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A self-sensing force and displacement piezoelectric valve and displacement control method

A technology of displacement control and self-sensing, applied in the direction of valve details, valve devices, valve operation/release devices, etc., can solve the problems of increasing valve volume and complexity, save cost and installation space, improve control accuracy and control speed effect

Active Publication Date: 2021-06-18
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned piezoelectric valve needs to be installed with an independent sensor, which increases the volume and complexity of the valve

Method used

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  • A self-sensing force and displacement piezoelectric valve and displacement control method
  • A self-sensing force and displacement piezoelectric valve and displacement control method
  • A self-sensing force and displacement piezoelectric valve and displacement control method

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Embodiment Construction

[0052] The specific implementation manner of the present invention will be described in detail below in combination with the technical scheme and accompanying drawings.

[0053] In the first aspect, a piezoelectric valve with self-sensing force and displacement is provided. The piezoelectric valve 1 includes a moving end 2, a disc spring gasket 3 for preloading, an upper cover 4, internal and external threads 5, and a preloading screw 6. , a base 7, a regular octagonal spacer 8, and a piezoelectric stack actuator 9.

[0054] The piezoelectric stack actuator 9 is a driving element. Since the tensile strength of piezoelectric ceramics is very low, a pre-tightening force of about 750N needs to be applied during use.

[0055] The upper cover 4 and the base 7 are connected by internal and external threads 5 with a pitch of 1 mm, and the upper cover 4 is a cylindrical structure.

[0056] The piezoelectric stack actuator 9 is a driving element, which is arranged inside the upper cov...

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Abstract

A piezoelectric valve with self-sensing force and displacement and displacement control method, establishes the relationship model among valve core displacement, output force, piezoelectric charge of piezoelectric actuator and driving voltage of piezoelectric actuator, and provides Algorithms for estimating spool displacement and output force with drive voltage self-sensing. Piezoelectric valves include piezoelectric stack actuators, upper covers, bases, moving ends, disc spring gaskets for preloading, regular octagonal pads, used in conjunction with sampling resistors, current integrators and hysteresis compensation in the control system. Algorithmic feed-forward PID controller realizes closed-loop control of spool displacement without sensor and real-time measurement of output force. The piezoelectric actuator of the present invention doubles as a driver and a sensor, and can detect the displacement and output force of the valve core at the same time without additional sensors; a hysteresis compensation algorithm is added to the controller to improve control accuracy and response speed; the piezoelectric actuator is obtained by using the current integration method The charge can be adjusted flexibly to compensate the piezoelectric leakage current for long-term stable operation.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement and control, and relates to the technology of electronically controlled piezoelectric valves in automobile gearboxes. In particular, a decoupling algorithm is used to obtain valve core displacement and output force signals from piezoelectric actuators, and to realize closed-loop displacement without additional sensors. method of control. Background technique [0002] The solenoid valve is a key component in the gearbox. Usually, the solenoid valve can only realize two-position control and cannot be adjusted continuously. Therefore, multiple solenoid valves need to be opened and closed to jointly control the gear shift. With the development of smart valve technology, piezoelectric valves have become an ideal substitute for solenoid valves. Piezoelectric valves have the advantages of high precision, fast response, low power consumption, long life, compact structure, environmental protecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K37/00F16K31/00
CPCF16K31/004F16K37/0041
Inventor 董维杰李铮杨磊
Owner DALIAN UNIV OF TECH