US 6,982,634 B2 | ||
Method and apparatus for reducing blind spots in obstacle detection | ||
Shih-Hsiung Li, 7F-5, No. 23, Sec. 1, Hangchow S. Rd., Taipei (Taiwan) | ||
Filed on Nov. 07, 2002, as Appl. No. 10/289,363. | ||
Prior Publication US 2004/0090316 A1, May 13, 2004 | ||
Int. Cl. B60Q 1/00 (2006.01) |
U.S. Cl. 340—435 | 14 Claims |
1. A method for reducing blind spots in obstacle detection as a vehicle moves in reverse comprising the steps of:
setting up of two transducers with a wide transmission angle at the rear of the vehicle; and
adoption of channel switching means to allow only one transducer to be in a transmission mode and one transducer to be in
a reception mode, while ignoring all ringing signals remaining in a predetermined time frame to prevent cross talk of signals
and false triggering of an alarm;
wherein the predetermined time (t) is equal to the closest distance between the two transducers divided by a transmission
speed of ultrasonic signals in the air.
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