Device and method for discriminating liquid
By using the heat transfer characteristics between two points of phase separation to detect the liquid reductant concentration in a moving vehicle, and combining it with a counting mechanism, the problem of reduced detection accuracy of the liquid reductant concentration is solved, and high-precision liquid state identification and NOx purification are achieved. Maintenance of performance.
Inactive Publication Date: 2008-05-28
VOLVO TRUCK CORP
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Problems solved by technology
When the liquid reducing agent convects, the heat transfer characteristics of the heat transfer medium change, so the concentration detection accuracy of the liquid reducing agent is significantly reduced
Method used
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[0019] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[0020] FIG. 1 shows the structure of an exhaust gas purification system provided with a liquid discrimination device of the present invention.
[0021] Exhaust gas from the engine 10 is discharged into the atmosphere from an exhaust manifold 12 through an exhaust pipe 16 provided with a NOx reduction catalyst 14 . Specifically, three types of catalysts, namely, an oxidation catalyst for nitrogen monoxide (NO), a reduction catalyst for NOx, and an ammonia slip oxidation catalyst converter, are arranged sequentially from the upstream side of the exhaust gas in the exhaust pipe 16. A concentration sensor, an oxygen sensor, and the like are arranged front and back to constitute an exhaust system, but are not shown in detail. In addition, the liquid reducing agent stored in the storage tank 18 passes through the reducing agent supply device 20 and the injection nozz...
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A concentration sensor which detects the concentration of a liquid reducing agent based on a heat transfer characteristic between two spaced positions is attached to a storage tank which stores the liquid supplied to a NO x reduction catalytic converter. Then, the concentration is read out from the concentration sensor, and when the concentration is equal to or less than 0%, it is discriminated that the liquid in the storage tank is the water. Namely, it is utilized that, since the concentration of the water is 0% if converted into the concentration of the liquid reducing agent, the concentration of the water is equal to or less than 0% even if lowered due to the convection. Further, if the concentration is more than the predetermined concentration, it can be considered that an output from the concentration sensor becomes abnormal because the storage tank is empty. Therefore, it is discriminated that the storage tank is empty. On the other hand, when the concentration is more than 0% and also equal to or less than the predetermined concentration, although there is a possibility that the concentration includes an error, it is discriminated that the liquid in the storage tank is the liquid reducing agent.
Description
technical field [0001] The present invention relates to a concentration sensor that uses the concentration of liquid reducing agent detected by the heat transfer characteristics between two points of phase separation to accurately distinguish the nitrogen oxide reduction catalyst supplied to the exhaust system of the engine of a mobile vehicle. Liquid technology. Background technique [0002] As a catalyst purification system for removing nitrogen oxides (NOx) contained in engine exhaust gas, an exhaust gas purification device disclosed in JP 2000-27627 A has been proposed. This exhaust purification device arranges a NOx reduction catalyst in the engine exhaust system, and injects the reducing agent to the exhaust upstream of the NOx reduction catalyst, so that the NOx in the exhaust gas and the reducing agent undergo a catalytic reduction reaction, and An exhaust purification device that purifies NOx into harmless components. The reducing agent is stored in a storage tank...
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IPC IPC(8): F01N3/00F01N3/08F01N3/20
CPCF01N3/206Y02T10/24Y02A50/20Y02T10/12
Inventor 仁科充广加藤寿一栗田弘之
Owner VOLVO TRUCK CORP