Engine lubrication system suitable for hybrid vehicle and control method thereof

Abstract

The invention discloses an engine lubrication system suitable for a hybrid vehicle. The engine lubrication system comprises a control system, an actuating mechanism, an engine gear system, an electric motor and an oil pump. The two driving modes of the oil pump are engine gear system driving and electric motor driving which can be switched stably and freely under the effects of the control system and the actuating mechanism, thus working time of the oil pump and an engine have relative independence, it is ensured that the engine is in a good hydrodynamic lubrication status all the time under all operational states, failures such as cylinder scraping, supercharger journal sticking, half-bearing melting and shell scraping caused by poor lubrication are thoroughly eliminated, and meanwhile, free switching between the driving modes of the oil pump can completely eradicate over-use of storage battery energy.

Description

technical field [0001] The invention relates to automobile technology, in particular to hybrid vehicle technology, in particular to an engine lubricating system suitable for hybrid vehicles and a control method thereof. Background technique [0002] As the source of the lubrication system, the oil pump needs to continuously supply the engine with sufficient flow and pressure under various operating conditions. At present, the oil pump and engine in hybrid vehicles are generally driven by gears, and the work of the two has strict synchronization. During the actual operation of hybrid vehicles, the engine has high-frequency startup, rapid acceleration and emergency stop conditions. The faults of friction pairs such as cylinder scuffing, sliding tiles, supercharger shaft holding and shell friction caused by poor lubrication have become one of the most common failures in hybrid vehicles. Therefore, the present invention aims to propose a lubrication system suitable for hybrid ve...

AI Technical Summary

Problems solved by technology

[0004] 1) Dry friction when the engine starts: After the engine stops, the lubricating oil in the engine oil chamber leaks to the oil pan through the gaps. Lack of oil, the proportion of dry friction increases, and the friction wears intensified

[0005] 2) Lag in the establishment of oil pressure in rapid acceleration conditions: For the rapid acceleration conditions that are common in hybrid vehicles, since it takes time for the lubricating oil to flow, the oil pressure can generally be established after a period of time when the engine speed increases. Relatively insufficient, poor engine lubrication

[0006] 3) The oil pressure drops rapidly under the emergency stop condition: after the engine stops suddenly, because the oil pump stops working, the pressure of the lubricating oil will drop rapidly, but the heat of the friction pair is not completely taken away by the oil, and the impeller of the supercharger is still under the action of inertia. In high-speed rotation, due to lack of oil, the friction pair faults such as engine cylinder pulling, chemical tiles, turbocharger shaft holding and shell friction, etc.

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