Method of determining correcting logic for reacting model of selective catalytic reduction catalyst, method of correcting parameters of reacting model of selective catalytic reduction catalyst and exhaust system using the same
First Claim
1. A method of determining a correcting logic for a reacting model of a selective catalytic reduction (SCR) catalyst, wherein the reacting model of the SCR catalyst is defined by parameters and has input variables, the method comprising:
- determining, by a controller, nitrogen oxide (NOx) concentration at a downstream of the SCR catalyst and a target injection amount of a reducing agent based on the reacting model of the SCR catalyst;
adjusting, by the controller, the input variables such that an error between the determined NOx concentration and measured NOx concentration is to be a reference error under specific input variables;
determining, by the controller, a correction coefficient such that the error between the determined NOx concentration and the measured NOx concentration is to be minimized under the adjusted input variables;
repeating, by the controller, the adjustment of the input variables and the determination of the correction coefficient after changing the input variables; and
correcting, by the controller, the parameters of the reacting model according to the correction coefficient;
controlling by the controller, an injection of the reducing agent according to the target injection amount determined from the corrected parameters of the reacting model.
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Abstract
Disclosed are a method of determining a correcting logic for a reacting model of an SCR catalyst, a method of correcting parameters of the reacting model of the SCR catalyst and an exhaust system to which the methods are applied. The reacting model of the SCR catalyst is defined by m parameters and has n input variables, where m and n are natural numbers with n smaller than m. The reacting model of the SCR catalyst may be adapted to predict nitrogen oxide (NOx) concentration at a downstream of the SCR catalyst at the least.
4 Citations
20 Claims
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1. A method of determining a correcting logic for a reacting model of a selective catalytic reduction (SCR) catalyst, wherein the reacting model of the SCR catalyst is defined by parameters and has input variables, the method comprising:
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determining, by a controller, nitrogen oxide (NOx) concentration at a downstream of the SCR catalyst and a target injection amount of a reducing agent based on the reacting model of the SCR catalyst; adjusting, by the controller, the input variables such that an error between the determined NOx concentration and measured NOx concentration is to be a reference error under specific input variables; determining, by the controller, a correction coefficient such that the error between the determined NOx concentration and the measured NOx concentration is to be minimized under the adjusted input variables; repeating, by the controller, the adjustment of the input variables and the determination of the correction coefficient after changing the input variables; and correcting, by the controller, the parameters of the reacting model according to the correction coefficient; controlling by the controller, an injection of the reducing agent according to the target injection amount determined from the corrected parameters of the reacting model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An exhaust system comprising:
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an engine adapted to generate exhaust gas while burning fuel and air; an intake pipe connected to and supplying the air to the engine; an exhaust pipe connected to the engine, the exhaust gas flowing through the exhaust pipe; an SCR catalyst mounted on the exhaust pipe and adapted to reduce nitrogen oxide contained in the exhaust gas using a reducing agent; a reducing agent supplying device mounted on the exhaust pipe between the engine and the SCR catalyst and adapted to inject the reducing agent; an input variable detector adapted to detect n input variables, n being a natural number; and a controller including a reacting model of the SCR catalyst for predicting reaction of the SCR catalyst, calculating a target injection amount of the reducing agent by substituting the input variables into the reacting model of the SCR catalyst, and controlling the reducing agent supplying device according to the target injection amount of the reducing agent, wherein the reacting model of the SCR catalyst is defined by m parameters, m being a natural number, and is adapted to predict NOx concentration at a downstream of the SCR catalyst at the least, and wherein the controller further includes a correcting logic for correcting the parameters using an error between the predicted NOx concentration and detected NOx concentration. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification