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:
Sep. 17, 2013
Filed:
Mar. 01, 2011
Kentaro Itoga, Tsuchiura, JP;
Yasushi Arai, Tsuchiura, JP;
Kentaro Itoga, Tsuchiura, JP;
Yasushi Arai, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
An exhaust gas treatment apparatus for a working machine is provided to reliably prevent a specific process that raises the exhaust temperature of an exhaust gas treatment section from being carried out during switching operation of a directional control valve. The apparatus includes: a directional control valve that controls the flow of pressure oil supplied to an actuator; a pilot pump that supplies pressure oil to an operating device operated to switch the directional control valve; an open/close valve arranged downstream of the directional control valve; a control valve that controls the open/close valve; a lock valve arranged between the pilot pump and the operating device; a detecting section that detects when a specific process that raises the exhaust temperature of an exhaust gas treatment section becomes necessary, and outputs the corresponding detection signal; a controller that controls the control valve; and a pipe for performing a process of setting the open/close valve to an open position in accordance with the pilot pressure oil supplied from the pilot pump.