Air-Fuel Ratio Fuzzy PID Control for Coal-Bed Gas Engine Based on Fuzzy PID Feedforward

Abstract:

In order to eliminate the adverse effects of coal-bed gas concentration disturbance to coal-bed gas engine air-fuel ratio control and the large pure time-delay existed in signal response of methane transducer, a fuzzy PID feedforward flow control plan was proposed for gas supply system. Fast and efficient flow control was performed in advance according to air-fuel ratio control requirements to eliminate air-fuel ratio control delays caused by the coal bed methane concentration disturbance. Based on the mentioned feedforward flow control plan, considering the premix coal-bed gas engine air-fuel ratio fluctuations arising from engine speed disturbances, a fuzzy PID closed-loop control scheme was proposed. By analyzing different air-fuel ratio control characteristics in transient condition and steady condition, the different closed-loop control of the air-fuel ratio was used to suppress air-fuel ratio fluctuations caused by engine condition changes. Compared to traditional PID control, the simulation results show that the air-fuel ratio fuzzy PID closed control scheme based on fuzzy PID feedforward flow control has ideal control effect, preferable stability and robustness. The air-fuel ratio control delays caused by the coal-bed methane concentration disturbance is well solved, and the problem of air-fuel ratio disturbance is well solved when the engines working condition changes, meeting the pre-mixed coal-bed gas engine air-fuel ratio control requirements.

• Periodical: Advanced Materials Research (Volumes 732-733)
• Pages: 800-808
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.732-733.800
• Online since: August 2013
• Authors: Jin Ju Shao*, Song Gao, De Rong Tan, Hai Tao Fang
• Keywords: Air-Fuel Ratio Control, Coal-Bed Gas Engine, Fuzzy PID, Gas Mixer, Large Time-Delay, Speed Disturbance

References

[1] Juan Yin, Yiwu Weng and Shi Su: submitted to Journal of Power Engineering (2009), in Chinese.

[2] Alvin. Yang. Coal-bed Methane: submitted to Environ Sci&Pollut Res (2005).

[3] Yuan Xia, Jianhua Liu, Xin Zhan, Xide Zhou: submitted to Automotive Engineering (2002), in Chinese.

[4] Shinji Nakagawa, Kouzou Katogi, in: A New Air-Fuel Ratio Feed Back Control for ULEV/SULEV Standard, SAE Paper, 2002-01-0194(2002).

DOI: 10.4271/2002-01-0194

[5] Gao Song, Lang Hua, Tan De-rong, et. al: submitted to Journal of System Simulation (2012), in Chinese.

[6] A. Chevalier, M. Muller, E. Hendricks, in: On the Validity of Mean Value Engine Models During Transient Operation, SAE Paper, 2000-01-1261(2000).

DOI: 10.4271/2000-01-1261