Work vehicle

Abstract

A work vehicle is provided with a vehicle body, a pipe, a first heating section, and a second heating section. The vehicle body has a first region and a second region which is partitioned from the first region. The pipe has a first pipe section and a second pipe section. The first pipe section is positioned inside the first region. The second pipe section is positioned in the second region. The first heating section heats the first pipe section. The second heating section heats the second pipe section and adjusts the temperature independently from the first heating section.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a U.S. National stage application of International Application No. PCT / JP2013 / 075837, filed on Sep. 25, 2013.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates to a work vehicle.[0004]2. Background Information[0005]An exhaust treatment apparatus for treat exhaust from an engine is mounted in a work vehicle. The exhaust treatment apparatus reduces nitrogen oxide (NOx) in the exhaust using a reducing agent which is supplied via a guiding pipe.[0006]The reducing agent freezes at low temperatures. As a result, a heat insulating apparatus for insulating the reducing agent is proposed in Japan Patent Laid-open Patent Publication JP-A-2000-27627. The heat insulating apparatus has a heating wire which is arranged to span along the entire outer surface of a supply pipe for the reducing agent. Here, the power supply to the heating wire is controlled to be on or off according to the temperature of the re...

AI Technical Summary

Benefits of technology

The present invention aims to provide a work vehicle that can appropriately adjust the temperature of a reducing agent in different environmental temperatures. The work vehicle has a connecting section between two pipe sections, which can be positioned inside the engine room or outside the engine room, to prevent freezing or excessive temperature rise of the reducing agent. Additionally, the reducing agent pump can be positioned inside the lower temperature region to prevent excessive temperature rise and adjust the temperature of the reducing agent between the reducing agent pump and the reducing agent injection apparatus. Therefore, the invention allows for the appropriate adjustment of the reducing agent temperature in various situations.

Problems solved by technology

In the above situation, when the temperature of the entire guiding pipe is adjusted to be uniform, it is difficult to appropriately adjust the temperature of the reducing agent.

For example, when the power supply to the heating wire is turned on and off based on the temperature inside the second region which is a lower temperature, the temperature of the reducing agent inside the first region which is a higher temperature is excessively increased and there is a possibility that degradation of the reducing agent will proceed.

Alternatively, when the power supply to the heating wire is turned on and off based on the temperature inside the first region which is a higher temperature, the temperature of the reducing agent inside the second region which is a lower temperature is excessively decreased and there is a possibility that the reducing agent will freeze.

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