Automotive rear safety detection system

• US 5,650,765 A
• Filed: 07/22/1994
• Issued: 07/22/1997
• Est. Priority Date: 07/22/1994
• Status: Expired due to Fees

• Current Assignee: Tae Soo Park
• Original Assignee: Tae Soo Park
• Inventors: Park, Tae Soo
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): Lefkowitz, Edward
• Application Number:
  US08/279,014
• Time in Patent Office: 1,096 Days
• Field of Search: 340/435, 340/436, 340/901, 340/903, 340/904, 367/112, 367/909, 367/93, 180/169
• US Class Current: 340/436
• CPC Class Codes: B60Q 9/007 providing information about the distance to an obstacle, e.g. varying sound
• CPC Class Codes: G01S 15/931 of land vehicles
• CPC Class Codes: G01S 2013/9317 Driving backwards
• CPC Class Codes: G01S 2015/938 in the bumper area radar in bumper area G01S2013/93275; bumper with obstacle sensor of electric or electronic type B60R19/483
• CPC Class Codes: Y10S 367/909 Collision avoidance

Abstract

An automotive rear detection system which assists a driver by informing whether an obstacle is present when the vehicle is in a reverse motion. The alarm is activated by transmitting an audible noise to warn the driver. The signals are monitored by detectors which uses frequency modulation current wave mode to recognize whether objects are present within approximately eight feet regardless if it is in motion or not. The detectors send a signal to a control box mounted inside the vehicle which activates the alarm.

Claims

1. A safety detection system for attachment to an automobile, said safety detection system comprising:

a constant frequency ultrasonic isosceles wave generating generator connected to be energized from the automobile;

first and second outputs from said constant frequency isosceles wave generating generator;

an ultrasonic radiator for mounting on the automobile and connected to said first output for generating ultrasonic acoustic waves adjacent the automobile so that obstructions adjacent the automobile reflect ultrasonic waves back toward the automobile;

an ultrasonic receiver for mounting on the automobile, said ultrasonic receiver receiving ultrasonic waves and converting them to corresponding electrical signals;

means for subtracting said second output from said constant frequency isosceles wave ultrasonic wave generator from the received signal to produce a resultant isosceles triangle wave train which has a frequency corresponding to the difference in frequency between the transmitted ultrasonic signal and the received ultrasonic signal, a low pass filter, said wave train being connected through said low pass filter to filter out substantially all ultrasonic signal so that the resultant wave train has a frequency and amplitude which is a direct function of the difference between the frequency of the radiated signal and the frequency of the received signal; and

a counter for counting the frequency of the wave train from said low pass filter and an alarm connected to said counter so that when said counter detects a frequency of said wave train above a reference frequency, said alarm is energized.