Electronically controlled high-pressure common rail injector with piezoelectric actuator

Abstract

The invention relates to an electric control high-voltage common rail fuel injector with a piezoelectric executive component, in particular to a fuel injector applied to a low-emission compression ignition engine common rail fuel injection system. The electric control high-voltage common rail fuel injector with the piezoelectric executive component comprises a piezoelectric executive component shell, the piezoelectric executive component, an upper shell, a conveying rod, a valve base, a middle shell, a control piston, an ejector rod, a fuel nozzle nut, a fuel spraying nozzle and a fuel nozzle pin valve. The piezoelectric executive component is located in the piezoelectric executive component shell, and the piezoelectric executive component shell is located in the upper shell. The piezoelectric executive component comprises a plurality of piezoelectric pieces, internal electrodes and external electrodes, each piezoelectric piece is arranged in the vertical direction, and the piezoelectric pieces are connected in a stacked mode in sequence in the horizontal direction. According to the electric control high-voltage common rail fuel injector with the piezoelectric executive component, the number of laminated piece layers during machining of the piezoelectric executive component is reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to an electronically controlled high-pressure common-rail fuel injector with a piezoelectric actuator, in particular to a fuel injector suitable for a common-rail fuel injection system of a low-emission compression-ignition engine (diesel engine) for vehicles. Background technique [0002] Due to the country's emphasis on environmental protection, emission regulations have become more and more stringent, requiring existing internal combustion engines to reduce emissions of nitrogen oxides and particles. Among various measures to reduce emissions, reducing the emissions of air / fuel mixture during combustion is the most fundamental way. The amount of emissions produced during combustion depends largely on how well the air and fuel are mixed in the combustion chamber. Increasing the injection pressure of the fuel can make the fuel atomized better and mix with the air more uniformly, and the pre-injection before the main injection ca...

AI Technical Summary

Problems solved by technology

This has two disadvantages. The first disadvantage is that there are too many piezoelectric material sheets for lamination (the total lift of the piezoelectric actuator is not enough), and there are potential safety hazards such as cracking and disconnection between the piezoelectric material sheets during the manufacturing process. The second disadvantage is that too many laminations increase the cost. These two disadvantages are particularly serious in large-scale manufacturing.

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