CN111806222B - Motor loop cooling control method and system for new energy automobile - Google Patents
Motor loop cooling control method and system for new energy automobile Download PDFInfo
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- CN111806222B CN111806222B CN202010739149.7A CN202010739149A CN111806222B CN 111806222 B CN111806222 B CN 111806222B CN 202010739149 A CN202010739149 A CN 202010739149A CN 111806222 B CN111806222 B CN 111806222B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/06—Arrangement in connection with cooling of propulsion units with air cooling
Abstract
The invention discloses a motor loop cooling control method and a motor loop cooling control system of a new energy automobile, aiming at the control method, firstly, the real-time temperature of each component in a motor loop is obtained, the difference value of the real-time temperatures of each component in a preset time interval is calculated, and a cooling gear of a motor heat management loop is selected as a first difference cooling gear according to the difference value; then comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; and finally, comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor thermal management loop. Therefore, the motor loop cooling control method considers the temperature rise of real-time temperature of each component in the motor loop, determines a certain operation cooling gear of the motor heat management loop through the temperature rise, and avoids the problem of too fast temperature rise of the motor loop.
Description
Technical Field
The invention relates to the technical field of automobile motor cooling, in particular to a motor loop cooling control method and system for a new energy automobile.
Background
Nowadays, people pay more and more attention to energy consumption and safety problems of electric automobiles, when the electric automobiles run, a motor loop can generate a large amount of heat under high-load high-speed and climbing working conditions, and the temperature of a heat management loop is generally used as a unique control object to be controlled by the conventional heat management strategy.
The opening degree of a water pump and a fan is generally determined according to the temperature of a motor loop in the current whole vehicle control strategy, although the control can effectively avoid the condition that the temperature of the motor loop exceeds a control threshold value, the condition that the water pump and the fan are started under the condition that the water pump or the fan is not required to be started often occurs, and meanwhile, the condition that the temperature is heated too fast easily occurs.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the temperature control effect of motor loop cooling is poor, and the motor loop cooling and temperature rising are easy to be too fast.
In order to solve the technical problem, the embodiment of the invention discloses a motor loop cooling control method of a new energy automobile, wherein the automobile comprises a motor loop and a motor heat management loop; the system comprises a motor loop, a controller, a vehicle-mounted switching power supply and a vehicle-mounted charger, wherein the motor loop comprises a motor, a controller, a vehicle-mounted switching power supply and a vehicle-mounted charger, and the motor heat management loop comprises a water pump and a fan; the control method comprises the following steps:
s1: the method comprises the steps of obtaining real-time temperatures of all components in a motor loop, calculating the difference of the real-time temperatures of all the components in a preset time interval, and selecting a cooling gear of a motor heat management loop as a first difference cooling gear according to the difference;
s2: comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of a motor heat management loop as a second differential cooling gear according to the compared differential;
s3: comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor thermal management loop; wherein
The motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear respectively defines the output duty ratio of the water pump and the output duty ratio of the fan.
By adopting the technical scheme, the motor loop cooling control method of the new energy automobile disclosed by the invention comprises the steps of firstly obtaining the real-time temperatures of all components in a motor loop, calculating the difference value of the real-time temperatures of all the components in a preset time interval, and selecting a cooling gear of a motor heat management loop as a first difference cooling gear according to the difference value; then comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; finally, comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor heat management loop; the motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear defines the output duty ratio of the water pump and the output duty ratio of the fan respectively. Therefore, the motor loop cooling control method considers the temperature rise of real-time temperature of each component in the motor loop, determines a certain operation cooling gear of the motor heat management loop through the temperature rise, and avoids the problem of too fast temperature rise of the motor loop.
Further, after step S3, the method further includes the following steps:
s4: acquiring the current speed of the automobile, and acquiring the output duty ratio of the equivalent fan according to the current speed;
s5: obtaining the final output duty ratio of the water pump and the final output duty ratio of the fan according to the operation cooling gear of the motor heat management loop and the equivalent fan output duty ratio; wherein
The final output duty ratio of the water pump is defined by the operating cooling gear obtained in step S3;
the final output duty cycle of the fan is the difference between the fan output duty cycle defined by the operating cooling gear obtained in step S3 minus the equivalent fan output duty cycle.
Further, in step S1, the predetermined time interval is 1 to 3 minutes.
Further, the motor heat management loop is provided with 6 cooling gears, and the higher the cooling gears are, the higher the output duty ratio of the fan and the output duty ratio of the water pump are; comprises that
A first cooling gear, wherein the output duty ratio of the water pump is 25% and the output duty ratio of the fan is 0%;
a second cooling gear, wherein the output duty ratio of the water pump is 50% and the output duty ratio of the fan is 0%;
a third cooling gear, wherein the output duty cycle of the water pump is 75% and the output duty cycle of the fan is 0%;
a fourth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 0%;
a fifth cooling gear, wherein the output duty ratio of the water pump is 100% and the output duty ratio of the fan is 50%; and
and a sixth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 100%.
Further, the preset temperature threshold of the motor is in the range of 120-145 ℃.
Further, the current speed of the automobile and the output duty ratio of the equivalent fan are in a direct proportion relation.
Further, a controller of the automobile monitors and acquires real-time temperatures of all parts in the motor loop, calculates a difference value of the real-time temperatures of all parts in a preset time interval, and compares the real-time temperatures with a temperature threshold value; and is
The controller controls the water pump and the fan according to the final output duty ratio of the water pump and the final output duty ratio of the fan.
Further, in step S1, the larger the difference in the real-time temperatures of the respective components within the predetermined time interval, the higher the first differential cooling gear.
Further, in step S2, the smaller the difference between the real-time temperature and the temperature threshold, the higher the second differential cooling gear.
The embodiment of the invention also provides a motor loop cooling control system of the new energy automobile, wherein the automobile comprises a motor loop and a motor heat management loop; the system comprises a motor loop, a controller, a vehicle-mounted switching power supply, a vehicle-mounted charger and a temperature detector, wherein the motor loop comprises a motor, a controller, a vehicle-mounted switching power supply, a vehicle-mounted charger and a fan;
the temperature detector obtains real-time temperatures of all components in the motor loop and sends the real-time temperatures to the controller, the controller calculates a difference value of the real-time temperatures of all the components in a preset time interval, and a cooling gear of the motor heat management loop is selected as a first difference cooling gear according to the difference value;
the controller compares the real-time temperature with a preset temperature threshold, and selects a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential;
the controller compares the first differential cooling gear with the second differential cooling gear, and the higher gear of the first differential cooling gear and the second differential cooling gear is used as an operation cooling gear of the motor heat management loop; wherein
The motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear respectively defines the output duty ratio of the water pump and the output duty ratio of the fan.
By adopting the technical scheme, the motor loop cooling control system of the new energy automobile disclosed by the invention has the advantages that the temperature detector firstly obtains the real-time temperature of each part in the motor loop and sends the real-time temperature to the controller, the controller calculates the difference value of the real-time temperatures of each part in a preset time interval, and selects the cooling gear of the motor heat management loop as a first difference cooling gear according to the difference value; then comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; finally, comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor heat management loop; the motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear defines the output duty ratio of the water pump and the output duty ratio of the fan respectively. Therefore, the motor loop cooling control method considers the temperature rise of real-time temperature of each component in the motor loop, determines a certain operation cooling gear of the motor heat management loop through the temperature rise, and avoids the problem of too fast temperature rise of the motor loop.
The invention has the beneficial effects that:
the invention provides a motor loop cooling control method of a new energy automobile, which comprises the steps of firstly, acquiring real-time temperatures of all parts in a motor loop, calculating a difference value of the real-time temperatures of all parts in a preset time interval, and selecting a cooling gear of a motor heat management loop as a first difference cooling gear according to the difference value; then comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; finally, comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor heat management loop; the motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear defines the output duty ratio of the water pump and the output duty ratio of the fan respectively. Therefore, the motor loop cooling control method considers the temperature rise of real-time temperature of each component in the motor loop, determines a certain operation cooling gear of the motor heat management loop through the temperature rise, and avoids the problem of too fast temperature rise of the motor loop.
Drawings
Fig. 1 is a flowchart of a method for controlling cooling of a motor circuit of a new energy vehicle according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; 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 embodiment can be understood in specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
In order to solve the problems that the temperature control effect of cooling of a motor loop is poor and the cooling and heating of the motor loop are easy to be too fast in the prior art, as shown in fig. 1, the embodiment of the embodiment discloses a motor loop cooling control method of a new energy automobile, wherein the automobile comprises a motor loop and a motor heat management loop; the system comprises a motor loop, a controller, a vehicle-mounted switching power supply and a vehicle-mounted charger, wherein the motor loop comprises a motor, a controller, a vehicle-mounted switching power supply and a vehicle-mounted charger, and the motor heat management loop comprises a water pump and a fan; the control method comprises the following steps:
s1: the method comprises the steps of obtaining real-time temperatures of all parts in a motor loop, calculating a difference value of the real-time temperatures of all parts in a preset time interval, and selecting a cooling gear of a motor heat management loop as a first difference cooling gear according to the difference value. In step S1, the predetermined time interval is 1 to 3 minutes, which is specifically set according to actual needs, and this embodiment is not particularly limited.
Specifically, selecting the cooling gear of the thermal management circuit of the motor as the first differential cooling gear according to the difference is generally determined in a test process, for example, as shown in table 1 below:
TABLE 1
The temperature rise range and the gear can be determined by an engineer in a test to find an optimal range in which the temperature of the motor can be controlled. From the above table, it can be seen that the greater the difference in real-time temperatures of the various components over the predetermined time interval, the higher the first differential cooling gear.
S2: comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of a motor heat management loop as a second differential cooling gear according to the compared differential; and the smaller the difference between the real-time temperature and the temperature threshold value is, the higher the second differential cooling gear is. In this embodiment, the preset temperature threshold of the motor is in the range of 120 ℃ to 145 ℃. Specifically, the temperature threshold is a characteristic temperature of the motor itself, i.e., a temperature above which the motor fails. Generally, the temperature threshold of the motor is about 140 ℃, different motors may have differences, and the preset temperature threshold of the motor is not specifically limited in this embodiment.
S3: comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor thermal management loop; the motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear defines the output duty ratio of the water pump and the output duty ratio of the fan respectively.
For example, the motor thermal management loop has 6 cooling gears, and the higher the cooling gear is, the higher the output duty ratio of the fan and the output duty ratio of the water pump are; the cooling system comprises a first cooling gear, wherein the output duty ratio of a water pump is 25%, and the output duty ratio of a fan is 0%; a second cooling gear, wherein the output duty ratio of the water pump is 50% and the output duty ratio of the fan is 0%; a third cooling gear, wherein the output duty cycle of the water pump is 75% and the output duty cycle of the fan is 0%; a fourth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 0%; a fifth cooling gear, wherein the output duty ratio of the water pump is 100% and the output duty ratio of the fan is 50%; and a sixth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 100%.
In summary, in the motor circuit cooling control method for the new energy automobile disclosed in this embodiment, the real-time temperatures of the components in the motor circuit are first obtained, the difference between the real-time temperatures of the components in the preset time interval is calculated, and the cooling gear of the motor heat management circuit is selected as the first difference cooling gear according to the difference; then comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; finally, comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor heat management loop; the motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear defines the output duty ratio of the water pump and the output duty ratio of the fan respectively. Therefore, the motor loop cooling control method considers the temperature rise of real-time temperature of each component in the motor loop, determines a certain operation cooling gear of the motor heat management loop through the temperature rise, and avoids the problem of too fast temperature rise of the motor loop.
Further, after step S3, the method further includes the following steps:
s4: the current speed of the automobile is obtained, and the equivalent fan output duty ratio is obtained according to the current speed, so that the influence of the speed on a motor heat management loop can be further considered, and unnecessary energy consumption of the whole automobile can be reduced. Further, the current speed of the automobile and the output duty ratio of the equivalent fan are in a direct proportion relation.
Specifically, it is required to perform a real-time test to obtain an equivalent fan output duty ratio according to a current vehicle speed, and a simple explanation is that a certain wind speed exists after a vehicle is driven, and the rotational speed of a part of fans can be equivalent by using the part of wind speed, and the specific equivalent amount can be obtained, and the real-time test can be performed, the embodiment provides such a control method for reducing energy consumption, and the specific corresponding relationship is approximately as follows in table 2:
TABLE 2
The vehicles may have different positions of the cooling system, and the correspondence relationship is used as an example, and this embodiment is not particularly limited thereto.
S5: obtaining the final output duty ratio of the water pump and the final output duty ratio of the fan according to the operation cooling gear of the motor heat management loop and the equivalent fan output duty ratio; wherein
The final output duty ratio of the water pump is defined by the operating cooling gear obtained in step S3;
the final output duty cycle of the fan is the difference between the fan output duty cycle defined by the operating cooling gear obtained in step S3 minus the equivalent fan output duty cycle.
Further, a controller of the automobile monitors and acquires real-time temperatures of all parts in the motor loop, calculates a difference value of the real-time temperatures of all parts in a preset time interval, and compares the real-time temperatures with a temperature threshold value; and the controller controls the water pump and the fan according to the final output duty ratio of the water pump and the final output duty ratio of the fan.
Example 2
The embodiment also provides a motor loop cooling control system of the new energy automobile, wherein the automobile comprises a motor loop and a motor heat management loop; the system comprises a motor loop, a controller, a vehicle-mounted switching power supply, a vehicle-mounted charger and a temperature detector, wherein the motor loop comprises a motor, a controller, a vehicle-mounted switching power supply, a vehicle-mounted charger and a fan;
the temperature detector obtains real-time temperatures of all components in the motor loop and sends the real-time temperatures to the controller, the controller calculates a difference value of the real-time temperatures of all the components in a preset time interval, and a cooling gear of the motor heat management loop is selected as a first difference cooling gear according to the difference value;
the controller compares the real-time temperature with a preset temperature threshold, and selects a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential;
the controller compares the first differential cooling gear with the second differential cooling gear, and the higher gear of the first differential cooling gear and the second differential cooling gear is used as an operation cooling gear of the motor heat management loop; wherein
The motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear respectively defines the output duty ratio of the water pump and the output duty ratio of the fan.
In summary, in the motor circuit cooling control system of the new energy automobile disclosed in this embodiment, the temperature detector first obtains the real-time temperatures of the components in the motor circuit and sends the real-time temperatures to the controller, the controller calculates the difference between the real-time temperatures of the components in the predetermined time interval, and selects the cooling gear of the motor heat management circuit as the first difference cooling gear according to the difference; then comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; finally, comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor heat management loop; the motor thermal management circuit is provided with a plurality of cooling gears, and each cooling gear defines the output duty ratio of the water pump and the output duty ratio of the fan respectively. Therefore, the motor loop cooling control method considers the temperature rise of real-time temperature of each component in the motor loop, determines a certain operation cooling gear of the motor heat management loop through the temperature rise, and avoids the problem of too fast temperature rise of the motor loop.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Workers skilled in the art will recognize that changes may be made in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the invention.
Claims (6)
1. The cooling control method of the motor loop of the new energy automobile is characterized in that the new energy automobile comprises a motor loop and a motor heat management loop; the motor loop comprises a motor, a controller, a vehicle-mounted switching power supply and a vehicle-mounted charger, and the motor heat management loop comprises a water pump and a fan; wherein the control method comprises the following steps:
s1: acquiring real-time temperatures of all components in the motor loop, calculating a difference value of the real-time temperatures of all the components in a preset time interval, and selecting a cooling gear of the motor heat management loop as a first difference cooling gear according to the difference value; the preset time interval is 1-3 minutes;
s2: comparing the real-time temperature with a preset temperature threshold, and selecting a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; the preset temperature threshold of the motor is within the range of 120-145 ℃;
s3: comparing the first differential cooling gear with the second differential cooling gear, and taking the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor thermal management loop; wherein
The motor thermal management loop is provided with 6 cooling gears, and the higher the cooling gears are, the higher the output duty ratio of the fan and the output duty ratio of the water pump are; comprises that
A first cooling gear, wherein the output duty cycle of the water pump is 25% and the output duty cycle of the fan is 0%;
a second cooling gear, wherein the output duty cycle of the water pump is 50% and the output duty cycle of the fan is 0%;
a third cooling gear, wherein the output duty cycle of the water pump is 75% and the output duty cycle of the fan is 0%;
a fourth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 0%;
a fifth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 50%; and
a sixth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 100%;
s4: acquiring the current speed of the new energy automobile, and acquiring an equivalent fan output duty ratio according to the current speed;
s5: obtaining the final output duty ratio of the water pump and the final output duty ratio of the fan according to the operation cooling gear of the motor thermal management loop and the equivalent fan output duty ratio; wherein
The final output duty cycle of the water pump is defined by the operating cooling range obtained in the step S3;
the final output duty cycle of the fan is the difference between the fan output duty cycle defined by the operating cooling gear obtained in step S3 and the equivalent fan output duty cycle.
2. The motor circuit cooling control method of the new energy automobile as claimed in claim 1, wherein the current speed of the new energy automobile is in direct proportion to the equivalent fan output duty ratio.
3. The motor circuit cooling control method of the new energy automobile according to claim 2, wherein a controller of the new energy automobile monitors and acquires real-time temperatures of components in the motor circuit, calculates a difference between the real-time temperatures of the components in a predetermined time interval, and compares the real-time temperature with the temperature threshold; and is
The controller controls the water pump and the fan according to the final output duty ratio of the water pump and the final output duty ratio of the fan.
4. The motor circuit cooling control method of the new energy vehicle according to claim 3, wherein in step S1, the larger the difference in the real-time temperatures of the respective components within a predetermined time interval, the higher the first differential cooling gear is.
5. The motor circuit cooling control method of the new energy vehicle according to claim 4, wherein in step S2, the smaller the difference between the real-time temperature and the temperature threshold value is, the higher the second differential cooling gear is.
6. A motor loop cooling control system of a new energy automobile is characterized by comprising a motor loop and a motor heat management loop; the motor loop comprises a motor, a controller, a vehicle-mounted switching power supply, a vehicle-mounted charger and a temperature detector, and the motor heat management loop comprises a water pump and a fan;
the temperature detector obtains real-time temperatures of all components in the motor loop and sends the real-time temperatures to the controller, the controller calculates a difference value of the real-time temperatures of all the components in a preset time interval, and a cooling gear of the motor heat management loop is selected as a first difference cooling gear according to the difference value; the preset time interval is 1-3 minutes;
the controller compares the real-time temperature with a preset temperature threshold, and selects a cooling gear of the motor heat management loop as a second differential cooling gear according to the compared differential; the preset temperature threshold of the motor is within the range of 120-145 ℃;
the controller compares the first differential cooling gear with the second differential cooling gear, and takes the higher gear of the first differential cooling gear and the second differential cooling gear as an operation cooling gear of the motor thermal management loop; wherein
The motor thermal management loop is provided with 6 cooling gears, and the higher the cooling gears are, the higher the output duty ratio of the fan and the output duty ratio of the water pump are; comprises that
A first cooling gear, wherein the output duty cycle of the water pump is 25% and the output duty cycle of the fan is 0%;
a second cooling gear, wherein the output duty cycle of the water pump is 50% and the output duty cycle of the fan is 0%;
a third cooling gear, wherein the output duty cycle of the water pump is 75% and the output duty cycle of the fan is 0%;
a fourth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 0%;
a fifth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 50%; and
a sixth cooling gear, wherein the output duty cycle of the water pump is 100% and the output duty cycle of the fan is 100%;
the controller obtains the current speed of the new energy automobile, and obtains the equivalent fan output duty ratio according to the current speed;
the controller obtains a final output duty ratio of the water pump and a final output duty ratio of the fan according to the operation cooling gear of the motor heat management loop and the equivalent fan output duty ratio; wherein
A final output duty cycle of the water pump is defined by the operating cooling gear;
the final output duty cycle of the fan is the difference of the fan output duty cycle defined by the operating cooling gear minus the equivalent fan output duty cycle.
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|---|---|---|---|---|
| CN104808719A (en) * | 2015-03-12 | 2015-07-29 | 北京长安汽车工程技术研究有限责任公司 | Temperature control system and method |
| CN107472001A (en) * | 2016-12-08 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Control method, device and the vehicle of cooling water pump |
| CN107640017A (en) * | 2017-08-31 | 2018-01-30 | 北京新能源汽车股份有限公司 | Performance estimating method, device and the electric automobile of pure electric automobile liquid cooling system |
| CN111376709A (en) * | 2018-12-28 | 2020-07-07 | 长城汽车股份有限公司 | Vehicle heat dissipation control method and system |
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