Measurement system for spraying urea liquid into exhaust flow in combustion engine

Abstract

The invention relates to a measurement system capable of spraying urea solution into exhaust flow (9) of combustion engine for selective catalytic reduction and a control method thereof. The measurement system is connected with a urea solution box (1) to taka out urea solution and the measurement system is also connected with a compressed air supplying device (6) wherein the measurement system comprises at least one nozzle (5) for spraying the urea solution into the exhaust flow in aid of compressed air. The measurement system comprises an air valve (7) to adjust the pressure and / or air amount and / or valve starting time of the compressed air supplying device (6) and a sensor for measuring the pressure and / or air amount in the compressed air supplying device (6) is set between the air valve (7) and the nozzle (5).

Description

technical field

[0001] The invention relates to a metering system for injecting urea solution into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, wherein the metering system can be connected to a urea solution tank from which the urea solution can be withdrawn, Furthermore, the metering system can be connected to a compressed air supply, wherein the metering system has at least one nozzle through which the urea solution can be sprayed into the exhaust gas flow by means of compressed air. Furthermore, the invention relates to a method for controlling the injection of a urea solution into the exhaust gas flow of an internal combustion engine by means of compressed air for selective catalytic reduction. Background technique

[0002] The SCR catalyst is used to reduce the nitrogen oxide emission of the diesel engine. For this purpose, the reducing agent is injected into the exhaust system with a metering device. Ammonia is used as redu...

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