Low-pressure waste gas recirculating system suitable for biodiesel engine and control method

Abstract

The invention relates to a low-pressure waste gas recirculating system suitable for a biodiesel engine and a control method. The low-pressure waste gas recirculating system comprises an intercooling unit, a sensor assembly and a valve body. The intercooling unit communicates with a pipeline between a turbine and a selective catalytic reducer. The intercooling unit communicates with a pipeline between a throttle valve and a supercharger through the valve body. The sensor assembly comprises a second temperature sensor, a first pressure sensor, a second pressure sensor and an NOX sensor. The first pressure sensor is located between the valve body and the intercooling unit. The second pressure sensor is located between the throttle valve and the supercharger. The second temperature sensor is located between the turbine and the selective catalytic reducer. The NOX sensor is located at the downstream of the selective catalytic reducer. Compared with the prior art, the emission of NOX in theexhausted gas of the biodiesel engine can be thoroughly reduced, and therefore increasingly strict emission regulations can be met.

Description

technical field [0001] The invention relates to the field of biodiesel engine emission reduction, in particular to a low-pressure exhaust gas recirculation system and control method suitable for biodiesel engines. Background technique [0002] Petroleum is the main fuel of global energy consumption, and its energy accounted for 32.9%. However, as a fossil fuel, petroleum is a non-renewable resource. With the passage of time, its reserves are decreasing year by year, and the environmental pollution caused by it is becoming more and more serious, so it is urgent to seek clean and renewable energy to replace traditional fossil fuels. [0003] Biodiesel has high energy density, good antiknock performance, easy storage and transportation, and is renewable. Therefore, for diesel engines, biodiesel is a good alternative fuel. However, biodiesel engines burning biodiesel have high NO X characteristics of emissions. Therefore, how to reduce NO X Emissions are a research focus o...

AI Technical Summary

Problems solved by technology

It can be seen that the above-mentioned patents reduce the NO of the biodiesel engine by directly improving the fuel. X Emissions, however, currently there is no direct use of biodiesel engine internal purification technology and post-treatment technology to solve the problem of high NO in biodiesel engines X System and method for discharge

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