Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1992-04-10
1993-11-09
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123520, F02M 3302
Patent
active
052593533
ABSTRACT:
A detecting system for condition of a fuel evaporative emission generated in a fuel tank, includes a pressure sensor and a three-way valve for selectively connecting the pressure sensor to atmosphere and the fuel tank. The pressure sensor is initially communicated with the atmosphere to detect an atmospheric pressure P.sub.a (step 110), and subsequently communicated with the fuel tank to detect an internal pressure P.sub.f of the fuel tank (step 130). Based on the atmospheric pressure P.sub.a and the internal pressure P.sub.f of the fuel tank, an amount EVP of the fuel evaporative emission generated in the fuel tank is derived through a map look-up against a preset map (step 150).
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Iida Hisashi
Nakai Kazuhiro
Nakashima Akihiro
Cross E. Rollins
Moulis Thomas
Nippondenso Co. Ltd.
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