Work vehicle and control method for work vehicle
AssigneeKomatsu Ltd.
InventorTakahisa Oasa
Life of this patent
Estimating the term…
Abstract
When the vehicle speed increases and reaches a predetermined switching threshold, the controller reduces the displacement of the first travel motor and controls the flow rate control device to offset a flow rate excess in the hydraulic circuit in accordance with the reduction in the displacement of the first travel motor. After the vehicle speed has reached the switching threshold, the controller executes switching control to switch the clutch from an engaged state to a disengaged state.
Claims8
A work vehicle comprising:
- an engine;
- a travel pump configured to be driven by the engine;
- a hydraulic circuit connected to the travel pump;
- a first travel motor connected to the travel pump via the hydraulic circuit;
- a second travel motor connected to the travel pump via the hydraulic circuit;
- a flow rate control device configured to control a flow rate of hydraulic fluid in the hydraulic circuit;
- a drive shaft connected to the first travel motor and the second travel motor;
- a clutch disposed between the first travel motor and the drive shaft;
- a sensor configured to output a signal indicative of a vehicle speed;
- and
- a controller configured to
- receive the signal from the sensor and
- control the first travel motor and the clutch,
- the controller being further configured to
- when the vehicle speed increases and reaches a predetermined switching threshold, reduce a displacement of the first travel motor and control the flow rate control device to offset a flow rate excess in the hydraulic circuit in accordance with reduction in the displacement of the first travel motor;
- and
- execute a switching control to switch the clutch from an engaged state to a disengaged state after the vehicle speed has reached a switching threshold.
A method executed by a controller to control a work vehicle, the work vehicle including an engine, a travel pump configured to be driven by the engine, a hydraulic circuit connected to the travel pump, a first travel motor connected to the travel pump via the hydraulic circuit, a second travel motor connected to the travel pump via the hydraulic circuit, a flow rate control device configured to control a flow rate of hydraulic fluid in the hydraulic circuit, a drive shaft connected to the first travel motor and the second travel motor, and a clutch disposed between the first travel motor and the drive shaft;
- the method comprising:
- receiving a signal indicative of a vehicle speed;
- reducing a displacement of the first travel motor and controlling the flow rate control device to offset a flow rate excess in the hydraulic circuit in accordance with reduction in the displacement of the first travel motor when the vehicle speed increases and reaches a predetermined switching threshold;
- and
- executing a switching control to switch the clutch from an engaged state to a disengaged state after the vehicle speed has reached the switching threshold.
Dependencies are inferred from the claim text.