Analysis and Design Validation of Medium Duty Truck Cooling System

Saha, Rohit; Kumar, Manoj; Hwang, Long-Kung; Wang, Xingshi; Zhang, Fengchao; Zhang, Xiaodan; Yagui, Liu; Sun, Weiqing; Wang, Yan; Wei, Cheng; Lin, Mingjin

doi:10.4271/2016-01-8073

Cited by 1 publication

(1 citation statement)

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“…In the process of aerodynamic coupling thermal transmission in the CFD model of engine compartment, the only fluid medium is the air. In addition, the liquid-side convection heat exchange capability of heat exchangers was described in the cooling system mathematical model [38]. The volume thermal generation load in each heat exchanger was defined, such that the convection heat transfer coefficient was deemed uniform and the surface weighted average temperature was used as the observation of the thermal transmission boundary, thus ignoring the inconsistencies on the windward surfaces [39].…”

Section: Underhood Cfd Simulationmentioning

confidence: 99%

Numerical Calculation Method of Model Predictive Control for Integrated Vehicle Thermal Management Based on Underhood Coupling Thermal Transmission

Gao

Liu

et al. 2019

Energies

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The nonlinear model predictive control (NMPC) controller is designed for an engine cooling system and aims to control the pump speed and fan speed according to the thermal load, vehicle speed, and ambient temperature in real time with respect to the coolant temperature and comprehensive energy consumption of the system, which serve as the targets. The system control model is connected to the underhood computational fluid dynamics (CFD) model by the coupling thermal transmission equation. For the intricate thermal management process predictive control and system control performance analysis, a coupling multi-thermodynamic system nonlinear model for integrated vehicle thermal management was established. The concept of coupling factor was proposed to provide the boundary conditions considering the thermal transmission interaction of multiple heat exchangers for the radiator module. Using the coupling factor, the thermal flow influence of the structural characteristics in the engine compartment was described with the lumped parameter method, thereby simplifying the space geometric feature numerical calculation. In this way, the coupling between the multiple thermodynamic systems mathematical model and multidimensional nonlinear CFD model was realized, thereby achieving the simulation and analysis of the integrated thermal management multilevel cooperative control process based on the underhood structure design. The research results indicated an excellent capability of the method for integrated control analysis, which contributed to solving the design, analysis, and optimization problems for vehicle thermal management. Compared to the traditional engine cooling mode, the NMPC thermal management scheme clearly behaved the better temperature controlling effects and the lower system energy consumption. The controller could further improve efficiency with reasonable coordination of the convective thermal transfer intensity between the liquid and air sides. In addition, the thermal transfer structures in the engine compartment could also be optimized.

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Section: Underhood Cfd Simulationmentioning

confidence: 99%