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US 8,706,364 B2Granted
Wheel loader and method for controlling wheel loader
AssigneeKomatsu Ltd.
InventorAtsushi Shirao
Life of this patent
Estimating the term…
Abstract
A traction force control section of a wheel loader, when the determination conditions are satisfied during traction force control, increases the maximum traction force. The determination conditions include that the aspect of operation is excavation, that the vehicle speed is less than or equal to a prescribed speed threshold value, that the amount of operation of the accelerator operating member is equal to or more than a prescribed accelerator threshold value, and that the amount of operation of the inching operating member is less than or equal to a prescribed inching operation threshold value.
Claims17
A wheel loader comprising:
- a work implement including a boom and a bucket;
- an engine;
- a hydraulic pump configured to be driven by the engine;
- a hydraulic motor for travel configured to be driven by a hydraulic fluid ejected from the hydraulic pump;
- an accelerator operating member configured to be operated to set a target rotational speed of the engine;
- an inching operating member configured to be operated to reduce a vehicle speed;
- a traction force control operating member configured to be operated to switch ON or OFF of a traction force control for reducing a maximum traction force;
- a vehicle speed detecting section configured to detect the vehicle speed;
- an aspect of operation determining section configured to determine whether or not an aspect of operation is excavation;
- a vehicle speed determining section configured to determine whether or not the vehicle speed is less than or equal to a prescribed speed threshold value;
- an accelerator operation determining section configured to determine whether or not an amount of operation of the accelerator operating member is equal to or more than a prescribed accelerator threshold value;
- an inching operation determining section configured to determine whether or not an amount of operation of the inching operating member is less than or equal to a prescribed inching operation threshold value;
- and
- a traction force control section configured to reduce the maximum traction force when the traction force control is in an ON state compared to the maximum traction force when the traction force control is in an OFF state;
- wherein, the traction force control section is configured to increase the maximum traction force when determination conditions are satisfied during the traction force control, the determination conditions including conditions that the aspect of operation is excavation, the vehicle speed is less than or equal to the prescribed speed threshold value, the amount of operation of the accelerator operating member is equal to or more than the prescribed accelerator threshold value, and the amount of operation of the inching operating member is less than or equal to the prescribed inching operation threshold value.
12 more elements
A method for controlling a wheel loader including
- a work implement including a boom and a bucket,
- an engine,
- a hydraulic pump configured to be driven by the engine,
- a hydraulic motor for travel configured to be driven by a hydraulic fluid ejected from the hydraulic pump,
- an accelerator operating member configured to be operated to set a target rotational speed of the engine,
- an inching operating member configured to be operated to reduce a vehicle speed,
- a traction force control operating member configured to be operated to switch ON or OFF of a traction force control for reducing a maximum traction force,
- the method comprising:
- detecting the vehicle speeds;
- determining whether or not an aspect of operation is excavation;
- determining whether or not the vehicle speed is less than or equal to a prescribed speed threshold value;
- determining whether or not an amount of operation of the accelerator operating member is equal to or more than a prescribed accelerator threshold value;
- determining whether or not an amount of operation of the inching operating member is less than or equal to a prescribed inching operation threshold value;
- when the traction force control is in an ON state, reducing the maximum traction force compared to the maximum traction force when the traction force control is in an OFF state;
- and
- increasing the maximum traction force when determination conditions are satisfied during the traction force control wherein, the determination conditions include conditions that the aspect of operation is excavation, the vehicle speed is less than or equal to the prescribed speed threshold value, the amount of operation of the accelerator operating member is equal to or more than the prescribed accelerator threshold value, and the amount of operation of the inching operating member is less than or equal to the prescribed inching operation threshold value.
13 more elements
Dependencies are inferred from the claim text.