CN113879073B - A vehicle thermal management system based on forward and reverse electric cards and its control method - Google Patents

Abstract

The invention discloses a vehicle thermal management system based on a positive and a negative electric cards and a control method thereof. The device consists of an outer circulation and an inner circulation, wherein the two circulation layers are synchronously and reversely carried out. In the refrigeration mode, an electric field is applied, normal-temperature fluid passes through the positive electricity card and absorbs heat to become high-temperature fluid, and then the high-temperature fluid exchanges heat with the high-temperature heat exchanger to become normal-temperature fluid; after the electric field is removed, the electric field is reversed, the heat is released to become low-temperature fluid, and the low-temperature fluid absorbs heat from the low-temperature heat exchanger to become normal-temperature fluid. When in a heating mode, an electric field is applied, normal-temperature fluid firstly passes through a reverse electric card and releases heat to become low-temperature fluid, and then exchanges heat with a low-temperature heat exchanger to become normal-temperature fluid; after the electric field is removed, the electric field passes through the positive electrode card and absorbs heat to become high-temperature fluid, and the high-temperature fluid releases heat to the high-temperature heat exchanger to become normal-temperature fluid. The invention has no moving parts, skillfully compensates the short plates in the prior art, has simple structure, convenient use, cleanness and environmental protection.

Description

A vehicle thermal management system based on forward and reverse electric cards and its control method

Technical field

The invention belongs to the field of refrigeration and low-temperature engineering, and specifically relates to a vehicle thermal management system based on a forward and reverse electric card and a control method thereof.

Background technique

As a traditional refrigeration technology, vapor compression refrigeration has been widely used in production and life such as industrial refrigeration, food preservation and air conditioning systems. However, vapor compression technology also has problems such as environmental damage, low efficiency, and bulky equipment. As the level of scientific and technological development continues to improve and people pay more attention to energy conservation, emission reduction, and environmental protection, the development of efficient and environmentally friendly refrigeration technology has become the mainstream direction of current research.

As a new refrigeration method, electric card refrigeration technology has attracted people's attention due to its advantages such as high efficiency, environmental protection and easy miniaturization. When an electric field is applied and removed in a dielectric material, the polarization state of the internal dipole will change. Under adiabatic conditions, the temperature of the material will change accordingly. For positive electric card materials, when an electric field is applied, the material temperature will increase, and when the electric field is removed, the material temperature will decrease; for reverse electric card materials, when an electric field is applied, the material temperature will decrease, and when the electric field is removed, the material temperature will decrease. The material temperature will increase.

Although compared with vapor compression refrigeration, electric card refrigeration has higher efficiency and does not emit any greenhouse gases. However, the current main research on electric card refrigeration devices is mainly focused on the development of electric card materials and the testing stage of the electric card effect. There are fewer studies on the system level. Most of the existing electric card refrigeration equipment needs to realize the exchange process of heat and cold through the movement or rotation of the electric card components. However, the stability of this design is poor, it is difficult to use on mobile equipment such as vehicles, and the solid contact The surface heat transfer method is single and the heat exchange efficiency is low, so it has not been widely used in production and life.

Contents of the invention

In view of the imperfect design and development of the existing electric card refrigeration system, the present invention proposes a vehicle thermal management system and its control method based on forward and reverse electric cards. This system can operate without moving or rotating the electric card material. Realizing the heat exchange process with the outside world cleverly makes up for the shortcomings of the existing technology, and the device has a simple structure, is easy to use, and has good cooling effect. The technical solution of the present invention is as follows:

A vehicle thermal management system based on a forward and reverse electric card, including an outer circulation pipeline and an inner circulation pipeline;

The outer circulation pipeline includes a first circulation pump, a first heat exchanger, a second electrical card pipeline, a fourth heat exchanger, and a first electrical card pipeline in order, forming a closed circulation pipeline through the pipelines;

The inner circulation pipeline includes a second circulation pump, a second heat exchanger, a second electrical card pipeline, a third heat exchanger, and a first electrical card pipeline in order, forming a closed circulation pipeline through the pipelines;

The first positive electric card and the first reverse electric card are connected in parallel through the control valve to form the first electric card pipeline;

The second positive electric card and the second reverse electric card are connected in parallel through the control valve to form a second electric card pipeline;

The first electric card pipeline and the second electric card pipeline are connected in series to the inner circulation pipeline and the outer circulation pipeline respectively through control valves;

The first circulation pump is connected in parallel with the first reversing valve;

The second circulation pump is connected in parallel with the second reversing valve.

The above-mentioned control method of a vehicle thermal management system based on a forward and reverse electric card provides pulse voltage to the electric card material through the power supply to realize the heat exchange process;

It includes two loops, the inner loop and the outer loop, and the two loops are performed in reverse at the same time;

The outer circulation is driven by the first circulation pump and passes through the first and fourth heat exchangers; the inner circulation is driven by the second circulation pump and passes through the second and third heat exchangers;

Each cycle consists of two parts of the process. The stage in which the electric field is applied to both ends of the electric card material is named the first half of the cycle, and the stage in which the electric field is removed from both ends of the electric card material is named the second half of the cycle.

Including two working modes: cooling mode and heating mode.

In cooling mode:

The first and second heat exchangers are used as low-temperature heat exchangers, and the third and fourth heat exchangers are used as high-temperature heat exchangers. At this time, the outer circulation flows from the fourth heat exchanger to the first exchanger. The heat exchanger circulates, and the inner circulation flows from the second heat exchanger to the third heat exchanger;

In the first half of the cycle in cooling mode, the power supply applies an electric field to the electric card material. During this process, the first positive electric card and the second positive electric card are both at high temperature, and the first reverse electric card and the second reverse electric card are both at low temperature. state;

In the outer circulation, the normal temperature fluid first enters the first positive electric card through the first circulation pump, absorbs the heat of the first positive electric card and becomes a high-temperature fluid, then enters the high-temperature fourth heat exchanger, and releases heat to the high-temperature fourth heat exchanger to become The normal temperature fluid then enters the second reverse electric card, emits heat to the second reverse electric card to become a low-temperature fluid, and finally enters the first low-temperature heat exchanger, absorbs heat from the first low-temperature heat exchanger and becomes a normal temperature fluid, completing the cycle;

In the inner circulation, the normal temperature fluid first enters the second positive electric card, absorbs the heat of the second positive electric card and becomes a high-temperature fluid, then enters the high-temperature third heat exchanger, releases heat to the high-temperature third heat exchanger and becomes a normal temperature fluid, and then enters The first reverse electric card releases heat to the first reverse electric card to become a low-temperature fluid. Finally, it enters the second low-temperature heat exchanger through the second circulation pump, and absorbs heat from the second low-temperature heat exchanger to become a normal temperature fluid, completing the cycle.

In the second half of the refrigeration cycle in the refrigeration mode, the power supply removes the electric field at both ends of the electric card material. During this process, the first positive electric card and the second positive electric card are in a low temperature state, and the first reverse electric card and the second reverse electric card are all in a high temperature state;

In the outer circulation, the normal temperature fluid first enters the first reverse electric card through the first circulation pump, absorbs the heat of the first reverse electric card and becomes a high-temperature fluid, then enters the high-temperature fourth heat exchanger, and releases heat to the high-temperature fourth heat exchanger to become high-temperature fluid. The normal temperature fluid then enters the second positive electric card, emits heat to the second positive electric card to become a low-temperature fluid, and finally enters the first low-temperature heat exchanger, absorbs heat from the first low-temperature heat exchanger and becomes a normal-temperature fluid, completing the cycle;

In the inner circulation, the normal temperature fluid first enters the second reverse electric card, absorbs the heat of the second reverse electric card and becomes a high temperature fluid, then enters the high temperature third heat exchanger, releases heat to the high temperature third heat exchanger and becomes a normal temperature fluid, and then enters The first positive electric card emits heat to the first positive electric card to become a low-temperature fluid. Finally, it enters the second low-temperature heat exchanger through the second circulation pump, and absorbs heat from the second low-temperature heat exchanger to become a normal-temperature fluid, completing the cycle.

In heating mode:

The first and second heat exchangers are used as high-temperature heat exchangers, and the third and fourth heat exchangers are used as low-temperature heat exchangers. At this time, the outer circulation flows from the fourth heat exchanger to the first exchanger. The heat exchanger circulates, and the inner circulation flows from the third heat exchanger to the second heat exchanger;

In the first half of the cycle in heating mode, the power supply applies an electric field to the electric card material. During this process, the first positive electric card and the second positive electric card are both in a high temperature state, and the first reverse electric card and the second reverse electric card are both in a high temperature state. low temperature state;

In the outer circulation, the normal temperature fluid first enters the second reverse electric card, releases heat to the second reverse electric card and becomes a low-temperature fluid, then enters the fourth low-temperature heat exchanger, absorbs heat from the fourth low-temperature heat exchanger and becomes a normal temperature fluid, and then enters The first positive electric card absorbs heat from the first positive electric card to become a high-temperature fluid, which finally enters the high-temperature first heat exchanger through the first circulation pump and releases heat to the high-temperature first heat exchanger to become a normal-temperature fluid, completing the cycle;

In the inner circulation, the normal temperature fluid first enters the first reverse electric card through the second circulation pump, releases heat to the first reverse electric card and becomes a low-temperature fluid, then enters the third low-temperature heat exchanger, and absorbs heat from the third low-temperature heat exchanger to become a low-temperature fluid. The normal temperature fluid then enters the second positive electric card, absorbs heat from the second positive electric card and becomes a high-temperature fluid. Finally, it enters the high-temperature second heat exchanger and releases heat to the high-temperature second heat exchanger to become a normal temperature fluid, completing the cycle.

In the second half of the cycle in heating mode, the power supply removes the electric field at both ends of the electric card material; during this process, the first positive electric card and the second positive electric card are in a low temperature state, and the first reverse electric card and the second reverse electric card are all in a high temperature state;

In the outer circulation, the normal temperature fluid first enters the second positive electric card, releases heat to the second positive electric card and becomes a low-temperature fluid, then enters the fourth low-temperature heat exchanger, absorbs heat from the fourth low-temperature heat exchanger and becomes a normal temperature fluid, and then enters The first reverse electric card absorbs heat from the first reverse electric card to become a high-temperature fluid, and finally enters the high-temperature first heat exchanger through the first circulation pump, and releases heat to the high-temperature first heat exchanger to become a normal-temperature fluid, completing the cycle;

In the inner circulation, the normal temperature fluid first enters the first positive electric card through the second circulation pump, releases heat to the first positive electric card and becomes a low-temperature fluid, then enters the third low-temperature heat exchanger, and absorbs heat from the third low-temperature heat exchanger to become a low-temperature fluid. The normal temperature fluid then enters the second reverse electric card, absorbs heat from the second reverse electric card and becomes a high-temperature fluid. Finally, it enters the high-temperature second heat exchanger and releases heat to the high-temperature second heat exchanger to become a normal temperature fluid, completing the cycle.

In the present invention, the heat transfer fluid flows through the positive electric card, the reverse electric card, the high-temperature heat exchanger and the low-temperature heat exchanger through the pipes driven by the circulation pump. The system consists of an outer circulation and an inner circulation. The two-layer circulation proceeds simultaneously and in reverse direction. The rotation direction of the two circulation pumps is fixed. The circulation pump and the reversing valve are connected through pipelines. The circulation is controlled by adjusting the four-way reversing valve. direction. The external power supply applies synchronous pulse electric fields to the forward and reverse electric card devices, and the electric field intensity changes periodically. For the positive electric card, it is in a high temperature state when an electric field is applied. At this time, the normal temperature fluid flows through the positive electric card, absorbing heat and the temperature rises; after the electric field is removed, it is in a low temperature state, and the normal temperature fluid flows through the positive electric card and releases heat and the temperature decreases. For the reverse electric card, it is in a low temperature state when an electric field is applied. At this time, the normal temperature fluid flows through the reverse electric card and the heat released is lowered. After the electric field is removed, it is in a high temperature state. The normal temperature fluid flows through the reverse electric card and absorbs heat and the temperature rises. Within a cycle of changes in electric field strength, the positive electric card will go through the change process of normal temperature - high temperature - normal temperature - low temperature, while the reverse electric card will go through the change process of normal temperature - low temperature - normal temperature - high temperature.

The invention is divided into two working modes according to vehicle requirements, namely cooling mode and heating mode, and switching between the two modes is achieved by adjusting the direction of the reversing valve. In the cooling mode, an electric field is applied, and the normal temperature fluid first passes through the positive electric card and absorbs heat to become a high temperature fluid, then releases heat to the high temperature heat exchanger and becomes a normal temperature fluid, then passes through the reverse electric card and releases heat to become a low temperature fluid, and finally exchanges heat from the low temperature. The heat exchanger absorbs heat and becomes a normal temperature fluid; when the electric field is removed, the normal temperature fluid first passes through the reverse current card and absorbs heat to become a high temperature fluid, then releases heat to the high temperature heat exchanger to become a normal temperature fluid, then passes through the positive current card and releases heat to become a low temperature fluid, and finally from The low-temperature heat exchanger absorbs heat and becomes a normal temperature fluid. In heating mode, when an electric field is applied, the normal-temperature fluid first passes through the reverse electric card and releases heat to become a low-temperature fluid, then absorbs heat from the low-temperature heat exchanger and becomes a normal-temperature fluid, then passes through the positive electric card and absorbs heat to become a high-temperature fluid, and finally exchanges to high temperature. The heater releases heat and becomes a normal temperature fluid; when the electric field is removed, the normal temperature fluid first passes through the positive electric card and releases heat to become a low temperature fluid, then absorbs heat from the low temperature heat exchanger to become a normal temperature fluid, then passes through the reverse electric card and absorbs heat to become a high temperature fluid, and finally It releases heat to the high temperature heat exchanger and becomes a normal temperature fluid. Compared with existing devices, the present invention has a simple structure, is easy to use, is clean and environmentally friendly, has no moving parts, breaks existing technical barriers, and has a wider scope of application.

Description of the drawings

Figure 1 is a schematic structural diagram of the system shown in the present invention;

Figure 2 is a variation diagram of the power supply voltage in the present invention;

Figure 3 is a schematic diagram of the system state of the first half of the cycle when the present invention is in the summer refrigeration state;

Figure 4 is a schematic diagram of the system state of the second half of the cycle when the present invention is in the summer cooling state;

Figure 5 is a schematic diagram of the system state of the first half of the cycle when the present invention is in the heating state in winter;

Figure 6 is a schematic diagram of the system state during the second half of the cycle when the present invention is in the heating state in winter.

Detailed ways

The working process of the vehicle thermal management system based on the forward and reverse electric card will be described in detail below with reference to the drawings in the embodiment of the present invention.

As shown in Figure 1, a vehicle thermal management system based on forward and reverse electric cards includes an outer circulation pipeline and an inner circulation pipeline;

The outer circulation pipeline includes the first circulation pump 9, the first heat exchanger 1, the second electrical card pipeline, the fourth heat exchanger 4, and the first electrical card pipeline in order, forming a closed circulation pipeline through the pipelines;

The inner circulation pipeline includes the second circulation pump 10, the second heat exchanger 2, the second electric card pipeline, the third heat exchanger 3, and the first electric card pipeline in order, forming a closed circulation pipeline through the pipes;

The first positive electric card 5 and the first reverse electric card 6 are connected in parallel through the control valve to form the first electric card pipeline;

The second positive electric card 7 and the second reverse electric card 8 are connected in parallel through the control valve to form a second electric card pipeline;

The first electric card pipeline and the second electric card pipeline are connected in series to the inner circulation pipeline and the outer circulation pipeline respectively through control valves;

The first circulation pump 9 is connected in parallel with the first reversing valve 11;

The second circulation pump 10 is connected in parallel with the second reversing valve 12 .

The details of this embodiment are:

As shown in Figure 1, it includes thirteen control valves 13, fourteen control valves 14, fifteen control valves 15, sixteen control valves 16, seventeen control valves 17, eighteen control valves 18, nineteen control valves 19, and twenty control valves. Valve 20, 21 control valve 21, 22 control valve 22, 23 control valve 23, 24 control valve 24, 25 control valve 25, 26 control valve 26, 27 control valve 27, 28 control valve 28 ;

The first circulation pump 9, the second circulation pump 10, the first heat exchanger 1, the second heat exchanger 2, the third heat exchanger 3, and the fourth heat exchanger 4;

The first positive card 5, the second positive card 7;

The first reverse electricity card 6, the second reverse electricity card 8;

The first reversing valve 11 and the second reversing valve 12 .

Figure 2 shows the changes in electric field intensity on both sides of the electric card material during this cycle:

Process a is the process of applying an electric field. The voltage at both ends of the electric card material rises from 0 to E0 within 0-τ1 time. At this time, the positive electric card is an adiabatic heating process, and the reverse electric card is an adiabatic cooling process;

The b process is a heat exchange process. During the period of τ1-τ2, the voltage remains at E0, and the positive electric card is in a high temperature state. The normal temperature fluid flows through the positive electric card, absorbs the heat in the electric card material and becomes a high-temperature fluid, and the positive electric card temperature reduce. The reverse electric card is in a low temperature state, and the normal temperature fluid flows through the reverse electric card, releasing heat to the electric card material to become a low-temperature fluid, and the temperature of the reverse electric card increases;

Process c is the process of removing the electric field. The voltage at both ends of the electric card material decreases from E0 to 0 during the period of τ2-τ3. At this time, the forward electric card is an adiabatic cooling process, and the reverse electric card is an adiabatic heating process;

The d process is a heat exchange process. During the period of τ3-τ4, the voltage remains at 0, and the positive electric card is in a low temperature state. The normal temperature fluid flows through the positive electric card, releasing heat to the electric card material and becoming a low-temperature fluid, while the positive electric card temperature rises. high. The reverse current card is in a high-temperature state. The normal temperature fluid flows through the reverse current card, absorbs heat from the reverse current card and becomes a high-temperature fluid, and the temperature of the reverse current card decreases.

In the present invention, the power supply provides pulse voltage to the electrical card material to realize the heat exchange process as described above.

This circulatory system consists of two loops, the inner loop and the outer loop, and the two loops proceed in reverse directions at the same time. The outer circulation is driven by the first circulation pump 9 and passes through the first heat exchanger 1 and the fourth heat exchanger 4; the inner circulation is driven by the second circulation pump 10 and passes through the second heat exchanger 2 and the third heat exchanger 3. Each cycle consists of two parts of the process. For the convenience of description, the stage in which the electric field is applied at both ends of the electric card material is named the first half of the cycle. Corresponding to the a-b process in Figure 2, the stage in which the electric field is removed at both ends of the electric card material is named the second half of the cycle. , corresponding to the c-d process in Figure 2. Since the main application object of this system is the air conditioning system of new energy vehicles, two working modes, cooling mode and heating mode, are set up according to needs. The working processes of the two different working modes will be introduced in detail below.

In the cooling mode, the first heat exchanger 1 and the second heat exchanger 2 are used as low-temperature heat exchangers, and the third heat exchanger 3 and the fourth heat exchanger 4 are used as high-temperature heat exchangers. At this time, the outer circulation is sequential. The loop is clockwise, while the inner loop is counterclockwise.

Figure 3 is a schematic diagram of the system status in the first half of the cycle in refrigeration mode, that is, in the process of Figure 2a-b. The solid and dotted lines in the figure represent the pipe flow situation determined by the opening and closing of the control valve, where the solid line represents the direction of the valve. The pipeline is open, and the dotted line indicates that the pipeline in that direction of the valve is closed. In the process a-b, the power supply applies an electric field to the electric card material. During this process, the first positive electric card 5 and the second positive electric card 7 are both in a high temperature state, and the first reverse electric card 6 and the second reverse electric card 8 are both in a low temperature state. state. In the outer circulation, the normal temperature fluid first passes through the first reversing valve 11D, the first reversing valve 11C, the first circulation pump 9, the first reversing valve 11A, the first reversing valve 11B, the thirteenth valve 13A, and the thirteenth valve. 13B, the fourteenth valve 14C, the fourteenth valve 14A enter the first positive electric card 5, absorb the heat of the first positive electric card 5 and become a high-temperature fluid, and then pass through the seventeenth valve 17A, the seventeenth valve 17B, the eighteenth valve 18B, and the tenth The eighth valve 18A enters the high-temperature fourth heat exchanger 4, releases heat to the high-temperature fourth heat exchanger 4 and becomes a normal temperature fluid, and then enters the second fluid through the second and third valves 23A, 23B, 24B and 24C. The reverse electric card 8 releases heat to the second reverse electric card 8 and becomes a low-temperature fluid. Finally, it enters the low-temperature first heat exchanger 1 through the 27-valve 27A, the 27-valve 27B, the 28-valve 28C, and the 28-valve 28A. The first heat exchanger 1 absorbs heat and becomes a normal-temperature fluid, completing the cycle; in the inner circulation, the normal-temperature fluid first enters the second positive electric card 7 through the second-sixth valve 26A, the second-sixth valve 26B, the second-sixth valve 25C, and the second-sixth valve 25A. It absorbs the heat of the second positive electric card 7 to become a high-temperature fluid, and then enters the high-temperature third heat exchanger 3 through the second-first valve 21A, the second-first valve 21C, the second-second valve 22A, and the second-second valve 22B, and then flows to the third high-temperature heat exchanger. 3 releases heat to become a normal temperature fluid, then enters the first reverse electric card 6 through the nineteenth valve 19B, the nineteenth valve 19C, the twentieth valve 20A, and the twenty valve 20C, and releases heat to the first reverse electric card 6 to become a low-temperature fluid. Finally, Through the sixteenth valve 16C, the sixteenth valve 16A, the fifteenth valve 15B, the fifteenth valve 15A, the second reversing valve 12B, the second reversing valve 12C, the second circulation pump 10, the second reversing valve 12A, the second The reversing valve 12D enters the low-temperature second heat exchanger 2 and absorbs heat from the low-temperature second heat exchanger 2 to become a normal temperature fluid, completing the cycle.

Figure 4 is a schematic diagram of the system status in the second half of the refrigeration cycle, that is, the process in Figure 2c-d. The solid lines and dotted lines in the figure represent the pipeline circulation situation determined by the opening and closing of the control valve. The solid line represents the direction of the valve. The pipeline is open, and the dotted line indicates that the valve is closed in that direction. In process c-d, the power supply removes the electric field at both ends of the electrical card material. During this process, the first positive power card 5 and the second positive power card 7 are both in a low temperature state, and the first reverse power card 6 and the second reverse power card 8 are both in a high temperature state. In the outer circulation, the normal temperature fluid first passes through the first reversing valve 11D, the first reversing valve 11C, the first circulation pump 9, the first reversing valve 11A, the first reversing valve 11B, the thirteenth valve 13A, and the thirteenth valve. 13C, sixteen valves 16B, and sixteen valves 16C enter the first reverse electric card 6, absorb the heat of the first reverse electric card 6 and become a high-temperature fluid, and then pass through twenty valves 20C, twenty valves 20B, eighteen valves 18C, and ten The eighth valve 18A enters the high-temperature fourth heat exchanger 4, releases heat to the high-temperature fourth heat exchanger 4 and becomes a normal temperature fluid, and then enters the second fluid through the second and third valves 23A, 23C, 21B and 21A. The positive electric card 7 releases heat to the second positive electric card 7 and becomes a low-temperature fluid. Finally, it enters the low-temperature first heat exchanger 1 through the 25th valve 25A, the 25th valve 25B, the 28th valve 28B, and the 28th valve 28A. The first heat exchanger 1 absorbs heat and becomes a normal temperature fluid, completing the cycle; in the inner circulation, the normal temperature fluid first enters the second reverse electric card 8 through the 26 valve 26A, the 26 valve 26C, the 27 valve 27C, and the 27 valve 27A. It absorbs the heat of the second reverse electric card 8 to become a high-temperature fluid, and then enters the third high-temperature heat exchanger 3 through the second and fourth valves 24C, the second and fourth valves 24A, the second and second valves 22C, and the second and second valves 22B, and then flows to the third high-temperature heat exchanger. 3 releases heat to become a normal temperature fluid, and then enters the first positive electric card 5 through the nineteenth valve 19B, the nineteenth valve 19A, the seventeenth valve 17C, and the seventeenth valve 17A, and releases heat to the first positive electric card 5 to become a low-temperature fluid. Finally, Through the fourteenth valve 14A, the fourteenth valve 14B, the fifteenth valve 15C, the fifteenth valve 15A, the second reversing valve 12B, the second reversing valve 12C, the second circulation pump 10, the second reversing valve 12A, the second The reversing valve 12D enters the low-temperature second heat exchanger 2 and absorbs heat from the low-temperature second heat exchanger 2 to become a normal temperature fluid, completing the cycle.

In the heating mode, the first heat exchanger 1 and the second heat exchanger 2 are used as high-temperature heat exchangers, and the third heat exchanger 3 and the fourth heat exchanger 4 are used as low-temperature heat exchangers. At this time, the outer circulation is A counterclockwise loop, while the inner loop is a clockwise loop.

Figure 5 is a schematic diagram of the system status during the first half of the cycle in heating mode, that is, the process in Figure 2a-b. The solid and dotted lines in the figure represent the pipeline flow situation determined by the opening and closing of the control valve, where the solid line represents the valve. The pipeline in the direction is open, and the dotted line indicates that the valve is closed in that direction. In the process a-b, the power supply applies an electric field to the electric card material. During this process, the first positive electric card 5 and the second positive electric card 7 are both in a high temperature state, and the first reverse electric card 6 and the second reverse electric card 8 are both in a low temperature state. state. In the outer circulation, the normal temperature fluid first enters the second reverse electric card 8 through the 28 valve 28A, the 28 valve 28C, the 27 valve 27B, and the 27 valve 27A, releases heat to the second reverse electric card 8 and becomes a low-temperature fluid, and then passes through the second reverse electric card 8. The second and fourth valves 24C, the second and third valves 24B, the second and third valves 23B, and the second and third valves 23A enter the fourth low-temperature heat exchanger 4, absorb heat from the fourth low-temperature heat exchanger 4 and become normal temperature fluid, and then pass through the eighteenth and eighth valves 18A and 18 The eighth valve 18B, the seventeenth valve 17B, and the seventeenth valve 17A enter the first positive electric card 5, absorb heat from the first positive electric card 5 and become a high-temperature fluid, and finally pass through the fourteenth valve 14A, the fourteenth valve 14C, and the thirteenth valve 13B. , the thirteenth valve 13A, the first reversing valve 11B, the first reversing valve 11C, the first circulation pump 9, the first reversing valve 11A, the first reversing valve 11D enter the high-temperature first heat exchanger 1, and go to the high-temperature The first heat exchanger 1 releases heat to become a normal temperature fluid, completing the cycle; in the inner circulation, the normal temperature fluid first passes through the second reversing valve 12D, the second reversing valve 12C, the second circulation pump 10, the second reversing valve 12A, The second reversing valve 12B, the fifteenth valve 15A, the fifteenth valve 15B, the sixteenth valve 16A, and the sixteenth valve 16C enter the first reverse electric card 6 and release heat to the first reverse electric card 6 to become a low-temperature fluid. Ten valves 20C, twenty valves 20A, nineteen valves 19C, and nineteen valves 19B enter the third low-temperature heat exchanger 3. The third low-temperature heat exchanger 3 releases heat and becomes a normal temperature fluid, and then passes through the two-two valves 22B and 22-valve. 22A, two-one valves 21C, and two-one valves 21A enter the second positive electric card 7, absorb heat from the second positive electric card 7 and become a high-temperature fluid, and finally pass through the second-fifth valve 25A, the second-fifth valve 25C, the second-sixth valve 26B, and the second-fifth valve 26B. Six valves 26A enter the high-temperature second heat exchanger 2 and release heat to the high-temperature second heat exchanger 2 to become normal temperature fluid, completing the cycle.

Figure 6 is a schematic diagram of the system status during the second half of the cycle in heating mode, that is, the process in Figure 2c-d. The solid and dotted lines in the figure represent the pipeline circulation determined by the opening and closing of the control valve, where the solid line represents the valve The pipeline in this direction is open, and the dotted line indicates that the valve is closed in this direction. In process c-d, the power supply removes the electric field at both ends of the electrical card material. During this process, the first positive power card 5 and the second positive power card 7 are both in a low temperature state, and the first reverse power card 6 and the second reverse power card 8 are both in a high temperature state. In the outer circulation, the normal temperature fluid first enters the second positive electric card 7 through the 28th valve 28A, the 28th valve 28B, the 25th valve 25B, and the 25th valve 25A, releases heat to the second positive electric card 7 and becomes a low-temperature fluid, and then passes through the second positive electric card 7. Two-one valve 21A, two-one valve 21B, two-three valve 23C, and two-three valve 23A enter the fourth low-temperature heat exchanger 4, absorb heat from the fourth low-temperature heat exchanger 4 and become a normal temperature fluid, and then pass through the eighteen valves 18A and ten Eight valves 18C, twenty valves 20B, and twenty valves 20C enter the first reverse electric card 6, absorb heat from the first reverse electric card 6 and become high-temperature fluid, and finally pass through the sixteenth valve 16C, the sixteenth valve 16B, and the thirteenth valve 13C. , the thirteenth valve 13A, the first reversing valve 11B, the first reversing valve 11C, the first circulation pump 9, the first reversing valve 11A, the first reversing valve 11D enter the high-temperature first heat exchanger 1, and go to the high-temperature The first heat exchanger 1 releases heat to become a normal temperature fluid, completing the cycle; in the inner circulation, the normal temperature fluid first passes through the second reversing valve 12D, the second reversing valve 12C, the second circulation pump 10, the second reversing valve 12A, The second reversing valve 12B, the fifteenth valve 15A, the fifteenth valve 15C, the fourteenth valve 14B, and the fourteenth valve 14A enter the first positive electric card 5 and release heat to the first positive electric card 5 to become a low-temperature fluid. The seventh valve 17A, the seventeenth valve 17C, the nineteenth valve 19A, and the nineteenth valve 19B enter the third low-temperature heat exchanger 3, absorb heat from the third low-temperature heat exchanger 3 and become a normal temperature fluid, and then pass through the second and second valves 22B and 22 Valve 22C, 24 valve 24A, 24 valve 24C enter the second reverse electric card 8, absorb heat from the second reverse electric card 8 and become a high temperature fluid, and finally pass through the 27 valve 27A, the 27 valve 27C, the 26 valve 26C, The two-sixth valve 26A enters the high-temperature second heat exchanger 2 and releases heat to the high-temperature second heat exchanger 2 to become a normal temperature fluid, completing the cycle.

The above specific description further explains the purpose, technical solution and beneficial effects of the invention in detail. The invention only specifically explains the application working form of the system in the vehicle thermal management system, especially the electric vehicle thermal management system. In addition, it can also be applied to other work scenarios. Therefore, it should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention can be etc., should all be included in the protection scope of the present invention.

Claims (3)

1. A control method of a vehicle thermal management system based on a forward and reverse electric card comprises an outer side circulation pipeline and an inner side circulation pipeline;

the outside circulation pipeline sequentially comprises a first circulation pump (9), a first heat exchanger (1), a second electric clamping pipeline, a fourth heat exchanger (4) and a first electric clamping pipeline, and a closed circulation pipeline is formed by pipelines;

the inner side circulation pipeline sequentially comprises a second circulation pump (10), a second heat exchanger (2), a second electric clamping pipeline, a third heat exchanger (3) and a first electric clamping pipeline, and a closed circulation pipeline is formed by pipelines;

the first positive electricity card (5) and the first inverse electricity card (6) are connected in parallel to form a first electricity card pipeline through a control valve;

the second positive electricity card (7) and the second inverse electricity card (8) are connected in parallel to form a second electricity card pipeline through a control valve;

the first electric clamp pipeline and the second electric clamp pipeline are respectively connected in series with the inner side circulating pipeline and the outer side circulating pipeline through control valves;

the first circulating pump (9) is connected with the first reversing valve (11) in parallel;

the second circulating pump (10) is connected with the second reversing valve (12) in parallel;

the method is characterized by comprising the following steps:

providing pulse voltage for the electric card material through a power supply to realize a heat exchange process;

the device comprises an outer circulation and an inner circulation, wherein the two circulation are simultaneously and reversely carried out;

the outside circulation is driven by a first circulating pump (9) and passes through the first heat exchanger (1) and the fourth heat exchanger (4); the inner circulation is driven by a second circulation pump (10) and passes through a second heat exchanger (2) and a third heat exchanger (3);

each cycle consists of two parts of processes, namely a stage of applying an electric field at two ends of the electric card material is named as a first half of the cycle, and a stage of removing the electric field at two ends of the electric card material is named as a second half of the cycle;

the refrigerating and heating system comprises two working modes, namely a refrigerating mode and a heating mode.

2. The control method of a vehicle thermal management system based on a forward and reverse electric card according to claim 1, wherein in the cooling mode:

the first heat exchanger (1) and the second heat exchanger (2) are used as low-temperature heat exchangers, the third heat exchanger (3) and the fourth heat exchanger (4) are used as high-temperature heat exchangers, at the moment, the outer circulation is clockwise circulation, and the inner circulation is anticlockwise circulation;

in the first half of the circulation process in the refrigeration mode, the power supply applies an electric field to the electric card material, in the process, the first positive electric card (5) and the second positive electric card (7) are both in a high-temperature state, and the first inverse electric card (6) and the second inverse electric card (8) are both in a low-temperature state;

in the outside circulation, normal temperature fluid firstly enters a first positive electricity card (5) through a first circulating pump (9), absorbs heat of the first positive electricity card (5) to become high temperature fluid, then enters a high Wen Disi heat exchanger (4), gives off heat to a high temperature fourth heat exchanger (4) to become normal temperature fluid, then enters a second inverse electricity card (8), gives off heat to a second inverse electricity card (8) to become low temperature fluid, finally enters a low temperature first heat exchanger (1), and absorbs heat from the low temperature first heat exchanger (1) to become normal temperature fluid, so that the circulation is completed;

in the inner circulation, normal temperature fluid firstly enters a second positive electricity card (7), absorbs heat of the second positive electricity card (7) to become high temperature fluid, then enters a high Wen Disan heat exchanger (3), gives out heat to a high temperature third heat exchanger (3) to become normal temperature fluid, then enters a first inverse electricity card (6), gives out heat to the first inverse electricity card (6) to become low temperature fluid, finally enters a low temperature second heat exchanger (2) through a second circulating pump (10), and absorbs heat from the low temperature second heat exchanger (2) to become normal temperature fluid, so that the circulation is completed;

in the latter half of refrigeration cycle in the refrigeration mode, the power supply removes the electric field at two ends of the electric card material, in the process, the first positive electric card (5) and the second positive electric card (7) are in a low-temperature state, and the first inverse electric card (6) and the second inverse electric card (8) are in a high-temperature state;

in the outside circulation, normal temperature fluid firstly enters a first reverse electric card (6) through a first circulating pump (9), absorbs heat of the first reverse electric card (6) to become high temperature fluid, then enters a high Wen Disi heat exchanger (4), gives off heat to a high temperature fourth heat exchanger (4) to become normal temperature fluid, then enters a second positive electric card (7), gives off heat to the second positive electric card (7) to become low temperature fluid, finally enters a low temperature first heat exchanger (1), and absorbs heat from the low temperature first heat exchanger (1) to become normal temperature fluid, so that the circulation is completed;

in the inner circulation, normal temperature fluid firstly enters a second reverse electric card (8), absorbs heat of the second reverse electric card (8) to become high temperature fluid, then enters a high Wen Disan heat exchanger (3), gives out heat to a high temperature third heat exchanger (3) to become normal temperature fluid, then enters a first positive electric card (5), gives out heat to the first positive electric card (5) to become low temperature fluid, finally enters a low temperature second heat exchanger (2) through a second circulating pump (10), and absorbs heat from the low temperature second heat exchanger (2) to become normal temperature fluid, so that the circulation is completed.

3. The control method of a vehicle thermal management system based on a forward and reverse electric card according to claim 1, wherein in the heating mode:

the first heat exchanger (1) and the second heat exchanger (2) are used as high-temperature heat exchangers, the third heat exchanger (3) and the fourth heat exchanger (4) are used as low-temperature heat exchangers, and at the moment, the outer circulation is anticlockwise circulation, and the inner circulation is clockwise circulation;

in the first half of the heating mode lower circulation process, an electric field is applied to the electric card material by a power supply, in the process, the first positive electric card (5) and the second positive electric card (7) are both in a high-temperature state, and the first inverse electric card (6) and the second inverse electric card (8) are both in a low-temperature state;

in the outside circulation, normal temperature fluid firstly enters a second reverse electric card (8), heat is released to the second reverse electric card (8) to become low temperature fluid, then enters a low temperature fourth heat exchanger (4), heat is absorbed from the low Wen Disi heat exchanger (4) to become normal temperature fluid, then enters a first positive electric card (5), heat is absorbed from the first positive electric card (5) to become high temperature fluid, finally enters a high temperature first heat exchanger (1) through a first circulating pump (9), and heat is released to the high temperature first heat exchanger (1) to become normal temperature fluid, so that the circulation is completed;

in the inner circulation, normal temperature fluid enters a first reverse electric card (6) through a second circulating pump (10), heat is released to the first reverse electric card (6) to become low temperature fluid, then enters a low Wen Disan heat exchanger (3), heat is absorbed from the low Wen Disan heat exchanger (3) to become normal temperature fluid, then enters a second positive electric card (7), heat is absorbed from the second positive electric card (7) to become high temperature fluid, finally enters a high temperature second heat exchanger (2), and heat is released to the high temperature second heat exchanger (2) to become normal temperature fluid, so that the circulation is completed;

in the latter half of the heating mode lower circulation, the power supply removes the electric fields at the two ends of the electric card material; in the process, the first positive electricity card (5) and the second positive electricity card (7) are in a low-temperature state, and the first reverse electricity card (6) and the second reverse electricity card (8) are in a high-temperature state;

in the outside circulation, normal temperature fluid firstly enters a second positive electric card (7), emits heat to the second positive electric card (7) to become low temperature fluid, then enters a low temperature fourth heat exchanger (4), absorbs heat from the low Wen Disi heat exchanger (4) to become normal temperature fluid, then enters a first inverse electric card (6), absorbs heat from the first inverse electric card (6) to become high temperature fluid, finally enters a high temperature first heat exchanger (1) through a first circulating pump (9), emits heat to the high temperature first heat exchanger (1) to become normal temperature fluid, and the circulation is completed;

in the inner circulation, normal temperature fluid enters the first positive electricity card (5) through the second circulating pump (10), heat is released to the first positive electricity card (5) to become low temperature fluid, then enters the low Wen Disan heat exchanger (3), heat is absorbed from the low Wen Disan heat exchanger (3) to become normal temperature fluid, then enters the second inverse electricity card (8), heat is absorbed from the second inverse electricity card (8) to become high temperature fluid, finally enters the high temperature second heat exchanger (2), and heat is released to the high temperature second heat exchanger (2) to become normal temperature fluid, so that the circulation is completed.