EXHAUST GAS PURIFICATION CONTROLLER FOR ENGINE
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United States of America
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Feb 20, 2020
app pub date -
Oct 13, 2017
filing date -
Oct 13, 2017
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Abstract
An NH3 supply amount controller reduces and adjusts a supply amount of NH3 to an SCR catalyst by an NH3 supplier, when an exhaust gas flowing into an NOX catalyst has a rich air-fuel ratio and NOX occluded by the NOX catalyst is reduced to N2. A reduction amount of the supply amount of the NH3 controlled by the NH3 supply amount controller is set smaller when a temperature of the NOX catalyst detected or estimated by an NOX catalyst temperature detector is higher.
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