A system and method for egr rate correction based on internal combustion engine charge factor

Abstract

The invention relates to an EGR rate correction system and method based on the filling factor of an internal combustion engine, and belongs to the field of engines. The method is based on the fillingfactor calibration pulse spectrum in the laboratory standard environment. The strong correlation between the filling factor and the inlet manifold gas temperature is adopted to conduct temperature correction to the filling factor. The actual EGR rate is calculated with the definition equation of filling factor. The actual EGR rate is compared with the target EGR rate calibration value or modifiedvalue to complete closed loop feedback control of the EGR valve opening. The EGR rate correction system and method can accurately determine the EGR rate of the engine in practical use when the EGR system and an intercooler deviate from laboratory calibration conditions due to the operation reasons such as fouling or efficiency change; additional sensors in addition to standing sensors are not required to added; and the characteristics of rich functions and being suitable for promotion are achieved.

Description

Technical field [0001] The invention relates to an EGR rate correction system, in particular to an EGR rate correction system based on an internal combustion engine charge factor, and also to a correction method based on the system, belonging to the field of engines. Background technique [0002] Exhaust Gas Recirculation (EGR) technology is one of the most effective measures to control nitrogen oxide emissions. It has been widely used in advanced low-emission internal combustion engines in the United States, Europe, Japan and other countries, as well as in the country that meets the latest emission regulations. Or national VI diesel engines, but also widely used in gasoline engines and gas fuel internal combustion engines. [0003] EGR technology is one of the most important energy-saving and environmentally-friendly technologies, and its importance can be compared with the aftertreatment devices widely used in various internal combustion engines. One of the core contents of EGR ...

AI Technical Summary

Problems solved by technology

This approach not only requires the addition of additional pressure sensors, but also cannot account for the degradation of the EGR valve and cooler

[0010] The second type of method is to use the temperature signals of the gas temperature sensors of the intake manifold and exhaust manifold to calculate the EGR rate. This method also needs to add additional sensors, and the calculation is very inaccurate. In principle, some methods are even Incorrect

[0012] The above technical solution has problems such as inaccurate or even wrong calculation of EGR rate, need to use additional expensive sensors beyond the range of the permanent sensor of the engine, etc., which increases the cost and increases the durability risk of the sensor, so it is not practical and difficult to promote

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