Air mixing and metering system for processing vehicle exhaust

Abstract

The invention relates to an air incorporation measurement system used for vehicle exhaust-gas disposal. The system is characterized in that the measurement system comprises a measurement supply unit, a measurement drive part, an air solenoid valve, a spillover valve, a urea tank, a pressure accumulation cavity temperature sensor, a mixing cavity pressure sensor, a DCU control part, and a catalyst, etc. The measurement supply unit is connected with the catalyst, the air solenoid valve is connected with a quick coupling, an outlet quick coupling is connected with a nozzle by a pipeline, urea solution in the urea tank is conveyed to the measurement supply unit by a membrane pump, a reflux inlet is connected with the spillover valve by the quick coupling, the reflux flows to the urea tank, a compressed air inlet is connected with a compressed air source, and a mixing outlet sprays gas-liquid mixture into an exhaust duct through the nozzle by means of being connected with the pipeline. Themeasurement system of the invention features compact structure, small volume, light weight and accurate measurement, thus saving much space for vehicle layout while maintaining relatively high measuring accuracy and fog effect and ensuring reliability of normal operation in different areas and environments.

Description

technical field [0001] The invention relates to an air mixing and metering system for vehicle exhaust treatment, in particular to a liquid metering and supply device for aftertreatment of vehicle exhaust. Background technique [0002] At present, the Urea-SCR system has become the preferred technology for NOx purification of heavy-duty diesel vehicles meeting Euro V and US 2007 requirements. This technology path has a strong potential for upgrading, leaving room for higher emission requirements. This consensus has gradually formed in my country, and the SCR system has gradually become the preferred path for major manufacturers to meet the next round of emission requirements. The key to the SCR system is to optimize the internal combustion of the engine, and then spray a well-atomized, chemically reactive equivalent dose of urea solution into the exhaust pipe by predicting the amount of NOx emissions. In the prior art, the entire system is expensive and has a complex and hug...

AI Technical Summary

Problems solved by technology

In the prior art, the entire system is expensive and has a complex and huge structure. It mainly includes a DCU controller, a compressed air delivery unit (including a pressure limiter, a 2 / 2 reversing valve and a check valve), and a urea solution supply unit (check valve). Return valve, filter, delivery pump, pressure regulator, pressure sensor, exhaust valve, return line and another check valve, etc.), electromagnetic metering unit and injector that introduces the mixed gas into the exhaust line, each part The internal parts are all independent parts, which are packaged after being connected by pipelines. When the external assemblies are connected, the entire system is connected into a whole through connecting plugs. The volume is large and the integration level is not high, which is not conducive to layout in a limited space.

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