System and method for controlling release of fuel vapor from a vapor recovery system
First Claim
1. A method of controlling fuel vapor release from a vapor recovery system into an intake manifold of an internal combustion engine, comprising the steps:
- determining a first purge flow ratio that is indicative of a desired amount of fuel vapor to be released from the vapor recovery system relative to an actual amount of fuel vapor released from the vapor recovery system;
determining at least one second purge flow ratio that is indicative of a maximum desired value of an operating parameter relative to an actual value of said operating parameter; and
adjusting the amount of fuel vapor released from the vapor recovery system based on said first purge flow ratio and said second purge flow ratio.
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Accused Products
Abstract
A system and method for adjusting fuel vapor delivery from a fuel vapor recovery system in an internal combustion engine. A requested amount of fuel vapor delivery is determined based upon a desired fuel vapor delivery amount and various system constraints, which ensure continued optimal operation of the vehicle. Purge fuel ratios are calculated by comparing desired levels to actual levels of various operating parameters. The purge fuel ratios are compared to each other to determine the minimum value from among the various purge fuel ratios, which is indicative of the most limiting system constraint. The most limiting system constraint is used to calculate an amount of fuel vapor to be delivered from the vapor recovery system.
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Citations
36 Claims
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1. A method of controlling fuel vapor release from a vapor recovery system into an intake manifold of an internal combustion engine, comprising the steps:
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determining a first purge flow ratio that is indicative of a desired amount of fuel vapor to be released from the vapor recovery system relative to an actual amount of fuel vapor released from the vapor recovery system;
determining at least one second purge flow ratio that is indicative of a maximum desired value of an operating parameter relative to an actual value of said operating parameter; and
adjusting the amount of fuel vapor released from the vapor recovery system based on said first purge flow ratio and said second purge flow ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A fuel vapor recovery system coupled to an internal combustion engine, comprising:
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a fuel vapor absorbent coupled between a fuel tank and the engine;
a purge valve coupled between said fuel vapor absorbent and the engine for controlling release of fuel vapor from said absorbent into the engine; and
a controller for determining a first purge flow ratio that is indicative of a desired amount of fuel vapor to be released from the vapor recovery system relative to an actual amount of fuel vapor released from the vapor recovery system;
determining at least one second purge flow ratio that is indicative of a maximum desired value of an operating parameter relative to an actual value of said operating parameter; and
adjusting an amount of fuel vapor released from the vapor recovery system based on said first purge flow ratio and said second purge flow ratio.- View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of controlling fuel vapor release from a vapor recovery system into an intake manifold of an internal combustion engine, comprising the steps:
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determining a first purge flow ratio that is indicative of a desired amount of fuel vapor to be released from the vapor recovery system relative to an actual amount of fuel vapor released from the vapor recovery system;
determining at least one second purge flow ratio that is indicative of a maximum desired value of an operating parameter relative to an actual value of said operating parameter;
determining a minimum purge flow ratio from among said first purge flow ratio and said second purge flow ratio;
decreasing a requested purge flow parameter, which is indicative of a target amount of fuel vapor to release from the vapor recovery system, when said minimum purge flow ratio is less than a reference value; and
increasing said requested purge flow parameter when said minimum purge flow ratio is greater than said reference value.
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36. A method for controlling an amount of fuel vapor released from a vapor recovery system to an intake manifold of an engine, the method comprising:
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determining a first vapor flow control value based on both a desired amount of fuel vapor to be released from said vapor recovery system and an actual amount of fuel vapor being released from the system;
determining a second vapor flow control value based on both a desired value of an engine operating parameter and an actual value of said engine operating parameter; and
,adjusting the amount of fuel vapor released from the vapor recovery system based on the first vapor flow control value and the second vapor flow control value.
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Specification