One-dimensional and three-dimensional joint simulation method for automobile engine cooling system

Abstract

The invention discloses a one-dimensional and three-dimensional joint simulation method for an automobile engine cooling system. The method comprises the steps of using three-dimensional simulation software for estimating the thermal power of a radiator, an intercooler and a condenser, taking constant values as the thermal power of the condenser, and then obtaining the outlet air volume of a radiator core, the outlet air volume of the intercooler core and the surface temperature average value of a core inlet; performing one-dimensional system simulation calculation by utilizing one-dimensionalsimulation software based on the air volume and the temperature average value to obtain the thermal power of the radiator and the intercooler; obtaining outlet air volumes of a radiator core, an intercooler core and a condenser core and a surface temperature average value of a core inlet by using three-dimensional simulation software according to the thermal power of the radiator, the intercoolerand the condenser; and repeatedly executing the steps to perform iterative computation until convergence conditions are met. The advantages of the one-dimensional simulation software and the advantages of the three-dimensional simulation software are fully utilized, simulation errors caused by heat reflux are reduced through repeated iteration, and the simulation precision of the water temperature of the cooling system is improved.

Description

technical field [0001] The invention belongs to the technical field of simulation of an automobile engine cooling system, and in particular relates to a one-dimensional and three-dimensional combined simulation method for an automobile engine cooling system. Background technique [0002] Automobile cooling system refers to the heat dissipation system with engine, condenser and intercooler as the main heat source, and also includes thermostat, water pump and pipeline. Cooling system simulation generally adopts two methods of one-dimensional simulation and three-dimensional simulation. One-dimensional simulation refers to the simulation at the system level, focusing on the matching between the various components of the cooling system. In the one-dimensional model, the various component models of the cooling system circuit are built, including the engine, radiator, condenser, intercooler, and thermostat. devices, heaters, pipelines, etc., such as figure 1 As shown, the connec...

AI Technical Summary

Problems solved by technology

When simulating the water temperature of the cooling system, the air volume and temperature on the air side are mostly input with empirical data or later test data, and there are the following problems: using empirical data as boundary input leads to large errors in water temperature simulation results; using bench test data as Input, in the early stage of the design, it is difficult to conduct simulation evaluation due to the inability to conduct tests, and the thermal power of the radiator and intercooler is different from that of the real vehicle, so it is difficult to guarantee the simulation accuracy

In addition, under low-speed conditions, or when the front-end cooling module is not tightly sealed in the early design of the model, the front-end module is easy to inhale the hot return air from the cabin, and it is difficult to quantitatively analyze the heat return only by the existing one-dimensional simulation. This in turn makes it impossible to accurately assess the water temperature of the cooling system

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