Fuel control system and control method for alcohols and gasoline dual fuel engine

The invention discloses a fuel control system for alcohol and gasoline dual-fuel engine and a control method. The control system comprises a main fuel supply system and an auxiliary fuel supply system. The main fuel supply system comprises a main fuel tank, a main oil pump, a main fuel pipeline, a fuel rail and a fuel injector which are communicated in order. The auxiliary fuel supply system comprises an auxiliary fuel tank, an auxiliary oil pump, an auxiliary fuel pipeline and the fuel rail and the fuel injector shared with the main fuel supply system which are communicated in order. The control method adopts an automobile ECU to automatically switch the main fuel supply system and the auxiliary fuel supply system of the control system so as to complete the automatic control to the fuel of alcohol and gasoline dual-fuel engine. The invention solves the problem of difficult cold start for alcohol engine, has no change compared with original gasoline engine when gasoline is used as fuel, and maintains the stability of the structure of the original engine.