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US 11,536,006 B2Granted
Work vehicle and control method for work vehicle
AssigneeKomatsu Ltd.
InventorsKei Nakano, Hiroki Yamamoto, Kazuki Kure, Souichi Tsumura
Life of this patent
Estimating the term…
Abstract
A controller controls the steering device so as to cause a vehicle body to turn toward the left when a left steering lever is operated without a right steering lever being operated. The controller controls the steering device so as to cause the vehicle body to turn toward the right when the right steering lever is operated without the left steering lever being operated. The controller reduces the rotation speed of the engine when both the left steering lever and the right steering lever are operated and both the operation amount of the left steering lever and the operation amount of the right steering lever are equal to or greater than a first threshold.
Claims10
A work vehicle comprising:
- a vehicle body;
- an engine disposed in the vehicle body;
- a left travel device attached to the vehicle body, and the left travel device being driven with driving power from the engine;
- a right travel device attached to the vehicle body, and the right travel device being driven with driving power from the engine;
- a steering device configured to cause the vehicle body to turn, the steering device including
- a left brake device connected to the left travel device, and the left brake device brakes the left travel device, and
- a right brake device connected to the right travel device, and the right brake device brakes the right travel device;
- a left steering lever arranged to be operable by an operator, and the left steering lever outputting a signal in response to an operation of the left steering lever;
- a right steering lever arranged to be operable by an operator, and the right steering lever outputting a signal in response to an operation of the right steering lever;
- and
- a controller that receives a signal indicating the operation of the left steering lever and a signal indicating the operation of the right steering lever,
- the controller being configured to
- control the steering device so as to cause the vehicle body to turn leftward by controlling the left brake device to brake the left travel device when the left steering lever is operated without the right steering lever being operated,
- control the steering device so as to cause the vehicle body to turn toward the right by controlling the right brake device and braking the right travel device when the right steering lever is operated without the left steering lever being operated, and
- when both the left steering lever and the right steering lever are operated and both an operation amount of the left steering lever and an operation amount of the right steering lever are equal to or greater than a first threshold,
- reduce a rotation speed of the engine, and
- control both the left brake device and the right brake device to brake both the left travel device and the right travel device after reduction of the rotation speed of the engine or along with the reduction of the rotation speed of the engine.
14 more elements
A method executed with a controller in order to control a work vehicle including
- an engine,
- a left travel device configured to cause the work vehicle to travel,
- a right travel device configured to cause the work vehicle to travel,
- a left brake device that is connected to the left travel device and brakes the left travel device, and
- a right brake device that is connected to the right travel device and brakes the right travel device,
- the method comprising:
- receiving a signal indicating an operation of a left steering lever,
- receiving a signal indicating an operation of a right steering lever,
- outputting a command signal to cause the work vehicle to turn leftward when the left steering lever is operated without the right steering lever being operated, the command signal causing the work vehicle to turn leftward by controlling the left brake device to brake the left travel device;
- outputting a command signal to cause the work vehicle to turn rightward when the right steering lever is operated without the left steering lever being operated, the command signal causing the work vehicle to turn rightward by controlling the right brake device to brake the right travel device;
- and
- when the left steering lever and the right steering lever are both operated and an operation amount of the left steering lever and an operation amount of the right steering lever are both equal to or greater than a first threshold,
- outputting a command signal to reduce a rotation speed of the engine and
- outputting a command signal to control both the left brake device and the right brake device to brake both the left travel device and the right travel device after reduction of the rotation speed of the engine or along with the reduction of the rotation speed of the engine.
11 more elements
Dependencies are inferred from the claim text.