Method and system for accurately controlling position of liquid level pipe of filling head

Abstract

The invention provides a method and system for accurately controlling the position of a liquid level pipe of a filling head. According to the method, the liquid level pipe in the filling head extends out through hydraulic control and retracts through pneumatic control under the driving effect of liquid and gas double-medium composite action, so that the liquid level pipe is locked at any position. The control system comprises a hydraulic propulsion pipeline and a pneumatic retraction pipeline; the hydraulic propulsion pipeline is connected with an adjusting upper cavity of an actuating cylinder in the filling head, and the pneumatic retraction pipeline is connected with an adjusting lower cavity of the actuating cylinder in the filling head. According to the invention, the liquid level pipe extends and retracts through a process of air pressure-hydraulic pressure-hydraulic pressure-air pressure, air pushes liquid at first, then the liquid pushes the air, and when the liquid level pipe extends and retracts, running directions of fluids are opposite. Accurate control of the position of the liquid level pipe is realized, locking of the liquid level pipe at any position is realized accurately and reliably, and the problem of inaccurate position or repeated movement of the liquid level pipe under the action of filling pressure is solved.

Description

technical field [0001] The invention relates to a method and a system for precisely controlling the position of a liquid level tube of a filling head during vacuuming and liquid filling of a liquid storage tank of an automobile system and a system, belonging to the technical field of precise liquid filling control. Background technique [0002] With the development of traditional fuel vehicles and new energy vehicles, the models are becoming more and more diverse and abundant, and multi-model collinear production has become the current mainstream production mode. Filling fluid is an important part of the operation of the car. Such as figure 1 with figure 2 As shown, the structure of the existing filling head 25 includes an execution cylinder and a liquid level pipe 26. The execution cylinder is an actuator used to control the lifting of the liquid level pipe 26 on the filling head 25. An adjustment piston 28 is arranged in the execution cylinder, and the adjustment piston...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problem of inaccurate liquid level control in the existing automobile liquid filling technology, the present invention uses the incompressible characteristics of liquid to propose an accurate control method for the position of the liquid level tube of the filling head, which can realize the precise control of any position of the liquid level tube Locking, effectively solve the above problems

Images