Title:
PULSE TYPE ULTRASONIC SENSOR APPARATUS AND METHOD FOR DETERMINING WAVE TRANSMISSION INTERVAL IN PULSE TYPE ULTRASONIC SENSOR APPARATUS
Document Type and Number:
Japanese Patent JP3463454
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To set a wave transmission interval to be the shortest value in accordance with use conditions of an ultrasonic sensor apparatus.
SOLUTION: A predetermined time ΔT is set to be not shorter than a period obtained by subtracting a monitoring period Tc from a reflection wave-mixing period tr, and at the same time, not larger than a period obtained by subtracting an ultrasonic wave transmission pulse width tW from the reflection wave-mixing period tr. In each case where an ultrasonic wave transmission interval is set to be (T-ΔT), T, (T+ΔT), detection results of reflection waves in the respective monitoring period Tc are checked. Moreover, the T is increased or decreased by every predetermined value ΔT from an optional value. A time T when the reflection waves are detected is determined as the wave transmission interval only in the case of (T-ΔT) among the three transmission intervals.
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Inventors:
Goro Oda
Yuji Nakagawa
Toshimasa Takagi
Mabu Uno
Hideki Kawahara
Yuji Nakagawa
Toshimasa Takagi
Mabu Uno
Hideki Kawahara
Application Number:
JP10172996A
Publication Date:
November 05, 2003
Filing Date:
April 23, 1996
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G01V1/00; G01S7/524; G01S15/04; G08G1/04; (IPC1-7): G01S15/04; G01S7/524; G01V1/00; G08G1/04
Domestic Patent References:
| JP572334A | ||||
| JP2196986A | ||||
| JP51104783A |
Attorney, Agent or Firm:
Hiroyuki Nakai
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