JPS63168567A - Vehicle speed measuring apparatus - Google Patents

Vehicle speed measuring apparatus

Info

Publication number
JPS63168567A
JPS63168567A JP31284286A JP31284286A JPS63168567A JP S63168567 A JPS63168567 A JP S63168567A JP 31284286 A JP31284286 A JP 31284286A JP 31284286 A JP31284286 A JP 31284286A JP S63168567 A JPS63168567 A JP S63168567A
Authority
JP
Japan
Prior art keywords
vehicle speed
frequency division
circuit
speed
range
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
Application number
JP31284286A
Other languages
Japanese (ja)
Inventor
Toru Kumasaka
徹 熊坂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP31284286A priority Critical patent/JPS63168567A/en
Publication of JPS63168567A publication Critical patent/JPS63168567A/en
Pending legal-status Critical Current

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  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

PURPOSE:To enable accurate measurement of vehicle speed, by switching the frequency division ratio of a frequency division circuit over to that for a corresponding vehicle speed range when an output of a vehicle speed computation circuit changes beyond a specified value. CONSTITUTION:A vehicle speed measuring apparatus 11 divides the frequency of a speed pulse with the frequency corresponding to a speed data (v) that is the output of a vehicle sensor 2 with a frequency division circuit 3 at a frequency division ratio different for low and high speed ranges. When an output of a vehicle speed computing circuit 12 to obtain a vehicle speed (v) based on an frequency division output of the circuit 3 changes beyond a preset fixed value, the frequency division ratio of the circuit 3 is changed over to that for a corresponding vehicle speed range. This eliminates variations in the delay time due to the switching of the speed range with the frequency division timing to allow the switching of the frequency division ratio solely based on changes in the vehicle speed and so, transitional state changes can be detected from the low to high vehicle speed range and vice versus, thereby getting rid of rooms for erroneous measurement.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、計測レンジ切り替え時の誤計測をなくすよ
うにした車速計測装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle speed measuring device that eliminates erroneous measurements when switching measurement ranges.

[従来の技術] 車両の走行速度を計測する車速計測装置には、車輪の回
転を検出する車速センサの出力速度パルスを計数回路に
て計数し、この計数回路の単位時間当たりの計数値をも
って車速を計測する構成のものがある。第3図に示す0
〜256Km/hrの計測レンジをもっ車速計測装置l
は、計測レンジを大略2分割し、時速100 K m 
/ h r以下の低速域と、時速1100K/hrを越
える高速域とで、車速センサ2の出力速度パルスに対す
る分周比を切り替えるようにしである。すなわち、車速
センサ2は、分周比が■と1/2の2通りに切り替えら
れる分周回路3を介して、計数回路4に接続されており
、高速域における計数回路4の計数値オーバフローを防
止するとともに、低速域での計測精度を高めるよう工夫
しである。本例の場合、分周回路3には、計数回路4か
らのレンジ切り替え指令によって切り替わる切り替えス
イッチ5と、この切り替えスイッチ5に選択的に接続さ
れる1/2分周器6と信号線路7が設けてあり、計測レ
ンジとして高速域が選択された場合、計数回路4の計数
出力から割り出される車速データを2倍して得られる車
速か、車速を利用した制御機構8に供給されるようにな
っていた。
[Prior Art] A vehicle speed measuring device that measures the running speed of a vehicle uses a counting circuit to count the output speed pulses of a vehicle speed sensor that detects the rotation of a wheel, and calculates the vehicle speed based on the count value of this counting circuit per unit time. There is a configuration that measures . 0 shown in Figure 3
Vehicle speed measurement device with a measurement range of ~256Km/hr
The measuring range is roughly divided into two, and the speed is 100 km/h.
The frequency division ratio for the output speed pulse of the vehicle speed sensor 2 is switched between a low speed range of /hr or less and a high speed range of more than 1100 K/hr. That is, the vehicle speed sensor 2 is connected to the counting circuit 4 via a frequency dividing circuit 3 whose frequency division ratio can be switched between two ways: ■ and 1/2. In addition to preventing this, the design is designed to improve measurement accuracy in the low speed range. In this example, the frequency divider circuit 3 includes a changeover switch 5 that is switched by a range switching command from the counting circuit 4, a 1/2 frequency divider 6 and a signal line 7 that are selectively connected to the changeover switch 5. If the high speed range is selected as the measurement range, the vehicle speed obtained by doubling the vehicle speed data calculated from the counting output of the counting circuit 4 or the vehicle speed is supplied to the control mechanism 8 that uses the vehicle speed. It had become.

[発明が解決しようとする問題点] に記従来の車速計測装置1は、計数回路4が分周波数回
路3内の切り替えスイッチ5を切り替えても、実際に行
われる分周比の切り替えは、速度パルスの波形の立し上
がり又は立ち下がりを捕らえてなされていたため、こう
した分周タイミングのずれが車速データにばらつきを与
えていた。すなわち、計測レンジを低速域から高速域に
切り替える場合は、問題なく滑らかに移行するが、計測
レンジを高速域から低速域に切り替える場合は、第4図
に示したように、切り替えスイッチ5の切り替えのタイ
ミングが時刻τ1である場合と、時刻で2〜τ4である
場合とで、分周回路3の出力に夏パルス分の差異が生じ
てしまう。このため、時刻τIに切り替えスイッチ5を
切り替えたときに、計数回路4側で行う2倍演算の取り
消し指令が、わずかでも遅れてしまうようなことがある
と、101.100,200.99Km/hrのごとく
、欠如として200Km/hrといったでたらめな車速
データが、制御機構8に供給されてしまい、車両走行に
重大な支障を来すことがある等の問題点があった。
[Problems to be Solved by the Invention] In the conventional vehicle speed measuring device 1 described in , even if the counting circuit 4 switches the changeover switch 5 in the frequency division circuit 3, the actual switching of the frequency division ratio is limited to the speed. Since this is done by capturing the rise or fall of the pulse waveform, this shift in frequency division timing causes variations in vehicle speed data. In other words, when switching the measurement range from the low speed range to the high speed range, the transition is smooth without any problems, but when switching the measurement range from the high speed range to the low speed range, as shown in FIG. There will be a difference in the output of the frequency dividing circuit 3 by the amount of the summer pulse between when the timing is time τ1 and when the timing is from 2 to τ4. For this reason, when the changeover switch 5 is switched at time τI, if the command to cancel the doubling operation performed on the counting circuit 4 side is even slightly delayed, the speed is 101.100, 200.99 km/hr. However, there was a problem in that the missing vehicle speed data, such as 200 km/hr, was supplied to the control mechanism 8, which could seriously impede the running of the vehicle.

[問題点を解決するための手段] この発明は、上記問題点を解決したものであり、車速セ
ンサの出力である車速に対応する周波数をもつ速度パル
スを、低速域と高速域とで異なる分周比にて分周する分
周回路と、この分周回路の分周出力にもとづいて車両の
速度データを算出する車速演算回路と、この車速演算回
路の出力速度データを監視し、あらかじめ定めた一定値
を越える変化が認められる場合に、前記分周回路の分周
比を対応する車速域のものに切り替える分周比切り替え
手段とから構成したことを特徴とするものである。
[Means for Solving the Problems] The present invention solves the above problems by dividing the speed pulse having a frequency corresponding to the vehicle speed, which is the output of the vehicle speed sensor, into different parts between the low speed range and the high speed range. A frequency dividing circuit that divides the frequency according to the frequency ratio, a vehicle speed calculation circuit that calculates vehicle speed data based on the divided output of this frequency division circuit, and a vehicle speed calculation circuit that monitors the output speed data of this vehicle speed calculation circuit and calculates a predetermined speed. The present invention is characterized by comprising frequency division ratio switching means for switching the frequency division ratio of the frequency dividing circuit to a frequency division ratio in a corresponding vehicle speed range when a change exceeding a certain value is recognized.

[作用] この発明は、車速センサの出力である車速に対応する周
波数をもつ速度パルスを、低速域と高速域とで異なる分
周比にて分周するとともに、この分周出力にもとづいて
速度データを得る車速演算回路の出力が、あらかじめ定
めた一定値を越えて変化したときに、分周回路の分周比
を対応する車速域のものに切り替える。
[Function] This invention divides a speed pulse having a frequency corresponding to the vehicle speed, which is the output of a vehicle speed sensor, at different division ratios in the low speed range and high speed range, and calculates the speed based on the divided output. When the output of the vehicle speed calculation circuit for obtaining data changes beyond a predetermined constant value, the frequency division ratio of the frequency divider circuit is switched to that in the corresponding vehicle speed range.

[実施例] 以下、この発明の実施例について、第1.2図を参照し
て説明する。第1図は、この発明の車速計測装置の一実
施例を示す回路構成図、第2図は、第1図に示した中央
処理装置の演算動作を説明するためのフローチャートで
ある。
[Example] Hereinafter, an example of the present invention will be described with reference to FIG. 1.2. FIG. 1 is a circuit diagram showing an embodiment of the vehicle speed measuring device of the present invention, and FIG. 2 is a flowchart for explaining the calculation operation of the central processing unit shown in FIG.

第1図中、車速計測装置11は、車速センサ2の出力で
ある車速に対応する周波数をもつ速度パルスを、低速域
と高速域とで異なる分周比にて分周する前述の分周回路
3と、この分周回路3の分周出力にもとづいて車両の速
度データを算出する車速演算回路I2と、この車速演算
回路12の出力速度データを監視し、あらかじめ定めた
一定値を越える変化が認められる場合に、分周回路3の
分周比を対応する車速域のらのに切り替える分周比切り
替え手段としての中央処理装置13及び計通IJc飴チ
ー市:=M ty fシーイいア市i1−箇、ト2千j
PずIt ly m制御する制御機構8から構成される
In FIG. 1, the vehicle speed measuring device 11 includes the aforementioned frequency dividing circuit that divides the speed pulse having a frequency corresponding to the vehicle speed, which is the output of the vehicle speed sensor 2, at different frequency division ratios in the low speed range and the high speed range. 3, a vehicle speed calculation circuit I2 that calculates vehicle speed data based on the frequency division output of this frequency division circuit 3, and a vehicle speed calculation circuit I2 that monitors the output speed data of this vehicle speed calculation circuit 12 and detects a change exceeding a predetermined constant value. If approved, the central processing unit 13 as a frequency division ratio switching means for switching the frequency division ratio of the frequency dividing circuit 3 to the corresponding vehicle speed range and the central processing unit 13 i1-item, t2,000j
It is composed of a control mechanism 8 that controls PzuItlym.

ここで、車両が低速で走行しており、計測レンジが低速
域にあったとする。この場合、最初のステップ(101
)にて、計測レンジ切り替え信号5LCTがハイレベル
であることが判ると、ステップ(102)において、高
速域から低速域への過渡状態を示すフラグFlがロウレ
ベルであるかどうかが判断される。そして、過渡的な状
態を既に脱してしまったことが判ると、ステップ(10
3)から(105)までの各ステップを経て、低速域に
おける車速計測が行われる。すなわち、ステップ(10
3)では、車速演算回路12から得られる速度データV
が、そのまま車両速度Vとして取り込まれ、この車両速
度Vが、計測レンジの高速域と低速域の境界である11
00K/hrの前後に設けたハンチング防止のためのヒ
ステリシス上限Vd(例えばI01Km/hr)に満た
ないことが判ると、前回の車両速度V′がVによって置
き換えられる。しかし、車両速度Vがヒステリシス上限
Vd以上であることが判った場合は、ステツブ(104
)に続くステップ(106)において、計測レンジとし
て高速域が選択され、続くステップ(107)において
低速域から高速域への過渡状態を示すフラグF2がハイ
レベルとされる。この場合、ステップ(105)と(+
01)を経て、後述するステップ(112)に移行する
ことになる。
Here, it is assumed that the vehicle is traveling at low speed and the measurement range is in the low speed range. In this case, the first step (101
), when it is determined that the measurement range switching signal 5LCT is at a high level, it is determined at step (102) whether a flag Fl indicating a transition state from a high speed range to a low speed range is at a low level. Then, when it is determined that the transitional state has already been overcome, step (10)
After each step from 3) to (105), vehicle speed measurement in the low speed range is performed. That is, step (10
3), the speed data V obtained from the vehicle speed calculation circuit 12
is taken as is as the vehicle speed V, and this vehicle speed V is the boundary between the high speed range and the low speed range of the measurement range.
If it is found that the hysteresis upper limit Vd (for example, I01 Km/hr) for preventing hunting provided before and after 00 Km/hr is not reached, the previous vehicle speed V' is replaced by V. However, if it is found that the vehicle speed V is greater than or equal to the hysteresis upper limit Vd, the step (104
), the high-speed range is selected as the measurement range, and in the following step (107), the flag F2 indicating a transitional state from the low-speed range to the high-speed range is set to high level. In this case, step (105) and (+
01), the process moves to step (112), which will be described later.

一方、ステップ(102)において、高速域から低速域
への過渡状態を示すフラグFlが71イレベルであるこ
とが判ると、次のステップ(108)において、速度デ
ータVが前回の車両速度■°の3/4以上にあたるかど
うかが判断される。この判断は、上記過渡状態を脱した
かどうかをみるためのものであり、分周回路3における
分周比が1に復帰したことで判断が肯定された場合は、
ステップ(109)において車両速度Vとして速度デー
タVをそのまま採用するとともに、さらに続くステップ
(+10)にて過渡状態の終了を示すためフラグF1を
ロウレベルに切り替える。しかし、判断が否定された場
合は、まだ分周回路3において分周比の切り替えが済ん
でおらず、実質的に計測レンジは高速域として取り扱う
必要があるため、ステップ(111)にて速度データV
の2倍に相当する2vが車両速度Vとして採用される。
On the other hand, in step (102), if it is found that the flag Fl indicating a transition state from a high speed range to a low speed range is at the 71 level, in the next step (108), the speed data V is changed from the previous vehicle speed ■°. It is determined whether or not it corresponds to 3/4 or more. This judgment is to see whether the above-mentioned transient state has been overcome, and if the judgment is affirmed because the frequency division ratio in the frequency dividing circuit 3 has returned to 1, then
In step (109), the speed data V is directly adopted as the vehicle speed V, and in the following step (+10), the flag F1 is switched to low level to indicate the end of the transient state. However, if the judgment is negative, the frequency dividing ratio has not yet been switched in the frequency dividing circuit 3 and the measurement range must be treated as a high speed range, so the speed data is processed in step (111). V
2v, which is twice the value of V, is adopted as the vehicle speed V.

この場合、ステップ(110)もステップ(+ 11)
も、ともにステップ(+05)に続く。
In this case, step (110) is also step (+11)
Both follow step (+05).

これに対し、ステップ(+01)にて車速計測レンジが
高速域にあることが判ると、まずステップ(112)に
て低速域から高速域への過渡状態であるか否かの判断が
行われる。そして、この過渡状態を既に脱してしまった
ことが判ると、ステップ(113)、([14)、(1
05)までの各ステップを経て、高速域における車速計
測が行われる。すなわち、車速演算回路12から得られ
るifデータVが、そのまま車両速度Vとして取り込ま
れ、この車両速度Vが前記ヒステリシスの下限Vm(例
えば99Km/hr)を越えることが判ると、前回の車
両速度V゛がVによって置き換えられる。しかし、車両
速度Vがヒステリシス下限Vmに満たないことが判った
場合は、ステップ(114)に続くステップ(115)
において、計測レンジとして低速域が選択され、さらに
ステップ(116)において高速域から低速域への過渡
状態を示すフラグFlがハイレベルとされる。この場合
、ステップ(105)と(lot)を経て、前述のステ
ップ(102)に移行することになる。
On the other hand, if it is determined in step (+01) that the vehicle speed measurement range is in the high speed range, first, in step (112), it is determined whether or not there is a transition state from the low speed range to the high speed range. Then, when it is found that this transient state has already escaped, steps (113), ([14), (1
After each step up to step 05), vehicle speed measurement in a high speed range is performed. That is, the if data V obtained from the vehicle speed calculation circuit 12 is taken in as it is as the vehicle speed V, and when it is found that this vehicle speed V exceeds the lower limit Vm of the hysteresis (for example, 99 Km/hr), the previous vehicle speed V゛ is replaced by V. However, if it is found that the vehicle speed V is less than the hysteresis lower limit Vm, step (115) following step (114) is performed.
In step (116), a low speed range is selected as the measurement range, and a flag Fl indicating a transition state from a high speed range to a low speed range is set to a high level. In this case, the process goes through steps (105) and (lot) and then moves to the above-mentioned step (102).

一方、ステップ(112)において低速域から高速域へ
の過渡状態を示すフラグF2が/%イレベルであること
が判った場合、ステップ(117)において、速度デー
タVが前回の車両速度■°の3/4に満たないかどうか
判断される。この判断は、上記過渡状態が終了したかど
うかをみるためのものであり、分周回路3の分周比が1
/2に切り替わったことで判断が肯定された場合は、ス
テップ(11B)において車両速度■として速度データ
2vを採用し、さらに続くステップ(119)にて過渡
状態の終了を示すべくフラグF2をロウレベルに切り替
えたのち、ステップ(+05)に移行する。しかし、判
断が否定された場合は、ますF l−S r−[J r
n+改Q 1.−おいて4)周圧のυ1り林えが済んで
おらず、実質的に計測レンジは低速域として取り扱う必
要があるため、ステップ(105)にて速度データVを
車両速度Vに取り込む。
On the other hand, if it is found in step (112) that the flag F2 indicating a transition state from a low speed range to a high speed range is at the /% level, then in step (117) the speed data V is 3% of the previous vehicle speed ■°. It will be determined whether it is less than /4. This judgment is to check whether the above-mentioned transient state has ended, and the frequency division ratio of the frequency divider circuit 3 is 1.
/2, if the judgment is affirmative, the speed data 2v is adopted as the vehicle speed ■ in step (11B), and the flag F2 is set to low level in the following step (119) to indicate the end of the transient state. After switching to step (+05). However, if the judgment is denied, then F l−S r−[J r
n+revised Q 1. 4) Since the circumferential pressure υ1 has not yet been measured and the measurement range must be treated as a low speed range, the speed data V is incorporated into the vehicle speed V in step (105).

このように、上記車速計測装置!■は、車速センサ2の
出力である速度データVに対応する周波数をもつ速度パ
ルスを、分周回路3にて低速域と高速域とで異なる分周
比にて分周するとともに、分周回路3の分周出力にもと
づいて車両速度Vを得る車速演算回路■2の出力が、あ
らかじめ定めた一定値を越えて変化したときに、分周回
路3の分周比を対応する車速域のものに切り替える構成
としたから、速度パルスの波形の立ち上がり又は立ち下
がりを捕らえて分周回路3の分周比を切り替えていた従
来の装置と異なり、分周タイミングによってレンジ切り
替えの遅れ時間がばらついたりすることはなく、あくま
で車速の変化を基準に分周比を切り替えるため、低速域
から高速域又はその逆の過渡的な状態変化を、素早く察
知することができ、これにより誤計測の余地を産むこと
なく、正確な車速計測が可能である。
In this way, the above vehicle speed measurement device! (2) divides the speed pulse having a frequency corresponding to the speed data V, which is the output of the vehicle speed sensor 2, in the frequency dividing circuit 3 at different frequency division ratios for the low speed range and the high speed range, and Vehicle speed calculation circuit that obtains vehicle speed V based on the frequency division output of frequency division circuit 3 ■When the output of frequency division circuit 3 changes beyond a predetermined constant value, the frequency division ratio of frequency division circuit 3 is changed to that of the corresponding vehicle speed range. Unlike conventional devices that switch the frequency division ratio of the frequency divider circuit 3 by capturing the rise or fall of the speed pulse waveform, the range switching delay time varies depending on the frequency division timing. Since the frequency dividing ratio is changed based on changes in vehicle speed, transient state changes from low speed range to high speed range or vice versa can be quickly detected, which creates room for erroneous measurements. Therefore, accurate vehicle speed measurement is possible.

[発明の効果] 以上説明したように、この発明は、車速センサの出力で
ある車速に対応する周波数をもつ速度パルスを、低速域
と高速域とで異なる分周比にて分周するとともに、この
分周出力にもとづいて速度データを得る車速演算回路の
出力が、あらかじめ定めた一定値を越えて変化したとき
に、分周回路の分周比を対応する車速域のものに切り替
える構成としたから、速度パルスの波形の立ち上がり又
は立ち下がりを捕らえて分周回路の分周比を切り替えて
いた従来の装置と異なり、分周タイミングによってレン
ジ切り替えの遅れ時間がばらついたりすることはなく、
あくまで車速の変化を基準に分周比を切り替えるため、
低速域から高速域又はその逆の過渡的な状態変化を、素
早く察知することができ、これにより誤計測の余地を産
むことなく、正確な車速計測が可能である等の優れた効
果を奏する。
[Effects of the Invention] As explained above, the present invention divides the speed pulse having a frequency corresponding to the vehicle speed, which is the output of the vehicle speed sensor, at different division ratios in the low speed range and the high speed range, and When the output of the vehicle speed calculation circuit that obtains speed data based on this frequency division output changes beyond a predetermined constant value, the frequency division ratio of the frequency division circuit is switched to the one in the corresponding vehicle speed range. Therefore, unlike conventional devices that switch the frequency division ratio of the frequency divider circuit by capturing the rise or fall of the speed pulse waveform, the range switching delay time does not vary depending on the frequency division timing.
In order to switch the frequency division ratio based on changes in vehicle speed,
A transient state change from a low speed range to a high speed range or vice versa can be quickly detected, and this provides excellent effects such as accurate vehicle speed measurement without creating any room for erroneous measurements.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、この発明の車速計測装置の一実施例を示す回
路構成図、第2図は、第1図に示した中央処理装置の演
算動作を説明するためのフローチャート、第3図は、従
来の車速計測装置の一例を示す回路構成図、第4図は、
第3図に示した分周回路の分周動作を説明するための信
号波形図である。 210.車速センサ、3.、、分周回路、11゜9.車
速計測装置、12.、、車速演算回路。 13、、、中央処理装置。
FIG. 1 is a circuit configuration diagram showing an embodiment of the vehicle speed measuring device of the present invention, FIG. 2 is a flowchart for explaining the calculation operation of the central processing unit shown in FIG. 1, and FIG. FIG. 4 is a circuit diagram showing an example of a conventional vehicle speed measuring device.
FIG. 4 is a signal waveform diagram for explaining the frequency dividing operation of the frequency dividing circuit shown in FIG. 3; 210. Vehicle speed sensor, 3. , , frequency divider circuit, 11°9. Vehicle speed measuring device, 12. ,,vehicle speed calculation circuit. 13. Central processing unit.

Claims (1)

【特許請求の範囲】[Claims] 車速センサの出力である車速に対応する周波数をもつ速
度パルスを、低速域と高速域とで異なる分周比にて分周
する分周回路と、この分周回路の分周出力にもとづいて
車両の速度データを算出する車速演算回路と、この車速
演算回路の出力速度データを監視し、あらかじめ定めた
一定値を越える変化が認められる場合に、前記分周回路
の分周比を対応する車速域のものに切り替える分周比切
り替え手段とからなる車速計測装置。
A frequency dividing circuit divides the speed pulse having a frequency corresponding to the vehicle speed, which is the output of the vehicle speed sensor, at different division ratios in the low speed range and high speed range, and the vehicle A vehicle speed calculation circuit that calculates the speed data of the vehicle speed calculation circuit, and a vehicle speed calculation circuit that monitors the output speed data of this vehicle speed calculation circuit, and when a change exceeding a predetermined value is observed, changes the frequency division ratio of the frequency division circuit to the corresponding vehicle speed range. A vehicle speed measuring device comprising a dividing ratio switching means for switching between frequency division ratios.
JP31284286A 1986-12-30 1986-12-30 Vehicle speed measuring apparatus Pending JPS63168567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31284286A JPS63168567A (en) 1986-12-30 1986-12-30 Vehicle speed measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31284286A JPS63168567A (en) 1986-12-30 1986-12-30 Vehicle speed measuring apparatus

Publications (1)

Publication Number Publication Date
JPS63168567A true JPS63168567A (en) 1988-07-12

Family

ID=18034083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31284286A Pending JPS63168567A (en) 1986-12-30 1986-12-30 Vehicle speed measuring apparatus

Country Status (1)

Country Link
JP (1) JPS63168567A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04310874A (en) * 1991-04-09 1992-11-02 Fujitsu Ltd Pulse width counter circuit
WO2013054690A1 (en) * 2011-10-11 2013-04-18 Ntn株式会社 Laser tracker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5160574A (en) * 1974-11-25 1976-05-26 Mitsubishi Heavy Ind Ltd Sokotaino sokudosokuteisochi
JPS59210373A (en) * 1983-05-16 1984-11-29 Nissan Motor Co Ltd Wheel speed arithmetic device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5160574A (en) * 1974-11-25 1976-05-26 Mitsubishi Heavy Ind Ltd Sokotaino sokudosokuteisochi
JPS59210373A (en) * 1983-05-16 1984-11-29 Nissan Motor Co Ltd Wheel speed arithmetic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04310874A (en) * 1991-04-09 1992-11-02 Fujitsu Ltd Pulse width counter circuit
WO2013054690A1 (en) * 2011-10-11 2013-04-18 Ntn株式会社 Laser tracker

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