| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle for farm work which can do farm work accurately with simple devices which can easily calculate its accurate mileage and position. SOLUTION: This vehicle for farm work is equipped with a ultrasonic wave transmitter/receiver, a detecting device which detects a difference between transmitted ultrasonic waves and received ultrasonic waves, a calculating/ indicating device which calculates its mileage by calculating its running speed based on the differences between the transmitted ultrasonic waves and the received ones and then instructs to do designated work on a difference between the mileage calculated and the designated working position, and a working device to do designated work based on instruction from the calculating/ indicating device. And the vehicle is fixed at a position where the ultrasonic transmitter/receiver is able to transmit/receive ultrasonic waves to/from a designated field.
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