| 摘要 |
In an agricultural combine, a header terrain following system using a floati ng header having a frame, a support member supporting the frame from the ground, and a suspension variably supporting the frame from a feederhouse moveably attachi ng at the front of the combine. A lift cylinder supports and articulates the feederhouse from the combine, and a lift valve connects the lift cylinder to a main hydraulic circuit. A position sensor adapted to sense vertical position of the frame relative t o the feederhouse attaches to the floating header. A controller communicates with the lift valve and the position sensor. The controller maintains vertical position of the frame relative to the feederhouse at a nominal value by continuously reading the position sensor and commanding the lift valve to add or subtract hydraulic fluid in t he lift cylinder until position reads at the nominal value.
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