Method for estimating temperature of in-cylinder mixed gas of engine

Abstract

The invention relates to the technical field of automobile control, in particular to a method for estimating the temperature of in-cylinder mixed gas of an engine. The in-cylinder mixed gas basic temperature T1 is collected, correction deviation values of all elements influencing the in-cylinder mixed gas temperature are obtained, and the in-cylinder mixed gas temperature T of the engine can be obtained by superposing the in-cylinder mixed gas basic temperature T1 and the correction deviation values of all the elements. According to the method, the correction deviation values of all elements influencing the temperature of the mixed gas in the engine are obtained in a calibration manner, in the actual use process, an actual temperature value of the mixed gas in the engine can be estimated only by superposing the correction deviation values with the standard mixed gas temperature, and the actual temperature value serves as a reference; and a controller can accurately control the runningcondition of the engine, so that the engine achieves the optimal performance.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a method for estimating the temperature of mixture gas in an engine cylinder. Background technique [0002] For gasoline engines, the formation of mixture gas is the key factor for good or bad combustion. Under the premise of engine hardware including intake and exhaust system, VVT setting and EGR valve opening, cylinder temperature is the key factor affecting the formation of mixture gas. , especially for direct injection gasoline engines, due to the short time for fuel injection to complete mixing in the cylinder, it is more affected by the temperature environment in the cylinder, and the resulting unreasonable mixture control strategy will lead to a series of problems such as emission deterioration and oil dilution , but there is no actual sensor to monitor the combustion chamber temperature. At present, the common one is based on the engine water temperature contro...

AI Technical Summary

Problems solved by technology

[0002] For gasoline engines, the formation of mixture gas is the key factor for good or bad combustion. Under the premise of engine hardware including intake and exhaust system, VVT setting and EGR valve opening, cylinder temperature is the key factor affecting the formation of mixture gas. , especially for direct injection gasoline engines, due to the short time for fuel injection to complete mixing in the cylinder, it is more affected by the temperature environment in the cylinder, and the resulting unreasonable mixture control strategy will lead to a series of problems such as emission deterioration and oil dilution , but there is no actual sensor to monitor the combustion chamber temperature. Currently, the common one is based on the engine water temperature control, which cannot truly reflect the temperature state of the combustion chamber, resulting in the failure to achieve optimal control of the combustion parameters.