JPH0978940A - Opening and closing device for automotive power window - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce wind noise in opening and closing a window while traveling at high speed and to enhance confortableness in the interior space of the automo bile by providing a noise level detecting part, a detecting part for detecting that the open width of the window is not more than a predetermined value, and a control part for varying the voltage applied to an electric motor. SOLUTION: A motor 3, a drum part 4, a wire 5, a guide rail 6, and a slider 13 are disposed as mechanisms for driving glass 14. The operation of the motor 3 is controlled by a voltage outputted from a control part 10 to which a limit switch 8 and a microphone part 9 are connected. The microphone part 9 is used to detect wind noise during driving. Then the voltage applied to the electric motor 3 for a power window is varied depending on the detected values to properly control the speed at which the window is opened and closed. Thus comfort can be enhanced in opening and closing the window glass.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of noise comfort when opening and closing windows of an automobile during high speed traveling.

[0002]

2. Description of the Related Art As a conventional vehicle power window opening / closing device, there is one disclosed in, for example, Japanese Patent Laid-Open No. 6-212857. This is for facilitating fine adjustment of the glass position when you want to open the window a little for ventilation, for example, the drum around which the wire that raises and lowers the windshield is wound is The wire is wound around the small diameter part between the fully closed state and the slightly opened state, resulting in a relatively slow ascending / descending speed. It is the lifting speed.

[0003]

However, in such a conventional power window opening / closing device for an automobile, the ratio of the slow ascending speed to the fast ascending / descending speed depends on the diameter ratio of the small diameter portion and the large diameter portion of the drum. Since the structure is uniquely determined, if the diameter of the small diameter part of the drum is reduced to increase the speed change ratio, the wire becomes slippery and the wire becomes damaged due to bending damage. On the contrary, if the large diameter part is enlarged, the size of the device becomes too large and the rotation torque of the motor becomes insufficient.Therefore, it is difficult to increase the speed ratio between low speed and high speed. there were.

In order to solve the above-mentioned conventional problems, the present invention aims to improve the comfort of wind noise when opening and closing windows during high-speed driving, and is based on ergonomic comfort noise characteristics. In order to realize the above, it is an object of the present invention to provide a power window opening / closing device for an automobile that can appropriately control the opening / closing speed of a window by using the noise level of a noise detection microphone.

[0005]

In order to solve the above-mentioned problems, the present invention is directed to a vehicle equipped with a power window for an automobile which opens and closes a window by an electric motor, in which a noise level detecting section and a window opening width are predetermined. It has a detection unit that is less than or equal to a value, and a control unit that changes the voltage applied to the electric motor of the power window.

[0006]

The noise detecting section detects the noise level of the wind noise during traveling, the detecting section detects the opening width of the window, and the voltage applied to the electric motor of the power window is changed according to these detected values. By doing so, the opening / closing speed of the window is properly controlled.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention.

First, the structure will be described. The door 1 has a glass 14 which is guided by the front channel portion 2a and the rear channel portion 2b of the glass to move up and down. A motor 3, a drum portion 4, a wire 5, a guide rail 6 and a slider 13 are arranged as a driving mechanism for the glass 14, and the drum portion 4 around which the wire 5 is wound is rotated by the operation of the motor 3 to move the slider. The glass 14 is opened and closed by moving 13 up and down. The motor 3
The operation of is controlled by the output voltage from the control unit 10 to which the limit switch 8 and the microphone 9 are connected. The limit switch 8 has a roller portion 8a and a slider 13
Is operated (for example, changed from OFF to ON) within the remaining 30 mm to the upper limit position, that is, the position where the glass 14 is fully closed.

The microphone 9 is arranged on the rear end side of the inner panel 1b of the door 1 and outside the weather strip rubber to detect the sound outside the vehicle.

Incidentally, as shown in FIG.
Includes a high-pass filter 12 that passes only high frequency components of the noise signal from the microphone 9.

Next, the operation will be described.

FIG. 5 is a flowchart showing the flow of processing in this apparatus. First, when the calculation is started, it is determined whether the window opening width is within 30 mm, and if YES, the noise level is read from the signal from the microphone 9,
The difference ΔL from the reference level stored in advance is calculated. The reference level at this time is a value that should be appropriately set for each vehicle type, but it is preferable to set the level detected by the microphone 9 when traveling at about 50 km / h to 80 km / h. . For example, if the level when driving at 50 km / h is set as the reference level, it will be about 50 km.
When the vehicle speed is equal to or higher than / h, the device operates substantially, and in this case, the device changes the opening / closing speed of the glass corresponding to the vehicle speed from 50 km / h to 100 km / h. .

That is, 50k outside the vehicle experimentally obtained
Since the difference between the m / h aerodynamic noise level and the 100 km / h aerodynamic noise level is, for example, about 18 dB, the coefficient K = 0.167 is set and X = ΔL corresponding to the increase of ΔL from 0 to 18. The correction value X is calculated as × K. However, in an actual traveling environment, the noise detected by the engine and tires and the noise generated by another vehicle weaken the vehicle speed dependency of the level detected by the microphone 9, and the change in ΔL becomes gentle.
To 12 dB, the coefficient K is set to 0.25. As a result, X takes a value of 0 to 3.

Next, the target opening / closing speed Y ₂ is calculated. In this step, the maximum value Y ₁ of the opening / closing speed of the glass is 1+
Because it calculates a value obtained by dividing X, Y ₂ takes a value of Y ₁ ~Y _1/4.

[0016] In the next step, calculating a target voltage V ₂ for opening and closing the glass at the target closing velocity Y _2. The relationship between the voltage and the glass opening / closing speed is determined by the specifications of the motor, the gear ratio, the diameter of the drum, etc.
Many open and close at a speed of 0 mm. This speed is 1/4
The explanation of the present apparatus will be made assuming that it can be doubled. The power window motor 3 is a DC motor and has a voltage V
And the glass opening / closing speed are approximately proportional to each other, as shown in FIG.

In FIG. 6, only one of the forward rotation and the reverse rotation of the motor is shown, and V ₀ is the minimum necessary voltage for the motor to overcome mechanical resistance such as frictional force to open and close the glass. (Absolute value). V ₃ is a voltage at which the glass opening / closing speed is 1/4 times Y ₁ . Y ₀ is a virtual opening / closing speed when the voltage V = 0. From these relationships, the target opening / closing speed Y ₂ is calculated as Y ₁ / (1 + X),
Next, the target voltage V ₂ is V ₂ = V ₁ × (Y ₂ −Y ₀ ) / (Y
₁ −Y ₀ ).

Next, it is judged whether the calculated V ₂ is larger than V ₃ . If NO to V ₂ = V ₃ with the V ₃ in place of the calculated value of V _2. If YES, leave V ₂ unchanged. The V ₂ thus obtained is controlled so as to be applied to the motor 3.

The above procedure is repeated. As a result, as the speed becomes higher and the noise becomes louder, the opening / closing speed near the start of opening the window is controlled to become slower.

Here, the first reason why the high frequency noise is extracted and used for the determination in the present apparatus by using the high pass filter 12 which passes only the high frequency component of the noise signal from the microphone 9 will be described. The environment in which a car runs is a quiet environment, for example, a very noisy environment when driving at low speed and constant speed in a residential area at midnight.
For example, the range of the noise level is actually large even when the vehicle is running in parallel with a large dump truck in a tunnel. Considering such a situation, the high-frequency noise is the result of selecting the noise that shows the closest change to the level of the wind noise generated aerodynamically.
It has been experimentally confirmed that it is the high frequency components that strongly depend on changes in wind speed.

Next, the improvement of comfort by this device will be described from an ergonomic point of view. Human hearing is adaptable to a wide range of sound levels, from the sound of flying insects to the loud noise of a jet taking off. Also, human hearing is highly sensitive to changes. It has the property of being able to get used to a certain level of sound, but being sensitive to changing sounds. For this reason, when the window is opened during ventilation at high speed, for example, for ventilation during smoking, the noise abruptly becomes loud, which makes it more annoying than the actual noise level rise. FIG. 7 shows the result of measuring the relationship between the window opening allowance and the noise level up to the occupant's ear position at a speed of 100 km / h in a commercially available automobile. It can be seen that in the range of the window opening margin of 0 to 100 mm, the highest level rise occurs between 10 mm and 20 mm. This car is about 5 per second
Since the glass ascending / descending speed is 0 mm, it takes only 0.2 seconds from the moment when the glass opens 10 mm to the time when it opens 20 mm. When a large noise level increase of 20 dB or more occurs in such a short time, a person feels that the noise becomes louder even after the 20 mm position where the level increase becomes gentle. And in this figure, 20m
It is felt that the maximum noise was generated in the vicinity of m to 30 mm. This is called sensory overshoot.

In order to improve this, it is effective to moderate the increase in noise level. The noise level shown in FIG. 7 is an OA level including low to high frequencies, but in the experiment at this time, analysis is also performed for each 1/3 octave band. As a result, it has been found that the cause of this level increase is the level increase of the high frequency component in particular. This is the second reason for using the level of high frequency noise for judgment. Therefore, by detecting high-frequency noise with the microphone 9 and slowing down the glass accordingly, the change in the noise level can be appropriately moderated, and overshoot of the sense is prevented.
The degree of annoyance can be reduced and comfort can be improved.

In this apparatus, the glass opening / closing speed is changed according to the noise level when the window opening width is within 30 mm, but it is not distinguished whether the glass is rising or falling.
As described above, the effect of opening a window is to reduce the harshness of sound. On the other hand, there is also an effect when the window is closed, which will be described below. Recent automobiles are highly airtight, and when the windows are closed, the air pressure inside the vehicle suddenly rises, and the pressure difference between the inside and outside of the eardrum causes a feeling of pressure on the ears. The higher the speed is, and the stronger the headwind is, the stronger the pressure on the ears becomes, and the more discomfort occurs. This phenomenon is because there is a slight time delay until the pressure inside the eardrum rises to the same level as the external pressure because the ear canal that has the effect of making the inside of the eardrum the same as the external pressure is thin. .

Therefore, when the glass rising speed becomes slow when the glass is completely closed by this device, the rise in atmospheric pressure in the vehicle compartment slows down, so that the pressure difference between the inside and outside of the eardrum does not become large. As a result, the discomfort due to the pressure on the ear is not felt. This is the effect of this device when closing the window.

If the microphone 9 as the noise detector collects the sound from the audio speaker mounted on the door, the operation of the present apparatus occurs even when the vehicle is stopped, so the microphone 9 collects the sound from the audio speaker. It is necessary to make it difficult to make noise. In the first embodiment, the surface for detecting sound is arranged outside the weather strip 15 of the door and outside the door 1, so that the sound emitted from the audio speaker attached to the door into the vehicle interior is also generated. It is difficult for the microphone 9 to collect the sound muffled inside the door 1.

The place where the microphone 9 is arranged is changed to the door mirror 11.
The second embodiment is provided inside. Door mirror 1
Since 1 is located at a position where the wind from running directly hits, aerodynamic noise can be collected fairly purely, so that there is an advantage that the operation error of this device due to other noise can be made very small.

The third embodiment is applicable to the case where no audio speaker is attached to the door. It is one in which a microphone 9 is attached to the control unit 10. In this case, the microphone 9 picks up the noise inside the door 1 so that the aerodynamic noise level can be known. In this example, it is possible to obtain the merits of omitting wiring due to the integration of parts and simplifying the assembly process.

In the fourth embodiment, instead of omitting the procedure for judging whether the window opening width is within 30 mm in the flow charts of the first to third embodiments, only when the limit switch 8 is within the window opening width of 30 mm. The controller 10 is energized.

It should be noted that an embodiment in which the vehicle speed signal is used to simplify the operating conditions, and the vehicle speed signal is used in combination to prevent a malfunction is conceivable, but a detailed description thereof will be omitted.

[0030]

As described above, according to the present invention, the noise level detecting section, the detecting section that the opening width of the window is equal to or less than a predetermined value, and the voltage applied to the power window motor are predetermined. Since it is a power window opening and closing device for automobiles having a control unit that changes based on the calculation of, while reducing the discomfort caused by a sudden increase in noise when opening a window while adapting to the loudness of wind noise during high-speed traveling, It is possible to prevent the user from feeling a pressure on the ears when closing the window, and to improve the comfort when opening and closing the window glass.

[Brief description of drawings]

FIG. 1 is a power window opening / closing device for an automobile of the present invention.

FIG. 2 is a cross-sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view of the main parts of FIG.

FIG. 4 is a schematic block diagram of the present invention.

FIG. 5 is a flowchart of control.

FIG. 6 is a graph showing the relationship between the voltage of the power window motor and the opening / closing speed.

FIG. 7 is a graph showing the sound pressure level in the room when the power window is opened and closed.

[Explanation of symbols]

 1 Door 1a Door outer panel 1b Door inner panel 2a Glass front channel part 2b Glass rear channel part 3 Motor 4 Drum part 5 Wire 6 Guide rail 7 Power and control signal cable bundle 8 Limit switch 8a Roller part 9 Microphone unit 10 Control unit 11 Door mirror 12 High pass filter 13 Slider 14 Glass 15 Weatherstrip rubber

Claims (2)

[Claims] 1. A vehicle having a power window for an automobile, the window of which is opened and closed by an electric motor, wherein a noise level detection unit, a detection unit that the opening width of the window is a predetermined value or less, and an electric motor of the power window. A power window opening / closing device for an automobile, comprising: a control unit that changes a voltage applied to the power window. 2. The power window opening / closing device for an automobile according to claim 1, wherein the noise level detecting section includes a microphone installed inside the door and a high-pass filter for selecting high-frequency components.