JPS61169374A - Car room noise prevention device - Google Patents

Abstract

PURPOSE:To minimize the period of continuity between the inside and outside of a car room as much as possible by giving continuity between the inside and the outside of the car only when a throb sound is increased while the car is running with a sunroof opened. CONSTITUTION:A roof plate 2 that covers an opening 1a for a sunroof so as to freely open and close is mounted on a car body roof 1. On the other hand, microphones 4a and 4b for detecting a throb sound are mounted on the upper right and left of a rear seat 3. In addition, a duct 10 that connects an outer wall opening 10a formed on a car body side wall 6 to an intra-room opening 10b formed in a rear tray 7 is provided at the rear of the rear seat 3. Besides, when the state of the throb sound generation is detected, the continuity between the inside and outside of the car room is achieved by the duct 10 and the throb sound is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for preventing slobbing noise generated in the vehicle interior during driving with the sunroof open in a vehicle having a sunroof that can be freely opened and closed on the roof of the vehicle body. It is something.

(Prior Art) Conventionally, automobiles have been used in which a sunroof that can be freely opened and closed is provided on the roof of the vehicle body, and the sunroof can be opened while driving to introduce sunlight, outside air, etc. into the vehicle interior. On the other hand, it is known that when driving with the windows open, the cabin of the vehicle acts like a resonance box, causing a relatively low-frequency (around 20Hz) air vibration phenomenon called wind throb. This phenomenon occurs even when the car window is closed and the sunroof is open in a car equipped with a sunroof, and there is a problem in that the slobbing noise generated at this time causes discomfort to the occupants.

To solve this problem, we considered that if a slob noise occurs while driving with the sunroof open, the slob noise can be prevented by opening the car window to a certain extent.
As disclosed in Japanese Patent No. 158,513, a slob noise prevention device has been proposed in which a vehicle window is also opened in response to opening of a sunroof.

However, slob noise occurs only in a certain vehicle speed range where the single room acts as a resonance box, and when the car window is opened, wind is drawn in by the pillars and wind enters the passenger compartment, and external noise is transferred to the passenger compartment. Considering the impact on passengers due to the direct transmission of noise to passengers, it is desirable to keep the window open time to the minimum necessary to prevent the generation of slob noise, unless the passenger opens the window voluntarily.

(Purpose of the Invention) In view of the above circumstances, the present invention has been devised to reduce the slob noise by partially communicating between the interior and exterior of the vehicle only when the slob noise becomes loud while driving with the sunroof open. The object of the present invention is to provide a noise prevention device that can minimize the communication time between the interior and exterior of a vehicle to prevent the generation of slob noise.

(Structure of the Invention) The vehicle interior noise prevention device of the present invention is provided with a communication means for communicating the interior of the vehicle with the outside of the vehicle in an automobile equipped with a sunroof, and the communication of the communication means can be opened and closed by an opening/closing member. The present invention is characterized in that, when the detection means detects a state in which a slob noise is generated in the vehicle interior during driving, the detection means issues a drive signal to the drive means for opening the opening/closing member, so that the opening/closing member is opened. .

Note that the communication means may be a duct that communicates the interior and exterior of the vehicle. In addition, the slob sound generation state refers to a state in which the slob sound has become louder than a predetermined value, and the means for detecting this may be directly detected by a microphone, and the magnitude of the slob sound can be determined by the vehicle speed (V). These (V
, h).

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an automobile equipped with a noise prevention device according to the present invention, with side doors removed. A sunroof opening 1a is formed in a vehicle body roof 1, and a roof plate 2 which is slidable back and forth and covers this frontage 1a in an openable and closable manner is attached to the vehicle body roof 1 to form a sunroof. On the other hand, microphones 4a and 4b for detecting slob sounds are attached to the upper left and right sides of the rear seat 3.

Note that the slop sound is a low frequency sound with a frequency of 20H2, so when detecting the slob sound using the microphones 4a and 4b, for example, a low-pass filter that only passes sounds of 70 Hz or lower is installed, and a low-pass filter is installed to pass only sounds of 70 Hz or less, so that the sound of the radio, stereo, or speech inside the vehicle can be removed. It is desirable to avoid such effects. Rear seat 3
A duct 10 is provided at the rear of the vehicle to communicate an outer wall opening 10a formed in the side wall 6 of the vehicle body and open to the outside of the vehicle, and an interior opening 10b formed in the rear tray 7 and opened to the interior of the vehicle. It serves as a means of communication between the outside of the vehicle and the interior of the vehicle. Note that the ducts 10 may be provided in pairs symmetrically on the left and right sides of the vehicle body. On the rear V-tray 7 of the rear seat 3, a microphone 4a,
A control device 5 including, for example, a microcomputer is attached to control the opening/closing operation of the opening/closing means installed in the duct 10 based on the throb sound detected by the duct 4b.

FIG. 2 shows an enlarged view of the vicinity of the indoor opening 10b of the duct 10, and also shows the opening/closing means installed inside the duct 10. This opening/closing means has a fulcrum 1 in the duct 10.
Consisting of a plate-shaped butterfly valve 11 rotatably arranged around 18.11b, this butterfly valve 11
and the duct 10.
, 12b bias the butterfly valve 11 in the direction of closing the passage within the duct 10. On the other hand, a torque arm 13 extending downward is fixed to the side end of the opening/closing plate 11, and the end of a wire 14 wound around a pulley 15 is tightly attached to the lower end of the torque arm 13. The pulley 15 is fixed on the shaft of the drive motor 16, and the drive motor 16 is driven by the control device 5, and the pulley 15 moves the wire 14.
By winding up the butterfly valve 11, the butterfly valve 11 is rotated (rotation in the direction of the arrow) via the torque arm 13 against the urging force of the coil springs 12a, 12t).
1 can be opened. When the drive motor 16 is rotated in the opposite direction to the above from the state where the butterfly valve 11 is open, the butterfly valve 11 is rotated by the coil spring 1.
It is closed by the biasing forces of 2a and 12b.

Hereinafter, one example of controlling the opening/closing operation of the butterfly valve 11 explained in E will be explained with reference to the flowchart of FIG. 3. This flow starts from step S1, and in step S2 it is determined whether or not the sunroof is open. If it is open, the flow advances to steps 83 and 84 to detect the slob sound (X) and detect this value (X ) is greater than a predetermined threshold (a), for example 60 dB. When the slob sound (X) is larger than the threshold value (a), the butterfly valve is opened in step S5, and when it is smaller, the butterfly valve is closed in step S6. Note that when it is determined in step S2 that the sunroof is closed, no slob noise is generated, so the process proceeds to step S6 and the butterfly valve is closed.

FIG. 4 is a graph showing the relationship between the measured sound pressure of the slob noise inside the vehicle and the vehicle speed when the vehicle is driven with the sunroof open. As can be seen from this graph, the sound pressure of the slob sound can be grasped as a function of vehicle speed. For example, in this example, the slop sound exceeds 60 dB when the vehicle speed is 551/H ~ 80 dB.
In the range of b/H. Slob sound is caused by a resonance phenomenon in which the vehicle interior serves as a resonance box, and the relationship between vehicle speed and slob sound pressure is constant as long as the vehicle interior shape is the same. ) can also be understood as a function of Therefore, the vehicle speed (V) and the sunroof opening amount (
By detecting h), the generation state of the slob sound can be detected without directly detecting the slob sound.

An example of controlling the rM closing of the butterfly valve based on the detection of the vehicle speed (V) and the sunroof opening 1 (h) will be explained with reference to the flowchart of FIG. This flow starts from step S7, and in step S8 it is determined whether the sunroof is open, and if it is opened, steps S9 to 811
After detecting the vehicle speed (V) and sunroof opening (h) according to /H) or more, and the upper limit value c(
h) Determine whether it is less than (80KIR/H in FIG. 4). When the vehicle speed (V) is equal to or higher than the lower limit b (h), the upper limit c
(h) When the slob noise is above a predetermined value, the process proceeds to step 812 and opens the butterfly valve; at other vehicle speeds, the process proceeds to step 813 and closes the butterfly valve. In addition,
When it is determined in step S8 that the sunroof is closed, the process proceeds to step 813 and the butterfly valve is closed.

In the above example, when the slob noise generation state is detected, the slob noise is reduced by establishing communication between the inside and outside of the vehicle through a duct, but it is also possible to open and close the car window instead of establishing communication through the duct. Of course it's good. However, when a duct is used, there are advantages in that there is less wind intrusion into the vehicle interior and less intrusion of outside noise.

(Effects of the Invention) As explained above, in the present invention, only when the detection means detects the occurrence of the slob noise, the communication means connects the inside and outside of the vehicle to reduce the slob noise. , Communication by the communication means can be kept to the minimum necessary, and opportunities for wind and noise to enter, which are likely to occur during communication, can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an automobile having a noise prevention device according to the present invention, FIG. 2 is an enlarged perspective view of a part of the noise prevention device, and FIGS. 3 and 5 are noise reduction devices according to the present invention. Flowchart for controlling the operation of the prevention device. FIG. 4 is a graph showing the relationship between vehicle speed and slob sound pressure. 2... Roof plate 3... Rear seat 4a, 4
b...Microphone 5...Control unit @ 10...Duct 11...
Butterfly valve 16... Drive motor Fig. 2 4 ((II prefecture exclusive)

Claims (1)

[Claims] 1) In an automobile equipped with a sunroof, a communication means for communicating between the interior of the vehicle and the outside of the vehicle, an opening/closing member for opening and closing the communication means, and detection of a slob noise generation state in the interior of the vehicle during driving. What is claimed is: 1. A vehicle interior noise prevention device comprising: a detection means for generating a drive signal; and a drive means for opening the opening/closing member only when receiving the drive signal. 2) The detection means includes a microphone disposed in the vehicle interior and a comparison means that compares a detected value of the slob sound from the microphone with a set value and issues a drive signal when the detected value exceeds the set value. A vehicle interior noise prevention device according to claim 1, characterized in that: 3) The vehicle interior noise prevention device according to claim 1, wherein the communication means comprises a duct that communicates between the vehicle interior and the exterior of the vehicle, and the opening/closing member is provided within the duct. .