Electromagnetic valve control device and work vehicle
AssigneeKubota Corporation
InventorsTetsuo Yamaguchi, Ryoma Iwase
Life of this patent
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Abstract
An electromagnetic valve control device includes a control signal generator to, through feedback control involving an environmental coefficient, generate a control signal intended for at least one electromagnetic valve and corresponding to a target electric current value, a coefficient determiner to determine an environmental coefficient during a learning period from a start of a driver operation to an end of a predetermined time, and an operation limiter to limit respective operations of the at least one electromagnetic valve and a gear transmission during the learning period.
Claims9
An electromagnetic valve control device to control an angle of a swash plate of a hydrostatic continuously variable transmission device with use of at least one electromagnetic valve, when the hydrostatic continuously variable transmission device varies motive power from a driver, and a gear transmission composites motive power from the driver and the varied motive power from the hydrostatic continuously variable transmission device, varies the composite motive power, and outputs the varied composite motive power, the electromagnetic valve control device comprising:
- a control signal generator to, through feedback control involving an environmental coefficient, generate a control signal intended for the at least one electromagnetic valve and corresponding to a target electric current value;
- a coefficient determiner to determine the environmental coefficient during a learning period from a start of the driver to an end of a predetermined time;
- and
- an operation limiter to limit respective operations of the at least one electromagnetic valve and the gear transmission during the learning period.
A work vehicle, comprising:
- a driver;
- a hydrostatic continuously variable transmission device to vary motive power from the driver and output a varied motive power;
- a gear transmission to composite motive power from the driver and motive power from the hydrostatic continuously variable transmission device, vary the composite motive power, and output the varied composite motive power;
- an electromagnetic valve to control a swash plate of the hydrostatic continuously variable transmission device;
- a control signal generator to control the electromagnetic valve through feedback control involving an environmental coefficient;
- a coefficient determiner to determine the environmental coefficient during a learning period from a start of the driver to an end of a predetermined time;
- and
- an operation limiter to limit respective operations of the at least one electromagnetic valve and the gear transmission during the learning period;
- wherein
- the work vehicle is operable to travel based on motive power supplied from the gear transmission.
Dependencies are inferred from the claim text.