Patent ID: 7762013

Claim:
A control system for controlling an actuator used to plunge an excavation attachment into the ground, the excavation attachment powered by an attachment drive having a rotational drive speed, wherein the excavation attachment includes a boom pivotally moveable relative to a vehicle, wherein the attachment drive drives a rotational cutting structure mounted on the boom, and wherein the actuator pivots the boom relative to the vehicle to plunge the excavation attachment, the control system comprising: an electronic controller that generates an actuator output signal for controlling plunging of the excavation attachment by the actuator, the electronic controller defining a band of rotational drive speeds within which a magnitude of the actuator output signal is automatically increased by the electronic controller with an increasing rotational drive speed of the attachment drive and the magnitude of the actuator output signal is automatically decreased by the electronic controller with a decreasing rotational drive speed of the attachment drive.