Test device for performance and reliability of piezoelectric actuator

Abstract

The invention belongs to a detecting device for a piezoelectric actuator for an electric-control high-pressure common-rail oil injector, in particular to a test device for performance and reliability of a piezoelectric actuator. The test device comprises a base, wherein the left end part of the base is equipped with a fixed base; a fixed bolt is rotatably arranged on the fixed base; a transition block and a supporting body are arranged on the base; the left end of the transition block is limited and fixed through the fixed bolt; a pushing body is arranged at the right end of the supporting body; a clamp body is arranged at the right end of the pushing body; the piezoelectric actuator is mounted on the transition block and the supporting body; the right end of the piezoelectric actuator is connected to the left end surface of the pushing body; a displacement transmission rod is arranged on the top of the pushing body; the displacement transmission rod is in contact with a measuring head of a micrometer gauge; the right side of the pushing body is connected with an acting piston; the acting piston is positioned in the clamp body; a pressure meter is mounted on the top of the clamp body; and an oil port of the pressure meter is connected with a hydraulic oil middle cavity of the clamp body. The test device can be used for testing relatively great pre-tightening force and output displacement, and can ensure accuracy of a reliability rest.

Description

technical field [0001] The invention belongs to a detection device for a piezoelectric actuator used in an electronically controlled high-pressure common rail fuel injector, in particular to a testing device for the performance and reliability of a piezoelectric actuator. Background technique [0002] With the implementation of the National IV emission regulations, diesel engines using high-pressure common rail fuel injection technology have been widely used. With the further increase of injection pressure and injection times, higher requirements are placed on the injector. This requirement can be met by using piezo injectors with fast response and high reliability. Piezoelectric actuator is the actuator of piezoelectric fuel injector, its displacement and force output characteristics are extremely important to the performance of piezoelectric fuel injector. [0003] According to the characteristics of the piezoelectric actuator, in order to use the piezoelectric actuator ...

AI Technical Summary

Problems solved by technology

The device mainly relies on its own manufacturing precision and coaxiality to control the force transmission. When the pre-tightening force is large (above 1000N), the force offset caused by manufacturing and fit clearance will be amplified by the size chain, and the piezoelectric will be executed. tors form a large bending moment through 10 9 The operation of the piezoelectric actuator will greatly reduce the life of the piezoelectric actuator and affect the measurement results

At the same time, due to the small test output force and small spring stiffness of the above test patents, the reliability test needs to run for 10 9 Above, in order to speed up the completion of the test, the running cycle needs to be greatly shortened

If the stiffness is small, the piezoelectric actuator has already performed the second action, but the spring has not returned, which will affect the test results

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