Object detecting apparatus, opening and closing control system for vehicle using object detecting apparatus, and method of detecting upstroke of envelope
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United States of America Patent
Stats
-
Aug 16, 2011
Grant Date -
Oct 1, 2009
app pub date -
Mar 24, 2009
filing date -
Mar 27, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An object detecting apparatus detecting an object position based on a reflected wave generated by reflection of a transmitted ultrasonic wave from the object includes a transmitting portion transmitting the ultrasonic wave, a receiving portion receiving the ultrasonic waves as received signals, a detecting position detecting an envelope and an operation portion detecting a peak of each envelope and obtaining an approximate line with a maximum change amount of the envelope in a change amount increasing period set to a gradient of the approximate line, provided that the change amount increasing period is defined as a period that an amount of change per a predetermined unit time of the envelope, heading to the peak, continues to increase, the operation portion obtaining a time that a voltage value of the approximate line equals a reference value as a receipt time and detecting the object position based on the receipt time.
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Family
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Cited Art Landscape
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