Ranging sensor system for vehicle

• US 5,546,086 A
• Filed: 05/04/1994
• Issued: 08/13/1996
• Est. Priority Date: 05/12/1993
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Matsui, Hiroki, Fujita, Yasuhiko, Akuzawa, Kenji
• Primary Examiner(s): ELDRED, JOHN W
• Application Number:
  US08/237,908
• Time in Patent Office: 832 Days
• Field of Search: 340/435, 340/901, 340/904, 342/70, 342/71, 356/3, 356/27
• US Class Current: 342/70
• CPC Class Codes: B60T 7/22 initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle , or by means of contactless obstacle detectors mounted on the vehicle
• CPC Class Codes: G01S 17/931 of land vehicles

Abstract

In a ranging sensor system for a vehicle for calculating a physical data between a subject vehicle and an object on the basis of the time between the transmission of a signal toward the object and the reception of a signal reflected from the object, a first obtained detection data is set as an offset value in an offset value setting circuit. The offset value is subtracted from the detection data in a subtractor, and an output from the subtractor is filtered in a filter circuit. The offset value is added to an output from the filter circuit in an adder to provide a physical data after the filtering. Thus, it is possible to eliminate an error included in detection data, while insuring a responsiveness and a stability.

Claims

1. A ranging sensor system for a vehicle for calculating a physical data between a subject vehicle and an object on the basis of the time between the transmission of a signal toward the object and the reception of a signal reflected from the object, comprising:

detection means for detecting data representing a physical relationship between the subject vehicle and the object;

offset value setting means for setting an initial value of detection data output from the detection means as an offset value;

subtracting means for subtracting the offset value from a non-initial value of detection data;

filter means for filtering an output from said subtracting means; and

adding means for adding the offset value to an output from said filter means to provide a filtered value of physical data.

2. A radar sensor system for a vehicle according to claim 1, further comprising memory means for storing a plurality of values of detection data obtained over a predetermined period of time, and determining means for determining, when all values of detection data obtained for less than the predetermined period of time are zero, and when a new value of detection data obtained after said predetermined period of time is not zero, said new value as said initial value of detection data.