Engine and aftertreatment optimization system
First Claim
1. An optimization system for an engine device and aftertreatment subsystem comprising:
- a cascade comprising “
n”
devices, the “
n”
devices of the cascade including at least an engine device and two or more aftertreatment devices of an aftertreatment subsystem; and
wherein;
the engine device comprises;
an engine; and
an engine controller connected to the engine;
each aftertreatment device of the two or more aftertreatment devices comprises;
an aftertreatment mechanism; and
an aftertreatment controller connected to the aftertreatment mechanism;
each device has an optimality index;
an overall optimality index is deduced from the optimality indices of the devices, wherein the engine controllers and the aftertreatment controllers of the cascade are configured to operate the engine device and aftertreatment devices to optimize the overall optimality index;
the engine controller or the aftertreatment controller, respectively, of device “
n”
optimizes costs for the optimality index relative to controls for a current state of device “
n”
, letting properties of inlet gas properties be parameters of an optimal solution which is found as a parametric solution;
the parametric solution is passed upstream to a controller of a neighboring device “
n-1”
;
the controller of device “
n-1”
is configured to optimize costs for the optimality index of device “
n-1”
plus the parametric solution from device “
n”
having optimality cost information from device “
n”
;
a received solution from device “
n”
parameterized by the inlet properties of device “
n”
are outlet properties of device “
n-1”
;
a parametric solution of device “
n-1”
is passed upstream to the controller of a neighboring device “
n-2”
;
an immediate previous step is repeated until a device “
1”
of the cascade receives a parametric solution of a previously neighboring device; and
the device “
1”
is the engine device.
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Abstract
An approach and system for engine and aftertreatment system optimization. Emissions of an engine may be reduced by an aftertreatment mechanism. Control of the engine and the aftertreatment mechanism may be coordinated for the best overall efficiency relative to both fuel consumption and the emissions reduction. Engine and aftertreatment control may also be optimized in terms of cost function minimization. Individual efficiencies of the engine and aftertreatment mechanism are not necessarily significant by themselves. Therefore, the engine and aftertreatment mechanism should be controlled in a manner to achieve the optimality of the engine and the aftertreatment mechanism together as one entity.
495 Citations
18 Claims
-
1. An optimization system for an engine device and aftertreatment subsystem comprising:
-
a cascade comprising “
n”
devices, the “
n”
devices of the cascade including at least an engine device and two or more aftertreatment devices of an aftertreatment subsystem; andwherein; the engine device comprises; an engine; and an engine controller connected to the engine; each aftertreatment device of the two or more aftertreatment devices comprises; an aftertreatment mechanism; and an aftertreatment controller connected to the aftertreatment mechanism; each device has an optimality index; an overall optimality index is deduced from the optimality indices of the devices, wherein the engine controllers and the aftertreatment controllers of the cascade are configured to operate the engine device and aftertreatment devices to optimize the overall optimality index; the engine controller or the aftertreatment controller, respectively, of device “
n”
optimizes costs for the optimality index relative to controls for a current state of device “
n”
, letting properties of inlet gas properties be parameters of an optimal solution which is found as a parametric solution;the parametric solution is passed upstream to a controller of a neighboring device “
n-1”
;the controller of device “
n-1”
is configured to optimize costs for the optimality index of device “
n-1”
plus the parametric solution from device “
n”
having optimality cost information from device “
n”
;a received solution from device “
n”
parameterized by the inlet properties of device “
n”
are outlet properties of device “
n-1”
;a parametric solution of device “
n-1”
is passed upstream to the controller of a neighboring device “
n-2”
;an immediate previous step is repeated until a device “
1”
of the cascade receives a parametric solution of a previously neighboring device; andthe device “
1”
is the engine device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for optimization of a cascade engine system and aftertreatment system, comprising:
-
providing an engine system having a first gas outlet; providing an aftertreatment system having a gas inlet connected to the first gas outlet, and having a last gas outlet; calculating an aftertreatment system optimal cost function value for the aftertreatment system as a function of properties of out gas from the engine system, wherein calculating the aftertreatment system optimal cost function value comprises; determining an optimal cost function value modifier with the aftertreatment controller of each of a plurality of aftertreatment subsystems of the aftertreatment system; and communicating the optimal cost function value modifier from one of the aftertreatment subsystems to the next upstream aftertreatment subsystem for use in determining an optimal cost function value modifier for that next upstream aftertreatment subsystem; communicating the aftertreatment system optimal cost function value to the engine system; calculating an engine system optimal cost function value of the engine system; determining a cascade optimal cost function value at the engine system for a cascade comprising the engine system and the aftertreatment system; applying optimal control settings to the engine system to operate the engine system and aftertreatment system according to the determined cascade optimal cost function value; and wherein the calculating is effected with one or more processors in communication with one or more of the engine system and the aftertreatment system. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system for optimization of an engine and aftertreatment system, comprising:
-
an engine having a gas outlet; an aftertreatment system having a gas inlet connected to the gas outlet of the engine, the aftertreatment system comprising a plurality of aftertreatment subsystems each having a subsystem controller; a first controller connected to the engine; and a second controller connected to the aftertreatment system and to the first controller; and wherein; the second controller is configured to determine an optimal aftertreatment performance cost function value of the engine and provides the optimal aftertreatment performance cost function value to the first controller, wherein determining the optimal aftertreatment performance cost function value comprises; a subsystem controller of a first aftertreatment subsystem determining an aftertreatment performance cost function value for the first aftertreatment subsystem and communicating the determined aftertreatment performance cost function value for the first aftertreatment subsystem to a subsystem controller of a second aftertreatment subsystem upstream of the first aftertreatment subsystem for use in determining an aftertreatment performance cost function value for the second aftertreatment subsystem; and the first controller provides optimal control signals to the engine to operate the engine and aftertreatment system based on the optimal aftertreatment performance cost function value. - View Dependent Claims (16, 17, 18)
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Specification