Patent ID: 7930843

Claim:
A control system for controlling propulsion of a vehicle over a ground surface by a vehicle propulsion system, the vehicle including an excavation attachment having a active portion powered by an attachment hydrostatic drive, the active portion including a plurality of cutting teeth, the attachment hydrostatic drive including a hydraulic pump and a hydraulic motor, the control system comprising: an electronic controller that generates a vehicle propulsion drive signal for controlling propulsion of the vehicle by the vehicle propulsion system, wherein during excavation operations: a) the vehicle propulsion system causes the active portion of the excavation attachment to be driven into unexcavated ground while the attachment hydrostatic drive moves the active portion of the excavation attachment in a cutting motion adapted for breaking-up the ground; and b) the electronic controller uses a hydraulic pressure of the attachment hydrostatic drive as a feedback variable for automatically modifying the vehicle propulsion drive signal.