Emission treatment system and control method

A method for controlling an emission treatment system including a plasma reactor, comprising:

• applying power to said plasma reactor configured to reduce noxious emissions of an engine;
• detecting a primary voltage and a primary current of a transformer configured to boost a voltage of power supplied to said plasma reactor;
• determining whether said primary voltage of said transformer is less than a predetermined voltage;
• determining whether said primary current of said transformer is less than a predetermined current if it is determined that said primary voltage is less than said predetermined voltage;
• and
• closing a bypass pipe such that exhaust emissions do not bypass said plasma reactor and opening a direct-connecting pipe configured such that exhaust emissions pass through said plasma reactor if it is determined that said primary current is less than said predetermined current.

An emission treatment system, comprising:

• a plasma reactor disposed in a main exhaust pipe and configured to reduce noxious emissions of an engine;
• a bypass pipe connected to said main exhaust pipe both before and after said plasma reactor such that exhaust emissions can bypass said plasma reactor;
• a control valve disposed at a position where said main exhaust pipe and said bypass pipe intersect being configured to selectively open and close said main exhaust pipe and said bypass pipe;
• a power supply unit for supplying power to said plasma reactor, wherein said power supply unit comprises:
• a power source unit for providing power supplied to said plasma reactor;
• and
• a transformer configured to boost a voltage of power supplied from said power source unit and to supply said boosted power to said plasma reactor;
• and
• a control unit coupled to said power supply unit and said control valve wherein said control unit controls a voltage of power supplied to said plasma reactor and an operation of said control valve, wherein said control unit is programmed to perform a control method comprising:
• detecting a primary voltage of said transformer;
• determining whether said detected primary voltage of said transformer is less than a predetermined voltage;
• stopping power supply to said plasma reactor if it is determined that said primary voltage is not less than said predetermined voltage;
• detecting a primary current from said transformer;
• determining whether said primary current of said transformer is less than a predetermined current;
• and
• controlling said control valve such that said exhaust pipe is closed and said bypass pipe is opened and controlling said power supply unit such that a predetermined level of power is supplied to said plasma reactor.