Purge flow control to reduce air/fuel ratio imbalance
AssigneeGM Global Technology Operations LLC
InventorsGregory E. Labus, Jerry W. Kortge, William R. Cadman
Life of this patent
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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.
Claims22
A fuel control system that regulates a purge flow from a fueling system to an engine, comprising:
- a sensor that monitors an engine speed;
- a first module that determines a PWM frequency of a purge valve based on said engine speed, wherein said PWM frequency includes a first period that is based on a second period that corresponds to two engine cycles;
- and
- a second module that regulate said purge valve based on said PWM frequency during engine operation.
A method of regulating a purge flow valve of a fuel system that provides fuel to an engine, comprising:
- monitoring an engine speed;
- determining a PWM frequency of said purge valve based on said engine speed, wherein said PWM frequency includes a first period that is based on a second period that corresponds to two engine cycles;
- and
- regulating said purge valve based on said PWM frequency during engine operation.
A method of regulating operation of an internal combustion engine, comprising:
- monitoring an engine speed;
- determining a PWM frequency for a purge valve of a fuel system based on said engine speed, wherein said PWM frequency includes a first period that is based on a second period that corresponds to two engine cycles;
- fueling a cylinder of said engine;
- and
- regulating said purge valve based on said PWM frequency during engine operation to periodically provide additional fuel to said cylinder.
Dependencies are inferred from the claim text.