Dual-fuel automobile fuel feed control method and system

Abstract

The invention discloses a dual-fuel automobile fuel feed control method and system and belongs to the technical field of vehicle control. The method includes the steps that when an engine is in a gas combustion state, an electronic control unit detects the working condition of a pressure sensor; when the pressure sensor works normally, the electronic control unit receives a pressure signal input by the pressure sensor, wherein the pressure signal is used for representing the value of pressure in a fuel gas cylinder; when the time in which the value of the pressure in the fuel gas cylinder is continuously smaller or equal to a preset pressure valve is longer than or equal to a preset duration, the engine is controlled through the electronic control unit to be switched to an oil combustion state. According to the method, fuel switching control can be achieved accurately according to the allowance of gas in the fuel gas cylinder so that frequent oil and gas switching caused by signal fluctuation occurring when high pressure of the gas cylinder gets close to and quits a boundary point can be avoided.

Description

technical field [0001] The invention relates to the technical field of vehicle control, in particular to a dual-fuel vehicle fuel supply control method and control system. Background technique [0002] Compressed natural gas (English: Compressed Natural Gas, referred to as: CNG) is a clean energy source. Compared with gasoline fuel, the exhaust emission level of new energy vehicles using natural gas as fuel has been greatly reduced. Moreover, natural gas enters the engine in a gaseous state, and can be evenly mixed with air in the engine, and the combustion is relatively complete, so the thermal cycle efficiency can be improved, the combustion speed can be accelerated, and the combustion heat energy can be fully utilized; at the same time, the octane number of CNG is higher than that of gasoline, and its resistance Explosiveness is relatively high; in addition, the price of natural gas is relatively cheap and stable compared with gasoline prices. To sum up, gasoline-CNG dua...

AI Technical Summary

Problems solved by technology

When this signal is used as an exit judgment condition, a single-value form is often used for comparison and judgment. Since the measurement accuracy of the high-pressure pressure sensor is reduced when the gas pressure is low, the fluctuation of the voltage signal will cause the output pressure signal to fluctuate. The ECU automatically performs oil-gas switching only by identifying whether the high-pressure signal meets the requirements of CNG combustion. The fluctuation of the high-pressure signal is very likely to cause frequent oil-gas switching when the engine is about to exit the CNG mode limit, which not only seriously affects the The user's driving experience also brings hidden dangers to safe driving

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