Patent ID: 8180532
Filing Date: 2012-05-15
Classification: B60G,B62D,E02F

Abstract:
1. A forestry machine comprising: a cab; a boom; a forestry implement mounted to the boom; a swing-house assembly supporting the cab and boom; a turntable assembly supporting the swing-house assembly, the swing-house assembly rotatable about the turntable assembly; a carriage configured for off-road travel; a leveling mechanism mounted to the carriage and supporting the turntable assembly, the leveling mechanism including a plurality of hydraulic cylinders configured to reposition the turntable assembly relative to the carriage; a first sensor configured to sense a first parameter related to an orientation of the turntable assembly relative to the carriage; a second sensor configured to sense a second parameter related to the orientation of the turntable assembly relative to the carriage; an operator input device positioned in the cab, the operator input device configured to generate a command signal; and a controller programmed with an operating envelope, the controller configured to determine a pitch from at least the first parameter, determine a roll from at least the second parameter, receive the command signal and control the leveling mechanism as directed by the command signal and keep the leveling mechanism within the operating envelope by continuously monitoring the pitch and roll and prohibiting operation outside of the operating envelope.