Emissions control systems and methods for vehicles
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United States of America Patent
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Jun 12, 2018
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N/A
app pub date -
Apr 4, 2016
filing date -
Apr 4, 2016
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Abstract
Systems and methods of reducing the emissions of vehicles having a spark ignited internal combustion engine are provided. When the exhaust temperature is less than a set point temperature, the oxygen concentration of the exhaust is increased as the exhaust passes from a first stage catalytic converter to a second stage catalytic converter. The increased oxygen content of the exhaust improves the removal efficiency of carbon monoxide and/or hydrocarbons at the second stage catalytic converter without (or with minimal) reforming nitrogen oxide compounds. The oxygen concentration of the exhaust is not increased when the exhaust temperature is greater than the set point temperature.
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