Closed-loop combine header height control

Details Closed-loop combine header height control Closed-loop combine header height control

1977-01-07

1979-01-30

Kinsey, Russell R.

Harvesters

Platform adjustments

56 102, 56DIG15, A01D 7528

Patent

active

041365089

ABSTRACT:
A closed-loop height control for the header of a combine harvester permits adjustment of height setpoint and deadband from the operator's platform without stopping the combine. A variable capacitance is rotated in accordance with minimum clearance between header and ground to generate a continuous electrical header height signal which is compared to a setpoint signal indicative of desired header height to derive a height error signal whose value is at a null level when actual header height is equal to desired height indicated by the setpoint signal and which deviates in both magnitude and direction from the null level as a function of the variation between actual header height and setpoint height. Raise and lower command signals are derived in response to a predetermined deviation of the height error signal in opposite directions respectively from the null level by first and second Schmitt trigger circuits having switching levels which respectively are greater than and less than the null value. A logic circuit controls transmittal of the raise and lower command signals to electrohydraulic power means for raising and lowering the header, and the operator need only actuate a single raise-lower switch at the operator's platform to select whether the logic circuit is in an automatic mode in which the command signals are transmitted or a standby mode in which they are blocked from the power means.

REFERENCES:
patent: 3623301 (1971-11-01), Hofier
patent: 3722193 (1973-03-01), Strubbe
patent: 3789939 (1974-02-01), Geislinger
patent: 3805798 (1974-04-01), Girodat
patent: 3851451 (1974-12-01), Agness et al.
patent: 3886718 (1975-06-01), Talbot
patent: 3889249 (1975-06-01), Bennett, Jr. et al.
patent: 3906710 (1975-09-01), Pask
patent: 3908345 (1975-09-01), Oni et al.
patent: 3991618 (1976-11-01), Stampter et al.
patent: 4004289 (1977-01-01), Kirk

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