Modelica language-based engine cooling system simulation modeling method

A technology of engine cooling and system simulation, applied in the direction of internal combustion engine testing, etc., can solve problems such as failure to consider delay and hysteresis, inaccurate simulation results, design of engine cooling system, improvement of adverse effects, etc., and achieve the same effect of simulation modeling

Active Publication Date: 2015-11-18
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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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

Method used

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  • Modelica language-based engine cooling system simulation modeling method
  • Modelica language-based engine cooling system simulation modeling method
  • Modelica language-based engine cooling system simulation modeling method

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Embodiment Construction

[0024] refer to figure 1 , the black arrows in the figure indicate the direction of coolant flow, and the hollow arrows indicate the direction of cooling air flow. The water pump is the power source for the coolant circulation of the engine cooling system. The water pump is generally directly driven by the engine, and its speed is determined by the engine crankshaft. The thermostat is a control device for the circulating flow of coolant. A common thermostat controls the opening of the valve port through a wax ball to control the flow. When the thermostat is in a closed state, all the water flows through the bypass channel through the water pump. Back to the engine water jacket, that is, a small cycle; when the thermostat is opened, the coolant will be cooled by the radiator and then flow back to the engine water jacket through the water pump, that is, a large cycle. After the cooling air enters from the grille, it flows through the intercooler, oil cooler, radiator, fan and e...

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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...

Claims

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Application Information

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IPC IPC(8): G01M15/05
Inventor 陶其铭许志宝刘东峰祝文举张艳玲陈荣新
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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