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Dynamic surface control of a piezoelectric fuel injector during rate shaping
Affiliation:1. State Key Laboratory of astronautic Dynamics, Xi''an Satellite Control Center, Xi''an, 710043 Shanxi, China;2. Department of Mathematics and System Science, College of Science, National University of Defense Technology, Changsha, 410073 Hunan, China;3. The State Key Laboratory for High Performance Computation, National University of Defense Technology, Changsha, 410073 Hunan, China;4. Science and Technology on Information Systems Engineering Laboratory, College of Information System and Management, National University of Defense Technology, Changsha, 410073 Hunan, China;1. Mechanical Engineering Department, Chaitanya Bharathi Institute of Technology, Gandipet, Hyderabad 500075, Andhra Pradesh, India;2. Mechanical Engineering Department, J.N.T.U. College of Engineering, Kukatpally, Hyderabad 500085, Andhra Pradesh, India;3. Jaya Prakash Narayan Educational Society Group of Institutions, Mahabubnagar 509001, Andhra Pradesh, India;1. Chongqing Nanfang Translators College of SISU, Chongqing 401120, China;2. Upper Changjiang River Bureau of Hydrological and Water Resources Survey, Chongqing 400014, China;1. School of Automotive Studies, Tongji University, Shanghai 201804, China;2. CDHK, Tongji University, Shanghai 201804, China
Abstract:Fuel injection rate shaping is a strategy to improve fuel efficiency and reduce harmful emissions in diesel engines. Due to their fast response, piezoelectric fuel injectors are capable of rate shaping operation. This paper describes a model-based closed-loop controller of injection flow rate for a piezoelectric fuel injector. This within-an-engine-cycle control strategy utilizes a dynamic surface control scheme and shows an injection flow rate tracking capability. Practical issues with LabVIEW FPGA control implementation are also addressed. The performance of the controller is verified with simulation and experimental results at different rail pressures and desired injection rates. The experiments show a maximum error of total fuel per one injection event of 2.5%. A stability analysis is also included.
Keywords:Fuel injector  Rate shaping  Piezoelectric  Hysteresis  Dynamic surface control  Nonsmooth system
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