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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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Influence of Methanol Gasoline Blend Fuel on Engine and Catalyst Performance

State Key Laboratory of Automotive Safety and Energy, Tsinghua University-Fan Zhang, Shijin Shuai, Jianxin Wang, Zhen Wang
Published 2009-04-20 by SAE International in United States
According to China's “oil-poor, gas-litte, coal-rich” structure of energy resources, to promote the development of coal-based methanol fuel as a clean alternative to gasoline and diesel fuel is one of the most realistic options. So the adaptability of methanol gasoline blend fuel used in the gasoline engine and vehilce should be investigated.Engine load performance, engine out emission, air fuel ratio variation and combustion characteristics were tested in a PFI Euro III gasoline engine using gasoline, M10, M15, M20, M30 as fuel without any modification of the engine. Air fuel ratio, light-off temperature and load characteristics of catalystic conversion coefficient were also investigated. And effects of methanol content on fuel consumption and vehicle out emissions of a Euro - vehicle are analyzed. Test results showed that low blend ratio methanol gasoline blend fuel could adapt to current engines and vehicles, and even has less THC, CO emissions and fuel consumption compared with fueling pure gasoline.
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Characteristics of MEA Degradation Caused by Startup and Shutdown Operation of PEFC

Musashi Institute of Technology-Yasuo Takagi, Shigenori Okuzono, Yuichi Sato, Zhen Wang
  • Technical Paper
  • 2007-08-0350
Published 2007-05-23 by Society of Automotive Engineers of Japan in Japan
The objective of this research is to characterize the performance degradation attributable to the shutdown operations of polymer electrolyte fuel cells and to explore possible methods of reducing such degradation. As a result, it was made clear that a sequence of shutting off the air supply prior to stopping the hydrogen supply was effective in mitigating such performance degradation. Diagnostic technology revealed that the performance degradation was mainly observed at the cathode catalyst and that it was caused by so-called reversal current, which was triggered by air that crossed leaked from the cathode to the anode.