The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2012
Filed:
Aug. 06, 2008
Shohei Kamiya, Kasumigaura, JP;
Kazunori Nakamura, Tsuchiura, JP;
Shohei Kamiya, Kasumigaura, JP;
Kazunori Nakamura, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
Before a large amount of PM is deposited in a filter, an exhaust gas cleaning system for a construction machine regenerates the filter. In a non-operational state with the engineof the construction machine left running for a certain time, a controllermonitors the non-operational state. After this state continues for a predetermined time Ta, when the pressure sensed by a differential pressure sensoris higher than a second predetermined pressure level P, the controllercontrols the rotating speed of the engineto a predetermined speed Na before starting forced regeneration to burn off the PM deposited in a filter. When the pressure sensed by the differential pressure sensordecreases below a first predetermined pressure level P, the controllerterminates the regeneration automatically and returns the engine to normal control mode.