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

A technology of mixed gas temperature and engine cylinder, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of short mixing time, oil dilution, no actual sensor monitoring, etc., and achieve the best performance effect

Active Publication Date: 2020-11-03
DONGFENG MOTOR CORP HUBEI
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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 environme

Method used

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Embodiment Construction

[0013] The present invention will be further described in detail below in conjunction with specific examples.

[0014] This embodiment is used to estimate the temperature T of the mixture gas in the engine cylinder. Taking this temperature as input, when the controller performs fuel injection timing and ignition angle control, at the same operating point, when the temperature of the mixture gas rises, the mixture gas is mixed The speed is fast, and the fuel injection timing can be delayed appropriately to avoid oil dilution caused by fuel injection until the piston flows into the oil pan; at the same time, the ignition angle is correspondingly delayed to achieve the best ignition timing. The ignition bias correction control table corresponding to the air temperature is realized to make the engine run at the best performance.

[0015] Factors that affect the temperature of the mixture in the engine cylinder include engine water temperature, intake air temperature, air-fuel rati...

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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...

Claims

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Application Information

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IPC IPC(8): F02B77/08
CPCF02B77/085
Inventor 陈龙肖文涛潘洪健马滔王功健
Owner DONGFENG MOTOR CORP HUBEI
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