Title:
【発明の名称】車載用超音波検知器
Document Type and Number:
Japanese Patent JP3101106
Kind Code:
B2
Abstract:
PURPOSE:To give an alarm display to a driver when vehicle speed is equal to or smaller than a specific value and to stop it when the vehicle speed exceeds the specific value and at the same time to calculate and display the traveling distance and the traveling direction of a vehicle by calculating the vehicle speed from the Doppler constituent of a reflection signal from an object or a road surface. CONSTITUTION:Ultrasonic detectors 11-14 which are provided at the corner part around a vehicle are controlled by a body circuit 2, transmit ultrasonic pulses according to the wave-transmission signal from the circuit 2, and then receive and amplify the reflection wave from an obstacle or a human body. The output is shaped into a pulse waveform by a comparator 4, is input to input terminals R1-R4 of a CPU 7, and is input to input terminals C1-C4 of the CPU 7 after the pulse wave is counted for 10 wavelengths. After ultrasonic pulses are output, the CPU 7 counts a time T1 until reflection wave pulses are input and then counts a time T2 for 10 wavelengths. When the vehicle speed which is calculated from the time T2 is equal to or less than approximately 10km/hour, an alarm display such as an obstacle and a human body is output. When it is equal to or more than approximately 10km, the display output is turned off and the traveling distance and traveling direction are calculated from the vehicle speed and are displayed.
Inventors:
Naoya Higashi
Hajime Sasaki
Hajime Sasaki
Application Number:
JP34219392A
Publication Date:
October 23, 2000
Filing Date:
December 22, 1992
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G01S15/87; B60W30/00; G01S15/50; G01S15/93; G08G1/16; (IPC1-7): G01S15/93; G01S15/50
Domestic Patent References:
| JP5172943A | ||||
| JP1101488A | ||||
| JP63208783A | ||||
| JP2148487U |
Attorney, Agent or Firm:
Keisei Nishikawa (1 person outside)