| 摘要 |
The present invention provides a leveling control system for a forestry m achine (10) employing position sensors that relay information about the orie ntation of the carriage (12) in relation to the swing-house assembly (14) in order to control roll and pitch in a manner that maximizes the operating en velop of the leveling mechanism (38). The angles of pitch and roll of the sw ing-house assembly (14) in relation to the carriage (12) are measured and/or calculated and a controller (24) limits operation of the leveling mechanism (38) to an operating envelop that may be described in terms of pitch and dr oll. The cylinders (54, 56) are decelerated gradually as the operating envel op is approached. The controller (24) can include an automatic leveling mode . The controller (24) can change the function of the fore, aft, left and rig ht operator controls so that they are true from the operator's frame of refe rence regardless of the rotary position of the cab relative to the carriage (12).
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