CN114499051A - Oil-cooled motor cooling system and method for determining target rotating speed of oil pump thereof - Google Patents
Oil-cooled motor cooling system and method for determining target rotating speed of oil pump thereof Download PDFInfo
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- CN114499051A CN114499051A CN202210111860.7A CN202210111860A CN114499051A CN 114499051 A CN114499051 A CN 114499051A CN 202210111860 A CN202210111860 A CN 202210111860A CN 114499051 A CN114499051 A CN 114499051A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The invention discloses an oil-cooled motor cooling system and a method for determining the target rotating speed of an oil pump of the oil-cooled motor cooling system. It has realized the cooling that becomes more meticulous to oil-cooled motor system, has reduced the oil pump consumption, has avoided oil pump cooling lag and the violent fluctuation of oil-cooled motor temperature, has solved oil-cooled motor operation in-process oil pump consumption big, the oil-cooled motor temperature fluctuation is violent, oil pump cooling lag scheduling problem.
Description
Technical Field
The invention belongs to the technical field of electric automobile heat management, and particularly relates to an oil-cooled motor cooling system and a method for determining target rotating speed of an oil pump of the oil-cooled motor cooling system.
Background
During the operation of the oil-cooled motor, the steady-state working condition and the transient working condition can be divided according to the heat balance condition inside the system. Corresponding to the control of the oil pump, if the flow is controlled to be fully opened all the time, the oil-cooled motor and the lubricating oil can both be guaranteed not to be over-temperature, but the problem of severe temperature change of the oil-cooled motor exists in the whole working condition range of the operation of the oil-cooled motor, so that the torque output precision of the oil-cooled motor is reduced, and the power consumption of the oil pump is too large; if the oil pump flow is set only according to the current NTC sampling temperature of the oil-cooled motor, the problems of local overheating and cooling delay of an oil-cooled motor rotor exist, the oil-cooled motor is caused to be thermally ineffective, the oil pump works unsmoothly, and the efficiency is low.
CN112416030A discloses an oil temperature estimation method based on electrical characteristics of an oil pump motor, which obtains a corresponding oil temperature through a calibration method by using a rotation speed and a current of the oil pump motor. However, because the cooling condition of the oil-cooled motor and the flowing condition of the cooling oil are related to the current operating condition of the oil-cooled motor, the difference of the cooling conditions can cause the calibrated oil temperature to have larger deviation from the actual oil temperature, and the difference of the flowing conditions can have larger influence on the resistance of the oil passage.
CN112234770A discloses an oil-cooled motor control device and method, and the described oil-cooled motor temperature control method includes: controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting groove, the flow of the lubricating oil and the temperature control target of the lubricating oil. The control method has the disadvantages that the system is too complex due to the excessive input variables, the coupling relation exists among the input variables, and the control target does not explain the determination basis.
Disclosure of Invention
The invention aims to provide an oil-cooled motor cooling system and a method for determining the target rotating speed of an oil pump of the oil-cooled motor cooling system, so that the power consumption of the oil pump is reduced, and the cooling lag of the oil pump and the severe fluctuation of the temperature of the oil-cooled motor are avoided.
The invention discloses a method for determining the target rotating speed of an oil pump of an oil-cooled motor cooling system, which comprises the following steps:
the method comprises the steps of obtaining the ambient temperature, the rotating speed of an oil-cooled motor, the torque of the oil-cooled motor, the stator voltage of the oil-cooled motor, the stator current of the oil-cooled motor, the stator temperature of the oil-cooled motor, the actual rotating speed of an oil pump and the current of the oil pump under the current working condition.
And determining the heating power of the current oil-cooled motor system according to the ambient temperature, the oil-cooled motor rotating speed, the oil-cooled motor torque, the oil-cooled motor stator voltage and the oil-cooled motor stator current under the current working condition.
And determining the equivalent temperature of the current oil-cooled motor according to the temperature of the stator of the oil-cooled motor under the current working condition, and obtaining the equivalent temperature change rate of the current oil-cooled motor by derivation of the equivalent temperature of the current oil-cooled motor.
And determining the temperature of the cooling oil at the inlet of the current oil pump according to the actual rotating speed of the oil pump and the current of the oil pump under the current working condition.
Inputting the heating power of the current oil-cooled motor system, the current oil-cooled motor equivalent temperature change rate and the current oil pump inlet cooling oil temperature into a one-dimensional heat management power consumption model, and outputting a cooling oil target temperature and an oil-cooled motor target temperature change rate at an oil pump inlet after calculation.
And integrating the product of the target equivalent temperature change rate of the oil-cooled motor and the preset heat capacity of the oil-cooled motor with time to obtain the target heat storage amount.
And taking the integral of the heating power of the current oil-cooled motor system to time as the current heating value.
The difference between the current heat generation amount and the target heat storage amount is taken as a target heat dissipation amount (i.e., target heat dissipation amount = current heat generation amount — target heat storage amount).
And determining the target cooling oil flow with the optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition according to the target heat dissipation capacity and the target cooling oil temperature at the inlet of the oil pump.
And determining the lubricating demand flow of the oil-cooled motor system under the current working condition according to the rotating speed of the oil-cooled motor under the current working condition and the temperature of the cooling oil at the inlet of the current oil pump.
And taking the larger value of the target cooling oil flow and the lubricating required flow as the cooling oil flow required value under the current working condition.
And determining the target control quantity of the flow of the cooling oil under the current working condition according to the required value of the flow of the cooling oil under the current working condition and the flow of the cooling oil with the external characteristic of the oil pump.
And determining the target rotating speed of the oil pump under the current working condition according to the temperature of the cooling oil at the inlet of the oil pump and the target control quantity of the flow of the cooling oil under the current working condition.
Preferably, the specific way of determining the heating power of the current oil-cooled motor system is as follows:
and inquiring a preset oil-cooled motor system efficiency MAP table according to the ambient temperature, the oil-cooled motor rotating speed and the oil-cooled motor torque under the current working condition to obtain the efficiency value of the current oil-cooled motor system.
And calculating to obtain the input power of the current oil-cooled motor system by using the stator voltage of the oil-cooled motor and the stator current of the oil-cooled motor under the current working condition.
Using the formula: heating power = input power x (1-efficiency value), and the heating power of the current oil-cooled motor system is calculated.
The preset efficiency MAP table of the oil-cooled motor system is a corresponding relation table of the environment temperature, the rotating speed of the oil-cooled motor, the torque of the oil-cooled motor and the efficiency value of the oil-cooled motor system, which are obtained in a calibration mode.
Preferably, the specific way of determining the equivalent temperature of the current oil-cooled motor is as follows:
and inquiring a preset rotor temperature MAP table according to the temperature of the stator of the oil-cooled motor under the current working condition to obtain the temperature of the rotor of the oil-cooled motor under the current working condition.
And adding the product of the cold motor stator temperature under the current working condition and the preset stator mass coefficient and the product of the oil-cooled motor rotor temperature under the current working condition and the preset rotor mass coefficient to obtain the equivalent temperature of the current oil-cooled motor.
The preset rotor temperature MAP table is a corresponding relation table of the oil-cooled motor stator temperature and the oil-cooled motor rotor temperature obtained in a calibration mode.
Preferably, the specific mode for determining the target control quantity of the cooling oil flow under the current working condition comprises the following steps of;
s1, judging whether the required value of the cooling oil flow under the current working condition is larger than the cooling oil flow of the external characteristic of the oil pump under the current working condition, if so, executing S2, otherwise, executing S3.
And S2, taking the flow of the cooling oil with the external characteristic of the oil pump under the current working condition as the target control quantity of the flow of the cooling oil under the current working condition, and then ending.
And S3, judging whether the required value of the cooling oil flow at the current moment is greater than that at the previous moment, if so, executing S4, otherwise, executing S5.
And S4, taking the required value of the cooling oil flow at the current moment as the target control quantity of the cooling oil flow under the current working condition, and then ending.
And S5, taking the required value of the flow rate of the cooling oil at the previous moment as the target control quantity of the flow rate of the cooling oil under the current working condition, maintaining the required value of the flow rate of the cooling oil for a preset time, taking the required value of the flow rate of the cooling oil at the current moment as the target control quantity of the flow rate of the cooling oil under the current working condition, and ending.
Preferably, the specific way of determining the temperature of the cooling oil at the inlet of the current oil pump is as follows:
and inquiring a preset cooling oil temperature MAP table according to the actual rotating speed of the oil pump and the current of the oil pump under the current working condition to obtain the current cooling oil temperature at the inlet of the oil pump. The preset cooling oil temperature MAP table is a corresponding relation table of the actual rotating speed of the oil pump, the current of the oil pump and the temperature of the cooling oil at the inlet of the oil pump, which is obtained in a calibration mode.
Preferably, the specific way of determining the optimal target cooling oil flow rate of the integrated energy consumption of the oil-cooled motor system under the current working condition is as follows:
and inquiring a preset cooling oil flow MAP table according to the target heat dissipation capacity and the target cooling oil temperature at the inlet of the oil pump, and obtaining the target cooling oil flow with the optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition. The preset cooling oil flow MAP table is a corresponding relation table of target cooling oil flow obtained in a calibration mode, target cooling oil temperature at an oil pump inlet and optimal comprehensive energy consumption of the oil-cooled motor system.
Preferably, the specific way of determining the lubrication demand flow of the oil-cooled motor system under the current working condition is as follows:
and inquiring a preset lubrication demand flow MAP table according to the rotating speed of the oil-cooled motor under the current working condition and the temperature of the cooling oil at the inlet of the current oil pump, and obtaining the lubrication demand flow of the oil-cooled motor system under the current working condition. The preset lubrication demand flow MAP table is a corresponding relation table of the oil-cooled motor rotating speed, the cooling oil temperature at the oil pump inlet and the lubrication demand flow of the oil-cooled motor system, which is obtained in a calibration mode.
Preferably, the specific way of determining the target rotation speed of the oil pump under the current working condition is as follows:
and inquiring a preset oil pump rotating speed MAP table according to the temperature of the cooling oil at the inlet of the current oil pump and the target control quantity of the flow of the cooling oil under the current working condition to obtain the target rotating speed of the oil pump under the current working condition. The preset oil pump rotating speed MAP table is a corresponding relation table of the oil pump inlet cooling oil temperature, the cooling oil flow target control quantity and the oil pump target rotating speed, which are obtained in a calibration mode.
The invention relates to an oil-cooled motor cooling system which comprises an oil-cooled motor system, a heat exchanger, an oil filter, an oil pump, an oil-cooled motor controller and an oil pump controller, wherein the heat exchanger, the oil filter, the oil pump and the oil-cooled motor system are communicated to form a cooling oil duct; the oil-cooled motor controller determines the target rotation speed of the oil pump by adopting the determination method.
The invention realizes the refined cooling of the oil-cooled motor system, reduces the power consumption of the oil pump, avoids the cooling lag of the oil pump and the severe temperature fluctuation of the oil-cooled motor, and solves the problems of large power consumption of the oil pump, severe temperature fluctuation of the oil-cooled motor, cooling lag of the oil pump and the like in the operation process of the oil-cooled motor.
Drawings
Fig. 1 is a schematic block diagram of a cooling system of an oil-cooled motor in this embodiment.
Fig. 2 is a strategy diagram for determining the target rotation speed of the oil pump in the present embodiment.
Fig. 3 is a flow chart of determining the target rotation speed of the oil pump in this embodiment.
Fig. 4 is a flowchart of determining the target control amount of the flow rate of the cooling oil under the current operating condition in the present embodiment.
Detailed Description
As shown in fig. 1, the cooling system of the oil-cooled motor in the present embodiment includes an oil-cooled motor system, a heat exchanger 1, an oil filter 2 (i.e., an oil filter), an oil pump 3, an oil-cooled motor controller 5, and an oil pump controller 6, the oil-cooled motor system includes an oil-cooled motor 7 and a speed reducer 4 connected to the oil-cooled motor 7, the heat exchanger 1, the oil filter 2, the oil pump 3, the speed reducer 4, and the oil-cooled motor 7 are communicated to form a cooling oil passage, the oil-cooled motor controller 5 is connected to the oil-cooled motor 7 and the oil pump controller 6, the oil pump controller 6 is connected to the oil-cooled motor 7, the oil-cooled motor controller 5 controls the oil-cooled motor 7 to operate, determines a target rotation speed of the oil pump, and sends the target rotation speed of the oil pump to the oil pump controller 6, the oil pump controller 6 controls the oil pump 3 to operate according to the target rotation speed of the oil pump, the oil pump 3 pumps the cooling oil passing through the oil filter 2 into the speed reducer oil passage, the cooling oil-cooled motor 7 through the speed reducer oil passage, and the stator winding and the rotor of the oil-cooled motor 7 are cooled, the cooling oil which cools the stator winding and the rotor of the oil-cooled motor 7 flows into the oil duct of the speed reducer, the cooling oil which flows out of the oil duct of the speed reducer enters the heat exchanger 1 for heat dissipation, and the cooling oil which dissipates heat enters the oil filter 2 for filtering.
As shown in fig. 2 to 4, the method of the oil-cooled motor controller 5 determining the target rotation speed of the oil pump includes:
the method comprises the steps of firstly, obtaining the ambient temperature and the rotating speed of an oil-cooled motor, the torque of the oil-cooled motor, the stator voltage of the oil-cooled motor, the stator current of the oil-cooled motor, the stator temperature of the oil-cooled motor, the actual rotating speed of an oil pump and the current of the oil pump under the current working condition.
And secondly, determining the heating power of the current oil-cooled motor system according to the ambient temperature, the rotating speed of the oil-cooled motor, the torque of the oil-cooled motor, the stator voltage of the oil-cooled motor and the stator current of the oil-cooled motor under the current working condition.
The concrete mode is as follows:
firstly, according to the ambient temperature, the rotating speed of the oil-cooled motor and the torque of the oil-cooled motor under the current working condition, a preset efficiency MAP table of the oil-cooled motor system is inquired, and the efficiency value of the current oil-cooled motor system is obtained.
And then, calculating (namely multiplying the stator voltage of the oil-cooled motor and the stator current of the oil-cooled motor) by using the stator voltage of the oil-cooled motor and the stator current of the oil-cooled motor under the current working condition to obtain the input power of the current oil-cooled motor system.
Finally, using the formula: heating power = input power x (1-efficiency value), and the heating power of the current oil-cooled motor system is calculated.
The preset efficiency MAP table of the oil-cooled motor system is a corresponding relation table of the environment temperature, the rotating speed of the oil-cooled motor, the torque of the oil-cooled motor and the efficiency value of the oil-cooled motor system, which are obtained in a calibration mode.
And thirdly, determining the equivalent temperature of the current oil-cooled motor according to the temperature of the stator of the oil-cooled motor under the current working condition, and deriving the equivalent temperature of the current oil-cooled motor to obtain the equivalent temperature change rate of the current oil-cooled motor.
The specific way for determining the equivalent temperature of the current oil-cooled motor is as follows:
firstly, according to the temperature of the oil-cooled motor stator under the current working condition, a preset rotor temperature MAP table is inquired, and the temperature of the oil-cooled motor rotor under the current working condition is obtained.
And then, adding the product of the cold motor stator temperature under the current working condition and the preset stator mass coefficient and the product of the oil-cooled motor rotor temperature under the current working condition and the preset rotor mass coefficient to obtain the equivalent temperature of the current oil-cooled motor.
The preset rotor temperature MAP table is a corresponding relation table of the oil-cooled motor stator temperature and the oil-cooled motor rotor temperature obtained in a calibration mode.
And fourthly, determining the temperature of the cooling oil at the inlet of the oil pump according to the actual rotating speed of the oil pump and the current of the oil pump under the current working condition.
The concrete mode is as follows: and inquiring a preset cooling oil temperature MAP table according to the actual rotating speed of the oil pump and the current of the oil pump under the current working condition to obtain the current cooling oil temperature at the inlet of the oil pump. The preset cooling oil temperature MAP table is a corresponding relation table of the actual rotating speed of the oil pump, the current of the oil pump and the temperature of the cooling oil at the inlet of the oil pump, which is obtained in a calibration mode.
And fifthly, inputting the heating power of the current oil-cooled motor system, the current oil-cooled motor equivalent temperature change rate and the current cooling oil temperature at the oil pump inlet into a one-dimensional heat management power consumption model, and outputting a cooling oil target temperature at the oil pump inlet and an oil-cooled motor target temperature change rate after calculation. A neural network control algorithm after learning optimization is added into the one-dimensional heat management power consumption model, and the neural network control algorithm performs learning optimization by using sample data of the oil-cooled motor system under various different operating conditions.
And sixthly, integrating the product of the target equivalent temperature change rate of the oil-cooled motor and the preset heat capacity of the oil-cooled motor with time to serve as the target heat storage amount.
And seventhly, taking the integral of the heating power of the current oil cooling motor system to time as the current heating value.
And eighthly, taking the difference value between the current heating value and the target heat storage value as a target heat dissipation value, namely the target heat dissipation value = the current heating value-the target heat storage value. According to a first law of thermodynamics, an oil-cooled motor system is taken as a research object, and the heat dissipation capacity of the oil-cooled motor system is equal to the heat productivity minus the heat storage capacity. The heat dissipation capacity is related to the flow of the cooling oil, and the larger the rotating speed of the oil pump is, the larger the flow of the cooling oil is, and the larger the heat dissipation capacity of the oil-cooled motor system is.
And ninthly, determining the target cooling oil flow with the optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition according to the target heat dissipation capacity and the target temperature of the cooling oil at the inlet of the oil pump.
The concrete mode is as follows: and inquiring a preset cooling oil flow MAP table according to the target heat dissipation capacity and the target cooling oil temperature at the inlet of the oil pump, and obtaining the target cooling oil flow with the optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition. The preset cooling oil flow MAP table is a corresponding relation table of target cooling oil flow obtained in a calibration mode, target cooling oil temperature at an oil pump inlet and optimal comprehensive energy consumption of the oil-cooled motor system.
And tenth, determining the lubricating demand flow of the oil-cooled motor system under the current working condition according to the rotating speed of the oil-cooled motor under the current working condition and the temperature of the cooling oil at the inlet of the current oil pump. Because friction and heat generation exist in the operation process of the oil-cooled motor system, the cooling oil needs to lubricate the oil-cooled motor system to avoid excessive wear of the system, so that the efficiency and the reliability of the system are improved; the flow of the lubrication demand of the oil-cooled motor system therefore needs to be taken into account.
The concrete mode is as follows: and inquiring a preset lubrication demand flow MAP (MAP) table according to the rotating speed of the oil-cooled motor and the temperature of the cooling oil at the inlet of the current oil pump under the current working condition to obtain the lubrication demand flow of the oil-cooled motor system under the current working condition. The preset lubrication demand flow MAP table is a corresponding relation table of the oil-cooled motor rotating speed, the cooling oil temperature at the oil pump inlet and the lubrication demand flow of the oil-cooled motor system, which is obtained in a calibration mode.
And step eleven, taking the larger value of the target cooling oil flow with the optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition and the lubricating demand flow of the oil-cooled motor system under the current working condition as the cooling oil flow demand value under the current working condition.
And step ten, determining the target control quantity of the flow of the cooling oil under the current working condition according to the required value of the flow of the cooling oil under the current working condition and the flow of the cooling oil with the external characteristic of the oil pump.
The specific steps of determining the target control quantity of the cooling oil flow under the current working condition (see fig. 4) include:
s1, judging whether the required value of the cooling oil flow under the current working condition is larger than the cooling oil flow of the external characteristic of the oil pump under the current working condition, if so, executing S2, otherwise, executing S3.
And S2, taking the flow of the cooling oil with the external characteristic of the oil pump under the current working condition as the target control quantity of the flow of the cooling oil under the current working condition, and then ending.
And S3, judging whether the required value of the cooling oil flow at the current moment is greater than that at the previous moment, if so, executing S4, otherwise, executing S5.
And S4, taking the required value of the cooling oil flow at the current moment as the target control quantity of the cooling oil flow under the current working condition, and then ending.
And S5, taking the required value of the flow rate of the cooling oil at the previous moment as the target control quantity of the flow rate of the cooling oil under the current working condition, maintaining the required value of the flow rate of the cooling oil for a preset time, taking the required value of the flow rate of the cooling oil at the current moment as the target control quantity of the flow rate of the cooling oil under the current working condition, and ending.
And step thirteen, determining the target rotating speed of the oil pump under the current working condition according to the temperature of the cooling oil at the inlet of the oil pump and the target control quantity of the flow of the cooling oil under the current working condition.
The concrete mode is as follows: and inquiring a preset oil pump rotating speed MAP table according to the temperature of the cooling oil at the inlet of the current oil pump and the target control quantity of the flow of the cooling oil under the current working condition to obtain the target rotating speed of the oil pump under the current working condition. The preset oil pump rotating speed MAP table is a corresponding relation table of the oil pump inlet cooling oil temperature, the cooling oil flow target control quantity and the oil pump target rotating speed, which are obtained in a calibration mode.
Claims (9)
1. A method of determining a target rotational speed of an oil pump of an oil-cooled motor cooling system, comprising:
acquiring the ambient temperature and the rotating speed of an oil-cooled motor, the torque of the oil-cooled motor, the stator voltage of the oil-cooled motor, the stator current of the oil-cooled motor, the stator temperature of the oil-cooled motor, the actual rotating speed of an oil pump and the current of the oil pump under the current working condition;
determining the heating power of the current oil-cooled motor system according to the ambient temperature, the rotating speed of the oil-cooled motor, the torque of the oil-cooled motor, the stator voltage of the oil-cooled motor and the stator current of the oil-cooled motor under the current working condition;
determining the equivalent temperature of the current oil-cooled motor according to the temperature of the stator of the oil-cooled motor under the current working condition, and obtaining the equivalent temperature change rate of the current oil-cooled motor by derivation of the equivalent temperature of the current oil-cooled motor;
determining the temperature of cooling oil at the inlet of the oil pump according to the actual rotating speed of the oil pump and the current of the oil pump under the current working condition;
inputting the heating power of the current oil-cooled motor system, the current oil-cooled motor equivalent temperature change rate and the current cooling oil temperature at the inlet of the oil pump into a one-dimensional heat management power consumption model, and outputting a cooling oil target temperature at the inlet of the oil pump and an oil-cooled motor target equivalent temperature change rate after calculation;
integrating the product of the target equivalent temperature change rate of the oil-cooled motor and the preset heat capacity of the oil-cooled motor with time to serve as a target heat storage amount;
taking the integral of the heating power of the current oil-cooled motor system to time as the current heating value;
taking the difference value between the current heating value and the target heat storage value as a target heat dissipation value;
determining the target cooling oil flow with optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition according to the target heat dissipation capacity and the target cooling oil temperature at the inlet of the oil pump;
determining the lubricating demand flow of the oil-cooled motor system under the current working condition according to the rotating speed of the oil-cooled motor under the current working condition and the temperature of the cooling oil at the inlet of the current oil pump;
taking the larger value of the target cooling oil flow and the lubricating demand flow as the cooling oil flow demand value under the current working condition;
determining a target control quantity of the flow of the cooling oil under the current working condition according to the required value of the flow of the cooling oil under the current working condition and the flow of the cooling oil with the external characteristic of the oil pump;
and determining the target rotating speed of the oil pump under the current working condition according to the temperature of the cooling oil at the inlet of the oil pump and the target control quantity of the flow of the cooling oil under the current working condition.
2. The method for determining the target rotating speed of the oil pump of the oil-cooled motor cooling system according to claim 1, wherein the specific manner for determining the heating power of the current oil-cooled motor system is as follows:
inquiring a preset oil-cooled motor system efficiency MAP table according to the ambient temperature, the oil-cooled motor rotating speed and the oil-cooled motor torque under the current working condition, and obtaining the efficiency value of the current oil-cooled motor system;
calculating to obtain the input power of the current oil-cooled motor system by using the stator voltage of the oil-cooled motor and the stator current of the oil-cooled motor under the current working condition;
using the formula: heating power = input power x (1-efficiency value), and calculating the heating power of the current oil-cooled motor system;
the preset efficiency MAP table of the oil-cooled motor system is a corresponding relation table of the environmental temperature, the rotating speed of the oil-cooled motor, the torque of the oil-cooled motor and the efficiency value of the oil-cooled motor system, which are obtained in a calibration mode.
3. The method for determining the target rotating speed of the oil pump of the oil-cooled motor cooling system according to claim 1 or 2, wherein the specific way for determining the equivalent temperature of the current oil-cooled motor is as follows:
inquiring a preset rotor temperature MAP table according to the oil-cooled motor stator temperature under the current working condition to obtain the oil-cooled motor rotor temperature under the current working condition;
adding the product of the cold motor stator temperature under the current working condition and the preset stator mass coefficient and the product of the oil-cooled motor rotor temperature under the current working condition and the preset rotor mass coefficient to obtain the equivalent temperature of the current oil-cooled motor;
the preset rotor temperature MAP table is a corresponding relation table of the oil-cooled motor stator temperature and the oil-cooled motor rotor temperature obtained in a calibration mode.
4. The method for determining the target rotating speed of the oil pump of the oil-cooled motor cooling system according to claim 3, wherein the specific manner for determining the target control quantity of the flow rate of the cooling oil under the current working condition comprises the following steps;
s1, judging whether the required value of the cooling oil flow under the current working condition is larger than the cooling oil flow of the external characteristic of the oil pump under the current working condition, if so, executing S2, otherwise, executing S3;
s2, taking the flow of the cooling oil with the external characteristic of the oil pump under the current working condition as the target control quantity of the flow of the cooling oil under the current working condition, and then ending;
s3, judging whether the required value of the cooling oil flow at the current moment is larger than that at the previous moment, if so, executing S4, otherwise, executing S5;
s4, taking the required value of the cooling oil flow at the current moment as the target control quantity of the cooling oil flow under the current working condition, and then ending;
and S5, taking the required value of the flow rate of the cooling oil at the previous moment as the target control quantity of the flow rate of the cooling oil under the current working condition, maintaining the required value of the flow rate of the cooling oil for a preset time, taking the required value of the flow rate of the cooling oil at the current moment as the target control quantity of the flow rate of the cooling oil under the current working condition, and ending.
5. The method for determining the target rotation speed of the oil pump of the oil-cooled motor cooling system according to claim 4, wherein the specific way of determining the temperature of the cooling oil at the current oil pump inlet is as follows:
inquiring a preset cooling oil temperature MAP table according to the actual rotating speed of the oil pump and the current of the oil pump under the current working condition to obtain the current cooling oil temperature at the inlet of the oil pump; the preset cooling oil temperature MAP table is a corresponding relation table of the actual rotating speed of the oil pump, the current of the oil pump and the temperature of the cooling oil at the inlet of the oil pump, which is obtained in a calibration mode.
6. The method for determining the target rotating speed of the oil pump of the oil-cooled motor cooling system according to claim 4, wherein the specific way for determining the target cooling oil flow with the optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition is as follows:
inquiring a preset cooling oil flow MAP table according to the target heat dissipation capacity and the target cooling oil temperature at the inlet of the oil pump, and obtaining the target cooling oil flow with optimal comprehensive energy consumption of the oil-cooled motor system under the current working condition;
the preset cooling oil flow MAP table is a corresponding relation table of target cooling oil flow obtained in a calibration mode, target cooling oil temperature at an oil pump inlet and optimal comprehensive energy consumption of the oil-cooled motor system.
7. The method for determining the target rotating speed of the oil pump of the oil-cooled motor cooling system according to claim 4, wherein the specific way for determining the lubrication demand flow of the oil-cooled motor system under the current working condition is as follows:
inquiring a preset lubrication demand flow MAP table according to the rotating speed of the oil-cooled motor under the current working condition and the temperature of cooling oil at the inlet of the current oil pump, and obtaining the lubrication demand flow of the oil-cooled motor system under the current working condition;
the preset lubrication demand flow MAP table is a corresponding relation table of the oil-cooled motor rotating speed, the cooling oil temperature at the oil pump inlet and the lubrication demand flow of the oil-cooled motor system, which is obtained in a calibration mode.
8. The method for determining the target rotating speed of the oil pump of the oil-cooled motor cooling system according to claim 4, wherein the specific manner for determining the target rotating speed of the oil pump under the current working condition is as follows:
inquiring a preset oil pump rotating speed MAP table according to the temperature of the cooling oil at the inlet of the current oil pump and the target control quantity of the flow of the cooling oil under the current working condition, and obtaining the target rotating speed of the oil pump under the current working condition;
the preset oil pump rotating speed MAP table is a corresponding relation table of the temperature of the cooling oil at the inlet of the oil pump, the target control quantity of the flow of the cooling oil and the target rotating speed of the oil pump, which is obtained in a calibration mode.
9. An oil-cooled motor cooling system comprises an oil-cooled motor system, a heat exchanger (1), an oil filter (2), an oil pump (3), an oil-cooled motor controller (5) and an oil pump controller (6), wherein the heat exchanger (1), the oil filter (2), the oil pump (3) and the oil-cooled motor system are communicated to form a cooling oil duct, the oil-cooled motor controller (5) is connected with the oil-cooled motor system and the oil pump controller (6), the oil pump controller (6) is connected with the oil pump (3), the oil-cooled motor controller (5) controls the oil-cooled motor system to work, determines the target rotating speed of the oil pump and sends the target rotating speed of the oil pump to the oil pump controller (6), and the oil pump controller (6) controls the oil pump (3) to run according to the target rotating speed of the oil pump so as to pump the cooling oil into the oil-cooled motor system to cool the oil-cooled motor system; the method is characterized in that: the oil-cooled motor controller (5) determines an oil pump target rotation speed using the determination method according to any one of claims 1 to 8.
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