Method, device and vehicle for prediction and control of engine lubricating oil water content

CN122407334APending Publication Date: 2026-07-17CHONGQING CHANGAN AUTOMOBILE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING CHANGAN AUTOMOBILE CO LTD
Filing Date
2026-05-22
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing technology, the lubricating oil moisture prediction model fails to effectively consider the differences in wall temperature in different parts of the crankcase and the effects of leakage and scavenging on the condensation rate, resulting in low accuracy in estimating the increase in moisture.

Method used

By acquiring engine operating data, the leakage and scavenging volume are determined, the water vapor density of the moist air is calculated, and the condensation and evaporation rates are calculated using mass transfer theory in conjunction with multi-region wall temperatures. The water content of the lubricating oil is obtained by integration, and the accuracy is improved by using multi-region modeling and mass transfer formulas.

Benefits of technology

It significantly improves the accuracy of lubricating oil moisture prediction, can reflect the condensation phenomenon in different parts of the engine in real time, reduces prediction deviation, and achieves precise control of lubricating oil moisture.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the technical field of engines, for example to a method and device for predicting and controlling water content in engine lubricating oil and a vehicle. The prediction method comprises the following steps: determining the amount of blow-by gas and the amount of scavenging gas entering the crankcase based on the operation data of the engine; determining the water vapor mass flow carried by the blow-by gas according to the fuel characteristics; determining the water vapor density of the wet air in the crankcase based on the water vapor mass flow and the amount of scavenging gas; obtaining the wall surface temperature of a target area in the crankcase; determining the condensation rate according to the wall surface temperature and the water vapor density; obtaining the lubricating oil temperature and determining the water evaporation rate according to the lubricating oil temperature and the water vapor density; and obtaining the water content in the lubricating oil according to the condensation rate and the water evaporation rate. The present application quantifies the water discharge path through the amount of scavenging gas and the evaporation rate, continuously tracks the net accumulation amount of water, and significantly improves the estimation accuracy of the total condensation amount.
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