Method and device for determining control logic of electric vehicle and its heat pump air conditioning system

Abstract

The present invention discloses a method and a device for determining a control logic of an electric vehicle and its heat pump air conditioning system; wherein the heat pump air conditioning system includes a blower, a compressor and a cooling fan, the heat pump air conditioning system has N gears, N≥2 and is an integer; the determination method includes: obtaining the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility corresponding to each gear; starting the blower, the compressor and the cooling fan, and adjusting the blower, the compressor and the cooling fan based on the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility to obtain the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear; determining the control strategy of the heat pump air conditioning at each gear based on the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear. The above determination method enables the rotational speeds of the blower, the compressor and the cooling fan to be reasonably matched at each gear, improving the sound quality of the whole vehicle.

Description

Technical Field

[0001] This application relates to the technical field of electric vehicles, and in particular to an electric vehicle and a method and device for determining the control logic of its heat pump air conditioning system. Background Art

[0002] For the on-vehicle air conditioner of the air conditioning system of traditional fuel vehicles, its heating principle is to recover the waste heat of the engine. Therefore, only when the waste heat output of the engine is relatively high can the purpose of heat exchange with the interior of the vehicle be achieved. This principle results in the inability to quickly increase the interior temperature when the vehicle starts in winter, and the temperature may even rise after more than ten minutes. Currently, the on-vehicle air conditioning system commonly used in electric vehicles is a PTC (Positive Temperature Coefficient) heating air conditioner, which uses a thermistor ceramic element as the heat source and an alloy metal as the radiator, directly obtaining the heat source through the high voltage of the battery pack and directly converting electrical energy into heat energy. Its heating principle leads to a very high power consumption during heating, affecting the cruising range of electric vehicles.

[0003] With the development of technology, electric vehicles are increasingly using heat pump air conditioning systems. The heat pump air conditioning system avoids the disadvantages of the above two types of air conditioners. By simultaneously operating the compressor, blower, and cooling fan, it obtains energy from the outdoor air through the refrigerant and transfers it to the interior of the vehicle, thus solving the problems of slow temperature rise of the fuel vehicle air conditioner and high power consumption of the PTC air conditioner. However, while improving the heating efficiency and reducing energy consumption, the heat pump air conditioning system also brings new problems: it is prone to generating greater noise, reducing the NVH (Noise, Vibration, Harshness) performance of the whole vehicle. Summary of the Invention

[0004] The present invention provides an electric vehicle and a method and device for determining the control logic of its heat pump air conditioning system to solve or partially solve the technical problem that the heat pump air conditioning system is prone to generating greater noise during operation.

[0005] To solve the above technical problem, according to an embodiment of the present invention, a method for determining the control logic of a heat pump air conditioning system of an electric vehicle is provided. The heat pump air conditioning system includes a blower, a compressor, and a cooling fan. The heat pump air conditioning system includes N gears, where N≥2 and N is an integer. The determination method includes:

[0006] Obtaining the target sound pressure level inside the vehicle and the target speech intelligibility inside the vehicle corresponding to each gear;

[0007] Start the blower, the compressor and the cooling fan, and adjust the blower, the compressor and the cooling fan based on the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility to obtain the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear;

[0008] Based on the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear, determine the control strategy of the heat pump air conditioner in each gear.

[0009] Optionally, the adjusting the blower, the compressor and the cooling fan based on the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility to obtain the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear includes:

[0010] For the current gear, start and adjust the blower to obtain the first in-vehicle detected sound pressure level and the first in-vehicle detected speech intelligibility; when the first in-vehicle detected sound pressure level reaches the in-vehicle set sound pressure level corresponding to the current gear and the first in-vehicle detected speech intelligibility is higher than the in-vehicle target speech intelligibility corresponding to the current gear, obtain the first current rotational speed of the blower, the first current in-vehicle sound pressure level and the first current in-vehicle speech intelligibility; the in-vehicle set sound pressure level is lower than the in-vehicle target sound pressure level;

[0011] Keep the blower at the first current rotational speed, start and adjust the compressor and the cooling fan to obtain the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility; on the premise that the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility meet the first set condition, determine the maximum rotational speed of the compressor and the maximum rotational speed of the cooling fan;

[0012] Determine the target rotational speed of the blower according to the first current rotational speed, determine the critical rotational speed of the compressor according to the maximum rotational speed of the compressor, and determine the critical rotational speed of the cooling fan according to the maximum rotational speed of the cooling fan;

[0013] Wherein, the first set condition includes: the difference between the second in-vehicle detected sound pressure level and the first current in-vehicle sound pressure level does not exceed the in-vehicle sound pressure level threshold, and the difference between the first current in-vehicle speech intelligibility and the second in-vehicle detected speech intelligibility does not exceed the in-vehicle speech intelligibility threshold.

[0014] Optionally, the heat pump air conditioning system further includes a PTC heater;

[0015] Determining the target speed of the blower according to the first current speed, determining the critical speed of the compressor according to the maximum speed of the compressor, and determining the critical speed of the cooling fan according to the maximum speed of the cooling fan includes:

[0016] Adjusting the blower, the compressor, the cooling fan and the PTC heater on the premise of meeting the second set condition, and obtaining the power of the blower, the power of the compressor, the power of the cooling fan and the power of the PTC heater; when the sum of the power of the blower, the power of the compressor, the power of the cooling fan and the power of the PTC heater is the smallest, obtaining the second current speed of the blower, the current speed of the compressor, and the current speed of the cooling fan;

[0017] Taking the second current speed as the target speed of the blower, taking the current speed of the compressor as the critical speed of the compressor, and taking the current speed of the cooling fan as the critical speed of the cooling fan;

[0018] Wherein, the second set condition includes: starting the blower, the compressor, the cooling fan and the PTC heater at a preset ambient temperature so that the vehicle interior temperature reaches the set temperature, and satisfying that the blower speed does not exceed the first current speed, the compressor speed does not exceed the maximum speed of the compressor, and the cooling fan speed does not exceed the maximum speed of the cooling fan.

[0019] Optionally, the set temperature is 22°C to 25°C.

[0020] Optionally, the preset ambient temperature is -15°C to -10°C.

[0021] Optionally, the vehicle interior sound pressure level threshold is the difference between the target vehicle interior sound pressure level and the set vehicle interior sound pressure level at the current gear.

[0022] Optionally, before starting the blower, the compressor and the cooling fan, the determination method further includes:

[0023] Obtaining the target vehicle exterior sound pressure level and the target vehicle exterior speech intelligibility;

[0024] Adjusting the blower, the compressor and the cooling fan based on the target vehicle interior sound pressure level and the target vehicle interior speech intelligibility, and obtaining the target speed of the blower, the critical speed of the compressor and the critical speed of the cooling fan corresponding to each gear, includes:

[0025] Adjust the blower, the compressor, and the cooling fan based on the in-vehicle target sound pressure level, the in-vehicle target speech intelligibility, the out-vehicle target sound pressure level, and the out-vehicle target speech intelligibility, and obtain the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan corresponding to each gear.

[0026] Based on the same inventive concept, according to an embodiment of the present invention, there is provided a device for determining the control logic of a heat pump air conditioning system for an electric vehicle. The heat pump air conditioning system includes a blower, a compressor, and a cooling fan. The heat pump air conditioning system has N gears, where N≥2 and is an integer. The determining device includes:

[0027] An acquisition module, configured to obtain the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility corresponding to each gear.

[0028] An adjustment module, configured to start the blower, the compressor, and the cooling fan, and adjust the blower, the compressor, and the cooling fan based on the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility, and obtain the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan corresponding to each gear.

[0029] A determination module, configured to determine the control strategy of the heat pump air conditioning at each gear based on the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan corresponding to each gear.

[0030] Based on the same inventive concept, according to an embodiment of the present invention, there is also provided a controller. The controller includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of any one of the foregoing determination methods are implemented.

[0031] Based on the same inventive concept, according to an embodiment of the present invention, there is also provided an electric vehicle. The control logic of the heat pump air conditioning system of the electric vehicle is obtained by any one of the foregoing determination methods.

[0032] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0033] The present invention provides a method for determining the control logic of an electric vehicle heat pump air conditioning system. Based on the predetermined target sound pressure level inside the vehicle and the target speech intelligibility that the heat pump air conditioning needs to meet in each gear, the blower, compressor, and cooling fan of the heat pump air conditioning are adjusted simultaneously to obtain the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan corresponding to each gear. Based on the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan, the control strategy of the heat pump air conditioning in each gear is determined. Since the influence of the rotational speeds of the blower, compressor, and cooling fan on the vehicle noise is considered simultaneously, the rotational speeds of the blower, compressor, and cooling fan in each gear can be reasonably matched, meeting the requirements of the sound pressure level of the vehicle interior noise and the speech intelligibility on the premise of ensuring heating comfort in each gear, and improving the sound quality of the whole vehicle.

[0034] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following specifically illustrates the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0036] In the drawings:

[0037] Figure 1 A flowchart showing the method for determining the control logic of an electric vehicle heat pump air conditioning system according to an embodiment of the present invention;

[0038] Figure 2 A flowchart showing the method for adjusting the blower, compressor, and cooling fan according to an embodiment of the present invention;

[0039] Figure 3 The steering wheel vibration data of the blower at different rotational speeds according to an embodiment of the present invention;

[0040] Figure 4 A schematic diagram showing the device for determining the control logic of an electric vehicle heat pump air conditioning system according to an embodiment of the present invention

[0041] Figure 5 A schematic diagram showing the controller according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] To enable those skilled in the art to which this application pertains to more clearly understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and through specific embodiments. Throughout this specification, unless otherwise specifically stated, the terms used herein should be understood to have the meanings as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as the general understanding of those skilled in the art to which this invention pertains. In case of any contradiction, this specification shall prevail. Unless otherwise specifically stated, various devices used in this invention can be obtained through market purchase or prepared by existing methods.

[0043] To reduce the noise problem generated by the heat pump air conditioning system in an electric vehicle, the present invention provides a method for determining the control logic of a heat pump air conditioning system, wherein the heat pump air conditioning system includes a blower, a compressor, and a cooling fan, and the heat pump air conditioning system has N gears, where N≥2 and is an integer; the overall idea of the determination method is as follows:

[0044] Obtain the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility corresponding to each gear; start the blower, the compressor, and the cooling fan, and adjust the blower, the compressor, and the cooling fan based on the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility to obtain the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan corresponding to each gear; based on the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan corresponding to each gear, determine the control strategy of the heat pump air conditioner in each gear.

[0045] The principle by which the above determination method can reduce noise is as follows: The above method simultaneously considers the influence of the rotational speeds of the blower, the compressor, and the cooling fan on the overall vehicle noise, enabling the rotational speeds of the blower, the compressor, and the cooling fan to be reasonably matched in each gear, meeting the requirements of the in-vehicle noise sound pressure level and the speech intelligibility while ensuring comfort in each gear for heating, and improving the sound quality of the overall vehicle.

[0046] Next, the above solution will be further described in conjunction with embodiments.

[0047] In an optional embodiment, the above determination method is applied to the heat pump air conditioning system of a certain electric vehicle model. The heat pump air conditioning system includes a blower, a compressor, a cooling fan, and a PTC heater, and can provide multiple selectable gears for users. Among them, the cooling fan belongs to an external heat exchange component. When the cooling fan operates, it drives the air outside the vehicle to blow through the external heat exchanger for heat exchange. The external heat exchanger can be an evaporator or a condenser. The blower belongs to an internal heat exchange component, and the internal heat exchange component is used for heat exchange with the air inside the vehicle occupant compartment. Specifically, the blower drives the air inside the occupant compartment to blow through the internal heat exchanger for heat exchange.

[0048] The determination method is asFigure 1 As shown, it includes steps S1 to S3, specifically as follows:

[0049] S1: Obtain the target in-vehicle sound pressure level and the target in-vehicle speech intelligibility corresponding to each gear;

[0050] Specifically, according to the noise requirements to be achieved by the vehicle, pre-determine the target in-vehicle sound pressure level and the target in-vehicle speech intelligibility of the heat pump air conditioner in each gear and store them. Among them, the sound pressure level is used to measure the size of the noise, expressed in dB: decibels. The larger the sound pressure level value, the louder the sound. Speech intelligibility, also known as language intelligibility, refers to the incoherent speech units pronounced by one or several speakers and determined by one or several listeners through the communication system, measured in percentage. In the embodiments of the invention, the larger the percentage value of speech intelligibility, the clearer the sound. On the contrary, the smaller the value, the less distinguishable the sound.

[0051] For the determination of the target in-vehicle sound pressure level and the in-vehicle speech intelligibility, the scenario of the vehicle being static and under high voltage, that is, when the vehicle speed is 0 and the heat pump air conditioner is turned on, can be considered. The sound pressure level of the noise does not exceed the comfortable range that the human body can bear, and the in-vehicle speech is clear and distinguishable, without affecting the normal communication of the in-vehicle personnel. Considering that the heat pump air conditioner provides multiple adjustable gears for the user, as the gear increases, the power of the blower, compressor and cooling fan becomes larger. Therefore, the target in-vehicle sound pressure level index gradually increases, and the target in-vehicle speech intelligibility index gradually decreases.

[0052] To further improve the NVH performance of the whole vehicle, it is also necessary to evaluate the out-of-vehicle sound pressure level and the out-of-vehicle speech intelligibility. Therefore, optionally, the target out-of-vehicle sound pressure level and the target out-of-vehicle speech intelligibility corresponding to each gear can also be obtained.

[0053] S2: Start the blower, the compressor and the cooling fan, and adjust the blower, the compressor and the cooling fan based on the target in-vehicle sound pressure level and the target in-vehicle speech intelligibility to obtain the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear;

[0054] Specifically, in this step, based on the target sound pressure level inside the vehicle and the target speech intelligibility inside the vehicle corresponding to each gear, the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan of the heat pump air conditioner are sequentially determined for each gear: i.e., the first gear, the second gear, the third gear, ……, the Nth gear. Among them, the target rotational speed of the blower is the operating rotational speed when the blower works in the current gear, and the target rotational speed of the blower also reflects the air supply volume of the heat pump air conditioner in the current gear; while the critical rotational speed of the compressor is the maximum rotational speed allowed for the compressor in the current gear, and the critical rotational speed of the cooling fan is the maximum rotational speed allowed for the cooling fan in the current gear. In this embodiment, the target rotational speed of the blower, the critical rotational speed of the compressor, and the critical rotational speed of the cooling fan are adjusted under the limitation of the target sound pressure level inside the vehicle and the target speech intelligibility inside the vehicle.

[0055] An optional adjustment scheme is as Figure 2 shown, including S21 to S23, specifically as follows:

[0056] S21: For the current gear, start and adjust the blower to obtain the first detected sound pressure level inside the vehicle and the first detected speech intelligibility inside the vehicle; when the first detected sound pressure level inside the vehicle reaches the set sound pressure level inside the vehicle corresponding to the current gear, and the first detected speech intelligibility inside the vehicle is higher than the target speech intelligibility inside the vehicle corresponding to the current gear, obtain the first current rotational speed of the blower, the first current sound pressure level inside the vehicle, and the first current speech intelligibility inside the vehicle; the set sound pressure level inside the vehicle is lower than the target sound pressure level inside the vehicle;

[0057] That is, in this step, the blower is first separately started and adjusted, and the first detected sound pressure level inside the vehicle and the first detected speech intelligibility inside the vehicle during the adjustment process are collected in real time. When adjusting the rotational speed of the blower to make the first detected sound pressure level inside the vehicle reach the set sound pressure level inside the vehicle, the actual rotational speed of the blower at this time, that is, the first current rotational speed, is obtained, with the unit of rpm (revolutions per minute). Since the blower is started separately, the set sound pressure level inside the vehicle should be lower than the target sound pressure level inside the vehicle in the current gear, so as to reserve sound pressure level space for subsequent simultaneous startup of the blower, compressor, and cooling fan.

[0058] Optionally, when adjusting the blower, the influence of the air supply volume of each gear of the air conditioner should also be considered to ensure that the first current rotational speed of the blower is not lower than the minimum air supply volume in the current gear.

[0059] Both the sound pressure level inside the vehicle and the target speech intelligibility inside the vehicle can be obtained through commercially available microphones and supporting sound recognition processing software. During the test, the microphone is arranged in the inner ear of the driver or the test member, and then the blower is started. The microphone collects the sound signal, and through software processing, the first detected sound pressure level inside the vehicle and the first detected speech intelligibility inside the vehicle can be obtained simultaneously. The first detected sound pressure level inside the vehicle and the first detected speech intelligibility inside the vehicle reflect the noise situation inside the vehicle after the blower is started separately.

[0060] After determining the first current speed of the blower, the next step is to adjust the compressor and the cooling fan, specifically as follows:

[0061] S22: Keep the blower at the first current speed, start and adjust the compressor and the cooling fan to obtain the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility; on the premise that the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility meet the first set condition, determine the maximum speed of the compressor and the maximum speed of the cooling fan;

[0062] Specifically, maintain the blower working at the first current speed, start the compressor and the cooling fan and collect the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility in real time, and adjust the speeds of the compressor and the cooling fan on the premise of meeting the first set condition. Therefore, the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility are the noise sound pressure level and speech intelligibility corresponding to the simultaneous operation of the blower, the compressor and the cooling fan.

[0063] Among them, the first set condition includes 1) and 2), specifically as follows:

[0064] 1) The difference between the second in-vehicle detected sound pressure level and the first in-vehicle current sound pressure level does not exceed the in-vehicle sound pressure level threshold, that is:

[0065] dB 2内 -dB 1内 ≤dB 0内 (1)

[0066] Among them, dB 1内 is the first in-vehicle current sound pressure level, dB 2内 is the second in-vehicle detected sound pressure level, dB 0内 is the in-vehicle sound pressure level threshold.

[0067] Among them, dB 0内 is related to the gear and can be determined according to the difference between the in-vehicle target sound pressure level and the in-vehicle set sound pressure level at the current gear. The purpose is to avoid the second in-vehicle detected sound pressure level exceeding the in-vehicle target sound pressure level and the second in-vehicle detected speech intelligibility being lower than the in-vehicle target speech intelligibility after simultaneously turning on the blower, the compressor and the cooling fan.

[0068] 2) The difference between the first in-vehicle current speech intelligibility and the second in-vehicle detected speech intelligibility does not exceed the in-vehicle speech intelligibility threshold, that is:

[0069] S 1内 -S 2内 ≤S 0内 (2)

[0070] Among them, S 1内 is the current speech clarity in the first vehicle compartment, S 2内 is the detected speech clarity in the second vehicle compartment, and S 0内 is the speech clarity threshold in the vehicle compartment.

[0071] Optionally, the selectable value range of the speech clarity threshold S 0内 is 1% - 3%, preferably 1%.

[0072] Generally speaking, in this step, while keeping the blower working at the first current speed and satisfying equations (1) and (2), the compressor and the cooling fan are adjusted to find the maximum speed Y1 of the compressor and the maximum speed Z1 of the cooling fan that meet the above prerequisites and conditions, with the unit of rpm.

[0073] After obtaining the first current speed of the blower, the maximum speed of the compressor, and the maximum speed of the cooling fan, next:

[0074] S23: Determine the target speed of the blower according to the first current speed, determine the critical speed of the compressor according to the maximum speed of the compressor, and determine the critical speed of the cooling fan according to the maximum speed of the cooling fan.

[0075] An optional solution is to directly use the first current speed X1 as the target speed of the blower, the maximum speed Y1 of the compressor as the critical speed of the compressor, and the maximum speed Z1 of the cooling fan as the critical speed of the cooling fan, so as to determine the control strategies of the blower, the compressor, and the cooling fan at each gear position.

[0076] Another optional solution is to make the target speed of the blower slightly lower than the first current speed, then use a correction coefficient to correct the maximum speed of the compressor respectively, and use the corrected value as the critical speed of the compressor; use another correction coefficient to correct the maximum speed of the cooling fan, and use the corrected value as the critical speed of the cooling fan.

[0077] It should be noted that it is also necessary to judge the sound pressure level and speech clarity outside the vehicle after the heat pump air conditioner is turned on. The purpose is that the noise will not cause discomfort to the people outside the vehicle and will not overly interfere with the normal communication between the people inside the vehicle and the people outside the vehicle.

[0078] Therefore, in some optional embodiments, when performing step S1, the target sound pressure level outside the vehicle: dB 0外 and the target speech clarity S 0外 outside the vehicle can also be obtained.

[0079] At this time, step S2 is correspondingly adjusted to:

[0080] For the current gear position, start and adjust the blower to obtain the first in-vehicle detected sound pressure level, the first out-of-vehicle detected sound pressure level, the first in-vehicle detected speech intelligibility, and the first out-of-vehicle detected speech intelligibility; when the first in-vehicle detected sound pressure level reaches the in-vehicle set sound pressure level corresponding to the current gear position and the first in-vehicle detected speech intelligibility is higher than the in-vehicle target speech intelligibility corresponding to the current gear position, obtain the first current speed of the blower, the first current in-vehicle sound pressure level dB 1内 , the first current in-vehicle speech intelligibility S 1内 , the first current out-of-vehicle sound pressure level dB 1外 and the first current out-of-vehicle speech intelligibility S 1外 ; the in-vehicle set sound pressure level is lower than the in-vehicle target sound pressure level;

[0081] Keep the blower at the first current speed, start and adjust the compressor and the cooling fan to obtain the second in-vehicle detected sound pressure level dB 2内 , the second in-vehicle detected speech intelligibility S 2内 , the second out-of-vehicle detected sound pressure level dB 2外 and the second out-of-vehicle detected speech intelligibility S 2外 ; on the premise that the second in-vehicle detected sound pressure level dB 2内 , the second in-vehicle detected speech intelligibility S 2内 , the second out-of-vehicle detected sound pressure level dB 2外 and the second out-of-vehicle detected speech intelligibility S 2外 meet the third set condition, determine the maximum speed Y1 of the compressor and the maximum speed Z1 of the cooling fan;

[0082] Wherein, the third set condition includes:

[0083] dB 2内 -dB 1内 ≤dB 0内 (3)

[0084] S 1内 -S 2内 ≤S 0内 (4)

[0085] dB 2外 -dB 1外 ≤dB 0外 (5)

[0086] S 1外 -S 2外 ≤S 0外 (6)

[0087] In the above formula, dB 0外 is the out-of-vehicle sound pressure level threshold, and S 0外 is the out-of-vehicle speech intelligibility threshold. dB0外 The value can be the same as dB 0内 or can be determined according to the difference between the external target sound pressure level and the external set sound pressure level; S 0外 The selectable value range of is 1% to 3%, preferably 1%.

[0088] The sound pressure level and speech intelligibility data outside the vehicle can be obtained by collecting signals through a microphone set outside the vehicle and processing them through a supporting sound recognition and processing software. The microphone outside the vehicle can be set at a fixed position directly in front of the vehicle and at a certain height from the ground to simulate the listening environment of people outside the vehicle.

[0089] S3: Based on the blower target speed, compressor critical speed, and cooling fan critical speed corresponding to each gear, determine the control strategy of the heat pump air conditioner in each gear.

[0090] An optional solution for determining the control strategy of the heat pump air conditioner in each gear based on the blower target speed, compressor critical speed, and cooling fan critical speed corresponding to each gear is as follows:

[0091] Take the blower target speed as the blower rated speed of the current gear;

[0092] According to the compressor critical speed, determine the compressor output power range in the current gear;

[0093] According to the cooling fan critical speed, determine the cooling fan speed range in the current gear.

[0094] Specifically, the compressor critical speed corresponds to the maximum output power of the compressor in the current gear. At the same time, combined with production experience and test calibration, the minimum output power of the compressor can be pre-determined in the current gear. The two are combined to obtain the compressor output power range in the current gear.

[0095] Similarly, the cooling fan critical speed corresponds to the maximum output power of the cooling fan in the current gear. At the same time, combined with production experience and test calibration, a minimum cooling fan speed can be pre-determined in the current gear. The two are combined to obtain the cooling fan speed range in the current gear.

[0096] It should be noted that for the heat pump air conditioner gears greater than or equal to the second gear, the above method can be directly used to determine the control strategy of each gear; but for the first gear of the heat pump air conditioner, considering that it not only needs to meet the noise requirements but also ensure the heating demand of the occupants in common low-temperature environments, in some alternative embodiments, after obtaining the first current speed, the maximum compressor speed, and the maximum cooling fan speed, the following method is also required for further adjustment:

[0097] On the premise of meeting the second set condition, adjust the blower, the compressor, the cooling fan, and the PTC heater, and obtain the blower power, the compressor power, the cooling fan power, and the PTC heater power; when the sum of the blower power, the compressor power, the cooling fan power, and the PTC heater power is minimized, obtain the second current speed of the blower, the current speed of the compressor, and the current speed of the cooling fan; use the second current speed as the target speed of the blower, use the current speed of the compressor as the critical speed of the compressor, and use the current speed of the cooling fan as the critical speed of the cooling fan.

[0098] Among them, the second set condition includes:

[0099] 1) Start the blower, the compressor, the cooling fan, and the PTC heater at a preset ambient temperature so that the vehicle interior temperature reaches the set temperature;

[0100] 2) The blower speed does not exceed the first current speed;

[0101] 3) The compressor speed does not exceed the maximum speed of the compressor;

[0102] 4) The cooling fan speed does not exceed the maximum speed of the cooling fan.

[0103] Specifically, the above solution is to adjust the blower speed, the compressor speed, and the cooling fan speed on the premise of meeting the requirements that the actual speed of the blower does not exceed the first current speed X1 corresponding to the first gear, the actual speed of the compressor does not exceed the maximum speed Y1 of the compressor corresponding to the first gear, the actual speed of the cooling fan does not exceed the maximum speed Z1 of the cooling fan corresponding to the first gear, and the vehicle interior temperature can reach the set temperature when the heat pump air conditioner is started in a low-temperature environment of the preset ambient temperature, and monitor the blower power P1, the compressor power P2, the cooling fan power P3, and the PTC heater power P4, and adjust with the minimum value of P1 + P2 + P3 + P4 as the target. Among them, the preset ambient temperature is determined according to actual needs. For most driving environments, its value range is -15°C to -10°C; this ambient temperature can be obtained in the low-temperature environmental test chamber of the vehicle. The set temperature is determined according to the human comfort temperature or the human comfort breathing point temperature, such as 22°C to 25°C.

[0104] Therefore, the control logic of the first gear of the heat pump air conditioner is to determine the target speed of the blower, the critical speed of the compressor, and the critical speed of the cooling fan under the requirements of meeting the noise requirements, the vehicle interior occupant compartment temperature can be quickly raised to the human comfort temperature when the air conditioner is turned on in the first gear in the preset low-temperature environment, and the power consumption is as small as possible.

[0105] To more intuitively illustrate the above solution, in the following embodiment, it will be described in combination with specific data and specific implementation manners.

[0106] (1) The system device includes:

[0107] An electric vehicle; a blower control system, a compressor control system, and a PTC heater control system integrated in the heat pump air-conditioning controller of the electric vehicle; a vehicle controller VCU integrated with a cooling fan control system in the front engine compartment; a noise data acquisition unit, two microphones, and a microphone fixing bracket; a vibration sensor; a computer and supporting software capable of processing sound and vibration data.

[0108] (2) The arrangement method of the system device is as follows:

[0109] Connect the positive and negative poles of the regulated power supply to the positive and negative ends of the wire harness interface of the air suspension air pump of the electric vehicle. Arrange one of the two microphones at a height of 1 m above the ground 1 m in front of the vehicle, and arrange the other microphone at the inner ear of the driver at the front row in the vehicle. Connect the output ends of the two microphones to the input end of the noise data acquisition unit, and connect the input end of the computer to the output end of the noise data acquisition unit to form a noise test system; through the compressor, blower, and PTC heater control software integrated in the air-conditioning controller and the cooling fan control software integrated in the VCU, a control system is formed, and this control system can make the compressor, blower, fan, and PTC heater work according to their instructions. The noise test system and the control system form a complete logical verification system to output the air-conditioning system control logic beneficial to the in-vehicle and out-of-vehicle sound quality of pure electric vehicles.

[0110] (3) Overview of the test process:

[0111] When the environmental temperature is -10°C to -12°C and the heat pump heating condition is started, the compressor, blower, cooling fan, and PTC are respectively powered by high-voltage or low-voltage electricity through the air-conditioning controller and VCU. Noise tests are carried out under different rotational speed conditions of the blower, compressor, and cooling fan. The noise sound pressure levels and speech intelligibility data inside and outside the vehicle can be directly and quickly obtained through objective tests; by matching the set targets of the noise sound pressure levels and speech intelligibility with the test results, the control logics of the blower, compressor, and cooling fan are adjusted in detail and determined, and the running noise size and sound quality of the air-conditioning system can be comprehensively analyzed, and it can also guide the rapid locking of the air-conditioning software logic design scheme.

[0112] It should be noted that the determination principles for the target sound pressure level and target speech intelligibility inside and outside the vehicle are as follows: The air volume of the air conditioner is smoothly changed from gear 1 to gear 7. Adjusting the air volume increase switch provides a comfortable experience for passengers, avoiding reducing the psychological expectation due to noise. The air volume of the heat pump air conditioner in gear 7 provides a rapid heating experience for passengers, but it is necessary to meet the principle that the maximum noise sound pressure level inside the vehicle ≤ 60 dB(A).

[0113] (4) Description of the test process:

[0114] Taking the in-vehicle noise as an example, for the first gear of the heat pump air conditioner, the target sound pressure level inside the vehicle is 38 dB, that is, it is required that the in-vehicle noise generated by the first gear of the air conditioner does not exceed 38 dB(A), and the target speech intelligibility inside the vehicle is 99%. Considering the use scenario with relatively high noise such as air-conditioning heating on the basis of the noise requirement, when the in-vehicle temperature rises to the temperature required by the in-vehicle personnel, the automatic air-conditioning software will automatically reduce the air-conditioning gear to the lowest gear that can maintain the temperature balance. For a manual air conditioner, usually when the in-vehicle personnel feel that the temperature is relatively high, they will also manually reduce the air-conditioning gear to the lowest gear that can maintain the temperature balance. The consideration factor for setting the rotational speed of the blower in gear 1 is that when the vehicle speed is 0 (static high voltage) and the air conditioner is turned on, it should be ≤ 38 dB(A). Initially, the rotational speed of the blower in gear 1, X1 rpm = 1200 rpm, is adjusted so that the in-vehicle noise sound pressure level when the blower operates alone is 37 dB(A) at the set sound pressure level inside the vehicle. Next, the rotational speed of the compressor and the rotational speed of the cooling fan are adjusted to ensure that the in-vehicle noise sound pressure level when the cooling fan, compressor, and blower operate simultaneously - the in-vehicle noise sound pressure level when the blower operates alone ≤ 1 dB(A); the in-vehicle speech intelligibility when the blower operates alone - the in-vehicle speech intelligibility when the fan, compressor, and blower operate simultaneously ≤ 1%. The maximum rotational speed of the compressor is locked at Y1 rpm, and the maximum rotational speed of the fan is locked at Z1 rpm. In the environmental chamber, the ambient temperature inside the chamber is set to -10°C. At this time, the compressor and the fan are operated to ensure that the temperature of the radiator core can be maintained at 25°C at the driver's breathing point. At the same time, the total power of the heating components, P = P1 (blower power) + P2 (compressor power) + P3 (fan power) + P4 (PTC power), is calculated. When P is adjusted to the minimum value, for a certain vehicle model, locking the rotational speed of the blower at 1000 rpm < X1 rpm, the rotational speed of the compressor at 1500 rpm, and the rotational speed of the fan at 1200 rpm can meet the requirement of maintaining the driver's breathing point at 25°C, and at this time, the in-vehicle noise is only 35 dB(A). That is, it is adjusted and confirmed that the in-vehicle noise when the heat pump air conditioner is turned on in gear 1 does not exceed 35 dB(A), and its minimum energy consumption is reduced. Based on this, the heating control logic of the heat pump air conditioner system for this vehicle model in gear 1 is determined.

[0115] For the second to seventh gears, the noise factor is mainly considered: when the high voltage is static, that is, when the vehicle speed is 0 and the air conditioner is turned on in any one of the second to seventh gears, the noise sound pressure level and speech intelligibility meet the expectations. The determination method is the same as that in the first gear to meet the requirements: the in-vehicle noise sound pressure level when the cooling fan, compressor, and blower are running simultaneously - the in-vehicle noise sound pressure level when the blower is running alone ≤ 1 dB(A); the in-vehicle speech intelligibility when the blower is running alone - the in-vehicle speech intelligibility when the fan, compressor, and blower are running simultaneously ≤ 1%.

[0116] Through the above scheme, the target speeds of the blower, the critical speeds of the compressor, and the critical speeds of the cooling fan for the first to seventh gears are determined as shown in Table 1:

[0117] Table 1: Target speeds of the blower, critical speeds of the compressor, and critical speeds of the cooling fan

[0118]

[0119] Based on Table 1, combined with the minimum output power of the compressor and the minimum speed of the cooling fan in each gear, the control logic of the heat pump air conditioner shown in Table 2 can be obtained:

[0120] Table 2: Control logic of the heat pump air conditioning system

[0121]

[0122] Among them, when determining the blower speed in Table 2, the vibration problem in NVH is also considered. Because the blower of the heat pump air conditioning system is installed on the co-pilot side of the vehicle instrument panel crossbeam, and at the same time the steering wheel is fixed on the driver side of the instrument panel crossbeam, its structure determines that the blower speed frequency will be coupled with the steering wheel mode and cause resonance. Therefore, the fixed speeds of each gear of the blower need to be considered to avoid the steering wheel resonance area to prevent the steering wheel resonance and bring a very poor driving experience.

[0123] Figure 3 The steering wheel vibration data of the blower at different speeds is shown. When the blower is in the foot-blowing mode and the face-blowing mode, when the blower speed is between 2500 - 2900 rpm, the steering wheel vibration amplitude appears at a peak, especially when the blower speed is 2700 rpm, it is the largest. Therefore, this speed range should be avoided when determining the blower speed. Finally, the target speed of the blower in the seventh gear is determined to be 3000 rpm, and the target speed of the blower in the sixth gear is 2500 rpm to reduce the vibration of the steering wheel.

[0124] The determination scheme of the control logic of the heat pump air conditioner provided in this embodiment has the following characteristics:

[0125] 1) The matching of the blower, compressor, fan speed, and PTC power is reasonable, and the heating comfort and sound quality in each gear are excellent;

[0126] 2) Combine the noise requirements and the demand for the in-vehicle temperature to reach a comfortable level for the human body under low-temperature driving conditions with minimal power consumption to determine the first gear control logic of the heat pump air conditioner; at the same time, the low gears (1-4 gears) of the blower are the common operating conditions of the air conditioner, and the PTC control power is relatively low, less than 500W. Most of the power is achieved by the relatively high-efficiency compressor refrigerant. This control strategy can significantly reduce the overall power consumption of the vehicle.

[0127] 3) The in-vehicle and out-of-vehicle noise rises smoothly from 1 to 7 gears, and adjusting the air volume + switch gives passengers a comfortable noise increase to meet their psychological expectations.

[0128] 4) Compared with the conventional method for determining the air conditioner control logic, it can avoid repeatedly programming the air conditioner control software through the "trial method" to solve the noise and vibration problems of the air conditioner system, saving time and cost for the development of the heat pump air conditioner system.

[0129] The solution provided by the embodiment of the present invention is particularly suitable for new energy vehicles equipped with a heat pump system. When the ambient temperature in winter is above -10°C, it is beneficial for the development of the air conditioner controller software logic for in-vehicle and out-of-vehicle sounds under heating conditions; using the test system, under any speed adjustment of the compressor, blower, and fan, and collecting the sound signals of the microphone at different speeds, the control logic is designed based on the sound signals.

[0130] Based on the same inventive concept as the foregoing embodiments, in another optional embodiment, as Figure 4 shown, a device for determining the control logic of an electric vehicle heat pump air conditioner system is provided. The heat pump air conditioner system includes a blower, a compressor, and a cooling fan. The heat pump air conditioner system includes N gears, where N≥2 and is an integer; the determining device includes:

[0131] An acquisition module 10, configured to obtain the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility corresponding to each gear;

[0132] An adjustment module 20, configured to start the blower, the compressor, and the cooling fan, and adjust the blower, the compressor, and the cooling fan based on the in-vehicle target sound pressure level and the in-vehicle target speech intelligibility to obtain the blower target speed, the compressor critical speed, and the cooling fan critical speed corresponding to each gear;

[0133] A determination module 30, configured to determine the control strategy of the heat pump air conditioner at each gear based on the blower target speed, the compressor critical speed, and the cooling fan critical speed corresponding to each gear.

[0134] Optionally, the adjustment module 20 is configured to:

[0135] For the current gear, start and adjust the blower to obtain the first in-vehicle detected sound pressure level and the first in-vehicle detected speech intelligibility; when the first in-vehicle detected sound pressure level reaches the in-vehicle set sound pressure level corresponding to the current gear and the first in-vehicle detected speech intelligibility is higher than the in-vehicle target speech intelligibility corresponding to the current gear, obtain the first current speed of the blower, the first current in-vehicle sound pressure level, and the first current in-vehicle speech intelligibility; the in-vehicle set sound pressure level is lower than the in-vehicle target sound pressure level;

[0136] Keep the blower at the first current speed, start and adjust the compressor and the cooling fan to obtain the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility; on the premise that the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility meet the first set condition, determine the maximum speed of the compressor and the maximum speed of the cooling fan;

[0137] Determine the target speed of the blower according to the first current speed, determine the critical speed of the compressor according to the maximum speed of the compressor, and determine the critical speed of the cooling fan according to the maximum speed of the cooling fan;

[0138] Wherein, the first set condition includes: the difference between the second in-vehicle detected sound pressure level and the first current in-vehicle sound pressure level does not exceed the in-vehicle sound pressure level threshold, and the difference between the first current in-vehicle speech intelligibility and the second in-vehicle detected speech intelligibility does not exceed the in-vehicle speech intelligibility threshold.

[0139] Optionally, the heat pump air conditioning system further includes a PTC heater;

[0140] The adjustment module 20 is used for:

[0141] Adjust the blower, the compressor, the cooling fan and the PTC heater on the premise of meeting the second set condition, and obtain the power of the blower, the power of the compressor, the power of the cooling fan and the power of the PTC heater; when the sum of the power of the blower, the power of the compressor, the power of the cooling fan and the power of the PTC heater is the smallest, obtain the second current speed of the blower, the current speed of the compressor, and the current speed of the cooling fan;

[0142] Take the second current speed as the target speed of the blower, take the current speed of the compressor as the critical speed of the compressor, and take the current speed of the cooling fan as the critical speed of the cooling fan;

[0143] Among them, the second set condition includes: starting the blower, the compressor, the cooling fan, and the PTC heater at a preset ambient temperature to make the vehicle interior temperature reach the set temperature, and ensuring that the blower speed does not exceed the first current speed, the compressor speed does not exceed the maximum compressor speed, and the cooling fan speed does not exceed the maximum cooling fan speed.

[0144] Optionally, the obtaining module 10 is configured to:

[0145] Obtain the outdoor target sound pressure level and the outdoor target speech intelligibility;

[0146] The adjusting module 20 is configured to:

[0147] Adjust the blower, the compressor, and the cooling fan based on the indoor target sound pressure level, the indoor target speech intelligibility, the outdoor target sound pressure level, and the outdoor target speech intelligibility, and obtain the target blower speed, the compressor critical speed, and the cooling fan critical speed corresponding to each gear.

[0148] Based on the same inventive concept as the foregoing embodiments, in another alternative embodiment, as Figure 5 shown, a controller 500 is provided, which includes a processor 520 and a memory 510. The memory 510 is coupled to the processor 520. The memory 510 stores a computer program 511. When the computer program 511 is executed by the processor 520, the controller 500 executes the steps of the determination method in the foregoing embodiments.

[0149] Based on the same inventive concept as the foregoing embodiments, in another alternative embodiment, an electric vehicle is provided, and the control logic of the heat pump air conditioning system of the electric vehicle is obtained by the determination method in the foregoing embodiments.

[0150] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0151] The present invention provides an electric vehicle and a method and device for determining the control logic of its heat pump air conditioning system. The determination method is based on the predetermined in-vehicle target sound pressure level and in-vehicle target speech intelligibility that the heat pump air conditioning needs to meet in each gear. At the same time, the blower, compressor, and cooling fan of the heat pump air conditioning are adjusted to obtain the target speed of the blower, the critical speed of the compressor, and the critical speed of the cooling fan corresponding to each gear. Based on the target speed of the blower, the critical speed of the compressor, and the critical speed of the cooling fan, the control strategy of the heat pump air conditioning in each gear is determined. Since the influence of the blower speed, compressor speed, and cooling fan speed on the vehicle noise is considered simultaneously, the speeds of the blower, compressor, and cooling fan in each gear can be reasonably matched, meeting the requirements of the in-vehicle noise sound pressure level and speech intelligibility on the premise of ensuring heating comfort in each gear, and improving the sound quality of the vehicle.

[0152] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0153] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A method for determining the control logic of an electric vehicle heat pump air conditioning system, characterized in that, The heat pump air conditioning system includes a blower, a compressor and a cooling fan. The heat pump air conditioning system has N gears, where N≥2 and is an integer. The determination method includes: Obtaining the target in-vehicle sound pressure level and the target in-vehicle speech intelligibility corresponding to each gear; Starting the blower, the compressor and the cooling fan, and adjusting the blower, the compressor and the cooling fan based on the target in-vehicle sound pressure level and the target in-vehicle speech intelligibility to obtain the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear; Determining the control strategy of the heat pump air conditioner at each gear based on the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear; The adjusting the blower, the compressor and the cooling fan based on the target in-vehicle sound pressure level and the target in-vehicle speech intelligibility to obtain the target rotational speed of the blower, the critical rotational speed of the compressor and the critical rotational speed of the cooling fan corresponding to each gear includes: For the current gear, starting and adjusting the blower to obtain the first in-vehicle detected sound pressure level and the first in-vehicle detected speech intelligibility; when the first in-vehicle detected sound pressure level reaches the in-vehicle set sound pressure level corresponding to the current gear and the first in-vehicle detected speech intelligibility is higher than the target in-vehicle speech intelligibility corresponding to the current gear, obtaining the first current rotational speed of the blower, the first current in-vehicle sound pressure level and the first current in-vehicle speech intelligibility; the in-vehicle set sound pressure level is lower than the target in-vehicle sound pressure level; Keeping the blower at the first current rotational speed, starting and adjusting the compressor and the cooling fan to obtain the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility; determining the maximum rotational speed of the compressor and the maximum rotational speed of the cooling fan on the premise that the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility meet the first set condition; Determining the target rotational speed of the blower according to the first current rotational speed, determining the critical rotational speed of the compressor according to the maximum rotational speed of the compressor, and determining the critical rotational speed of the cooling fan according to the maximum rotational speed of the cooling fan; Wherein, the first set condition includes: the difference between the second in-vehicle detected sound pressure level and the first current in-vehicle sound pressure level does not exceed the in-vehicle sound pressure level threshold, and the difference between the first current in-vehicle speech intelligibility and the second in-vehicle detected speech intelligibility does not exceed the in-vehicle speech intelligibility threshold.

2. The determination method according to claim 1, wherein The heat pump air conditioning system further includes a PTC heater; The determining the target rotational speed of the blower according to the first current rotational speed, determining the critical rotational speed of the compressor according to the maximum rotational speed of the compressor, and determining the critical rotational speed of the cooling fan according to the maximum rotational speed of the cooling fan includes: On the premise of meeting the second set condition, adjust the blower, the compressor, the cooling fan and the PTC heater, and obtain the blower power, the compressor power, the cooling fan power and the PTC heater power; when the sum of the blower power, the compressor power, the cooling fan power and the PTC heater power is the smallest, obtain the second current speed of the blower, the current speed of the compressor, and the current speed of the cooling fan; Take the second current speed as the blower target speed, take the current speed of the compressor as the compressor critical speed, and take the current speed of the cooling fan as the cooling fan critical speed; Among them, the second set condition includes: start the blower, the compressor, the cooling fan and the PTC heater at a preset ambient temperature so that the vehicle interior temperature reaches the set temperature, and satisfy that the blower speed does not exceed the first current speed, the compressor speed does not exceed the maximum compressor speed, and the cooling fan speed does not exceed the maximum cooling fan speed.

3. The determination method according to claim 2, wherein The set temperature is 22°C to 25°C.

4. The determination method according to claim 2, wherein The preset ambient temperature is -15°C to -10°C.

5. The determination method according to claim 1, wherein The vehicle interior sound pressure level threshold is the difference between the vehicle interior target sound pressure level and the vehicle interior set sound pressure level at the current gear.

6. The determination method according to claim 1, characterized in that, Before starting the blower, the compressor and the cooling fan, the determination method further includes: Obtain the vehicle exterior target sound pressure level and the vehicle exterior target speech intelligibility; The adjusting the blower, the compressor and the cooling fan based on the vehicle interior target sound pressure level and the vehicle interior target speech intelligibility to obtain the blower target speed, the compressor critical speed and the cooling fan critical speed corresponding to each gear includes: Adjust the blower, the compressor and the cooling fan based on the vehicle interior target sound pressure level, the vehicle interior target speech intelligibility, the vehicle exterior target sound pressure level and the vehicle exterior target speech intelligibility to obtain the blower target speed, the compressor critical speed and the cooling fan critical speed corresponding to each gear.

7. A device for determining the control logic of an electric vehicle heat pump air conditioning system, characterized in that, The heat pump air conditioning system includes a blower, a compressor and a cooling fan. The heat pump air conditioning system includes N gears, N≥2 and is an integer; the determination device includes: An acquisition module, configured to acquire the vehicle interior target sound pressure level and the vehicle interior target speech intelligibility corresponding to each gear; An adjustment module, configured to start the blower, the compressor and the cooling fan, and adjust the blower, the compressor and the cooling fan based on the vehicle interior target sound pressure level and the vehicle interior target speech intelligibility to obtain the blower target speed, the compressor critical speed and the cooling fan critical speed corresponding to each gear; A determination module, configured to determine the control strategy of the heat pump air conditioner at each gear based on the blower target speed, the compressor critical speed and the cooling fan critical speed corresponding to each gear; The adjustment module is used for: For the current gear position, start and adjust the blower to obtain the first in-vehicle detected sound pressure level and the first in-vehicle detected speech intelligibility; when the first in-vehicle detected sound pressure level reaches the in-vehicle set sound pressure level corresponding to the current gear position and the first in-vehicle detected speech intelligibility is higher than the in-vehicle target speech intelligibility corresponding to the current gear position, obtain the first current speed of the blower, the first current in-vehicle sound pressure level, and the first current in-vehicle speech intelligibility; the in-vehicle set sound pressure level is lower than the in-vehicle target sound pressure level; Keep the blower at the first current speed, start and adjust the compressor and the cooling fan to obtain the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility; on the premise that the second in-vehicle detected sound pressure level and the second in-vehicle detected speech intelligibility meet the first set condition, determine the maximum speed of the compressor and the maximum speed of the cooling fan; Determine the target speed of the blower according to the first current speed, determine the critical speed of the compressor according to the maximum speed of the compressor, and determine the critical speed of the cooling fan according to the maximum speed of the cooling fan; Wherein, the first set condition includes: the difference between the second in-vehicle detected sound pressure level and the first current in-vehicle sound pressure level does not exceed the in-vehicle sound pressure level threshold, and the difference between the first current in-vehicle speech intelligibility and the second in-vehicle detected speech intelligibility does not exceed the in-vehicle speech intelligibility threshold.

8. A controller, the controller comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the determination method according to any one of claims 1 to 6.

9. An electric vehicle, characterized in that, The control logic of the heat pump air conditioning system of the electric vehicle is obtained by the determination method according to any one of claims 1 to 6.

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