Imbalance re-synchronization control systems and methods
First Claim
1. A method for a vehicle, comprising:
- determining imbalance values for cylinders of an engine based on samples of an exhaust gas oxygen signal generated using an exhaust gas oxygen (EGO) sensor;
determining an offset value that relates one of the imbalance values with one of the cylinders;
determining a fueling correction for the one of the cylinders based on the one of the imbalance values;
selectively adjusting fueling to the one of the cylinders based on the fueling correction;
re-synchronizing the imbalance values with the cylinders, respectively, in response to generation of a first indicator;
incrementing a counter value when the fueling correction is equal to one of a first predetermined value and a second predetermined value and was previously equal to the other one of the first and second predetermined values, wherein the first and second predetermined values are different; and
selectively generating the first indicator when the counter value is greater than a third predetermined value,wherein the third predetermined value is an integer greater than zero.
3 Assignments
0 Petitions
Accused Products
Abstract
Fueling to one cylinder of an engine is selectively adjusted based on a correction associated with the cylinder. An instability module increments a counter value when the correction is equal to one of a first predetermined value and a second predetermined value and was previously equal to the other one of the first and second predetermined values. The instability module selectively generates a first indicator based on the counter value. A variance of imbalance values can be determined based on samples of an exhaust gas oxygen signal. Two variances are determined: one variance with adjustment based on the correction, one without adjustment based on the correction. A variance checking module selectively generates a second indicator based on the first and second variances. A re-synchronization module re-synchronizes the imbalance values with the cylinders, respectively, in response to generation of the first indicator and/or the second indicator.
34 Citations
23 Claims
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1. A method for a vehicle, comprising:
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determining imbalance values for cylinders of an engine based on samples of an exhaust gas oxygen signal generated using an exhaust gas oxygen (EGO) sensor; determining an offset value that relates one of the imbalance values with one of the cylinders; determining a fueling correction for the one of the cylinders based on the one of the imbalance values; selectively adjusting fueling to the one of the cylinders based on the fueling correction; re-synchronizing the imbalance values with the cylinders, respectively, in response to generation of a first indicator; incrementing a counter value when the fueling correction is equal to one of a first predetermined value and a second predetermined value and was previously equal to the other one of the first and second predetermined values, wherein the first and second predetermined values are different; and selectively generating the first indicator when the counter value is greater than a third predetermined value, wherein the third predetermined value is an integer greater than zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for a vehicle, comprising:
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determining imbalance values for cylinders of an engine based on samples of an exhaust gas oxygen signal generated using an exhaust gas oxygen (EGO) sensor; determining an offset value that relates one of the imbalance values with one of the cylinders; determining a fueling correction for the one of the cylinders based on the one of the imbalance values; selectively adjusting fueling to the one of the cylinders based on the fueling correction; re-synchronizing the imbalance values with the cylinders, respectively, in response to generation of an indicator; determining a variance of the imbalance values; applying a filter to the variance to generate a filtered variance; selectively setting a first variance equal to the filtered variance; setting the fueling correction equal to a predetermined value for a predetermined period, wherein the fueling to the one of the cylinders is unadjusted when the fueling correction is equal to the predetermined value; selectively setting a second variance equal to the filtered variance in response to the end of the predetermined period; setting a synchronization metric equal to the second variance divided by the first variance; and selectively generating the indicator based on the synchronization metric. - View Dependent Claims (12, 13)
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14. A system for a vehicle, comprising:
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an imbalance module that determines imbalance values for cylinders of an engine based on samples of an exhaust gas oxygen signal generated using an exhaust gas oxygen (EGO) sensor; an offset module that determines an offset value that relates one of the imbalance values with one of the cylinders; a correction module that determines a fueling correction for the one of the cylinders based on the one of the imbalance values, wherein fueling to the one of the cylinders is selectively adjusted based on the fueling correction; an instability module that increments a counter value when the fueling correction is equal to one of a first predetermined value and a second predetermined value and was previously equal to the other one of the first and second predetermined values and that selectively generates an indicator when the counter value is greater than a third predetermined value, wherein the first and second predetermined values are different, and wherein the third predetermined value is an integer greater than zero; and a re-synchronization module that re-synchronizes the imbalance values with the cylinders, respectively, in response to generation of the indicator. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification