Work vehicle and method of controlling work vehicle

摘要

A work vehicle includes an engine, an exhaust gas purification apparatus, a reducing agent tank, an engine coolant circuit, a branch path, a valve, an accepting portion, a valve control unit, a fan, a radiator, a thermostat, and a fan control unit. The valve control unit gives an instruction for an opening operation of the valve in response to the operation instruction from the operator accepted by the accepting portion. The fan generates cooling wind in an engine room. The radiator cools the engine coolant with the cooling wind. The thermostat is provided between the circulation path and the radiator and operates to open for supplying the engine coolant to the radiator when a temperature of the engine coolant is equal to or higher than a prescribed temperature. The fan control unit increases the number of rotations of the fan in response to the operation instruction.

主权项

1. A work vehicle, comprising:
an engine; an exhaust gas purification apparatus for purifying a nitrogen oxide in an exhaust gas emitted from said engine; a reducing agent tank for storing a reducing agent to be supplied to said exhaust gas purification apparatus; an engine coolant circuit including a water pump for circulating an engine coolant for cooling of said engine through a circulation path as said engine is driven; a branch path brandied from said circulation path and provided for heat exchange between said engine coolant and said reducing agent in said reducing agent tank; a valve for controlling supply of said engine coolant into said branch path; an accepting portion configured to accept an air release mode instruction instructed by an operator that releases air in the branch path by opening the valve and releasing the air to an air release path; a main controller including a valve control unit programmed to give an instruction for an opening operation of said valve in response to said air release mode instruction from said operator accepted by said accepting portion; a fan for generating cooling wind in an engine room; a radiator for cooling said engine coolant with said cooling wind; a thermostat provided between said circulation path and said radiator and operating to open for supplying said engine coolant to said radiator when a temperature of said engine coolant is equal to or higher than a prescribed temperature; and the main controller further including a fan control unit programmed to increase the number of rotations of said fan in response to said air release mode instruction from said operator accepted by said accepting portion to thereby prevent the thermostat from operating to open and to release air in the branch path.