CN115230535A - Temperature control method and device for power system, vehicle and storage medium - Google Patents
Temperature control method and device for power system, vehicle and storage medium Download PDFInfo
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- CN115230535A CN115230535A CN202210395961.1A CN202210395961A CN115230535A CN 115230535 A CN115230535 A CN 115230535A CN 202210395961 A CN202210395961 A CN 202210395961A CN 115230535 A CN115230535 A CN 115230535A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2045—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for optimising the use of energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/425—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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Abstract
The invention provides a temperature control method and device of a power system, a vehicle and a storage medium, and relates to the technical field of vehicle thermal management. The method comprises the following steps: firstly, acquiring the current working temperature of a motor loop and the current working temperature of a battery loop, and then determining whether the temperature exchange requirement exists in the battery loop according to the temperature interval to which the current working temperature of the battery loop belongs; under the condition that the temperature exchange requirement of the battery loop is determined, the target opening degree of the proportional valve is determined according to the current working temperature of the battery loop and the current working temperature of the motor loop, and finally, the opening degree of the proportional valve is adjusted to the target opening degree, so that the motor loop and the battery loop can exchange cooling liquid. The opening degree of the proportional valve is determined according to the temperatures of the motor loop and the battery loop, mutual energy compensation of the motor loop and the battery loop is achieved, energy of the vehicle is not consumed additionally to meet energy consumption requirements of the battery loop and the motor loop, and the endurance mileage of the vehicle is improved.
Description
Technical Field
The invention relates to the technical field of vehicle thermal management, in particular to a temperature control method and device of a power system, a vehicle and a storage medium.
Background
For the thermal management of a battery loop of a vehicle, a battery water pump and a PTC heater are generally adopted to heat coolant of a motor loop to meet the heating requirement of the battery, and the coolant of the motor loop is cooled by the battery water pump and a compressor to meet the cooling requirement of the battery. For the heat management of the motor loop of the vehicle, the cooling liquid of the motor loop is heated by adopting a motor active heating mode to meet the heating requirement of the motor, and the cooling liquid of the motor loop is cooled by adopting a motor water pump and a fan to meet the cooling requirement of the motor.
In the related art, the heat management requirements of all parts are met through the independent motor loop and the independent battery loop, and under some special working conditions, the energy consumption of the independent motor loop and the independent battery loop is large, so that the driving mileage of the whole vehicle is influenced.
Disclosure of Invention
The embodiment of the invention provides a temperature control method and device of a power system, a vehicle and a storage medium, and aims to solve or partially solve the problem that the energy consumption is higher under some special working conditions in the existing independent motor loop and battery loop.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a temperature control method for a power system, where the method is applied to a controller, the controller is used to control a proportional valve, and the proportional valve is used to connect a motor loop and a battery loop, and the method includes:
acquiring the current working temperature of a motor loop and the current working temperature of a battery loop;
determining whether a temperature exchange requirement exists in the battery loop according to a temperature interval to which the current working temperature of the battery loop belongs;
under the condition that the temperature exchange requirement of the battery loop is determined, determining the target opening degree of the proportional valve according to the current working temperature of the battery loop and the current working temperature of the motor loop;
and adjusting the opening degree of the proportional valve to a target opening degree so as to exchange the cooling liquid between the motor loop and the battery loop.
Optionally, determining whether there is a temperature exchange requirement of the battery circuit according to the temperature interval to which the current operating temperature of the battery circuit belongs includes:
determining a temperature interval of a battery loop to which the current working temperature of the battery loop belongs according to a corresponding relation between the current working temperature of the battery loop and the temperature interval of the battery loop, wherein the temperature interval of the battery loop at least comprises a low temperature interval, an optimal working temperature interval and a high temperature interval from low to high;
if the temperature interval to which the battery loop belongs is a high-temperature interval or a low-temperature interval, determining that the temperature exchange requirement exists in the battery loop;
and if the temperature interval to which the battery loop belongs is the optimal working temperature interval, determining that the temperature exchange requirement of the battery loop does not exist.
Optionally, determining the target opening degree of the proportional valve according to the current operating temperature of the battery circuit and the current operating temperature of the motor circuit includes:
and searching a preset proportional valve opening calibration table by taking the current working temperature of the battery loop and the current working temperature of the motor loop as indexes, and determining the target opening of the proportional valve by combining an interpolation algorithm.
Optionally, the method further comprises:
in the case where it is determined that there is no temperature exchange demand of the battery circuit, the target opening degree of the proportional valve is determined to be zero.
Optionally, before determining the target opening degree of the proportional valve according to the current operating temperature of the battery circuit and the current operating temperature of the motor circuit, the method further comprises:
and if the temperature interval to which the battery loop belongs is a low-temperature interval or a high-temperature interval, determining whether the motor loop has the temperature compensation capacity for the battery loop or not according to the current working temperature of the motor loop, and determining that the target opening of the proportional valve is zero.
Optionally, determining a motor loop temperature interval to which the motor loop belongs according to a corresponding relation between the current working temperature of the motor loop and the temperature interval of the motor loop, wherein the temperature interval of the motor loop comprises a low temperature interval, an optimal working temperature interval and a high temperature interval from low to high;
if the temperature interval to which the battery loop belongs is a low-temperature interval and the temperature interval to which the motor loop belongs is a low-temperature interval, determining that the motor loop does not have the compensation capacity for the battery loop; and/or
And if the temperature interval to which the battery loop belongs is a high-temperature interval and the temperature interval to which the motor loop belongs is a high-temperature interval, determining that the motor loop does not have the compensation capability for the battery loop.
In a second aspect, an embodiment of the present invention provides a temperature control apparatus for a power system, where the apparatus includes:
the acquisition unit is used for acquiring the current working temperature of the motor loop and the current working temperature of the battery loop;
the first determining unit is used for determining whether the temperature exchange requirement exists in the battery loop according to the temperature interval to which the current working temperature of the battery loop belongs;
the second determining unit is used for determining the target opening degree of the proportional valve according to the current working temperature of the battery loop and the current working temperature of the motor loop under the condition that the temperature exchange requirement of the battery loop is determined;
and the adjusting unit is used for adjusting the opening of the proportional valve to a target opening so as to exchange the cooling liquid between the motor loop and the battery loop.
Optionally, the second determining unit includes:
and the calculating subunit is used for searching a preset proportional valve opening calibration table by taking the current working temperature of the battery loop and the current working temperature of the motor loop as indexes, and determining the target opening of the proportional valve by combining an interpolation algorithm.
In a third aspect, the present application further provides a vehicle comprising: the system comprises a motor loop, a battery loop, a proportional valve and a controller;
the proportional valve is used for connecting the motor loop and the battery loop;
the controller is used for controlling the proportional valve, and the proportional valve is used for connecting the motor loop and the battery loop;
the controller is configured to perform the method steps of the first aspect of the embodiments of the present application.
In a fourth aspect, the present application also provides a computer-readable storage medium having stored thereon instructions which, when executed by a controller, cause the controller to perform the method steps as in the first aspect of an embodiment of the present application.
The embodiment of the invention has the following advantages: firstly, acquiring the current working temperature of a motor loop and the current working temperature of a battery loop, and then determining whether the temperature exchange requirement exists in the battery loop according to the temperature interval to which the current working temperature of the battery loop belongs; under the condition that the temperature exchange requirement of the battery loop is determined, the target opening degree of the proportional valve is determined according to the current working temperature of the battery loop and the current working temperature of the motor loop, and finally, the opening degree of the proportional valve is adjusted to the target opening degree, so that the motor loop and the battery loop can exchange cooling liquid. According to the invention, the opening degree of the proportional valve is adjusted according to the temperatures of the motor loop and the battery loop, the condition conduction of the motor loop and the battery loop is realized, and the mutual exchange and mutual compensation of the heat of the motor loop and the heat of the battery loop are realized, so that the temperatures of the battery loop and the motor loop are in a normal range, and the heat management requirements of the battery loop and the motor loop are not met by additionally consuming the energy of a vehicle, thereby reducing the energy consumption of the vehicle and improving the endurance mileage of the vehicle.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a vehicle thermal management system according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating steps of a method for controlling temperature of a powertrain system in accordance with an embodiment of the present invention;
FIG. 3 is a flowchart illustrating steps of a method for determining a compensation capability of a motor loop with respect to a battery loop according to an embodiment of the present invention;
FIG. 4 is a block diagram of a temperature control device of a powertrain system in accordance with an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the correlation technique, motor circuit and battery circuit are independent each other, consequently, under special some operating modes, can make the energy consumption of vehicle great, as the example, and the thermal management demand when motor circuit is the heating demand, and the thermal management demand of battery circuit is the cooling demand, and under this operating mode, the vehicle can provide the required energy of motor circuit heating demand and the required energy of battery circuit cooling demand respectively to make the whole car energy consumption increase of vehicle, thereby influence the continuation of the journey mileage of vehicle.
In order to fully the energy of motor circuit and battery circuit, reduce the whole car energy consumption of vehicle under special operating mode, improve the continuation of the journey mileage of vehicle, this application is connected motor and battery circuit through the proportional valve, during the driving, according to the temperature of motor circuit and battery circuit, carries out accurate control to the aperture of proportional valve.
A first aspect of an embodiment of the present application provides a vehicle thermal management system, as shown in fig. 1, including a motor circuit and a battery circuit, where the battery circuit is used for performing thermal management on a vehicle battery, the motor circuit is used for performing thermal management on a vehicle motor, the motor circuit and the battery circuit are connected through a proportional valve, and a controller of a vehicle adjusts valve openings of the proportional valve according to actual temperatures of the motor circuit and the battery circuit, so that cooling fluids of the motor circuit and the battery circuit can flow through each other, and heat exchange and temperature compensation are achieved.
The embodiment discloses a temperature control method of a power system, which is used for showing specific steps of how a controller adjusts the valve opening of a proportional valve based on the actual temperatures of a motor loop and a battery loop, and as shown in fig. 2, the specific steps include:
s201: and acquiring the current working temperature of the motor loop and the current working temperature of the battery loop.
In the present embodiment, the coolant in the motor circuit and the coolant in the battery circuit are caused to flow through the motor circuit and the battery circuit, respectively, by the driving motor, thereby achieving circuit exchange. Before the opening degree control of the proportional valve is not determined, the proportional valve is normally closed, namely the opening degree of the proportional valve is 0, so that the motor circuit and the battery circuit are still independent from each other and operate respectively. A first temperature sensor for collecting a coolant temperature of the battery circuit may be provided in the battery circuit, and a second temperature sensor for collecting a coolant temperature of the motor circuit may be provided in the motor circuit. And recording the current working temperature T1 of the battery loop acquired by the first temperature sensor and recording the current working temperature T2 of the motor loop acquired by the second temperature sensor. And taking the current working temperature T1 of the battery loop and the current working temperature T2 of the motor loop as initial data for determining the valve opening of the proportional valve.
S202: and determining whether the temperature exchange requirement exists in the battery loop according to the temperature interval to which the current working temperature of the battery loop belongs.
In this embodiment, after the current operating temperature T1 of the battery circuit is acquired, whether the battery circuit has a corresponding temperature exchange requirement is determined according to the corresponding relationship between the current operating temperature T1 and the temperature interval of the battery circuit, that is, the current operating temperature T1 of the battery circuit is determined according to the specific interval to which the current operating temperature T1 of the battery circuit belongs. As an example, if the T1 temperature belongs to a lower temperature range, it indicates that the vehicle battery temperature at this time is also lower, and indicates that there is a temperature exchange requirement in the vehicle battery circuit, and the battery needs to be rapidly heated, so that the current battery operating condition of the vehicle can meet the operating condition of the normal operation of the vehicle, and if the T2 temperature is higher, it indicates that the vehicle battery temperature at this time is higher, it indicates that there is a temperature exchange requirement in the vehicle battery circuit, and it needs to be rapidly cooled, so that the current battery operating condition of the vehicle can meet the operating condition of the normal operation of the vehicle.
And according to the current working temperature of the battery loop, determining whether the battery loop has a temperature exchange requirement, wherein the step of dividing the temperature interval comprises the following steps:
s202-1, determining the temperature interval of the battery loop to which the current working temperature of the battery loop belongs according to the corresponding relation between the current working temperature of the battery loop and the temperature interval of the battery loop.
In the embodiment, as shown in the proportional valve opening calibration table in table 1, the operating temperature of the battery circuit is divided into a plurality of temperature ranges from low to high in advance, as can be seen from table 1, the lowest operating temperature at which the battery circuit operates is determined to be-5 degrees celsius, and even if the current operating temperature of the motor circuit, which is acquired by the first temperature sensor, is lower than-5 degrees celsius, the current operating temperature of the motor circuit is also determined to be-5 degrees celsius, because under the above 2 operating conditions, the temperature exchange requirements of the battery circuit are the same, and the current operating conditions of the battery of the vehicle can meet the operating conditions of normal operation of the vehicle only if the battery needs to be rapidly heated.
Similarly, the maximum working temperature of the battery loop is determined to be 40 ℃, and even if the current working temperature of the battery loop acquired by the first temperature sensor is higher than 40 ℃, the current working temperature of the battery loop is also determined to be 40 ℃, because under the above 2 working conditions, the temperature exchange requirements of the battery loop are the same, and the battery needs to be rapidly cooled, so that the current battery working condition of the vehicle can meet the working condition of normal operation of the vehicle. I.e. the operating temperature range of the battery circuit is determined to be-5 to 40 degrees celsius.
S202-2, the temperature interval of the battery loop at least comprises the following steps: the temperature range is a low temperature range, an optimal working temperature range and a high temperature range.
In the present embodiment, the temperature range of the battery circuit may be divided into a plurality of temperature ranges in advance according to the type of the vehicle and the external adjustment, but the plurality of temperature ranges at least need to include a low temperature range, an optimum operating temperature range, and a high temperature range, and the greater the number of temperature ranges, the higher the accuracy and the higher the accuracy in determining the opening degree of the proportional valve.
Taking an operating temperature range of a battery loop as an example of-5 ℃ to 40 ℃, a temperature value corresponding to a low temperature range of the battery loop is-5 ℃ to 5 ℃, in the temperature range, it is indicated that the battery is in a low-temperature use state, normal operation of the vehicle can be ensured only by raising the temperature of the battery, a temperature range corresponding to 5 ℃ to 20 ℃ is a first temperature range, in the first temperature range, it is indicated that the temperature of the battery is low and the battery can normally operate, and temperature adjustment can also be performed through a motor loop pair, a temperature range corresponding to 20 ℃ to 25 ℃ is an optimal operating temperature range, in the optimal operating temperature range, the battery is in a normal use state, so that temperature adjustment is not required through the motor loop pair and normal operation can be satisfied, a temperature range corresponding to 26 ℃ to 40 ℃ is a high temperature range, in the high temperature range, it is indicated that the battery is in a high-temperature use state, and therefore temperature adjustment through the motor loop pair is required to reduce the temperature of the battery, and normal operation of the vehicle can be ensured.
According to the corresponding relationship between the current working temperature T1 of the battery circuit acquired by the first temperature sensor and the preset temperature range, as an example, if T1 is located at-5 to 5 degrees celsius, the temperature range of the battery circuit to which the first temperature sensor belongs is determined to be a low temperature range, if T1 is located at 5 to 20 degrees celsius, the temperature range of the battery circuit to which the first temperature sensor belongs is determined to be a first temperature range, if T1 is located at 20 to 25 degrees celsius, the temperature range of the battery circuit to which the first temperature sensor belongs is determined to be an optimal working temperature range, and if T1 is located at 25 to 40 degrees celsius, the temperature range of the battery circuit to which the first temperature sensor belongs is determined to be a high temperature range. According to the specific numerical value of T1, the temperature interval of the battery loop to which the current working temperature of the battery loop belongs can be determined, and the specific state of the battery loop can be reflected.
In one embodiment, the temperature value at the end point of each temperature interval may be determined according to the external environment temperature to adjust the specific temperature interval. As an example, if the current operating temperature T1 of the battery circuit is 5 degrees celsius, if the external environment temperature is 3 degrees celsius, the temperature range corresponding to the current operating temperature T1 of the battery circuit is a first temperature range, if the temperature T1 is 5 degrees celsius, and if the external environment temperature is 20 degrees celsius, the temperature range corresponding to the current operating temperature T1 of the battery circuit is a low temperature range.
S202-3, if the temperature interval to which the battery loop belongs is a high-temperature interval or a low-temperature interval, determining that the temperature exchange requirement exists in the battery loop.
In this embodiment, after the temperature interval to which the battery loop belongs is determined, if the temperature interval is within the low temperature interval, it is indicated that the battery is in a low-temperature use state, and the temperature of the battery needs to be increased to ensure normal operation of the vehicle, and if the temperature interval is within the high temperature interval, it is indicated that the battery is in a high-temperature use state, so that the temperature of the battery needs to be adjusted by the motor loop pair, and the temperature of the battery is lower to ensure normal operation of the vehicle.
S202-4, if the temperature interval to which the battery loop belongs is the optimal working temperature interval, determining that the temperature exchange requirement does not exist in the battery loop.
In this embodiment, after the temperature interval to which the battery circuit belongs is determined, if the temperature interval is within the optimal operating temperature interval, it indicates that the battery is in an optimal operating state at this time, the temperature of the coolant in the battery circuit at this time does not need to be changed, there is no temperature exchange requirement, that is, there is no need to connect the motor circuit to exchange heat, and it may be determined that the target opening of the corresponding proportional valve is zero.
In the embodiments of S202-1 to S202-4, a temperature interval to which the battery loop currently belongs is determined according to a matching relationship between the current operating temperature of the battery loop and a temperature interval divided in advance, that is, the current temperature state of the battery loop is determined, a first-level judgment is performed according to the state of the battery loop to determine whether there is an exchange demand, and after it is determined that there is a temperature exchange demand, calculation of the opening of the proportional valve is performed, so that the calculation amount is reduced, the response time is reduced, and the calculation speed is increased.
And S203, under the condition that the temperature exchange requirement of the battery loop is determined, determining the target opening degree of the proportional valve according to the current working temperature of the battery loop and the current working temperature of the motor loop.
After the temperature exchange requirement of the motor loop is determined, the target opening degree of the proportional valve needs to be determined by combining the current working temperature T1 of the battery loop and the current working temperature T2 of the motor loop, which are acquired by the first sensor, and the specific process can be divided into the following steps:
and searching a preset proportional valve opening calibration table by taking the current working temperature of the battery loop and the current working temperature of the motor loop as indexes, and determining the target opening of the proportional valve by combining an interpolation algorithm.
In this embodiment, as shown in the proportional valve opening calibration table shown in table 1, taking the current operating temperature T1=10 degrees celsius of the battery circuit as an example, if the current operating temperature T2=25 degrees celsius of the motor circuit at this time, it can be known from the table lookup that the target opening of the proportional valve is 85, that is, under the operating conditions of T1=10 degrees celsius and T2=25 degrees celsius, the battery circuit has a temperature increase demand, and the current operating temperature T2 of the motor circuit is higher than the current operating temperature T1 of the battery circuit, so that the temperature compensation can be implemented on the battery circuit through the motor circuit. If the current operating temperature T2=50 degrees celsius at this time, it can be known from a table lookup that the target opening degree of the proportional valve is 0, that is, under the operating conditions of T1=10 degrees celsius and T2=50 degrees celsius, the battery circuit has a temperature increase demand, and the current operating temperature T2 of the motor circuit is much higher than the current operating temperature T1 of the battery circuit, and if the temperature of the battery circuit is compensated by using the motor circuit, the temperature of the battery circuit is increased to a higher value. Therefore, the battery loop temperature is not compensated for by the motor loop. If the current operating temperature T2=22 degrees celsius of the motor circuit at this time is found by looking up a table, and there is no corresponding value, the target opening degree of T2=22 degrees celsius is determined by a linear relationship through the target opening degree values corresponding to T2=20 degrees celsius and T2=25 degrees celsius.
And S204, adjusting the opening degree of the proportional valve to a target opening degree so as to exchange cooling liquid between the motor loop and the battery loop.
In the embodiment, after the target opening degree of the proportional valve is determined, the opening degree of the proportional valve is adjusted to the target opening degree, so that the motor circuit and the battery circuit are connected and conducted according to the target opening degree, the mutual circulation of cooling liquid is realized, and heat exchange is realized, so that the temperatures of the battery circuit and the motor circuit are in a normal range, and the heat management requirements of the battery circuit and the motor circuit are met without additionally consuming the energy of a vehicle.
Through the implementation of S201 to S204, when the temperature of the motor is higher and the temperature of the battery is lower, the vehicle in the running working condition can avoid using a fan to cool the motor and using a PTC to heat the battery; when the temperature of the motor is low and the temperature of the battery is high, the conditions that the battery is cooled by a compressor and the motor is actively heated are avoided through balance, so that the energy consumption of the whole vehicle is reduced, and the winter endurance mileage of the vehicle is improved.
In a possible embodiment, if the temperature interval to which the motor circuit belongs is a low temperature interval or a high temperature interval, it is determined whether the motor circuit has a temperature compensation capability for the tank circuit according to the current working temperature of the motor circuit, and the target opening of the proportional valve is determined to be zero.
In this embodiment, even if it is determined that the temperature exchange requirement of the battery circuit exists, the target opening degree of the proportional valve may be further determined to be zero based on whether the temperature of the motor circuit has the ability to satisfy the temperature exchange requirement of the battery circuit. Thereby reducing the amount of computation, reducing the response time, and speeding up the computation.
The method for determining whether the motor circuit has a temperature compensation capability for the battery circuit according to the current working temperature of the motor circuit, as shown in fig. 3, may specifically include the following steps:
s301, determining a motor loop temperature interval to which the motor loop belongs according to the corresponding relation between the current working temperature of the motor loop and the temperature interval of the motor loop, wherein the temperature interval of the motor loop comprises a low-temperature interval, an optimal working temperature interval and a high-temperature interval from low to high.
In this embodiment, according to the corresponding relationship between the current operating temperature T2 of the motor circuit acquired by the second temperature sensor and the preset temperature range, as an example, if T2 is less than 10 degrees celsius, it is determined that the motor circuit temperature range to which the second temperature sensor belongs is a low temperature range, if T2 is located between 10 degrees celsius and 20 degrees celsius, it is determined that the motor circuit temperature range to which the second temperature sensor belongs is a first temperature range, if T2 is located between 20 degrees celsius and 30 degrees celsius, it is determined that the motor circuit temperature range to which the second temperature sensor belongs is an optimal operating temperature range, and if T2 is located between 30 degrees celsius and 40 degrees celsius, it is determined that the motor circuit temperature range to which the second temperature sensor belongs is a high temperature range. And determining the temperature interval of the motor loop to which the current working temperature of the motor loop belongs according to the specific numerical value of T2. The temperature interval of the motor loop is divided into a plurality of temperature intervals, but the plurality of temperature intervals at least need to comprise a low temperature interval, an optimal working temperature interval and a high temperature interval, and the more the temperature intervals are, the higher the accuracy and the higher the precision can be when the opening degree of the proportional valve is determined. As shown in table 1, the temperature value corresponding to the low temperature range of the motor circuit is less than 10 degrees celsius, the temperature range corresponding to 10 degrees celsius to 20 degrees celsius is the first temperature range, the temperature range corresponding to 20 degrees celsius to 30 degrees celsius is the optimum working temperature range, and the temperature range corresponding to 30 degrees celsius to 40 degrees celsius is the high temperature range.
Table 1: proportional valve opening calibration meter
S302, if the temperature interval to which the battery loop belongs is a low-temperature interval and the temperature interval to which the motor loop belongs is a low-temperature interval, determining that the motor loop does not have the compensation capacity for the battery loop, and determining that the target opening of the proportional valve is zero; /or
And if the temperature interval to which the battery loop belongs is a high-temperature interval and the temperature interval to which the motor loop belongs is a high-temperature interval, determining that the motor loop does not have the compensation capability for the battery loop, and determining that the target opening of the proportional valve is zero.
In the present embodiment, as an example, when the current operating temperature T1=5 degrees celsius of the battery circuit is taken as an example, the temperature section to which the battery circuit belongs may be determined to be a low temperature section, and when the current operating temperature T2=8 degrees celsius of the motor circuit at this time, the temperature section to which the motor circuit belongs may also be a low temperature section. Therefore, the current operating temperature of the motor circuit does not have the ability to compensate for the battery circuit.
In another example, if the current operating temperature T1=35 degrees celsius of the battery circuit is taken as an example, the temperature zone to which the battery circuit belongs may be determined as a high temperature zone, and if the current operating temperature T2=40 degrees celsius of the motor circuit at this time, the temperature zone to which the motor circuit belongs may also be a high temperature zone. Likewise, the current operating temperature of the motor circuit does not have the ability to compensate for the battery circuit.
An embodiment of the present invention further provides a temperature control apparatus for a power system, and referring to fig. 4, a functional block diagram of the temperature control apparatus for a power system according to the present invention is shown, and the apparatus may include the following units:
an obtaining unit 401, configured to obtain a current operating temperature of the motor circuit and a current operating temperature of the battery circuit;
a first determining unit 402, configured to determine whether a temperature exchange requirement exists in the battery circuit according to a temperature interval to which a current operating temperature of the battery circuit belongs;
a second determining unit 403, configured to determine a target opening degree of the proportional valve according to a current operating temperature of the battery circuit and a current operating temperature of the motor circuit when it is determined that a temperature exchange requirement exists in the battery circuit;
and an adjusting unit 404, configured to adjust the opening degree of the proportional valve to a target opening degree, so that the motor circuit and the battery circuit perform coolant exchange.
In one possible implementation, the first determining unit 402 includes:
the temperature interval matching subunit is used for determining the temperature interval of the battery loop to which the current working temperature of the battery loop belongs according to the corresponding relation between the current working temperature of the battery loop and the temperature interval of the battery loop, wherein the temperature interval of the battery loop at least comprises a low temperature interval, an optimal working temperature interval and a high temperature interval from low to high;
the first judging subunit is used for determining the temperature exchange requirement of the battery loop if the temperature interval to which the battery loop belongs is a high-temperature interval or a low-temperature interval;
a second determining subunit, configured to determine that there is no temperature exchange requirement for the battery circuit if the temperature range to which the battery circuit belongs is the optimal operating temperature range
In a possible implementation, the second determining unit 403 includes:
and the calculating subunit is used for searching a preset proportional valve opening calibration table by taking the current working temperature of the battery loop and the current working temperature of the motor loop as indexes, and determining the target opening of the proportional valve by combining an interpolation algorithm.
In a possible embodiment, the apparatus further comprises: a third determination unit for determining that the target opening degree of the proportional valve is zero in a case where it is determined that there is no temperature exchange demand of the battery circuit.
In one possible embodiment, the apparatus further comprises: and the fourth determining unit is used for determining whether the motor loop has the temperature compensation capacity for the battery loop or not according to the current working temperature of the motor loop and determining that the target opening of the proportional valve is zero if the temperature interval to which the battery loop belongs is a low-temperature interval or a high-temperature interval.
In one possible embodiment, the fourth determination unit includes:
the temperature interval dividing subunit is used for dividing the working temperature of the motor loop from low to high into a plurality of temperature intervals in advance;
the temperature interval determining subunit is used for determining the temperature interval of the motor loop to which the motor loop belongs according to the corresponding relation between the current working temperature of the motor loop and the temperature interval of the motor loop;
the first judging subunit is used for determining that the motor loop does not have the compensation capacity for the battery loop if the temperature interval to which the battery loop belongs is a low-temperature interval and the temperature interval to which the motor loop belongs is a low-temperature interval; /or
And the second judging subunit is used for determining that the motor loop does not have the compensation capability for the battery loop if the temperature interval to which the battery loop belongs is a high-temperature interval and the temperature interval to which the motor loop belongs is a high-temperature interval.
The embodiment of the present application further provides a method including: the system comprises a motor loop, a battery loop, a proportional valve and a controller;
the proportional valve is used for connecting the motor loop and the battery loop;
the controller is used for controlling the proportional valve, and the proportional valve is used for connecting the motor loop and the battery loop;
the controller is configured to perform the method steps of the first aspect of the embodiments of the present application.
Embodiments of the present application also provide a computer-readable storage medium having stored thereon instructions that, when executed by a controller, cause the controller to perform the method steps of the first aspect of embodiments of the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable vehicles (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create a system for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction system which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. "and/or" means that either or both of them can be selected. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising one of \ 8230; \8230;" does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
The present invention provides a method, an apparatus, a vehicle and a storage medium for controlling temperature of a power system, which are described in detail above, and the present invention is described in detail by applying specific examples to explain the principle and the implementation of the present invention, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for controlling temperature of a power system, applied to a controller for controlling a proportional valve for connecting a motor circuit and a battery circuit, the method comprising:
acquiring the current working temperature of the motor loop and the current working temperature of the battery loop;
determining whether a temperature exchange requirement exists in the battery loop according to a temperature interval to which the current working temperature of the battery loop belongs;
under the condition that the temperature exchange requirement of the battery loop is determined, determining the target opening degree of the proportional valve according to the current working temperature of the battery loop and the current working temperature of the motor loop;
and adjusting the opening degree of the proportional valve to the target opening degree so as to exchange cooling liquid between the motor loop and the battery loop.
2. The method of claim 1, wherein determining whether a temperature exchange requirement exists for the battery circuit based on a temperature interval to which a current operating temperature of the battery circuit belongs comprises:
determining a temperature interval of the battery loop according to the corresponding relation between the current working temperature of the battery loop and the temperature interval of the battery loop, wherein the temperature interval of the battery loop at least comprises a low temperature interval, an optimal working temperature interval and a high temperature interval from low to high;
if the temperature interval to which the battery loop belongs is a high-temperature interval or a low-temperature interval, determining that the temperature exchange requirement exists in the battery loop;
and if the temperature interval to which the battery loop belongs is the optimal working temperature interval, determining that the temperature exchange requirement does not exist in the battery loop.
3. The method of claim 1, wherein determining the target opening of the proportional valve based on the current operating temperature of the battery circuit and the current operating temperature of the motor circuit comprises:
and searching a preset proportional valve opening calibration table by taking the current working temperature of the battery loop and the current working temperature of the motor loop as indexes, and determining the target opening of the proportional valve by combining an interpolation algorithm.
4. The method of claim 1, further comprising:
determining that the target opening of the proportional valve is zero upon determining that there is no temperature exchange demand of the battery circuit.
5. The method of claim 3, wherein prior to determining the target opening of the proportional valve based on the current operating temperature of the battery circuit and the current operating temperature of the motor circuit, the method further comprises:
and if the temperature interval to which the battery loop belongs is a low-temperature interval or a high-temperature interval, determining whether the motor loop has the temperature compensation capacity for the tank loop or not according to the current working temperature of the motor loop, and determining that the target opening of the proportional valve is zero.
6. The method of claim 3, wherein determining whether the motor circuit has temperature compensation capability for the pool circuit based on the current operating temperature of the motor circuit comprises:
determining a motor loop temperature interval to which the motor loop belongs according to the corresponding relation between the current working temperature of the motor loop and the temperature interval of the motor loop, wherein the temperature interval of the motor loop comprises a low temperature interval, an optimal working temperature interval and a high temperature interval from low to high;
if the temperature interval to which the battery loop belongs is a low-temperature interval and the temperature interval to which the motor loop belongs is a low-temperature interval, determining that the motor loop does not have the compensation capacity for the battery loop; and/or
And if the temperature interval to which the battery loop belongs is a high-temperature interval and the temperature interval to which the motor loop belongs is a high-temperature interval, determining that the motor loop does not have the compensation capacity for the battery loop.
7. A temperature control apparatus for a powertrain system, the apparatus comprising:
the acquisition unit is used for acquiring the current working temperature of the motor loop and the current working temperature of the battery loop;
the first determining unit is used for determining whether the temperature exchange requirement exists in the battery loop according to the temperature interval to which the current working temperature of the battery loop belongs;
the second determining unit is used for determining the target opening degree of the proportional valve according to the current working temperature of the battery loop and the current working temperature of the motor loop under the condition that the temperature exchange requirement of the battery loop is determined;
and the adjusting unit is used for adjusting the opening of the proportional valve to the target opening so as to exchange cooling liquid between the motor loop and the battery loop.
8. The apparatus according to claim 7, wherein the second determining unit comprises:
and the calculating subunit is used for searching a preset proportional valve opening calibration table by taking the current working temperature of the battery loop and the current working temperature of the motor loop as indexes, and determining the target opening of the proportional valve by combining an interpolation algorithm.
9. A vehicle, characterized by comprising: the system comprises a motor loop, a battery loop, a proportional valve and a controller;
the proportional valve is used for connecting the motor loop and the battery loop;
the controller is used for controlling a proportional valve, and the proportional valve is used for connecting a motor loop and a battery loop;
the controller is configured to perform the steps of the method for temperature control of a power system according to any one of claims 1-6.
10. A computer readable storage medium having stored thereon instructions, which when executed by a controller, cause the controller to perform the steps of the method of temperature control of a power system according to any of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210395961.1A CN115230535A (en) | 2022-04-15 | 2022-04-15 | Temperature control method and device for power system, vehicle and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210395961.1A CN115230535A (en) | 2022-04-15 | 2022-04-15 | Temperature control method and device for power system, vehicle and storage medium |
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| CN115230535A true CN115230535A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210395961.1A Pending CN115230535A (en) | 2022-04-15 | 2022-04-15 | Temperature control method and device for power system, vehicle and storage medium |
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| Country | Link |
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| CN (1) | CN115230535A (en) |
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- 2022-04-15 CN CN202210395961.1A patent/CN115230535A/en active Pending
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