the behavior of the lips of the towel

ice when tilting, and

  * at least one setpoint movement profile is deposited op-

  timed on at least one parameter, in the control unit

  demand, movement profile according to which we can do

run the engine.

  With this process it is possible to realize a

  pre-setting for any test installation

  windscreen wipers, according to which the wiper installations

  in series work almost optimally. It is also possible to order the wiper installations

  thus optimized even without an acceleration sensor, the circuits

  surrounding constants which influence the course of the movement which cannot naturally be directly

  detected. Preferably for this reason we operate-

  ner a wiper system optimized in this way

  with an acceleration sensor.

  Drawings The present invention will be described below in more detail on the basis of an embodiment, represented in the appended drawings, in which: - Figure 1 schematically shows a wiper installation, and - the Figure 2 shows a diagram, on which we have represented

  the angular speed of the wiper as a function of the year

pendulum.

Description

  In Figure 1 there is shown an installation

  wiper 10 for a windshield 12 of a motor vehicle

  teur, in which two wipers 14 are driven by means of a wheelhouse 16 and a motor 18. The motor 18 is governed by a control unit 20. In operation the

  windshield wipers 14 perform a pendulum movement shown

  as long as a pendulum angle has between two reversing positions

  sion 21 and 23 of their movement. The lower inversion position 23 in this case also defines the rest position,

  which can however also take another position, for example

particularly lower.

  The wipers 14 are shown here schematically and are generally constituted by an arm

  that you can't see here and a blade

soot hinged above.

  On the wiper 14 we put an ac sensor

  celebration 22, connected by line 24 to the control unit

  20. The position of the detector 22 on the wiper depends

  others of his sensitivity. The highest speed pos-

  sible and for this reason also the greatest possible acceleration to be detected is in the area of the wiper tips. Putting the detector in this area would however be considered annoying on the one hand and would be

  unfavorable for the installation of line 24, in particular

  bind when changing the wiper blade.

  There is therefore a tendency to put the detector 22 also

  as close as possible to the center of rotation of the wiper 14. In FIG. 1 only a detector 22 has been shown on a single wiper 14. It is however also conceivable to put a detector 22 on each wiper

  14 and connect it to the control unit 20. The signals

  they would then be averaged or compared in the control unit so as to also be able to detect the failure of a

  wiper 14 or a detector 22. In the case of an ins-

  wiper assembly 10, which has a separate motor 18 for each wiper 14, each wiper 14 would be equipped with a detector 22, which would then be connected to the

  respective control of the corresponding motor.

  In operation the windshield wipers 14 perform a pendulum movement which corresponds to the angle c between the two reversal positions 21 and 23 and are in this case accelerated or slowed down at least in the area of the reversal positions of their gait. . The values of these accelerations or decelerations are detected by the detector 22 and delivered to the control unit 20, which in turn adjusts the motor 18 according to the signals. Adjustment methods of this type which influence, for example, the arrival of current to the motor and thus act on the speed of rotation of the motor, are known and will not be the subject of a study here.

more detailed description.

  It is also possible that the control unit 20 adjusts the motor 18 in a known manner and that the signal received from the detector 22 is only used to control

movement.

  The control unit 20 has a memory 26, in which is deposited at least one setpoint movement profile, determined empirically, for the movement

  pendulum. The signals received by the detector 22 are compared

  res in the control unit 20 with the values deposited from the profile of the reference movement, directly or after their processing, and this results in an adjustment variable with

  which influences the operation of the engine 18.

  During the operation of the installation of

  ice soot 10 we therefore use the transmi-

  its by the detector 22, placed on the wiper 14, to the control unit 20, in order to derive therefrom an adjustment variable for the movement of the wiper 14. In FIG. 2, we carried in a diagram of the setpoint movement profiles 28, 30, 32 in the form of an angular tilting speed as a function of the tilting angle. The profiles of the movements correspond in this case to the signals delivered by the detector 22 and prepared. We obtain the different profiles 28, 30 or 32 thanks to the fact that either the control of the motor 20 has been varied, or we have simulated different environmental conditions, such as having dry ice, ice wet or soaked ice. In this way a setpoint acceleration profile can then be chosen, a profile which constitutes an optimal compromise between the various parameters which represent the quality of the wiping, the noise emissions or

  other similar elements. But it is conceivable to depo-

  be in memory 26 several motion profiles 28, 30,

  32 and to pass according to the climatic conditions on the pro-

  appropriate wire of the setpoint movement 28, 30 or 32.

Claims (5)

R E V E N D I C A T I ON S   1) Windscreen wiper installation (10) comprising at least one windscreen wiper (14), driven by a motor (18), and able to move in a pendulum movement between two positions (21, 23) for reversing step, and a control unit (20), connected to the motor (18), characterized in that an acceleration sensor (22) is placed on the wiper   (14) and is connected to the control unit (20).   2) Wiper installation according to claim 1, characterized in that   the control unit (20) adjusts the speed of rotation of the motor   tor (18) as a function of the signal delivered by the detector acceleration (22).   3) Installation of wiper according to one of the claims   1 or 2, characterized in that   in the control unit (20) a movement profile is deposited   setpoint (28, 30, 32) for pendulum movement in a memory (26).   4) Installation of wiper according to claim 3, characterized in that   the control unit (20) acts on the motor (18) by correcting it   managing according to the values transmitted by the acceleration detector (22), when the values deviate from the values of the profile of the reference movements deposited in the memory (26).    ) Method of operating a wiper installation   window (10), comprising at least one wiper (14),   born by a motor (18), and able to move in one movement   pendulum between two positions (21, 23) of reversal of   che and a control unit (20) connected to the motor (18), characterized in that * an acceleration sensor (22) is put on the windscreen wiper, * the signals from the acceleration sensor are brought to a control unit (20), and the signals are used directly or processed as adjustment variables for the movement of the wiper (14).   6) Method for optimizing the movement profile of an ins-   windshield wiper assembly (10) comprising at least one wiper   glass (14), driven by a motor (18), and able to move   cer in a pendulum movement between two positions of invert-   running gear (21, 23) and a control unit (20) connected to the motor (18), characterized in that * an acceleration sensor (22) is placed on the wiper (14), * the progress of the movement is recorded in different   setpoint movement profiles (28, 30, 32) in the unit control tee (20),   * parameters such as noise, formatting are detected   tion of streaks, or the behavior of the lips of the towel   glass during their tilting, and * at least one target movement profile (28, 30, 32), optimized on at least one parameter, is deposited in the control unit (20), movement profile according to which one can run the engine (18).