Work vehicle

Patent metadata

Field	Value
Publication number	US-9726065-B2
Application number	US-201314235142-A
Country	US
Kind code	B2
Filing date	Sep 25, 2013
Priority date	Sep 25, 2013
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A work vehicle includes a vehicle body, a guiding pipe, a first heating section, and a second heating section. The vehicle body has a partition wall that partitions a space in an inner section into a first region and a second region. The guiding pipe is configured to guide a reducing agent. The guiding 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.

First claim

The invention claimed is:

1. A work vehicle comprising:
an engine;
a vehicle body having a partition wall configured to partition a space in an inner section into a first region and a second region having different temperature environments from each other, the first region being an engine room in which the engine is arranged, the second region being a space outside the engine room;
a reducing agent injection apparatus arranged in the first region and configured to inject a reducing agent into an exhaust treatment apparatus;
a reducing agent pump arranged in the second region and configured to pump the reducing agent to the reducing agent injection apparatus;
a guiding pipe configured to guide the reducing agent from the reducing agent pump to the reducing agent injection apparatus, the guiding pipe having a first pipe section positioned inside the first region and a second pipe section positioned inside the second region, the first pipe section extending from the reducing agent injection apparatus toward the partition wall and the second pipe section extending from the reducing agent pump toward the partition wall;
a first heating section provided on the first pipe section and configured to heat the first pipe section;
a second heating section provided on the second pipe section and configured to heat the second pipe section; and
a controller that controls the first heating section and the second heating section such that a temperature of the first heating section and a temperature of the second heating section are adjusted independently from each other.

2. The work vehicle according to claim 1 , further comprising:
a first temperature sensor arranged inside the first region; and
a second temperature sensor arranged inside the second region,
the controller being configured to control the first heating section based on a detection signal from the first temperature sensor and to control the second heating section based on a detection signal from the second temperature sensor.

3. The work vehicle according to claim 2 , wherein
a connecting section of the first pipe section and the second pipe section is positioned inside the first region.

4. The work vehicle according to claim 2 , wherein
a connecting section of the first pipe section and the second pipe section is positioned inside the second region.

5. The work vehicle according to claim 2 , wherein
a connecting section of the first pipe section and the second pipe section being provided in the partition wall.

6. The work vehicle according to claim 1 , further comprising:
a first temperature sensor arranged inside the first region,
the controller being configured to control the first heating section based on a detection signal from the first temperature sensor and to control the second heating section based on a temperature calculated based on the detection signal from the first temperature sensor.

7. The work vehicle according to claim 6 , wherein
a connecting section of the first pipe section and the second pipe section is positioned inside the first region.

8. The work vehicle according to claim 6 , wherein
a connecting section of the first pipe section and the second pipe section is positioned inside the second region.

9. The work vehicle according to claim 3 , wherein
a connecting section of the first pipe section and the second pipe section being provided in the partition wall.

10. The work vehicle according to claim 1 , further comprising:
a second temperature sensor arranged inside the second region,
the controller being configured to control the second heating section based on a detection signal from the second temperature sensor and to control the first heating section based on a temperature calculated based on the detection signal from the second temperature sensor.

11. The work vehicle according to claim 10 , further wherein
a connecting section of the first pipe section and the second pipe section being positioned inside the first region.

12. The work vehicle according to claim 10 , wherein
a connecting section of the first pipe section and the second pipe section is positioned inside the second region.

13. The work vehicle according to claim 10 , wherein
a connecting section of the first pipe section and the second pipe section being provided in the partition wall.

14. The work vehicle according to claim 1 , wherein
a connecting section of the first pipe section and the second pipe section is positioned inside the first region.

15. The work vehicle according to claim 1 , wherein
a connecting section of the first pipe section and the second pipe section is positioned inside the second region.

16. The work vehicle according to claim 1 , wherein
a connecting section of the first pipe section and the second pipe section being provided in the partition wall.

17. The work vehicle according to claim 1 , wherein
the first heating section includes a first heating wire wound onto the first pipe section, and
the second heating section includes a second heating wire wound onto the second pipe section.

18. A work vehicle comprising:
a vehicle body having a partition wall configured to partition a space in an inner section into a first region and a second region having different temperature environments from each other, the first region being an engine room, the second region being a space outside the engine room;
a guiding pipe configured to guide a reducing agent, the guiding pipe having a first pipe section positioned inside the first region and a second pipe section positioned inside the second region;
a first heating section provided on the first pipe section and configured to heat the first pipe section;
a second heating section provided on the second pipe section and configured to heat the second pipe section;
a connecting section connected between the first pipe section and the second pipe section, the first and second heating sections being separated from each other with the connecting section in-between;
an engine arranged in the first region;
an exhaust treatment apparatus arranged in the first region and configured to clean exhaust from the engine using a reducing agent;
a connecting pipe connected to the exhaust treatment apparatus, the connecting pipe being configured to conduct exhaust from the engine to the exhaust treatment apparatus;
a reducing agent injection apparatus arranged in the first region and configured to inject the reducing agent inside the connecting pipe; and
a reducing agent pump arranged in the second region and configured to discharge the reducing agent,
the guiding pipe being configured to guide the reducing agent from the reducing agent pump to the reducing agent injection apparatus,
the first pipe section of the guiding pipe extending from the reducing agent injection apparatus toward the partition wall and the second pipe section of the guiding pipe extending from the reducing agent pump toward the partition wall.

19. The work vehicle according to claim 18 , further comprising:
an air cleaner configured to clean air supplied to the engine,
the second region being a space with the air cleaner arranged therein, and the second region being linked with a space outside the vehicle body.

20. The work vehicle according to claim 18 , further comprising:
a radiator configured to cool a coolant in the engine,
the second region being a space with the radiator arranged therein, and the second region being linked with a space outside the vehicle body.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Kouno Kiichirou
• Itou Ken
• Yogita Jin
• Okuda Kozo
• Onodera Yasuyuki
• Oguri Hideo
• Nagasaka Shouhei
• Tomuro Minato

Classifications

• Y02A50/20

  Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters · CPC title

• F01N2610/148

  Arrangement of sensors · CPC title

• F01N2900/1811

  Temperature · CPC title

• F01N2610/105

  Control thereof · CPC title

• F01N2610/14

  Arrangements for the supply of substances, e.g. conduits · CPC title