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1. (WO2017176242) EMISSIONS CONTROL SYSTEMS AND METHODS FOR VEHICLES

Pub. No.:    WO/2017/176242    International Application No.:    PCT/US2016/025864
Publication Date: Fri Oct 13 01:59:59 CEST 2017 International Filing Date: Tue Apr 05 01:59:59 CEST 2016
IPC: F01N 3/10
B01D 53/94
F01N 3/02
F01N 3/05
F01N 3/08
F01N 3/18
F01N 3/20
Applicants: TECOGEN INC.
Inventors: ROY, Jean
Title: EMISSIONS CONTROL SYSTEMS AND METHODS FOR VEHICLES
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.