Exhaust gas purification apparatus

An exhaust gas purification apparatus comprising:

• an additive injection valve injecting an additive from at least one injection orifice into an exhaust gas passage defined by an exhaust pipe through which an exhaust gas flows, the additive injection valve being mounted directly to said exhaust pipe;
• and
• a catalyst disposed downstream of said additive injection valve promoting an exhaust purification reaction using said additive to purify said exhaust gas;
• said exhaust gas purification apparatus being configured to inject-supply, from said additive injection valve, said additive to said exhaust gas upstream of said catalyst, and supply said catalyst with said injected additive together with said exhaust gas utilizing an exhaust flow of said exhaust gas so that said exhaust purification reaction is performed on said catalyst,
• wherein a centerline of a flow passage through said additive injection valve is mounted at an acute angle with respect to an exhaust gas flow direction such that a center line of spray of said additive injected from said injection orifice extends in a direction opposite to the exhaust gas flow direction.

An exhaust gas purification apparatus comprising:

• an additive injection valve injecting an additive from a first and a second injection orifice into an exhaust gas passage defined by an exhaust pipe through which an exhaust gas flows;
• a catalyst disposed downstream of said additive injection valve promoting an exhaust purification reaction using said additive to purify said exhaust gas;
• said exhaust gas purification apparatus being configured to inject-supply, from said first additive injection valve, said additive to said exhaust gas by said additive injection valve upstream of said catalyst, and supply said catalyst with said injected additive together with said exhaust gas utilizing an exhaust flow of said exhaust gas so that said exhaust purification reaction is performed on said catalyst,
• wherein said additive injection valve is mounted such that said additive is injected from said first injection orifice in a first direction opposite to a direction of an exhaust gas flow and said additive is injected from said second injection orifice in the direction of said exhaust gas flow.