Abstract
The condition of the motor oil in civilian cars is difficult to monitor; hence, we propose a method to evaluate the degree of degradation of motor oil using an on-board diagnostic (OBD) system. Three civilian cars and four motor oils (containing mineral oils and synthetic oils) were subjected to five groups of road tests under urban traffic and high-way conditions. The operation information, oil service time, mileage, engine operation time, idle time of the engine, and number of start-ups of the engine were obtained using the proposed OBD system. Physiochemical properties and changes in the components of motor oils during road tests were analyzed in laboratory. The theoretical model of the comprehensive indicators of driving parameters and oil properties were established. The proposed method was successfully applied to different cars, motor oils, and operating conditions in road tests. All the theoretical models had high accuracy and precision. Herein, we provide a method to monitor the oil condition with real-time driving parameters and provide a reference for end users to change their motor oil reasonably.
Highlights
Motor oil is an essential part of fuel-based vehicles
This study was based on 41 oil samples in three experimental cars during the 575 days of road tests
The conclusions were as follow: 1) A method was proposed to establish the theoretical models of the comprehensive change characteristics of the driving parameters and oil properties
Summary
Motor oil is an essential part of fuel-based vehicles. It provides wear protection, thermal management, and corrosion inhibition functions that are crucial for operation of the vehicle [1−3]. Determine the properties of oil; the long testing time and high cost limits its application [12−15] Another more widely used method to change motor oil is based on the mileage or service time recommended by the original equipment manufacturers (OEM). A method to establish the theoretical model of operation parameters and oil properties based on road tests in urban traffic and high-way conditions was proposed. This can be used to predict oil degradation in real-time based on the operation parameters of cars This method can reduce the testing time and increase the accuracy for evaluating the oil change interval compared to the traditional laboratory oil analysis and stipulated operation mileage or service time, which helps change motor oil more economically and effectively
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