Vapor recovery control system for direct injection spark ignition engines
First Claim
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1. A vapor recovery control system for a spark ignited engine having an air intake with a throttle positioned therein, said engine having a first set of cylinders and a second set of cylinders, said system comprising:
- a vapor recovery system coupled to the engine for delivering purge vapor to the first set of cylinders;
a control valve positioned between said vapor recovery system and the first set of cylinders; and
a controller for actuating said control valve in response to a purge signal, operating said first set of cylinders in a homogeneous mode of operation with a homogeneous mixture of air and fuel in said first set of cylinders by injecting during an intake stroke, and operating said second set of cylinders in a stratified mode of operation with a stratified mixture of air and fuel in said second set of cylinders by injecting during a compression stroke.
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Abstract
A vapor recovery control system for a direct injection spark ignition engine is used to purge vapors in both a homogeneous air/fuel and stratified air/fuel mode. When purging vapors in a stratified mode, a portion of the cylinders receive purge vapors and operate in a homogeneous mode while the rest of the cylinders continue to operate in a stratified mode.
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Citations
19 Claims
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1. A vapor recovery control system for a spark ignited engine having an air intake with a throttle positioned therein, said engine having a first set of cylinders and a second set of cylinders, said system comprising:
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a vapor recovery system coupled to the engine for delivering purge vapor to the first set of cylinders; a control valve positioned between said vapor recovery system and the first set of cylinders; and a controller for actuating said control valve in response to a purge signal, operating said first set of cylinders in a homogeneous mode of operation with a homogeneous mixture of air and fuel in said first set of cylinders by injecting during an intake stroke, and operating said second set of cylinders in a stratified mode of operation with a stratified mixture of air and fuel in said second set of cylinders by injecting during a compression stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A vapor recovery control system for a spark ignited engine having an air intake with a throttle positioned therein, said engine having a first set of cylinders and a second set of cylinders, said system comprising:
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a vapor recovery system coupled to the engine for delivering purge vapor to the first set of cylinders; a control valve positioned between said vapor recovery system and the first set of cylinders; a first exhaust gas oxygen sensor coupled to the first set of cylinders; a second exhaust gas oxygen sensor coupled to the second set of cylinders; and a controller for actuating said control valve in response to a purge signal, operating said first set of cylinders in a homogeneous mode of operation with a homogeneous mixture of air and fuel in said first set of cylinders by injecting a first fuel injection quantity during an intake stroke, operating said second set of cylinders in a stratified mode of operation with a stratified mixture of air and fuel in said second set of cylinders by injecting a second fuel injection quantity during a compression stroke, controlling said homogeneous mixture of air and fuel to a desired stoichiometric value by adjusting said first fuel injection quantity of the first set of cylinders based on said first exhaust gas oxygen sensor, and controlling said stratified mixture of air and fuel to a desired value lean of stoichiometry by adjusting said second fuel injection quantity of the second set of cylinders based on said second exhaust gas oxygen sensor. - View Dependent Claims (11, 12, 13)
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14. A vapor recovery control method for a vapor recovery system coupled to a spark ignited engine having an air intake with a throttle positioned therein and having a homogeneous mode of operation with a homogeneous mixture of air and fuel within a plurality of combustion chambers and a stratified mode of operation with a stratified mixture of air and fuel within the plurality of combustion chambers, the engine having a first set of cylinders and a second set of cylinders, the method comprising:
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directing purge vapors into said first set of cylinders; operating said first set of cylinders in the homogeneous mode; and operating said second set of cylinders in the stratified mode. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification