Electric compressor control method, device and equipment

Abstract

The invention provides an electric compressor control method, device and equipment, and the method comprises the steps that a first electric compressor rotating speed is obtained according to vehicle information, and the vehicle information comprises at least one of first information used for controlling the temperature in a vehicle and second information used for controlling the temperature of a power battery; according to the first electric compressor rotating speed, a second electric compressor rotating speed meeting a rotating speed control strategy is obtained, and the rotating speed control strategy comprises at least one of a first strategy and a second strategy; the first strategy is used for limiting that the rotating speed of the electric compressor is not in any preset rotating speed avoiding interval, and the rotating speed avoiding interval comprises the rotating speed of the electric compressor which does not meet the vibration requirement; the second strategy is used for limiting the rotating speed of the electric compressor not to be greater than the maximum rotating speed limit corresponding to the vehicle information; and controlling the electric compressor of the vehicle according to the second electric compressor rotating speed. According to the method, under the condition that the material cost and the weight of the whole vehicle are not increased, the problems of shaking and noise in the cabin can be solved, and reduction of energy consumption is facilitated.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and more particularly to a method, device and equipment for controlling an electric compressor. Background Art

[0002] Currently, electric vehicles are becoming more and more popular, and electric compressors are widely used in air-conditioning cooling. However, since electric vehicles are equipped with power batteries, an additional cooling load is brought to the refrigeration system, so it is necessary to increase the speed of the electric compressor. Therefore, when the air-conditioning cooling function of an electric vehicle is turned on and its power battery needs to be cooled, a relatively high speed of the electric compressor is required, which will cause relatively large vibrations and cabin noise.

[0003] In the prior art, sound-absorbing and sound-insulating materials and vibration-isolating materials are generally added inside the cabin, or sound insulation and noise elimination equipment are added outside to address the problems of vibration and cabin noise. However, such a design will increase the material cost and the weight of the whole vehicle. In addition, the increase in the weight of the whole vehicle will increase the driving resistance of the vehicle, thus increasing the energy consumption. Summary of the Invention

[0004] In view of this, the present application provides a method, device and equipment for controlling an electric compressor, which can address the problems of vibration and cabin noise without increasing the material cost and the weight of the whole vehicle, and is helpful for reducing the energy consumption.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling an electric compressor, including: obtaining a first electric compressor speed according to vehicle information, where the vehicle information includes at least one of first information for controlling the temperature inside the vehicle and second information for controlling the temperature of the power battery; obtaining a second electric compressor speed that meets a speed control strategy according to the first electric compressor speed, where the speed control strategy includes at least one of a first strategy and a second strategy; the first strategy is used to limit that the electric compressor speed is not in any preset speed avoidance interval, and the speed avoidance interval includes electric compressor speeds that do not meet the vibration requirements; the second strategy is used to limit that the electric compressor speed is not greater than the maximum speed limit value corresponding to the vehicle information; and controlling the electric compressor of the vehicle according to the second electric compressor speed.

[0006] In a possible implementation, if the first electric compressor speed meets the speed control strategy, the second electric compressor speed is equal to the first electric compressor speed.

[0007] In a possible implementation, if the first electric compressor speed meets the second strategy and the first electric compressor speed is in a preset first speed avoidance interval, the difference between the second electric compressor speed and the upper limit value or the lower limit value of the first speed avoidance interval is within a set difference range.

[0008] In a possible implementation, the maximum rotational speed limit value corresponding to the vehicle information does not fall within any of the preset rotational speed avoidance intervals.

[0009] In a possible implementation, the rotational speed of the electric compressor that does not meet the vibration requirement is the vibration peak point and the vibration amplitude is higher than the first threshold, or is the noise peak point and the vibration amplitude is higher than the second threshold.

[0010] In a possible implementation, if the rotational speed of the electric compressor that does not meet the vibration requirement is the vibration peak point and the vibration amplitude is higher than the first threshold, the interval width of the rotational speed avoidance interval is the first width; if the rotational speed of the electric compressor that does not meet the vibration requirement is the noise peak point and the vibration amplitude is higher than the second threshold, the interval width of the rotational speed avoidance interval is the second width; the second width is greater than the first width.

[0011] In a possible implementation, the vehicle information includes the in-vehicle temperature; the second strategy includes: the maximum rotational speed limit value when the in-vehicle temperature is less than or equal to the set temperature is less than the maximum rotational speed limit value when the in-vehicle temperature is greater than the set temperature; and / or, the vehicle information includes the vehicle speed; the second strategy includes: the maximum rotational speed limit value when the vehicle speed is less than or equal to the speed threshold is less than the maximum rotational speed limit value when the vehicle speed is greater than the speed threshold; and / or, the second strategy includes: the maximum rotational speed limit value in the first refrigeration condition is not greater than the maximum rotational speed limit value in the second refrigeration condition; the first refrigeration condition is that the first information indicates that the air-conditioning refrigeration function is not turned on and the second information indicates that the power battery needs to be cooled, or the first information indicates that the air-conditioning refrigeration function is turned on and the second information indicates that the power battery does not need to be cooled; the second refrigeration condition is that the first information indicates that the air-conditioning refrigeration function is turned on and the second information indicates that the power battery needs to be cooled.

[0012] Second aspect, an embodiment of the present application provides an electric compressor control device, including: an acquisition module, configured to acquire a first electric compressor speed according to vehicle information, where the vehicle information includes at least one of first information for controlling the temperature inside the vehicle and second information for controlling the temperature of the power battery; the acquisition module is further configured to obtain a second electric compressor speed that meets the speed control strategy according to the first electric compressor speed, where the speed control strategy includes at least one of a first strategy and a second strategy; the first strategy is used to limit that the electric compressor speed is not in any preset speed avoidance interval, and the speed avoidance interval includes electric compressor speeds that do not meet the vibration requirements; the second strategy is used to limit that the electric compressor speed is not greater than the maximum speed limit value corresponding to the vehicle information; a control module, configured to control the electric compressor of the vehicle according to the second electric compressor speed.

[0013] Third aspect, an embodiment of the present application provides an electronic device, including a memory for storing computer program instructions and a processor for executing the program instructions. When the computer program instructions are executed by the processor, the electronic device is triggered to execute the method according to any one of the first aspects described above.

[0014] Fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium includes a stored program. When the program runs, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of the first aspects described above.

[0015] In the embodiment of the present application, first, the current vehicle information is acquired. The vehicle information may include information for controlling the temperature inside the vehicle and / or information for controlling the temperature of the power battery. Thus, according to the acquired vehicle information, the electric compressor speed expected to achieve the purpose of refrigeration and cooling under the vehicle information can be obtained, and the expected electric compressor speed is adjusted as needed according to the speed control strategy. Then, based on the adjusted electric compressor speed that meets the speed control strategy, the operation of the electric compressor of the vehicle is controlled. Among them, the speed control strategy may include a strategy for avoiding electric compressor speeds that do not meet the vibration requirements to avoid large jitters during the operation of the compressor, and may include a strategy for limiting the maximum electric compressor speed corresponding to the current refrigeration and cooling requirements of the vehicle to avoid the whistling noise caused by the high-speed rotation of the compressor and reduce energy consumption. In this way, when the electric compressor operates at the adjusted electric compressor speed, the vehicle may not have problems of large jitters and / or noise, and unnecessary power consumption can be avoided. It can be seen that the embodiment of the present application can solve the problems of jitter and cabin noise without increasing the material cost and the weight of the whole vehicle, and helps to reduce energy consumption. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0017] Figure 1 It is a flowchart of a method for controlling an electric compressor provided by an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of the swept-frequency result of an electric compressor provided by an embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of the change in vehicle interior noise provided by an embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of the performance of an electric compressor provided by an embodiment of the present application;

[0021] Figure 5 It is a schematic diagram of the structure of a control device for an electric compressor provided by an embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0023] To better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0024] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0025] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the", and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0026] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0027] SeeFigure 1 , an embodiment of the present application provides a method for controlling an electric compressor, and the method includes the following steps S101-S103.

[0028] S101: Obtain the rotational speed of the first electric compressor according to vehicle information. Wherein, the vehicle information includes at least one of the first information for controlling the temperature inside the vehicle and the second information for controlling the temperature of the power battery.

[0029] The vehicle can be an electric vehicle, and the electric vehicle can include an electric compressor, a power battery, an air conditioner, etc. The electric compressor can have the function of cooling the air conditioner and can also cool the power battery to avoid the temperature of the power battery being too high.

[0030] In this way, if the power battery needs to be cooled, the operation of the electric compressor can be controlled to cool the power battery. When the refrigeration function of the air conditioner is turned on, the inside of the vehicle can also be cooled by controlling the operation of the electric compressor.

[0031] Exemplarily, the first information for controlling the temperature inside the vehicle may include: information indicating whether the refrigeration function of the air conditioner is turned on. For example, when the occupants in the vehicle feel that the temperature inside the vehicle is high, they will choose to turn on the refrigeration function of the air conditioner. At this time, the first information is that the refrigeration function of the air conditioner is turned on, and the vehicle information obtained includes that the refrigeration function of the air conditioner is turned on. For another example, when the refrigeration function of the air conditioner is not turned on, the first information is that the refrigeration function of the air conditioner is not turned on, and the vehicle information obtained includes that the refrigeration function of the air conditioner is not turned on.

[0032] When the first information includes that the refrigeration function of the air conditioner is turned on, the first information can also collect the temperature inside the vehicle, and can also include the set temperature, and the temperature difference between the temperature inside the vehicle and the set temperature.

[0033] The temperature inside the vehicle is used to represent the real-time temperature inside the vehicle, such as 30°C.

[0034] The set temperature is used to represent the temperature at which the occupants in the vehicle feel comfortable after turning on the refrigeration function of the air conditioner, such as 25°C.

[0035] In one embodiment, the vehicle can control the operation of the electric compressor based on the evaporator temperature. When the evaporator temperature is low, the rotational speed of the electric compressor is high; conversely, the rotational speed of the electric compressor is low. Wherein, in the refrigeration system, the evaporator temperature can represent the saturation temperature at which the refrigerant liquid changes from a liquid to a gas in the evaporator.

[0036] Feasibly, the evaporator temperature can be determined according to the temperature difference. Specifically, the greater the temperature difference, the lower the evaporator temperature and the higher the rotational speed of the electric compressor.

[0037] Exemplarily, the second information for controlling the temperature of the power battery may include: information indicating whether the power battery needs to be cooled down.

[0038] The temperature of the power battery can be measured by a temperature sensor, and based on the comparison result between the measurement result (i.e., the temperature of the power battery) and a preset battery temperature threshold, it can be determined whether the power battery needs to be cooled down.

[0039] If the temperature of the power battery is higher than the preset battery temperature threshold, the power battery needs to be cooled down. At this time, the second information obtained includes the information that the power battery needs to be cooled down. Then, the second information may further include the temperature of the power battery, and may also include the battery temperature difference between the temperature of the power battery and the preset battery temperature threshold. Conversely, if the power battery does not need to be cooled down, the second information may include the information that the power battery does not need to be cooled down.

[0040] Feasibly, the above evaporator temperature can also be determined according to the battery temperature difference. Specifically, the greater the battery temperature difference, the lower the evaporator temperature and the higher the rotational speed of the electric compressor.

[0041] After obtaining the vehicle information, the rotational speed of the electric compressor required to meet the refrigeration demand corresponding to the vehicle information can be obtained according to the vehicle information.

[0042] S102: Obtain a second rotational speed of the electric compressor that meets the speed control strategy according to the first rotational speed of the electric compressor. Among them, the speed control strategy includes at least one of the first strategy and the second strategy.

[0043] The first strategy is used to limit that the rotational speed of the electric compressor is not within any preset rotational speed avoidance interval, and the rotational speed avoidance interval includes the rotational speed of the electric compressor that does not meet the vibration requirement. Controlling the rotational speed of the electric compressor according to the first strategy can prevent the electric compressor from operating at a rotational speed that will cause large vibrations, so as to cope with the vehicle vibration problem.

[0044] The second strategy is used to limit that the rotational speed of the electric compressor is not greater than the maximum rotational speed limit corresponding to the vehicle information. Feasibly, the maximum rotational speed limits corresponding to different vehicle information may vary. Controlling the rotational speed of the electric compressor according to the second strategy can prevent the electric compressor from operating at an unnecessarily excessive rotational speed, so as to cope with the in-vehicle noise and power consumption problems.

[0045] In one embodiment, the rotational speed of the electric compressor that does not meet the vibration requirement is a vibration peak point (i.e., the vibration amount at this rotational speed is higher than the vibration amount at adjacent rotational speeds) and the vibration amplitude is higher than the first threshold, or is a noise peak point (i.e., the noise at this rotational speed is higher than the noise at adjacent rotational speeds) and the vibration amplitude is higher than the second threshold.

[0046] The first threshold and the second threshold may be equal or different.

[0047] The first threshold and the second threshold can be fixed values preset as needed, or can be values obtained based on the vibration amounts at multiple rotational speeds (such as Figure 2 each test rotational speed within the range of 1000 rpm - 7000 rpm shown).

[0048] S103: Control the electric compressor of the vehicle according to the rotational speed of the second electric compressor.

[0049] By controlling the electric compressor of the vehicle to operate at the rotational speed of the second electric compressor that meets the rotational speed control strategy, not only can the refrigeration demand be met, but also the problems of vehicle jitter and / or noise can be solved, and it helps to reduce energy consumption, thereby improving the experience of the vehicle occupants.

[0050] In the embodiment of the present application, first, the current vehicle information is obtained. The vehicle information may include information for controlling the temperature inside the vehicle and / or information for controlling the temperature of the power battery. Thus, according to the obtained vehicle information, the rotational speed of the electric compressor expected to achieve the purpose of refrigeration and cooling can be obtained, and the rotational speed of the electric compressor expected to be required is adjusted as needed according to the rotational speed control strategy. Then, based on the adjusted rotational speed of the electric compressor that conforms to the rotational speed control strategy, the operation of the electric compressor of the vehicle is controlled. Among them, the rotational speed control strategy may have a strategy for avoiding the rotational speed of the electric compressor that does not meet the vibration requirements to avoid large jitter when the compressor operates, and may have a strategy for limiting the maximum rotational speed of the electric compressor corresponding to the current refrigeration and cooling demand of the vehicle to avoid the whistling noise caused by the high-speed rotation of the compressor and reduce energy consumption. In this way, when the electric compressor operates at the adjusted rotational speed of the electric compressor, the vehicle may not have problems of large jitter and / or noise, and unnecessary power consumption can be avoided. It can be seen that the embodiment of the present application can solve the problems of jitter and cabin noise without increasing the material cost and the weight of the whole vehicle, and helps to reduce energy consumption.

[0051] In one embodiment, if the rotational speed of the first electric compressor meets the rotational speed control strategy, the rotational speed of the second electric compressor is equal to the rotational speed of the first electric compressor.

[0052] Taking the rotational speed control strategy including the first strategy and the second strategy as an example, if the rotational speed of the first electric compressor simultaneously meets the first strategy and the second strategy, that is, the rotational speed of the first electric compressor does not fall into any rotational speed avoidance interval and is less than the maximum rotational speed limit value corresponding to the vehicle information, there is no need to perform an optimization adjustment process on the rotational speed of the first electric compressor. Therefore, the rotational speed of the second electric compressor is equal to the rotational speed of the first electric compressor.

[0053] For example, according to the vehicle information, the rotational speed of the first electric compressor is obtained as 4000 rpm. Since 4000 rpm is less than the maximum rotational speed limit value of 4500 rpm corresponding to the vehicle information and does not fall into any rotational speed avoidance interval, that is, the rotational speed of the first electric compressor satisfies both the first strategy and the second strategy. Therefore, the rotational speed of the second electric compressor is equal to the rotational speed of the first electric compressor, and the rotational speed of the second electric compressor is 4000 rpm.

[0054] Feasibly, if the rotational speed of the first electric compressor does not satisfy the rotational speed control strategy, then the rotational speed of the second electric compressor is not equal to the rotational speed of the first electric compressor.

[0055] In one embodiment, the rotational speed control strategy includes the first strategy, then the rotational speed of the second electric compressor satisfies the first strategy, that is, the rotational speed of the second electric compressor is not in any rotational speed avoidance interval. Therefore, if the electric compressor is controlled to operate at the rotational speed of the second electric compressor, the vehicle can be prevented from generating large vibrations.

[0056] In this way, if the rotational speed control strategy does not include the second strategy, then in one embodiment of the present application, if the rotational speed of the first electric compressor is in the preset first rotational speed avoidance interval, the difference between the rotational speed of the second electric compressor and the upper limit value or the lower limit value of the first rotational speed avoidance interval is within the set difference range.

[0057] If the rotational speed control strategy further includes the second strategy, then in one embodiment of the present application, if the rotational speed of the first electric compressor satisfies the second strategy and the rotational speed of the first electric compressor is in the preset first rotational speed avoidance interval, the difference between the rotational speed of the second electric compressor and the upper limit value or the lower limit value of the first rotational speed avoidance interval is within the set difference range.

[0058] Feasibly, according to the magnitude of the difference between the rotational speed of the first electric compressor and the upper limit value and the lower limit value, and in combination with the second strategy, it can be determined whether the rotational speed of the second electric compressor is adjusted according to the upper limit value or the lower limit value.

[0059] Exemplarily, the set difference range can be 4 - 6 rpm. For example, the difference between the rotational speed of the second electric compressor and the upper limit value or the lower limit value of the first rotational speed avoidance interval is 5 rpm.

[0060] For example, if the rotational speed of the first electric compressor is 3100 rpm, since 3100 rpm is less than the maximum rotational speed limit value of 3500 rpm corresponding to the vehicle information and 3100 rpm falls into the first rotational speed avoidance interval [3050, 3150], then the first electric compressor needs to be optimized and adjusted according to the first strategy. In this way, the rotational speed of the second electric compressor can be increased by 5 rpm based on the upper limit value of 3150 or decreased by 5 rpm based on the lower limit value of 3050, that is, 3155 rpm or 3045 rpm.

[0061] In another embodiment, the speed control strategy includes a second strategy, and the speed of the second electric compressor satisfies the second strategy, that is, the speed of the second electric compressor is less than or equal to the maximum speed limit value corresponding to the vehicle information. Therefore, if the electric compressor is controlled to operate at the speed of the second electric compressor, the electric compressor can be prevented from operating at an unnecessarily high speed, thereby reducing the whistling sound of the electric compressor and the in-vehicle noise, and also avoiding refrigeration surplus and unnecessary power consumption.

[0062] Thus, in an embodiment of the present application, if the speed of the first electric compressor does not satisfy the second strategy, the speed of the second electric compressor is less than or equal to the maximum speed limit value corresponding to the vehicle information.

[0063] For example, according to the speed of the first electric compressor being 4500 rpm, since 4500 rpm is greater than the maximum speed limit value of 4000 rpm corresponding to the vehicle information, the speed of the first electric compressor needs to be optimized and adjusted according to the second strategy, and the obtained adjustment value (i.e., the maximum speed limit value of 4000 rpm), then the speed of the second compressor can be less than or equal to the maximum speed limit value of 4000 rpm.

[0064] In yet another embodiment, the speed control strategy includes a first strategy and a second strategy, and the speed of the second electric compressor satisfies both the first strategy and the second strategy, that is, the speed of the second electric compressor is not within any speed avoidance interval and is less than or equal to the maximum speed limit value corresponding to the vehicle information.

[0065] When the speed control strategy includes a first strategy and a second strategy, the speed of the first electric compressor can be adjusted as needed first based on the first strategy and then based on the second strategy. It is also possible to first adjust the speed of the first electric compressor as needed based on the second strategy and then based on the first strategy.

[0066] For example, when adjusting as needed first based on the second strategy and then based on the first strategy, if the speed of the first electric compressor is greater than the maximum speed limit value corresponding to the vehicle information, and if the maximum speed limit value does not fall into any speed avoidance interval, then the speed of the second electric compressor can be the maximum speed limit value.

[0067] If the maximum speed limit value falls into a certain speed avoidance interval, the speed of the second electric compressor can be obtained based on the lower limit value of the speed avoidance interval.

[0068] For another example, when making on-demand adjustments based on the first strategy and then the second strategy, if the rotational speed of the first electric compressor falls within a certain large rotational speed avoidance range, two adjustment values that do not fall within any rotational speed avoidance range can be obtained. If both of these two adjustment values are greater than the maximum rotational speed limit corresponding to the vehicle information, and the maximum rotational speed limit does not fall within any rotational speed avoidance range, then the rotational speed of the second electric compressor can be the maximum rotational speed limit.

[0069] If the maximum rotational speed limit falls within a certain small rotational speed avoidance range, it is still necessary to combine this small rotational speed avoidance range to obtain the rotational speed of the second electric compressor.

[0070] Based on the above, to simplify the adjustment process, in an embodiment of the present application, it can be specified that the maximum rotational speed limit corresponding to the vehicle information is not within any preset rotational speed avoidance range.

[0071] Next, the first strategy and the second strategy will be described separately.

[0072] When the electric compressor of the vehicle operates at certain rotational speeds, a large amount of vibration will be generated, and then the vehicle will vibrate greatly, resulting in a poor experience for the passengers in the vehicle. Thus, to avoid large vibrations of the vehicle when the electric compressor operates, there can be a first strategy for vehicle anti-vibration as described above to prevent the electric compressor from operating at rotational speeds that will cause large vibrations.

[0073] In this way, the rotational speed of the electric compressor can be controlled according to the first strategy to solve the vehicle vibration problem.

[0074] In one embodiment, the above first strategy can be obtained through the following steps 1.1 - 1.4.

[0075] Step 1.1: Obtain the rotational speed range of the electric compressor.

[0076] In one embodiment, the rotational speed range can be obtained from the frequency sweep result of the vehicle by a frequency sweep instrument. For example, if the frequency sweep result is as Figure 2 shown, then the rotational speed range is 1000 rpm - 7000 rpm.

[0077] Step 1.2: Determine the rotational speeds (vibration points) of the electric compressor that do not meet the vibration requirements within the rotational speed range.

[0078] When the electric compressor operates at different rotational speeds, different degrees of vibration will be generated. Therefore, the vibration points can be determined according to the degree of vibration.

[0079] In one possible implementation, the degree of vibration of the electric compressor can be determined by the vibration amount inside the vehicle, and the vibration amount inside the vehicle can be determined according to the vibration situation of the vehicle itself.

[0080] Feasible. The in-vehicle vibration amount can be determined based on the jitter of the vehicle target component in at least one direction. Among them, the vehicle target component can be the steering wheel, driver's seat, etc. For example, if the vehicle steering wheel jitters in both the +Z direction and the -X direction, the vibration points can be determined based on the vibration conditions in the above two directions.

[0081] For example, refer to Figure 2 the in-vehicle vibration amount schematic diagram on the upper side in [reference], where Curve 1 and Curve 2 respectively show the change trends of the vibration amount of the vehicle steering wheel in the +Z direction and the -X direction when the electric compressor operates at a speed of 1000 rpm - 7000 rpm.

[0082] Combined with referring to Figure 2 the in-vehicle vibration amount schematic diagram on the upper side in [reference], when the electric compressor operates at speeds of 3120 rpm, 4400 rpm, 5000 rpm, 6200 rpm, and 6800 rpm, the vibration requirements are not met. At this time, the jitter degree of the electric compressor is large, and the above speeds can be determined as vibration points.

[0083] In one embodiment, in addition to determining the vibration points based on the in-vehicle vibration amount, the vibration points can also be determined in combination with the in-vehicle noise amount. In a possible implementation, the in-vehicle noise amount can be determined based on the noise amount that can be perceived by the in-vehicle occupants. Feasibly, the in-vehicle noise amount can be determined based on the noise amount felt by the right ear of the driver.

[0084] For example, refer to Figure 2 the in-vehicle noise amount schematic diagram on the lower side in [reference], where Curve 3 shows the change trend of the noise amount felt by the right ear of the driver when the electric compressor operates at a speed of 1000 - 7000 rpm.

[0085] Combined with Figure 2 the in-vehicle vibration amount schematic diagram on the upper side in [reference], when the electric compressor operates at 5300 rpm, the in-vehicle vibration amount is large (the vibration amplitude is not greater than the first threshold and it is not a vibration peak point). Then combined with Figure 2 the in-vehicle noise amount schematic diagram on the lower side in [reference], when the electric compressor operates at 5300 rpm, there is a noise peak point and the vibration amplitude is higher than the second threshold, then this speed can be determined as a vibration point.

[0086] Step 1.3: Determine the corresponding speed avoidance interval based on the vibration points.

[0087] The speed avoidance interval corresponding to each vibration point can be determined, and each speed avoidance interval includes the corresponding vibration point.

[0088] Feasibly, the width of the speed avoidance interval can be determined according to the vibration and noise conditions at the vibration points.

[0089] In one embodiment, if the rotational speed of the electric compressor that does not meet the vibration requirement (i.e., the vibration point) is the vibration peak point and the vibration amplitude is higher than the first threshold (or the vibration point that meets the noise requirement), the interval width of the rotational speed avoidance interval is the first width.

[0090] Feasibly, for the vibration point that meets the noise requirement, the interval width of the corresponding rotational speed avoidance interval can be relatively small to avoid this vibration point to a lesser extent.

[0091] For example, referring to Figure 2 , it is determined that 3120 rpm, 4400 rpm, 5000 rpm, 6200 rpm, and 6800 rpm are the vibration points that meet the noise requirement. Therefore, it can be determined that the interval width of the corresponding rotational speed avoidance intervals is all 100 rpm, and then the rotational speed avoidance intervals of 3070 - 3170 rpm, 4350 - 4450 rpm, 4900 - 5000 rpm, 6150 - 6250 rpm, and 6750 - 6850 rpm can be obtained.

[0092] In one embodiment, if the rotational speed of the electric compressor that does not meet the vibration requirement (i.e., the vibration point) is the noise peak point and the vibration amplitude is higher than the second threshold (or the vibration point that does not meet the noise requirement), the interval width of the rotational speed avoidance interval is the second width.

[0093] Feasibly, for the vibration point that does not meet the noise requirement, the interval width of the corresponding rotational speed avoidance interval can be relatively large to avoid this vibration point to a greater extent.

[0094] For example, referring to Figure 2 , it is determined that 5300 rpm is the vibration point that does not meet the noise requirement. Therefore, it can be determined that the interval width of the corresponding rotational speed avoidance interval is 200 rpm, and then the rotational speed avoidance interval of 5200 - 5400 rpm can be obtained.

[0095] In a possible implementation, the second width is greater than the first width. For example, the second width is 200 rpm and the first width is 100 rpm.

[0096] As shown in Table 1, it is a rotational speed avoidance interval control strategy provided by an embodiment of the present application. Table 1 includes the rotational speed avoidance intervals determined according to the above Figure 2 determination.

[0097] Table 1

[0098] Serial number Speed avoidance range rpm Compressor speed adjustment value (rpm) 1 [3070,3170] Taking the upper limit value of the boundary value increased by 5 rpm or the lower limit value decreased by 5 rpm as the adjustment value 2 [4350,4450] Taking the upper limit value of the boundary value increased by 5 rpm or the lower limit value decreased by 5 rpm as the adjustment value 3 [4900,5000] Taking the upper limit value of the boundary value increased by 5 rpm or the lower limit value decreased by 5 rpm as the adjustment value 4 [5250,5400] Taking the upper limit value of the boundary value increased by 5 rpm or the lower limit value decreased by 5 rpm as the adjustment value 5 [6150,6250] Taking the upper limit value of the boundary value increased by 5 rpm or the lower limit value decreased by 5 rpm as the adjustment value 6 [6750,6850] Taking the upper limit value of the boundary value increased by 5 rpm or the lower limit value decreased by 5 rpm as the adjustment value

[0099] Step 1.4: Obtain the first strategy according to the rotational speed avoidance interval. The first strategy can be pre - stored in the vehicle's memory.

[0100] One feasible implementation is that when the rotational speed of the electric compressor obtained based on vehicle information is within the rotational speed avoidance range, the boundary values (upper limit value or lower limit value) of the corresponding rotational speed avoidance range can be obtained, and adjusted as needed based on the boundary values to obtain the rotational speed adjustment value of the compressor. The difference between the rotational speed adjustment value of the compressor and the upper limit value or lower limit value of the corresponding rotational speed avoidance range is within the set difference range. For example, the set difference range can be set to 4 - 6 rpm.

[0101] Specifically, adjusting as needed based on the boundary value can be increasing the first rotational speed adjustment amount based on the upper limit value or decreasing the second rotational speed adjustment amount based on the lower limit value. Optionally, the first rotational speed adjustment amount and the second rotational speed adjustment amount may not be equal, or may be equal, for example, both are 5 rpm.

[0102] For example, if the rotational speed of the electric compressor obtained based on vehicle information is 3120 rpm, and this rotational speed falls within the rotational speed avoidance range [3070, 3170], therefore, the rotational speed of the electric compressor needs to be adjusted according to the first strategy. For example, it can be increased by 5 rpm based on the upper limit value of 3170 rpm or decreased by 5 rpm based on 3070 rpm, then the adjustment value can be 3165 rpm or 3175 rpm.

[0103] In the embodiments of the present application, when the rotational speed of the electric compressor obtained based on vehicle information is within the rotational speed avoidance range, the rotational speed of the electric compressor can be adjusted according to the first strategy, and the problem of vehicle jitter can be solved by avoiding the electric compressor operating at a rotational speed that will generate large jitters.

[0104] During the high - speed operation of the electric compressor of the vehicle, a whistling sound will be generated, resulting in a large amount of noise inside the vehicle and affecting the experience of the passengers inside the vehicle. Thus, in order to reduce the whistling sound and the noise inside the vehicle, there can be a second strategy for controlling the maximum rotational speed of the electric compressor as described above to avoid the electric compressor operating at an unnecessarily high rotational speed.

[0105] If air - conditioning cooling is still carried out when the temperature inside the vehicle is lower than the set temperature, there will be a problem of cooling surplus. The cooling surplus will also cause the electric compressor to operate at a non - essential high rotational speed, resulting in a high - speed noise problem. Moreover, the non - essential high - speed operation will also increase power consumption.

[0106] Thus, the noise of the electric compressor can be controlled according to the second strategy to solve the problem of noise inside the cabin, and it is also helpful to reduce energy consumption.

[0107] To address the problem that the electric compressor operates at an unnecessarily high rotational speed due to cooling surplus, resulting in high noise and high power consumption, the temperature inside the vehicle can be collected, and the corresponding maximum rotational speed limit can be determined according to the temperature inside the vehicle.

[0108] Thus, in one embodiment, the vehicle information includes the in-vehicle temperature; the second strategy includes: the maximum rotational speed limit when the in-vehicle temperature is less than or equal to the set temperature is less than the maximum rotational speed limit when the in-vehicle temperature is greater than the set temperature.

[0109] When the in-vehicle temperature is less than the set temperature, it indicates that air-conditioning refrigeration is not required, and thus the electric compressor does not need to operate at a high rotational speed to meet the refrigeration demand. On the contrary, it indicates that air-conditioning refrigeration is required, and the electric compressor needs to operate at a high rotational speed to meet the refrigeration demand. Therefore, by limiting the relationship between the in-vehicle temperature and the set temperature, the problem of refrigeration surplus can be solved, and thus the noise and power consumption caused by unnecessary high-speed operation can be avoided.

[0110] In one embodiment, the vehicle information includes the vehicle speed; the second strategy includes: the maximum rotational speed limit when the vehicle speed is less than or equal to the speed threshold is less than the maximum rotational speed limit when the vehicle speed is greater than the speed threshold.

[0111] When the vehicle speed is less than or equal to the speed threshold, it indicates that the fresh air intake is less and / or the power battery does not need to be cooled, so the electric compressor does not need to operate at a relatively high rotational speed to meet the refrigeration demand. On the contrary, it indicates that the fresh air intake is more and / or the power battery needs to be cooled, so the electric compressor needs to operate at a high rotational speed to meet the refrigeration demand. Therefore, by limiting the relationship between the vehicle speed and the speed threshold, the electric compressor can be prevented from operating at an unnecessarily high rotational speed, so as to reduce the whistling sound of the electric compressor and the in-vehicle noise.

[0112] In one embodiment, the second strategy includes: the maximum rotational speed limit when the refrigeration condition is the first condition is not greater than the maximum rotational speed limit when the refrigeration condition is the second condition.

[0113] The first condition is that the first information indicates that the air-conditioning refrigeration function is not turned on and the second information indicates that the power battery needs to be cooled, or the first information indicates that the air-conditioning refrigeration function is turned on and the second information indicates that the power battery does not need to be cooled.

[0114] The second condition is that the first information indicates that the air-conditioning refrigeration function is turned on and the second information indicates that the power battery needs to be cooled.

[0115] When the refrigeration condition is the first condition, it indicates that air-conditioning refrigeration or power battery cooling is required, so the electric compressor does not need to operate at a high rotational speed to meet the refrigeration demand. When the refrigeration condition is the second condition, it indicates that air-conditioning refrigeration and power battery cooling are required, so the electric compressor needs to operate at a high rotational speed to meet the refrigeration demand. Therefore, by limiting the refrigeration condition, the rotational speed of the electric compressor can be controlled, and thus the noise of the electric compressor can be controlled to solve the problem of in-cabin noise.

[0116] In one embodiment, the vehicle information may include the in-vehicle temperature, the vehicle speed, and the refrigeration condition, and the corresponding second strategy may include the content shown in Table 2 below.

[0117] Table 2

[0118]

[0119] Among them, the set temperature is Tset (for example, it can be 25°C), and the speed threshold is 30 kph.

[0120] For example, if the first information obtained includes that the air-conditioning refrigeration function is turned on, the in-vehicle temperature T is 25°C, and the set temperature Tset is 25°C. The second information includes that the power battery does not need to be cooled. The vehicle information includes the above first information and second information, and also includes the vehicle speed of 20 kph. Referring to Table 2, when the in-vehicle temperature is equal to the set temperature, the maximum speed of the electric compressor is 3800 rpm.

[0121] For example, if the first information obtained includes that the air-conditioning refrigeration function is turned on, the in-vehicle temperature T is 30°C, and the set temperature Tset is 25°C. The second information includes that the power battery does not need to be cooled. The vehicle information includes the above first information and second information, and also includes the vehicle speed of 20 kph. Referring to Table 2, when the in-vehicle temperature is higher than the set temperature, the vehicle speed of 20 kph is less than the speed threshold of 30 kph, and the refrigeration condition is single-on, the maximum speed of the electric compressor is 4500 rpm.

[0122] For another example, if the first information obtained includes that the air-conditioning refrigeration function is turned on, the in-vehicle temperature T is 30°C, and the set temperature Tset is 25°C. The second information includes that the power battery needs to be cooled. The vehicle information includes the above first information and second information, and also includes the vehicle speed of 35 kph and lasts for more than 10 s. Referring to Table 2, when the in-vehicle temperature is higher than the set temperature, the vehicle speed of 35 kph is greater than the speed threshold of 30 kph, and the refrigeration condition is double-on, the maximum speed of the electric compressor is 6500 rpm.

[0123] During the operation of the electric compressor, noises of different orders will be generated, such as first-order noise, second-order noise, etc. Therefore, it is possible to judge whether the in-vehicle noise is improved after the optimization adjustment of the first electric compressor speed according to the working frequency and sound pressure level of the same-order noise before and after the optimization adjustment process.

[0124] As Figure 3 shown, it is a schematic diagram of the change in in-vehicle noise provided by the embodiment of the present application.

[0125] Figure 3Schematic diagram of the first-order noise change located on the upper side. Curve 4 shows the change in the sound pressure level of the first-order noise over time when the electric compressor operates at the first electric compressor speed (the speed before the optimization adjustment process). Curve 5 shows the change in the sound pressure level of the first-order noise over time when the electric compressor operates at the speed optimized and adjusted according to the second strategy (the speed after the optimization adjustment process).

[0126] Combined with Figure 3 Schematic diagram of the first-order noise change located on the upper side. When the first-order noise is generated before the optimization adjustment process, the operating frequency of the electric compressor is 117 Hz and the sound pressure level is 53.89 dB(A). When the first-order noise is generated after the optimization adjustment process, the operating frequency of the electric compressor is 108 Hz and the sound pressure level is 43.06 dB(A).

[0127] Therefore, compared with before the optimization adjustment process, after the optimization adjustment process, the operating frequency of the electric compressor when the first-order noise is generated decreases by 11 Hz, and the sound pressure level decreases by 10.83 dB(A). Thus, optimizing and adjusting the speed of the electric compressor obtained according to the vehicle information according to the second strategy can improve the first-order noise.

[0128] Figure 3 Schematic diagram of the second-order noise change located on the lower side. Curve 6 shows the change in the sound pressure level of the second-order noise over time when the electric compressor operates at the first electric compressor speed (the speed before the optimization adjustment process). Curve 7 shows the change in the sound pressure level of the second-order noise over time when the electric compressor operates at the speed optimized and adjusted according to the second strategy (the speed after the optimization adjustment process).

[0129] Combined with Figure 3 Schematic diagram of the second-order noise change located on the lower side. When the second-order noise is generated before the optimization adjustment process, the operating frequency of the electric compressor is 234 Hz and the sound pressure level is 45.41 dB(A). When the second-order noise is generated after the optimization adjustment process, the operating frequency of the electric compressor is 216 Hz and the sound pressure level is 43.31 dB(A).

[0130] Therefore, compared with before the optimization adjustment process, after the optimization adjustment process, the operating frequency of the electric compressor when the second-order noise is generated decreases by 18 Hz, and the sound pressure level decreases by 2.1 dB(A). Thus, optimizing and adjusting the speed of the electric compressor obtained according to the vehicle information according to the second strategy can improve the second-order noise.

[0131] In summary, optimizing and adjusting the speed of the electric compressor obtained according to the vehicle information according to the second strategy can improve the in-vehicle noise.

[0132] Such as Figure 4As shown in the figure, it is a schematic diagram of the performance of an electric compressor provided by an embodiment of the present application. Figure 4 It includes the changes in refrigerating capacity, power consumption, and coefficient of performance COP (COP, Coefficient Of Performance) as the rotational speed of the electric compressor increases. Among them, the coefficient of performance COP is used to represent the refrigerating capacity that can be obtained per unit power consumption. The larger the coefficient of performance COP, the better the refrigerating effect.

[0133] Combined with Figure 4 , when the rotational speed of the electric compressor is 8000 rpm, the coefficient of performance 2.46 is lower than the coefficient of performance 2.73 when the rotational speed of the electric compressor is 6000 rpm. Therefore, the refrigerating effect of the former is worse than that of the latter. However, the refrigerating capacity and power consumption of the former are both higher than those of the latter. Therefore, excessive refrigerating capacity will be generated, consuming more power consumption, but not achieving a better refrigerating effect. Therefore, as the rotational speed increases, both the refrigerating capacity and power consumption will increase, but the refrigerating effect of the electric compressor is not better.

[0134] In this way, by controlling the rotational speed of the electric compressor obtained according to the vehicle information through the second strategy, it is possible to control the electric compressor to operate at a relatively low rotational speed under the condition of achieving the refrigerating effect, which can not only avoid refrigerating surplus and reduce unnecessary energy consumption, but also improve the whistling sound generated by the high-speed operation of the electric compressor.

[0135] Refer to Figure 5 It is a schematic diagram of the structure of an electric compressor control device provided by an embodiment of the present application. As Figure 5 shown, the device 500 includes:

[0136] An acquisition module 501, configured to acquire a first rotational speed of the electric compressor according to vehicle information, where the vehicle information includes at least one of first information for controlling the temperature inside the vehicle and second information for controlling the temperature of the power battery;

[0137] The acquisition module 501 is further configured to obtain a second rotational speed of the electric compressor that meets the rotational speed control strategy according to the first rotational speed of the electric compressor, where the rotational speed control strategy includes at least one of a first strategy and a second strategy;

[0138] The first strategy is used to limit that the rotational speed of the electric compressor is not within any preset rotational speed avoidance interval, and the rotational speed avoidance interval includes the rotational speed of the electric compressor that does not meet the vibration requirements;

[0139] The second strategy is used to limit that the rotational speed of the electric compressor is not greater than the maximum rotational speed limit value corresponding to the vehicle information;

[0140] A control module 502, configured to control the electric compressor of the vehicle according to the second rotational speed of the electric compressor.

[0141] Corresponding to the above embodiments, the present application also provides an electronic device. Figure 6 FIG. 600 is a schematic structural diagram of an electronic device 600 provided by an embodiment of the present invention. The electronic device 600 may include: a processor 601, a memory 602, and a communication unit 603. These components communicate through one or more buses. Those skilled in the art can understand that the structure of the electronic device shown in the figure does not constitute a limitation to the embodiments of the present invention. It may be a bus structure, a star structure, and may also include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0142] Among them, the communication unit 603 is used to establish a communication channel so that the electronic device can communicate with other devices. Receive user data sent by other devices or send user data to other devices.

[0143] The processor 601 is the control center of the electronic device. It connects various parts of the entire electronic device through various interfaces and lines. By running or executing software programs, instructions, and / or modules stored in the memory 602, and by calling data stored in the memory, it executes various functions of the electronic device and / or processes data. The processor may be composed of an integrated circuit (IC). For example, it may be composed of a single packaged IC, or may be composed of multiple packaged ICs with the same or different functions connected together. For example, the processor 601 may only include a central processing unit (CPU). In the embodiment of the present invention, the CPU may be a single operation core or may include multiple operation cores.

[0144] The memory 602 is used to store the execution instructions of the processor 601. The memory 602 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0145] When the execution instructions in the memory 602 are executed by the processor 601, the electronic device 600 can execute Figure 1 some or all of the steps in the illustrated embodiments.

[0146] In specific implementation, the present invention further provides a computer storage medium, wherein the computer storage medium can store a program, and when the program is executed, it can include some or all of the steps in the embodiments of the simulation scenario generation method provided by the present invention. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), or the like.

[0147] In specific implementation, the present invention further provides a computer program product, wherein the computer program product includes executable instructions, and when the executable instructions are executed on a computer, the computer is caused to execute some or all of the steps in the embodiments of the simulation scenario generation method provided by the present invention.

[0148] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution in the embodiments of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product can be stored in a storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments of the present invention.

[0149] For the same or similar parts among the various embodiments in this specification, reference can be made to each other. In particular, for the device embodiments and the terminal embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A method for controlling an electric compressor, characterized in that, Including: Obtain a first electric compressor speed according to vehicle information, where the vehicle information includes at least one of first information for controlling the temperature inside the vehicle and second information for controlling the temperature of the power battery; Obtain a second electric compressor speed that meets the speed control strategy according to the first electric compressor speed, where the speed control strategy includes at least one of a first strategy and a second strategy; The first strategy is used to define that the electric compressor speed is not in any preset speed avoidance interval, and the speed avoidance interval includes electric compressor speeds that do not meet the vibration requirements; The second strategy is used to define that the electric compressor speed is not greater than the maximum speed limit value corresponding to the vehicle information; Control the electric compressor of the vehicle according to the second electric compressor speed.

2. The method according to claim 1, characterized in that If the first electric compressor speed meets the speed control strategy, the second electric compressor speed is equal to the first electric compressor speed.

3. The method according to claim 1, wherein If the first electric compressor speed meets the second strategy and the first electric compressor speed is in a preset first speed avoidance interval, the difference between the second electric compressor speed and the upper limit value or the lower limit value of the first speed avoidance interval is within a set difference range.

4. The method according to claim 1, wherein The maximum speed limit value corresponding to the vehicle information is not in any of the preset speed avoidance intervals.

5. The method according to claim 1, wherein The electric compressor speed that does not meet the vibration requirements is a vibration peak point and the vibration amplitude is higher than a first threshold, or is a noise peak point and the vibration amplitude is higher than a second threshold.

6. The method according to claim 5, characterized in that, If the electric compressor speed that does not meet the vibration requirements is a vibration peak point and the vibration amplitude is higher than the first threshold, the interval width of the speed avoidance interval is a first width; If the electric compressor speed that does not meet the vibration requirements is a noise peak point and the vibration amplitude is higher than the second threshold, the interval width of the speed avoidance interval is a second width; The second width is greater than the first width.

7. According to the method described in any one of claims 1-6, characterized in that, The vehicle information includes the temperature inside the vehicle; The second strategy includes: the maximum speed limit value when the temperature inside the vehicle is less than or equal to the set temperature is less than the maximum speed limit value when the temperature inside the vehicle is greater than the set temperature; And / or The vehicle information includes the vehicle speed; The second strategy includes: the maximum speed limit value when the vehicle speed is less than or equal to the speed threshold is less than the maximum speed limit value when the vehicle speed is greater than the speed threshold; And / or The second strategy includes: the maximum speed limit value in the first refrigeration condition is not greater than the maximum speed limit value in the second refrigeration condition; The first condition is that the first information indicates that the air-conditioning refrigeration function is not turned on and the second information indicates that the power battery needs to be cooled, or the first information indicates that the air-conditioning refrigeration function is turned on and the second information indicates that the power battery does not need to be cooled; The second condition is that the first information indicates that the air-conditioning refrigeration function is turned on and the second information indicates that the power battery needs to be cooled.

8. An electric compressor control device, characterized in that, Including: An acquisition module for obtaining a first electric compressor speed according to vehicle information, where the vehicle information includes at least one of first information for controlling the temperature inside the vehicle and second information for controlling the temperature of the power battery; The obtaining module is further configured to obtain a second rotational speed of the electric compressor that meets the rotational speed control strategy according to the rotational speed of the first electric compressor, where the rotational speed control strategy includes at least one of a first strategy and a second strategy; The first strategy is used to define that the rotational speed of the electric compressor is not in any of the preset rotational speed avoidance intervals, and the rotational speed avoidance interval includes the rotational speed of the electric compressor that does not meet the vibration requirement; The second strategy is used to define that the rotational speed of the electric compressor is not greater than the maximum rotational speed limit value corresponding to the vehicle information; The control module is configured to control the electric compressor of the vehicle according to the second rotational speed of the electric compressor.

9. An electronic device, characterized in that, It includes a memory for storing computer program instructions and a processor for executing the program instructions. Wherein, when the computer program instructions are executed by the processor, the electronic device executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute the method according to any one of claims 1 to 7.

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