Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Construction or agricultural-type vehicle
Reexamination Certificate
2005-05-17
2005-05-17
Beaulieu, Y. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Construction or agricultural-type vehicle
Reexamination Certificate
active
06895319
ABSTRACT:
A hydraulic function can be extended and retracted under the control of an electrohydraulic valve unit. An operator movable command lever is movable into extend, center and retract region. A sensor generates a lever position signal. An electronic lever command unit receives the lever position signal and generates a valve command signal. An electronic valve control unit is remote from and communicated with the lever command unit. The electronic valve control unit controls communication of hydraulic fluid to the hydraulic function in response to the valve command signal. A method of generating the valve command signal includes generating a command signal which is proportional to the lever position signal when the lever is moved relatively slowly, and generating a command signal which is based on a maximum excursion of the lever into the extend and retract regions when the lever is moved relatively rapidly. Command signals are transmitted to the valve control unit after a delay time period which is a fraction of a period of the lever movement oscillation.
REFERENCES:
patent: 4923362 (1990-05-01), Fryk
patent: 5477770 (1995-12-01), Ono et al.
patent: 6105679 (2000-08-01), Schubert et al.
Alexander William Guy
Boege David James
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