Purge flow control to reduce air/fuel ratio imbalance

Details Purge flow control to reduce air/fuel ratio imbalance Purge flow control to reduce air/fuel ratio imbalance

2008-07-22

2008-07-22

Moulis, Thomas N (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

Reexamination Certificate

active

07401600

ABSTRACT:
A fuel control system that regulates a purge flow from a fueling system to an engine includes a sensor that monitors an engine speed and a first module that determines a PWM frequency of a purge valve based on the engine speed. The PWM frequency includes a first period that is based on a second period that corresponds to two engine cycles. A second module regulates the purge valve based on the PWM frequency during engine operation.

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