Natural gas and hydrogen double-injection device and control method utilizing same

Abstract

The invention discloses a natural gas and hydrogen double-injection device. The natural gas and hydrogen double-injection device is characterized in that a natural gas supply system comprises a high-pressure natural gas bottle, a first electromagnetic valve, a first pressure reduction regulator and a natural gas rail nozzle body which are connected through a pipeline; a hydrogen gas supply system comprises a high-pressure hydrogen cylinder, a second electromagnetic valve, a second pressure reduction regulator and a hydrogen gas rail nozzle body which are connected through a pipeline, the natural gas rail nozzle body and the hydrogen gas rail nozzle body are each composed of a gas rail and a plurality of nozzles, and the nozzles correspond to gas inlet branch pipes of an engine in number and position; and a control system comprises a controller, an electronic throttle valve, a gas inlet pressure and temperature sensor, a rotating speed sensor, a cam shaft position sensor, a water temperature sensor, an oxygen sensor, the first electromagnetic valve, the second electromagnetic valve, the natural gas rail nozzle body and the hydrogen gas rail nozzle body. The invention further provides a control method utilizing the device. The performance of the engine can be improved, and pollutant emission is reduced.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a natural gas hydrogen double injection device and a control method thereof. Background technique [0002] my country is rich in natural gas resources, the main component of which is methane CH 4 . Compared with gasoline and diesel, the ratio of hydrogen atoms to carbon atoms in methane molecules is large (4:1), that is, methane fuel contains more hydrogen and less carbon, and generates more water H after combustion 2 O, less carbon dioxide CO 2 . At the same time, because methane is a gas, it is easy to mix with air in the engine, and the combustion is relatively complete, and the number of particulate matter PN and the amount of particulate matter PM in the exhaust gas are relatively small. Therefore, natural gas vehicles are called clean fuel vehicles, which are the types of vehicles promoted by the state. However, natural gas vehicles also have shortcomings. F...

AI Technical Summary

Problems solved by technology

However, natural gas vehicles also have shortcomings. First, the combustion speed of natural gas is slow, which makes the thermal efficiency of the engine not high. Second, the unburned methane in the exhaust gas is not easy to catalyze, which requires higher requirements for three-way catalytic converters, and more Precious metals (such as platinum Pt and palladium Pd)

[0003] carbon dioxide CO 2 Increased emissions will cause atmospheric temperatures to rise, with disastrous consequences for the global ecology

The first mixing method of natural gas and hydrogen can only correspond to a fixed ratio of natural gas and hydrogen

The second method of mixing natural gas and hydrogen requires the use of two flowmeters, and requires manual or automatic control (need to increase the control mechanism), which is only suitable for use in laboratories or fixed places, not suitable for use on natural gas vehicles

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