JPH115514A - Automatic wiper controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the presence or absence of raindrop with accuracy and prevent an unpleasant wiper operation by calculating integrated raindrop amount that an increased amount of raindrop from a state that window glass by a wiper is left unwiped is integrated and deciding whether this integrated raindrop amount is larger than a prescribed value or not. SOLUTION: A raindrop sensor S forming a raindrop means is constituted of a raindrop detection part 6 and a control part 3. The differential arithmetic part 20 of the control part 3 detects a temporal increase/decrease of raindrop amount of the raindrop detection part 6. Whether the increase/decrease of the detected raindrop amount is positive or negative, that is, a temporal increase of raindrop amount is decided by a positive or negative decision part 21. Further, operating speed of a wiper 2 is controlled by a wiper control part 23 by temporally integrating increased amount of raindrop amount, of the decision output of the positive or negative decision part 21, by a raindrop amount integrating arithmetic part 22, and depending on whether integrated raindrop amount from a state that window glass 1 is left unwiped due to degradation of the wiper 2 is larger than a prescribed value or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic wiper control device for automatically wiping raindrops adhered to window glass (window glass) of vehicles, ships, aircrafts and the like.

[0002]

2. Description of the Related Art Conventionally, in an automatic wiper control device,
There is one described in JP-A-61-37560. In this conventional apparatus, the presence or absence of raindrops on a window glass is determined, and when it is determined that raindrops are present, a wiper is automatically operated. The presence or absence of raindrops in the conventional device is detected and determined by the following raindrop detection device. Specifically, in the above-described conventional device, light is incident on the window glass by the light emitting element and reflected by the window glass by utilizing the fact that the transmittance of the window glass is different when there is no raindrop on the window glass. The amount of raindrop adhering to the window glass is detected by detecting the amount of light emitted by the light receiving element.

The condition for automatically activating the wiper is as follows. First, in a state where no raindrop is attached to the window glass, a reference value which is a reference value of the amount of raindrop is determined based on the amount of light received by the light receiving element. Then, the difference between the detected value of the light receiving element and the reference value is compared with a predetermined threshold value. Then, in the above-described conventional apparatus, the following is performed in order to prevent the wiper from malfunctioning (the wiper does not stop) due to the wiping of raindrops due to the deterioration of the wiper.

In the conventional apparatus, the reference value is an output value of the light receiving element after the wiping of the raindrops on the window glass. Specifically, the wiping position of the wiper is set to a predetermined position during the wiping of the wiper. In this state, the detected value of the light receiving element in this state is set as the reference value. Therefore,
In the above conventional technique, the reference value is sequentially updated while the wiper is being wiped. As a result, even if the rain stops and there is a sweep of raindrops, the reference value is updated accordingly,
The wiper can be stopped accurately.

[0005]

However, according to the study of the present inventor, according to the prior art, the reference value is updated every time the wiper reaches a predetermined position as described above. It turns out that a problem arises. For example, it is assumed that when the rain is raining and the wiper is automatically controlled and the wiper wipes the raindrop, the wiper is greatly deteriorated and the windshield is wiped off by the raindrop. In this case, in the conventional device,
The reference value is set according to the state where the raindrop has been swept. Therefore, after this, when the wiper of the raindrop dries, for example, when a little rain falls, there is a problem that the presence or absence of the raindrop cannot be detected and the wiper does not operate.

Accordingly, an object of the present invention is to provide an automatic wiper control device capable of detecting raindrops accurately without being affected by the wiping of raindrops.

[0007]

The present invention employs the following technical means to achieve the above object. According to the invention of claims 1 to 4, the raindrop amount integrating means (S1) calculates the integrated raindrop amount (F1) by integrating the increment of the raindrop amount (F) detected by the raindrop detecting means (S) with respect to time. S10
0) and when the integrated raindrop amount (F1) calculated by the raindrop amount integrating means (S100) is larger than a predetermined value (F2), it is determined that raindrops are attached to the window glass (1), and the raindrop amount integrating means is determined. Integrated raindrop amount (F1) calculated in (S100)
Is smaller than the predetermined value (F2), it is determined that there is no raindrop on the window glass (1).
0) and when it is determined that the raindrops are present by the raindrop presence / absence determination means (S110), the wiper (2) is automatically controlled to operate, and no raindrops are adhered by the raindrop presence / absence determination means (S110). The automatic control means (S130, S15) for automatically controlling and stopping the wiper (2).
0).

Accordingly, even if the windshield wiper is deteriorated and the windshield is wiped, the raindrop amount integrating means calculates the integrated raindrop amount obtained by integrating the increase amount of the raindrop from the state of the wiper. Further, the raindrop presence / absence determination means determines whether or not the accumulated raindrop amount is greater than a predetermined value, thereby determining whether or not raindrops have adhered to the window glass. As a result, the presence or absence of raindrops can be accurately detected without being affected by the wiping of the raindrops, and the automatic control of the wiper can be accurately performed.

In addition, the raindrop presence / absence determining means determines whether or not the accumulated raindrop amount is larger than a predetermined value.
When the amount of increase in the raindrops is so small that the occupant does not know, the wiper does not have to be wiped off, and the uncomfortable operation of the wiper for the occupant can be prevented. Further, in the invention according to claim 2, the raindrop amount integrating means (S100) is configured such that the wiper (2) passes through the detecting portion (2A) corresponding to the detection of the raindrop detecting means (S), and the windshield (1) is provided. ), The accumulated raindrop amount (F1) is accumulated during a predetermined time from when the wiper (2) passes through the detection portion (2A) again from the wiping state in which the raindrops attached to (2) are wiped.

By the way, for example, the wiper collects raindrops attached to the window glass and moves the raindrops to the detection site. Therefore, when a raindrop is detected by the raindrop detection means at the detection site, the amount of raindrop may not be the actual amount of raindrop. Therefore, in this case, when the integrated amount of raindrops is integrated, the integrated amount of raindrops becomes extremely large, and the accuracy of the automatic wiper control is significantly deteriorated.

Therefore, according to the second aspect of the present invention, the raindrop amount integrating means (S100) is configured such that the wiper (2) passes through the detecting portion (2A) corresponding to the detection of the raindrop detecting means (S). From the wiping state in which the raindrops attached to the window glass (1) have been wiped, the wiper (2)
Since the accumulated raindrop amount (F1) is accumulated during a predetermined time before passing through A) again, the raindrop amount accumulation means does not accumulate the raindrops collected by the wiper. As a result, the accuracy of the automatic wiper control can be improved.

In the invention according to claim 3, the integrated raindrop amount (F1) integrated by the raindrop amount integrating means (S100).
And an operating speed control means (S120) for controlling the operating speed of the wiper (2) to increase as the value of the wiper (2) increases. By this, by this,
By changing the operating speed of the wiper in accordance with the amount of raindrops attached to the window glass, the visibility of the window glass can always be maintained in a good state.

[0013]

Embodiments of the present invention will be described below. FIG. 1 shows a schematic block diagram of the automatic wiper control device. In this embodiment, the automatic wiper control device is applied to a vehicle. As shown in FIG. 1, the automatic wiper control device includes a wiper 2 for wiping raindrops attached to a window glass 1 of a vehicle, and a control device 3 for controlling the operation of the wiper 2.

As shown in FIG. 1, two wipers 2 are provided so as to be arranged in the vehicle width direction, such as wipers 2a and 2b, and their wiping ranges are indicated by A and B in the figure. I have. As shown in FIG. 1, the wipers 2a and 2b have a wiping range that partially overlaps the window glass 1 at the center. By doing so, the wiping range of the wiper 2 with respect to the surface area of the window glass 1 is increased. Further, by doing so, the raindrops wiped by the wiper 2a and flowing into the wiping range B of the wiper 2b are surely wiped by the wiper 2b. In the wipers 2a and 2b, the lower part of the window glass 1 is located at the storage position 2 at one end of the wiping ranges A and B.
It is R. In the wiping range A of the wiper 2a, the other end where the operation of the wiper 2a is reversed is defined as a position 2B.

The raindrop sensor S serving as raindrop detection means comprises a raindrop detection section 6 and a control section 3, and the control section 3 constitutes a well-known computer means (CPU) having a built-in recording medium such as RAM and ROM. ing. An output terminal of the control unit 3 is connected to a wiper motor 4 which is an electric drive unit for driving the wiper 2. The wiper motor 4 is controlled by the control unit 3 through a drive circuit 5.

As shown in FIG. 1, a wiper switch 7, which is a switch means for setting the automatic control of the wiper 2 to start and stop, is connected to the control unit 3 as an input terminal.
The setting position of the wiper switch 7 can be set by an occupant. Specifically, the wiper switch 7 has an off state for stopping the wiping of raindrops by the wiper 2,
Auto for automatically controlling the wiping by the wiper blade 2, Lo for setting the operation (cycle) of the wiper 2 to low speed operation, Int to set the operation (cycle) of the wiper 2 to intermittent operation, and high-speed operation for setting the operation (cycle) of the wiper 2 There is a Hi setting position to be set.

That is, in the present embodiment, when the wiper switch 7 is set to the automatic mode, the rain sensor S
The wiper 2 is automatically controlled based on the detected value (raindrop information). In this embodiment, when the ignition switch 31 shown in FIG. 1 is turned on and the wiper switch 7 is set to auto, C
Electric power is supplied from the vehicle-mounted power supply 30 to the PU 4 and the raindrop sensor S, and automatic control described later is performed.

Next, the raindrop detector 6 of the raindrop sensor S will be described with reference to FIGS. Since the structure of the raindrop detector 6 is substantially the same as that of Japanese Patent Application Laid-Open No. 61-37560, the description will be simplified. Raindrop detector 6
Is located in the wiping range A of one of the wipers 2a and 2b (2a), at the other end side between the storage position 2R and the other end 2B, at a position 2A (detection site) in FIG. Have been. Further, the raindrop detector 6 is installed at a substantially central portion in the vehicle width direction and an upper portion of the window glass 1 as shown in FIG.

The reason for this is that, for example, if the raindrop detector 6 is provided at an intermediate portion in the vertical direction, it obstructs the view of the driver and the front passenger. Further, for example, if the raindrop detecting unit 6 is installed in a lower part of the wiping range A of the window glass 1, the raindrop detecting unit 6 easily enters the driver's field of view and becomes an obstacle. In addition, a rearview mirror (not shown) is usually installed in a central portion in the vehicle width direction and above the window glass 1. Therefore, by installing the raindrop detector 6 at the center and upper part of the window glass 1 in the vehicle width direction, in the present embodiment,
The raindrop detection unit 6 does not hinder the occupant's view, and there is not much discomfort.

As shown in FIG. 2, the raindrop detector 6 is mounted on the inner surface of the window glass 1. Then, the raindrop detecting unit 6 in the present embodiment makes the light (infrared light) by the LED 8 (light emitting diode that emits infrared light, hereinafter, LED) enter the window glass 1 and reflects this light on the window glass 1, This reflected light is received by a light receiving element
(Photodiode) 9 to receive light.
The amount of raindrops adhering to the window glass 1 is detected based on the amount of the reflected light.

That is, the raindrop detector 6 detects that when raindrops adhere to the window glass 1, the reflectance at the window glass 1 changes (decreases) and the amount of light received by the photodiode 9 decreases. The amount of raindrops is detected using this.
When the automatic control is started by the control unit 4, the LED 8 is energized by the vehicle-mounted power supply 30 to emit light. The output value of the photodiode 9 is
Light-to-voltage conversion is performed by a detection amplification circuit (not shown),
The information is input to the control unit 3.

The raindrop detector 6 is installed in one of the two wipers as shown in FIG. 1 and within the wiping range of the wiper 2, and the raindrop detector 6 is arranged as shown in FIG. It is installed inside the cabin. The raindrop detector 6 is provided with a prism 10 which is a transmission member for refracting the light of the LED 8 on the inner surface side of the window glass 1 so that the light from the LED 8 is surely incident on the photodiode 9 as shown in FIG. ing. This prism 10
Is attached to the window glass 1 by a transparent adhesive 17.

The prism 10 is provided in the window glass 1.
Is reflected by the photodiode 9 and reflected by the photodiode 9. Thereby, for example, the wind glass 1
When no raindrops have adhered, the infrared light from the LED 8 passes through the prism 10 and is totally reflected on the inner surface of the window glass 1 as shown in FIG. Then, the totally reflected infrared light is totally reflected by the prism 10 as shown in FIG.

On the other hand, if raindrops adhere to the window glass 1, for example, the infrared rays from the LED 8 pass through the prism 10 and are not totally reflected on the inner surface of the window glass 1 as shown in FIG. Decrease the amount of infrared light. In FIG. 2, reference numeral 11 denotes a base for holding the LED 8 and the photodiode 9, and 12 denotes the LE.
It is a drive circuit (not shown) for driving D89 and an electric circuit unit having the above-described detection and amplification circuit.

The LED 8, the photodiode 9, the base 11, and the electric circuit 12 are housed and integrated in the cover cases 13a, 13b. And the raindrop detector 6 integrated in this way is
It is fixed to the inner surface of the window glass 1 by an adhesive 14 or the like. Next, the function of the control unit 3 will be described with reference to FIG.

In this embodiment, the control unit 3 includes a differential operation unit 20 for detecting a temporal increase and decrease of the detection value (raindrop amount) of the raindrop detection unit 6, and a detection (operation) performed by the differential operation unit 20. ) Has a positive / negative determination unit 21 (increase detecting means) for determining whether the increase or decrease of the raindrop amount is positive or negative, that is, the raindrop amount increases with time. The control unit 3 further includes a raindrop amount integration calculation unit 22 (raindrop amount integration means) that integrates the increase amount ΔF of the raindrop amount temporally to calculate an integrated raindrop amount F1 among the outputs of the positive / negative determination unit 21; A wiper control unit 23 that controls the operating speed of the wiper 2 according to the integrated raindrop amount F1 calculated by the raindrop amount integration calculation unit 22 is provided. The wiper control unit 2
Reference numeral 3 has a reset function for resetting the increase amount ΔF and the accumulated raindrop amount F1.

Further, as shown in FIG. 1, the control section 3 has a judgment prohibition signal in the positive / negative judgment section 21, that is, a judgment prohibition signal creating section 24 for prohibiting the calculation of the integrated raindrop amount at a timing described later. . Next, the contents (automatic control of the wiper) of the functional units 20 to 24 will be described with reference to the flowchart shown in FIG. Note that this flowchart is executed when the wiper switch 7 is set to auto when the ignition switch 40 of the vehicle is turned on as shown in FIG. In the present embodiment, the control cycle of this flowchart is also sufficiently shorter than one wiping cycle of the wiper 2 described later, and is, for example, about 4 ms.

When the wiper switch 7 is set to auto, the flowchart of FIG. 2 starts. Then, first, in step S50, initialization processing of data and the like is performed.
Then, in step S60, the windshield 1 is wiped by operating the wiper 2 only once. Here, one wiping means that the wiper 2 returns from the storage position 2R to the storage position 2R.

By doing so, it is possible to ensure that there is no raindrop on the window glass 1 at the beginning of the automatic wiper control. Next, when the wiper 2 returns to the storage position 2R, the process proceeds to step S70, where the raindrop sensor S detects the amount F of raindrops attached to the window glass 1 and reads and stores it. Then, the process proceeds to step S80, and it is determined whether the raindrop amount F has increased from the raindrop amount F stored in the previous step S70.

If the result of the determination in step S80 is YES, that is, if the amount F of raindrops has increased,
In step S100, an integrated raindrop amount F1, which is an integrated value of the increase amount ΔF of the raindrop amount, is calculated. Then, step S11
At 0, it is determined whether or not the accumulated raindrop amount F1 is larger than a predetermined value F2. If the result of the determination in step S110 is YES, it is determined that raindrops have adhered to the window glass 1 to an extent that hinders the occupant's view, and the wiper 2 wipes the window glass 1 in step S12.
0, and proceed to S130.

First, in step S120, the wiper mode is set according to the accumulated raindrop amount F1. Here, in the present embodiment, in the automatic control of the wiper, a mode manually set by the wiper switch 7, that is, Int, in which the operation (cycle) of the wiper 2 is set to the intermittent operation, the operation of the wiper 2 ( One of three is set, Lo, in which the cycle (cycle) is low-speed operation, and Hi, in which the operation (cycle) of the wiper 2 is high-speed operation. Then, in step S120, the wiper mode is set so that the operating speed of the wiper 2 increases as the cumulative raindrop amount F1 increases.

Then, the process proceeds to step S130, and the wiper 2 is operated so as to be in the wiper mode set in step S120. Step S110
It is determined that the accumulated rain amount F1 is smaller than F2.
That is, when almost no raindrops adhere to the window glass 1, the process proceeds to step S150, and the wiper 2 is stopped. Then, in step S140, step S120
In accordance with the set wiper mode, a prohibited time range in which the detection of the raindrop amount F, the calculation of the increase amount ΔF, and the integration of the integrated raindrop amount F1 are prohibited during the operation of the wiper is set.

In this embodiment, the reference time is 0 when the wiper 2 is at the storage position 2R, T is one cycle time when the wiper 2 returns from the storage position 2R to 2R, and T is the time from the storage position 2R to the position 2A. Let t be the time after passing from the storage position 2R through the position 2A and reaching the position B, and then returning to the position 2B again. In the present embodiment, assuming that T1 is the time elapsed from the position 2A to the position 2A, that is, the elapsed time from the reference time, at t <T1 <u, detection of the raindrop amount F, calculation of the increase amount ΔF, In addition, the accumulation of the accumulated raindrop amount F1 is prohibited.

In other words, when the wiper 2a operates to be between the position 2A and the position 2B, the detection of the raindrop amount F, the calculation of the increase amount ΔF, and the integration of the integrated raindrop amount F1 are prohibited. Note that t and u can be easily determined according to the wiper mode. Then, in step S160, it is determined whether the elapsed time T1 satisfies t <T1 <u,
If the determination is YES, the process returns to step S70. If NO is determined in the step S160, the process proceeds to a step S17.
Go to 0. In step S170, the raindrop amount F, the increase amount ΔF, and the integrated raindrop amount F1 are reset.

Next, the operation of this flowchart will be described. For example, it is assumed that the occupant has set the wiper switch 7 to auto after raining. Then, the wiper 2 is wiped once in step S60. As a result, the raindrops adhered to the window glass 1 are wiped off, and the window glass 1 is brought into a dry state (there is a blowout).

Next, in step S70, the raindrop amount F is read and stored, and in step S80, it is determined whether the raindrop amount F has increased. In this description, since there is only one data stored in step S70, an increase in the amount of raindrops cannot be detected, and in this case, the process proceeds to step S110. In step S110, it is determined whether the accumulated raindrop amount F1 is smaller than a predetermined value F2. Here, since the accumulated raindrop amount F1 is 0, the process proceeds to step S150, and the wiper 2
Is still stopped.

Then, returning to step S70 again, when the amount of raindrop F is detected, the amount of raindrop F detected this time in step S80 increases from the amount of raindrop F previously stored.
YES is determined in the step S80, and the step S10
Go to 0. Then, the increase amount ΔF is integrated. Thereafter, in step S110, the accumulated raindrop amount F1 is determined. If the accumulated raindrop amount F1 is larger than F2, step S1 is performed.
At 20, the wiper mode is set, and step S130
The wiper 2 operates. Further, in the present embodiment, the wiper mode is switched according to the integrated raindrop amount F1, but this switching is always performed after the wiper 2a reaches the storage position 2R.

As described above, in the present embodiment, when the integrated raindrop amount F1 obtained by integrating the increase amount ΔF of the raindrop is larger than the predetermined value F2, it is determined that the raindrop has adhered to the window glass 1, and the wiper 2 is operated. On the other hand, if the integrated raindrop amount F1 obtained by integrating the increase amount ΔF of the raindrop is smaller than the predetermined value F2, it is determined that no raindrop is attached to the window glass 1, and the wiper 2 is stopped.

That is, in the present embodiment, even if the wiper 2 is deteriorated and the windshield 1 is wiped, the increase amount ΔF of raindrops from the state of the wiper is calculated. Based on the integrated value (integrated raindrop amount F1), it is determined whether or not raindrops adhere to the window glass 1. Therefore, without being affected by the wiping of raindrops,
Presence or absence of raindrops can be accurately detected.

In addition, in this embodiment, the wiper 2 is not actuated immediately when the raindrops increase, but it is determined whether or not the accumulated raindrop amount F1 is larger than a predetermined value F2. When ΔF is too small to be recognized by the occupant, the wiper 2 does not need to be wiped, and the uncomfortable operation of the wiper 2 for the occupant can be prevented.

In this embodiment, the increase amount ΔF of the raindrop amount F is integrated to calculate the integrated raindrop amount F1, and the wiper mode is set according to the integrated raindrop amount F1. Thereby, the wiper 2 operates in a predetermined mode. Accordingly, the speed of the wiper 2 is varied according to the amount of raindrops attached to the window glass 1, so that the field of view of the window glass 1 can always be maintained in a good state.

By the way, when the wiper 2 operates as described above, in the present embodiment, as described above, while the wiper 2a is reversed from the position 2A to the position 2B and returns to the position 2A, the raindrop amount F, The increase amount ΔF and the integrated raindrop amount F1 are reset. Therefore, such detection of the raindrop amount F, calculation of the increase amount ΔF, and calculation of the integrated raindrop amount F1 are performed while the wiper 2a is located between the storage positions 2R and 2A in FIG.

That is, the integration of the increase amount Δ is based on the wiping of the wind glass 1 in which the wiper 2 has passed through the detection site 2A corresponding to the detection of the rain drop detection unit 6 and has wiped the rain drops attached to the window glass 1. From the state, the operation is performed during a predetermined time before the wiper 2a passes through the detection site 2A again. The reason for this will be described below. In the present embodiment, the raindrop detector 6 is located at the center and above the window glass 1 so that the raindrop detector 6 does not hinder the occupant's view of the raindrop detector 6 as described above. A is installed on one end side. Then, for example, when the wiper 2a operates from the storage position 2R to 2A, the wiper 2a moves the raindrop to 2A so as to collect the raindrop attached to the range from 2R to 2A. Therefore, when the raindrop sensor S detects a raindrop at the position 2A, the raindrop amount that is attached to most of the wiping range A is detected instead of the actual raindrop amount F. As a result, the increase amount ΔF of the raindrop becomes very large, and the accuracy of the automatic wiper control is significantly deteriorated. Further, there is a similar problem when the wiper 2a reaches the position 2A from the position 2B where the operation is reversed.

Therefore, in the present embodiment, the integration of the increase amount Δ is performed during a predetermined time before the wiper 2 of the window glass 1 passes through 2A and passes through the detection portion 2A again. As a result, the accumulated raindrop amount F1 is accurately calculated, and the accuracy of the automatic wiper control is significantly improved. Further, in the present embodiment, since the raindrop detector 6 is installed at one end of the wiping range A, the time required to reach the position 2B from the position 2B where the operation of the wiper 2a is reversed is very small.
Therefore, it is difficult to detect the increase amount ΔF of the raindrop between the position 2B and the position 2B and the position 2B and the position 2B during this short time, and the accuracy of the automatic wiper control is significantly deteriorated.

Therefore, in the present embodiment, after the wiper 2a passes through the detection site 2A, until the wiper 2a passes through the detection site 2A again, the integration of the increase ΔF is not integrated, and the presence or absence of the raindrop in step S110 is determined. Judgment is prohibited.
In the present embodiment, when the wiper 2a operates from the position 2B to the position 2R, the detection of the raindrop amount F and the integration of the increase amount ΔF1 are performed from 2A to the reference position 2R. As a result, in the present embodiment, the integrated raindrop amount F1 is accurately calculated, and the accuracy of the automatic wiper control is significantly improved.

(Other Embodiments) In the above embodiment, the raindrop detector 6 is located at the center of the window glass 1 and the wiper 2a.
Is set in the wiping range A, but may be set in the wiping range B, or may be arranged in a portion where the wiping ranges A and B overlap. In the above embodiments, the automatic wiper control unit is applied to a vehicle, but the present invention can be applied to a ship, an aircraft, and the like.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of an automatic wiper control unit according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a raindrop detection unit in the embodiment.

FIG. 3 is a flowchart showing control contents of a CPU in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Window glass, 2 ... Wiper, 3 ... Control part, 6 ...
Raindrop detector.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Satoru Maeno 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation

Claims (4)

[Claims] 1. A wiper (2) for wiping raindrops attached to a window glass (1) of a vehicle, and a raindrop amount (F) installed in a wiping range of the wiper (2) and attached to the window glass (1). And a raindrop detecting means (S) for detecting the amount of raindrops (F) detected by the raindrop detecting means (S). A raindrop amount integrating means (S100) for calculating an integrated raindrop amount (F1); and if the integrated raindrop amount (F1) calculated by the raindrop amount integrating means (S100) is larger than a predetermined value (F2). It is determined that raindrops have adhered to the window glass (1), and if the integrated raindrop amount (F1) calculated by the raindrop amount integrating means (S100) is smaller than a predetermined value (F2), raindrops are applied to the window glass (1). Judge that there is no adhesion When the presence / absence of raindrops is determined by the raindrop presence / absence determination means (S110) and the raindrop presence / absence determination means (S110), the wiper (2) is automatically controlled to operate, and the raindrop presence / absence determination means (S110) An automatic control means (S130, S150) for automatically controlling and stopping the wiper (2) when it is determined that no raindrops adhere. 2. The raindrop amount integrating means (S100) is configured such that the wiper (2) passes through a detection portion (2A) corresponding to the detection of the raindrop detection means (S), and the windshield (1) is provided. The integrated raindrop amount (F1) is integrated during a predetermined time before the wiper (2) passes through the detection portion (2A) again from a wiping state in which raindrops attached to the wiping surface are wiped. Item 6. An automatic wiper control device according to Item 1. 3. An operation speed control means (S120) for controlling the operation speed of the wiper (2) to increase as the integrated raindrop amount (F1) integrated by the raindrop amount integration means (S100) increases. 3. The automatic wiper control device according to claim 1, wherein: 4. A switch means (7) for setting the start and stop of the automatic control of the wiper (2). When the automatic control is started by the switch means (7), the wiper (2) must be set. 4. The automatic wiper control device according to claim 1, wherein the window glass (1) is wiped once in (1).