Flexible fuel engine control system and control method

Abstract

The invention discloses a system for controlling flexible fuels, which comprises an oil injector, an oil rail and a main oil supply system, and an auxiliary oil supply system as well as a cleaning system, wherein the auxiliary oil supply system is used for cold starting, and the cleaning system comprises an oil return pipe for connecting the oil rail and a main oil tank, and an electromagnetic valve controlled by an engine controller. When the engine controller judges that gasoline is needed to assist the cold starting, the electromagnetic valve is controlled to turn on, an auxiliary pipe pump is controlled to operate, and alcohol fuels in the oil rail is cleaned to the main oil tank by the gasoline in an auxiliary oil tank. After an oil path is cleaned completely, the engine controller controls the electromagnetic valve to turn off, the engine is started to enter the cold starting mode, and after the cold starting is ended, the engine is automatically switched into the alcohol fuel mode of the main oil tank to operate. The invention can realize that two fuels, namely the alcohol fuels and the gasoline share one oil rail to normally operate by using the control system, and solve the problem of difficult startup of the alcohol fuels at a low temperature at the same time. Compared with the prior control system, the system improves integral performance of the engine.

Description

technical field [0001] The invention belongs to a flexible fuel control system, and particularly relates to a flexible fuel vehicle control strategy and an entire vehicle fuel supply system. Background technique [0002] At present, alcohol gasoline dual-fuel engines mostly use a gasoline-assisted starting device based on the original gasoline engine. Specifically, an oil supply system is added on the basis of the original oil supply system, and the two oil supply systems are independent of each other. The newly added fuel supply system is mainly for gasoline to solve the problem of difficult cold start of the engine at low temperature. Some engines add a fuel injector on the intake manifold to simulate a carburetor to assist in cold starting; some engines add a fuel rail injector assembly to the intake manifold for cold starting fuel rails to assist cold starting . Two sets of oil rails are arranged on one intake manifold, and one set of oil supply system is added to the...

AI Technical Summary

Problems solved by technology

Arranging two sets of oil rails on one intake manifold, and adding a set of oil supply system to the whole vehicle requires redevelopment of the engine body and the parts of the whole vehicle. The product involves many parts to be developed, the cycle is long, and the cost is high. The air manifold change changes the intake port of the engine, which reduces the overall performance of the engine to a certain extent

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