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An oil temperature estimation method based on electrical characteristics of oil pump motor

A technology of oil pump motor and electrical characteristics, applied in the field of oil temperature estimation, to avoid inaccurate acquisition, simplify the structure, and reduce the failure rate

Active Publication Date: 2022-02-22
天津民昌科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for estimating oil temperature based on the electrical characteristics of the oil pump motor, so as to solve the aforementioned problems in the prior art

Method used

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  • An oil temperature estimation method based on electrical characteristics of oil pump motor
  • An oil temperature estimation method based on electrical characteristics of oil pump motor
  • An oil temperature estimation method based on electrical characteristics of oil pump motor

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Experimental program
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Embodiment 1

[0020] Such as figure 1 As shown, in this embodiment, an oil temperature estimation method based on the electrical characteristics of the oil pump motor is provided, including the following steps,

[0021] S1. Determine the minimum operating temperature and maximum operating temperature of the lubricating oil to obtain the step size of the oil temperature rise; determine the minimum operating speed and maximum operating speed of the oil pump motor to obtain the step size of the speed increase;

[0022] S2. Adjust the output speed of the oil pump motor to the minimum operating speed; adjust the current oil temperature of the lubricating oil to the lowest operating temperature to obtain the current of the oil pump motor; increase the oil temperature of the lubricating oil according to the temperature rise step, and obtain each oil in turn temperature corresponding to the current of the oil pump motor until the oil temperature rises to the highest operating temperature, and obtai...

Embodiment 2

[0029] In this embodiment, assuming that the minimum operating speed is T_rpm1, then according to the calculation method in Embodiment 1, the corresponding relationship formula between the minimum operating speed and oil temperature can be obtained as

[0030] T_rpm1=f(I_rpm1)=kn1*I_rpm1^n1+

[0031] kn1-1*I_rpm1^(n1-1)+...k11*I_rpm1+k01

[0032] In the above formula, T_rpm1 represents the oil temperature corresponding to the minimum operating speed, I_rpm1 represents the motor operating current corresponding to the minimum operating speed, T_rpm1 is a function of I_rpm1, and the expression of the function is shown in the above formula. Among them, n1 represents the number of polynomial fitting, and kn1, knx-1...k11, k01 respectively correspond to the coefficients of polynomial fitting. Through the calibration process, the polynomial fitting coefficients can be known, so when the motor current corresponding to the minimum operating speed is known, that is The above formula ca...

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Abstract

The invention discloses an oil temperature estimation method based on the electrical characteristics of an oil pump motor, which adjusts the output speed of the oil pump motor to the lowest working speed; adjusts the oil temperature of lubricating oil to the lowest working temperature, and records the corresponding current; according to the temperature rise step length Raise the oil temperature, obtain the current corresponding to each oil temperature in turn, until the oil temperature rises to the highest operating temperature, obtain the mapping relationship between the oil temperature and the oil pump motor current at the lowest operating speed, and obtain the relationship between the oil temperature and the oil pump motor current at the lowest operating speed The calculation formula of the current; gradually increase the output speed according to the speed increase step until the maximum working speed, record the mapping relationship between the oil temperature and the motor current at each output speed, and obtain the calculation formula of the oil temperature and the oil pump motor current at each output speed . The advantage is that the oil temperature can be obtained by using the oil temperature estimation method, which reduces the cost and hardware failure rate, and avoids the inaccurate acquisition of oil temperature data caused by the failure of the oil temperature sensor in the prior art.

Description

technical field [0001] The invention relates to the technical field of oil temperature estimation, in particular to an oil temperature estimation method based on electrical characteristics of an oil pump motor. Background technique [0002] Transmission systems such as motors and reducers inevitably have certain wear and tear during the process of gear meshing and bearing internal rotation. In order to reduce friction loss and protect transmission components, lubricating oil is usually used to lubricate the surface of the components. In the process of lubricating oil flowing on the surface of components, in addition to reducing wear and providing lubrication, it can also take away heat. By adding a heat exchanger or refrigerator in the oil circulation circuit, the heat taken away by the oil temperature can be dissipated. off, so as to achieve the effect of oil cooling. There are many forms of lubricating oil circulation in the oil circuit, some use centrifugal force to thro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/19
CPCG05D23/1931
Inventor 李庆旭
Owner 天津民昌科技有限公司