Automatic calibration system for urea metering jet pumps and calibration method thereof

Abstract

The invention relates to an automatic calibration system for urea metering jet pumps, and the system comprises an urea tank, a metering jet pump, a weighing device, a container, a jet pipeline, a reversing valve, a return pipeline and a control module, wherein the container is arranged on the weighing device, and the jet pipeline is arranged at the downstream of the metering jet pump; the urea tank, the metering jet pump and the container are sequentially communicated through pipelines, the reversing valve is arranged at the downstream of the metering jet pump, the jet pipeline is communicated with the reversing valve and the container, and the return pipeline is communicated with the reversing valve and the urea tank; and the control module is electrically connected with the reversing valve, and controls the reversing action of the reversing valve. The invention also relates to a calibration method of the automatic calibration system for the urea metering jet pumps. The system disclosed by the invention is simple in structure and convenient in automatic control operation, and does not cause human errors, thereby greatly improving the calibration efficiency and the calibration precision.

Description

technical field [0001] The invention relates to a calibration system and method for a diesel vehicle exhaust post-treatment purification system, in particular to an automatic calibration system and a calibration method for a urea metering injection pump. Background technique [0002] The increasing number of motor vehicles poses a serious threat to the environment. Therefore, the emission standards of motor vehicles are also continuously improved, and the vehicle exhaust purification system is also increasingly concerned by motor vehicle manufacturers. Selective catalytic reduction technology (SCR) is a diesel vehicle exhaust The most common technical route in the post-treatment technology, this technology is to spray the reducing agent (urea aqueous solution) into the exhaust pipe through quantitative atomization, and chemically react with the exhaust gas to achieve the purpose of purification. In this process, the urea injection pump involves a problem of metering accuracy...

AI Technical Summary

Problems solved by technology

If too much reductant is injected, it will not only lead to waste of reductant, but also cause ammonia leakage and secondary pollution; if too little reductant is injected, the reaction will be insufficient and the NOx emission reduction requirements will not be met. Calibrate each factory-made urea pump to meet the accuracy requirements

[0003] In the prior art, purely manual calibration methods are used, that is, timing, nozzle switching and data recording are all manual operations, which consumes a lot of time, and there are many human errors mixed in it, which is difficult to avoid, so a separate design and calibration is required System, realize automatic calibration, improve accuracy and production efficiency

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