Hydraulic gear shifting oil pressure control method based on proportional electromagnetic valve

Abstract

The invention provides a hydraulic gear shifting oil pressure control method based on a proportional electromagnetic valve. The hydraulic gear shifting oil pressure control method based on the proportional electromagnetic valve comprises the steps that firstly, no temperature sensor is needed, and the equivalent inductance Ld of the proportional electromagnetic valve in the working process is measured directly; then a relation curve of the output oil pressure P, the average current I and the equivalent inductance Ld of the proportional electromagnetic valve at various oil temperatures is obtained, and obtained data are stored into a database, so that calling in the control process is facilitated; and then the control process is divided into s stages, feedforward control is conducted on the proportional electromagnetic valve in all stages of the control process through the relation curve of the output oil pressure P, the average current I and the equivalent inductance Ld in the database, and proportion integration differentiation (PID) feedback control is conducted after the feedforward control is finished, so that the difference between the actual output oil pressure and the ideal oil pressure in all stages of the control process is decreased, and thus the oil pressure impact in the hydraulic gear shifting process is reduced.

Description

technical field [0001] The invention relates to the field of hydraulic control, in particular to a hydraulic shift oil pressure control method based on a proportional solenoid valve. Background technique [0002] In the shifting process of the transmission, according to the change of the oil pressure and the oil filling process, it can be divided into four processes: rapid oil filling stage, buffer stage, step boost stage and voltage stabilization stage. In the buffer stage, if the actual oil pressure curve differs greatly from the ideal oil pressure curve, it will easily cause shift shock. Therefore, the closed-loop and compensation control of the oil pressure of the shifting system is mostly concentrated in the buffer stage, even if the deviation between the oil pressure change curve in the buffer stage and the ideal oil pressure curve is as small as possible. [0003] In the previous control schemes, the ideal oil pressure curve was taken as the target, and the oil press...

AI Technical Summary

Problems solved by technology

However, some of these methods do not consider the change of the oil temperature in the system, and some of them are calibrated first to obtain the influence of temperature on the oil pressure, which is used as feed-forward control, and then closed-loop control of the oil pressure

This method of calibration is labor-intensive and requires a temperature sensor

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