Lubricating oil return mode of supercharger of turbocharged engine

Abstract

The invention relates to a lubricating oil return mode of a supercharger of a turbocharged engine, and aims to lubricate the supercharger. An oil return channel A which accords with the cold operating condition of an engine, an oil return channel B which accords with the normal operating condition of the engine, oil return channels C and D which accord with the operating condition of the engine in high temperature environment, and a supercharger oil return control valve are arranged on a cylinder body of the engine, so that oil return lines of lubricating oil in the supercharger of the engine in different operating states are cyclically switched. The operating efficiency of the engine is improved; the high temperature characteristic of the lubricating oil in the supercharger is reasonably utilized, so that the heat balance of the engine is realized; and meanwhile, the oil return performance of the supercharger of the engine is improved, the probability that the oil in the supercharger leaks is reduced, and the power performance and economy of the engine are effectively improved.

Description

technical field [0001] The invention relates to an oil return method for lubricating oil of a supercharger of a turbocharged engine for a vehicle, and belongs to the technical field of engines. Background technique [0002] With the increase of car ownership and the continuous improvement of automobile manufacturing technology, in order to meet the requirements of low energy consumption and high power of automobile engines and the increasingly stringent emission regulations, at present, turbocharging technology is widely used in car engines. Turbocharging The design of the turbocharger has become an important part of the engine research and development, and the research on the oil return of the turbocharger and the heat balance of each system of the engine has also become a key topic in this field. [0003] The general supercharger lubricating oil circulation method is: oil pan - oil pump - supercharger oil inlet pipeline - supercharger lubricating oil chamber - supercharger...

AI Technical Summary

Problems solved by technology

Since the engine adopts the same lubricating oil circulation mode under different working conditions, the oil absorption effect of the oil pump cannot be fully utilized, which is not conducive to the oil return of the supercharger, and it is easy to cause lubricating oil to leak to the compressor end and turbine end of the supercharger The problem of carbon deposits is formed, the life of the supercharger is reduced, and the consumption of engine oil increases, which restricts the improvement of engine power performance and economic performance

The specific performance is: when the engine is in a cold state, the high-temperature lubricating oil in the supercharger directly flows back to the oil pan, mixes with a large amount of lubricating oil in the oil pan, and then is pressurized by the oil pump to recirculate, resulting in a large heat loss. The temperature of the engine oil rises slowly, which is not conducive to shortening the warm-up time of the engine in a low temperature environment, and the working efficiency of the engine is low

When the engine is in a hot state, the high-temperature lubricating oil in the supercharger directly flows back to the oil pan, causing the temperature of the lubricating oil in the oil pan to rise, and the oil pressure of the lubricating oil to decrease, which is not conducive to the lubrication of moving parts and is easy to damage the engine. At the same time, it also has an adverse effect on the heat balance of the engine. The whole machine is in a high temperature state for a long time, which causes a large heat load on the engine parts and reduces the life of each part.

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