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Research on Injector for Diesel Engines on Piezoelectric Ceramic

Author: PengZhang
Tutor: HuangTao
School: Wuhan University of Technology
Course: Communication and Information System
Keywords: Piezoelectric ceramic Displacement Injector Drive circuit PID controller
CLC: TK423.84
Type: Master's thesis
Year: 2010
Downloads: 225
Quote: 0
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Abstract


High speed rail system is the diesel fuel injection system trends. To meet the increasingly stringent engine emissions standards, precise control of the injector are becoming more widely used in diesel injection system. Piezoelectric actuators with conventional solenoid drivers compared in many ways has inherent advantages, diesel injector is ideal drive. In this thesis, the piezoelectric ceramic type injector research, has a very important significance. Papers in the use of home-made micro-displacement measurement tools to piezoelectric ceramic stack main properties of the samples tested in a large number of experimental data base up to understand the relationship between voltage and displacement, temperature change on the displacement effect, hysteresis and creep properties. These data demonstrate piezoelectric ceramic stack as diesel injector drive strengths and weaknesses, as later chapters drive circuit design and control algorithms choose to provide data basis. After reading a lot of literature about diesel injection system, the simulation of diesel injector work environment, the piezoelectric ceramic type injector drive road design. First simulation engine battery, stable design a 24V DC power supply for piezoelectric actuators to provide drive power; further reference PWM drive signal to drive the high-speed solenoid valve method also uses a PWM signal to drive the piezoelectric ceramic-type injector, This can save energy consumption and improve the response of the piezoelectric ceramic actuator performance; piezoelectric ceramic-type injector driver circuit composed of selected VMOS FET push-pull amplifier, to achieve the high-voltage signal to follow function, the voltage amplifier stage using the feedback comparator circuit, enabling undistorted linear voltage signal amplified piezoelectric actuators meet the driving power of the dynamic requirements. Finally, the piezoelectric ceramic injector control algorithm of the system, first with a relatively conventional PID control algorithm for control, but the test, that the control algorithm of this diesel injection system insufficient, this traditional The algorithm has been improved, and the use of a single neuron adaptive PID control algorithm. Study found that this control algorithm is applied to the piezoelectric ceramic type injector loop system so response time, control accuracy and adaptability has been greatly improved.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Diesel engine > Structure
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