Electronic bale density controller

Details Electronic bale density controller Electronic bale density controller

A - Human Necessities

01

F

340/124, 342/22.

A01F 15/04 (2006.01) A01F 15/08 (2006.01) B30B 9/30 (2006.01) G01F 1/00 (2006.01) G01L 1/22 (2006.01)

Patent

CA 1313556

64077-76 ELECTRONIC BALE DENSITY CONTROLLER ABSTRACT OF THE DISCLOSURE An agricultural baling machine controls the density of bales of crop material discharged therefrom by monitoring the stress experienced by a reciprocably driven plunger assembly (22) employed to apply a compactive force to crop material introduced into a bale case (20). The bale case (20) is comprised of rails (54, 56) which are positionably adjustable in response to applied tension in a manner whereby the dimensions of the bale case (20) are changeable, thereby facilitating a change in the degree of resistance caused by the bale case (20) to crop material movement therein. Signals produced by stress sensors (124, 126, 128, 130) mounted relative to the plunger assembly (22) are analyzed by a programmed signal processor (200) which accordingly generates a control signal for controlling a servo valve (61). In response to the control signal the servo valve (61) governs the degree of ten- sion applied to the bale case rails (54, 56) and thereby adjusts the degree of resistance to crop movement in the bale case (20). The analysis performed by the signal processor (200) results in the generation of a pulse width modulated control signal that enables the servo valve (61) to adjust the degree of resistance to crop movement in the bale case (20) so that the stress experienced by the plunger assembly (22) is maintained near a predetermined level in accordance with desired bale density. Lest the bale case rail tension be too quickly adjusted during a period of insuffi- cient crop material ingestion, the signal processor (200) also monitors the quantity of crop material ingestation and precludes the increasing of tension application to the bale case rails (54, 64077-765 56) unless a predetermined minimum level of crop ingestation is being achieved. In this regard, the signal processor (200) ana- lyzes the signals from the stress sensors (124, 126, 128, 130) as a waveform and obtains therefrom an indication of the degree of bale slippage through the bale case (20), the degree of bale slip- page being related to the quantity of crop ingestation. Using the waveform the signal processor (200) also normalizes the indication of quantity ingestation with respect to a reference PTO speed.

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