US Patent 7895829 Exhaust purification device of engine
Patent 7895829 was granted and assigned to Denso on March, 2011 by the United States Patent and Trademark Office.
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A DPF and a SCR catalyst are provided in an exhaust pipe, and a urea solution addition valve is provided between the DPF and the SCR catalyst for performing addition supply of urea solution into the exhaust pipe. In a urea solution supply system, the urea solution of prescribed concentration is stored in a urea solution tank, and a urea solution pump is provided in the tank. A urea solution supply pipe is connected to the urea solution pump. A part of the urea solution supply pipe is structured as a compound pipe structure defining two passages. One of the two passages serves as a urea solution passage, and the other one serves as an engine coolant passage.
US Patent 07895829 Exhaust purification device of engine US Patent 7895829 Exhaust purification device of engine
US Patent 07895829 Exhaust purification device of engine
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