Geographic surface altering implement control system
First Claim
1. A tilt angle control system for a geographic surface altering implement, comprising:
- a frame;
first and second fluid operated lift jacks each having first and second end portions and each being connected at said first end portion to said frame and at said second end portion to said implement, said second end portion of the first and second lift jacks being spaced from each other a preselected distance at the implement connection, said second end portion of the first and second lift jacks being movable relative to the first end portion of the first and second lift jacks, respectively, and said implement being movable relative to the frame in response to movement of at least one of the lift jacks second end portion;
first sensing means for sensing the position of the second end portion of the first lift jack relative to the first end portion of the first lift jack and delivering a responsive first position signal;
second sensing means for sensing the position of the second end portion of the second lift jack relative to the first end portion of the second lift jack and delivering a responsive second position signal;
control means for receiving said first and second position signals, determining a magnitude of difference between the relative positions of the second end portion of the first and second lift jacks, calculating a tilt angle based on the relative difference, and delivering a calculated tilt angle signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A tilt angle control system has first and second sensors for sensing the position of the rod end portion of first and second lift jacks. A controller calculates an actual tilt angle of an implement connected to the rod end portions of the lift jacks based on a difference in the amount of extension relative to a baseline. A display device displays the actual and desired tilt angles. The controller compares the actual tilt angle to a desired tilt angle and actuates a fluid operated system to move one of the first and second jacks in response to a difference between the desired and actual tilt angles. An inclinometer sensed angle of the machine relative to a horizontal plane is added to the actual tilt angle to correct the actual tilt angle of the implement. The tilt angle control system is particularly suited for use on a bulldozer.
43 Citations
27 Claims
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1. A tilt angle control system for a geographic surface altering implement, comprising:
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a frame; first and second fluid operated lift jacks each having first and second end portions and each being connected at said first end portion to said frame and at said second end portion to said implement, said second end portion of the first and second lift jacks being spaced from each other a preselected distance at the implement connection, said second end portion of the first and second lift jacks being movable relative to the first end portion of the first and second lift jacks, respectively, and said implement being movable relative to the frame in response to movement of at least one of the lift jacks second end portion; first sensing means for sensing the position of the second end portion of the first lift jack relative to the first end portion of the first lift jack and delivering a responsive first position signal; second sensing means for sensing the position of the second end portion of the second lift jack relative to the first end portion of the second lift jack and delivering a responsive second position signal; control means for receiving said first and second position signals, determining a magnitude of difference between the relative positions of the second end portion of the first and second lift jacks, calculating a tilt angle based on the relative difference, and delivering a calculated tilt angle signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A tilt angle control system for a geographic surface altering implement, comprising:
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a frame; first and second fluid operated lift jacks each having first and second end portions and each being connected at said first end portion to said frame and at said second end portion to said implement, said second end portion of the first and second lift jacks being spaced from each other a preselected distance at the implement connection, said second end portion of the first and second lift jacks being movable relative to the first end portion of the first and second lift jacks, respectively, and said implement being movable relative to the frame in response to movement of at least one of the lift jacks second end portion; first sensing means for sensing the position of the second end portion of the first lift jack relative to the first end portion of the first lift jack and delivering a responsive first position signal; second sensing means for sensing the position of the second end portion of the second lift jack relative to the first end portion of the second lift jack and delivering a responsive second position signal; third sensing means for sensing an angle of the frame relative to the horizontal and delivering a responsive frame angle signal; control means for receiving said frame angle signal, said first position signal, and second position signal, determining a magnitude of difference between the relative positions of the second end portion of the first and second lift jacks based on said first and second position signals, calculating a tilt angle based on the magnitude of difference and the preselected distance at the implement connection, combining the frame angle and the tilt angle and delivering a responsive corrected tilt angle signal representative of a corrected implement tilt angle. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification