CN116330921A - Thermal management method for dual heat source system of vehicle, electronic device, and storage medium - Google Patents
Thermal management method for dual heat source system of vehicle, electronic device, and storage medium Download PDFInfo
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- 230000008859 change Effects 0.000 claims abstract description 6
- 230000004044 response Effects 0.000 claims abstract description 5
- 239000000110 cooling liquid Substances 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 description 19
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- 238000004364 calculation method Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
- B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2228—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters
- B60H2001/224—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters automatic operation, e.g. control circuits or methods
Abstract
The invention discloses a thermal management method of a vehicle dual-heat-source system, an electronic device and a storage medium. The method comprises the following steps: acquiring a target temperature of a thermal management system of the vehicle dual-heat-source system in response to a change event of the target temperature of the thermal management system; setting the target temperature of the electric heater to be lower than the target temperature of the thermal management system, and setting the target temperature of the heat pump compressor to be the target temperature of the thermal management system; the electric heater is controlled to work by adopting the target temperature of the electric heater, and the heat pump compressor is controlled to work by adopting the target temperature of the heat pump compressor; and monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold. According to the invention, the target temperature of the electric heater is reduced, a power upper sounding space is reserved for the compressor, and the electric heater is forcibly turned off when the use power of the electric heater is reduced, so that the duty ratio of the compressor as a heat source is increased, and the overall energy consumption ratio of the system is improved.
Description
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method for thermal management of a dual heat source system of a vehicle, an electronic device, and a storage medium.
Background
Some existing vehicles use electric heaters and heat pump compressors as dual heat source systems. The electric heater is preferably a water heating heater (Water Positive Temperature Coefficient, WPTC). In the heating mode for the passenger compartment, an electric heater and a heat pump compressor are required to provide energy as dual heat sources. The electric heater has fast temperature rise and low energy efficiency; the heat pump compressor heats up slowly, but the energy efficiency is high.
As the heat pump compressor has a higher energy consumption ratio (Coefficient Of Performance, COP). The prior art therefore desires a heat pump compressor having a higher heat source duty cycle. The prior art thermal management method is to keep the same target temperature of the electric heater and the heat pump compressor, hopefully, the electric heater is used for rapidly raising the temperature and then gradually withdrawing, and meanwhile, the power of the heat pump compressor is slowly increased and kept at the target temperature.
However, the control of the existing electric heater is to take different powers for control according to the target and actual temperature difference. For example:
electric heater request power calculation:
(target temperature-actual temperature) >3 ℃, request power=7000W;
(target temperature-actual temperature) =3deg.C, request power=4000W;
(target temperature-actual temperature) =2deg.C, request power=4000W;
(target temperature-actual temperature) =1deg.C, request power=3200w;
(target temperature-actual temperature) =0deg.C, request power=2500W;
(target temperature-actual temperature) = -1 ℃, request power=2000W;
(target temperature-actual temperature) = -2 ℃, request power=1600W;
(target temperature-actual temperature) = -3 ℃, request power = 1000W;
(target temperature-actual temperature). Ltoreq.4 ℃, request power=0w.
However, in a dual heat source system including an electric heater and a heat pump, the electric heater is not a single heat pipe, and the heat pump compressor can also provide a portion of the heat source. And the heating power of the electric heater is fast to rise and is faster than that of the heat pump compressor. Under the condition of double heat sources, the electric heater and the heat pump compressor simultaneously provide heat power, but the electric heater is faster, so when the rotating speed of the heat pump compressor is not high, namely only smaller heat power can be provided, the temperature of the system reaches the target or the heat balance, the current heating condition of the electric heater and the heat pump compressor can be kept, and the electric heater cannot exit. Therefore, the existing electric heater control strategy cannot continuously increase the power of the heat pump compressor, and it is more difficult to enable the electric heater to withdraw the energy completely from the heat pump compressor.
Disclosure of Invention
Accordingly, it is necessary to provide a thermal management method, an electronic device, and a storage medium for a dual-heat-source system of a vehicle, which solve the technical problem that the electric heater is difficult to withdraw from the heat supply in the dual-heat-source system of the vehicle in the prior art.
The invention provides a thermal management method of a vehicle double-heat-source system, wherein the double-heat-source system adopts an electric heater and a heat pump compressor as heat sources, and the method comprises the following steps:
acquiring a target temperature of a thermal management system of the vehicle dual-heat-source system in response to a change event of the target temperature of the thermal management system;
setting the target temperature of the electric heater to be lower than the target temperature of the thermal management system, and setting the target temperature of the heat pump compressor to be the target temperature of the thermal management system;
controlling the electric heater to work by adopting the target temperature of the electric heater, and simultaneously controlling the heat pump compressor to work by adopting the target temperature of the heat pump compressor;
and monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold.
Further, the setting the electric heater target temperature of the electric heater to be lower than the thermal management system target temperature specifically includes:
setting the target temperature of the electric heater as the target temperature of the thermal management system minus a preset first temperature value.
Still further, before the setting the electric heater target temperature of the electric heater to the thermal management system target temperature minus a preset first temperature value, the method further includes:
acquiring the current environment temperature and determining a first temperature value corresponding to the current environment temperature.
Further, the monitoring the actual power of the electric heater, when the actual power is smaller than a preset power threshold, turning off the electric heater specifically includes:
acquiring a current environment temperature and determining a first time corresponding to the current environment temperature;
and monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold and exceeds a first time.
Further, after the turning off the electric heater, the method further includes:
and monitoring the actual temperature of the electric heater, and restarting the electric heater when the actual temperature is less than or equal to the target temperature of the electric heater minus a second temperature value.
Still further, the re-turning on the electric heater specifically includes:
reducing the first temperature value by a preset correction value to obtain an updated first temperature value;
updating the target temperature of the electric heater to be the target temperature of the thermal management system minus the updated first temperature value;
and controlling the electric heater to work by adopting the updated target temperature of the electric heater.
Further, the controlling the electric heater to work by adopting the target temperature of the electric heater specifically includes:
calculating electric heater request power according to the electric heater target temperature;
and adopting the electric heater request power to control the electric heater to work.
Further, the calculating the electric heater request power according to the electric heater target temperature specifically includes:
the electric heater request power is calculated as follows: q=k×m×c×Δt, where Q is the electric heater request power, k is a heat loss coefficient, m is a liquid mass flow rate, c is a specific heat capacity of the cooling liquid, and Δt is a temperature difference between the electric heater target temperature and the electric heater actual temperature.
The present invention provides an electronic device including:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to at least one of the processors; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores instructions executable by at least one of the processors to enable the at least one processor to perform a method of thermal management of a dual heat source system of a vehicle as previously described.
The present invention provides a storage medium storing computer instructions that, when executed by a computer, perform all the steps of a method of thermal management of a dual heat source system of a vehicle as described above.
According to the invention, the target temperature of the electric heater is reduced, a power upper sounding space is reserved for the compressor, and the electric heater is forcibly turned off when the use power of the electric heater is reduced, so that the duty ratio of the compressor as a heat source is increased, and the overall energy consumption ratio of the system is improved.
Drawings
FIG. 1 is a flowchart illustrating a method of thermal management of a dual heat source system of a vehicle according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method of thermal management of a dual heat source system of a vehicle according to another embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating power variation of an electric heater and a heat pump compressor according to an embodiment of the present invention;
FIG. 4 is a flowchart showing a method for controlling a water heater in a dual heat source system of a vehicle according to a preferred embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware structure of an electronic device according to the present invention.
Detailed Description
Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
FIG. 1 is a flowchart of a method for thermal management of a dual heat source system of a vehicle using an electric heater and a heat pump compressor as heat sources, according to an embodiment of the invention, the method comprising:
step S101, responding to a change event of a target temperature of a thermal management system of the vehicle dual-heat-source system, and acquiring the target temperature of the thermal management system;
step S102, setting the target temperature of the electric heater to be lower than the target temperature of the thermal management system, and setting the target temperature of the heat pump compressor to be the target temperature of the thermal management system;
step S103, controlling the electric heater to work by adopting the target temperature of the electric heater, and simultaneously controlling the heat pump compressor to work by adopting the target temperature of the heat pump compressor;
step S104, monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold.
In particular, the invention may be applied to an electronic controller unit (Electronic Control Unit, ECU) of a vehicle. Such as an electronic controller unit of a thermal management system.
When the target temperature of the thermal management system changes, triggering and executing step S101, and responding to the event that the target temperature of the thermal management system of the vehicle dual-heat source system changes, acquiring the target temperature of the thermal management system.
Then, step S102 is performed to set the target temperature of the electric heater to be lower than the target temperature of the thermal management system, and set the target temperature of the heat pump compressor to be the target temperature of the thermal management system.
Wherein the electric heater target temperature is lower than the thermal management system target temperature and the heat pump compressor target temperature is consistent with the thermal management system target temperature such that the electric heater target temperature is lower than the heat pump compressor target temperature.
In some embodiments, the electric heater is a water heater (Water Positive Temperature Coefficient, WPTC). The water heating heater heats the cooling liquid by utilizing the heat of the heater (Positive Temperature Coefficient, PTC), the cooling liquid flows through the warm air heating core in the cab, and the air in the cab is circulated under the action of the blower and flows through the heating core to be heated.
The other electric heater is an air heating heater. The air heating heater is directly arranged at the warm air core of the cab, circulates the air in the vehicle through the blower and passes through the heater, and can directly heat the air in the cab, so that the structure is relatively simple, but the electric energy is consumed compared with the water heating heater.
Then, step S103 is performed to control the operation of the electric heater using the electric heater target temperature and to control the operation of the heat pump compressor using the heat pump compressor target temperature at the same time.
In some embodiments, an electric heater request power is determined according to the electric heater target temperature, a heat pump compressor request power is determined according to the heat pump compressor target temperature, the electric heater is controlled to work by using the electric heater request power, and the heat pump compressor is controlled to work by using the heat pump compressor request power.
Specifically, the electric heater target temperature is used as the target temperature of the electric heater, and the electric heater request power is obtained through the existing electric heater request power determining mode. For example, the corresponding requested power is determined according to a temperature difference between the target temperature and the actual temperature of the electric heater.
Similarly, the heat pump compressor target temperature is used as the target temperature of the heat pump compressor, and the heat pump compressor request power is obtained by the existing heat pump compressor request power determining mode. For example, the corresponding requested power is determined based on a temperature difference between a target temperature and an actual temperature of the heat pump compressor.
Finally, step S104 is performed to monitor the actual power of the electric heater. The actual power of the electric heater is changed according to the actual temperature of the electric heater and the target temperature of the electric heater, and when the actual temperature of the electric heater is close to the target temperature of the electric heater, the actual power of the electric heater is smaller than a preset power threshold value, and the electric heater is turned off at the moment.
As shown in fig. 3, an electric heater power curve 31, which is preferably a water heater, and a heat pump compressor power curve 32 are included. Because the target temperature of the electric heater is lower than the target temperature of the heat pump compressor, when the electric heater approaches the target temperature and the actual power of the electric heater is smaller than the preset power threshold, the electric heater is closed and exits, and at the moment, the heat pump compressor still does not reach the target temperature of the heat pump compressor, and enough space is reserved for the heat pump compressor to continuously preempt the heat source. Therefore, the heat pump compressor can independently provide a heat source, and the energy consumption ratio of the heat pump compressor is larger than that of the electric heater, so that the aim of improving the overall energy consumption ratio of the system is fulfilled.
In this embodiment, when the electric heater has heated to the target temperature of the electric heater less than the target temperature of the system, the heating power is stopped from being increased, and because the target temperature of the heat pump compressor is higher, the heat pump compressor is also increasing the power to increase the system temperature of the whole dual-heat-source system, at this time, because the system temperature is higher, the electric heater needs to be reduced according to the table lookup, and in order to compensate for the reduced power of the electric heater, the heat pump compressor continues to increase the power, and the electric heater will exit from heating the system in the same time.
According to the invention, the target temperature of the electric heater is reduced, a power upper sounding space is reserved for the compressor, and the electric heater is forcibly turned off when the use power of the electric heater is reduced, so that the duty ratio of the compressor as a heat source is increased, and the overall energy consumption ratio of the system is improved.
FIG. 2 is a flow chart of a method of thermal management of a dual heat source system of a vehicle using an electric heater and a heat pump compressor as heat sources, comprising:
step S201, in response to a change event of a target temperature of a thermal management system of the dual-heat source system of the vehicle, acquiring the target temperature of the thermal management system.
Step S202, setting the target temperature of the electric heater as the target temperature of the thermal management system minus a preset first temperature value, and setting the target temperature of the heat pump compressor as the target temperature of the thermal management system.
In one embodiment, before the setting the electric heater target temperature of the electric heater to the thermal management system target temperature minus a preset first temperature value, the method further includes:
acquiring the current environment temperature and determining a first temperature value corresponding to the current environment temperature.
And step 203, controlling the electric heater to work by adopting the target temperature of the electric heater, and simultaneously controlling the heat pump compressor to work by adopting the target temperature of the heat pump compressor.
In one embodiment, electric heater request power is calculated from the electric heater target temperature;
and adopting the electric heater request power to control the electric heater to work.
In one embodiment, the calculating the electric heater request power according to the electric heater target temperature specifically includes:
the electric heater request power is calculated as follows: q=k×m×c×Δt, where Q is the electric heater request power, k is a heat loss coefficient, m is a liquid mass flow rate, c is a specific heat capacity of the cooling liquid, and Δt is a temperature difference between the electric heater target temperature and the electric heater actual temperature.
Step S204, monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold.
In one embodiment, the monitoring the actual power of the electric heater, when the actual power is smaller than a preset power threshold, turning off the electric heater specifically includes:
acquiring a current environment temperature and determining a first time corresponding to the current environment temperature;
and monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold and exceeds a first time.
Step S205, monitoring an actual temperature of the electric heater, and restarting the electric heater when the actual temperature is less than or equal to the target temperature of the electric heater minus a second temperature value.
In one embodiment, the restarting the electric heater specifically includes:
reducing the first temperature value by a preset correction value to obtain an updated first temperature value;
updating the target temperature of the electric heater to be the target temperature of the thermal management system minus the updated first temperature value;
and controlling the electric heater to work by adopting the updated target temperature of the electric heater.
Specifically, when the target temperature of the thermal management system changes, step S201 is triggered to be executed, and the target temperature of the thermal management system is acquired in response to a change event of the target temperature of the thermal management system of the dual heat source system of the vehicle.
Preferably, the electric heater is a water heating heater.
Then, step S202 is executed to set the target temperature of the electric heater as the target temperature of the thermal management system minus a preset first temperature value Δt1, and set the target temperature of the heat pump compressor as the target temperature of the thermal management system.
Specifically, the first temperature value Δt1 may be a fixed value, calibrated through a preliminary experiment.
The first temperature value Δt1 may also be set based on the thermal management system target temperature.
In one embodiment, before the setting the electric heater target temperature of the electric heater to the thermal management system target temperature minus a preset first temperature value, the method further includes:
acquiring the current environment temperature and determining a first temperature value corresponding to the current environment temperature.
Since the lower the ambient temperature, the more difficult the heat pump compressor heats up to the specified temperature, the first temperature value Δt1 should be small due to customer comfort, i.e. in view of quickly reaching the temperature required by the customer. For this purpose, the first temperature value is set as a function of the ambient temperature.
Specifically, the optimal value of the first temperature value can be determined by pre-calibration, so that the heat pump compressor can preempt the heat source under different environmental temperatures. And a corresponding table is made for the ambient temperature and the first temperature value. After the ambient temperature is obtained, a corresponding first temperature value is determined by looking up a table.
According to the embodiment, the corresponding first temperature value is determined through the environment temperature, so that the proper target temperature of the electric heater can be set for different environment temperatures.
Then, step S203 is performed to control the electric heater to operate using the electric heater target temperature and to control the heat pump compressor to operate using the heat pump compressor target temperature.
Specifically, determining electric heater request power according to the electric heater target temperature, determining heat pump compressor request power according to the heat pump compressor target temperature, controlling the electric heater to work by adopting the electric heater request power, and controlling the heat pump compressor to work by adopting the heat pump compressor request power.
In one embodiment, electric heater request power is calculated from the electric heater target temperature;
and adopting the electric heater request power to control the electric heater to work.
In one embodiment, the calculating the electric heater request power according to the electric heater target temperature specifically includes:
the electric heater request power is calculated as follows: q=k×m×c×Δt, where Q is the electric heater request power, k is a heat loss coefficient, m is a liquid mass flow rate, c is a specific heat capacity of the cooling liquid, and Δt is a temperature difference between the electric heater target temperature and the electric heater actual temperature.
And after the electric heater is controlled to work by adopting the target temperature of the electric heater and the heat pump compressor is controlled to work by adopting the target temperature of the heat pump compressor, executing step S204, monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold.
Specifically, when the actual power of the electric heater, namely the current power of the electric heater is less than or equal to P1, the electric heater is forcibly turned off. Wherein P1 is a preset power threshold, and the unit is W (W), and can be obtained through calibration.
Specifically, by calibrating the dual heat source modes at different ambient temperatures, different P1 s are adjusted, and the maximum power that can cause the heat pump compressor power to rise to maintain the system condition is selected. Say, the heat pump compressor can reach the target temperature of the system within the adjustment range of P1=200W, 60 s; while p1=300w, 60s in-heat pump compressor cannot reach the system target temperature, and the electric heater needs to be repeatedly turned on to maintain the system temperature, 200W is selected as P1.
In some embodiments, the electric heater is turned off when the actual power is less than a preset power threshold and exceeds a first time.
I.e. the current power of the electric heater is less than or equal to P1 (W) and the duration time T1, the electric heater is forcedly turned off.
Wherein T1 is the first time, the unit is seconds (S), and the time can be obtained through calibration.
By calibrating the dual heat source modes under different ambient temperatures, different T1 s are adjusted by using the calibrated P1 s, and the minimum time for enabling the power of the heat pump compressor to rise to maintain the system condition is selected. Say, adjusting t1=30s, the heat pump compressor can reach the target temperature of the system; while t1=20s, the heat pump compressor cannot reach the target system temperature, and the electric heating is required to be repeatedly turned on to maintain the system temperature, 30s is selected as T1.
In one embodiment, the monitoring the actual power of the electric heater, when the actual power is smaller than a preset power threshold, turning off the electric heater specifically includes:
acquiring a current environment temperature and determining a first time corresponding to the current environment temperature;
and monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold and exceeds a first time.
Specifically, the lower the ambient temperature, the more difficult it is for the heat pump compressor to heat to a given temperature, and in order to provide the heat pump compressor with a power ramp time, the first time T1 should be larger, and therefore, the different first times are set according to the different ambient temperatures so as to provide the heat pump compressor with a suitable power ramp time.
The first time of the present embodiment is determined based on the current ambient temperature. And (5) carrying out calibration experiments in advance, and determining the first time corresponding to different environment temperatures. A table can be made relating ambient temperature to a first time. And then, when the temperature sensor is actually used, after the current ambient temperature is obtained, determining the corresponding first time through table lookup.
And then monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold value and exceeds a first time.
The first time of the embodiment corresponds to the ambient temperature, and through the dual-heat-source calibration experiment under different ambient temperatures, based on the aforementioned strategy, the power of the heat pump compressor can be raised and stabilized on the target temperature of the thermal management system under different ambient temperatures, so as to ensure that the heat pump compressor has the capability of maintaining the target temperature of the system.
Step S205 is then performed, after the electric heater is turned off:
and monitoring the actual temperature of the electric heater, and restarting the electric heater when the actual temperature is less than or equal to the target temperature of the electric heater minus a second temperature value.
Specifically, since the system temperature changes slower than the actual temperature of the electric heater, and the electric heater controls the power by the difference between the target and the actual temperature, the actual temperature of the electric heater is detected. When the actual temperature of the electric heater is less than or equal to the target temperature of the electric heater minus the second temperature value delta t2, the heat source provided by the heat pump compressor is insufficient, so that the electric heater is turned on again to meet the target temperature of the system. Wherein the second temperature value is preset. The temperature dither setting may be acceptable depending on the system.
According to the embodiment, the target temperature of the electric heater is set to be the target temperature of the thermal management system minus the first temperature value, and the target temperature of the heat pump compressor is reserved to be the target temperature of the thermal management system, so that the target temperature of the electric heater is lower than the target temperature of the heat pump compressor, and meanwhile, when the actual power of the electric heater is reduced, the electric heater is turned off, so that the heat pump compressor can smoothly preempt a heat source, the duty ratio of the heat pump compressor serving as the heat source is increased, and the energy consumption ratio of the system is improved. Meanwhile, the electric heater is turned on again to ensure that the target temperature of the system is met.
In some embodiments, after the turning off the electric heater, the method further comprises:
and monitoring the actual temperature of the electric heater, and restarting the electric heater when the actual temperature is less than or equal to the target temperature of the electric heater minus a second temperature value for a second time.
The second time is preset, and can be set according to the acceptable temperature jitter of the system.
In one embodiment, the restarting the electric heater specifically includes:
reducing the first temperature value by a preset correction value to obtain an updated first temperature value;
updating the target temperature of the electric heater to be the target temperature of the thermal management system minus the updated first temperature value;
and controlling the electric heater to work by adopting the updated target temperature of the electric heater.
Specifically, when the electric heater is restarted, the heat source provided by the heat pump compressor is insufficient, so that the target temperature of the electric heater is improved by reducing the first temperature value, the electric heater adopts a higher target temperature of the electric heater, and the temperature jitter caused by insufficient heat supply of the heat pump compressor is avoided.
The present embodiment prevents temperature jitter by reducing the first temperature value when the electric heater is turned back on.
In some embodiments, the setting the electric heater target temperature of the electric heater to be the thermal management system target temperature minus a preset first temperature value specifically includes:
acquiring the current ambient temperature;
if the first temperature value under the current environment temperature is updated in the current driving cycle, acquiring an updated first temperature value corresponding to the current environment temperature, otherwise, acquiring a first temperature value corresponding to the current environment temperature by default;
setting an electric heater target temperature of the electric heater to be the thermal management system target temperature minus the first temperature value.
Specifically, the first temperature value corresponding to the current environmental temperature defaults to be the first temperature value corresponding to the current environmental temperature obtained through experimental calibration, and after the updated first temperature value corresponding to the current environmental temperature is turned on the electric heater again, the first temperature value is reduced by a preset correction value to obtain the updated first temperature value.
Since the default first temperature value of the system is the calibrated initial value, approaching the upper capacity limit of the heat pump compressor has been considered. In order to ensure that the heat pump compressor can provide a heat source stably and rapidly, a process of increasing the first temperature value is not performed. And the first temperature value is not reset within the same driving cycle, but is reset only in case of restart after the end of the driving cycle, for example after a flameout.
Referring to fig. 4, which is a flowchart illustrating a method for controlling a water heater in a dual heat source system of a vehicle according to a preferred embodiment of the present invention, the dual heat source system includes a water heater and a heat pump compressor as heat sources, the heat pump compressor is implemented in a conventional manner, and the method for controlling a water heater includes:
step S401 sets a target temperature of the water heater=a target temperature of the thermal management system- Δt1 (°c).
Step S402, calculating the request power of the water heating heater through a formula;
the formula is: q=k×m×c×Δt, where Q is the electric heater request power, k is a heat loss coefficient, m is a liquid mass flow rate, c is a specific heat capacity of the cooling liquid, and Δt is a temperature difference between the electric heater target temperature and the electric heater actual temperature.
Step S403, if the current power of the water heating heater is less than or equal to P1 (W), executing step S404, otherwise, clearing duration T1, letting t1=0, executing step S408;
step S404, the timing duration T1 is increased by one, if T1 is more than a certain value, step S405 is executed, otherwise step S408 is executed;
step S405, turning off the water heating heater;
step S406, monitoring the actual temperature of the water heating heater, if the actual temperature of the water heating heater is less than or equal to the target temperature delta t2 (DEG C), executing step S407, otherwise, continuing to execute step S405;
step S407, adding one to the timing duration T2, if T2 is more than a certain value, executing step S408, otherwise executing step S405;
step S408, the water heating heater operates normally.
Fig. 5 is a schematic diagram of a hardware structure of an electronic device according to the present invention, including:
at least one processor 501; the method comprises the steps of,
a memory 502 communicatively coupled to at least one of the processors 501; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory 502 stores instructions executable by at least one of the processors to enable the at least one processor to perform a method of thermal management of a dual heat source system of a vehicle as previously described.
One processor 501 is illustrated in fig. 5.
The electronic device may further include: an input device 503 and a display device 504.
The processor 501, memory 502, input device 503, and display device 504 may be connected by a bus or other means, the connection being illustrated by a bus.
The memory 502 is used as a non-volatile computer readable storage medium for storing non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions/modules corresponding to the thermal management method of the dual-heat source system of the vehicle in the embodiments of the present application, for example, the method flows shown in fig. 1 and 2. The processor 501 executes various functional applications and data processing by running nonvolatile software programs, instructions, and modules stored in the memory 502, that is, implements the thermal management method of the vehicle dual heat source system in the above-described embodiment.
Memory 502 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of a thermal management method of the dual heat source system of the vehicle, or the like. In addition, memory 502 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 502 may optionally include memory remotely located with respect to processor 501, which may be connected via a network to a device performing the thermal management method of the dual heat source system of the vehicle. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 503 may receive user clicks of inputs and generate signal inputs related to user settings and function control of the thermal management method of the dual heat source system of the vehicle. The display 504 may include a display device such as a display screen.
The thermal management method of the vehicle dual heat source system in any of the method embodiments described above is performed when the one or more modules are stored in the memory 502 and executed by the one or more processors 501.
According to the invention, the target temperature of the electric heater is reduced, a power upper sounding space is reserved for the compressor, and the electric heater is forcibly turned off when the use power of the electric heater is reduced, so that the duty ratio of the compressor as a heat source is increased, and the overall energy consumption ratio of the system is improved.
An embodiment of the invention provides a storage medium storing computer instructions that, when executed by a computer, perform all the steps of a method of thermal management of a dual heat source system of a vehicle as previously described.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method of thermal management of a dual heat source system of a vehicle employing an electric heater and a heat pump compressor as heat sources, the method comprising:
acquiring a target temperature of a thermal management system of the vehicle dual-heat-source system in response to a change event of the target temperature of the thermal management system;
setting the target temperature of the electric heater to be lower than the target temperature of the thermal management system, and setting the target temperature of the heat pump compressor to be the target temperature of the thermal management system;
controlling the electric heater to work by adopting the target temperature of the electric heater, and simultaneously controlling the heat pump compressor to work by adopting the target temperature of the heat pump compressor;
and monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold.
2. The method for thermal management of a dual heat source system of a vehicle according to claim 1, wherein said setting an electric heater target temperature of said electric heater to be lower than said thermal management system target temperature specifically comprises:
setting the target temperature of the electric heater as the target temperature of the thermal management system minus a preset first temperature value.
3. The method of thermal management of a dual heat source system of a vehicle of claim 2, wherein the setting the electric heater target temperature of the electric heater is prior to the thermal management system target temperature minus a preset first temperature value, the method further comprising:
acquiring the current environment temperature and determining a first temperature value corresponding to the current environment temperature.
4. The method of claim 1, wherein the monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is less than a preset power threshold, specifically comprises:
acquiring a current environment temperature and determining a first time corresponding to the current environment temperature;
and monitoring the actual power of the electric heater, and turning off the electric heater when the actual power is smaller than a preset power threshold and exceeds a first time.
5. The method of thermal management of a dual heat source system of a vehicle of claim 1, wherein after said turning off said electric heater, said method further comprises:
and monitoring the actual temperature of the electric heater, and restarting the electric heater when the actual temperature is less than or equal to the target temperature of the electric heater minus a second temperature value.
6. The method of thermal management of a dual heat source system of a vehicle of claim 5, wherein said restarting said electric heater specifically comprises:
reducing the first temperature value by a preset correction value to obtain an updated first temperature value;
updating the target temperature of the electric heater to be the target temperature of the thermal management system minus the updated first temperature value;
and controlling the electric heater to work by adopting the updated target temperature of the electric heater.
7. The method of thermal management of a dual heat source system of a vehicle of claim 1, wherein said employing said electric heater target temperature to control operation of said electric heater comprises:
calculating electric heater request power according to the electric heater target temperature;
and adopting the electric heater request power to control the electric heater to work.
8. The method of thermal management of a dual heat source system of a vehicle of claim 7, wherein said calculating an electric heater request power from said electric heater target temperature comprises:
the electric heater request power is calculated as follows: q=k×m×c×Δt, where Q is the electric heater request power, k is a heat loss coefficient, m is a liquid mass flow rate, c is a specific heat capacity of the cooling liquid, and Δt is a temperature difference between the electric heater target temperature and the electric heater actual temperature.
9. An electronic device, comprising:
at least one processor; the method comprises the steps of,
in a memory communicatively coupled to at least one of the processors,
the memory stores instructions executable by at least one of the processors to enable the at least one of the processors to perform the method of thermal management of a dual heat source system of a vehicle as claimed in any one of claims 1 to 8.
10. A storage medium storing computer instructions which, when executed by a computer, are adapted to carry out all the steps of a method of thermal management of a dual heat source system of a vehicle as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310181007.7A CN116330921A (en) | 2023-02-27 | 2023-02-27 | Thermal management method for dual heat source system of vehicle, electronic device, and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310181007.7A CN116330921A (en) | 2023-02-27 | 2023-02-27 | Thermal management method for dual heat source system of vehicle, electronic device, and storage medium |
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| CN202310181007.7A Pending CN116330921A (en) | 2023-02-27 | 2023-02-27 | Thermal management method for dual heat source system of vehicle, electronic device, and storage medium |
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| CN (1) | CN116330921A (en) |
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