| 摘要 |
The present invention relates to an injection system of a sub-reducing agent for exhaust after-treatment system which comprises: a fuel injection system of reducing agent which provides fuel used as reducing agent in the exhaust after-treatment system; a collection apparatus connected with a fuel tank, and has absorbent installed which absorbs the evaporative emissions of fuel; an air entry unit desorbing the absorbent evaporative emission; a temperature controlling unit which heats and cools an interior temperature of a reducing agent collection apparatus; a connection tube which that connects a desorbed fuel gas from the reducing agent collection apparatus to the injection unit for fuel injection system of reducing agent, a connection unit composed with a control valve which is installed on the center of a connection tube and controls a selective injection of the reducing agent into the exhaust after-treatment system; and a fuel tank, a temperature control unit, and an electronic control unit which controls a control valve. As a result, the present invention can adjuvant inject reducing agent, and provides a system which can recycle possible loss of evaporated fuel within the fuel tank; thereby providing the system which increases the efficiency of the exhaust after-treatment system, and the fuel efficiency from efficient fuel recycle. |
