Vehicle passenger compartment rapid cooling control method based on frosting-defrosting

Abstract

The invention relates to a frosting-defrosting-based quick cooling control method for a vehicle passenger compartment, which is used for controlling an automobile refrigerating system and comprises the following steps of: S1, firstly, increasing the rotating speed of a compressor to the maximum for refrigerating, and allowing an evaporator to frost during cooling, so that the evaporation temperature is lower than 0 DEG C; s2, when the evaporator is frosted to a set degree, the speed of the compressor is reduced to enable the evaporation temperature to rise to 0 DEG C again, the rotating speed is kept unchanged, and the evaporator is defrosted; and S3, after defrosting of the evaporator is finished, whether the temperature of the passenger compartment of the vehicle reaches a set value or not is judged, if not, S1 and S2 continue to be repeated till the temperature of the passenger compartment of the vehicle reaches the set value, and normal control over the refrigerating system of the vehicle is switched to. Compared with the prior art, the evaporator is allowed to frost during cooling, the problem that the cooling speed of an existing vehicle passenger compartment is not high enough is solved, and the influence on the service life of a compressor is small; and the control method adopted by the invention is simple in implementation mode and has a very good application scene.

Description

Technical Field

[0001] The invention relates to the technical field of rapid cooling control, and in particular to a rapid cooling control method for a vehicle passenger compartment based on frosting and defrosting. Background Art

[0002] In hot weather, the temperature inside the passenger compartment of a car parked outdoors can rise dramatically and may even reach dangerously high levels, which not only reduces the comfort of passengers but may also pose a threat to their health, especially for children, the elderly and other people with poor physical fitness.

[0003] If the car's cooling speed is slow, the passenger compartment will be exposed to high temperatures for a long time, which may cause symptoms such as heat stroke and dehydration, and even endanger the lives of passengers. In addition, excessively high temperatures in the car can affect the emotions of passengers, distract the driver's attention, and increase the risk of traffic accidents. High temperatures can also damage electronic equipment and interior decoration in the car, which may shorten their service life, thereby increasing the cost of repair and replacement. For passengers waiting in the car, the inability to cool down quickly may lead to reduced work efficiency and affect daily activities and itineraries. Therefore, rapid cooling of the car is particularly critical. Quickly lowering the temperature in the car's passenger compartment to the set temperature is essential to ensure the comfort, health and safety of passengers, and it also helps to protect the performance of the vehicle and extend its service life.

[0004] The common control principle of traditional automobile air-conditioning refrigeration systems is to control the evaporation temperature to 0°C through the compressor, and quickly cool the system while ensuring that the evaporator does not frost. However, the pain point is that the cooling speed is not fast enough.

[0005] Chinese patent CN114670599A provides a control method and system for automobile air conditioners, which collects temperature information sets through vehicle sensors; obtains user-set temperature; calculates constant temperature energy demand information based on the temperature information generated in the car, the temperature information generated by sunlight, the temperature information of the environment outside the car, and the user-set temperature; obtains the air conditioner working temperature based on the constant temperature energy demand information, and generates control parameter information according to the air conditioner working temperature, and the control parameter information is used to control the air outlet temperature of the automobile air conditioner according to the air conditioner working temperature. However, this invention focuses on adjusting the temperature in the car by collecting temperature information.

[0006] Chinese patent CN118082460A provides a method for controlling an automobile exhaust valve, including: obtaining automobile air conditioning signals, interior temperature, exterior temperature, interior relative humidity and interior glass temperature, and calculating the interior dew point temperature according to the interior relative humidity and interior glass temperature; when the air conditioning mode is an external circulation mode or a mixed air mode, comparing the interior temperature with the exterior temperature, or comparing the interior glass temperature with the interior dew point temperature, and determining whether the exhaust valve needs to be opened according to the comparison result. The automobile exhaust valve control method and device of the invention can realize the functions of rapid cooling and dehumidification in the vehicle.

[0007] Chinese patent CN116101025A relates to an automobile air conditioner, a control method and a control device for the automobile air conditioner, and an automobile. The patent can reasonably distribute the air volume by controlling the damper, so that the automobile air conditioner can simultaneously meet the cooling needs of the automatic driving module and the passenger compartment.

[0008] The above patents focus on controlling a specific component of the vehicle to achieve rapid cooling and other purposes. Most of the patents that have been disclosed so far achieve rapid cooling control and other purposes by designing new systems and structures.

[0009] The existing refrigeration system market has developed to a relatively mature stage and has a wide product coverage. Therefore, how to propose a new control method on the basis of not changing the original refrigeration system to quickly meet the cooling needs of the passenger compartment has become a technical problem to be solved. Summary of the invention

[0010] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a vehicle passenger compartment rapid cooling control method based on frosting and defrosting, so as to accelerate the cooling speed of the passenger compartment.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] A vehicle passenger compartment rapid cooling control method based on frosting and defrosting, used for controlling a vehicle refrigeration system, comprises the following steps:

[0013] S1. When the refrigeration system enters the rapid cooling mode, the compressor speed is increased to the maximum for cooling, and the evaporator is allowed to frost during cooling. At this time, the evaporation temperature is lower than 0℃, and the overall cooling speed is greatly improved;

[0014] S2: When the evaporator is frosted to a set degree, the compressor is slowed down to raise the evaporation temperature back to 0°C, and the speed is kept unchanged, so that the evaporator begins to defrost by external heat exchange;

[0015] S3, wait for the evaporator to defrost and the evaporation temperature is higher than 0℃, and judge whether the vehicle passenger compartment temperature reaches the set value. If it does not reach the set value, continue to increase the compressor speed to the maximum, repeat S1 and S2 until the vehicle passenger compartment temperature reaches the set value, and then switch to normal control of the vehicle refrigeration system.

[0016] Furthermore, the evaporation temperature is detected and acquired by a first temperature sensor.

[0017] Furthermore, the temperature of the vehicle passenger compartment is detected and acquired by a second temperature sensor.

[0018] Furthermore, the degree of frosting and defrosting of the evaporator is determined by the evaporation temperature, and the defrosting method of the evaporator is that the evaporator exchanges heat with the air, and no additional heat needs to be introduced, which is more energy-efficient.

[0019] Furthermore, the automobile refrigeration system includes a refrigerant circuit and an air circuit.

[0020] Furthermore, the refrigerant circuit includes a compressor, a condenser, a throttle valve, an evaporator, and a refrigerant channel; the exhaust port of the compressor is connected to the condenser, the inlet of the compressor is connected to the evaporator, the throttle valve is arranged between the outlet of the condenser and the inlet of the evaporator, and the compressor, condenser, throttle valve and evaporator are connected in sequence by the refrigerant channel.

[0021] Furthermore, the refrigerant cycle process of the refrigeration system is as follows: the high-temperature and high-pressure refrigerant gas discharged from the compressor exhaust port enters the refrigerant channel of the condenser, releases heat to the air, and condenses into a high-temperature and high-pressure refrigerant liquid; the liquid refrigerant enters the throttle valve, and is throttled to become a low-temperature and low-pressure two-phase flow; the low-temperature and low-pressure two-phase flow enters the refrigerant channel of the evaporator, evaporates through heat exchange with the air, and finally evaporates into a low-temperature and low-pressure refrigerant gas; the low-temperature and low-pressure refrigerant gas flows into the compressor and is compressed into a high-temperature and high-pressure gas, forming a refrigerant cycle.

[0022] Further preferably, the throttle valve is an electronic expansion valve.

[0023] Furthermore, the air flow path includes a cooling fan, a blower, and an air channel; the cooling fan is arranged between the condenser and the evaporator, the blower is arranged on the other side of the evaporator, and the condenser, cooling fan, evaporator and blower are connected in sequence by the air channel.

[0024] Furthermore, the air handling process of the refrigeration system is as follows: the air intake on the condenser side passes through the cooling fan, so that the air passes through the air channel of the condenser, absorbs heat from the high-temperature and high-pressure refrigerant gas, the temperature rises, and is subsequently discharged; the air intake on the evaporator side passes through the blower, so that the air passes through the air channel of the evaporator, is cooled, and then blown into the vehicle.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention provides a vehicle passenger compartment rapid cooling control method based on frosting and defrosting, which adopts a special control method that allows frosting, so that there is no need to worry about frosting during actual refrigeration system operation; and compared with other control methods that require the use of frost suppression measures, the present invention can increase the compressor speed to the maximum for refrigeration, which makes the refrigeration system cool faster and can quickly reduce the temperature inside the vehicle to the set value; compared with refrigeration systems that require the introduction of heat for defrosting, the evaporator of the present invention uses external air heat exchange for defrosting, and no additional heat needs to be introduced, which is more energy-efficient.

[0027] (2) The present invention is aimed at special working conditions, such as external conditions where the temperature is not high but refrigeration is still required. Frost will form even if the compressor speed is adjusted to the lowest. At this time, the general refrigeration system can only switch the compressor on and off at a high frequency, which will affect the service life of the compressor and cause serious NHV (noise, vibration and harshness) problems. The control method of the present invention allows frosting, and the overall frequency of switching the compressor on and off is low, which has little impact on the life of the compressor.

[0028] (3) The present invention proposes a new control method based on the original mature refrigeration system to quickly meet the cooling needs of the passenger compartment. The present invention has rapid results and broad market application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of a vehicle passenger compartment rapid cooling control method based on frosting and defrosting of the present invention;

[0030] Figure 2 The present invention is a schematic diagram of an application scenario of a vehicle passenger compartment rapid cooling control method based on frosting and defrosting.

[0031] The names corresponding to the reference numerals in the accompanying drawings are: 1-compressor; 2-condenser; 3-throttle valve; 4-evaporator; 5-cooling fan; 6-blower. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent: in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0036] In the following implementation modes or examples, unless otherwise specified, features such as structure / module name, control mode, algorithm, process or composition ratio are deemed to be common technical features disclosed in the prior art.

[0037] Example 1

[0038] See also Figure 1 This embodiment provides a vehicle passenger compartment rapid cooling control method based on frosting-defrosting, which is used for controlling a vehicle refrigeration system, and includes the following steps:

[0039] S1, when the refrigeration system enters the rapid cooling mode, the compressor 1 speed is increased to the maximum for cooling, and the evaporator 4 is allowed to frost during cooling. At this time, the evaporation temperature is -5°C;

[0040] S2, when the evaporator 4 is frosted to a set degree, the compressor 1 is decelerated to raise the evaporation temperature back to 0°C, and the speed is kept unchanged, so that the evaporator 4 begins to defrost by external heat exchange;

[0041] S3, wait for the defrosting of the evaporator 4 to be completed, at which time the evaporation temperature is 3°C, and determine whether the temperature of the vehicle passenger compartment has reached the set value. If it has not reached the set value, continue to increase the speed of the compressor 1 to the maximum, repeat S1 and S2 until the temperature of the vehicle passenger compartment has reached the set value, and then switch to normal control of the vehicle refrigeration system.

[0042] In this embodiment, the evaporation temperature is detected and acquired by a first temperature sensor.

[0043] In this embodiment, the vehicle passenger compartment temperature is detected and acquired by a second temperature sensor.

[0044] In this embodiment, the frosting temperature and defrosting degree of the evaporator 4 are determined by the evaporation temperature, and the defrosting method of the evaporator 4 is that the evaporator 4 exchanges heat with the air.

[0045] The present invention is generally applied to the control of a vehicle refrigeration system. In this embodiment, the refrigeration system includes a refrigerant circuit and an air flow path.

[0046] The refrigerant circuit includes a compressor 1, a condenser 2, a throttle valve 3, an evaporator 4, and a refrigerant channel.

[0047] Specifically, the exhaust port of the compressor 1 is connected to the condenser 2, the inlet of the compressor 1 is connected to the evaporator 4, the throttle valve 3 is arranged between the outlet of the condenser 2 and the inlet of the evaporator 4, and the compressor 1, condenser 2, throttle valve 3 and evaporator 4 are connected in sequence by a refrigerant channel.

[0048] In this embodiment, the refrigerant cycle process of the automobile refrigeration system is as follows: the high-temperature and high-pressure refrigerant gas discharged from the exhaust port of the compressor 1 enters the refrigerant channel of the condenser 2, releases heat to the air, and condenses into a high-temperature and high-pressure refrigerant liquid; the liquid refrigerant enters the throttle valve 3, and is throttled to become a low-temperature and low-pressure two-phase flow; the low-temperature and low-pressure two-phase flow enters the refrigerant channel of the evaporator 4, evaporates through heat exchange with the air, and finally evaporates into a low-temperature and low-pressure refrigerant gas; the low-temperature and low-pressure refrigerant gas flows into the compressor 1 and is compressed into a high-temperature and high-pressure gas, forming a refrigerant cycle.

[0049] In this embodiment, the throttle valve 3 is an electronic expansion valve.

[0050] In this embodiment, the air flow path includes a cooling fan 5, a blower 6, and an air channel;

[0051] Specifically, the cooling fan 5 is disposed between the condenser 2 and the evaporator 4, the blower 6 is disposed on the other side of the evaporator 4, and the condenser 2, the cooling fan 5, the evaporator 4 and the blower 6 are sequentially connected by an air passage.

[0052] In this embodiment, the air processing process of the automobile refrigeration system is as follows: the air intake on the condenser 2 side passes through the cooling fan 5, so that the air passes through the air channel of the condenser 2, absorbs heat from the high-temperature and high-pressure refrigerant gas, the temperature rises, and is subsequently discharged; the air intake on the evaporator 4 side passes through the blower 6, so that the air passes through the air channel of the evaporator 4, is cooled and then blown into the vehicle.

[0053] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting, It is characterized in that The control method for automobile refrigeration system includes the following steps: S1, when the refrigeration system enters the rapid cooling mode, the speed of the compressor (1) is increased to the maximum for cooling, and the evaporator (4) is allowed to frost during cooling, and the evaporation temperature is lower than 0°C; S2, when the evaporator (4) is frosted to a set degree, the compressor (1) is decelerated to raise the evaporation temperature back to 0°C, and the speed is kept unchanged, so that the evaporator (4) begins to defrost; S3, when the defrosting of the evaporator (4) is completed and the evaporation temperature is higher than 0°C, it is determined whether the temperature of the vehicle passenger compartment has reached a set value. If it has not reached the set value, the compressor (1) is continuously accelerated to the maximum speed, and S1 and S2 are repeated until the temperature of the vehicle passenger compartment reaches the set value, and the vehicle refrigeration system is switched to normal control.

2. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 1, It is characterized in that The evaporation temperature is detected and acquired by a first temperature sensor.

3. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 1, It is characterized in that The vehicle passenger compartment temperature is detected and acquired by a second temperature sensor.

4. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 1, It is characterized in that The degree of frosting and defrosting of the evaporator (4) is determined by the evaporation temperature, and the defrosting method of the evaporator (4) is that the evaporator (4) exchanges heat with the air.

5. The vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 1, It is characterized in that The automobile refrigeration system includes a refrigerant circuit and an air flow path.

6. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 5, It is characterized in that The refrigerant circuit comprises a compressor (1), a condenser (2), a throttle valve (3), an evaporator (4), and a refrigerant channel; The exhaust port of the compressor (1) is connected to the condenser (2), the inlet of the compressor (1) is connected to the evaporator (4), the throttle valve (3) is arranged between the outlet of the condenser (2) and the inlet of the evaporator (4), and the compressor (1), the condenser (2), the throttle valve (3) and the evaporator (4) are connected in sequence by a refrigerant channel.

7. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 5, It is characterized in that The refrigerant circulation process of the refrigeration system is as follows: the high-temperature and high-pressure refrigerant gas discharged from the exhaust port of the compressor (1) enters the refrigerant channel of the condenser (2), releases heat to the air, and condenses into a high-temperature and high-pressure refrigerant liquid; the liquid refrigerant enters the throttle valve (3), is throttled to become a low-temperature and low-pressure two-phase flow; the low-temperature and low-pressure two-phase flow enters the refrigerant channel of the evaporator (4), evaporates by heat exchange with the air, and finally evaporates into a low-temperature and low-pressure refrigerant gas; the low-temperature and low-pressure refrigerant gas flows into the compressor (1) and is compressed into a high-temperature and high-pressure gas, thus forming a refrigerant circulation.

8. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 7, It is characterized in that The throttle valve (3) is an electronic expansion valve.

9. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 5, It is characterized in that The air flow path includes a cooling fan (5), a blower (6), and an air channel; The cooling fan (5) is arranged between the condenser (2) and the evaporator (4), and the blower (6) is arranged on the other side of the evaporator (4). The condenser (2), the cooling fan (5), the evaporator (4) and the blower (6) are connected in sequence by an air passage.

10. A vehicle passenger compartment rapid cooling control method based on frosting and defrosting according to claim 5, It is characterized in that The air processing process of the refrigeration system is as follows: the air inlet on the condenser (2) side passes through the cooling fan (5), so that the air passes through the air channel of the condenser (2), absorbs heat from the high-temperature and high-pressure refrigerant gas, increases the temperature, and is subsequently discharged; the air inlet on the evaporator (4) side passes through the blower (6), so that the air passes through the air channel of the evaporator (4), is cooled, and then blown into the vehicle.

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