Work vehicle and control method for work vehicle

A work vehicle, comprising:

• an engine;
• a hydraulic pump driven by the engine;
• a traveling motion hydraulic motor driven by hydraulic fluid discharged from the hydraulic pump;
• a pump displacement control cylinder configured to change a pump displacement of the hydraulic pump by changing a tilting angle of the hydraulic pump;
• a pilot hydraulic pressure source configured to supply hydraulic fluid for driving the pump displacement control cylinder;
• a pilot pressure control valve configured to control a pilot pressure, which is a pressure of the hydraulic fluid supplied to the pump displacement control cylinder from the pilot hydraulic pressure source;
• an inching operation member configured to be operated in order to indicate execution of inching control to bring about a reduction in the pump displacement by reducing the pilot pressure;
• an inching operation quantity detector configured to detect an inching operation quantity which is an operation quantity of the inching operation member;
• a determination parameter detector configured to detect a determination parameter for determining whether the vehicle is in a state of work or a state of traveling motion;
• a storage section configured to store inching characteristic information defining a relationship between the inching operation quantity, and an inching characteristic value corresponding to the pilot pressure which is reduced through the inching control;
• and
• a computing section configured to reference the inching characteristic information to thereby compute, from the inching operation quantity detected by the inching operation quantity detector, a command value to the pilot pressure control valve, wherein
• the inching characteristic information defines a relationship between the inching operation quantity and the inching characteristic value, in a manner dependent on the determination parameter, and
• in the inching characteristic information, a rate of lowering the inching characteristic value when the inching operation quantity is within a first range is greater than a rate of lowering the inching characteristic value when the inching operation quantity is within a second range greater than the first range.