Current research status of gasoline engine oil at home and abroad. To meet the needs of automobile emission performance, the technology to control automobile exhaust emissions can only control the emissions of gasoline engines within the scope of increasingly stringent regulations by combining in-flight purification and external purification. The external purification** is a three-way catalytic converter. It requires re-adjusting the formula of engine oil to control the phosphorus content, reduce catalyst poisoning, and extend the service life of the catalytic converter. To meet the needs of automobile fuel economy, in addition to improving the anti-friction properties of engine oils, low-viscosity grades of multi-grade oils should also be vigorously developed to improve energy-saving effects. But the viscosity is low, the engine oil consumption increases, the engine oil is easy to volatilize and cause abrasion. This requires the base oil to be light, and the evaporation loss is small, the high temperature and high shear viscosity cannot be too small, and the oxidation stability is better. Meet the need for longer and longer oil change periods.
In order to adapt to the improvement of thermal efficiency, specific power and other power performance, the main measures are to adopt gasoline engine fuel direct injection technology, and use computer to control air-fuel ratio, so that combustion is complete, emissions are improved, and the pulse boosting technology with high charging efficiency is also in electronically controlled direct injection gasoline engines. It can be applied to the gasoline engine, which unifies the power, emission and economy of the gasoline engine. However, this also increases the temperature of gasoline engine combustion chambers and other parts, and causes many problems such as high temperature deposition, high temperature oxidation resistance, high temperature detergency and high temperature wear. European gasoline cars have higher requirements for the quality of lubricating oil than American gasoline cars, forming a unified European social refueling minimum quality gasoline engine oil specification, which is suitable for various vehicles used in Europe. Automobile manufacturing companies can add some additional assessment items on this basis. A number of the company's assessment projects have formulated the company's ex-factory refueling and oil specifications, but the corporate standards must be higher than the European unified standards. Simulation performance test European countries have paid more attention to simulation performance test. The following test items are set in the standard: high temperature and high shear viscosity. Regarding the simulation performance test, only the -> grade oil specification began to pay attention, and the European standards have always paid more attention.
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