CN-122001262-A - Low-temperature quick starting method for electronic oil pump

CN122001262ACN 122001262 ACN122001262 ACN 122001262ACN-122001262-A

Abstract

The invention relates to a low-temperature quick starting method of an electronic oil pump, which aims to solve the technical problem that the existing electronic oil pump is insufficient in rotating speed response speed under the working conditions of low temperature and load change along with time. The method comprises the steps of starting at the initial stage of starting, judging that the actual rotating speed is lower than a preset threshold value of the entering power limiting rotating speed, starting with maximum phase current to ensure starting efficiency, starting power limiting closed-loop control when the actual rotating speed is higher than the threshold value, dynamically adjusting the increasing and decreasing step length of a reference rotating speed instruction by comparing the current power with the rated power, adaptively adjusting the step length according to the viscosity coefficient of oil, the oil temperature and the real-time rotating speed by a table lookup method, and finally realizing closed-loop control of a motor by PI control, coordinate transformation and SVPWM algorithm based on the reference rotating speed instruction. The invention can realize the quick start and quick response of the rotating speed of the electronic oil pump at low temperature, simultaneously ensure the safety of the oil pump function, adapt to different oil products and working condition changes, and has wide application range.

Inventors

LI DEHUI
LIAO QIN

Assignees

长沙市健科电子有限公司

Dates

Publication Date: 20260508
Application Date: 20260204

Claims (5)

1. The low-temperature quick starting method for the electronic oil pump is characterized by comprising the following steps of: s1, generating a real-time reference rotating speed instruction of the electronic oil pump according to a rotating speed instruction generating algorithm: S1.1, presetting threshold parameters according to rated power of an oil pump, wherein the threshold parameters comprise a threshold value for limiting the rotation speed of the input power, a maximum rotation speed value and a minimum rotation speed value; S1.2, judging whether the current actual rotating speed is greater than the threshold value of the entering power limiting rotating speed, and executing the corresponding step according to a judging result; If not, the electronic oil pump is started with the maximum phase current, and at the moment, a reference rotating speed instruction of the oil pump is set to be equal to an input rotating speed instruction; If yes, entering power limiting closed-loop control, namely calculating the real-time power of the electronic oil pump, comparing the real-time power with the rated power, and executing the step S1.3, the step S1.4 or the step S1.5 according to the comparison result; S1.3, if the real-time power is equal to the rated power, the reference rotating speed command is equal to the input rotating speed command; S1.4, if the real-time power is smaller than the rated power, adding a speed step to the last reference rotating speed instruction to serve as the current reference rotating speed instruction; s1.5, if the real-time power is larger than the rated power, the reference rotating speed instruction of this time is subjected to speed reduction adjustment, namely, when the power is limited for the first time, the reference rotating speed instruction is assigned to be the actual rotating speed of the last oil pump; s1.6, limiting amplitude of the reference rotating speed command generated in the steps S1.4 and S1.5 to ensure that the reference rotating speed command is not higher than the input rotating speed command and not lower than the minimum rotating speed value; S1.7, the speed step is adaptively determined according to the viscosity coefficient of the oil product, the oil temperature and the current actual rotating speed; S2, performing closed-loop control on the permanent magnet synchronous motor, namely generating a current reference value through a PI controller based on the reference rotating speed instruction and the current actual rotating speed generated in the step S1, and driving an inverter by adopting an SVPWM algorithm to realize closed-loop control on the electronic oil pump.
2. The method for quickly starting the electronic oil pump at low temperature according to claim 1, wherein the limiting process in step S1.6 is specifically: And if the last oil pump reference rotating speed command-speed step value is smaller than the rotating speed minimum value, the reference rotating speed command is assigned as the rotating speed minimum value.
3. The method for quickly starting the electronic oil pump at low temperature according to claim 1, wherein in step S1.7, a table look-up method is adopted to determine the speed step according to the viscosity coefficient of the oil product, the oil temperature and the current actual rotating speed.
4. The method for quickly starting the electronic oil pump at low temperature according to claim 1, wherein in step S1.7, a fitting algorithm is adopted to calculate the speed step according to the viscosity coefficient of the oil product, the oil temperature and the current actual rotating speed.
5. The method of claim 1, wherein in step S2, the q-axis current reference value output by the PI controller reaches the q-axis current limit value at the initial stage of starting based on the reference rotation speed command generated in step S1.2 and the current actual rotation speed, so as to realize the maximum phase current starting.

Description

Low-temperature quick starting method for electronic oil pump Technical Field The invention relates to the technical field of oil pumps, in particular to a low-temperature quick starting method of an electronic oil pump. Background The electronic oil pump is a core component of a modern engine lubricating system, and is used for pressurizing engine oil and then conveying the engine oil to the surfaces of all moving parts of the engine to form an effective lubricating film so as to reduce abrasion and prolong the service life of the engine. Meanwhile, the viscosity of the engine oil is obviously affected by temperature, and under low-temperature working conditions (such as starting in winter, running in alpine regions and the like), the viscosity of the engine oil is rapidly increased, so that the driving load of an electronic engine oil pump is greatly increased, and as the running time of the engine is prolonged, the temperature of the engine oil is increased, the viscosity is gradually reduced, and the load is also reduced. Therefore, the electronic oil pump needs to be started quickly under the low-temperature working condition, and can respond to the target rotating speed instruction of the engine quickly, so that sufficient lubrication can be obtained in the engine starting stage, and the abrasion of parts caused by insufficient lubrication is avoided. In the existing control method of the electronic oil pump, the motor closed-loop control is mostly realized by directly or indirectly limiting the motor power, wherein in the power closed-loop control scheme, the rotating speed acceleration step length is usually set by adopting a fixed value. However, in a low-temperature environment, the engine oil has high viscosity and high load, and the control mode of a fixed step length is difficult to adapt to the dynamic change of the load, if the step length is set too large, the motor power is easy to exceed a design rated value, the motor and an oil pump component can be damaged during long-term operation, the function safety is affected, if the step length is set too small, the quick response of the rotating speed can not be realized, the lubricating requirement of an engine during low-temperature start can not be met, the starting efficiency is low, and even the engine fault can be possibly caused due to untimely lubrication. Aiming at the technical limitation that the rotating speed response speed and the functional safety of the electronic oil pump are difficult to be compatible under the working conditions of low temperature and load dynamic change along with time in the prior art, a low-temperature quick starting method of the electronic oil pump, which can adapt to different oil products and different temperature working conditions and is compatible with quick starting response and functional safety, is needed. Disclosure of Invention Aiming at the problems, the invention provides the low-temperature quick starting method of the electronic oil pump, which can adapt to different oil products and different temperature working conditions and has quick starting response and safe function. The invention solves the technical problems by adopting the technical scheme that the low-temperature quick starting method of the electronic oil pump specifically comprises the following steps: s1, generating a real-time reference rotating speed instruction of the electronic oil pump according to a rotating speed instruction generating algorithm: S1.1, presetting threshold parameters according to rated power of an oil pump, wherein the threshold parameters comprise a threshold value for limiting the rotation speed of the input power, a maximum rotation speed value and a minimum rotation speed value; S1.2, judging whether the current actual rotating speed is greater than the threshold value of the entering power limiting rotating speed, and executing the corresponding step according to a judging result; If not, the electronic oil pump is started with the maximum phase current, and at the moment, a reference rotating speed instruction of the oil pump is set to be equal to an input rotating speed instruction; If yes, entering power limiting closed-loop control, namely calculating the real-time power of the electronic oil pump, comparing the real-time power with the rated power, and executing the step S1.3, the step S1.4 or the step S1.5 according to the comparison result; S1.3, if the real-time power is equal to the rated power, the reference rotating speed command is equal to the input rotating speed command; S1.4, if the real-time power is smaller than the rated power, adding a speed step to the last reference rotating speed instruction to serve as the current reference rotating speed instruction; s1.5, if the real-time power is larger than the rated power, the reference rotating speed instruction of this time is subjected to speed reduction adjustment, namely, when the power is limited for the first time, the reference r