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. 20, 1994
Filed:
Jun. 07, 1993
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An apparatus for monitoring air leakage into a fuel supply system for an internal combustion engine is provided. This system comprises a pressure sensor for detecting a pressure level in a fuel supply passage of the fuel supply system which communicates between a fuel tank and an intake passage of the engine and providing a signal indicative thereof, an air leakage control valve for leaking ambient air into the fuel supply passage at a preselected rate, and an air leakage monitoring unit for detecting a first pressure in the fuel supply system when the air leakage control valve is closed to restrict the leakage of the ambient air and a second pressure when the air leakage control valve is open to leak the ambient air into the fuel supply passage, the air leakage monitoring unit providing an alarm signal indicating that there is a preselected amount of air leakage in the fuel supply system based on a difference between the first and second pressures.