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:
Oct. 20, 2015
Filed:
Jan. 31, 2013
Denso Corporation, Kariya, Aichi-pref., JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A first purge passage is connected to an intake-air passage at a downstream side of a throttle valve. A second purge passage is connected to the intake-air passage at an upstream side of a supercharging device. A first and a second check valve are respectively provided in the first and second purge passages. A control unit determines to which operating condition (from a first to a third operating condition) engine operation corresponds, based on downstream-side and upstream-side pressure of the throttle valve. A change of in-tank pressure of a fuel tank is detected in a condition that an air-communication valve is closed but a purge control valve is opened. The control unit diagnoses which of the valves is not normally operated and whether such valve is fixed to a valve opened or a valve closed position, based on the change of in-tank pressure for each of engine operating conditions.