Equivalent Inductance Measurement Method and Oil Pressure Control Method of Proportional Solenoid Valve
A technology of proportional solenoid valve and equivalent inductance, which is applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as changes, and achieve the effect of improving accuracy and simplifying workload
Inactive Publication Date: 2018-08-28
TSINGHUA UNIV
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Problems solved by technology
Equivalent inductance L d The difficulty of measurement is also that the inductance is a binary function of temperature and current I, even at the same temperature, it will change with the change of current I
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[0047] The equivalent inductance measurement method and the oil pressure control method of the proportional solenoid valve of the present invention will be described in detail below with reference to the accompanying drawings.
[0048] Firstly, the method for measuring the equivalent inductance of the proportional solenoid valve according to the first aspect of the present invention will be described.
[0049] refer to figure 1 , The equivalent inductance measurement method of the proportional solenoid valve according to the present invention includes steps 1 to 5.
[0050] 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 The empty ratio is D%, the voltage amplitude of the PWM signal is E; the sampl...
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The invention provides an equivalent inductance measurement method of a proportional solenoid valve and an oil pressure control method. The equivalent inductance measurement method can avoid temperature measurement, directly uses a collected current curve of the proportional solenoid valve to obtain a relation function of inductance, and accurately measures the equivalent inductance of the proportional solenoid valve during a control process. For noise removal processing of the current curve, the equivalent inductance measurement method can ensure validity of the collected current curve, eliminate a deviation part of an inductance function, and improve the accuracy of the equivalent inductance of the proportional solenoid valve. The oil pressure control method does not need to use any temperature sensor to calibrate the influence of the oil temperature on the oil pressure output by the solenoid valve, and changes of the oil temperature are reflected by changes of the equivalent inductance of the proportional solenoid valve. The oil pressure output by the proportional solenoid valve is controlled accurately by the equivalent inductance measured by the equivalent inductance measurement method and the input current, so that an oil pressure control structure and the work load of temperature sensor calibration can be simplified.
Description
technical field [0001] The invention relates to the control field of proportional solenoid valves, in particular to an equivalent inductance measurement method and an oil pressure control method of a proportional solenoid valve. Background technique [0002] Hydraulic proportional solenoid valves are key components in heavy-duty vehicle shift control systems and other hydraulic systems. Whether the output pressure of the proportional solenoid valve is accurate or not has a great influence on the shift stability and comfort of the transmission system. In the case that the oil temperature of the transmission system does not change greatly, the proportional solenoid valve output oil pressure P and its input current I have a definite functional relationship, and its control accuracy is also relatively easy to be guaranteed. But in practice, the oil temperature of the transmission system will inevitably have a considerable temperature change, which will cause the input-output re...
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IPC IPC(8): G01R27/26
CPCG01R27/26
Inventor 黄开胜江永亨卓晴鲁畅张尧郭书彪
Owner TSINGHUA UNIV