JPS54108599A - Detecting method for kind of vehicle using microprocessor - Google Patents

Detecting method for kind of vehicle using microprocessor

Info

Publication number
JPS54108599A
JPS54108599A JP1579078A JP1579078A JPS54108599A JP S54108599 A JPS54108599 A JP S54108599A JP 1579078 A JP1579078 A JP 1579078A JP 1579078 A JP1579078 A JP 1579078A JP S54108599 A JPS54108599 A JP S54108599A
Authority
JP
Japan
Prior art keywords
road
wave
vehicle
variation
time
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
JP1579078A
Other languages
Japanese (ja)
Inventor
Akihiko Otani
Hiroshi Numata
Masao Mizuno
Original Assignee
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP1579078A priority Critical patent/JPS54108599A/en
Publication of JPS54108599A publication Critical patent/JPS54108599A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To detect accurately a vehicle under no influence of variation in ambient temperature by measuring the time from an ultrasonic transmission wave to its reflected reception wave by temperature-compensated clock pulses, and by discriminating it by a microprocessor.
CONSTITUTION: An ultrasonic signal from ultrasonic-wave generating device 101 is transmitted from transmitter-receiver 105 toward road surface L and a reflected wave from road surface L or vehicle CA is received by transmitter-receiver 105 again to be counted by external counter 110. Microprocessor 120 stores in RAM123 a reference time (updated constantly) of the reflection from road surface L, return time of a sound wave between vehicle-discrimination superior level H and road surface L, and allowable time for the variation of road surface L due to snow S, flickering, etc., and by using those, it is discriminated whether the output of counter 110 is for a reflected wave from road surface L or vehicle CA. Then, since the frequency of pulse generator 111 is varied by temperature detector 112 with ambient temperature, the variation in ultrasonic-wave speed due to the temperature variation is corrected, so that clock pulse for the time measurement will not cause any error detection.
COPYRIGHT: (C)1979,JPO&Japio
JP1579078A 1978-02-13 1978-02-13 Detecting method for kind of vehicle using microprocessor Pending JPS54108599A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1579078A JPS54108599A (en) 1978-02-13 1978-02-13 Detecting method for kind of vehicle using microprocessor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1579078A JPS54108599A (en) 1978-02-13 1978-02-13 Detecting method for kind of vehicle using microprocessor

Publications (1)

Publication Number Publication Date
JPS54108599A true JPS54108599A (en) 1979-08-25

Family

ID=11898622

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1579078A Pending JPS54108599A (en) 1978-02-13 1978-02-13 Detecting method for kind of vehicle using microprocessor

Country Status (1)

Country Link
JP (1) JPS54108599A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02151998A (en) * 1988-12-02 1990-06-11 Matsushita Electric Ind Co Ltd Ultrasonic type vehicle sensor for color district
US8055932B2 (en) * 2002-09-16 2011-11-08 Silicon Laboratories Inc. Precision oscillator for an asynchronous transmission system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02151998A (en) * 1988-12-02 1990-06-11 Matsushita Electric Ind Co Ltd Ultrasonic type vehicle sensor for color district
US8055932B2 (en) * 2002-09-16 2011-11-08 Silicon Laboratories Inc. Precision oscillator for an asynchronous transmission system
US8307237B2 (en) 2002-09-16 2012-11-06 Silicon Laboratories Inc Precision oscillator for an asynchronous transmission system

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