CONTROLLING EXHAUST GAS RECIRCULATION THROUGH MULTIPLE PATHS IN A TURBOCHARGED ENGINE SYSTEM
First Claim
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1. A method of controlling exhaust gas recirculation (EGR) in a turbocharged engine system including a first EGR path and a second EGR path, the method comprising:
- a) providing first and second EGR setpoints, which are associated with the first and second EGR paths and contribute to a total EGR setpoint; and
b) applying a transfer function to at least one of the first and second EGR setpoints to account for at least one of dead time or lag time associated with the second EGR path.
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Abstract
A method of controlling exhaust gas recirculation (EGR) in a turbocharged engine system including multiple EGR paths to account for at least one of system constraints, or dead time and/or lag time associated with at least one of the EGR paths.
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Citations
53 Claims
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1. A method of controlling exhaust gas recirculation (EGR) in a turbocharged engine system including a first EGR path and a second EGR path, the method comprising:
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a) providing first and second EGR setpoints, which are associated with the first and second EGR paths and contribute to a total EGR setpoint; and b) applying a transfer function to at least one of the first and second EGR setpoints to account for at least one of dead time or lag time associated with the second EGR path. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling exhaust gas recirculation (EGR) in a turbocharged engine system including a first EGR path and a second EGR path, the method comprising:
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a) determining first and second EGR actuator commands corresponding to first and second EGR setpoints; b) applying system constraints to the first and second EGR actuator commands to produce constrained first and second EGR actuator commands; c) determining updated first and second EGR setpoints corresponding to the constrained first and second EGR actuator commands; d) comparing the first EGR setpoint to the updated first EGR setpoint; and e) adjusting the first and second EGR setpoints in response to the comparison of step d) to produce adjusted first and second EGR setpoints. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of controlling exhaust gas recirculation (EGR) in a turbocharged engine system including a first EGR path and a second EGR path, the method comprising:
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a) establishing base first and second EGR setpoints; b) applying system constraints to the base first and second EGR setpoints to produce constrained first and second EGR setpoints; c) determining first and second EGR actuator commands from the constrained first and second EGR setpoints; d) determining updated first and second EGR setpoints corresponding to the determined first and second EGR actuator commands; e) comparing the base first EGR setpoint to the updated first EGR setpoint; and f) adjusting the base second EGR setpoint in response to the comparison of step e) to produce an adjusted second EGR setpoint. - View Dependent Claims (16)
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17. A method of controlling exhaust gas recirculation (EGR) in a turbocharged engine system including a high pressure (HP) EGR path and a low pressure (LP) EGR path, the method comprising:
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a) establishing base HP and LP EGR setpoints, which are associated with the HP and LP EGR paths and contribute to a total EGR setpoint; b) applying system constraints to at least one of the base HP and LP EGR setpoints of step a) or the adjusted HP and LP EGR setpoints from step h) to produce constrained RP and LP EGR setpoints; c) determining HP and LP EGR actuator commands corresponding to at least one of the base HP and LP EGR setpoints established in step a), the constrained HP and LP EGR setpoints of step b), or the adjusted HP and LP EGR setpoints from step h); d) applying respective actuator limits to the HP and LP EGR actuator commands determined in step c) to produce updated HP and LP EGR actuator commands; e) determining updated HP and LP EGR setpoints corresponding to the updated HP and LP EGR actuator commands from step d); f) applying a transfer function to the updated LP EGR setpoint from step e) to produce a modified LP EGR setpoint; g) comparing the updated HP and modified LP EGR setpoints to the base RP and LP EGR setpoints from step a); and h) adjusting the base HP and LP EGR setpoints based on the comparison from step g) to generate adjusted HP and LP EGR setpoints. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A product comprising:
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a controller to control exhaust gas recirculation (EGR) and configured to; provide first and second EGR setpoints, which are associated with first and second EGR paths and contribute to a total EGR setpoint, and apply a transfer function to at least one of the first and second EGR setpoints to account for at least one of dead time or lag time associated with the second EGR path. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A product comprising:
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a controller to control exhaust gas recirculation (EGR) and configured to; determine first and second EGR actuator commands corresponding to first and second EGR setpoints; apply system constraints to the determined first and second EGR actuator commands to produce constrained first and second EGR actuator commands; determine updated first and second EGR setpoints corresponding to the constrained first and second EGR actuator commands; compare the first EGR setpoint to the updated first EGR setpoint; and adjust the first and second EGR setpoints in response to the comparison to produce adjusted first and second EGR setpoints. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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38. A product comprising:
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a controller to control exhaust gas recirculation (EGR) and configured to; establish base first and second EGR setpoints; apply system constraints to the base first and second EGR setpoints to produce constrained first and second EGR setpoints; determine first and second EGR actuator commands from the constrained first and second EGR setpoints; determine updated first and second EGR setpoints corresponding to the determined first and second EGR actuator commands; compare the base first EGR setpoint to the updated first EGR setpoint; and adjust the base second EGR setpoint in response to the comparison to produce an adjusted second EGR setpoint. - View Dependent Claims (39)
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40. A product comprising:
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a controller to control exhaust gas recirculation (EGR) and configured to; establish base HP and LP EGR setpoints, which are associated with HP and LP EGR paths and contribute to a total EGR setpoint; apply system constraints to at least one of the established base HP and LP EGR setpoints or adjusted HP and LP EGR setpoints to produce constrained HP and LP EGR setpoints; determine HP and LP EGR actuator commands corresponding to at least one of the established base HP and LP EGR setpoints, the constrained HP and LP EGR setpoints, or the adjusted HP and LP EGR setpoints; apply respective actuator limits to the determined HP and LP EGR actuator commands to produce updated HP and LP EGR actuator commands; determine updated HP and LP EGR setpoints corresponding to the updated HP and LP EGR actuator commands; apply a transfer function to the updated LP EGR setpoint to produce a modified LP EGR setpoint; compare the updated HP and modified LP EGR setpoints to the established base HP and LP EGR setpoints; and adjust the base HP and LP EGR setpoints based on the comparison to generate the adjusted HP and LP EGR setpoints. - View Dependent Claims (41, 42, 43, 44, 45, 46)
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47. A product comprising:
an intake throttle valve to control exhaust gas recirculation, and located downstream of an inlet end of an induction subsystem and upstream of a turbocharger compressor. - View Dependent Claims (48, 49, 50, 51, 52, 53)
Specification