CN114953919A

CN114953919A - Vehicle motor waste heat management system, method and device, storage medium and vehicle

Info

Publication number: CN114953919A
Application number: CN202210760366.3A
Authority: CN
Inventors: 蔡小刚; 徐洪星; 胡康
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-08-30

Abstract

The invention provides a vehicle motor waste heat management system, a method, a device, a storage medium and a vehicle, wherein the management system comprises: the system comprises a cooling loop, a battery cell unit and a heat pump air conditioning system; the electric core units are conducted and controllably connected in parallel on the cooling loop; the management system has a first mode for heating the cell unit due to conduction of the cell unit and the cooling circuit, a second mode for conducting the cooling circuit and the refrigerator, a third mode for blocking the cooling circuit and the refrigerator and absorbing heat in outside air by the first circuit, and a fourth mode for simultaneously blocking the cooling circuit, the refrigerator and the cell unit. The vehicle motor waste heat management system has four executable modes, so that different state requirements of the vehicle motor in waste heat utilization can be met, functional conflict and interference are avoided, and the overall vehicle heat management efficiency is effectively improved.

Description

Vehicle motor waste heat management system, method and device, storage medium and vehicle

Technical Field

The invention relates to the technical field of vehicle motor heat management, in particular to a vehicle motor waste heat management system; meanwhile, the invention also relates to a vehicle motor waste heat management method based on the vehicle motor waste heat management system, a vehicle motor waste heat control device, a computer readable storage medium and a vehicle provided with the vehicle motor waste heat management system.

Background

The pure electric vehicle market develops at a high speed, and the endurance mileage is increased slowly. At present, all large enterprises take PTC water heating heaters to heat batteries and passenger compartments as a primary scheme, although the large enterprises have the advantages of high heating speed, simple control and the like, the large enterprises are limited by the electric-heat conversion efficiency, the COP value (coefficient of performance of the heat pump cycle) is always less than 1, and the heat pump air conditioner heating mode is adopted, so that the COP can be effectively improved, the electric quantity consumed by a battery pack is reduced, and the endurance mileage is improved.

The types of heat pump air conditioners are roughly classified into direct heat pumps, indirect heat pumps, and heat pumps with waste heat recovery, and are classified from the perspective of absorbing heat sources, and further classified into water source heat pumps and air source heat pumps. Air source heat pump as can be seen from the heat pump principle, the heat pump air conditioner absorbs and releases heat in a low-temperature environment to a passenger compartment or a heating battery, and the low-temperature adaptability of the heat pump air conditioner is limited, and the lower the ambient temperature is, the less heat the heat pump absorbs in the air is, and the limit is limited by the ambient temperature. The water source type heat pump overcomes the defect of poor low-temperature adaptability of the air source heat pump, and the temperature of the cooling liquid in the cooling system of the whole vehicle is not lower than the ambient temperature at any moment, so that the energy consumption of the high-pressure heating element can be effectively reduced if the water source heat pump is used under the low-temperature condition.

The air source heat comes from an outdoor heat exchanger in a low-temperature environment, and the heat in the low-temperature air is absorbed through heat exchange between the refrigerant and the low-temperature air. When the outdoor heat exchanger frosts or freezes, the heat exchange effect is influenced, the working efficiency of the heat pump air conditioning system is further influenced, and the water source heat pump system has the same advantages in this regard. Therefore, the water source heat pump system has certain advantages when being applied to the heat exchange process of the vehicle motor system. However, this application is achieved by using a separate PTC or by sharing the heat pump load, and the PTC heating is inefficient, which results in a complex control strategy and unstable performance of the heat pump system. In addition, most of users purchasing pure electric vehicles can use the pure electric vehicles for commuting in the city, the commuting time range is basically 20min-60min, the heat pump air conditioner can work efficiently only when the water temperature of the cooling liquid reaches a certain level, and the heat pump air conditioner absorbs the residual heat of the motor, so that the heat storage time is needed. And for the mode of combining the water source heat pump and the air source heat pump, the whole application effect is not ideal due to the improper control mode.

Disclosure of Invention

In view of this, the invention aims to provide a vehicle motor waste heat management system to improve the diversity of waste heat use forms and improve the heat management efficiency of a whole vehicle.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a vehicle motor waste heat management system, comprising:

the cooling loop is in heat exchange connection with the motor to obtain the waste heat of the motor;

the electric core unit is conducted and controllable and is connected in parallel to the cooling loop; the conduction of the battery cell unit and the cooling loop forms a first mode that the waste heat management system has the function of heating the battery cell unit;

the heat pump air-conditioning system is provided with a first controllable loop which can absorb heat in external air through a heat exchanger and is communicated with a second loop which can absorb the heat of the cooling loop through a refrigerator which is communicated with the cooling loop in parallel and is controllable in communication;

the waste heat management system has a second mode in which the cooling circuit and the refrigerator are conducted, a third mode in which the cooling circuit and the refrigerator are blocked and heat in outside air is extracted by the first circuit, and a fourth mode in which the cooling circuit, the refrigerator and the cell unit are blocked at the same time.

Further, an outlet of the cooling circuit is connected to the cell unit and the refrigerator via a controllable three-way valve.

Further, the heat pump air-conditioning system comprises a main loop device, wherein the main loop device comprises a gas-liquid separator, a compressor, a condenser and the heat exchanger which are sequentially connected in series; a stop valve is connected in series between the heat exchanger and the gas-liquid separator to form the first loop together with the main loop device; and a first electronic expansion valve and the refrigerator are connected in series between the heat exchanger and the gas-liquid separator to form the second loop together with the main loop device.

Compared with the prior art, the invention has the following advantages:

according to the vehicle motor waste heat management system, the cooling loop, the battery cell unit and the heat pump air conditioning system are connected, so that the management system has four executable modes, the requirements of different states during waste heat utilization of a vehicle motor can be met, functional conflict and interference are avoided, and the heat management efficiency of the whole vehicle is effectively improved.

The invention also provides a vehicle motor waste heat management method, which is based on the vehicle motor waste heat management system and comprises the following steps:

acquiring the temperature of the battery cell unit, the outlet temperature of the cooling loop and the ambient temperature;

judging whether the environment temperature is within a preset environment temperature threshold value interval or not;

if the ambient temperature is within the preset ambient temperature threshold range, controlling the vehicle motor waste heat management system to preferentially execute the second mode according to the requirement of the heat pump air conditioning system; otherwise, controlling the vehicle motor waste heat management system to preferentially execute the first mode according to the battery cell unit requirement.

Further, the environmental temperature threshold interval is divided into a plurality of environmental threshold partitions.

Further, when the battery cell unit needs are responded to execute the first mode, if the outlet temperature of the cooling circuit and the battery cell unit temperature are smaller than a preset temperature difference threshold value, the vehicle motor waste heat management system is controlled to execute the fourth mode.

Further, when the heat pump air conditioning system is required to execute the second mode, if the outlet temperature of the cooling circuit is lower than a preset response temperature, the vehicle motor waste heat management system is controlled to execute the fourth mode.

And further, after responding to the requirement of the heat pump air conditioning system to execute the second mode for a certain preset time, controlling the vehicle motor waste heat management system to execute the third mode.

According to the vehicle motor waste heat management method, the environment temperature is used as a basic basis for motor waste heat use control, the first mode is preferentially executed under the condition outside the environment temperature threshold interval, the battery cell unit is preferentially heated by using the motor waste heat, the second mode is preferentially executed under the condition within the environment temperature threshold interval, the heat pump air conditioning system is heated, and the motor waste heat utilization mode is optimized while the low-temperature adaptability is met.

The invention also provides a vehicle motor waste heat control device, which comprises:

the acquisition module is used for acquiring the temperature of the battery cell unit, the outlet temperature of the cooling loop and the ambient temperature;

the judging module is used for judging whether the environment temperature is within a preset environment temperature threshold value interval or not;

the execution module is used for controlling the vehicle motor waste heat management system to preferentially execute the second mode according to the requirement of the heat pump air conditioning system if the environment temperature is within a preset environment temperature threshold range under the control of the vehicle control unit; otherwise, controlling the vehicle motor waste heat management system to preferentially execute the first mode according to the battery cell unit requirement.

The invention also provides a computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the steps of the method as described above.

In addition, the invention also relates to a vehicle which is provided with the vehicle motor waste heat management system.

The vehicle motor waste heat control device, the computer readable storage medium and the vehicle have the same effects as the vehicle motor waste heat management method, and are not repeated herein.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention, and the description is given by way of example only and without limitation to the terms of relative positions. In the drawings:

fig. 1 is a block diagram of an overall structure of a vehicle motor waste heat management system according to a first embodiment of the present invention;

FIG. 2 is a flowchart illustrating a method for managing waste heat of a vehicle motor according to a second embodiment of the present invention;

fig. 3 is a block diagram of the overall structure of a vehicle motor waste heat control device according to a third embodiment of the present invention;

description of reference numerals:

1. a cooling circuit; 2. a cell unit; 3. a heat pump air conditioning system; 31. a heat exchanger; 32. a refrigerator; 33. a gas-liquid separator; 34. a compressor; 35. a condenser; 36. a second electronic expansion valve; 37. a stop valve; 38. a first electronic expansion valve; 39. a warm air loop of the air conditioning system; 4. a three-way valve; 5. a tee pipe fitting; 6. a vehicle control unit; 7. an acquisition module; 8. a judgment module; 9. and executing the module.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are to be construed as indicating or implying any particular importance.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example one

The embodiment relates to a vehicle motor waste heat management system, which is shown in fig. 1 and mainly comprises a cooling loop 1, a battery cell unit 2 and a heat pump air conditioning system 3. The cooling circuit 1 is arranged in a vehicle driving system not shown in the figure, and can adopt a cooling circuit of a motor in an existing driving system to form heat exchange with the motor to obtain waste heat of the motor, wherein the waste heat is one of heat sources of the waste heat management system; the electric core unit is conducted and controllably connected in parallel to the cooling loop, when the electric core unit and the cooling loop are conducted, heat in the cooling loop can flow through the electric core unit to heat the electric core unit, and the state is a first mode of the management system;

the heat pump air-conditioning system 3 is provided with a first loop which can be conducted controllably and absorbs heat in external air through a heat exchanger 31, and a second loop which can be conducted controllably and absorbs heat of the cooling loop through a refrigerator 32 which is connected to the cooling loop 1 in parallel;

the management system has a second mode in which the cooling circuit 1 and the refrigerator 32 are conducted, a third mode in which the cooling circuit 1 and the refrigerator 32 are blocked and heat in the outside air is extracted by the first circuit, and a fourth mode in which the cooling circuit 1, the refrigerator 32, and the cell unit 2 are blocked at the same time.

Through establishing four kinds of modes as above, can satisfy under the vehicle different states, demand when motor waste heat utilization can effectual improvement whole car thermal management efficiency.

Based on the above overall description, an exemplary specific connection structure of the present embodiment is shown in fig. 1, wherein the heat pump air conditioning system 3 includes a main loop device, the main loop device includes a gas-liquid separator 33, a compressor 34, a condenser 35 connected to a warm air loop 39 of the air conditioning system, and a heat exchanger 31, which are sequentially connected in series, and a second electronic expansion valve 36 is disposed on a pipeline between the condenser 35 and the heat exchanger 31. Based on the main loop device formed by connecting the above parts in series, a stop valve 37 is connected in series between the heat exchanger 31 and the gas-liquid separator 33, and a circulation loop formed by the stop valve 37 and the main loop device is a first loop.

A first electronic expansion valve 38 and a refrigerator 32 are connected in series between the heat exchanger 31 and the gas-liquid separator 9, and a circulation loop composed of the first electronic expansion valve 38, the refrigerant 32 and a main loop device is a second loop.

In order to allow the cell unit 2 and the refrigerator 32 to absorb heat from the cooling circuit 1, the cell unit 2 and the refrigerator 32 are connected in parallel to the cooling circuit 1. In order to selectively conduct the cell unit 2 or the refrigerator 32, the cell unit 2 and the refrigerator 32 are coupled to a pipe at one end of the cooling circuit 1 by a three-way valve 4, and downstream port pipes of the cell unit 2 and the refrigerator 32 are coupled to the other end of the cooling circuit 1 by a three-way pipe 5.

As can be seen from the above structure, by controlling the opening and closing of the three-way valve 4, the heat transfer control between the cooling circuit 1 and the battery pack 2 or the refrigerator 32 can be formed; the flow rate in the path can be adjusted by adjusting the shutoff valve 37, the first electronic expansion valve 38, and the second electronic expansion valve 36.

Therefore, in order to realize the first mode, the three-way valve 4 may be controlled to turn on the circuit between the cooling circuit 1 and the cell unit 2, and turn off the circuit between the cooling circuit 1 and the refrigerator 32, at this time, the heat of the cooling circuit 1 is transferred to the cell unit 2 through the circuit, so as to realize the mode of heating the cell unit 2 by using the residual heat of the motor.

The three-way valve 4 is controlled to close the loop between the cooling loop 1 and the electric core unit 2, the cooling loop 1 and the refrigerator 32 are conducted, at this time, the cooling liquid in the cooling loop 1 passes through the refrigerator 32 via the three-way valve 4, heat is transferred to the refrigerator 32, and then the cooling liquid flows back into the cooling loop 1 via the three-way pipe 5. At this time, the refrigerant of the heat pump air conditioning system 3 circulates through the second circuit, and at this time, because of the conductive state of the cooling circuit 1 and the refrigerator 32, the heat of the cooling circuit 1 is transferred to the refrigerator 32, and then the heat is introduced into the heat pump air conditioning system 3 through the circulation of the second circuit, thereby realizing the second mode in which the heat pump air conditioning system 3 absorbs the residual heat of the motor.

Through controlling three-way valve 4, make between cooling circuit 1 and the refrigerant 32 disconnection intercommunication, at this moment, cooling circuit 1's heat can not transmit for refrigerator 32, control stop valve 37, and heat pump air conditioning system 3 circulates through first return circuit, absorbs the air circumstance heat through heat exchanger 31 to in introducing heat to heat pump air conditioning system 3 through first return circuit, realize the third mode that heat pump air conditioning system 3 absorbed the air circumstance heat.

Further, by controlling the three-way valve 4, the three-way valve 4 is simultaneously made to disconnect the communication with the cell unit 2 and the refrigerator 32. At this time, the coolant in the heat pump air conditioning system self-circulates along the second circuit, and the fourth mode of heat storage in the cooling circuit is realized where the heat of the cooling circuit 1 is not transferred.

Example two

The embodiment is based on a vehicle motor waste heat management system of the first embodiment, and relates to a vehicle motor waste heat management method, which mainly comprises the following steps in the whole idea:

acquiring the temperature of the battery cell unit 2, the outlet temperature of the cooling circuit 1 and the ambient temperature;

judging whether the ambient temperature is within a preset ambient temperature threshold interval or not;

if the ambient temperature is within the preset ambient temperature threshold range, controlling the vehicle motor waste heat management system of the first embodiment to preferentially execute the second mode according to the requirement of the heat pump air conditioning system; otherwise, the vehicle motor waste heat management system according to the first embodiment is controlled to preferentially execute the first mode according to the requirement of the battery cell unit 2.

Through the description of the whole method, the environment temperature Tam is taken as a basis, the mode preferentially executed by the whole management system is controlled through the comparison between the environment temperature Tam and the preset environment threshold interval, and the use management control of the motor waste heat inside and outside the environment threshold interval can be better.

Based on the above overall concept, the preset threshold range of the ambient temperature for this embodiment is-20 ℃ to 5 ℃. If the ambient temperature Tam is lower than-20 ℃ or higher than 5 ℃, if the cell unit 2 has a heating requirement, the first mode is preferentially started to heat the cell unit 2, and if the cell unit 2 does not have the heating requirement, the second mode can be executed.

In addition, in this embodiment, the environmental temperature threshold interval is divided into two environmental threshold sub-intervals, which are-20 ℃ to-12 ℃ respectively; -12 ℃ to 5 ℃. The setting of a plurality of environmental threshold value partitions can further refine the working interval of the heat pump air conditioning system for absorbing the water source heat and the air source heat, and ensure the reasonable and efficient utilization of the motor waste heat.

Furthermore, based on the above overall description, in the overall management method, based on the first mode and the second mode that are preferentially executed, when the first mode is executed, if the outlet temperature of the cooling circuit 1 and the minimum cell temperature Tbmin of the cell unit 2 are less than the preset temperature difference threshold, the vehicle motor waste heat management system may be controlled to execute the fourth mode, so as to realize heat storage of the cooling circuit 1, and further facilitate the heating effect of the cell unit 2.

Similarly, when the second mode is executed, if the outlet temperature of the cooling circuit 1, that is, the temperature Tmt of the cooling liquid at the outlet is less than the preset response temperature, that is, the residual heat of the cooling circuit 1 is not enough to support the execution of the second mode, the vehicle motor residual heat management system is controlled to execute the fourth mode, so that after the cooling circuit 1 stores heat, the heating of the heat pump air conditioning system 3 is facilitated.

In addition, after the second mode is executed for a certain time, the vehicle motor waste heat management system can be controlled to execute the third mode, so that the heat pump air conditioning system 3 absorbs the air source heat, the motor waste heat is used for heating the battery cell unit 2, and the discharge power and the discharge capacity of the battery cell unit are further increased.

As can be seen from the above description, through the alternative selection control of the four modes of the whole system, a multi-gradient control form can be formulated on the premise of taking the ambient temperature as a basic parameter, and the reasonable and efficient utilization of the waste heat of the motor is ensured.

In order to facilitate the deep understanding of the design concept of the invention, as shown in fig. 2, the environmental threshold temperature interval is-20 ℃ to 5 ℃ as an example, at this time, the environmental temperature threshold interval is divided into two environmental threshold sub-intervals, which are respectively-20 ℃ to-12 ℃; an exemplary management method based on the setting of the environmental threshold temperature interval is described in detail below with reference to fig. 2.

Firstly, the vehicle state is judged based on a Vehicle Control Unit (VCU), and if the vehicle is in a Ready state (During Ready) such as no starting, the waste heat of the motor is not utilized at the moment. Otherwise, executing the vehicle motor waste heat management method. When the vehicle motor waste heat management method is executed, the ambient temperature Tam is firstly acquired so as to judge the ambient temperature.

Firstly, when the ambient temperature Tam is less than or equal to minus 20 ℃.

Under this condition, the motor waste heat preferentially adopts the first mode for heating the electric core unit, and when the electric core unit has no heating demand, the heat pump air conditioning system absorbs the heat of the motor waste heat through the second mode.

At this ambient temperature, the electric core unit 2 is preferentially heated by the motor waste heat. For whether the cell unit 2 has a heating requirement, a cell heating threshold value at which the cell unit 2 needs to be heated may be set, in this embodiment, the cell heating threshold value in this case is-10 ℃, that is, when the lowest cell temperature Tbmin is less than or equal to-10 ℃, it represents that the cell unit 2 has the heating requirement, at this time, the heating of the cell unit 2 is performed in the first mode, and after the cell unit 2 is heated to a preset value, the heating may be stopped, and in this embodiment, after the cell unit 2 is heated to 5 ℃, the execution of the first mode is stopped.

In order to further improve the heating effect on the electric core unit 2, if the outlet temperature of the cooling circuit 1 and the minimum electric core temperature Tbmin of the electric core unit 2 are less than the preset temperature difference threshold, the vehicle motor waste heat management system may be controlled to execute the fourth mode, so as to realize heat storage on the cooling circuit 1. Based on this, in this environment temperature of the embodiment, the temperature difference threshold is set to 5 ℃, that is, if the cell unit 1 has a heating request, it needs to be determined whether the difference between the outlet coolant temperature Tmt of the cooling circuit 1 and the cell minimum temperature Tbmin of the cell unit 2 is greater than 5 ℃, and if the difference is greater than 5 ℃, the first mode may be executed; and if the temperature is lower than 5 ℃, executing a fourth mode to enable the cooling circuit 1 to store heat until the difference between the outlet cooling liquid temperature of the cooling circuit 1 and the lowest cell temperature Tbmin of the cell unit 2 is higher than 5 ℃, and then executing the first mode to heat the cell unit 2.

If the electric core unit 2 does not need to be heated, for example, the vehicle drives after the charging is finished at the low ring temperature or activates the inserting, robbing and heat preservation functions in a standing state. At this time, if the heat pump air conditioning system 3 has a demand, the heat pump air conditioning system can absorb the residual heat of the motor, and when the heat pump air conditioning has a request for absorbing the residual heat of the motor and the battery pack has no heating request, the vehicle control unit enables the heat pump air conditioning system to absorb the residual heat of the motor and executes the second mode.

In order to achieve a better heating effect for the heat pump air conditioning system during the execution of the second mode, it is necessary to judge the relationship between the temperature Tmt of the coolant at the outlet of the cooling circuit 1 and the preset response temperature, which is set to-15 ℃ in this ambient temperature case as in the present embodiment. If the outlet temperature Tmt of the cooling circuit 1 is higher than the response temperature of-15 ℃, at this time, the stop valve 37 in the first circuit is closed, and the first electronic expansion valve 38 in the second circuit is opened to a proper opening degree, so as to execute the second mode that the heat pump air conditioning system 3 absorbs the residual heat of the motor. And if the outlet temperature Tmt of the cooling circuit 1 is lower than the response temperature of minus 15 ℃, the air conditioning system controller forbids to open the first electronic expansion valve, closes the three-way valve 4 at the same time, enters a fourth mode, and executes the second mode until the outlet temperature Tmt of the cooling liquid of the cooling circuit 1 is higher than the response temperature of minus 15 ℃.

Secondly, when the ambient temperature is more than 20 ℃ below zero and less than Tam and less than or equal to 12 ℃ below zero.

In this environment temperature range, the general heat pump air conditioning system 3 cannot absorb the heat of the air source, and can only work by absorbing the heat of the waste heat of the motor. The motor waste heat is limited, and can be used to heat electric core unit 2, but this ring temperature heats electric core unit 2 down, and it is not obvious to electric core unit 2's temperature promotion effect, and it is shorter to consider that actual user single uses car time, and the motor waste heat is whole to be used for heat pump air conditioning system under this ambient temperature, can effectively reduce air conditioning system energy consumption. Specifically, the method comprises the following steps:

at this ambient temperature, the motor waste heat is only used for the heat pump air conditioning system, and considering the working efficiency of the heat pump air conditioning system, the outlet coolant temperature Tmt of the cooling circuit 1 reaches a certain level, and then the heat pump air conditioning can be activated to absorb the motor waste heat.

Thirdly, the environmental temperature is more than 12 ℃ below zero and less than or equal to 5 ℃ of Tam

At the environment temperature, the heat pump air conditioning system can absorb the waste heat of the motor to work and can also absorb the heat in the air to work. The motor waste heat is preferentially used for heating the heat pump air conditioner, the heat pump air conditioner system can be controlled to continue for a certain time, for example, the time lasts for 30min, the heat pump air conditioner system absorbs the heat of the motor waste heat before 30min, namely, the second mode is executed for heating the passenger compartment, and the heat pump air conditioner system absorbs the heat in the environment after 30min, namely, the third mode is executed for maintaining the temperature, so that the energy consumption of the air conditioner system is reduced.

Specifically, at this ambient temperature, the motor waste heat is preferentially used for the heat pump air conditioning system, and in this temperature interval, the control performs heat treatment on the heat pump air conditioning system 3 by combining the second mode and the third mode, so that, in the case of enabling the heat pump air conditioning system with a waste heat demand, it is necessary to determine the relationship between the outlet temperature Tmt of the cooling circuit 1 and the preset response temperature to determine whether to start the second mode.

At this time, in order to better realize the combined use of the second mode and the third mode, in the threshold interval of the ambient temperature, the preset response temperature may be set to a summation value of the temperature difference and the ambient temperature Tam, that is, whether the difference between the cooling circuit outlet cooling temperature Tmt and the ambient temperature Tam is greater than the temperature difference, so as to perform the enabling judgment of the second mode start. In a specific exemplary scheme, the temperature difference may be set to 4 ℃, that is, the preset response temperature is the current ambient temperature Tam +4 ℃, that is, whether the difference between the cooling circuit outlet coolant temperature Tmt and the ambient temperature Tam is greater than 4 ℃ is judged.

And if the temperature Tmt-ambient temperature Tam of the cooling liquid at the outlet of the cooling circuit 1 is less than or equal to 4 ℃, executing a fourth mode to store heat of the cooling circuit 1, executing a second mode until the temperature Tmt-ambient temperature Tam of the cooling liquid at the outlet of the cooling circuit 1 is more than or equal to 4 ℃, controlling the first electronic expansion valve 38 to be opened to a proper opening degree by the air-conditioning system controller, closing the stop valve 37, executing a second mode for absorbing the residual heat of the motor by the heat pump air-conditioning system, and starting to record the execution time t of the second mode.

When the time record t is more than 30min, the vehicle control unit does not enable the heat pump air-conditioning system 3 to absorb the request of the residual heat of the motor any more, so that the heat pump air-conditioning system 3 starts the absorption work of the environmental heat, and at the moment, the heat pump air-conditioning system 3 is controlled to execute the third mode.

On the premise, since the residual heat in the cooling circuit 1, that is, the residual heat of the motor, is in an unused state, if the electric core unit 2 has a heating request at this time, the first mode is executed, and the electric core unit 2 is heated by the residual heat of the motor.

When it is determined whether the cell unit 2 has a heating request, in the environmental temperature threshold interval, the set cell heating threshold of the cell unit 2 that needs to be heated is 10 ℃, that is, when the lowest cell temperature Tbmin is less than or equal to 10 ℃, it indicates that the cell unit 2 has a heating requirement.

Based on the heating request of the electric core unit 2, it needs to be determined whether the temperature of the cooling liquid at the outlet of the cooling circuit 1 meets the requirement for heating the electric core unit 2, and at this time, a temperature difference threshold still needs to be set, and the temperature difference threshold set in the environmental temperature threshold interval in this embodiment is 5 ℃. If the difference between the temperature Tmt of the cooling liquid at the outlet of the cooling circuit 1 and the minimum temperature Tbmin of the electric core unit 2 is less than the temperature difference threshold value 5 ℃, at this time, a fourth mode needs to be executed to store heat for the cooling circuit 1 until the difference between the temperature Tmt of the cooling liquid at the outlet of the cooling circuit 1 and the minimum temperature Tbmin of the electric core unit 2 is greater than the temperature difference threshold value 5 ℃, the first mode is executed to heat the electric core unit 2, and the first mode is exited until the temperature of the electric core unit 2 reaches 15 ℃.

Fourthly, when the ambient temperature Tam is more than 5 DEG C

Within the threshold interval of the environmental temperature, the motor waste heat is preferentially used for heating the electric core unit 2, when the electric core unit 2 has no heating demand, the heat pump air conditioning system 3 absorbs the motor waste heat, and at the environmental temperature, the heat pump air conditioning system absorbs the motor waste heat, so that the active air inlet grille and the electronic fan can be closed, the wind resistance coefficient of the whole vehicle is reduced, and the energy consumption of heat dissipation accessories is reduced.

Specifically, a cell heating threshold at the ambient temperature is set, and if the cell heating threshold is set to 10 ℃, that is, when Tbmin of the cell unit is less than or equal to 10 ℃, the cell unit 2 has a heating requirement.

When the electric core unit 2 has a heating demand, it needs to be determined whether the temperature of the cooling liquid at the outlet of the cooling circuit 1 meets the requirement for heating the electric core unit 2, and therefore, a temperature difference threshold still needs to be set, and the temperature difference threshold set in the environment temperature threshold interval is 5 ℃. If the difference between the temperature Tmt of the cooling liquid at the outlet of the cooling circuit 1 and the minimum temperature Tbmin of the electric core unit 2 is less than the temperature difference threshold value 5 ℃, at this time, a fourth mode needs to be executed to store heat for the cooling circuit 1 until the difference between the temperature Tmt of the cooling liquid at the outlet of the cooling circuit 1 and the minimum temperature Tbmin of the electric core unit 2 is greater than the temperature difference threshold value 5 ℃, the first mode is executed to heat the electric core unit 2, and the first mode is exited until the temperature of the electric core unit 2 reaches 15 ℃.

In this ambient temperature threshold interval, if the electric core unit 2 does not need to be heated, that is, the vehicle is in a state of driving after the charging is finished or in a state of standing at a low ambient temperature, such as a plug-in heat preservation function and the like, if the heat pump air conditioning system 3 has a demand for absorbing the waste heat of the motor and the whole vehicle cooling system does not have a request for opening the electronic fan and the active air intake grille, the second mode can be controlled to be executed, so that the heat pump air conditioning system 3 can absorb the waste heat of the motor, and at this time, after the air conditioning system controller receives the enable signal, the first electronic expansion valve 38 is controlled to be opened to a proper opening degree, the stop valve 37 is closed, and the function of absorbing the waste heat of the motor by the heat pump air conditioning system is executed.

EXAMPLE III

The embodiment relates to a vehicle motor waste heat control device, which realizes control of a vehicle motor waste heat management system of the first embodiment, and as shown in fig. 3, the control device mainly comprises a vehicle control unit 6, an acquisition module 7, a judgment module 8 and an execution module 9. The vehicle control unit 6 is used to control the entire apparatus, and may be a control device of an existing vehicle or a controller structure having a logic processing function. The acquisition module 7 is configured to acquire the temperature of the electric core unit 2, the outlet temperature of the cooling circuit 1, and the ambient temperature, and may employ a temperature sensor to transmit each acquired temperature to the vehicle controller 6; the judging module 8 is configured to judge whether the ambient temperature acquired by the acquiring module 7 is within a preset ambient temperature threshold interval; the execution module 9 is controlled by the vehicle control unit 6 to execute each mode, wherein if the ambient temperature is within a preset ambient temperature threshold interval, the vehicle motor waste heat management system is controlled to preferentially execute a second mode according to the requirement of the heat pump air conditioning system 3; otherwise, controlling the vehicle motor waste heat management system to preferentially execute the first mode according to the requirement of the battery cell unit 2.

Example four

The present embodiment relates to a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the steps of the vehicle motor waste heat management method according to the second embodiment.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A vehicle motor waste heat management system, characterized in that this waste heat management system includes:

the cooling loop (1) is in heat exchange connection with the motor to obtain the waste heat of the motor;

the electric core unit (2) is conducted and controllably connected to the cooling loop (1) in parallel; the conduction of the battery cell unit (2) and the cooling loop (1) forms a first mode that the waste heat management system has to heat the battery cell unit (2);

the heat pump air conditioning system (3) is provided with a first controllable-conduction loop which absorbs heat in external air through a heat exchanger (31) and a second loop which absorbs the heat of the cooling loop (1) through a refrigerator (32) which is controllable in conduction and connected to the cooling loop in parallel;

the waste heat management system has a second mode for conducting the cooling loop (1) and the refrigerator (32), a third mode for blocking the cooling loop (1) and the refrigerator (32) and absorbing heat in external air by the first loop, and a fourth mode for blocking the cooling loop (1), the refrigerator (32) and the cell unit (2) at the same time.

2. The vehicle motor waste heat management system of claim 1, wherein: an outlet of the cooling circuit (1) is connected to the cell unit (2) and the refrigerator (32) via a controllable three-way valve (4).

3. The vehicle motor waste heat management system of claim 1, wherein: the heat pump air-conditioning system comprises a main loop device, wherein the main loop device comprises a gas-liquid separator (33), a compressor (34), a condenser (35) and the heat exchanger (31) which are sequentially connected in series; a stop valve (37) is connected in series between the heat exchanger (31) and the gas-liquid separator (33) to form the first loop together with the main loop device; a first electronic expansion valve (38) and the refrigerator (32) are connected in series between the heat exchanger (31) and the gas-liquid separator (33) to form the second loop together with the main loop device.

4. A vehicle motor waste heat management method, characterized in that the method is based on the vehicle motor waste heat management system according to any one of claims 1 to 3, comprising the steps of:

acquiring the temperature of the battery cell unit (2), the outlet temperature of the cooling circuit (1) and the ambient temperature;

if the ambient temperature is within a preset ambient temperature threshold range, controlling the vehicle motor waste heat management system to preferentially execute the second mode according to the requirement of the heat pump air conditioning system (3); otherwise, controlling the vehicle motor waste heat management system to preferentially execute the first mode according to the requirement of the battery cell unit (2).

5. The vehicle motor waste heat management method according to claim 4, characterized in that: the ambient temperature threshold interval is divided into a plurality of ambient threshold sub-intervals.

6. The vehicle motor waste heat management method according to claim 4, characterized in that: and when the demand of the battery cell unit (2) is responded to execute the first mode, if the outlet temperature of the cooling circuit (1) and the temperature of the battery cell unit (2) are smaller than a preset temperature difference threshold value, controlling the vehicle motor waste heat management system to execute the fourth mode.

7. The vehicle motor waste heat management method according to claim 4, characterized in that: and when the second mode is executed in response to the requirement of the heat pump air-conditioning system (3), if the outlet temperature of the cooling circuit (1) is lower than the preset response temperature, controlling the vehicle motor waste heat management system to execute the fourth mode.

8. The vehicle motor waste heat management method according to claim 4, characterized in that: and after responding to the requirement of the heat pump air conditioning system (3) to execute the second mode for a certain preset time, controlling the vehicle motor waste heat management system to execute the third mode.

9. A vehicle motor waste heat control device is characterized by comprising:

an acquisition module (7) which acquires the temperature of the cell unit (2), the outlet temperature of the cooling circuit (1) and the ambient temperature;

the judging module (8) is used for judging whether the environment temperature is within a preset environment temperature threshold value interval or not;

the execution module (9) is used for controlling the vehicle motor waste heat management system to preferentially execute the second mode according to the requirement of the heat pump air conditioning system (3) if the ambient temperature is within a preset ambient temperature threshold range under the control of the vehicle controller (6); otherwise, controlling the vehicle motor waste heat management system to preferentially execute the first mode according to the requirement of the battery cell unit (2).

10. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the steps of the method according to any one of claims 4 to 8.

11. A vehicle characterized in that it is equipped with a vehicle motor waste heat management system as claimed in any one of claims 1 to 3.