JPH0272979U - - Google Patents
Info
- Publication number
- JPH0272979U JPH0272979U JP15297288U JP15297288U JPH0272979U JP H0272979 U JPH0272979 U JP H0272979U JP 15297288 U JP15297288 U JP 15297288U JP 15297288 U JP15297288 U JP 15297288U JP H0272979 U JPH0272979 U JP H0272979U
- Authority
- JP
- Japan
- Prior art keywords
- vehicle speed
- pulse
- trigger
- speed detection
- reed switch
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 235000014676 Phragmites communis Nutrition 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 4
- 244000145845 chattering Species 0.000 description 3
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measurement Of Distances Traversed On The Ground (AREA)
Description
第１図は本考案による車速検出装置の一例を概
略的に示すブロツク構成図、第２図は車速検出リ
ードスイツチのチヤタリング発生時のパルス信号
からチヤタリングを除去する方法を説明するため
の説明図、第３図は本考案による車速検出装置の
車速算出プログラムの一例を示すフローチヤート
、第４図は車速検出リードスイツチのパルス信号
の説明図、第５図は車速検出リードスイツチのチ
ヤタリング発生時のパルス信号の説明図である。
１……車速算出装置、２……車速検出リードス
イツチ、３……入力ポート、４……マイクロプロ
セツサユニツト、５……記憶装置、６……クロツ
ク回路、７……出力ポート、８……表示装置、９
……制御装置。
FIG. 1 is a block configuration diagram schematically showing an example of a vehicle speed detection device according to the present invention, and FIG. 2 is an explanatory diagram for explaining a method for removing chattering from a pulse signal when chattering occurs in a vehicle speed detection reed switch. Fig. 3 is a flowchart showing an example of a vehicle speed calculation program of the vehicle speed detection device according to the present invention, Fig. 4 is an explanatory diagram of a pulse signal of the vehicle speed detection reed switch, and Fig. 5 is a pulse when chattering occurs in the vehicle speed detection reed switch. It is an explanatory diagram of a signal. DESCRIPTION OF SYMBOLS 1...Vehicle speed calculation device, 2...Vehicle speed detection reed switch, 3...Input port, 4...Microprocessor unit, 5...Storage device, 6...Clock circuit, 7...Output port, 8... Display device, 9
……Control device.
Claims (1)
検出リードスイツチと、該車速検出リードスイツ
チからのパルス信号に基づいて車速を算出し算出
された車速に応じた信号を出力する車速算出装置
とを備えた車速検出装置において、 上記車速算出装置は、上記車速検出リードスイ
ツチからのパルス信号の１パルス毎の立上り時若
しくは立ち下がり時をトリガーとして該トリガー
から次のトリガーまでの時間を計測して上記パル
ス信号の１パルス毎の周期を順次検出し、その検
出された１パルス毎のパルス周期から順次車速を
算出するように構成されると共に、上記トリガー
から次のトリガーまでの時間を計測する際に、そ
の直前に検出されたパルス周期に基づいて算出さ
れた不感時間を設け、該不感時間中のトリガーを
検出しないように構成されたことを特徴とする車
速検出装置。[Scope of claim for utility model registration] A vehicle speed detection reed switch that generates a pulse signal according to the vehicle speed, and a vehicle speed that is calculated based on the pulse signal from the vehicle speed detection reed switch and a signal that is generated according to the calculated vehicle speed. In the vehicle speed detection device equipped with a vehicle speed calculation device that outputs an output, the vehicle speed calculation device uses the rise or fall of each pulse of the pulse signal from the vehicle speed detection reed switch as a trigger, and operates from the trigger to the next trigger. It is configured to measure the time of , sequentially detect the period of each pulse of the pulse signal, and calculate the vehicle speed sequentially from the detected pulse period of each pulse, and from the trigger to the next trigger. 1. A vehicle speed detection device characterized in that, when measuring the time, a dead time is provided which is calculated based on a pulse period detected immediately before the dead time, and the trigger is not detected during the dead time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15297288U JPH0272979U (en) | 1988-11-24 | 1988-11-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15297288U JPH0272979U (en) | 1988-11-24 | 1988-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0272979U true JPH0272979U (en) | 1990-06-04 |
Family
ID=31428388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15297288U Pending JPH0272979U (en) | 1988-11-24 | 1988-11-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0272979U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007093324A (en) * | 2005-09-28 | 2007-04-12 | Alpine Electronics Inc | Vehicle speed detection device and navigation device |
| JP2012132722A (en) * | 2010-12-20 | 2012-07-12 | Stanley Electric Co Ltd | Signal processing method for rotary encoder |
-
1988
- 1988-11-24 JP JP15297288U patent/JPH0272979U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007093324A (en) * | 2005-09-28 | 2007-04-12 | Alpine Electronics Inc | Vehicle speed detection device and navigation device |
| JP2012132722A (en) * | 2010-12-20 | 2012-07-12 | Stanley Electric Co Ltd | Signal processing method for rotary encoder |
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