Method and apparatus for controlling the slope of a blade on a m

Details Method and apparatus for controlling the slope of a blade on a m Method and apparatus for controlling the slope of a blade on a m

1990-05-29

1992-01-07

Taylor, Dennis L.

Earth working

Automatic power control

Land leveller type

37DIG14, 37DIG20, E02F 376

Patent

active

050782150

ABSTRACT:
A method and apparatus is provided for controlling the parallel blade slope angle of a blade in order to maintain a desired cross slope during normal operation of a motorgrader regardless of whether the motorgrader is turning, the front wheels are side-tilted or the blade supporting A-frame is side-shifted. The present invention controls the cross slope angle cut by the blade of a motorgrader by substantially continuously sensing the perpendicular slope angle of the blade by means of a slope sensor and the angle of rotation of the blade relative to the direction of the travel by means of a noncontact sensor. The sensed angles are used to calculate the parallel slope angle of the blade relative to horizontal which is required to maintain a desired cross slope angle. The parallel slope angle is sensed by means of the slope sensor and controlled such that it is maintained substantially equal to the calculated parallel slope angle to thereby define the desired cross slope angle set by an operator.

REFERENCES:
patent: 3786871 (1974-01-01), Long et al.
patent: 3791452 (1974-02-01), Long et al.
patent: 4081033 (1978-03-01), Bulger et al.
patent: 4156466 (1979-05-01), Caldwell
patent: 4213503 (1980-07-01), Elmberg et al.
patent: 4431060 (1984-02-01), Scholl et al.
patent: 4545439 (1985-10-01), Sollett et al.
patent: 4696486 (1987-09-01), Ruhter
patent: 4918608 (1990-03-01), Middleton et al.
patent: 4924374 (1990-05-01), Middleton et al.
patent: 4926948 (1990-05-01), Davidson et al.
Cat Automatic Blade Control, 10-1979.

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