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AssigneeNissan Diesel Motor Co., Ltd.
InventorsKiminobu Hirata, Nobuhiko Masaki, Masakazu Yano
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In relation to an exhaust gas purification system that mixes a liquid reducing agent with air and injection-supplies this mixture into an exhaust gas flowing on an upstream side of a reduction catalyst (20) to thereby effect reduction purification of NOx in exhaust gas, a technical attention is directed to the relation of respective elements of; the travel distance, the fuel consumption, the air consumption, or the running time and the like, and the liquid reducing agent consumption, to constitute a configuration such that a continual monitor as to whether the injection condition of liquid reducing agent is normal or abnormal is executed by judging whether or not the amount of liquid reducing agent consumed for a predetermined travel distance, a predetermined fuel consumption, a predetermined air consumption, or a predetermined running time, is within a predetermined range.
An apparatus for judging a condition of injection of reducing agent in an exhaust gas purification system comprising a reduction catalyst disposed in an exhaust system of an engine to reduce and purify nitrogen oxide in an exhaust gas, and a reducing agent injection supply means that mixes liquid reducing agent in an amount required depending on an engine operating state with air and injection-supplies this air-mixed reducing agent into the exhaust gas flowing on an upstream side of the reduction catalyst, wherein there is provided such a configuration that a condition of injection of the liquid reducing agent is judged by using at least one of a plurality of judgment means selected from:
Dependencies are inferred from the claim text.