CN111552331A - Cooling control method and cooling control system - Google Patents
Cooling control method and cooling control system Download PDFInfo
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- CN111552331A CN111552331A CN202010405858.1A CN202010405858A CN111552331A CN 111552331 A CN111552331 A CN 111552331A CN 202010405858 A CN202010405858 A CN 202010405858A CN 111552331 A CN111552331 A CN 111552331A
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Abstract
The invention provides a cooling control method and a cooling control system, which relate to the field of electric automobiles, and are characterized in that a cooling loop control system can judge and execute the response value of a database according to the actual situation by acquiring four variables of the temperature difference value of a motor winding and cooling liquid, the current magnitude of a stator winding, the temperature of the motor winding and the magnetic field frequency in real time and adjusting the flow of water and cold according to the four variables, so that the cooling effect is good, in addition, because the variables such as the current, the frequency, the temperature and the like can be detected and fed back in real time, the response speed is high, meanwhile, the cooling system is prevented from being in a high-level state for a long time, the method can solve the problems of low response speed and power consumption based on gear adjustment at present, can start from all variables influencing the flow magnitude of the cooling loop, carry out macroscopic adjustment on the cooling loop, and, is easier to realize on the vehicle.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a cooling control method and a cooling control system.
Background
In the market of pure electric cars at present, except that a driving motor system of an A00-grade car mostly adopts a surface cooling (namely air cooling) heat dissipation mode, driving motor systems of other car types generally adopt an internal cooling (namely liquid cooling) heat dissipation mode. The permanent magnet synchronous motor generally adopts a design scheme of a circumferential spiral water channel, and each motor manufacturer can adjust the density and the sectional area of the water channel according to the outer diameter size, the power grade and the like of each motor. The heat dissipation effect of the cooling system directly influences the service life and the rated capacity of the motor, and the cooling control technology has important significance for the use of the driving motor. The cooling control technology that most car enterprises adopted is to divide the motor temperature into two or three regions, and every temperature zone sets up one and keeps off fixed cooling liquid flow, in order to satisfy driving motor's heat dissipation demand as far as possible, long-time operation can increase the power consumptive of whole car at high-grade level, and in addition, current cooling system responds slowly, can not effectively protect the motor.
In view of this, it is important to design and manufacture a cooling control system that can solve the problems of slow response and power consumption, has a good cooling effect, and can effectively protect the motor.
Disclosure of Invention
The invention aims to provide a cooling control method which has good cooling effect and high response speed, avoids a cooling system from operating at a high level for a long time, reduces the power consumption and can effectively protect a motor.
Another object of the present invention is to provide a cooling control system, which has a good cooling effect, a fast response speed, and low power consumption, and can effectively protect a motor.
The invention is realized by adopting the following technical scheme.
In one aspect, the present invention provides a cooling control method for controlling a flow rate of a coolant for driving a motor, including the steps of:
acquiring first temperature data of a driving motor;
acquiring current data of a driving motor;
acquiring magnetic field frequency data of a driving motor;
acquiring second temperature data at a liquid inlet of the driving motor;
calculating to obtain temperature difference data according to the difference value of the first temperature data and the second temperature data;
and adjusting the flow of the cooling liquid of the driving motor according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data.
Further, the step of adjusting the flow of the coolant of the drive motor according to the first temperature data, the current data, the magnetic field frequency data, and the temperature difference data includes:
adjusting the rotating speed of the heat dissipation water pump according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data;
wherein the heat dissipation water pump is used for pumping cooling liquid to the driving motor.
Further, the step of adjusting the rotation speed of the heat dissipation water pump according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data comprises:
comparing the first temperature data with preset temperature data, and when the first temperature data is greater than or equal to the preset temperature data, driving the motor to be in a temperature alarm state; when the first temperature data is smaller than the preset temperature data, the driving motor is in a safe temperature state;
comparing the current data with preset current data, and when the current data is greater than or equal to the preset current data, driving the motor to be in an overcurrent state; when the current data is smaller than the preset current data, the driving motor is in a continuous current state;
comparing the temperature difference data with preset temperature difference data, and when the temperature difference data is greater than or equal to the preset temperature difference data, driving the motor to be in a low-temperature difference state; when the temperature difference data is smaller than the preset temperature difference data, the driving motor is in a high temperature difference state;
comparing the magnetic field frequency data with preset magnetic field frequency data, and when the magnetic field frequency data is greater than or equal to the preset magnetic field frequency data, driving the motor to be in a high-frequency state; when the magnetic field frequency data are smaller than the preset magnetic field frequency data, the driving motor is in a rated frequency state;
and adjusting the rotating speed of the heat dissipation water pump according to the state of the driving motor.
Further, the step of adjusting the rotation speed of a heat-radiating pump for pumping the cooling liquid to the driving motor according to the state of the driving motor includes:
when the driving motor is in a high-frequency state, controlling the rotating speed of the heat dissipation water pump to increase a first rotating speed;
when the driving motor is in a low temperature difference state, controlling the rotating speed of the heat dissipation water pump to increase by a second rotating speed;
when the driving motor is in an overcurrent state, controlling the rotating speed of the heat dissipation water pump to increase a third rotating speed;
when the driving motor is in a temperature alarm state, controlling the rotating speed of the heat dissipation water pump to increase a fourth rotating speed;
when the driving motor is in a rated frequency state, a high temperature difference state, a continuous current state and a safe temperature state, controlling the rotating speed of the heat-dissipating water pump to be a reference rotating speed, otherwise, controlling the rotating speed of the heat-dissipating water pump to increase at least one of a first rotating speed, a second rotating speed, a third rotating speed and a fourth rotating speed on the basis of the reference rotating speed;
the first rotating speed is less than the second rotating speed, the second rotating speed is less than the third rotating speed, and the third rotating speed is less than the fourth rotating speed.
Further, the second rotation speed is twice the first rotation speed, the third rotation speed is twice the second rotation speed, and the fourth rotation speed is twice the third rotation speed.
A cooling control system comprises a driving motor, a driving motor controller and a vehicle control unit, wherein the driving motor controller is connected with the driving motor, and the vehicle control unit is connected with the driving motor controller;
the driving motor controller is used for detecting a first temperature of the driving motor and generating first temperature data;
the driving motor controller is also used for detecting the current of the driving motor and generating current data;
the drive motor controller is also used for detecting the magnetic field frequency of the drive motor and generating magnetic field frequency data;
the driving motor controller is also used for detecting a second temperature of the liquid inlet of the driving motor and generating temperature difference data according to the difference value of the first temperature and the second temperature;
the vehicle control unit is used for adjusting the flow of the cooling liquid of the driving motor according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data.
Further, the driving motor controller comprises a first temperature sensor, a second temperature sensor, a Hall sensor, a rotary transformer and a signal acquisition and calculation unit, wherein the first temperature sensor, the second temperature sensor, the Hall sensor and the rotary transformer are all connected with the signal acquisition and calculation unit, and the signal acquisition and calculation unit is connected with the whole vehicle controller;
the first temperature sensor is arranged on a stator winding of the driving motor and used for detecting a first temperature of the stator winding and generating first temperature data;
the second temperature sensor is arranged at the liquid inlet of the driving motor, is connected with the first temperature sensor and is used for detecting a second temperature of the liquid inlet of the driving motor and generating a temperature difference signal according to a difference value of the first temperature and the second temperature;
the Hall sensor is arranged in the drive motor controller, electrically connected with the drive motor and used for detecting the current of the stator winding and generating current data;
the rotary transformer is arranged on the driving motor and used for calculating the magnetic field frequency of the driving motor.
Furthermore, the cooling control system further comprises a cooling loop and a heat dissipation water pump, the cooling loop is connected with the driving motor, the heat dissipation water pump is arranged on the cooling loop and used for pumping cooling liquid to the driving motor, the vehicle control unit is connected with the heat dissipation water pump, and the vehicle control unit is further used for adjusting the rotating speed of the heat dissipation water pump according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data.
Further, the cooling control system further comprises a cooling liquid tank, and the cooling liquid tank is arranged on the cooling circuit and used for supplying cooling liquid to the cooling circuit.
Furthermore, a radiator is arranged on the cooling liquid tank and used for radiating heat of the cooling liquid tank.
The invention has the following beneficial effects:
the invention provides a cooling control system and a cooling control method, which collect four variables of temperature difference of a motor winding and cooling liquid, stator winding current, motor winding temperature and magnetic field frequency in real time, the flow of the water and the cold can be adjusted according to the four variables, the cooling loop control system can judge the response value of the database according to the actual situation and execute the response value, the cooling effect is good, in addition, because the variables such as current, frequency, temperature and the like can be detected and fed back in real time, the response speed is high, meanwhile, the cooling system is prevented from being in a high-gear state for a long time, the method can solve the problems of low response speed and power consumption based on gear adjustment at present, and can start from all variables influencing the flow of the cooling loop, the device is macroscopically adjusted, overcomes the large inertia of nonlinear adjustment of the flow of the water channel, and is easier to realize on vehicles. Compared with the prior art, the cooling control method and the cooling control system provided by the invention have the advantages that the cooling effect is good, the response speed is high, the cooling system is prevented from operating at a high level for a long time, the power consumption is reduced, and the motor can be effectively protected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a cooling control system according to a first embodiment of the present invention;
FIG. 2 is a block diagram of a drive motor controller of FIG. 1;
fig. 3 is a block diagram illustrating steps of a cooling control method according to a second embodiment of the present invention.
Icon: 100-a cooling control system; 110-a drive motor; 130-drive motor controller; 131-a first temperature sensor; 133-a second temperature sensor; 135-hall sensor; 137-a rotary transformer; 139-signal acquisition and calculation unit; 150-vehicle control unit; 170-cooling circuit; 171-liquid cooling device; 180-heat dissipation water pump; 190-cooling liquid tank; 191-a radiator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships conventionally put on the products of the present invention when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.
First embodiment
Referring to fig. 1 and 2, the present embodiment provides a cooling control system 100, which has a good cooling effect, avoids being in a high-level state for a long time, reduces power consumption, saves electric energy, has a fast response speed, can rapidly cool a driving motor 110, and effectively protects the driving motor 110.
The cooling control system 100 provided in this embodiment includes a driving motor 110, a driving motor controller 130, and a vehicle controller 150, where the driving motor controller 130 is connected to the driving motor 110, and the vehicle controller 150 is connected to the driving motor controller 130; the driving motor controller 130 is configured to detect a first temperature of the driving motor 110 and generate first temperature data; the drive motor controller 130 is also configured to detect a current of the drive motor 110 and generate current data; the drive motor controller 130 is also configured to detect a magnetic field frequency of the drive motor 110 and generate magnetic field frequency data; the driving motor controller 130 is further configured to detect a second temperature of the liquid inlet of the driving motor 110, and generate temperature difference data according to a difference between the first temperature and the second temperature; the vehicle control unit 150 is configured to adjust a flow rate of the coolant of the driving motor 110 according to the first temperature data, the current data, the magnetic field frequency data, and the temperature difference data.
It should be noted that, in this embodiment, the first temperature data is temperature data of a stator winding, the current data is a stator current of the driving motor 110, 4 variables are used to adjust the flow rate in this embodiment, and the influence principle of the 4 variables is as follows:
the temperature of the stator windings of the drive motor 110 affects its life and safety, so the temperature value of the stator windings is one of the variables. In addition, in terms of heat generation of the driving motor 110, the driving motor 110 in this embodiment is a conventional permanent magnet synchronous motor, the main heat sources for generating heat in the permanent magnet synchronous motor are copper loss of the stator winding column and iron loss of the iron core, and the calculation formulas of the copper loss and the iron loss are as follows: p is a radical ofCu＝I2×R×t；
Finally, in view of heat conduction of the driving motor 110, the heat dissipation of the permanent magnet synchronous motor is divided into two types, namely radiation and convection, and the radiation heat dissipation has a smaller specific gravity and belongs to the motor property, so that the heat dissipation is not considered, and the convection heat dissipation is calculated by q ═ a × (theta is ×) (the company of calculation of theta is1-θ2) Wherein q is heat flow density, the product of the heat flow density and the flow rate is the heat dissipation capacity per unit time, a is the heat dissipation coefficient, and (theta)1-θ2) The temperature difference is one of the variables, namely the temperature difference between the winding of the motor and the cooling water path.
Further, the cooling control system 100 further includes a cooling circuit 170, a heat-dissipating water pump 180 and a cooling liquid tank 190, the cooling circuit 170 is connected to the driving motor 110, the heat-dissipating water pump 180 is disposed on the cooling circuit 170 and is configured to pump cooling liquid to the driving motor 110, the vehicle controller 150 is connected to the heat-dissipating water pump 180, and the vehicle controller 150 is further configured to adjust a rotation speed of the heat-dissipating water pump 180 according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data. The cooling control system 100 further includes a coolant tank 190, and the coolant tank 190 is provided on the cooling circuit 170 for supplying the coolant to the cooling circuit 170.
In the present embodiment, the cooling liquid is cooling water, and a cooling jacket is disposed on the driving motor 110, and the cooling jacket is connected to the cooling circuit 170, so that the cooling water can enter the cooling jacket to cool the driving motor 110. The inlet of the drive motor 110 is referred to herein as the inlet of the cooling jacket.
It should be noted that the cooling circuit 170 is a circulation pipeline, the cooling water in the cooling liquid tank 190 is conveyed to the driving motor 110 through the water inlet section of the cooling circuit 170 under the pumping action of the heat-dissipating water pump 180, and the cooling water after heat exchange with the driving motor 110 returns to the cooling liquid tank 190 through the water return section of the cooling circuit 170. The cooling circuit 170 is the same as a conventional cooling system and will not be described in detail.
In the present embodiment, the coolant tank 190 is provided with a radiator 191, and the radiator 191 is used to radiate heat from the coolant tank 190. When the temperature of the water returned from the driving motor 110 to the coolant tank 190 is high, the radiator 191 may be activated to cool the coolant tank 190, so that the temperature of the cooling water re-pumped to the driving motor 110 is low, which facilitates cooling of the driving motor 110.
In this embodiment, the driving motor controller 130 is used to collect four variables, i.e., current, temperature, magnetic field frequency, and temperature difference, related to the driving motor 110, and the four variables are used to calculate the flow rate of the cooling circuit 170 of the driving motor 110, since the four variables can be detected and fed back, the corresponding speed of the whole system is fast, and meanwhile, the flow rate of the cooling circuit 170 is prevented from being in a high-level state all the time, so that the energy consumption is saved, and the driving motor 110 is effectively protected.
The driving motor controller 130 comprises a first temperature sensor 131, a second temperature sensor 133, a hall sensor 135, a rotary transformer 137 and a signal acquisition and calculation unit 139, wherein the first temperature sensor 131, the second temperature sensor 133, the hall sensor 135 and the rotary transformer 137 are all connected with the signal acquisition and calculation unit 139, and the signal acquisition and calculation unit 139 is connected with the vehicle controller 150; the first temperature sensor 131 is disposed on the stator winding of the driving motor 110, and is configured to detect a first temperature of the stator winding and generate first temperature data; the second temperature sensor 133 is disposed at the liquid inlet of the driving motor 110, connected to the first temperature sensor 131, and configured to detect a second temperature of the liquid inlet of the driving motor 110 and generate a temperature difference signal according to a difference between the first temperature and the second temperature; a hall sensor 135 disposed in the driving motor controller 130 and electrically connected to the driving motor 110 for detecting a current of the stator winding and generating current data; a resolver 137 is provided on the driving motor 110 for calculating a magnetic field frequency of the driving motor 110.
In this embodiment, the second temperature sensor 133 is configured to detect the temperature of the cooling liquid in the cooling circuit 170, the signal acquisition and calculation unit 139 can receive data information acquired by each sensor and send the data information to the vehicle control unit 150 in a summary manner, the vehicle control unit 150 is provided with a calculation and analysis module therein, and can compare and calculate 4 variables, and finally adjust the rotation speed of the heat dissipation water pump 180 according to actual data of the 4 variables, thereby adjusting the flow rate of the cooling liquid. Specifically, the calculation and analysis module is provided with 4 corresponding standard quantities, and when at least one of the 4 variables exceeds the corresponding standard quantity, the rotating speed of the heat dissipation water pump 180 is controlled to be increased, the cooling flow is increased, and the variables exceeding the standard can be quickly reduced.
In the present embodiment, the hall sensor 135 is an open-loop current sensor having a function of detecting a current value, and for the detection principle thereof, reference is made to the existing hall sensor 135.
In the present embodiment, a liquid cooling device 171 is further provided on the cooling circuit 170, and is disposed between the heat-dissipating water pump 180 and the drive motor 110.
In summary, in the cooling control system 100 provided in this embodiment, the rotation speed of the heat dissipation water pump 180 is adjusted according to the comparison result between the 4 variables and the standard value by acquiring the first temperature data, the current data, and the magnetic field frequency data, and meanwhile, the signal acquisition and calculation unit 139 can pre-determine the temperature change according to the actual situation and make a macroscopic adjustment, so as to accurately adjust the flow rate of the cooling liquid, improve the cooling effect, and effectively protect the driving motor 110. In addition, through the regulation of flow, avoided heat dissipation water pump 180 to be in high-grade state all the time, avoided the waste of electric quantity, 4 variables can real-time detection, and response speed is fast.
Second embodiment
Referring to fig. 3, the present embodiment provides a cooling control method, which is applied to the cooling control system 100 provided in the first embodiment, for controlling the flow rate of the cooling liquid for driving the motor 110, and includes the following steps:
s1: first temperature data of the driving motor 110 is acquired.
Specifically, the temperature of the driving motor 110 is acquired by the first temperature sensor 131 provided on the stator winding of the driving motor 110, and first temperature data is generated and transmitted to the signal acquisition and calculation unit 139.
S2: current data of the driving motor 110 is acquired.
Specifically, the stator current of the driving motor 110 is collected by a hall sensor 135 disposed in the driving motor controller 130 and electrically connected to the driving motor 110, and current data is generated according to the stator current and transmitted to the signal collection and calculation unit 139.
S3: magnetic field frequency data of the drive motor 110 is acquired.
Specifically, the magnetic field frequency of the drive motor 110 is detected by the resolver 137 provided on the drive motor 110, and the generated magnetic field frequency data is transmitted to the signal acquisition and calculation unit 139.
S4: and acquiring second temperature data at the liquid inlet of the driving motor 110, and calculating to obtain temperature difference data according to the difference value of the first temperature data and the second temperature data.
Specifically, the temperature of the cooling liquid in the cooling circuit 170 is collected by a second temperature sensor 133 disposed at the liquid inlet of the driving motor 110, and second temperature data is generated, and the second temperature sensor 133 is further connected to the first temperature sensor 131, and is configured to calculate temperature difference data according to a difference between the first temperature data and the second temperature data and transmit the temperature difference data to the signal collecting and calculating unit 139.
S5: the flow rate of the coolant for the driving motor 110 is adjusted according to the first temperature data, the current data, the magnetic field frequency data, and the temperature difference data.
Specifically, the vehicle control unit 150 adjusts the rotation speed of the heat dissipation water pump 180 according to the first temperature data, the current data, the magnetic field frequency data, and the temperature difference data, wherein the heat dissipation water pump 180 is configured to pump the cooling fluid to the driving motor 110.
In this embodiment, a database is built in the signal acquisition and calculation unit 139, preset temperature data, preset current data, preset temperature difference data, and preset magnetic field frequency data are set in the database, the preset data are used as standard data, and the severity of each variable is divided into two regions for analysis by comparing the first temperature data, the current data, the temperature difference data, and the magnetic field frequency data with the standard data. Specifically, comparing the first temperature data with the preset temperature data, when the first temperature data is greater than or equal to the preset temperature data, the driving motor 110 is in a temperature alarm state; when the first temperature data is less than the preset temperature data, the driving motor 110 is in a safe temperature state. Comparing the current data with the preset current data, and when the current data is greater than or equal to the preset current data, the driving motor 110 is in an overcurrent state; when the current data is less than the preset current data, the driving motor 110 is in a continuous current state. Comparing the temperature difference data with preset temperature difference data, and when the temperature difference data is greater than or equal to the preset temperature difference data, driving the motor 110 to be in a low temperature difference state; when the temperature difference data is less than the preset temperature difference data, the driving motor 110 is in a high temperature difference state. Comparing the magnetic field frequency data with the preset magnetic field frequency data, and when the magnetic field frequency data is greater than or equal to the preset magnetic field frequency data, driving the motor 110 to be in a high-frequency state; when the magnetic field frequency data is less than the preset magnetic field frequency data, the driving motor 110 is in a rated frequency state. Finally, the rotation speed of the heat-radiating water pump 180 is adjusted according to the state of the driving motor 110.
Further, the step of adjusting the rotation speed of the heat dissipation water pump 180 according to the state of the driving motor 110 specifically includes:
when the driving motor 110 is in a high-frequency state, controlling the rotation speed of the heat dissipation water pump 180 to increase by a first rotation speed; when the driving motor 110 is in a low temperature difference state, controlling the rotation speed of the heat dissipation water pump 180 to increase by a second rotation speed; when the driving motor 110 is in an overcurrent state, controlling the rotating speed of the heat dissipation water pump 180 to increase by a third rotating speed; when the driving motor 110 is in the temperature alarm state, controlling the rotating speed of the heat dissipation water pump 180 to increase by a fourth rotating speed; when the driving motor 110 is in a rated frequency state, a high temperature difference state, a continuous current state and a safe temperature state, controlling the rotating speed of the heat-dissipating water pump 180 to a reference rotating speed, otherwise, controlling the rotating speed of the heat-dissipating water pump 180 to increase at least one of a first rotating speed, a second rotating speed, a third rotating speed and a fourth rotating speed on the basis of the reference rotating speed; the first rotating speed is less than the second rotating speed, the second rotating speed is less than the third rotating speed, and the third rotating speed is less than the fourth rotating speed.
It should be noted that, when all of the 4 variables are smaller than the standard value, the cooling flow demand of the driving motor 110 is the lowest, the heat dissipation water pump 180 may be controlled to operate at a lower rotation speed, and the rotation speed at this time is set as the reference rotation speed, when any one variable exceeds the standard value, the rotation speed of the heat dissipation water pump 180 is correspondingly increased, and when any two variables exceed the standard value, the rotation speed of the heat dissipation water pump 180 is correspondingly increased twice.
In the present embodiment, the second rotation speed is twice the first rotation speed, the third rotation speed is twice the second rotation speed, and the fourth rotation speed is twice the third rotation speed. That is, the temperature of the driving motor 110 has the greatest influence on the heat radiation water pump 180 and the influence of the magnetic field frequency is minimized.
It should be noted that, in the present embodiment, the actual state of the driving motor 110 is determined according to two states of 4 variables, which are 16 actual states, specifically, see table 1 below, where each actual state corresponds to the rotation speed of one gear, and the rotation speed 16 increases to the rotation speed 1 in sequence. Of course, the relationship between the rotational speeds herein is merely illustrative and not limiting.
TABLE 1
If the waterway control precision is further refined, the membership degree of each variable to each area can be calculated, and the flow demand can be calculated according to the membership degree. In this method, a heat dissipation data test of the driving motor 110 is required, and influence coefficients of various variables on the flow rate of the heat dissipation water path are counted, so that the cooling water path control technology of the driving motor 110 can be further refined, which is not described in detail herein.
It should be noted that, in this embodiment, the standard values of the variables, that is, the preset temperature data, the preset current data, the preset temperature difference data, and the preset magnetic field frequency data, are determined by the attributes of the driving motor 110, and the motor is designed to perform thermal simulation and experiment, so as to determine the severity according to the data.
In the embodiment, a certain vehicle type is taken as a research object, the safe temperature area of the temperature value of the stator winding of the driving motor 110 is from the local atmospheric temperature to 140 ℃, and the temperature alarm area is from 140 ℃ to 160 ℃ (the highest shutdown temperature); the continuous current region of the stator current (effective value) is 0A to 130A, and the overcurrent region is 130A to 230A; the rated frequency range of the frequency is 0Hz to 270Hz, and the high frequency range is 270Hz to 800 Hz; the low temperature difference region of the temperature difference is 0 to 75 ℃, and the high temperature difference region is 75 ℃ to 95 ℃. The influence degree of the four variables on the flow of the cooling water channel is sequentially a stator winding temperature value, a stator current, a temperature difference and a frequency from strong to weak, so that the four variables can be arranged and combed according to a table 1, the rotating speed of the cooling water pump is calculated according to the area where each variable is located, 16 rotating speed points are counted, the rotating speed is sequentially increased from the rotating speed 16 to the rotating speed 1, and the rotating speed 1 is the highest rotating speed of the cooling water pump. The method adjusts the cooling flow, can adjust the flow in advance according to heat dissipation factors and heating factors, and can also divide the flow into 16 points to finely adjust the flow of a water channel.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cooling control method for controlling a flow rate of a coolant for driving a motor, comprising the steps of:
acquiring first temperature data of the driving motor;
acquiring current data of the driving motor;
acquiring magnetic field frequency data of the driving motor;
acquiring second temperature data at a liquid inlet of the driving motor;
calculating to obtain temperature difference data according to the difference value of the first temperature data and the second temperature data;
and adjusting the flow of the cooling liquid of the driving motor according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data.
2. The cooling control method according to claim 1, wherein the step of adjusting the flow rate of the coolant of the drive motor in accordance with the first temperature data, the current data, the magnetic field frequency data, and the temperature difference data includes:
adjusting the rotating speed of a heat dissipation water pump according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data;
wherein the heat dissipation water pump is used for pumping cooling liquid to the driving motor.
3. The cooling control method according to claim 2, wherein the step of adjusting the rotation speed of the heat-radiating water pump in accordance with the first temperature data, the current data, the magnetic field frequency data, and the temperature difference data includes:
comparing the first temperature data with preset temperature data, and when the first temperature data is greater than or equal to the preset temperature data, enabling the driving motor to be in a temperature alarm state; when the first temperature data is smaller than the preset temperature data, the driving motor is in a safe temperature state;
comparing the current data with preset current data, and when the current data is greater than or equal to the preset current data, enabling the driving motor to be in an overcurrent state; when the current data is smaller than the preset current data, the driving motor is in a continuous current state;
comparing the temperature difference data with preset temperature difference data, and when the temperature difference data is greater than or equal to the preset temperature difference data, enabling the driving motor to be in a low-temperature difference state; when the temperature difference data is smaller than the preset temperature difference data, the driving motor is in a high temperature difference state;
comparing the magnetic field frequency data with preset magnetic field frequency data, and when the magnetic field frequency data is greater than or equal to the preset magnetic field frequency data, enabling the driving motor to be in a high-frequency state; when the magnetic field frequency data are smaller than the preset magnetic field frequency data, the driving motor is in a rated frequency state;
and adjusting the rotating speed of the heat dissipation water pump according to the state of the driving motor.
4. The cooling control method according to claim 3, wherein the step of adjusting the rotation speed of the heat dissipation water pump in accordance with the state of the drive motor includes:
when the driving motor is in a high-frequency state, controlling the rotating speed of the heat dissipation water pump to increase a first rotating speed;
when the driving motor is in a low temperature difference state, controlling the rotating speed of the heat dissipation water pump to increase by a second rotating speed;
when the driving motor is in an overcurrent state, controlling the rotating speed of the heat dissipation water pump to increase by a third rotating speed;
when the driving motor is in a temperature alarm state, controlling the rotating speed of the heat dissipation water pump to increase by a fourth rotating speed;
when the driving motor is in a rated frequency state, a high temperature difference state, a continuous current state and a safe temperature state, controlling the rotating speed of the heat dissipation water pump to be a reference rotating speed, otherwise, controlling the rotating speed of the heat dissipation water pump to increase at least one of the first rotating speed, the second rotating speed, the third rotating speed and the fourth rotating speed on the basis of the reference rotating speed;
wherein the first rotational speed is less than the second rotational speed, the second rotational speed is less than the third rotational speed, and the third rotational speed is less than the fourth rotational speed.
5. The cooling control method according to claim 4, characterized in that the second rotational speed is twice the first rotational speed, the third rotational speed is twice the second rotational speed, and the fourth rotational speed is twice the third rotational speed.
6. A cooling control system is characterized by comprising a driving motor, a driving motor controller and a vehicle control unit, wherein the driving motor controller is connected with the driving motor, and the vehicle control unit is connected with the driving motor controller;
the driving motor controller is used for detecting a first temperature of the driving motor and generating first temperature data;
the driving motor controller is also used for detecting the current of the driving motor and generating current data;
the drive motor controller is also used for detecting the magnetic field frequency of the drive motor and generating magnetic field frequency data;
the driving motor controller is also used for detecting a second temperature of a liquid inlet of the driving motor and generating temperature difference data according to a difference value of the first temperature and the second temperature;
the vehicle control unit is used for adjusting the flow of the cooling liquid of the driving motor according to the first temperature data, the current data, the magnetic field frequency data and the temperature difference data.
7. The cooling control system according to claim 6, wherein the driving motor controller comprises a first temperature sensor, a second temperature sensor, a Hall sensor, a rotary transformer and a signal acquisition and calculation unit, the first temperature sensor, the second temperature sensor, the Hall sensor and the rotary transformer are all connected with the signal acquisition and calculation unit, and the signal acquisition and calculation unit is connected with the vehicle control unit;
the first temperature sensor is arranged in the driving motor controller, is electrically connected with the driving motor, and is used for detecting a first temperature of a stator winding of the driving motor and generating first temperature data;
the second temperature sensor is arranged at the liquid inlet of the driving motor, is connected with the first temperature sensor and is used for detecting a second temperature of the liquid inlet of the driving motor and generating a temperature difference signal according to a difference value of the first temperature and the second temperature;
the Hall sensor is arranged on the driving motor and used for detecting the current of the stator winding and generating current data;
the rotary transformer is arranged on the driving motor and used for calculating the magnetic field frequency of the driving motor.
8. The cooling control system according to claim 6, further comprising a cooling circuit and a heat dissipation water pump, wherein the cooling circuit is connected to the driving motor, the heat dissipation water pump is disposed on the cooling circuit and used for pumping cooling liquid to the driving motor, the vehicle controller is connected to the heat dissipation water pump, and the vehicle controller is further configured to adjust a rotation speed of the heat dissipation water pump according to the first temperature data, the current data, the magnetic field frequency data, and the temperature difference data.
9. The cooling control system of claim 8, further comprising a coolant tank disposed on the cooling circuit for providing coolant to the cooling circuit.
10. The cooling control system according to claim 9, wherein a radiator is provided on the coolant tank, the radiator being configured to radiate heat from the coolant tank.
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| CN111552331B (en) | 2021-09-17 |
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Effective date of registration: 20211230 Address after: 450000 No. 1689, hanghai East Road, Zhengzhou Economic and Technological Development Zone, Zhengzhou, Henan Province Patentee after: HAIMA NEW ENERGY VEHICLE Co.,Ltd. Patentee after: HAIMA MOTOR Corp. Patentee after: Hainan Haima Automobile Co.,Ltd. Address before: No.1689, hanghai East Road, Zhengzhou Economic and Technological Development Zone, Henan 450000 Patentee before: HAIMA NEW ENERGY VEHICLE Co.,Ltd. Patentee before: Haima Automobile Co., Ltd |
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