Simulink-based modeling method of automobile engine

Abstract

The invention discloses an automobile engine modeling method based on simulink, and relates to the technical field of automobile engine simulation. The method comprises the steps that an engine output rotating speed calculation model, an engine output torque calculation model and an engine fuel consumption rate calculation model are established by analyzing an engine operation mechanism; particularly, when an engine output torque calculation model is established, the influence of the change of the concentration of mixed gas on the engine performance in the acceleration or deceleration process of the vehicle is analyzed, and the engine output torque calculation model considers the motion state of the vehicle; moreover, whether the engine is in a cold start state or a hot start state is considered when the engine fuel consumption rate model is established, and the fuel consumption rates are different in different engine states. The problem of inaccurate model calculation during cold start is solved, the working condition adaptability is improved, and the accuracy of the model is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile engine simulation, in particular to a modeling method of automobile engine based on simulink. Background technique [0002] The engine system is an important part of the vehicle. The engine is a mechanical device that can convert other forms of energy into mechanical energy. With the continuous improvement of the market and policy requirements for vehicle performance and the increasingly strict regulations on emissions and fuel economy, It makes the research of engine more and more important. The accuracy of engine modeling affects the evaluation of the power and fuel economy of the entire vehicle, so it is of great significance to carry out systematic and scientific modeling of the engine. At present, the modeling method of the engine is mostly the modeling method of universal characteristics, that is, the universal characteristics experimental data of the torque output of the engine at diffe...

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Problems solved by technology

At present, most of the engine modeling methods use the universal characteristic modeling method, that is, through the bench test, the universal characteristic experimental data of the engine torque output at different speeds is obtained, and the relationship between the throttle opening, speed and torque output is established. ; But for the state where the vehicle motion state changes, the mixture concentration changes, and the output torque of the engine has a certain increase or decrease

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