An adjustable damping shock absorber based on piezoelectric self-sensing

Abstract

The invention discloses a piezoelectric self-sensing based adjustable damper. The piezoelectric self-sensing based adjustable damper comprises an upper lifting lug, a dustproof cover, a piston rod, a guide seat assembly, a working cylinder barrel, a working piston assembly, a seal ring, a floating piston, a closed air chamber and a lower lifting lug, wherein the working piston assembly comprises a compression block, a limiting block, a limiting rod, a piezoelectric valve plate, a piston, a flow valve, a piston packing ring, a rebound valve, a preset normal open hole and a compression nut; the piezoelectric valve plate is formed by connecting a plurality of piezoelectric displacement units in series; each piezoelectric displacement unit is composed of a piezoelectric material stack layer and a displacement enlargement mechanism. The piezoelectric valve plate generates induced charge under the action of oil pressure, extracts induced voltage and exerts control voltage via a bridge circuit to change the size of the valve plate so that the size of a throttling area changes and a damping coefficient is adjustable. Based on the piezoelectric self-sensing effect, a sensor and an actuator are integrated on the same valve plate, the piezoelectric self-sensing based adjustable damper is simplified in structure, stable to control and high in dynamic response speed, and the capacity coupling is avoided.

Description

technical field [0001] The invention belongs to the field of shock absorbers, in particular to an adjustable damping shock absorber based on piezoelectric self-sensing. Background technique [0002] At present, the suspension part of most vehicles still uses the traditional double-tube shock absorber, and its damping coefficient cannot be adjusted according to the driving conditions. The design can only guarantee good vibration reduction conditions under certain specific driving conditions. It is difficult to adapt to different road conditions, so the vibration damping performance is limited. In addition, most current shock absorbers with adjustable damping require an additional sensor in addition to the actuator, which not only increases energy consumption, is not conducive to energy saving and emission reduction, but also makes the device more complicated and less stable. In addition, if the distance between the actuator and the sensor is relatively close, capacitive coup...

AI Technical Summary

Problems solved by technology

Although piezoelectric materials are used as sensors and actuators respectively, the self-sensing of piezoelectric actuators has not been realized, and the structure is complex, capacitive coupling may occur, and the output damping force is very limited.

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