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Analysis of a Coordinated Engine-Start Control Strategy for P2 Hybrid Electric Vehicle

Tianjin University-Chen Zhao, Bingfeng Zu, Yuliang Xu, Zhen Wang, Lina Liu, Jianwei Zhou
Weichai Power Co Ltd-Guangxing Zhao
Published 2019-11-04 by SAE International in United States
P2 hybrid electric vehicle is the single-motor parallel configuration integrating with an engine disconnect clutch (EDC) between the engine and the motor. The key point with P2 hybrid electric vehicle is to start the engine utilizing the single driving motor while still propelling the vehicle, which requires an appropriate engine-start control strategy and a high mechanical performance of EDC. Since the space for EDC is limited, EDC torque response is difficult to follow the torque command, which complicates the issue of precisely controlling the clutch. Consequently, methods proposed in massive papers are inappropriate for current EDC of target vehicle. Considering that slip control of shifting clutch also contributes to reducing impact of engine start assisted by EDC, a detailed engine-start control strategy was proposed to simplify the control of EDC for being applied to actual target vehicle. Furthermore, the control strategy proposed in this paper was utilized to realize driving mode transformation from motor-only to engine-only. In this paper, a detailed hybrid electric vehicle simulation model was established with the consideration of dynamic characteristics of…
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Study on Methods of Coupling Numerical Simulation of Conjugate Heat Transfer and In-Cylinder Combustion Process in GDI Engine

Chongqing Changan Automobile Co., Ltd.-Zhang Song Zhan, Qi-yi Guo, Bin Liu, Tie Gang Hu
Tianjin University-Minyue Wu, Yiqiang Pei, Jing Qin, Xiang Li, Jianwei Zhou
Published 2017-03-28 by SAE International in United States
Wall temperature in GDI engine is influenced by both water jacket and gas heat source. In turn, wall temperature affects evaporation and mixing characteristics of impingement spray as well as combustion process and emissions. Therefore, in order to accurately simulate combustion process, accurate wall temperature is essential, which can be obtained by conjugate heat transfer (CHT) and piston heat transfer (PHT) models based on mapping combustion results. This CHT model considers temporal interaction between solid parts and cooling water. This paper presents an integrated methodology to reliably predict in-cylinder combustion process and temperature field of a 2.0L GDI engine which includes engine head/block/gasket and water jacket components. A two-way coupling numerical procedure on the basis of this integrated methodology is as follows. With SAGE detailed chemical kinetics model, 3D CFD was applied to simulate the in-cylinder combustion and predict emissions with transient pressure and temperature boundary conditions from 1D simulation model to obtain gas side time-averaged HTC and temperature distribution of combustion system walls. These thermal boundary conditions were mapped to CHT model and piston…
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An Investigation of Abnormal Spray Behaviors of Multi-Hole GDI Injector

Chongqing Changan Automobile Co., Ltd.-Zhang Song Zhan, Xuesong Wu, Tie Gang Hu, Xueying Su, Chaojun Zhang, Tangming Chen
Tianjin Agricultural University-Li Wang
Published 2016-04-05 by SAE International in United States
The main objective of this paper is to investigate the influence of injection pressures and fuel temperatures on the secondary injection spray evolution at the end of injection from a multi-hole gasoline direct injection (GDI) injector by Mie-scattering technique.The results of this paper show that the overall injection process can be classified into five stages which are injection delay stage, main injection stage, dwell stage, secondary injection stage and ligaments breakup stage respectively. Especially, the secondary injection occurs at the end of main injection, which is abnormal and undesirable spray behaviors. During the injection, big droplets and ligaments are injected through nozzle orifices at low speed.As the injection pressure increases, the phase of the secondary injection advances, and the injection duration decreases. At medium injection pressures (at 6, 8 MPa), more quantity of fuel are injected as ligaments. At higher injection pressures (above 10 MPa), more droplet clusters can be produced. The secondary injection spray tip penetration is lower than that of main injection. The average increment of penetration in one time step is small.…
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