Screed slope controller for a paver
First Claim
1. A controller for controlling the slope of a screed supported by support arms wherein the screed is moved over a distance, comprising:
- first means for developing a first sensor signal representing the slope of the screed;
second means for developing a second sensor signal representing the slope of the support arms;
third means coupled to the first developing means for developing an integrated error signal from the first sensor signal and a slope command signal indicative of a desired screed slope;
a summer coupled to the second and third developing means which sums the integrated error signal with the second sensor signal to develop a second error signal; and
means responsive to the second error signal for adjusting the slope of the support arms.
4 Assignments
0 Petitions
Accused Products
Abstract
A controller for controlling the slope of a screed supported by support arms wherein the screed is moved over a distance includes a first slope sensor which develops a first sensor signal representing the slope of the screed, a second slope sensor which develops a second sensor signal representing the slope of the support arms and a first summer which sums the first sensor signal and command signal indicative of a particular screed slope to develop a first error signal. An integrator integrates the error signal over distance to develop an integrated first error signal. A second summer sums the integrated first error signal with the second sensor signal to develop a second error signal which is utilized to control actuators which adjust the slope of the support arms.
37 Citations
16 Claims
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1. A controller for controlling the slope of a screed supported by support arms wherein the screed is moved over a distance, comprising:
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first means for developing a first sensor signal representing the slope of the screed; second means for developing a second sensor signal representing the slope of the support arms; third means coupled to the first developing means for developing an integrated error signal from the first sensor signal and a slope command signal indicative of a desired screed slope; a summer coupled to the second and third developing means which sums the integrated error signal with the second sensor signal to develop a second error signal; and means responsive to the second error signal for adjusting the slope of the support arms. - View Dependent Claims (2, 3, 4, 5)
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6. A controller for controlling the slope of a screed towed by tow arms connected to a tractor at tow points wherein the screed is towed over a distance and wherein the elevations of the tow points are adjustable, comprising:
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a first slope sensor for developing a first sensor signal representing the transverse slope of the screed; a second means slope sensor for developing a second sensor signal representing the slope of the tow arms; a first summer coupled to the first slope sensor which sums the first sensor signal and a slope command signal indicative of a particular desired screed slope to develop a first error signal; an integrator coupled to the first summer which integrates the first error signal over distance to develop an integrated error signal; a second summer coupled to the integrator and the second slope sensor which sums the integrated error signal with the second sensor signal to develop a second error signal; and means coupled to the second summer and responsive to the second error signal for adjusting the relative elevation of the tow points. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of controlling the slope of a screed towed over a distance by a tractor having tow arms connected to the tractor at tow points wherein the elevations of the tow points are adjustable, comprising the steps of:
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developing a first sensor signal representing the transverse slope of the screed; developing a second sensor signal representing the transverse slope of the tow arms at a particular point along the tow arms; summing the first sensor signal and a slope command signal representing a particular desired screed slope to develop a first error signal; integrating the first error signal over distance to develop an integrated error signal; summing the integrated error signal with the second sensor signal to develop a second error signal; and operating an actuator connected to each tow point to adjust the relative elevations thereof in accordance with the second error signal to in turn control the slope of the screed. - View Dependent Claims (15, 16)
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Specification