Cheng Chen

Research Field

Lithium-ion batteries (LiB) are widely used in electric vehicles (EVs) and battery energy storage systems, and accurate state estimation relying on the relationship between battery Open-Circuit-Voltage (OCV) and State-of-Charge (SOC) is the basis for their safe and efficient applications. To avoid the time-consuming lab test needed for obtaining OCV-SOC curves, this study proposes a data-driven universal method by using operation data collected onboard about the variation of OCV with ampere-hour (Ah). To guarantee high reliability, a series of constraints have been implemented. To verify the effectiveness of this method, the constructed OCV-SOC curves are used to estimate battery SOC and State-of-Health (SOH), which are compared with data from both lab tests and EV manufacturers. Results show that a higher accuracy can be achieved in the estimation of both SOC and SOH, for which the maximum deviations are less than 3.0% and 2.9% respectively.

State of charge

State of health

Open-circuit voltage

10.1016/j.geits.2022.100001

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Citations (98)

Nonlinear Disturbance Observer Based T-S Fuzzy Logic Control of Pneumatic Artificial Muscles

Cheng Chen Jian Huang Dongrui Wu

As a new type of actuator, pneumatic artificial muscle (PAM) possesses lots of superior characteristics, which make it extensively used in the robotics field, especially in rehabilitation engineering. But the complex dynamics such as time-varying parameters and hysteresis make it difficult to achieve high precision trajectory tracking control. In order to achieve accurate tracking performance and enhance the robustness of the controller, this paper proposes a nonlinear disturbance observer based T-S fuzzy logic controller (NDOTS). Based on the three-element model of PAM, T-S fuzzy modeling is utilized to decompose the nonlinear model into a series of linear models, which make it possible to use the linear system control theory in the controller design. The MATLAB LMI Toolbox is applied to get the feedback gains. A Lyapunov candidate is designed to analyze the stability of the system. The experimental results of attaching loads on the PAM validate the proposed NDOTS controller.

10.1109/icarm.2019.8834335

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Citations (2)

Application of evidence-based nursing combined with individualized health education intervention for patients undergoing gynecological surgery

Chinese Journal of Integrative Nursing (2023)

Ying Fan Hong Zhang Li LIU Qiao ZHEN Huiyun GAO

10.55111/j.issn2709-1961.202210006

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Citations (0)

Essays on the effectiveness of environmental and urban transportation policies

Cheng Chen

10.14288/1.0380426