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

A proportional solenoid valve, oil pressure control technology, used in transmission control, components with teeth, belts/chains/gears, etc., can solve the problem of not considering changes in system oil temperature, requiring temperature sensors, and large workload. And other issues

Inactive Publication Date: 2016-06-15
TSINGHUA UNIV
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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

Method used

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

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Embodiment Construction

[0054] The hydraulic shift oil pressure control method based on the proportional solenoid valve of the present invention will be described in detail below.

[0055] The hydraulic shift oil pressure control method based on a proportional solenoid valve according to the present invention includes steps 1 to 8.

[0056] Step 1: Input the PWM signal to the proportional solenoid valve, and use the data acquisition module to collect the data points of the input voltage signal and the corresponding data points of the current signal, and then obtain the steady-state current and voltage waveform; the frequency of the PWM signal is fHz, accounting for Duty ratio D%, the voltage amplitude of the PWM signal is E; the sampling frequency of the data acquisition module is FHz, and within one cycle of the PWM signal, the number of data points of the collected voltage signal and the corresponding number of data points of the current signal:

[0057] n = ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/06F16H61/00
CPCF16H61/0021F16H61/061F16H2061/0255F16H2061/0258
Inventor 黄开胜江永亨卓晴鲁畅张尧郭书彪
Owner TSINGHUA UNIV
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