EXHAUST GAS PURIFICATION CONTROLLER FOR ENGINE
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United States of America
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Issued Date -
Feb 20, 2020
app pub date -
Oct 13, 2017
filing date -
Oct 13, 2017
priority date (Note) -
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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 larger when s flow amount of the exhaust gas detected or estimated by an exhaust-gas flow amount detector is larger.
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