US Patent 7886525 Exhaust gas purification device of internal combustion engine

An exhaust gas purification device of an internal combustion engine is taught that preferably include a storage tank storing an exhaust gas purification solution that is injected into an exhaust passage of the internal combustion engine, a solution supply line that is constructed to introduce the exhaust gas purification solution from the storage tank to the exhaust passage, a supply pump disposed on the solution supply line, and a gas-liquid selection device. The gas-liquid selection device is constructed to selectively introduce the exhaust gas purification solution and air into the solution supply line.