Obstacle detection device for vehicle
First Claim
1. An obstacle detection device for a vehicle comprising:
- radar means which radiates transmitted waves outside the vehicle and detects reflected waves of the transmitted waves;
sensing means which senses a distance to an obstacle around the vehicle based on a result of detection of the reflected waves by the radar means;
determining means which determines a limit distance within which the sensing means is capable of sensing, wherein the determining means determines the limit distance based on a result of detection of reflected waves whose signal level is lower than a preset signal level; and
judging means which compares the limit distance determined by the determining means with a preset sensing reference distance and thereby judges an operating state of the device, wherein the sensing means includes signal level judging means which judges a signal level of the reflected waves.
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Abstract
If the maximum time width Lt of the intensity of received light of reflected waves from a vehicle ahead is smaller than a reference time width, it is judged that the vehicle ahead is positioned in proximity to the detection limit distance of an obstacle detection device for vehicle. Thus, there is no problem, for example, even if a cut-in vehicle is present in reality between the vehicle ahead and the vehicle of interest and nevertheless, the distance to the cut-in vehicle cannot be detected. It can be judged whether the vehicle ahead is positioned in proximity to the detection limit distance of the device by judging the magnitude relation between Lt and the reference time width. As a result, the detecting capability of the device can be judged with accuracy.
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Citations
7 Claims
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1. An obstacle detection device for a vehicle comprising:
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radar means which radiates transmitted waves outside the vehicle and detects reflected waves of the transmitted waves;
sensing means which senses a distance to an obstacle around the vehicle based on a result of detection of the reflected waves by the radar means;
determining means which determines a limit distance within which the sensing means is capable of sensing, wherein the determining means determines the limit distance based on a result of detection of reflected waves whose signal level is lower than a preset signal level; and
judging means which compares the limit distance determined by the determining means with a preset sensing reference distance and thereby judges an operating state of the device, wherein the sensing means includes signal level judging means which judges a signal level of the reflected waves. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification