Obstacle recognition system for a vehicle

• US 5,574,463 A
• Filed: 05/24/1995
• Issued: 11/12/1996
• Est. Priority Date: 05/26/1994
• Status: Expired due to Term

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Nishimura, Takao, Shirai, Noriaki, Hibino, Katsuhiko
• Primary Examiner(s): Sotomayor, John B.
• Application Number:
  US08/449,116
• Time in Patent Office: 538 Days
• Field of Search: 342/70, 342/71, 342/72, 342/107, 342/109, 342/110, 342/115, 342/157, 342/158, 342/90
• US Class Current: 342/70
• CPC Class Codes: G01S 13/93 for anti-collision purposes
• CPC Class Codes: G01S 17/931 of land vehicles
• CPC Class Codes: G01S 7/412 based on a comparison between measured values and known or stored values
• CPC Class Codes: G01S 7/4802 using analysis of echo signal for target characterisation; Target signature; Target cross-section
• CPC Class Codes: G01S 7/481 Constructional features, e.g. arrangements of optical elements
• CPC Class Codes: G01S 7/4817 relating to scanning

Abstract

A radar device emits a wave beam into a given angular range outside a vehicle, and scans the given angular range by the wave beam. The radar device detects a reflected wave beam. A recognizing device is operative for recognizing an obstacle with respect to the vehicle on the basis of the result of detection of the reflected wave beam by the radar device. In the recognizing device, a point recognizing section recognizes obstacles as points, and a uniting section is operative for uniting adjacent points among the points provided by the point recognizing section. The uniting section provides sets each having adjacent points. A line-segment recognizing section is operative for detecting a specific set or specific sets of adjacent points among the adjacent-point sets provided by the uniting section, and for recognizing every detected specific set as a line segment having a length only along a width direction of the vehicle. Every specific set has a length smaller than a given length along a longitudinal direction of the vehicle. A position estimating section estimates the position of a line segment, which will be provided by the line-segment recognizing section, in response to the position of a previously-provided line segment. An identity judging section is operative for comparing the line-segment position estimated by the position estimating section and the position of a line segment currently provided by the line-segment recognizing section to judge whether or not the line segment currently provided by the line-segment recognizing section and the previously-provided line segment are the same.

Claims

1. An obstacle recognition system for a vehicle, comprising:

a) radar means for emitting a wave beam into a given angular range outside the vehicle and scanning the given angular range by the wave beam, and for detecting a reflected wave beam; and

b) recognizing means for recognizing an obstacle with respect to the vehicle on the basis of the result of detection of the reflected wave beam by the radar means;

wherein the recognizing means comprises;

b1) point recognizing means for recognizes obstacles as points on the basis of the result of detection of the reflected wave beam by the radar means;

b2) uniting means for uniting adjacent points among the points provided by the point recognizing means, and for providing sets each having adjacent points;

b3) line-segment recognizing means for detecting a specific set or specific sets of adjacent points among the adjacent-point sets provided by the uniting means, and for recognizing every detected specific set as a line segment having a length only along a width direction of the vehicle, wherein every specific set has a length smaller than a given length along a longitudinal direction of the vehicle;

b4) position estimating means for estimating the position of a line segment, which will be provided by the line-segment recognizing means, in response to the position of a previously-provided line segment; and

b5) identity judging means for comparing the line-segment position estimated by the position estimating means and the position of a line segment currently provided by the line-segment recognizing means to judge whether or not the line segment currently provided by the line-segment recognizing means and the previously-provided line segment are the same.

2. An obstacle recognition system for a vehicle, comprising:

a) radar means for emitting a wave beam into a given angular range outside the vehicle and scanning the given angular range by the wave beam, and for detecting a reflected wave beam; and

b) recognizing means for recognizing an obstacle with respect to the vehicle on the basis of the result of detection of the reflected wave beam by the radar means;

wherein the recognizing means comprises;

b1) point recognizing means for recognizes obstacles as points on the basis of the result of detection of the reflected wave beam by the radar means;

b2) uniting means for uniting adjacent points among the points provided by the point recognizing means, and for providing sets each having adjacent points;

b3) line-segment recognizing means for recognizing each of the adjacent-point sets as a line segment having a length only along a width direction of the vehicle;

b4) position estimating means for estimating the position of a line segment, which will be provided by the line-segment recognizing means, in response to the position of a previously-provided line segment;

b5) identity judging means for comparing the line-segment position estimated by the position estimating means and the position of a line segment currently provided by the line-segment recognizing means to judge whether or not the line segment currently provided by the line-segment recognizing means and the previously-provided line segment are the same; and

b6) line-segment excepting means for, in cases where the number of line segments currently provided by the line-segment recognizing means exceeds a given number, detecting a specific line segment or specific line segments among the currently-provided line segments and excluding the specific line segment or at least one of the specific line segments from a next position estimating process and a next identity Judging process executed by the position estimating means and the identity judging means, wherein the specific line segment or the specific line segments are judged by the identity judging means as being different from previously-provided line segments.

3. The obstacle recognition system of claim 2, wherein the line-segment excepting means is operative for, in cases where the number of line segments currently provided by the line-segment recognizing means exceeds the given number, sequentially excluding the specific line segments in the order according to the degrees of the separations of the specific line segments from the vehicle, wherein the number of the excluded specific line segments is equal to the total number of the line segments provided by the line-segment recognizing means minus the given number.