Method of controlling a vapor storage canister for a purge control system
First Claim
1. A method of controlling a vapor storage canister for a purge control system of an internal combustion engine, said method comprising the steps of:
- determining whether predetermined conditions are right for controlling a vapor storage canister;
maintaining normal fuel feedback operation if the predetermined conditions are not right for controlling the vapor storage canister;
determining if the vapor storage canister is loaded if predetermined conditions are right for controlling the vapor storage canister;
maintaining normal fuel feedback operation if the vapor storage canister is loaded;
modifying a duty cycle of a purge solenoid to maximize purge if the vapor storage canister is loaded;
updating a loaded canister total purge multiplier; and
using the total purge multiplier to vary the amount of fuel being delivered to the internal combustion engine.
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Accused Products
Abstract
A method of controlling a vapor storage canister for a purge control system of an internal combustion engine is provided. The method includes the steps of determining if predetermined conditions are right for controlling a vapor storage canister and maintaining normal fuel feedback operation if the predetermined conditions are not right for controlling the vapor storage canister. The method also includes the steps of determining if the vapor storage canister is loaded if the predetermined conditions are right for controlling the vapor storage canister, maintaining normal fuel feedback operation if the vapor storage canister is not loaded and modifying a duty cycle of a purge solenoid to maximize purge if the vapor storage canister is loaded. The method further includes the steps of updating a loaded canister total purge multiplier and using the total purge multiplier to vary the amount of fuel being delivered to the internal combustion engine.
38 Citations
16 Claims
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1. A method of controlling a vapor storage canister for a purge control system of an internal combustion engine, said method comprising the steps of:
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determining whether predetermined conditions are right for controlling a vapor storage canister; maintaining normal fuel feedback operation if the predetermined conditions are not right for controlling the vapor storage canister; determining if the vapor storage canister is loaded if predetermined conditions are right for controlling the vapor storage canister; maintaining normal fuel feedback operation if the vapor storage canister is loaded; modifying a duty cycle of a purge solenoid to maximize purge if the vapor storage canister is loaded; updating a loaded canister total purge multiplier; and using the total purge multiplier to vary the amount of fuel being delivered to the internal combustion engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of controlling a vapor storage canister for a purge control system of an internal combustion engine, said method comprising the steps of:
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determining whether predetermined conditions are right for controlling a potentially loaded vapor storage canister; maintaining normal fuel feedback operation if predetermined conditions are not right for controlling the vapor storage canister; determining if the vapor storage canister is loaded by activating the purge solenoid if predetermined conditions are right for controlling the vapor storage canister; comparing whether an instantaneous oxygen (O2) controller signal minus an average O2 controller signal before the purge solenoid is turned on is greater than a predetermined fuel shift value; maintaining normal fuel feedback operation if the instantaneous O2 controller signal minus the average O2 controller signal is not greater than the fuel shift value indicating the vapor storage canister is not loaded; ramping the purge solenoid duty cycle up to maximize purge if the vapor storage canister is loaded; incrementing or decrementing a total purge multiplier; and using said total purge multiplier to vary the amount of fuel being delivered to the engine.
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Specification