System for controlling evaporative emissions

Details System for controlling evaporative emissions System for controlling evaporative emissions

2007-01-30

2008-10-07

Kwon, John T (Department: 3747)

Internal-combustion engines

Charge forming device

C123S673000, C123S678000

Reexamination Certificate

active

07431016

ABSTRACT:
A control system for controlling a valve in a fuel system of engine including an engine airflow sensor that senses a mass engine airflow (Mengair), a barometric pressure sensor that senses a barometric pressure (Pbaro), and an ambient temperature sensor that senses an ambient temperature (Tamb). An actuator determination module determines an effective area (Aeff) of the valve based on at least one of the Mengair, the Pbaro, and the Tamb. A duty cycle (DC) calculation module that determines a first duty cycle (DC) of the valve based on the Aeff.

REFERENCES:
patent: 6640539 (2003-11-01), Lewis et al.
patent: 6666021 (2003-12-01), Lewis et al.
patent: 6715280 (2004-04-01), Lewis et al.
patent: 7185487 (2007-03-01), Lewis et al.
patent: 7293406 (2007-11-01), Lewis et al.

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