Adaptive transient fuel compensation for a spark ignited engine
First Claim
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1. A method of adaptive transient fuel compensation for a cylinder in a multi-cylinder engine comprising the steps of:
- estimating fuel puddle dynamics for the cylinder of the multi-cylinder engine by determining parameters of a wall-wetting dynamic model every engine cycle of the multi-cylinder engine; and
adjusting fuel delivery to the cylinder of the multi-cylinder engine dependent on the estimated fuel puddle dynamics using a lead compensator with adjustable zero tuning and a fixed pole tuning while the estimate of a first wall-wetting parameter is small and a wall-wetting dynamics zero identified dependent on the first and a second wall-wetting parameters is invertible, and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while the estimate of the first wall-wetting parameter is large, and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while a wall-wetting dynamics zero, identified dependent on the first and second wall-wetting parameters, is not invertible.
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Abstract
A method and system for adaptive transient fuel compensation in a cylinder of a multi-cylinder engine estimates fuel puddle dynamics for the cylinder by determining parameters of a wall-wetting model every engine cycle of the multi-cylinder engine. Fuel delivery to the cylinder is adjusted dependent on the estimated fuel puddle dynamics.
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Citations
40 Claims
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1. A method of adaptive transient fuel compensation for a cylinder in a multi-cylinder engine comprising the steps of:
- estimating fuel puddle dynamics for the cylinder of the multi-cylinder engine by determining parameters of a wall-wetting dynamic model every engine cycle of the multi-cylinder engine; and
adjusting fuel delivery to the cylinder of the multi-cylinder engine dependent on the estimated fuel puddle dynamics using a lead compensator with adjustable zero tuning and a fixed pole tuning while the estimate of a first wall-wetting parameter is small and a wall-wetting dynamics zero identified dependent on the first and a second wall-wetting parameters is invertible, and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while the estimate of the first wall-wetting parameter is large, and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while a wall-wetting dynamics zero, identified dependent on the first and second wall-wetting parameters, is not invertible.
- estimating fuel puddle dynamics for the cylinder of the multi-cylinder engine by determining parameters of a wall-wetting dynamic model every engine cycle of the multi-cylinder engine; and
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2. A method of adaptive transient fuel compensation for a cylinder in a multi-cylinder engine comprising the steps of:
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estimating a first wall-wetting parameter indicative of a fraction of an amount of fuel injected that is retained on surfaces of an intake system for the cylinder of the multi-cylinder engine in accordance with the following relationship;
##EQU21## estimating a second wall-wetting parameter indicative of a fraction of an amount of fuel vaporized from the surfaces in the intake system for the cylinder of the multi-cylinder engine in accordance with the following relationship;
##EQU22## where;
k is an engine cycle indexu is a filtered value of fuel injected y is a filtered value of measured fuel burned v is a weighted covariance of exhaust gas sensor measurements P1 is an inverse of a weighted covariance of the estimate of c P2 is an inverse of a weighted covariance of the estimate of bv
space="preserve" listing-type="equation">p(k)=[b.sub.v (k)c(k)]'"'"'
space="preserve" listing-type="equation">y(k)=y(k)-y(k-1)+u(k-1)-u(k)
space="preserve" listing-type="equation">h(k)=[(u(k-1)-y(k-1) (u(k-1)-u(k))];and adjusting fuel delivery to the cylinder of the multi-cylinder engine dependent on the estimated first and second wall-wetting parameters. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of adaptive transient fuel compensation for a cylinder in a multi-cylinder engine comprising the steps of:
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estimating a first wall-wetting parameter indicative of a fraction of an amount of fuel injected that is retained on surfaces of an intake system for the cylinder of the multi-cylinder engine; estimating a second wall-wetting parameter indicative of a fraction of an amount of fuel vaporized from the surfaces in the intake system for the cylinder of the multi-cylinder engine; and adjusting fuel delivery using a lead compensator with adjustable zero and pole tuning while the estimate of the first wall-wetting parameter is small and a wall-wetting dynamics zero identified dependent on the first and second wall-wetting parameters is invertible. - View Dependent Claims (15)
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16. A method of adaptive transient fuel compensation for a cylinder in a multi-cylinder engine comprising the steps of:
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estimating a first wall-wetting parameter indicative of a fraction of an amount of fuel injected that is retained on surfaces of an intake system for the cylinder of the multi-cylinder engine; estimating a second wall-wetting parameter indicative of a fraction of an amount of fuel vaporized from the surfaces in the intake system for the cylinder of the multi-cylinder engine; and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while the estimate of the first wall-wetting parameter is large, and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while a wall-wetting dynamics zero, identified dependent on the first and second wall-wetting parameters, is not invertible. - View Dependent Claims (17)
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18. A method of adaptive transient fuel compensation for a cylinder in a multi-cylinder engine comprising the steps of:
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measuring an air charge ingested by the cylinder of the multi-cylinder engine and providing an air mass variable dependent thereon; determining and filtering a value of fuel injected for the cylinder of the multi-cylinder engine and providing a fuel mass injected variable dependent thereon; measuring an exhaust fuel/air ratio in an exhaust system and providing an exhaust fuel/air ratio variable dependent thereon; combining the air mass variable and the exhaust fuel/air ratio variable and providing a measure of fuel burned; filtering the measure of fuel burned and providing a filtered fuel mass burned variable dependent thereon; estimating fuel puddle dynamics for the cylinder of the multi-cylinder engine by determining parameters of a wall-wetting dynamic model on an engine cycle-by-cycle basis dependent on the fuel mass injected variable, and the filtered fuel mass burned variable; and adjusting fuel delivery for the cylinder of the multi-cylinder engine dependent-on the estimated fuel puddle dynamics. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An adaptive transient fuel compensation apparatus for controlling an amount of fuel injected into a cylinder of a multi-cylinder engine comprising:
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a control system for estimating fuel puddle dynamics for the cylinder of the multi-cylinder engine by determining parameters of a wall-wetting dynamic model every engine cycle of the multi-cylinder engine; and a compensator for adjusting fuel delivery to the cylinder of the multi-cylinder engine dependent on the estimated fuel puddle dynamics using a lead compensator with adjustable zero tuning and a fixed pole tuning while the estimate of a first wall-wetting parameter is small and a wall-wetting dynamics zero identified dependent on the first and a second wall-wetting parameters is invertible, and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while the estimate of the first wall-wetting parameter is large, and adjusting fuel delivery using a lead compensator with adjustable zero tuning and a fixed pole while a wall-wetting dynamics zero, identified dependent on the first and second wall-wetting parameters, is not invertible. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification