Selective catalytic reduction dosing control
First Claim
1. An emissions control system for treating exhaust gas in a motor vehicle including an internal combustion engine, the emissions control system comprising:
- a reductant injector device;
a selective catalytic reduction (SCR) device; and
a controller configured to;
determine a reductant energizing time for the reductant injector device based on one or more operating conditions of the SCR device;
compute a diagnostic adaptation factor for the reductant energizing time based on an on-board diagnostic signal;
changing a target NH3 storage level of the SCR device to the diagnostic adaptation factor; and
input an amount of reductant into the SCR device by adjusting a reductant energizing time of the reductant injector device to cause the SCR device to store an amount of NH3 substantially equal to the target NH3 storage level;
wherein computing the diagnostic adaptation factor comprises;
determining a diagnostic factor based on the on-board diagnostic signal;
comparing the diagnostic factor with a predetermined threshold; and
in response to the diagnostic factor being greater than the predetermined threshold, computing the diagnostic adaptation factor as a maximum of the diagnostic factor and a predetermined long-term adaptation factor, andin response to the diagnostic factor not being greater than the predetermined threshold, computing the diagnostic adaptation factor as a minimum of the diagnostic factor and the predetermined long-term adaptation factor.
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Accused Products
Abstract
Technical solutions are described for an emissions control system for a motor vehicle including an internal combustion engine. The emissions control system includes a reductant injector device, a selective catalytic reduction (SCR) device, and a controller. The controller determines a reductant energizing time for the reductant injector device based on one or more operating conditions of the SCR device. The controller further computes a diagnostic adaptation factor for the reductant energizing time based on an on-board diagnostic signal. The controller further inputs an amount of reductant into the SCR device by adjusting a reductant energizing time of the reductant injector device according to the diagnostic adaptation factor.
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Citations
15 Claims
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1. An emissions control system for treating exhaust gas in a motor vehicle including an internal combustion engine, the emissions control system comprising:
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a reductant injector device; a selective catalytic reduction (SCR) device; and a controller configured to; determine a reductant energizing time for the reductant injector device based on one or more operating conditions of the SCR device; compute a diagnostic adaptation factor for the reductant energizing time based on an on-board diagnostic signal; changing a target NH3 storage level of the SCR device to the diagnostic adaptation factor; and input an amount of reductant into the SCR device by adjusting a reductant energizing time of the reductant injector device to cause the SCR device to store an amount of NH3 substantially equal to the target NH3 storage level; wherein computing the diagnostic adaptation factor comprises; determining a diagnostic factor based on the on-board diagnostic signal; comparing the diagnostic factor with a predetermined threshold; and in response to the diagnostic factor being greater than the predetermined threshold, computing the diagnostic adaptation factor as a maximum of the diagnostic factor and a predetermined long-term adaptation factor, and in response to the diagnostic factor not being greater than the predetermined threshold, computing the diagnostic adaptation factor as a minimum of the diagnostic factor and the predetermined long-term adaptation factor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An exhaust system for treating exhaust gas emitted by an internal combustion engine, configured to perform a selective catalytic reduction (SCR) of exhaust gas, the exhaust system comprising:
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a controller configured to; compute a diagnostic adaptation factor for an SCR device of the exhaust system based on an on-board diagnostic signal; and input an amount of a reductant into the SCR device by configuring the exhaust system according to the diagnostic adaptation factor, wherein configuring the exhaust system comprises using the diagnostic adaptation factor as a target NH3 storage level of the SCR device; wherein computing the diagnostic adaptation factor comprises; determining a diagnostic factor based on the on-board diagnostic signal; comparing the diagnostic factor with a predetermined threshold; and in response to the diagnostic factor being greater than the predetermined threshold, computing the diagnostic adaptation factor as a maximum of the diagnostic factor and a predetermined long-term adaptation factor, and in response to the diagnostic factor not being greater than the predetermined threshold, computing the diagnostic adaptation factor as a minimum of the diagnostic factor and the predetermined long-term adaptation factor. - View Dependent Claims (9, 10, 11, 12)
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13. A computer-implemented method for controlling a selective catalytic reduction (SCR) device of an exhaust system of an internal combustion engine, the method comprising:
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computing a diagnostic adaptation factor for an SCR device of the exhaust system based on an on-board diagnostic signal; and inputting an amount of reductant into the SCR device by configuring the exhaust system according to the diagnostic adaptation factor, wherein configuring the exhaust system comprises using the diagnostic adaptation factor as a NH3 set-point of the SCR device; wherein computing the diagnostic adaptation factor further comprises; determining a diagnostic factor based on the on-board diagnostic signal; comparing the diagnostic factor with a predetermined threshold; and in response to the diagnostic factor being greater than the predetermined threshold, computing the diagnostic adaptation factor as a maximum of the diagnostic factor and a predetermined long-term adaptation factor, and in response to the diagnostic factor not being greater than the predetermined threshold, computing the diagnostic adaptation factor as a minimum of the diagnostic factor and the predetermined long-term adaptation factor. - View Dependent Claims (14, 15)
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Specification