Displacement model and driving voltage optimization for a giant magnetostrictive actuator used on a high-pressure common-rail injector. (5th April 2016)

• Record Type: Journal Article
• Authors: Xue, Guangming; Zhang, Peilin; He, Zhongbo; Li, Dongwei; Yang, Zhaoshu; Zhao, Zhenglong
• Is Part Of: Materials & design. Volume 95(2016)
• Page Start: 501
• Page End: 509
• Publication Date: 2016-04-05
• Subjects: Giant magnetostrictive actuator -- Equivalent circuit -- Displacement model -- Driving voltage -- Optimization; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.01.139
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: A novel giant magnetostrictive actuator driving the ball-valve of a high-pressure common-rail injector was designed in this paper. With the help of a special output rod, elongation of the giant magnetostrictive rod was converted to shortening of the actuator. So the actuator could suitable to a normally-closed injector. The traditional series equivalent circuit of the coil in the actuator was modified, and then the displacement model of the actuator was established and solved by a numerical method. The voltage, coil current and displacement of the actuator were acquired by a dedicated measuring system. Then the model was validated under the input voltages using sinusoid, AC square and DC square waveforms. A new driving voltage waveform suitable to the actuator was designed. And then the designed voltage was optimized for short responding time and slight fluctuation of the actuator displacement. The residual displacement caused by the hysteresis of giant magnetostrictive material was also considered. Graphical abstract: Highlights: Giant magnetostrictive rod's elongation can be converted into shorting length of the actuator using a novel output rod. Equivalent circuit with parallel resistance is effective in predicting actuator's impedance and transient-state response. Inputting high-voltage to increase displacement and maintaining low-voltage can promote responding speed of the actuator. Duration time of high-voltage in designed voltage waveform is better to be set as short as possible to reduce fluctuation.