Earth working – Automatic power control – Land leveller type
Patent
1991-03-01
1992-04-28
Reese, Randolph A.
Earth working
Automatic power control
Land leveller type
172789, 172 1, 180136, E02F 384
Patent
active
051079321
ABSTRACT:
A method and apparatus are disclosed for controlling the cross slope angle cut by the blade of an articulated frame motorgrader being steered through a turn, operated in a straight frame mode, in a crabbed steering position and/or traveling in a non-horizontal plane. The blade angle is sensed and controlled such that the sensed blade angle is maintained substantially equal to a calculated blade angle. In a first embodiment, the blade angle calculation is performed using the equation: tan BS=(sin .tau.')(tan R)+(cos .tau.')(tan CS) where BS is the required blade slope angle of said blade relative to horizontal; .tau.' is a rotational angle of the blade with respect to the blade's direction of travel projected into horizontal; R is an angle between the blade's direction of travel and horizontal; and CS is the desired cross slope angle which is entered by an operator of the motorgrader. In a further embodiment, the blade angle calculation is performed using the equation: tan BS=(sin .tau.")(tan R')+(cos .tau.")(tan CS) where BS is the required blade slope angle of the blade relative to horizontal; R" is the rotational angle of the blade with respect to the blade's direction of travel projected into horizontal with the lateral slope angle of the front steering unit set equal to zero; R' is an angle between horizontal and the direction of travel of the blade with the lateral slope angle of the front steering unit set equal to zero; and CS is the desired cross slope angle.
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"CAT Automatic Blade Control", Brochure, Caterpillar Tractor Co., Oct. 1979.
Kidwell Michael H.
Zachman Mark E.
Reese Randolph A.
Spectra-Physics Laserplane, Inc.
Thompson Jeffrey L.
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