Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/186968
Kind Code:
A1
Abstract:
Provided is a work machine comprising: an SCR catalyst 33 provided in an exhaust pipe of an engine 100; an injection nozzle 32 of an injector 54 that is arranged on the upstream side of the SCR catalyst and injects urea-water; a urea-water tank 50 that stores urea-water; a urea-water pump 52 that supplies urea-water to the injector 54 from the urea-water tank; and a control device 90 that controls the operation of the urea-water tank, wherein when a temperature Tu of urea-water is a temperature equal to or lower than a predetermined freezing temperature Tf and an environmental temperature Tout is a temperature equal to or lower than a temperature Tu of urea-water, the control device 90 determines that urea-water in the urea-water tank 50 has a quality abnormality when the urea-water pump 52 normally works and outputs a determination result. It is thereby possible to accurately diagnose urea-water quality in the urea-water tank.
Inventors:
BAO HE (JP)
Application Number:
PCT/JP2018/013458
Publication Date:
October 03, 2019
Filing Date:
March 29, 2018
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F01N3/18; F01N3/08
Foreign References:
| JP2010180801A | 2010-08-19 | |||
| JP2014173469A | 2014-09-22 | |||
| JP2013147982A | 2013-08-01 |
Attorney, Agent or Firm:
KAICHI IP (JP)
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