The injection process occurs extremely fast and because the actuator can be activated and deactivated so quickly, piezo injectors are known for their superior reliability, increased durability, efficiency and reduced emissions. When the Piezo actuator is de-energized, the valve closes and high pressure fuel forces the needle to return to the closed position. The injector was accurately modelled in its three subsystems, namely the piezo actuator, the thermal compensator and the valve body, in order to have a complete control on its behaviour. ![]() E-mail address: baitimerovrmsusu.ac.ru 2015 The Authors. ![]() This paper is devoted to modeling of common rail piezo injector from Bosch. With no pressure at the top of the needle, it springs open, allowing fuel to be injected into the combustion chamber. Now, one of the most perfect of FIS is common rail fuel injection system with piezoelectric indirect-acting injector. When the Piezo crystal is energized, a valve at the top of the needle opens, allowing the pressurized fuel at the top of the needle to return to the tank through the return line. E-mail address: baitimerovrmsusu.ac.ru © 2015 The Authors. Piezo electric fuel injector process diagram (via Diesel Hub) Inside each piezo injector body is a stack of hundreds of thin wafers of piezo-electric material, all of which expand slightly when electrical current is applied (at over 100 volts via step-up transformers inside the DME engine control unit). Now, one of the most perfect of FIS is common rail fuel injection system with piezoelectric indirect-acting injector. Located in the top portion of the injector body is the piezoelectric actuator, which. The injectors are made up of four primary sections: the piezoelectric actuator, the hydraulic coupler, the control valve and the injector nozzle. ![]() Pressurized fuel is also delivered to the top of this needle, the force of which keeps the needle closed. The injectors can generate a considerably finer atomized fuel spray at injection pressures greater than 23,000 psi. In a piezo injector, the electronic engine management system sends an electrical signal to the valve, much like the solenoid operated valve. High pressure fuel is delivered to the tip of the injector where a needle rests and blocks fuel from being injected. A piezo injector can act up to five times faster than a standard injector solenoid and the motion is frictionless, which allows for precise fuel measurement and multiple injector events per combustion cycle. It rapidly expands when electricity is applied, making it suitable to act as the actuator in a diesel fuel injector. You can test Piezo injectors for flow and spray and electronic operation on the ASNU machine but we also recommend testing the insulation and the condition o. Piezo injectors are crucial in modern common rail diesel engines, instigating a rapid series of injection events which allow for greater efficiency, performance & reduced emissions.Īt the heart of a piezo injector is the piezoelectric (piezo) crystal.
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