Patent ID: 6205982
Filing Date: 2001-03-27
Classification: F02D

Abstract:
A method for controlling fuel vapor purge flow in an automotive type internal combustion engine, said method comprising the steps of:determining existence of a purge ON condition;determining a desired purge flow;determining a desired purge solenoid current corresponding to said desired purge flow by looking up said desired purge solenoid current in a three dimensional table;utilizing a PID control methodology to produce said desired purge solenoid current;generating a purge driver PWM signal of said desired purge solenoid current; andcontrolling a purge solenoid with said purge driver PWM signal to control purge flowwherein said step of determining said desired purge solenoid current corresponding to said desired purge flow by looking up said desired purge solenoid current in said three dimensional table includes using a two dimensional table to define break points for said three dimensional table containing purge solenoid currents.