Combine head position control system with float override

Details Combine head position control system with float override Combine head position control system with float override

1994-06-24

1995-12-05

Melius, Terry Lee

Harvesters

Motorized harvester

With condition-responsive operation

56208, 56DIG3, 56DIG15, A01D 3486, A01D 7528

Patent

active

054718252

ABSTRACT:
An electronic control system for controlling the position of a combine harvesting head operable over a surface is disclosed herein. The position is normally controlled based upon the monitored position of the head. However, the position is controlled based upon the force or pressure at which the surface is supporting the implement if this force exceeds a predetermined limit. Thus, the system provides for float control override of position control. In particular, a hydraulic positioning assembly positions the head relative to the combine based upon control signals produced by a digital control circuit. The digital control circuit monitors digital signals representative of the head position and the force at which the surface is supporting the head, and compares these signals with digital setpoint data. Based upon the comparison, the control circuit produces control signals for causing the positioning assembly to raise or lower the harvesting head relative to the surface based upon force when the force limit is exceeded and based upon position when the force is below the force limit.

REFERENCES:
patent: 4332126 (1982-06-01), Van Auwelaer et al.
patent: 4437295 (1984-03-01), Rock
patent: 4594840 (1986-06-01), D'Almeida et al.
patent: 4641490 (1987-02-01), Wynn et al.
patent: 4724661 (1988-02-01), Blakeslee et al.
patent: 4733523 (1988-03-01), Dedeyne et al.
patent: 4942724 (1990-07-01), Diekhans et al.
patent: 5359836 (1994-11-01), Zeuner et al.
SAE Technical Paper Series 941799-Electro-Hydraulic Header Control for Combine Harvesters (Sep.-1994).

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