| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for preventing the freezing of the liquid reducing agent to be injected for supply to the upstream of the exhaust gas cleaning catalyst arranged in an exhaust system formed of an exhaust manifold, an exhaust pipe and a muffler of an internal combustion engine such as a diesel engine at cold time in a storage tank and a supplying pipeline. SOLUTION: A heating wire 9-2 is arranged over or a main part of a storage tank 7 and a supplying pipeline for the liquid reducing agent, and an enveloping layer of the heat insulating material is provided thereon, and furthermore, a heating wire heating means 9-1 is provided in the storage tank 7 at need, and these heating wires are electrified and electrifying is cut from outside in response to the atmospheric temperature and/or reducing agent temperature so as to maintain the appropriate temperature range for preventing the freezing of the liquid reducing agent.
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