Electromagnetic valve pressure closed-loop control method and controller design method thereof

Abstract

The invention provides an electromagnetic valve pressure closed-loop control method. The electromagnetic valve pressure closed-loop control method comprises the following steps that S1, the set pressure of an electromagnetic valve is obtained; S2, the actual pressure is subtracted from the set pressure to obtain the control deviation of the pressure of the electromagnetic valve; S3, according to the control deviation of the pressure of the electromagnetic valve, the initial control pressure u0 of the electromagnetic valve is calculated; S4, the interference pressure estimated by a linear expansion observer LESO is subtracted from the u0 to obtain the corrected control pressure u; S5, the target current of the electromagnetic valve is calculated according to a characteristic curve of the pressure current (p-I) of the electromagnetic valve and the corrected control pressure; S6, a pressure sensor collects the actual pressure of the electromagnetic valve; S7, the linear expansion observer LESO calculates the interference pressure according to the actual pressure of the electromagnetic valve and the corrected control pressure; and S8, a control cycle is completed; and the invention further discloses a design method of a controller for the closed-loop control method for the pressure of the electromagnetic valve, self-adaptive control over the electromagnetic valve of a clutch is achieved, and the difficulty of parameter setting of the controller is lowered.

Description

technical field [0001] The invention belongs to the technical field of solenoid valve pressure control, and in particular relates to a closed-loop control method of solenoid valve pressure and a controller design method thereof. Background technique [0002] The dynamic response process of the solenoid valve includes not only steady-state nonlinear links such as pressure-current (PI) hysteresis, but also dynamic nonlinear processes such as hysteresis, which requires closed-loop control of the pressure of the solenoid valve. In addition, both linear and nonlinear characteristics are related to working conditions, such as the direction of current change, oil temperature, etc. The characteristics of solenoid valves, especially the dynamic characteristics, are difficult to express through precise mathematical equations. Therefore, some control methods that require high precision in the mathematical model of the controlled object are not suitable for closed-loop control of soleno...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages in the prior art that the pressure control of the solenoid valve adopts the PID controller, the control effect is not ideal, the calibration is difficult, and the control consistency is poor.

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