| 摘要 |
A sonic back-up proximity sensor employs a first sonic transducer and a second sonic transducer mounted on a rearward portion of a riding lawn mower to create three discrete zones of protection. The first sonic transducer has an associated first region of coverage, or sector, and the second sonic transducer has an associated second sector. The first sonic transducer and second sonic transducer are directed toward one another such that the first sector and second sector at least partially overlap. The overlapping portion of the first sector and second sector provides redundant coverage in an area directly behind the lawn mower. The non-overlapping portion of the first sector defines a second protection zone on one side of the lawn mower. The non-overlapping portion of the second sector defines a third protection zone on a second side of the lawn mower. By selectively transmitting, receiving and sequentially storing reflected sonic energy, a sonic back-up proximity sensor formed in accordance with the present invention determines the distance and position of an object located behind the riding lawn mower.
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