Control method for fuel injection amount of methanol engine, electric control unit and vehicle

Abstract

The invention provides a control method for the fuel injection amount of a methanol engine, an electric control unit and a vehicle. The control method includes the steps that the target injection amount epsilon of fuel injectors is determined according to received input signals; calculation is carried out to obtain the injection pulse width alphaj of the fuel injectors under the injection pressuredifference Xi of the current fuel injector by using the following formula; according to the alphaj obtained through calculation, the injection pulse width of the fuel injectors is controlled; f(alphaj) is generated by fitting the relation of the injection pulse width alphaj of the multiple fuel injectors in the same model and corresponding injection pulse width correction coefficients; and g(Xi)is generated by fitting the relationship between the injection pressure difference Xi of the multiple fuel injectors in the same model and corresponding injection pressure difference correction coefficients. The control precision of the injection quantity is improved, the possibility of knocking of an air cylinder is reduced, and better play is given to the optimal performance of the methanol engine.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method for controlling fuel injection quantity of a methanol engine, an electronic control unit and a vehicle. Background technique [0002] With the rapid development of science and technology, automobiles have become an indispensable means of transportation in people's lives. With the increasing scarcity of petroleum resources and stricter vehicle emission regulations, the fuel requirements for vehicles are also becoming stricter. Methanol can be produced from coal and natural gas, its combustion speed is fast, it is smokeless, flameless, NO x Emissions are low, and methanol is easily transported relative to gaseous fuels such as natural gas. Therefore, considering the economy of use and reducing exhaust emissions, methanol is widely used as a fuel for vehicles as an alternative energy source. [0003] However, in the electronic control injection system, the injection ...

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Problems solved by technology

[0003] However, in the electronically controlled injection system, the injection quantity of the fuel injector is controlled by the electronic control unit (ECU, Electronic Control Unit), and the injection quantity correction coefficient suitable for methanol fuel is not used as the control parameter adopted by the electronic control unit. At the same time, Considering that there are differences between individuals of fuel injectors, it will affect the reliability of the engine and limit the best performance of the engine to a certain extent

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