EGR flow verification system

Abstract

The invention discloses an EGR flow verification system. The EGR flow verification system comprises a temperature sensor, a differential pressure sensor, a pressure sensor, an EGR control valve and anengine ECU. The temperature sensor, the differential pressure sensor, the pressure sensor and the EGR control valve are sequentially connected to an exhaust gas pipe. The EGR control valve is connected with a mixer. The temperature sensor, the differential pressure sensor, the pressure sensor and the EGR control valve are each connected with the engine ECU. EGR passes through the temperature sensor, the differential pressure sensor, the pressure sensor and the EGR control valve and enters the mixer. Data measured by the temperature sensor, the differential pressure sensor and the pressure sensor are transmitted to the engine ECU through a wiring harness. By means of the EGR flow verification system, precise verification of the EGR flow can be achieved; the problem that out-of-limit emission is caused by abnormal work of an engine is reduced, and emission of harmful products is reduced; and the fault point can be found rapidly, and the engine maintenance time is shortened. The EGR flowverification system is simple in structure and convenient to arrange.

Description

technical field [0001] The invention relates to a flow verification system, relates to an EGR natural gas engine, and belongs to the technical field of engines. Background technique [0002] EGR (Exhaust Gas Recirculation), that is, exhaust gas recirculation, is to introduce a part of the exhaust gas of the engine into the intake pipe, and enter the cylinder together with the mixed gas for combustion. Mixing exhaust gas into the mixed gas can effectively reduce the combustion temperature and slow down the combustion speed, so it can effectively suppress the formation of NOx. However, because the gas is mixed with exhaust gas, it will affect the combustion performance of the gas and reduce the output power of the engine, so the flow of EGR needs to be strictly controlled. To control the flow of EGR, the focus is on the measurement of EGR flow. Although the current EGR control valve can accurately control and measure the EGR flow rate, once the EGR control valve fails and th...

AI Technical Summary

Problems solved by technology

Although the current EGR control valve can accurately control and measure the EGR flow rate, once the EGR control valve fails and the measurement is inaccurate, the EGR rate of the engine cannot be guaranteed to meet the design requirements, resulting in insufficient engine power or the generation of NOx too many situations

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