| 摘要 |
A pressure sensing system for a seeding machine such as a planter to measure the down force on a planter row unit uses a wireless pressure sensor embedded in a load carrying wheel of the row unit. In a preferred embodiment, the pressure sensor is a passive piezoelectric pressure sensor that is a transmitter only, transmitting both pressure and RFID the information that identifies the particular sensor. Multiple sensors may be employed in each wheel and sensors may be employed in more than one wheel of the row unit, such as the gauge wheels on opposite sides of the trench opening disks. The sensors may be made of a PVDF, a known piezoelectric material. A wireless receiver is located on the planter frame or could be located elsewhere to receive the signals from the pressure sensor. A controller determines from the signal, any change in down force and commands the change to a down force generator on the row unit.
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