Fuel supply system of double-fuel automobile

Abstract

The invention aims to provide a fuel supply system of a double-fuel automobile, comprising a main fuel tank, an assistant fuel tank, a main fuel passage and an assistant fuel passage, wherein the mainfuel tank is communicated with a main fuel track in an engine by the main fuel passage; the assistant fuel tank is communicated with an assistant fuel track in the engine by the assistant fuel passage and the main fuel passage and the assistant fuel passage are both provided with filters for filtering fuel and pressure regulators for regulating the pressure of the fuel tanks. The fuel supply system is characterized in that the main fuel tank and the assistant fuel tank are both provided with gravity valves which are communicated with a carbon can by a three-way valve; the carbon can is communicated with a gas inlet branch pipe of the engine by an electromagnetic valve controlled by an ECU and the carbon can is also provided with an atmosphere port. The fuel supply system is used for supplying fuel to the engine by two fuel supply fuel passages, thereby solving the problem of difficult cold starting of methanol fuel; and the two fuel supply passages share the carbon can, thereby the cost is reduced on the premise of ensuring that the evaporation discharge of fuel oil is effectively controlled.

Description

technical field [0001] The invention relates to a fuel supply system for automobiles, in particular to a fuel supply system for dual-fuel automobiles with methanol as the main fuel and gasoline as the auxiliary fuel. Background technique [0002] With the increasing price of oil, dual-fuel vehicles with methanol as the main fuel are getting more and more attention and welcome. The fuel supply system of traditional single-fuel vehicles that use gasoline or diesel as fuel has been relatively perfect, but the fuel system of dual-fuel vehicles involves issues such as fuel switching, which has not yet been perfected, especially the control of evaporative emissions of fuel, which is related to the environment. The problem of pollution cannot be ignored. [0003] Such as figure 1 The evaporative emission control method of the fuel supply system of the single-fuel vehicle shown is as follows: the fuel tank communicates with the engine intake manifold through the activated carbon c...

AI Technical Summary

Problems solved by technology

The fuel supply system of traditional single-fuel vehicles that use gasoline or diesel as fuel has been relatively perfect, but the fuel system of dual-fuel vehicles involves issues such as fuel switching, which has not yet been perfected, especially the control of evaporative emissions of fuel, which is related to the environment. The problem of pollution cannot be ignored

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