Cold start fuel vapor enrichment

Details Cold start fuel vapor enrichment Cold start fuel vapor enrichment

2005-03-22

2005-03-22

Huynh, Hai (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S525000, C123S698000, C123S575000, C123S491000

Reexamination Certificate

active

06868837

ABSTRACT:
An engine system includes an engine, a fuel system that communicates with the engine, and a controller that communicates with the fuel system. The controller controls a first quantity of liquid fuel to the engine at a first A/F ratio and a second quantity of vapor fuel to the engine at a second A/F ratio during a predetermined period after start-up. The liquid and vapor fuel mixture has a third A/F ratio. The controller determines an available A/F ratio of vapor fuel within the fuel tank and performs a comparison with a target A/F ratio range. The second quantity is set to zero if the A/F ratio of the vapor fuel is outside of the target A/F ratio range. The controller adjusts the first and second quantities based on a comparison between an exhaust A/F ratio and a target exhaust A/F ratio.

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