Control system of methanol/natural gas flexible fuel engine and control method of control system of methanol/natural gas flexible fuel engine

Abstract

The invention discloses a control system of methanol / natural gas flexible fuel engine and a control method of the control system of the methanol / natural gas flexible fuel engine. The control system comprises a methanol oil supply injection system, a natural gas supply injection system and a methanol / natural gas flexible fuel electric control system, wherein the electric control system comprises asensor, an actuator and an ECU, the control system controls the methanol amount through a methanol fuel injector, a fuel gas nozzle controls the fuel gas amount, an electronic throttle valve body controls the air inlet air amount, a wide-area oxygen sensor controls the air-fuel ratio of engine operation through detection and closed-loop feedback; the control method can enable the engine to operatein a pure methanol working mode, a pure natural gas working mode and a methanol / fuel gas dual-fuel working mode and controls to accurately control the methanol injection amount and the natural gas injection amount according to different working states of the engine, the injection time and the injection duration, the air inlet air volume and the air-fuel ratio of the gas fuel can be controlled, sothat the safe and stable operation of the engine is ensured, the fuel consumption is reduced, and the emission of the tail gas is reduced.

Description

technical field [0001] The invention belongs to the technical field of engine control, and in particular relates to a control system and a control method for a methanol / natural gas flexible fuel engine. Background technique [0002] Energy shortage and environmental problems have become common problems faced by countries all over the world. It has become an inevitable development trend for the automobile industry, which consumes a lot of energy and pollutes heavily, to seek new alternative energy sources. Methanol and natural gas are new alternative fuels for automobiles in the prior art. Pure methanol and natural gas instead of gasoline or diesel oil have been used in internal combustion engines to a certain extent. These two alternative fuels are more environmentally friendly than gasoline and diesel oil. It also has the advantage of being cheaper than gasoline and diesel. [0003] At present, the engine can use pure methanol as fuel (referred to as M100), or methanol an...

AI Technical Summary

Problems solved by technology

The problems when using pure methanol as fuel are: 1. The latent heat of vaporization of methanol is large, which makes it difficult to start the engine cold. Therefore, the current methanol engine usually uses gasoline to start when the temperature is low. Switch to methanol working mode after high temperature

2. At present, the supply chain of methanol is not perfect enough, and there are still some problems in the filling of methanol fuel. Therefore, vehicles powered by methanol engines cannot run for a long time in areas without methanol supply, and the use area of ​​vehicles is restricted limit

However, the current supply chain of natural gas is not perfect, and there are still some problems in the filling of natural gas fuel in many areas, especially in winter due to the shortage of natural gas supply for vehicles due to heating consumption

Therefore, a car powered by a natural gas engine cannot run for a long time in an area without natural gas supply, and the use area of ​​the car is also limited.

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