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:
Feb. 04, 2020
Filed:
Jan. 08, 2018
Subaru Corporation, Tokyo, JP;
Daiki Shiwa, Tokyo, JP;
Daisuke Takahashi, Tokyo, JP;
SUBARU CORPORATION, Tokyo, JP;
Abstract
A leakage detection device for detecting leakage in a positive crankcase ventilation (PCV) passage having at least a scavenging line and a fresh air line includes: a first pressure measurement unit that measures a pressure in the PCV passage; a leakage detection valve that opens and closes the fresh air line; a PCV valve that adjusts a flow rate of blow-by gas; a second pressure measurement unit that measures a pressure in the intake passage; a first valve controller that controls the leakage detection valve when a leakage diagnostic condition is satisfied; a second valve control unit that reduces an opening degree of the PCV valve, and suppresses a flow rate in the PCV passage based on the pressure in the intake manifold after the leakage detection valve is closed; and a leakage determination unit that determines whether leakage occurs based on the pressure in the PCV passage.