Method and system for monitoring cooling efficiency of exhaust gas recirculation system and storage medium

Abstract

The invention provides a method and system for monitoring the cooling efficiency of an exhaust gas recirculation system and a storage medium. The method comprises the steps that the intake temperatureT2 of an intake manifold of an engine is calculated according to the exhaust gas temperature Tout of the outlet end of a cooler, the air inlet amount m1 of an air inlet pipe, the air inlet temperature T1 of the air inlet pipe and the total air inlet volume V2 and the total air inlet pressure P2 of intake manifold of the engine; the rotating speed and the circulating fuel injection quantity of theengine are obtained, and the real-time combustion temperature rise temperature dT is determined according to the rotating speed and the circulating fuel injection quantity of the engine; the exhausttemperature T3 of an exhaust manifold of the engine is calculated according to the real-time combustion temperature rise temperature dT and the intake temperature T2 of the intake manifold of the engine; the water inlet temperature TW of the cooler is obtained; and the cooling efficiency epsilon of the exhaust gas recirculation system is obtained according to the water inlet temperature TW of thecooler, the exhaust temperature T3 of the exhaust manifold of the engine and the exhaust gas temperature Tout of the outlet end of the cooler. The method for monitoring the cooling efficiency of the exhaust gas recirculation system has the beneficial effects of being low in manufacturing cost and simple in algorithm.

Description

[0001] The invention relates to the field of monitoring the cooling efficiency of an exhaust gas recirculation system of an automobile, in particular to a monitoring method, system and storage medium for the cooling efficiency of an exhaust gas recirculation system. Background technique [0002] The exhaust gas recirculation (Exhaust Gas Recirculation, EGR) system is the main means of reducing NOx emissions of automobile engines at this stage. Oxygen concentration inside, and reduce the combustion temperature to achieve a low-temperature and low-oxygen combustion environment, thereby reducing the formation of NOx. [0003] The EGR system generally adds a cooler (heat exchange device) in the EGR pipeline to reduce the temperature of the EGR airflow to achieve a low temperature condition. The requirement for the temperature Tout downstream of the EGR should not be too high, so it determines that the cooling efficiency of the EGR cooler needs to be relatively high. high level. T...

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Problems solved by technology

[0011] The main purpose of the present invention is to provide a monitoring method, system and storage medium for the cooling efficiency of an exhaust gas recirculation system, aiming to solve the technical problems of complex or high-cost cooling efficiency detection methods in the prior art

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