Blade tilt angle limiting function for a bulldozer

Details Blade tilt angle limiting function for a bulldozer Blade tilt angle limiting function for a bulldozer

1996-09-05

1998-06-23

Carone, Michael J.

Earth working

Automatic power control

Land leveller type

172826, 36442407, E02F 376

Patent

active

057691681

ABSTRACT:
A control system regulated the tilt of an implement of an earlier working machine. Fluid operated lift and tilt cylinders are connected to the implement. Hydraulic control valves deliver pressurized hydraulic fluid to the lift and tilt cylinders. A control lever produces an implement tilt command signal in response to position of the control lever. A controller receives the implement tilt command signal and responsively delivers an implement tilt control signal to the hydraulic valves to cause pressurized fluid flow to actuate at least one of the lift and tilt cylinders to tilt the implement. First and second displacement sensors produce first and second position signals indicative of the extension of the respective lift cylinders. The controller receives the first and second position signals, determines a magnitude of the difference between the relative positions of the first and second lift cylinders, compares the magnitude difference to a maximum differential value, and stops the delivery of the implement tilt control signal in response to the magnitude difference being substantially equal to the maximum differential value.

REFERENCES:
patent: 5088020 (1992-02-01), Nishida et al.
patent: 5462125 (1995-10-01), Stratton et al.
patent: 5467829 (1995-11-01), Barton et al.
patent: 5499684 (1996-03-01), Stratton
patent: 5551518 (1996-09-01), Stratton

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