Modelica language-based engine cooling system simulation modeling method

Abstract

The invention provides a Modelica language-based engine cooling system simulation modeling method. The method comprises a step of system decomposition in which the engine cooling system is decomposed into a part model library, wherein the part model library comprises an engine model, a cooler model, a thermostat model and a water pump model, and the thermostat model has delay and hysteresis features, a step of system modeling in which a mechanical system rotation interface model, a cooling liquid loop system interface model and an air end interface model are adopted to connect the engine model, the cooler model, the thermostat model and the water pump model to form a mechanical system, a cooling liquid loop system and an air end system, and a step of simulation control. Simulation of the engine cooling system model is well consistent with the actual engine cooling system.

Description

technical field [0001] The invention relates to the field of engine testing, in particular to an engine cooling system simulation modeling method based on Modelica language. Background technique [0002] The engine cooling system is an important part of the vehicle engine. It can ensure that the engine and transmission have the best thermal state under various ambient temperatures and operating conditions, so that the engine has good power and economy. It is a typical multi-field coupling system such as machinery, hydraulic pressure, and control. Therefore, reasonable and scientific multi-domain simulation modeling of the engine cooling system is of great significance. [0003] In the prior art, a heavy-duty vehicle diesel engine cooling system model was established based on MATLAB / SIMULINK, which focused on the fan's wind speed control logic, but did not model the thermostat delay and hysteresis in detail. Although this simulation model has good temperature prediction abi...

AI Technical Summary

Problems solved by technology

Although this simulation model has good temperature prediction ability, the prediction ability of the thermostat is relatively simple. The thermostat controls the coolant flow rate of each cycle in the cooling system.

The thermostat is modeled in a simplified form, which does not take into account delay and hysteresis, resulting in inaccurate simulation results, which adversely affects the design and improvement of the engine cooling system

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