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:
Aug. 17, 1993
Filed:
Jun. 16, 1992
Hiroshi Osaki, Ibaraki, JP;
Kyosan Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A fuel evaporative emission control system prevents fuel evaporative emission from discharging the atmosphere from the port of a filler cap in a fuel tank when the filler cap is opened during supply of fuel in the fuel tank and prevents the fuel evaporative emission from entering into a canister. The control system comprises a fuel evaporative emission backflow valve disposed between the canister and the fuel tank, the fuel evaporative emission backflow valve being closable to communicate with the canister and the fuel tank, the fuel evaporative emission backflow valve coupled to an intake manifold and having a valve which permits communication from the fuel tank to the canister, a solenoid valve disposed between the intake manifold and the fuel evaporative emission backflow valve, the solenoid valve including a first point communicating with the fuel evaporative emission backflow valve, a second port communicating with the intake manifold and a third port communicating with the atmosphere. A CPU coupled to the filler cap of the fuel tank detects the opening of the filler cap to thereby issue instruction signals to selectively control the opening and closing of the first to third ports of the solenoid valve.