CN110398043B

CN110398043B - Thermal management system and control method thereof

Info

Publication number: CN110398043B
Application number: CN201810378323.2A
Authority: CN
Inventors: 不公告发明人
Original assignee: Sanhua Holding Group Co Ltd
Current assignee: Sanhua Holding Group Co Ltd
Priority date: 2018-04-25
Filing date: 2018-04-25
Publication date: 2022-06-14
Anticipated expiration: 2038-04-25
Also published as: CN110398043A

Abstract

The invention discloses a heat management system and a control method thereof, wherein the heat management system comprises a first evaporator and a second evaporator, a pressure regulating valve is arranged between an outlet of the first evaporator and an inlet of a compressor, and the heat management system can regulate the opening of the pressure regulating valve according to the relation between the current pressure of the outlet of the first evaporator and the target pressure of the outlet of the first evaporator.

Description

Thermal management system and control method thereof

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of thermal management.

[ background ] A method for producing a semiconductor device

As technology develops, thermal management systems may be provided with two evaporators to handle different refrigeration needs. Generally, the branches where the two evaporators are located are arranged in parallel, and the outlets of the evaporators of the thermal management system are communicated with the inlet of the compressor, so that the pressures of the outlets of the evaporators of the thermal management system are approximately the same, and if the internal pressure loss of the evaporators is neglected, the evaporation pressures of the different evaporators are approximately the same, so that the evaporation temperatures of the evaporators are difficult to adjust according to refrigeration requirements, and the difficulty in adjusting the refrigeration capacity of the thermal management system is increased.

[ summary of the invention ]

The invention aims to provide a heat management system and a control method thereof, which are beneficial to improving the refrigerating regulation capacity of the heat management system.

A heat management system comprises a compressor, and further comprises a first branch and a second branch, wherein the first branch and the second branch are arranged in parallel, the first branch comprises a first evaporator and a pressure regulating valve, the pressure regulating valve is arranged between an outlet of the first evaporator and an inlet of the compressor, and the outlet of the first evaporator can be communicated with the inlet of the compressor through the pressure regulating valve; the second branch comprises a second evaporator, an outlet of the second evaporator can be communicated with an inlet of the compressor, and an outlet of the compressor can be communicated with an inlet of the first evaporator and/or an inlet of the second evaporator; the heat management system also comprises an air conditioner controller, the air conditioner controller is in signal connection with the compressor and the pressure regulating valve, the air conditioner controller can adjust the rotating speed of the compressor, and the air conditioner controller can adjust the opening degree of the pressure regulating valve;

the air conditioner controller acquires the current temperature of the first evaporator and the current pressure of the outlet of the first evaporator; when the air conditioner controller judges that the current temperature of the first evaporator is higher than the target temperature of the first evaporator, the target pressure of the outlet of the first evaporator is obtained; and adjusting the opening degree of the pressure regulating valve according to the relation between the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet.

A control method of a thermal management system is applied to the thermal management system, the thermal management system comprises a compressor, the thermal management system further comprises a first branch and a second branch, the first branch and the second branch are arranged in parallel, the first branch comprises a first evaporator and a pressure regulating valve, the pressure regulating valve is arranged between an outlet of the first evaporator and an inlet of the compressor, and an outlet of the first evaporator can be communicated with the inlet of the compressor through the pressure regulating valve; the second branch comprises a second evaporator, an outlet of the second evaporator can be communicated with an inlet of the compressor, and an outlet of the compressor can be communicated with an inlet of the first evaporator and/or an inlet of the second evaporator; the heat management system also comprises an air conditioner controller, the air conditioner controller is in signal connection with the compressor and the pressure regulating valve, the air conditioner controller can output and regulate the rotating speed of the compressor, and the air conditioner controller can regulate the opening degree of the pressure regulating valve;

The heat management system comprises a first branch and a second branch which are arranged in parallel, the first branch comprises a first evaporator and a pressure regulating valve, the second branch comprises a second evaporator, the pressure regulating valve is arranged between an outlet of the first evaporator and an inlet of the compressor, when the current temperature of the first evaporator is different from the target temperature of the first evaporator, the target pressure of the outlet of the first evaporator is set, the air-conditioning controller can adjust the opening of the pressure regulating valve according to the relation between the current pressure of the outlet of the first evaporator and the target pressure of the outlet of the first evaporator so as to control the pressure of the outlet of the first evaporator, the evaporation temperature of the first evaporator can be adjusted, and the heat management system can relatively and independently adjust the evaporation temperature of the first evaporator, so that the refrigerating adjusting capacity of the heat management system is relatively improved.

[ description of the drawings ]

FIG. 1 is a schematic diagram of a thermal management system according to one aspect of the present invention;

FIG. 2 is a schematic view of a thermal management system according to another aspect of the present invention;

FIG. 3 is a control flow diagram of the thermal management system according to the first embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating the opening adjustment of the pressure regulating valve of FIG. 3;

FIG. 5 is a schematic control flow diagram of the thermal management system during a first object cooling demand;

FIG. 6 is a schematic control flow diagram of the thermal management system during a cooling demand at the first object;

fig. 7 is a control flow diagram of the thermal management system when both the first object and the second object have cooling requirements;

FIG. 8 is a schematic diagram illustrating a positional relationship between the target section, the first section and the second section;

FIG. 9 is a control flow diagram of a thermal management system according to a second embodiment of the present invention;

FIG. 10 is a schematic control flow diagram for the first adjustment mode of FIG. 9;

fig. 11 is a schematic view of a second adjustment mode control routine of fig. 9.

[ detailed description ] embodiments

The thermal management system according to the technical scheme of the invention can be applied to various embodiments, and can be applied to a vehicle thermal management system, wherein part or all of the embodiments can also be applied to a household thermal management system or a commercial thermal management system, and the following description is given by taking the vehicle thermal management system as an example and combining with the accompanying drawings.

The embodiment of the invention also provides a control method of the thermal management system, which can be applied to the thermal management system and can be used for controlling the thermal management system. Referring to fig. 1 and fig. 2, a thermal management system includes a compressor 10, a condenser 20, a first valve 11, a first branch and a second branch, where the first valve 11 includes a first port 111, a second port 112 and a third port 113, the first valve 11 can open or close or adjust a communication channel between the first port of the first valve 11 and the third port of the first valve 11, and/or the first valve 11 can open or close or adjust a communication channel between the first port of the first valve and the second port of the first valve; the outlet of the compressor is communicated with the first port of the condenser, and the second port of the condenser is communicated with the first port 111 of the first valve element; the first branch is arranged in parallel with the second branch, the first branch comprises a first throttling element 12, a first evaporator 30 and a pressure regulating valve 13, the first throttling element 12, the first evaporator 30 and the pressure regulating valve 13 are communicated in series, specifically, the second interface 112 of the first valve can be communicated with the inlet of the first evaporator 30, wherein the first throttling element 12 is arranged between the second interface of the first valve and the inlet of the first evaporator, the first throttling element 12 can be a throttling element such as a thermal expansion valve, an electronic expansion valve or a capillary tube, and the first throttling element is used for throttling and depressurizing a refrigerant entering the first evaporator; the pressure regulating valve 13 is disposed between an outlet of the first evaporator and an inlet of the compressor, the outlet of the first evaporator can be communicated with the inlet of the compressor, and the pressure regulating valve 13 is used for regulating the pressure of the refrigerant at the outlet of the first evaporator. A pressure sensor 222 is further disposed between the pressure regulating valve 13 and the outlet of the first evaporator, and the pressure sensor 222 is configured to detect a refrigerant pressure at the outlet of the first evaporator. The heat management system is further provided with a first temperature sensor 221, specifically, when only a refrigerant flows through the first evaporator, the refrigerant in the first evaporator exchanges heat with the airflow, and along the airflow direction, the first temperature sensor is arranged between the first evaporator and the cooled object to reflect the temperature of the airflow after being cooled by the refrigerant, or the temperature detected by the first temperature sensor is used for reflecting the temperature level of the airflow after absorbing the cold energy; if the first evaporator is a double-channel heat exchanger, the first evaporator comprises a refrigerant channel and a cooling liquid channel, and the first temperature sensor is arranged at the outlet of the cooling liquid channel and used for reflecting the temperature level of the cooling liquid after the cooling capacity is absorbed; or the first evaporator is a direct cooling plate, and the temperature sensor 221 is disposed in the direct cooling plate and is configured to reflect the temperature of the refrigerant after releasing the cooling capacity, where a cooling object of the first evaporator is defined as a first object. The second branch comprises a second throttling element 14 and a second evaporator 40, the second throttling element 14 and the second evaporator 40 are communicated in series, and specifically, the third port of the first valve member 11 is communicated with the inlet of the second evaporator 40 through the second throttling element 14. Specifically, the second throttling element 14 is disposed between the third interface of the first valve element 11 and an inlet of the second evaporator, the second throttling element 14 may be a thermostatic expansion valve, an electronic expansion valve, or a capillary tube, and the second throttling element is used for throttling and depressurizing the refrigerant entering the second evaporator; the outlet of the second evaporator is communicated with the inlet of the compressor; in addition, the thermal management system is further provided with a second temperature sensor 223, wherein only a refrigerant circulates in the second evaporator, the refrigerant in the second evaporator exchanges heat with the airflow, and the second temperature sensor is arranged between the second evaporator and a cooling object of the second evaporator along the airflow direction to reflect the temperature of the cooled airflow, or the temperature monitored by the second temperature sensor is used for reflecting the temperature level of the airflow after absorbing the cooling capacity, wherein the cooling object of the second evaporator is defined as a second object. In addition, the second branch may also be provided with a pressure regulating valve (not shown), the pressure regulating valve of the second branch is disposed between the outlet of the second evaporator and the inlet of the compressor, the outlet of the second evaporator can be communicated with the inlet of the compressor, and the pressure regulating valve of the second branch is used for regulating the pressure of the refrigerant at the outlet of the second evaporator. It can be known that the first valve member may be a three-way valve or a three-way flow regulating valve, please refer to fig. 1; the first valve member may also be a combination of a shut-off valve 1101 and a shut-off valve 1102 or two flow regulating valves, see fig. 2. In the technical scheme of the invention, the communication mode comprises direct communication and indirect communication, and specifically, the indirect communication means that the interfaces of two devices or the interfaces of two components can be communicated through another device or component.

The thermal management system further comprises an air conditioner controller 100, wherein the air conditioner controller 100 comprises a control circuit, the control circuit at least comprises a communication unit, a processing unit and a storage unit, and the storage unit is in signal connection with the communication unit and/or the processing unit and is used for storing relevant parameters input by the communication unit and/or the processing unit; the processing unit is in signal connection with the storage unit and the communication unit and is used for processing input information of the storage unit and/or communication, and the communication unit is used for receiving and sending information. The air conditioner controller 100 is in signal connection with the first temperature sensor 221, the second temperature sensor 223 and the pressure sensor 222, and the air conditioner controller 100 can receive a detection signal of the pressure sensor 222 and can analyze the pressure of the pressure sensor to obtain the pressure of a detection position of the pressure sensor; the air conditioner controller 100 can receive the detection signals of the first temperature sensor and the second temperature sensor, and can analyze the temperature of the corresponding sensors to obtain the temperature of the detection positions of the first temperature sensor and the second temperature sensor. The air conditioner controller 100 can also receive information input outside the thermal management system, for example, the air conditioner controller is in signal connection with other devices, the air conditioner controller can receive and process signals of other devices, and the other devices include a vehicle control unit and the like; the air conditioner controller may also include a human-machine interface through which a user inputs a corresponding command, such as turning on a compressor, setting a temperature, etc. The air conditioner controller is in signal connection with the compressor to control starting, closing, rotating speed adjustment and the like of the compressor, wherein the air conditioner controller can comprise a first driving unit, the air conditioner controller drives the compressor through the first driving unit, the first driving unit can also be arranged on the compressor, the air conditioner controller outputs signals to the first driving unit of the compressor, and the first driving unit drives a rotor of the compressor to rotate. The air conditioner controller is in signal connection with the pressure regulating valve 13, and the air conditioner controller can send an instruction to the pressure regulating valve to open or close the pressure regulating valve 13, or adjust the opening degree of the pressure regulating valve, and the like, wherein the air conditioner controller may include a second driving unit, the air conditioner controller drives the pressure regulating valve through the second driving unit, the second driving unit may also be arranged on the pressure regulating valve 13, the air conditioner controller outputs a signal to the second driving unit, and the second driving unit drives the pressure regulating valve to operate.

The control method of the thermal management system can be applied to the thermal management system, and the control method of the thermal management system is described below by taking a vehicle thermal management system as an example, wherein the thermal management system comprises a first evaporator, and when the thermal management system works, the first evaporator can release cold energy to cool heating equipment such as a battery and the like so that the heating equipment such as the battery and the like work in a normal temperature range; the heat management system comprises a second evaporator, the second evaporator is arranged in an air-conditioning box of the vehicle, and when the heat management system works, the second evaporator can provide cooling capacity for the passenger compartment and is used for adjusting the temperature in the passenger compartment; in the technical scheme of the invention, the heat-generating equipment such as a battery refers to equipment which can generate a large amount of heat in a vehicle and needs to be cooled to meet normal operation, such as a power battery, a motor, electronic equipment and the like. It will be appreciated by those skilled in the art that the control method of the thermal management system of the present invention may be applied to any thermal management system that is the same as or similar to that shown in fig. 1 or fig. 2.

Referring to fig. 3 to 7, in a first embodiment of the method for controlling a thermal management system, the method for controlling a thermal management system includes:

s1, the air conditioner controller acquires the current temperature of the first evaporator and acquires the current pressure of the outlet of the first evaporator; the current temperature of the first evaporator is detected by a first temperature sensor, and the current pressure at the outlet of the first evaporator is detected by a pressure sensor. The air conditioner controller receives a signal of the first temperature sensor, analyzes the current temperature of the first evaporator, acquires the current temperature of the first evaporator, and stores the current temperature in the storage unit or directly transmits the current temperature to the processing unit; the air conditioner controller receives the signal of the pressure sensor and analyzes the current pressure of the outlet of the first evaporator, and the current pressure of the outlet of the first evaporator is acquired and then stored in the storage unit or directly transmitted to the processing unit.

And S2, judging the relation between the current temperature of the first evaporator and the target temperature of the first evaporator, and acquiring the target pressure at the outlet of the first evaporator when the current temperature of the first evaporator is judged to be greater than the target temperature of the first evaporator.

The target temperature of the first evaporator may be stored in the air conditioner controller, or may be input from the outside, for example, input by a user through a human-computer interface, and the target temperature of the first evaporator may be a temperature value T1s, such as 25 ℃, or a temperature interval [ T1s1, T1s2], such as [20 ℃, 30 ℃ ], or such as [ T1s-1, T1s +1 ]. The target pressure at the outlet of the first evaporator may be a pressure value Ps, such as 0.3MPa, or a pressure range [ Ps1, Ps2], such as [0.3MPa, 0.5MPa ], or such as [ Ps1-0.1, Ps1+0.1 ]. The target pressure of the first evaporator may be stored in the air conditioner controller in advance, or may be calculated in other manners and stored in the air conditioner controller.

The air conditioner controller judges the relationship between the current temperature of the first evaporator and the target temperature of the first evaporator after acquiring the target temperature of the first evaporator, whether the air conditioner controller acquires the target pressure of the outlet of the first evaporator according to the judgment result of the current temperature of the first evaporator and the target temperature of the first evaporator or not, when the current temperature of the first evaporator is higher than the target temperature of the first evaporator, the air conditioner controller acquires the target pressure of the first evaporator, and when the current temperature of the first evaporator is equal to the target temperature of the first evaporator, the air conditioner controller keeps the opening degree of the pressure regulating valve and the rotating speed of the compressor unchanged.

In other embodiments, in step S2, the air conditioner controller may also set the rotation speed of the compressor at the same time, that is: the target pressure of the outlet of the first evaporator and the rotating speed of the compressor are set according to the relation between the current temperature of the first evaporator and the target temperature of the first evaporator, and the rotating speed of the compressor is set according to the relation between the current temperature of the first evaporator and the target temperature of the first evaporator, so that energy is saved, and the rotating speed of the compressor is convenient to adjust.

The first evaporator is used for reducing the temperature of heat-generating equipment such as batteries and the like so as to ensure that the heat-generating equipment such as the batteries and the like can work in a reasonable range. Defining a first temperature interval, a second temperature interval and a third temperature interval, wherein the third temperature interval is a reasonable working interval of the heat generating equipment such as a battery or is smaller than the temperature in the reasonable working interval of the heat generating equipment such as the battery, or the third temperature interval is smaller than or equal to the target temperature of the first evaporator, any temperature contained in the first temperature interval is larger than any temperature contained in the second temperature interval and is also larger than any temperature contained in the third temperature interval, any temperature contained in the second temperature interval is larger than any temperature contained in the third temperature interval, wherein the first temperature interval, the second temperature interval and the third temperature interval are all in a reasonable temperature range which can be kept by the thermal management system, the first temperature interval, the second temperature interval and the third temperature interval have no intersection, and the aggregate of the first temperature interval, the second temperature interval and the third temperature interval is a continuous interval, the collection of the first temperature interval, the second temperature interval, and the third temperature interval is a reasonable temperature range within which the thermal management system can be located. The relationship of the current temperature of the first evaporator to the target temperature of the first evaporator includes: the current temperature of the first evaporator is equal to the target temperature of the first evaporator, or the current temperature of the first evaporator is different from the target temperature of the first evaporator. Specifically, the current temperature of the first evaporator is equal to the target temperature of the first evaporator, or the current temperature of the first evaporator may be in a third temperature interval; the current temperature of the first evaporator is greater than the target temperature of the first evaporator, or the current temperature of the first evaporator does not fall within the third temperature interval. Wherein the current temperature of the first evaporator being greater than the target temperature of the first evaporator specifically comprises: the current temperature of the first evaporator is in a first temperature interval, or the current temperature of the first evaporator is in a second temperature interval. It is understood that the first temperature range, the second temperature range and the third temperature range may be a larger range, such as a range of 10 ℃, or a very small range, such as a range of 0.001 ℃.

In step S2, when the current temperature of the first evaporator is greater than the target temperature of the first evaporator, it is determined whether the current temperature of the first evaporator is within a first temperature range, and if the current temperature of the first evaporator is within the first temperature range, a first target pressure at the outlet of the first evaporator is obtained, and when the current temperature of the first evaporator is within a second temperature range, a second target pressure at the outlet of the first evaporator is obtained. And if the current temperature of the first evaporator is in the third temperature interval, keeping the rotating speed of the compressor and the opening of the pressure regulating valve unchanged. In general, since the difference between the first temperature interval and the third temperature interval is greater than the difference between the second temperature interval and the third temperature interval, the first target pressure is less than the second target pressure, and will not be described in detail.

In other embodiments, in step S2, the controller may also set the rotation speed of the compressor at the same time, that is: the method comprises the steps of setting a first rotating speed of a compressor when the current temperature of a first evaporator is in a first temperature interval, setting a second rotating speed of the compressor when the current temperature of the first evaporator is in a second temperature interval, and setting the first rotating speed of the compressor to be greater than the second rotating speed of the compressor because the difference value between the first temperature interval and the third temperature interval is greater than the difference value between the second temperature interval and the third temperature interval. And if the current temperature of the first evaporator is in the third temperature interval, keeping the rotating speed of the compressor unchanged.

And S3, adjusting the opening degree of the pressure regulating valve according to the relation between the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet. The air conditioner controller obtains a target pressure of the outlet of the first evaporator, judges the relation between the current pressure of the outlet of the first evaporator and the target pressure of the outlet of the first evaporator, and adjusts the opening degree of the pressure regulating valve according to the judgment result of the current pressure of the outlet of the first evaporator and the target pressure of the outlet of the first evaporator.

Step S3 specifically includes:

and S31, judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator. According to step S2, when the current temperature of the first evaporator is in the first temperature range, the relationship between the current pressure at the outlet of the first evaporator and the first target pressure is determined, and when the current temperature of the first evaporator is in the second temperature range, the relationship between the current pressure at the outlet of the first evaporator and the second target pressure is determined. In one embodiment of the present invention, when the current temperature of the first evaporator is in the first temperature interval, the target pressure of the first evaporator is the first target pressure, and when the current temperature of the first evaporator is in the second temperature interval, the target pressure of the first evaporator is the second target pressure; in determining the relationship between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator, the difference between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator is in the range of [ -. DELTA.P 1 MPa,. DELTA.P 2 MPa ], i.e., they can be considered equal, the difference between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator is less than-ap Mpa, namely, the current pressure at the outlet of the first evaporator is considered to be smaller than the target pressure at the outlet of the first evaporator, the difference between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator is larger than deltaP Mpa, that is, the current pressure at the outlet of the first evaporator is considered to be greater than the target pressure at the outlet of the first evaporator, and of course Δ P1 and Δ P2 may or may not be 0, and Δ P1 and Δ P2 may or may not be equal. The relationship of the current pressure at the first evaporator outlet to the target pressure at the first evaporator outlet comprises: the current pressure at the outlet of the first evaporator is less than the target pressure at the outlet of the first evaporator, the current pressure at the outlet of the first evaporator is equal to the target pressure at the outlet of the first evaporator, and the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator.

And S32, adjusting the opening degree of the pressure regulating valve according to the comparison result of the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet. Specifically, when the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, the opening degree of the pressure regulating valve is reduced; when the current pressure at the outlet of the first evaporator is higher than the target pressure at the outlet of the first evaporator, the opening degree of the pressure regulating valve is increased; when the current pressure of the outlet of the first evaporator is in the range of the target pressure of the outlet of the first evaporator or equal to the target pressure value of the outlet of the first evaporator, the opening degree of the pressure regulating valve is kept unchanged.

In another embodiment, the controlling of the thermal management system further includes step S0, specifically, step S0 includes step S01, and step S01 includes: and acquiring the refrigeration requirement of the heat management system, and adjusting the first valve according to the refrigeration requirement of the heat management system. Specifically, the refrigeration requirements of the thermal management system include that the first object has refrigeration requirements and/or the second object has refrigeration requirements, that is, the first object has refrigeration requirements, or the second object has refrigeration requirements, or both the first object and the second object have refrigeration requirements. In the technical scheme of the invention, the first evaporator is used for cooling the first object, the first object can be a heating device such as a battery, and the first evaporator can adjust the temperature of the heating device such as the battery in a direct cooling mode; or the first evaporator can also be a double-channel heat exchanger, two different fluids such as a refrigerant and cooling liquid flow in the double-channel heat exchanger, the refrigerant and the cooling liquid can exchange heat in the first evaporator, and the cooling liquid is absorbed to absorb cooling capacity from the refrigerant and then cool the heating equipment such as a battery. The second evaporator is used for cooling a second object, which may be a passenger compartment, to adjust the temperature of the passenger compartment to meet the comfort of passengers. If the first object has a refrigeration requirement, the heat management system opens a communication channel between a first interface of the first valve and a second interface of the first valve, and after being discharged from the condenser, the refrigerant flows into the first throttling element from the second interface; if the second object has a refrigeration requirement, the heat management system opens a communication channel between the first interface and the third interface, and after being discharged from the condenser, the refrigerant flows into the second evaporator from the third interface; if the first object and the second object have refrigeration requirements, the thermal management system opens a communication channel between the first interface and the second interface, the thermal management system opens a communication channel between the first interface and the third interface, and a refrigerant flows into the first throttling element and the second throttling element after being discharged from the condenser and then respectively enters the first evaporator and the second evaporator. The refrigeration requirement of the heat management system can be calculated according to the air conditioner controller, can also be sent to the air conditioner controller by other equipment, and can also be input by a user through a human-computer interaction interface.

Before the step S1 "acquiring the current temperature of the first evaporator, acquiring the current pressure at the outlet of the first evaporator", the step S0 further includes the step S02: and opening the pressure regulating valve. The opening of the pressure regulating valve is 0-100%, wherein 0 is closed, and 100% is fully opened. Specifically, if the first object has a refrigeration demand, the pressure regulating valve is opened or the opening state of the pressure regulating valve is maintained, wherein the "opening" or "opening state" is not closed, and otherwise, the pressure regulating valve is closed or the closing state of the pressure regulating valve is maintained; in the technical scheme of the invention, the first throttling element and the second throttling element can be thermal expansion valves or throttling pipes, and at this time, the adjustment is not needed before the compressor is started, and if the first throttling element and/or the second throttling element are electronic expansion valves, the first throttling element and/or the second throttling element are/is started before the compressor is started, so that the electronic expansion valves or the compressor is prevented from being damaged.

Before the step S1 "acquiring the current temperature of the first evaporator, acquiring the current pressure at the outlet of the first evaporator", the step S0 further includes the step S03: the compressor is turned on. Otherwise, in step S1, the pressure at the outlet of the first evaporator is acquired meaningless.

When the air conditioner controller obtains that only the first object has a refrigeration demand, the first valve element opens the communication channel between the first interface and the second interface, closes the channel between the first interface and the third interface, and opens the compressor and the pressure regulating valve.

When the first object has a cooling demand, the thermal management system control may further include, in place of step S32, step S32':

s32', adjusting the opening of the pressure regulating valve and adjusting the speed of the compressor according to the relationship between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator.

And if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, judging whether the rotating speed of the compressor is the lowest rotating speed or not, if so, reducing the opening degree of the pressure regulating valve, otherwise, reducing the rotating speed of the compressor, keeping the opening degree of the pressure regulating valve unchanged or further reducing the opening degree of the pressure regulating valve. And if the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, judging whether the rotating speed of the compressor is the maximum rotating speed or not, if so, increasing the opening degree of the pressure regulating valve, and if not, reducing the opening degree of the pressure regulating valve.

The controlling of the thermal management system also includes controlling the first throttling element when the first object has a refrigeration demand, and will not be described in detail herein. When the first object has a refrigeration requirement, the pressure at the outlet of the first evaporator is adjusted through the pressure adjusting valve at the outlet of the first evaporator, so that the evaporation temperature of the first evaporator is adjusted, the evaporation temperature of the first evaporator is adjusted only by the first throttling element, the refrigeration adjusting capacity of the first evaporator is enhanced, and the refrigeration adjusting capacity of the thermal management system is enhanced.

In step S0, if the air conditioner controller obtains that the first object and the second object both have cooling requirements, the first valve opens the communication channel between the first interface and the second interface, and the compressor and the pressure regulating valve are turned on. The control flow of the thermal management system when the first object and the second object have cooling requirements will be described in detail as follows.

Step S1 includes: and acquiring the current temperature of the first evaporator and the current temperature of the second evaporator, and acquiring the current pressure of the outlet of the first evaporator.

Step S2 specifically includes:

s20, acquiring the target temperature of the second evaporator, and judging the relation between the current temperature of the second evaporator and the target temperature of the second evaporator; in the technical scheme of the invention, the second evaporator is used for reducing the temperature of the passenger compartment so as to ensure the comfort of passengers. The result of comparing the current temperature of the second evaporator with the target temperature of the second evaporator includes: the current temperature of the second evaporator is equal to the target temperature range of the second evaporator, at this time, the passenger has better experience, the current temperature of the second evaporator is less than the target temperature of the second evaporator, at this time, the passenger has cooler experience, the current temperature of the second evaporator is greater than the target temperature of the second evaporator, and at this time, the passenger has hotter experience. The target temperature of the second evaporator may be stored in the air conditioner controller, or may be input from the outside, for example, input by a user through a human-computer interface, and the second target temperature may be a value T2s, for example, 15 ℃, or a temperature range [ T2s1, T2s2], for example, [10 ℃, 20 ℃ ].

And S21, setting a first target pressure at the outlet of the first evaporator when the current temperature of the first evaporator is in a first temperature interval, defining a second target pressure at the outlet of the first evaporator when the current temperature of the first evaporator is in a second temperature interval, and keeping the rotating speed of the compressor and the opening of the pressure regulating valve unchanged when the current temperature of the first evaporator is in a third temperature interval.

After acquiring the current pressure at the outlet of the first evaporator, step S3 specifically includes:

and S31, judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator.

According to step S2, when the current temperature of the first evaporator is in the first temperature range, the relationship between the current pressure at the outlet of the first evaporator and the first target pressure is determined, and the determination result includes: the current pressure at the first evaporator outlet is less than the first target pressure, or the current pressure at the first evaporator outlet is equal to the first target pressure, or the current pressure at the first evaporator outlet is greater than the first target pressure. Similarly, when the current temperature of the first evaporator is in the second temperature interval, the relationship between the current pressure at the outlet of the first evaporator and the second target pressure is judged, and the judgment result comprises: the current pressure at the outlet of the first evaporator is less than the second target pressure, the current pressure at the outlet of the first evaporator is equal to the second target pressure, and the current pressure at the outlet of the first evaporator is greater than the second target pressure.

And S32, adjusting the opening degree of the pressure regulating valve according to the relation between the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet. Specifically, if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, the opening degree of the pressure regulating valve is reduced; when the current pressure at the outlet of the first evaporator is higher than the target pressure at the outlet of the first evaporator, increasing the opening of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is at the target pressure at the outlet of the first evaporator, reducing the rotating speed of the compressor, and keeping the opening degree of the pressure regulating valve unchanged;

in another technical solution of the present invention, referring to fig. 7, the method for controlling the thermal management system further includes:

s32', after determining the relationship between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator, and before adjusting the opening of the pressure regulating valve, the method further includes obtaining the current temperature of the second evaporator, and determining the relationship between the current temperature of the second evaporator and the target temperature of the second evaporator.

Specifically, if the current temperature of the second evaporator is greater than the target temperature of the second evaporator, if the current pressure at the outlet of the first evaporator is greater than or equal to the target pressure at the outlet of the first evaporator, the rotating speed of the compressor is increased; and if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged, or keeping the rotating speed of the compressor unchanged and reducing the opening of the pressure regulating valve.

If the current temperature of the second evaporator is lower than the target temperature of the second evaporator, and if the current pressure at the outlet of the first evaporator is lower than or equal to the target pressure at the outlet of the first evaporator, reducing the rotating speed of the compressor; if the current pressure at the outlet of the first evaporator is larger than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged or keeping the rotating speed of the compressor unchanged and increasing the opening of the pressure regulating valve;

if the current temperature of the second evaporator is equal to the target temperature of the second evaporator, keeping the rotating speed of the compressor unchanged, or keeping the rotating speed of the compressor unchanged, and if the current pressure of the outlet of the first evaporator is larger than the target pressure of the outlet of the first evaporator, increasing the opening of the pressure regulating valve; and if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, reducing the opening degree of the pressure regulating valve.

More specifically, in step S20, when the current temperature of the second evaporator is less than the target temperature of the second evaporator, step S32' specifically includes:

and judging the relation between the current pressure of the outlet of the first evaporator and the target pressure of the outlet of the first evaporator, judging whether the rotating speed of the compressor is the lowest rotating speed or not when the current pressure of the outlet of the first evaporator is smaller than the target pressure of the outlet of the first evaporator, if so, reducing the opening degree of the pressure regulating valve, and otherwise, reducing the rotating speed of the compressor and reducing the opening degree of the pressure regulating valve. And if the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged, and increasing the opening of the pressure regulating valve. And when the current pressure at the outlet of the first evaporator is equal to the target pressure at the outlet of the first evaporator, reducing the rotating speed of the compressor and keeping the opening of the pressure regulating valve unchanged.

In step S20, when the current temperature of the second evaporator is greater than the target temperature of the second evaporator,

step S32' includes: and judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator, and if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged and reducing the opening of the pressure regulating valve. And if the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, judging whether the rotating speed of the compressor is the highest rotating speed or not, if so, increasing the opening degree of the pressure regulating valve, otherwise, increasing the rotating speed of the compressor and increasing the opening degree of the pressure regulating valve. And when the current pressure at the outlet of the first evaporator is at the target pressure at the outlet of the first evaporator, increasing the rotating speed of the compressor and keeping the opening degree of the pressure regulating valve unchanged.

In step S20, when the current temperature of the second evaporator is equal to the target temperature of the second evaporator,

step S32' includes: and judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator, and if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged and reducing the opening of the pressure regulating valve. And if the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged, and increasing the opening of the pressure regulating valve. And when the current pressure at the outlet of the first evaporator is equal to the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor to be changed and keeping the opening of the pressure regulating valve to be unchanged. When the first object and the second object have refrigeration requirements, the opening of the pressure regulating valve and the rotating speed of the compressor are adjusted to ensure that the first object and the second object can meet the cooling requirements of heat generating equipment such as a battery and the like and a passenger compartment. When the first object and the second object have refrigeration requirements, the pressure at the outlet of the first evaporator is adjusted through the pressure adjusting valve at the outlet of the first evaporator, so that the evaporation temperature of the first evaporator is adjusted, and the adjustment capacity of the first evaporator for refrigeration is relatively enhanced by adjusting the evaporation temperature of the first evaporator only by means of the first throttling element and/or adjusting the evaporation temperature of the second evaporator by means of the second throttling element, so that the adjustment capacity of the thermal management system for refrigeration is further enhanced.

In step S0, the air conditioning controller obtains that only the second object has a cooling demand, and the first valve element opens the communication channel between the first port and the third port, closes the communication channel between the first port and the second port, turns on the compressor, and closes the pressure regulating valve. And acquiring the current temperature of the second evaporator and the target temperature of the second evaporator, and adjusting the rotating speed of the compressor according to the relation between the current temperature of the second evaporator and the target temperature of the second evaporator. Specifically, when the current temperature of the second evaporator is less than the target temperature of the second evaporator, the rotation speed of the compressor is reduced; if the current temperature of the second evaporator is higher than the target temperature of the second evaporator, increasing the rotating speed of the compressor; and if the current temperature of the second evaporator is equal to the target temperature of the second evaporator, keeping the rotating speed of the compressor unchanged.

In other embodiments, the thermal management system further comprises a condensing fan for adjusting the speed of the air flow blown to the condenser, and adjusting the heat exchange capacity between the refrigerant and the air flow in the condenser within a certain range. Before the rotating speed of the compressor is adjusted, whether the rotating speed of the compressor is the maximum rotating speed or the minimum rotating speed is judged, specifically, when the current temperature of the second evaporator is lower than the target temperature of the second evaporator, whether the rotating speed of the compressor is the minimum rotating speed is judged, if yes, the rotating speed of a fan of the condenser is reduced, and if not, the rotating speed of the compressor is reduced. And when the current temperature of the second evaporator is higher than the target temperature of the second evaporator, judging whether the rotating speed of the compressor is the maximum rotating speed or not, if so, increasing the rotating speed of the condenser fan, and if not, reducing the rotating speed of the compressor.

Referring to fig. 8 to 11, in a second embodiment of the control of the thermal management system, a control method of the thermal management system includes:

s1, acquiring the current temperature of the first evaporator, and acquiring the current pressure of the outlet of the first evaporator;

s2, judging the relation between the current temperature of the first evaporator and the target temperature of the first evaporator;

when it is determined that the current temperature of the first evaporator is greater than the target temperature of the first evaporator, a target pressure at the outlet of the first evaporator is acquired.

In step S2, the relationship between the current temperature of the first evaporator and the target temperature of the first evaporator includes: the current temperature of the first evaporator is greater than the target temperature of the first evaporator, the current temperature of the first evaporator is equal to the target temperature of the first evaporator, and the current temperature of the first evaporator is less than the target temperature of the first evaporator. Wherein the current temperature of the first evaporator being greater than the target temperature of the first evaporator comprises: the current temperature of the first evaporator is in a first temperature interval and the current temperature of the first evaporator is in a second temperature interval. When the current temperature of the first evaporator is larger than the target temperature of the first evaporator, the current temperature of the first evaporator is judged to be in a first temperature interval or a second temperature interval, if the current temperature of the first evaporator is in the first temperature interval, the first target pressure of the outlet of the first evaporator is obtained, and if the current temperature of the first evaporator is in the second temperature interval, the second target pressure of the outlet of the first evaporator is obtained. And if the current temperature of the first evaporator is in the third temperature interval, namely the current temperature of the first evaporator is less than or equal to the target temperature of the first evaporator, keeping the rotating speed of the compressor and the opening of the pressure regulating valve unchanged. In general, since the difference between the first temperature interval and the third temperature interval is greater than the difference between the second temperature interval and the third temperature interval, the first target pressure is less than the second target pressure, and will not be described in detail. The first target pressure and the second target pressure may be preset in the air conditioner controller, or may be calculated according to other conditions.

In other embodiments, in step S2, the air conditioner controller may also obtain the preset rotation speed of the compressor at the same time, that is: the method comprises the steps of obtaining a first rotating speed of a compressor and operating the compressor when the current temperature of a first evaporator is within a first temperature interval, obtaining a second rotating speed of the compressor and operating the compressor when the current temperature of the first evaporator is within a second temperature interval, and obtaining a second rotating speed of the compressor and operating the compressor because the difference value between the first temperature interval and the third temperature interval is larger than the difference value between the second temperature interval and the third temperature interval, so that the first rotating speed of the compressor is larger than the second rotating speed of the compressor to ensure that the rotating speed of the compressor is matched with the corresponding temperature interval. And if the current temperature of the first evaporator is in the third temperature interval, keeping the rotating speed of the compressor unchanged.

S3, judging the relation between the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet, if the difference between the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet is in a first interval, executing a first adjusting mode, and in the first adjusting mode, adjusting the opening of the pressure regulating valve according to the relation between the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet; and when the difference value between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator is in a second interval, executing a second adjusting mode, and in the second adjusting mode, adjusting the rotating speed of the compressor according to the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator.

The relationship between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator is judged, and the air conditioner controller adjusts the pressure regulating valve or the compressor according to the judgment result of the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator, so that the opening degree adjustment of the pressure regulating valve and the rotation speed adjustment of the compressor are related to the comparison result of the target pressure at the outlet of the first evaporator and the current pressure at the outlet of the first evaporator.

Step S3 specifically includes:

s31, calculating a difference between a current pressure at the outlet of the first evaporator and a target pressure at the outlet of the first evaporator, that is, calculating a current differential pressure at the outlet of the first evaporator, and determining a relationship between the current differential pressure at the outlet of the first evaporator and the target differential pressure at the outlet of the first evaporator. The relationship of the current differential pressure at the first evaporator outlet to the target differential pressure at the first evaporator outlet comprises: the current differential pressure at the outlet of the first evaporator is equal to the target differential pressure at the outlet of the first evaporator, and the current differential pressure at the outlet of the first evaporator is different from the target differential pressure at the outlet of the first evaporator; the current differential pressure at the outlet of the first evaporator being different from the target differential pressure at the outlet of the first evaporator comprises the current differential pressure at the outlet of the first evaporator being in a first interval and the current differential pressure at the outlet of the first evaporator being in a second interval. In the technical scheme of the invention, the target differential pressure at the outlet of the first evaporator is (-p1, p1), wherein p1 may be 0 or not; the first sections are (-p2, -p1) and (p1, p2), and the second sections are (-infinity, -p2) and (p2, infinity), and if the current differential pressure of the first evaporator is at (-p1, p1), the current pressure at the outlet of the first evaporator can be considered to be equal to the target pressure at the outlet of the first evaporator, although p1 can be equal to zero. It can be seen that the first interval is closer to the target differential pressure at the outlet of the first evaporator (-p1, p1) than the second interval, and the closer the current differential pressure at the outlet of the first evaporator is to the target differential pressure of the first evaporator, the closer the current pressure of the first evaporator is to the target pressure of the first evaporator. When the current differential pressure at the outlet of the first evaporator is in the first interval, the current pressure at the outlet of the first evaporator is closer to the target pressure at the outlet of the first evaporator than when the current differential pressure at the outlet of the first evaporator is in the second interval, please refer to fig. 8.

According to step S2, when the current temperature of the first evaporator is in the first temperature interval, the current differential pressure at the outlet of the first evaporator is the difference between the current pressure at the outlet of the first evaporator and the first target pressure; when the current temperature of the first evaporator is in the second temperature interval, the current differential pressure at the outlet of the first evaporator is the difference value between the current pressure at the outlet of the first evaporator and the second target pressure.

S32, according to the step S31, when the current differential pressure at the outlet of the first evaporator is in the first interval, the first adjusting mode is executed. Before executing the first adjustment mode, the control method of the thermal management system further includes: and judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator. Specifically, the first adjustment mode includes: when the current pressure at the outlet of the first evaporator is larger than the target pressure at the outlet of the first evaporator, the opening degree of the pressure regulating valve is increased; when the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, reducing the opening of the pressure regulating valve; and when the current pressure at the outlet of the first evaporator is equal to the target pressure at the outlet of the first evaporator, the opening degree of the pressure regulating valve is kept unchanged.

In executing the first throttling mode, the control method of the thermal management system further includes: before increasing the opening degree of the pressure regulating valve, judging whether the opening degree of the pressure regulating valve is the maximum opening degree or not, if the opening degree of the pressure regulating valve is equal to the maximum opening degree, keeping the opening degree of the pressure regulating valve unchanged, and if the opening degree of the pressure regulating valve is smaller than the maximum opening degree, increasing the opening degree of the pressure regulating valve;

Before reducing the opening degree of the pressure regulating valve, the control method of the thermal management system comprises the following steps: and judging whether the opening degree of the pressure regulating valve is the minimum opening degree or not, if the opening degree of the pressure regulating valve is equal to the minimum opening degree, keeping the opening degree of the pressure regulating valve unchanged, and if the opening degree of the pressure regulating valve is larger than the minimum opening degree, reducing the opening degree of the pressure regulating valve.

When the current differential pressure at the outlet of the first evaporator is in the first interval, the current pressure at the outlet of the first evaporator is closer to the target pressure at the outlet of the first evaporator relative to the second interval, or when the current differential pressure at the outlet of the first evaporator is in the first interval, the current pressure at the outlet of the first evaporator is closer to the target pressure at the outlet of the first evaporator, and the pressure at the outlet of the first evaporator is adjusted by using the pressure adjusting valve, so that the method has the advantage of more accurate adjustment.

According to step S31, the current differential pressure at the outlet of the first evaporator is in the second interval, and the second regulation mode is executed. Prior to executing the second throttling mode, the method of controlling the thermal management system further comprises: and judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator. Specifically, the second adjustment mode includes: if the current pressure at the outlet of the first evaporator is larger than the target pressure at the outlet of the first evaporator, increasing the rotating speed of the compressor; and if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, reducing the rotating speed of the compressor.

While performing the second throttling mode, the control method of the thermal management system further comprises:

before increasing the rotation speed of the compressor, the control method of the thermal management system comprises the following steps: judging whether the rotating speed of the compressor is the maximum rotating speed or not, if the rotating speed of the compressor is equal to the maximum rotating speed, keeping the rotating speed of the compressor unchanged or keeping the rotating speed of the compressor unchanged to increase the opening of the pressure regulating valve, and if the rotating speed of the compressor is less than the maximum rotating speed, increasing the rotating speed of the compressor;

before the rotating speed of the compressor is reduced, the control method of the thermal management system comprises the following steps: and judging whether the rotating speed of the compressor is the minimum rotating speed or not, if the rotating speed of the compressor is equal to the minimum rotating speed, keeping the rotating speed of the compressor unchanged or reducing the rotating speed of the compressor and the opening of the pressure regulating valve, reducing the opening of the pressure regulating valve, and if the rotating speed of the compressor is greater than the minimum rotating speed, reducing the rotating speed of the compressor. When the current pressure at the outlet of the first evaporator is in the second differential pressure interval, the current pressure at the outlet of the first evaporator is relatively far away from the target pressure at the outlet of the first evaporator, and the pressure at the outlet of the first evaporator is adjusted by the compressor, so that the device has the advantage of quick adjustment and is beneficial to saving the adjustment time.

In another embodiment of the present invention, the method for controlling a thermal management system further includes step S0, specifically, step S0 includes step S01, and step S01 includes: and acquiring the refrigeration requirement of the heat management system, and adjusting the first valve according to the refrigeration requirement of the heat management system. Specifically, the refrigeration requirements of the thermal management system include that the first object has refrigeration requirements and/or the second object has refrigeration requirements, that is, the first object has refrigeration requirements, or the second object has refrigeration requirements, or both the first object and the second object have refrigeration requirements. If the first object has a refrigeration requirement, the heat management system opens a communication channel between a first interface of the first valve and a second interface of the first valve, and after being discharged from the condenser, the refrigerant flows into the first throttling element from the second interface; if the second object has a refrigeration requirement, the heat management system opens a communication channel between the first interface and the third interface, and after being discharged from the condenser, the refrigerant flows into the second evaporator from the third interface; if the first object and the second object both have refrigeration requirements, the heat management system opens a communication channel between the first interface and the second interface, the heat management system opens a communication channel between the first interface and the third interface, and the refrigerant flows into the first throttling element and the second throttling element after being discharged from the condenser and then respectively enters the first evaporator and the second evaporator. The refrigeration requirement of the heat management system can be calculated according to the air conditioner controller, can also be sent to the air conditioner controller by other equipment, and can also be input by a user through a human-computer interaction interface.

Before the step S1 "acquiring the current temperature of the first evaporator, acquiring the current pressure at the outlet of the first evaporator", the step S0 further includes the step S02: and opening the pressure regulating valve. The opening degree of the pressure regulating valve is 0-100%, wherein 0 is closed, and 100% is fully opened. Specifically, if the first object has a refrigeration demand, the pressure regulating valve is opened or the opening state of the pressure regulating valve is maintained, wherein the "opening" or "opening state" is not closed, and otherwise, the pressure regulating valve is closed or the closing state of the pressure regulating valve is maintained; in the technical scheme of the invention, the first throttling element and the second throttling element can be thermal expansion valves or throttling pipes, and at this time, before the compressor is started, no adjustment is needed, and if the first throttling element and/or the second throttling element are electronic expansion valves, before the compressor is started, the first throttling element and/or the second throttling element are/is started, so that the electronic expansion valves or the compressor is prevented from being damaged.

Before the step S1 "acquiring the current temperature of the first evaporator, acquiring the current pressure at the outlet of the first evaporator", the step S0 further includes the step S03: the compressor is turned on. Otherwise, in step S1, it is meaningless to acquire the pressure at the outlet of the first evaporator.

In step S0, when the air conditioning controller obtains information that only the first object has a cooling demand, the first valve opens the communication channel between the first port and the second port, closes the channel between the first port and the third port, and opens the compressor and the pressure regulating valve.

In step S0, if the air conditioner controller obtains the information that the first object and the second object both have the cooling requirements, the first valve opens the communication channel between the first interface and the second interface, and the compressor and the pressure regulating valve are turned on. Acquiring the current temperature of the first evaporator and the current temperature of the second evaporator, and acquiring the current pressure at the outlet of the first evaporator, where step S2 specifically includes:

s2 further includes: acquiring the current temperature of the second evaporator, and comparing the relationship between the current temperature of the second evaporator and the target temperature of the second evaporator; in the solution of the invention, the second evaporator is intended to reduce the temperature of the passenger compartment, in order to guarantee the comfort of the passengers. The comparison result of the current temperature of the second evaporator and the target temperature of the second evaporator includes: the current temperature of the second evaporator is equal to the target temperature range of the second evaporator, at this time, the passenger has better experience, the current temperature of the second evaporator is less than the target temperature of the second evaporator, at this time, the passenger has cooler experience, the current temperature of the second evaporator is greater than the target temperature of the second evaporator, and at this time, the passenger has hotter experience. The target temperature of the second evaporator may be stored in the air conditioner controller, or may be input from the outside, for example, input by a user through a human-computer interface, and the second target temperature may be a value T2s, for example, 15 ℃, or a temperature range [ T2s1, T2s2], for example, [10 ℃, 20 ℃ ].

In step S3, the control method of the thermal management system further includes: adjusting the rotation speed of the compressor according to the relation between the current temperature of the second evaporator and the target temperature of the second evaporator;

specifically, the current temperature of the second evaporator is obtained, the relationship between the current temperature of the second evaporator and the target temperature of the second evaporator is judged, and if the current temperature of the second evaporator is higher than the target temperature of the second evaporator, the rotating speed of the compressor is increased; if the current temperature of the second evaporator is equal to the target temperature of the second evaporator, keeping the rotating speed of the compressor unchanged; the current temperature of the second evaporator is less than the target temperature of the second evaporator, reducing the rotational speed of the compressor. It can be seen that in the solution according to the invention the temperature of the second evaporator is regulated by the rotational speed of the compressor.

The control method of the thermal management system is applied to the thermal management system, the thermal management system comprises a first branch and a second branch, the first branch and the second branch are arranged in parallel, wherein the first branch comprises a first evaporator and a pressure regulating valve, the second branch comprises a second evaporator, wherein the pressure regulating valve is arranged between the outlet of the first evaporator and the inlet of the compressor and used for regulating the pressure at the outlet of the first evaporator, the thermal management system can regulate the opening of the pressure regulating valve according to the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator, the evaporation pressure of the first evaporator is adjusted and regulated through a pressure regulating valve arranged at the outlet of the first evaporator, so that the evaporation temperature of the first evaporator is adjusted, or the heat management system can relatively independently adjust the evaporation temperature of the first evaporator, so that the refrigerating adjusting capacity of the heat management system can be improved.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that various combinations, modifications and equivalents of the present invention can be made by those skilled in the art, and all technical solutions and modifications thereof without departing from the spirit and scope of the present invention are encompassed by the claims of the present invention.

Claims

1. A heat management system comprises a compressor, a first branch and a second branch, wherein the first branch and the second branch are arranged in parallel, the first branch comprises a first evaporator and a pressure regulating valve, the pressure regulating valve is arranged between an outlet of the first evaporator and an inlet of the compressor, and the outlet of the first evaporator can be communicated with the inlet of the compressor through the pressure regulating valve; the second branch comprises a second evaporator, an outlet of the second evaporator can be communicated with an inlet of the compressor, and an outlet of the compressor can be communicated with an inlet of the first evaporator and/or an inlet of the second evaporator; the heat management system also comprises an air conditioner controller, the air conditioner controller is in signal connection with the compressor and the pressure regulating valve, the air conditioner controller can adjust the rotating speed of the compressor, and the air conditioner controller can adjust the opening of the pressure regulating valve;

The air conditioner controller acquires the current temperature of the first evaporator and the current pressure of the outlet of the first evaporator; when the air conditioner controller judges that the current temperature of the first evaporator is higher than the target temperature of the first evaporator, the target pressure of the outlet of the first evaporator is obtained; adjusting the opening degree of the pressure regulating valve according to the relation between the current pressure of the first evaporator outlet and the target pressure of the first evaporator outlet;

the "adjusting the opening degree of the pressure regulating valve according to the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator" includes: if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, adjusting the opening of the pressure regulating valve according to the relation between the rotating speed of the compressor and the lowest rotating speed; and if the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, adjusting the opening of the pressure regulating valve according to the relation between the rotating speed of the compressor and the maximum rotating speed.

2. The thermal management system of claim 1, wherein said adjusting the opening of the pressure regulating valve according to the relationship between the current pressure at the first evaporator outlet and the target pressure at the first evaporator outlet comprises: when the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, reducing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, increasing the opening degree of the pressure regulating valve; and when the current pressure at the outlet of the first evaporator is equal to the target pressure at the outlet of the first evaporator, keeping the opening degree of the pressure regulating valve unchanged.

3. The thermal management system according to claim 1 or 2, wherein a first temperature interval, a second temperature interval and a third temperature interval are defined, wherein any temperature included in the first temperature interval is greater than any temperature included in the second temperature interval and any temperature included in the third temperature interval, wherein the temperature of the second temperature interval is greater than the temperature of the third temperature interval, and wherein the third temperature interval is defined to be less than or equal to a target temperature of the first evaporator; before obtaining the target pressure at the outlet of the first evaporator, the method further comprises: the air conditioner controller determines that the current temperature of the first evaporator is greater than the target temperature of the first evaporator; the "the current temperature of the first evaporator is greater than the target temperature of the first evaporator" includes: the current temperature of the first evaporator is in the first temperature interval, or the current temperature of the first evaporator is in the second temperature interval;

the acquiring the target pressure at the outlet of the first evaporator when the current temperature of the first evaporator is greater than the target temperature of the first evaporator includes: the current temperature of the first evaporator is in the first temperature interval, and a first target pressure of the outlet of the first evaporator is obtained; the current temperature of the first evaporator is in the second temperature interval, and a second target pressure of the outlet of the first evaporator is obtained; wherein the first target pressure is less than the second target pressure.

4. The thermal management system of claim 3, wherein "the current temperature of the first evaporator is greater than the target temperature of the first evaporator" comprises: the current temperature of the first evaporator is in the first temperature interval, or the current temperature of the first evaporator is in the second temperature interval;

setting the rotating speed of the compressor when the current temperature of the first evaporator is higher than the target temperature of the first evaporator; if the current temperature of the first evaporator is in the first temperature interval, setting a first rotating speed of the compressor; setting a second rotating speed of the compressor when the current temperature of the first evaporator is in the second temperature interval; wherein the first rotational speed of the compressor is greater than the second rotational speed of the compressor.

5. The thermal management system of claim 3, wherein said adjusting the opening of the pressure regulating valve according to the relationship between the current pressure at the first evaporator outlet and the target pressure at the first evaporator outlet further comprises: judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator; if the current temperature of the first evaporator is in the first temperature interval, judging the relation between the current pressure at the outlet of the first evaporator and the first target pressure; if the current temperature of the first evaporator is in the second temperature interval, judging the relationship between the current pressure at the outlet of the first evaporator and the second target pressure;

The "adjusting the opening degree of the pressure regulating valve according to the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator" includes:

when the current pressure at the outlet of the first evaporator is smaller than the first target pressure, reducing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is higher than the first target pressure, the opening degree of the pressure regulating valve is increased; when the current pressure at the outlet of the first evaporator is equal to the first target pressure, keeping the opening of the pressure regulating valve unchanged;

when the current pressure at the outlet of the first evaporator is lower than the second target pressure, reducing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is higher than the second target pressure, the opening degree of the pressure regulating valve is increased; and when the current pressure at the outlet of the first evaporator is equal to the second target pressure, keeping the opening degree of the pressure regulating valve unchanged.

6. The thermal management system of claim 4, wherein said adjusting the opening of the pressure regulating valve according to the relationship between the current pressure at the first evaporator outlet and the target pressure at the first evaporator outlet further comprises: judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator; if the current temperature of the first evaporator is in the first temperature interval, judging the relation between the current pressure at the outlet of the first evaporator and the first target pressure; if the current temperature of the first evaporator is in the second temperature interval, judging the relationship between the current pressure at the outlet of the first evaporator and the second target pressure;

when the current pressure at the outlet of the first evaporator is smaller than the first target pressure, reducing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is higher than the first target pressure, increasing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is equal to the first target pressure, keeping the opening of the pressure regulating valve unchanged;

7. The thermal management system of any of claims 1 or 2 or 4-6, further comprising a first throttling element, a second throttling element, a first valve, and a condenser, wherein the first valve comprises a first port, a second port, and a third port, wherein the outlet of the compressor is in communication with the first port through the condenser, wherein the second port is capable of being in communication with the inlet of the first evaporator through the first throttling element, and wherein the third port is capable of being in communication with the inlet of the second evaporator through the second throttling element;

Before the current temperature of the first evaporator and the current pressure at the outlet of the first evaporator are obtained, the air conditioner controller obtains the refrigeration requirement of the heat management system, and adjusts the first valve according to the refrigeration requirement of the heat management system; wherein the refrigeration requirements of the thermal management system include refrigeration requirements at the first object and/or refrigeration requirements at the second object;

if the first object has a refrigeration demand, the thermal management system opens a communication channel between the first interface and the second interface; if the second object has a refrigeration requirement, the thermal management system opens a communication channel between the first interface and the third interface; if the first object and the second object both have refrigeration requirements, the thermal management system opens a communication channel between the first interface and the second interface, and the thermal management system opens a communication channel between the first interface and the third interface.

8. The thermal management system of claim 3, further comprising a first throttling element, a second throttling element, a first valve, and a condenser, the first valve comprising a first port through which the outlet of the compressor communicates, a second port through which the second port can communicate with the inlet of the first evaporator, and a third port through which the third port can communicate with the inlet of the second evaporator;

9. The thermal management system of claim 7, wherein said adjusting the opening of the pressure regulating valve according to the relationship between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator, if the first object has a cooling demand, comprises:

If the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, judging whether the rotating speed of the compressor is the lowest rotating speed or not, if the rotating speed of the compressor is the lowest rotating speed, reducing the opening degree of the pressure regulating valve, if the rotating speed of the compressor is greater than the lowest rotating speed, reducing the rotating speed of the compressor, and keeping the opening degree of the pressure regulating valve unchanged or reducing the opening degree of the pressure regulating valve;

if the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, judging whether the rotating speed of the compressor is the highest rotating speed or not, if the rotating speed of the compressor is the highest rotating speed, increasing the opening degree of the pressure regulating valve, and if the rotating speed of the compressor is less than the highest rotating speed, increasing the rotating speed of the compressor;

and if the current pressure at the outlet of the first evaporator is equal to the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged, and keeping the opening of the pressure regulating valve unchanged.

10. The thermal management system according to claim 7, wherein if the first object and the second object both have a refrigeration demand, the air conditioner controller obtains a current temperature of the second evaporator, determines a relationship between the current temperature of the second evaporator and a target temperature of the second evaporator, and adjusts a rotation speed of the compressor according to the relationship between the current temperature of the second evaporator and the target temperature of the second evaporator and the relationship between a current pressure at an outlet of the first evaporator and a target pressure at an outlet of the first evaporator;

If the current temperature of the second evaporator is higher than the target temperature of the second evaporator, and if the current pressure at the outlet of the first evaporator is higher than or equal to the target pressure at the outlet of the first evaporator, increasing the rotating speed of the compressor; if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged, or keeping the rotating speed of the compressor unchanged and reducing the opening of the pressure regulating valve;

if the current temperature of the second evaporator is lower than the target temperature of the second evaporator, and if the current pressure at the outlet of the first evaporator is lower than or equal to the target pressure at the outlet of the first evaporator, reducing the rotating speed of the compressor; if the current pressure at the outlet of the first evaporator is larger than the target pressure at the outlet of the first evaporator, keeping the rotating speed of the compressor unchanged, or keeping the rotating speed of the compressor unchanged and increasing the opening of the pressure regulating valve;

if the current temperature of the second evaporator is equal to the target temperature of the second evaporator, keeping the rotating speed of the compressor unchanged; or when the rotating speed of the compressor is kept unchanged, if the current pressure at the outlet of the first evaporator is larger than the target pressure at the outlet of the first evaporator, the opening degree of the pressure regulating valve is increased; and if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, reducing the opening degree of the pressure regulating valve.

11. The thermal management system of claim 10, wherein said increasing the speed of said compressor further comprises: judging whether the rotating speed of the compressor is the maximum rotating speed or not, if the rotating speed of the compressor is the maximum rotating speed, keeping the rotating speed of the compressor unchanged, increasing the opening degree of the pressure regulating valve, and if the rotating speed of the compressor is less than the maximum rotating speed, increasing the rotating speed of the compressor and increasing the opening degree of the pressure regulating valve;

before the step of reducing the rotation speed of the compressor, the method further comprises the following steps: and judging whether the rotating speed of the compressor is the minimum rotating speed or not, if so, keeping the rotating speed of the compressor unchanged, reducing the opening degree of the pressure regulating valve, and if the rotating speed of the compressor is greater than the minimum rotating speed of the compressor, reducing the rotating speed of the compressor and reducing the opening degree of the pressure regulating valve.

12. A control method of a thermal management system is applied to the thermal management system, the thermal management system comprises a compressor, the thermal management system further comprises a first branch and a second branch, the first branch and the second branch are arranged in parallel, the first branch comprises a first evaporator and a pressure regulating valve, the pressure regulating valve is arranged between an outlet of the first evaporator and an inlet of the compressor, and an outlet of the first evaporator can be communicated with the inlet of the compressor through the pressure regulating valve; the second branch comprises a second evaporator, an outlet of the second evaporator can be communicated with an inlet of the compressor, and an outlet of the compressor can be communicated with an inlet of the first evaporator and/or an inlet of the second evaporator; the heat management system also comprises an air conditioner controller, the air conditioner controller is in signal connection with the compressor and the pressure regulating valve, the air conditioner controller can be used for regulating the rotating speed of the compressor, and the air conditioner controller can be used for regulating the opening degree of the pressure regulating valve;

13. The control method according to claim 12, wherein the step of "adjusting the opening degree of the pressure-regulating valve in accordance with the relationship between the current pressure at the first evaporator outlet and the target pressure at the first evaporator outlet" includes: when the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, reducing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is greater than the target pressure at the outlet of the first evaporator, increasing the opening degree of the pressure regulating valve; and when the current pressure of the outlet of the first evaporator is equal to the target pressure of the outlet of the first evaporator, keeping the opening degree of the pressure regulating valve unchanged.

14. The control method according to claim 12 or 13, characterized by defining a first temperature zone, a second temperature zone and a third temperature zone, wherein any temperature included in the first temperature zone is higher than any temperature included in the second temperature zone and any temperature included in the third temperature zone, wherein the temperature of the second temperature zone is higher than the temperature of the third temperature zone, and wherein the third temperature zone is defined to be less than or equal to a target temperature of the first evaporator; before the step of obtaining the target pressure at the outlet of the first evaporator, the method further comprises the following steps: the air conditioner controller judges that the current temperature of the first evaporator is greater than the target temperature of the first evaporator; the "the current temperature of the first evaporator is greater than the target temperature of the first evaporator" includes: the current temperature of the first evaporator is in the first temperature interval, or the current temperature of the first evaporator is in the second temperature interval;

the step of acquiring the target pressure at the outlet of the first evaporator when the current temperature of the first evaporator is different from the target temperature of the first evaporator includes: the current temperature of the first evaporator is in the first temperature interval, and a first target pressure of the outlet of the first evaporator is obtained; the current temperature of the first evaporator is in the second temperature interval, and a second target pressure of the outlet of the first evaporator is obtained; wherein the first target pressure is less than the second target pressure.

15. The control method according to claim 14, wherein the "the current temperature of the first evaporator is greater than the target temperature of the first evaporator" includes: the current temperature of the first evaporator is in the first temperature interval, or the current temperature of the first evaporator is in the second temperature interval;

the control method of the thermal management system further comprises the following steps: setting the rotating speed of the compressor when the current temperature of the first evaporator is higher than the target temperature of the first evaporator; if the current temperature of the first evaporator is in the first temperature interval, setting a first rotating speed of the compressor; setting a second rotating speed of the compressor when the current temperature of the first evaporator is in the second temperature interval;

wherein the first rotational speed of the compressor is greater than the second rotational speed of the compressor.

16. The control method according to claim 14, wherein the step of "adjusting the opening degree of the pressure-regulating valve in accordance with the relationship between the current pressure at the first evaporator outlet and the target pressure at the first evaporator outlet" further comprises: judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator; if the current temperature of the first evaporator is in the first temperature interval, judging the relation between the current pressure at the outlet of the first evaporator and the first target pressure; if the current temperature of the first evaporator is in the second temperature interval, judging the relationship between the current pressure at the outlet of the first evaporator and the second target pressure;

The step of "adjusting the opening degree of the pressure-regulating valve in accordance with the relationship between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator" includes:

17. The control method according to claim 15, wherein the step of "adjusting the opening degree of the pressure-regulating valve in accordance with the relationship between the current pressure at the first evaporator outlet and the target pressure at the first evaporator outlet" further comprises: judging the relation between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator; if the current temperature of the first evaporator is in the first temperature interval, judging the relation between the current pressure at the outlet of the first evaporator and the first target pressure; if the current temperature of the first evaporator is in the second temperature interval, judging the relationship between the current pressure at the outlet of the first evaporator and the second target pressure;

when the current pressure at the outlet of the first evaporator is lower than the first target pressure, reducing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is higher than the first target pressure, increasing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is equal to the first target pressure, keeping the opening of the pressure regulating valve unchanged;

when the current pressure at the outlet of the first evaporator is lower than the second target pressure, reducing the opening degree of the pressure regulating valve; when the current pressure at the outlet of the first evaporator is higher than the second target pressure, increasing the opening degree of the pressure regulating valve; and when the current pressure at the outlet of the first evaporator is equal to the second target pressure, keeping the opening degree of the pressure regulating valve unchanged.

18. The control method of any of claims 12 or 13 or 15-17, wherein the thermal management system further comprises a first throttling element, a second throttling element, a first valve element, and a condenser, wherein the first valve element comprises a first port, a second port, and a third port, wherein the outlet of the compressor is in communication with the first port through the condenser, wherein the second port is capable of being in communication with the inlet of the first evaporator through the first throttling element, and wherein the third port is capable of being in communication with the inlet of the second evaporator through the second throttling element;

Before the current temperature of the first evaporator and the current pressure of the outlet of the first evaporator are obtained, the air conditioner controller obtains the refrigeration requirement of the heat management system, and the first valve is adjusted according to the refrigeration requirement of the heat management system; wherein the refrigeration requirements of the thermal management system include refrigeration requirements at the first object and/or refrigeration requirements at the second object;

if the first object has a refrigeration requirement, the thermal management system opens a communication channel between the first interface and the second interface; if the second object has a refrigeration requirement, the thermal management system opens a communication channel between the first interface and the third interface; if the first object and the second object both have refrigeration requirements, the thermal management system opens a communication channel between the first interface and the second interface, and the thermal management system opens a communication channel between the first interface and the third interface.

19. The control method of claim 18, wherein if the first object has a cooling demand, the adjusting the opening degree of the pressure regulating valve according to the relationship between the current pressure at the outlet of the first evaporator and the target pressure at the outlet of the first evaporator comprises:

20. The control method according to claim 18, wherein if the first object and the second object both have a refrigeration demand, the air conditioning controller obtains a current temperature of the second evaporator, determines a relationship between the current temperature of the second evaporator and a target temperature of the second evaporator, and adjusts the rotation speed of the compressor according to the relationship between the current temperature of the second evaporator and the target temperature of the second evaporator and the relationship between a current pressure at an outlet of the first evaporator and a target pressure at an outlet of the first evaporator;

if the current temperature of the second evaporator is equal to the target temperature of the second evaporator, keeping the rotating speed of the compressor unchanged, or increasing the opening degree of the pressure regulating valve if the current pressure of the outlet of the first evaporator is greater than the target pressure of the outlet of the first evaporator while keeping the rotating speed of the compressor unchanged; and if the current pressure at the outlet of the first evaporator is smaller than the target pressure at the outlet of the first evaporator, reducing the opening degree of the pressure regulating valve.

21. The control method according to claim 20, wherein the step of "increasing the rotation speed of the compressor" further comprises: judging whether the rotating speed of the compressor is the maximum rotating speed or not, if the rotating speed of the compressor is the maximum rotating speed of the compressor, keeping the rotating speed of the compressor unchanged, increasing the opening degree of the pressure regulating valve, and if the rotating speed of the compressor is less than the maximum rotating speed of the compressor, increasing the rotating speed of the compressor and increasing the opening degree of the pressure regulating valve;

before the step of reducing the rotating speed of the compressor, the method also comprises the following steps: and judging whether the rotating speed of the compressor is the minimum rotating speed or not, if so, keeping the rotating speed of the compressor unchanged, reducing the opening degree of the pressure regulating valve, and if so, reducing the rotating speed of the compressor and reducing the opening degree of the pressure regulating valve.