JPH0235087U - - Google Patents
Info
- Publication number
- JPH0235087U JPH0235087U JP11431488U JP11431488U JPH0235087U JP H0235087 U JPH0235087 U JP H0235087U JP 11431488 U JP11431488 U JP 11431488U JP 11431488 U JP11431488 U JP 11431488U JP H0235087 U JPH0235087 U JP H0235087U
- Authority
- JP
- Japan
- Prior art keywords
- microphone
- receiving
- reception
- circuit
- vehicle speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims 1
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
第１図は発信器と受信器の配設位置を示す側面
図、第２図は本考案の一実施例の構成を示すブロ
ツク図、第３図は本考案の別の実施例の構成を示
すブロツク図、第４図は第２図に示す実施例にお
ける工程を説明するための線図、第５図は第３図
に示す実施例における工程を説明するための線図
、第６図は第３図に示す実施例における受信マイ
クロホンの特性を示す線図、第７図は車速と受信
強度との関係を示す線図、第８図は増幅回路の特
性を示す線図である。
２……発信器、３ａ，３ｂ，３ｃ……受信マイ
クロホン、４……マイクロホン切換回路、６……
反射波周波数算出回路、７……車速センサ、９，
９０，９１，９２……比較回路、１０……マイク
ロホン特性記憶回路。
Fig. 1 is a side view showing the arrangement positions of the transmitter and receiver, Fig. 2 is a block diagram showing the configuration of one embodiment of the invention, and Fig. 3 shows the structure of another embodiment of the invention. 4 is a diagram for explaining the steps in the embodiment shown in FIG. 2, FIG. 5 is a diagram for explaining the steps in the embodiment shown in FIG. 3, and FIG. 6 is a diagram for explaining the steps in the embodiment shown in FIG. FIG. 3 is a diagram showing the characteristics of the receiving microphone in the embodiment shown in FIG. 7, FIG. 7 is a diagram showing the relationship between vehicle speed and reception strength, and FIG. 8 is a diagram showing the characteristics of the amplifier circuit. 2... Transmitter, 3a, 3b, 3c... Receiving microphone, 4... Microphone switching circuit, 6...
Reflected wave frequency calculation circuit, 7...Vehicle speed sensor, 9,
90, 91, 92...comparison circuit, 10...microphone characteristic storage circuit.
Claims (1)
器と、 それぞれ異なる受信周波数特性を有する複数の
受信マイクロホンと、 複数の受信マイクロホンのそれぞれの受信特性
を記憶させたマイクロホン特性記憶回路と、 車速データを出力する車速センサと、 発信された超音波が所定距離の路面から反射し
て上記受信マイクロホンに到達するときの反射周
波数を、上記車速データに基づいて算出する反射
波周波数算出回路と、 算出された反射波周波数に対応する受信マイク
ロホンを選択し上記受信マイクロホンの一つを受
信状態に切り換えるマイクロホン切換回路と、 反射波を受信した受信マイクロホンの受信強度
と上記マイクロホン特性記憶回路が記憶している
マイクロホン特性とを比較して、特定の受信マイ
クロホンの受信した反射波信号を取り出す比較回
路 とを備えたことを特徴とする路面状況検出装置
。[Scope of Claim for Utility Model Registration] A transmitter that emits ultrasonic waves toward a road surface at a predetermined distance, a plurality of receiving microphones each having different receiving frequency characteristics, and the receiving characteristics of each of the plurality of receiving microphones being memorized. a microphone characteristic memory circuit; a vehicle speed sensor that outputs vehicle speed data; and a reflection sensor that calculates a reflection frequency when the transmitted ultrasonic wave is reflected from a road surface at a predetermined distance and reaches the receiving microphone based on the vehicle speed data. a wave frequency calculation circuit; a microphone switching circuit that selects a reception microphone corresponding to the calculated reflected wave frequency and switches one of the reception microphones to a reception state; and a reception intensity of the reception microphone that received the reflected wave and the microphone characteristics. A road surface condition detection device comprising: a comparison circuit that extracts a reflected wave signal received by a specific receiving microphone by comparing it with the microphone characteristics stored in the storage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11431488U JPH0714940Y2 (en) | 1988-08-31 | 1988-08-31 | Road condition detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11431488U JPH0714940Y2 (en) | 1988-08-31 | 1988-08-31 | Road condition detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0235087U true JPH0235087U (en) | 1990-03-06 |
| JPH0714940Y2 JPH0714940Y2 (en) | 1995-04-10 |
Family
ID=31354945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11431488U Expired - Lifetime JPH0714940Y2 (en) | 1988-08-31 | 1988-08-31 | Road condition detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0714940Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101716270B1 (en) * | 2015-12-03 | 2017-03-14 | 한국과학기술원 | The front ground state estimation apparatus and method |
-
1988
- 1988-08-31 JP JP11431488U patent/JPH0714940Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0714940Y2 (en) | 1995-04-10 |
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