JPS55138669A - Inter-vehicle distance measuring apparatus - Google Patents

Inter-vehicle distance measuring apparatus

Info

Publication number
JPS55138669A
JPS55138669A JP4701579A JP4701579A JPS55138669A JP S55138669 A JPS55138669 A JP S55138669A JP 4701579 A JP4701579 A JP 4701579A JP 4701579 A JP4701579 A JP 4701579A JP S55138669 A JPS55138669 A JP S55138669A
Authority
JP
Japan
Prior art keywords
inter
vehicle distance
ultrasonic waves
temperature
circuit
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
Application number
JP4701579A
Other languages
Japanese (ja)
Other versions
JPS633268B2 (en
Inventor
Takashi Iijima
Kenji Cho
Takao Kadowaki
Masuo Kawana
Kazuo Mikami
Teruhiko Tsuzuki
Masakatsu Matsuzaki
Kiyotaka Fukushima
Ryohei Kawasaki
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.)
KENSETSUSHO DOBOKU KENKYU
KENSETSUSHO DOBOKU KENKYU SHOCHO
Omron Corp
Original Assignee
KENSETSUSHO DOBOKU KENKYU
KENSETSUSHO DOBOKU KENKYU SHOCHO
Omron Tateisi Electronics Co
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 KENSETSUSHO DOBOKU KENKYU, KENSETSUSHO DOBOKU KENKYU SHOCHO, Omron Tateisi Electronics Co filed Critical KENSETSUSHO DOBOKU KENKYU
Priority to JP4701579A priority Critical patent/JPS55138669A/en
Publication of JPS55138669A publication Critical patent/JPS55138669A/en
Publication of JPS633268B2 publication Critical patent/JPS633268B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52004—Means for monitoring or calibrating
    • G01S7/52006—Means for monitoring or calibrating with provision for compensating the effects of temperature

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To correct the fluctuations in propagation speeds of ultrasonic waves based on the change in ambient temperature by changing the frequencies of a pulse generator according to ambient temperatures. CONSTITUTION:An inter-vehicle distance operating unit 8 clocks the period of the ultrasonic waves transmitted from a transmitter 2, converts these to an inter-vehicle distance and displays the same in a data display circuit 60. the propagation speed of the ultrasonic waves changes with temperature. In order to correct this, the output of a temperature setting circuit 52 is applied to a PLL circuit 53 which in turn corrects the output of an oscillator 51 and generates the clock pulses for distance operation at the frequency corresponding to the temperature. In addition, when the arithmetic circuit 8 fails to receive the receiving pulses despite the lapse of the specified time after the transmission of ultrasonic waves from the transmitter 2, it processes the inter-vehicle distance data of that time as a missing.
JP4701579A 1979-04-16 1979-04-16 Inter-vehicle distance measuring apparatus Granted JPS55138669A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4701579A JPS55138669A (en) 1979-04-16 1979-04-16 Inter-vehicle distance measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4701579A JPS55138669A (en) 1979-04-16 1979-04-16 Inter-vehicle distance measuring apparatus

Publications (2)

Publication Number Publication Date
JPS55138669A true JPS55138669A (en) 1980-10-29
JPS633268B2 JPS633268B2 (en) 1988-01-22

Family

ID=12763337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4701579A Granted JPS55138669A (en) 1979-04-16 1979-04-16 Inter-vehicle distance measuring apparatus

Country Status (1)

Country Link
JP (1) JPS55138669A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61218974A (en) * 1985-03-25 1986-09-29 Matsushita Electric Works Ltd Ultrasonic type tracking device
JPS6295479A (en) * 1985-10-22 1987-05-01 Fuji Electric Co Ltd Sound speed compensating method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4938257U (en) * 1972-07-04 1974-04-04
JPS5248504A (en) * 1972-09-21 1977-04-18 Nippon Carbon Co Ltd Material for preventing slip of running wheel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4938257U (en) * 1972-07-04 1974-04-04
JPS5248504A (en) * 1972-09-21 1977-04-18 Nippon Carbon Co Ltd Material for preventing slip of running wheel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61218974A (en) * 1985-03-25 1986-09-29 Matsushita Electric Works Ltd Ultrasonic type tracking device
JPS6295479A (en) * 1985-10-22 1987-05-01 Fuji Electric Co Ltd Sound speed compensating method

Also Published As

Publication number Publication date
JPS633268B2 (en) 1988-01-22

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees
EXPY Cancellation because of completion of term