Hydraulic traveling vehicle and control method for hydraulic traveling vehicle
First Claim
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1. A hydraulic traveling vehicle comprising:
- a right-travel motor arranged in a first hydraulic circuit to be driven by pressurized oil;
a left-travel motor arranged in a second hydraulic circuit to be driven by pressurized oil;
a working equipment arranged in one of the first hydraulic circuit and the second hydraulic circuit to be driven by pressurized oil;
a hydraulic pump having a first hydraulic oil supply unit configured and arranged to supply the pressurized oil to the first hydraulic circuit and a second hydraulic oil supply unit configured and arranged to supply the pressurized oil to the second hydraulic circuit;
a merging/diverging valve configured and arranged to switch between a merging state to merge the first hydraulic circuit and the second hydraulic circuit and a diverging state to separate the first hydraulic circuit and the second hydraulic circuit; and
a control unit configured to control the merging/diverging valve when the working equipment is driven, the merging/diverging valve is in the diverging state, and the hydraulic traveling vehicle is traveling in a turning condition, such thatthe merging/diverging valve is switched to the merging state when a required flow rate parameter corresponding to a required flow rate for the pressurized oil of the working equipment is greater than or equal to a prescribed threshold value, andthe merging/diverging valve is maintained in the diverging state when the required flow rate parameter is lower than the prescribed threshold value.
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Abstract
With a hydraulic traveling vehicle, a controller is configured and arranged to switch a merging/diverging valve to a merging state when a working equipment is driven with the merging/diverging valve being in a diverging state and with turning of the hydraulic traveling vehicle being carried out, and when a required flow rate parameter for pressurized oil of the working equipment is greater than or equal to a prescribed threshold value, and to maintain the merging/diverging valve in the diverging state when the required flow rate parameter is less than the prescribed threshold value.
9 Citations
5 Claims
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1. A hydraulic traveling vehicle comprising:
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a right-travel motor arranged in a first hydraulic circuit to be driven by pressurized oil; a left-travel motor arranged in a second hydraulic circuit to be driven by pressurized oil; a working equipment arranged in one of the first hydraulic circuit and the second hydraulic circuit to be driven by pressurized oil; a hydraulic pump having a first hydraulic oil supply unit configured and arranged to supply the pressurized oil to the first hydraulic circuit and a second hydraulic oil supply unit configured and arranged to supply the pressurized oil to the second hydraulic circuit; a merging/diverging valve configured and arranged to switch between a merging state to merge the first hydraulic circuit and the second hydraulic circuit and a diverging state to separate the first hydraulic circuit and the second hydraulic circuit; and a control unit configured to control the merging/diverging valve when the working equipment is driven, the merging/diverging valve is in the diverging state, and the hydraulic traveling vehicle is traveling in a turning condition, such that the merging/diverging valve is switched to the merging state when a required flow rate parameter corresponding to a required flow rate for the pressurized oil of the working equipment is greater than or equal to a prescribed threshold value, and the merging/diverging valve is maintained in the diverging state when the required flow rate parameter is lower than the prescribed threshold value. - View Dependent Claims (2, 3, 4)
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5. A hydraulic traveling vehicle comprising:
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a right-travel motor arranged in a first hydraulic circuit to be driven by pressurized oil; a left-travel motor arranged in a second hydraulic circuit to be driven by pressurized oil; a working equipment arranged in one of the first hydraulic circuit and the second hydraulic circuit to be driven by pressurized oil; a hydraulic pump having a first hydraulic oil supply unit configured and arranged to supply the pressurized oil to the first hydraulic circuit and a second hydraulic oil supply unit configured and arranged to supply the pressurized oil to the second hydraulic circuit; a merging/diverging valve configured and arranged to switch between a merging state to merge the first hydraulic circuit and the second hydraulic circuit and a diverging state to separate the first hydraulic circuit and the second hydraulic circuit; and a control unit configured to control the merging/diverging valve when the working equipment is stopped from a state where the hydraulic traveling vehicle is in a turning condition, the working equipment is being driven, and the merging/diverging valve is in the merging state, such that the merging/diverging valve is maintained in the merging state while the hydraulic traveling vehicle is maintained in the turning condition, and the merging/diverging valve is switched to the diverging state when the hydraulic traveling vehicle is switched from the turning condition to a straight line traveling condition.
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Specification