Control method and apparatus for vehicle electric compressor, and electronic device

Abstract

Provided are a control method and apparatus for a vehicle electric compressor, and an electronic device. The method comprises: step S110, acquiring a mode switching request and a start state of an electric compressor, the mode switching request comprising a target mode; step S120, if the start state is a non-first-start state, maintaining an off mode for a first preset duration and then switching the working mode of the electric compressor to the target mode; and S130, if the start state is a first-start state, maintaining a standby mode for a second preset duration and then switching to the target mode, the first preset duration being greater than the second preset duration. The method can reduce energy consumption of electric compressors.

Description

Control method, device and electronic equipment for vehicle-mounted electric compressor CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The embodiments of this application are based on and claim the priority of Chinese patent application with application number 202410064553.7 and application date January 16, 2024. The entire contents of the Chinese patent application are hereby introduced into the embodiments of this application as a reference. Technical Field

[0002] The present application relates to the technical field of electric compressors, and in particular to a control method, device, and electronic equipment for a vehicle-mounted electric compressor. Background Art

[0003] Currently, most new energy vehicle air conditioning systems, other than those in conventional vehicles, utilize electric compressors. These compressors not only provide cooling, heating, and electric defrosting, but also cool and heat the high-voltage battery. However, the increased functionality of existing electric compressors leads to complex control schemes, resulting in high energy consumption and low operating efficiency. Summary of the Invention

[0004] Embodiments of the present application provide a control method, device, and electronic equipment for a vehicle-mounted electric compressor, which can reduce the energy consumption of the electric compressor and improve its operating efficiency.

[0005] An embodiment of the present application provides a method for controlling a vehicle-mounted electric compressor, the method comprising:

[0006] Acquiring a mode switching request and a startup state of the electric compressor, wherein the mode switching request includes a target mode;

[0007] If the startup state is not the first startup state, maintaining the shutdown mode for a first preset time and then switching the operating mode of the electric compressor to the target mode;

[0008] If the startup state is the first startup state, then switching to the target mode after maintaining the standby mode for a second preset time period;

[0009] The first preset duration is greater than the second preset duration.

[0010] The present application also provides a control device for a vehicle-mounted electric compressor, comprising:

[0011] a first acquiring module, configured to acquire a mode switching request and a startup state of the electric compressor, wherein the mode switching request includes a target mode;

[0012] a first switching module, configured to switch the operating mode of the electric compressor to the target mode after maintaining the shutdown mode for a first preset time period if the startup state is not the first startup state;

[0013] The second switching module is configured to switch to the target mode after maintaining the standby mode for a second preset time period if the startup state is the first startup state; wherein the first preset time period is greater than the second preset time period.

[0014] The present application also provides an electronic device for a vehicle-mounted electric compressor, including:

[0015] Memory for storing computer programs;

[0016] The processor is configured to implement the above-mentioned control method for the vehicle-mounted electric compressor when executing the computer program stored in the memory.

[0017] An embodiment of the present application provides a control method, device, and electronic device for a vehicle-mounted electric compressor. The method includes: obtaining a mode switching request and a startup state of the electric compressor, wherein the mode switching request includes a target mode; if the startup state is not the first startup state, maintaining the electric compressor in a shutdown mode for a first preset time and then switching the operating mode to the target mode; if the startup state is the first startup state, maintaining the electric compressor in a standby mode for a second preset time and then switching to the target mode. By maintaining the electric compressor in the shutdown mode for a first preset time and then switching to the target mode in the non-first startup state, and maintaining the electric compressor in the standby mode for a second preset time and then switching to the target mode in the first startup state, the above scheme can reduce the energy consumption of the electric compressor and improve its operating efficiency by taking into account the mode switching of the electric compressor in the two startup states. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a first optional flow chart of a method for controlling a vehicle-mounted electric compressor provided in an embodiment of the present application;

[0019] FIG2 is a second optional flow chart of a method for controlling a vehicle-mounted electric compressor provided in an embodiment of the present application;

[0020] FIG3 is a third optional flow chart of a method for controlling a vehicle-mounted electric compressor provided in an embodiment of the present application;

[0021] FIG4 is a fourth optional flow chart of a method for controlling a vehicle-mounted electric compressor provided in an embodiment of the present application;

[0022] FIG5 is a schematic structural diagram of a control device for a vehicle-mounted electric compressor provided in an embodiment of the present application;

[0023] FIG6 is a schematic structural diagram of an electronic device for a vehicle-mounted electric compressor according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the specific technical solutions of the present application will be described in further detail below in conjunction with the accompanying drawings in the embodiments of the present application. The following examples are used to illustrate the present application, but are not intended to limit the scope of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present application. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0025] It should be understood that in the following description, references to "one embodiment," "an embodiment," or "some embodiments" throughout the specification mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, the appearance of "in one embodiment," "in an embodiment," or "some embodiments" throughout the specification does not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments without conflict.

[0026] It should be understood that in the various embodiments of the present application, the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The above sequence numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above description of the various embodiments tends to emphasize the differences between the various embodiments, and the same or similar aspects can refer to each other. For the sake of brevity, this article will not go into details.

[0027] If similar descriptions of "first / second" appear in the application documents, the following explanation is added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0028] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art in the art to which the embodiments of the present application belong. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0029] To facilitate understanding of this solution, before describing the embodiments of the present application, the application background of the embodiments of the present application will be described.

[0030] Traditional air conditioner electric compressors are typically driven by the vehicle engine, while electric compressors are powered by batteries. Since new energy vehicles feature environmentally friendly and energy-saving features like batteries, the use of electric compressors aligns with the environmentally friendly philosophy of new energy vehicles and avoids the impact of electric compressor operation on engine fuel consumption during low-speed driving or idling. As a key component of new energy vehicles, electric compressors hold great promise for development. Compared to traditional air conditioner electric compressors, they are not only more environmentally friendly and energy-efficient, but also more compact and lightweight, quieter in operation, and more convenient to use, better meeting the design concepts and user needs of new energy vehicles.

[0031] FIG1 is a first optional flow chart of a control method for a vehicle-mounted electric compressor provided by an embodiment of the present application. As shown in FIG1 , the present application can be implemented through S110, S120, and S130. Specifically:

[0032] Step S110: Acquire a mode switching request and a startup state of the electric compressor, wherein the mode switching request includes a target mode.

[0033] Here, the mode switching request can be a user-set air conditioning control request or a battery thermal management request generated by the vehicle's battery management system based on the current battery state. For example, the user can set the vehicle's cabin air conditioning cooling or heating requirements using the air conditioning controller, or the battery management system can generate a battery pack heating request based on the current battery state.

[0034] The target mode can be any of the following: air conditioning cooling mode, battery pack cooling mode, air conditioning heating mode, battery pack heating mode, and electric defrost mode. Since the air conditioning cooling temperature is usually lower than the battery pack cooling temperature, and the air conditioning heating temperature is usually higher than the battery pack heating temperature, when there are simultaneous air conditioning and battery pack cooling or heating requests, the air conditioning cooling or heating mode is used.

[0035] The startup state includes a first startup state and a non-first startup state of the electric compressor.

[0036] Step S120: If the startup state is not the first startup state, the operation mode of the electric compressor is switched to the target mode after maintaining the shutdown mode for a first preset time.

[0037] Here, in shutdown mode, the electric compressor is in a power-off state. In a non-initial startup state, the electric compressor operates in any of the following modes: air conditioning cooling mode, battery pack cooling mode, air conditioning heating mode, battery pack heating mode, and electric defrost mode.

[0038] The first preset time is the sum of the time duration for maintaining the shutdown mode and the time duration for the electric compressor to start up to the target mode. For example, the time duration for maintaining the shutdown mode is t1, which is set to 15 seconds (s), and the time duration for the electric compressor to start up to the target mode is t2, which is set to 15 seconds. That is, the first preset time duration is the sum of t1 and t2, which is set to 30 seconds.

[0039] In an embodiment of the present application, in a non-first startup state, by maintaining the electric compressor in a shutdown mode for a first preset time period and then switching to a target mode, the power consumption caused by frequent starting and stopping of the electric compressor will change the load rate and increase power consumption. The above scheme can reduce the power consumption caused by frequent starting and stopping.

[0040] Step S130: If the startup state is the first startup state, maintain the standby mode for a second preset time period and then switch to the target mode; wherein the first preset time period is greater than the second preset time period.

[0041] In the first startup state, the electric compressor switches from shutdown mode to standby mode. In standby mode, the electric compressor is in a state of low energy consumption. It is a transition state for the electric compressor to switch from the first startup to the target mode, which can be a switching mode.

[0042] The second preset time duration is the time duration for the electric compressor to start and switch to the target mode. For example, the time duration for the electric compressor to start and switch to the target mode is t2, which is set to 15 seconds, that is, the second preset time duration is 15 seconds. Since the first preset time duration is the sum of the time duration for maintaining the shutdown mode and the time duration for the electric compressor to start and switch to the target mode, and the second preset time duration is the time duration for the electric compressor to start and switch to the target mode, the first preset time duration is greater than the second preset time duration.

[0043] In an embodiment of the present application, in the first startup state, by maintaining the electric compressor in standby mode for a second preset time period and then switching to the target mode, the electric compressor can be kept in a lower energy consumption state and the working efficiency of the electric compressor can also be improved.

[0044] In an embodiment of the present application, by maintaining the electric compressor in the shutdown mode for a first preset period of time and then switching to the target mode in a non-first startup state, and maintaining the electric compressor in the standby mode for a second preset period of time and then switching to the target mode in the first startup state, taking into account the mode switching of the electric compressor in the two startup states, the above scheme can reduce the energy consumption of the electric compressor and improve the operating efficiency.

[0045] After “switching to the target mode” in step S120 or S130, the following steps are further included:

[0046] Step 121: Based on the pressure value and / or temperature value of the electric compressor in the target mode, determine whether the electric compressor reaches a preset compressor protection condition, wherein the preset compressor protection condition includes at least one of the following: the high-pressure value of the electric compressor is greater than the high-pressure threshold, the low-pressure value of the electric compressor is less than the low-pressure threshold, the ratio of the high-pressure value to the low-pressure value is greater than the proportional threshold, and the high-pressure temperature value of the electric compressor is greater than the first temperature threshold.

[0047] After the electric compressor has been running in the target mode for a period of time, it can compress the gas to a higher pressure so that the heat released by the gas during movement is absorbed and transferred, and then the gas pressure is reduced to the required range. During the running time period, when the pressure value of the electric compressor is greater than or equal to the pressure threshold, the high-pressure pressure value of the electric compressor can be obtained through the pressure sensor. When the pressure value of the electric compressor is less than the pressure threshold, the low-pressure pressure value of the electric compressor can be obtained through the pressure sensor. When the electric compressor is at high pressure, the high-pressure temperature value can be obtained through the temperature sensor. If the pressure value and / or temperature value of the electric compressor reaches the preset compressor protection condition, the electric compressor needs to be shut down for protection.

[0048] The preset compressor protection condition can be at least one of the following conditions: the high pressure value of the electric compressor is greater than the high pressure threshold, the low pressure value of the electric compressor is less than the low pressure threshold, the ratio of the high pressure value to the low pressure value is greater than the ratio threshold, and the high pressure temperature value of the electric compressor is greater than the first temperature threshold.

[0049] Here, the high pressure threshold, the low pressure threshold, the ratio threshold, and the first temperature threshold are set according to the actual working condition of the electric compressor in the target mode.

[0050] Step 122: After maintaining the target mode for a third preset time, set the electric compressor to the shutdown mode.

[0051] Here, the third preset time length can be set based on user needs. For example, the third preset time length can be set to 3 seconds.

[0052] In an embodiment of the present application, based on the pressure value and / or temperature value of the electric compressor in the target mode, it is determined whether the electric compressor has reached the preset electric compressor protection condition, and the electric compressor is shut down for protection, which can avoid damage to the electric compressor and thus extend the life of the electric compressor.

[0053] After “switching to the target mode” in step S120 or S130, the following steps are further included:

[0054] Step 123: In response to the acquired shutdown request, acquire the operating time of the electric compressor in the target mode.

[0055] Step 124: If it is determined that the running time is greater than the time threshold, set the electric compressor to the shutdown mode.

[0056] When the electric compressor receives a shutdown request, it determines whether the operating time in the current mode is greater than a time threshold to prevent increased power consumption due to frequent mode switching. If this is the case, the electric compressor is set to shutdown mode. If the operating time in the current mode is less than the time threshold, the compressor continues to operate in the current mode until the operating time exceeds the time threshold. The time threshold is the minimum startup time, which can be set by the user based on actual needs; for example, it can be set to 15 seconds.

[0057] In an embodiment of the present application, in response to an acquired shutdown request, the electric compressor is set to shutdown mode by determining that the operating time of the electric compressor in the target mode is greater than a time threshold. This can reduce the consumption caused by frequent starting of the electric compressor, thereby extending the life of the electric compressor.

[0058] The control method of the vehicle-mounted electric compressor further includes the following steps:

[0059] Step 125: When the target mode is the standby mode, set the rotation speed of the electric compressor to a first preset rotation speed.

[0060] Here, the speed control in the standby mode is a transition state of the switching mode, which keeps the electric compressor operating at a relatively low first preset speed, for example, 1500 revolutions per minute (rpm).

[0061] Step 126: When the target mode is the electric defrost mode, set the rotation speed of the electric compressor to a second preset rotation speed.

[0062] Here, the speed control in the electric defrost mode can keep the electric compressor operating at a relatively high second preset speed, such as 5000 rpm.

[0063] Since the first preset rotational speed is the rotational speed in the standby mode and needs to be kept at a relatively low rotational speed, the first preset rotational speed is smaller than the second preset rotational speed.

[0064] Step 127: When the target mode is the shutdown mode, set the speed of the electric compressor to a null value.

[0065] Here, since the electric compressor in the shutdown mode is in an unpowered state, the rotation speed is a null value.

[0066] The control method of the vehicle-mounted electric compressor further includes the following steps:

[0067] Step 128 : When the target mode is any one of the air conditioning cooling mode, the battery pack cooling mode, the air conditioning heating mode, and the battery pack heating mode, determine whether the electric compressor reaches a speed degradation condition based on the pressure value of the electric compressor.

[0068] When the target mode is any one of the air-conditioning cooling mode, the battery pack cooling mode, the air-conditioning heating mode and the battery pack heating mode, the speed of the electric compressor is controlled by a speed control method with pre-adjustment. Here, the pre-adjusted speed control method can be a Proportional Integration Differentiation (PID) control algorithm. The PID control algorithm includes three parameters: P, I, and D, which represent the proportional coefficient, integral time, and differential time, respectively. The specific settings can be adjusted according to actual conditions.

[0069] Here, the speed reduction condition includes at least one of the following conditions: a high-pressure value of the electric compressor is greater than the difference between a high-pressure threshold and a first control parameter; a low-pressure value of the electric compressor is less than the sum of a low-pressure threshold and a second control parameter; and a ratio of the high-pressure value to the low-pressure value of the electric compressor is greater than the difference between a ratio threshold and a third control parameter. The first control parameter, the second control parameter, and the third control parameter are control parameters set according to a target mode of the electric compressor.

[0070] When it is determined that the electric compressor reaches the speed degradation condition and enters the speed degradation area, the speed decreases at a certain rate, for example, 100 revolutions per second, to the speed degradation target speed.

[0071] Step 129: When the speed of the electric compressor is reduced until the pre-speed control condition is met, it is determined that the first speed range has been entered.

[0072] Here, the pre-speed control condition includes at least one of the following conditions: the high-pressure value of the electric compressor is greater than the difference between the high-pressure threshold and the fourth control parameter, the low-pressure value of the electric compressor is less than the sum of the low-pressure threshold and the fifth control parameter, and the ratio of the high-pressure value to the low-pressure value of the electric compressor is greater than the difference between the ratio threshold and the sixth control parameter. The fourth, fifth, and sixth control parameters are control parameters set according to a target mode of the electric compressor, the fourth control parameter corresponds to the first control parameter and is greater than or equal to the first control parameter, the fifth control parameter corresponds to the second control parameter and is greater than or equal to the second control parameter, and the sixth control parameter corresponds to the third control parameter and is greater than or equal to the third control parameter.

[0073] Figure 2 is a second optional flow chart of a control method for a vehicle-mounted electric compressor provided in an embodiment of the present application; as shown in Figure 2, in some embodiments of the present application, after the above step 129 "when the speed of the electric compressor is reduced until the pre-speed control condition is met, it is determined to enter the first speed range", the following steps are also included, which can be specifically implemented through S210 and S220.

[0074] Step S210: Based on the current speed of the electric compressor, the target speed, and a preset error corresponding to the target mode, a preset speed regulation algorithm is used to determine a second speed range of the electric compressor.

[0075] Step S220: Adjust the electric compressor to operate in a second speed range.

[0076] Here, by inputting the current speed, target speed and preset error corresponding to the target mode of the electric compressor into the preset speed regulation algorithm (PID control algorithm), the second speed range of the electric compressor can be obtained, wherein the preset error is specifically set according to the target mode, and the speed range of the first speed range is greater than that of the second speed range.

[0077] For example, the speed control in the air conditioning cooling mode adopts a PID control method with pre-adjustment. According to the user's air conditioning temperature setting and ambient temperature information, the air conditioning controller will calculate the target temperature of the evaporator, and obtain the target temperature T1 of the evaporator from the air conditioning controller through communication. pc , where pc represents the air conditioning cooling mode, and the actual temperature of the evaporator is T2 pc, collected by a temperature sensor, if the pressure meets one of the following speed degradation conditions: the high-pressure pressure is greater than the difference between HighPressThreshold (high-pressure threshold) and P1 (the first control parameter); or the low-pressure pressure is less than the sum of LowPressThreshold (low-pressure threshold) and P2 (the second control parameter); or the ratio of the high-pressure pressure to the low-pressure pressure is greater than the difference between DiffPressThreshold (ratio threshold) and K1 (the third control parameter); then it enters the speed degradation region. If the pressure meets the following conditions: the high-pressure pressure is less than the difference between HighPressThreshold and P3 (the fourth control parameter); or the low-pressure pressure > the sum of LowPressThreshold and P4 (the fifth control parameter); or the ratio of the high-pressure pressure to the low-pressure pressure < the difference between DiffPressThreshold and K2 (the sixth control parameter); where P3 is greater than or equal to P1, P4 is greater than or equal to P2, and K2 is greater than or equal to K1, and the specific values are calibrated according to the actual situation. Then, after leaving the speed degradation safe region, it enters the pre-speed control, according to the evaporator target temperature T1 pc Look up the target speed in the table, and adjust the speed of the electric compressor according to the PID algorithm to more accurately follow the target speed. Among them, the error input of PID is T1 pc and T2 pc The difference; PID control parameters: P pc , I pc , D pc Calibrated according to the actual experimental situation.

[0078] Exemplarily, for the speed control in the battery pack refrigeration mode, a PID control method with pre-regulation is adopted. The battery management system calculates the target coolant temperature T1 according to the actual working conditions bc , where bc represents the battery pack refrigeration mode, and the actual temperature T2 of the coolant bc Collected by a temperature sensor, if the pressure meets the following speed degradation conditions, it enters the speed degradation region. If the pressure meets the pre-speed control conditions, after leaving the speed degradation safe region, it enters the pre-speed control, according to the target coolant temperature T1 bc Look up the target speed in the table, and adjust the speed of the electric compressor according to the PID algorithm to more accurately follow the target speed. Among them, the error input of PID is T1 bc and T2 bc The difference; PID control parameters: P bc , I bc , D bc Calibrated according to the actual experimental situation.

[0079] For example, the speed control in the air conditioning heating mode adopts a PID control method with pre-adjustment. According to the user's air conditioning temperature setting and ambient temperature information, the air conditioning controller will calculate the target high pressure of the electric compressor, and obtain the target high pressure pressure P1 of the electric compressor from the air conditioning controller through communication. ph , where ph represents the air conditioning heating mode, and the actual high pressure of the electric compressor P2 ph Through the pressure sensor, if the pressure meets the following speed reduction conditions, it enters the speed reduction area. If the pressure meets the pre-speed control conditions, it leaves the speed reduction safety area and enters the pre-speed control, according to the target high pressure P1 of the electric compressor ph The target speed is obtained by looking up the table, and the electric compressor speed is adjusted according to the PID algorithm to more accurately follow the target speed. The error input of PID is P1 ph With P2 ph The difference between the two; PID control parameters: P ph , I ph 、D ph Calibrate according to actual experimental conditions.

[0080] For example, the speed control in the battery pack heating mode adopts a PID control method with pre-adjustment. The battery management system calculates the target coolant temperature according to the actual working conditions, and obtains the target high pressure P1 of the electric compressor according to the target coolant temperature. bh , where bh represents the battery pack heating mode and the actual high pressure P2 of the electric compressor bh Through the pressure sensor, if the pressure meets the following speed reduction conditions, it enters the speed reduction area. If the pressure meets the pre-speed control conditions, it leaves the speed reduction safety area and enters the pre-speed control, according to the target high pressure P1 of the electric compressor bh The target speed is obtained by looking up the table, and the electric compressor speed is adjusted according to the PID algorithm to more accurately follow the target speed. The error input of PID is P1 bh With P2 bh The difference between the two; PID control parameters: P bh , I bh 、D bh Calibrate according to actual experimental conditions.

[0081] In an embodiment of the present application, by determining the second speed range of the electric compressor and adjusting the electric compressor to operate in the second speed range, the time for adjusting the speed of the electric compressor to the target speed can be saved, thereby reducing the energy consumption of the electric compressor.

[0082] The control method of the vehicle-mounted electric compressor further includes the following steps:

[0083] Step 140: When it is determined that the rotation speed of the electric compressor is less than a third preset rotation speed and has been running for a third preset time period, the electric compressor is switched to an oil return protection state.

[0084] The oil return protection state is the process whereby oil flows through the electric compressor and then back to the fuel tank via an oil return valve connected to the electric compressor. During operation, some lubricant may evaporate or be lost. The oil return protection state ensures that the electric compressor always has stable lubrication, allowing for smoother operation and reducing unnecessary failures. The third preset speed is the speed of the electric compressor that triggers the oil return protection, for example, 1500 rpm, and the third preset duration is the duration for which the oil return protection is triggered.

[0085] Step 150: In the oil return protection state, after increasing the speed of the electric compressor to a fourth preset speed and running for a fourth preset time, adjust the electric compressor to operate in a target mode; wherein the third preset speed is less than the fourth preset speed.

[0086] After the oil return protection is completed, the electric compressor will be adjusted to operate in the target mode. Here, the fourth preset speed is the oil return speed of the oil return protection electric compressor, for example, 1800 rpm, and the fourth preset time is the oil return time of the oil return protection electric compressor, for example, 60 s.

[0087] In the embodiment of the present application, the oil return protection of the electric compressor can reduce the energy consumption of the electric compressor, optimize the performance of the electric compressor, avoid damage and restriction of the electric compressor due to lack of oil, increase the service life of the electric compressor, and reduce the shutdown and maintenance costs of the electric compressor.

[0088] The control method of the vehicle-mounted electric compressor further includes the following steps:

[0089] Step 160 : When it is determined that the first current temperature of the evaporator connected to the electric compressor is less than the second temperature threshold and the electric compressor has been running for a fifth preset time period, reduce the electric compressor to a fifth preset speed.

[0090] Step 170 : While maintaining the fifth preset speed, when it is determined that the second current temperature of the evaporator is less than the third temperature threshold and the electric compressor continues to operate for a sixth preset time, set the electric compressor to a shutdown mode.

[0091] Step 180: When it is determined that the second current temperature of the evaporator is greater than or equal to a third temperature threshold, adjust the electric compressor to operate in a target mode; wherein the second temperature threshold is less than or equal to the third temperature threshold.

[0092] The evaporator is a low-pressure component installed between the capillary tube and the suction port of the electric compressor to cool the air. The electric compressor can absorb the low-pressure and low-temperature steam from the evaporator. When the temperature of the evaporator is too low, frost or even ice will appear. When ice occurs, it will cause poor air circulation and even cause the air conditioning system to malfunction. Therefore, it is necessary to reduce the speed of the electric compressor to protect the evaporator from frost.

[0093] Here, the second temperature threshold is the second temperature threshold at which frost or ice forms on the evaporator, for example, -2 degrees Celsius (°C). The fifth preset duration is the time during which the electric compressor operates in the current mode and the evaporator temperature is below the second temperature threshold, for example, 30 seconds. The third temperature threshold is the third temperature threshold at which frost or ice still forms on the evaporator even after the electric compressor speed decreases, for example, 0°C, where the second temperature threshold is less than or equal to the third temperature threshold.

[0094] For example, when the first current temperature of the evaporator is -5°C and the second temperature threshold is -2°C, since the first current temperature is less than the second temperature threshold, the speed of the electric compressor is reduced, and the temperature of the evaporator will rise. If the second current temperature of the evaporator obtained is -3°C and the third temperature threshold is 0°C, since the second current temperature is less than the third temperature threshold, the electric compressor is switched to the shutdown mode. If the second current temperature of the evaporator obtained is 2°C, since the second current temperature is greater than the third temperature threshold, the electric compressor is adjusted to operate in the target mode.

[0095] In the embodiment of the present application, by adjusting the rotation speed of the electric compressor to protect the evaporator from frost, the normal operation of the evaporator and the air conditioner can be ensured and the life of the air conditioner can be extended.

[0096] The control method of the vehicle-mounted electric compressor further includes the following steps:

[0097] The speed of the electric compressor that causes vehicle resonance is reduced to reduce vehicle noise.

[0098] In the embodiment of the present application, by reducing the rotation speed of the electric compressor that causes vehicle resonance, the noise caused by the rotation speed of the electric compressor can be reduced, giving customers a good driving experience.

[0099] At present, most of the air-conditioning systems of new energy vehicles other than traditional vehicles adopt the solution of electric compressors. Compared with the solution of mechanical electric compressors, the biggest advantage is that it can cool or pump heat without starting the engine, which provides a better user experience. In order to reduce components and reduce manufacturing costs, new energy vehicles use electric compressors not only for passenger air conditioning cooling, heating, and electric defrosting functions, but also for cooling and heating high-voltage batteries. Due to the increase in functions, the control becomes complicated. For example, it is necessary to consider the switching between different working modes of the electric compressor, speed control under different working modes, electric compressor pressure protection, speed degradation control, speed PID control, electric compressor oil return protection, evaporator frost protection, noise reduction processing, etc. Due to the complexity of control, the energy consumption of the electric compressor is large and the operating efficiency is low. Based on the above problems, the embodiment of the present application provides a control method for a vehicle-mounted electric compressor, which can reduce the energy consumption of the electric compressor and improve the operating efficiency.

[0100] The following describes an exemplary application of the embodiments of the present application in a practical application scenario.

[0101] FIG3 is a third optional flow chart of a control method for a vehicle-mounted electric compressor provided in an embodiment of the present application. As shown in FIG3 , in some embodiments of the present application, a specific vehicle-mounted electric compressor mode switching control method includes the following steps:

[0102] Step S301: Enter shutdown mode.

[0103] In an embodiment of the present application, the electric compressor enters an off mode in an initial state.

[0104] Step S302: Determine whether there is a mode switching request.

[0105] Here, if yes, execute step S303, if no, execute step S301.

[0106] Step S303: Determine whether it is the first startup.

[0107] If it is determined that there is a mode switching request, it is determined whether the electric compressor is started for the first time. If so, step S304 is executed; if not, step S306 is executed.

[0108] Step S304: Maintain the standby mode for a duration of t2.

[0109] When the electric compressor is started for the first time, the standby mode is maintained for a time period t2, where t2 is a second preset time period.

[0110] Step S305: Entering the air conditioning cooling mode, the battery pack cooling mode, the air conditioning heating mode, the battery pack heating mode, or the electric defrost mode according to the mode request.

[0111] When the target mode of the mode request is any one of the following modes: air conditioning cooling mode, battery pack cooling mode, air conditioning heating mode, battery pack heating mode, electric defrost mode, the electric compressor is switched to the mode corresponding to the target mode.

[0112] Step S306: Maintain the shutdown mode for a duration of t1.

[0113] When the electric compressor is not started for the first time, after maintaining the shutdown mode for t1, step S304 is executed, that is, continuing to maintain the standby mode for t2, where the sum of t1 and t2 is the first preset time.

[0114] Step S307: Determine whether there is a mode switching request.

[0115] After the electric compressor operates in the target mode, it is determined whether there is a mode switching request. If so, step S304 is executed.

[0116] Step S308: Determine whether there is a shutdown request.

[0117] Determine whether the electric compressor receives a shutdown request. If so, execute step S309.

[0118] Step S309: Determine whether the running time is greater than the time threshold.

[0119] In response to the obtained shutdown request of the electric compressor, the operating time of the electric compressor in the target mode is obtained, and it is determined whether the operating time is greater than a time threshold. If so, step S301 is executed.

[0120] Step S310: Determine whether the compressor protection is reached.

[0121] Based on the pressure value and / or temperature value of the electric compressor, it is determined whether the electric compressor reaches the electric compressor protection state. If so, step S301 is executed.

[0122] FIG4 is a fourth optional flow chart of a method for controlling a vehicle-mounted electric compressor provided in an embodiment of the present application. As shown in FIG4 , in some embodiments of the present application, the speed control of the vehicle-mounted electric compressor in different modes includes the following steps:

[0123] Step S401, shutdown mode: null value.

[0124] When the mode of the electric compressor is the off mode, the speed of the electric compressor is a null value.

[0125] Step S402, standby mode: first preset speed.

[0126] When the mode of the electric compressor is the standby mode, the rotation speed of the electric compressor is a first preset rotation speed.

[0127] Step S403: Electric defrost mode: second preset speed.

[0128] When the mode of the electric compressor is the electric defrost mode, the rotation speed of the electric compressor is a second preset rotation speed.

[0129] Step S404: air conditioning cooling mode or battery pack cooling mode or air conditioning heating mode or battery pack heating mode.

[0130] When the mode of the electric compressor is any one of the following modes: air conditioning cooling mode, battery pack cooling mode, air conditioning heating mode, battery pack heating mode, the speed control of the electric compressor executes step S405.

[0131] Step S405: Whether the speed degradation condition is met.

[0132] Based on the high-pressure value and the low-pressure value of the electric compressor in the current mode, it is determined whether the speed degradation condition is met. If so, step S406 is executed; if not, step S408 is executed.

[0133] Step S406: Enter the speed degradation area.

[0134] When the electric compressor enters the speed degradation region (the first speed interval), the speed of the electric compressor decreases at a certain rate to the speed degradation target speed.

[0135] Step S407: Whether the pre-speed control condition is met.

[0136] Based on the high pressure value and the low pressure value of the electric compressor in the current mode, it is determined whether the pre-speed control condition is met. If so, step S408 is executed; if not, step S406 is executed.

[0137] Step S408: Enter pre-speed control.

[0138] After leaving the speed reduction area, it enters the pre-speed control (second speed range).

[0139] Step S409: PID speed control.

[0140] In an embodiment of the present application, in the pre-speed control region, the speed of the electric compressor is adjusted according to the PID algorithm to more accurately follow the target speed.

[0141] Based on the control method of the vehicle-mounted electric compressor of the above embodiment, the embodiment of the present application further provides a control device for the vehicle-mounted electric compressor, as shown in FIG5 , the control device 5 includes:

[0142] The first acquisition module 501 is configured to acquire a mode switching request and a startup state of the electric compressor, wherein the mode switching request includes a target mode.

[0143] The first switching module 502 is configured to switch the working mode of the electric compressor to the target mode after maintaining the shutdown mode for a first preset time period if the startup state is not the first startup state.

[0144] The second switching module 503 is configured to, if the startup state is the first startup state, maintain the standby mode for a second preset time period and then switch to the target mode.

[0145] In some embodiments, the device also includes a first determination module and a first setting module, wherein the first determination module is used to determine whether the electric compressor reaches a preset electric compressor protection condition based on the pressure value and / or temperature value of the electric compressor under the target mode, wherein the preset electric compressor protection condition includes at least one of the following: the high pressure value of the electric compressor is greater than the high pressure threshold, the low pressure value of the electric compressor is less than the low pressure threshold, the ratio of the high pressure value to the low pressure value is greater than the proportional threshold, and the high pressure temperature value of the electric compressor is greater than the first temperature threshold; the first setting module is used to set the electric compressor to the shutdown mode after maintaining the target mode for a third preset time period.

[0146] In some embodiments, the device also includes a second acquisition module and a second setting module, wherein the second acquisition module is used to obtain the operating time of the electric compressor in the target mode in response to the acquired shutdown request; and the second setting module is used to set the electric compressor to the shutdown mode when it is determined that the operating time is greater than a time threshold.

[0147] In some embodiments, the device further includes a third setting module, a fourth setting module and a fifth setting module, wherein the third setting module is used to set the speed of the electric compressor to a first preset speed when the target mode is the standby mode; the fourth setting module is used to set the speed of the electric compressor to a second preset speed when the target mode is the electric defrost mode; the fifth setting module is used to set the speed of the electric compressor to an empty value when the target mode is the shutdown mode; wherein the first preset speed is less than the second preset speed.

[0148] In some embodiments, the device also includes a second determination module and a third determination module, wherein the second determination module is used to determine whether the electric compressor reaches the speed degradation condition based on the pressure value of the electric compressor when the target mode is any one of the air-conditioning cooling mode, the battery pack cooling mode, the air-conditioning heating mode and the battery pack heating mode; and the third determination module is used to determine that the first speed range is entered when the speed of the electric compressor is reduced until the pre-speed control condition is met.

[0149] In some embodiments, the device also includes a fourth determination module and a first adjustment module, wherein the fourth determination module is used to determine the second speed range of the electric compressor based on the current speed of the electric compressor, the target speed and the preset error corresponding to the target mode using a preset speed control algorithm; the first adjustment module is used to adjust the electric compressor to operate in the second speed range; wherein the speed range of the first speed range is greater than the second speed range.

[0150] In some embodiments, the device also includes a third switching module and a second adjustment module, wherein the third switching module is used to switch the electric compressor to an oil return protection state when it is determined that the speed of the electric compressor is less than a third preset speed and has been running for a third preset time; the second adjustment module is used to increase the speed of the electric compressor to a fourth preset speed and run for a fourth preset time in the oil return protection state, and then adjust the electric compressor to operate in the target mode; wherein the third preset speed is less than the fourth preset speed.

[0151] In some embodiments, the device further includes a reduction module, a fourth setting module and a third adjustment module, wherein the reduction module is used to reduce the speed of the electric compressor to a fifth preset speed when it is determined that the first current temperature of the evaporator connected to the electric compressor is less than the second temperature threshold and the electric compressor has been running for a fifth preset time; the fourth setting module is used to set the electric compressor to a shutdown mode when it is determined that the second current temperature of the evaporator is less than the third temperature threshold and the electric compressor has been running for a sixth preset time while maintaining the fifth preset speed; the third adjustment module is used to adjust the electric compressor to operate in the target mode when it is determined that the second current temperature of the evaporator is greater than or equal to the third temperature threshold; wherein the second temperature threshold is less than or equal to the third temperature threshold.

[0152] When performing the control method of the vehicle-mounted electric compressor of the above embodiment, only the division of the above program modules is used as an example. In actual application, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the control device for the vehicle-mounted electric compressor provided in the above embodiment and the control method embodiment of the vehicle-mounted electric compressor belong to the same concept. The specific implementation process and beneficial effects are detailed in the method embodiment, which will not be repeated here. For technical details not disclosed in the embodiment of this device, please refer to the description of the method embodiment of this application for understanding.

[0153] Based on the control method of the vehicle-mounted electric compressor of the above-mentioned embodiment, the embodiment of the present application also provides an electronic device of a vehicle-mounted electric compressor, as shown in Figure 6, the electronic device 6 includes: a processor 601 and a memory 602, the memory 602 stores one or more programs executable by the processor, and when one or more programs are executed, the control method of the vehicle-mounted electric compressor of any of the embodiments described above can be executed by the processor 601.

[0154] In the embodiments of the present application, the processor 601 may be at least one of an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a controller, a microcontroller, and a microprocessor. It is understood that for different devices, the electronic device used to implement the functions of the processor may also be other, and the embodiments of the present application do not specifically limit this.

[0155] In the embodiment of the present application, the above-mentioned memory includes various media that can store program codes, such as mobile storage devices, read-only memory (ROM), magnetic disks or optical disks, and can also be other media, which are not specifically limited in the embodiment of the present application.

[0156] For example, the program instructions corresponding to the control method of a vehicle-mounted electric compressor in this embodiment can be stored on a storage medium such as a CD, a hard disk, or a USB flash drive. When the program instructions corresponding to the control method of a vehicle-mounted electric compressor in the memory are read or executed by an electronic device, the control method of the vehicle-mounted electric compressor as described in any of the above embodiments can be implemented.

[0157] Those skilled in the art will understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above method embodiments.

[0158] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage) containing computer-usable program code.

[0159] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0160] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0161] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0162] The above is merely an implementation of the embodiments of the present application, but the scope of protection of the embodiments of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the embodiments of the present application. Therefore, the scope of protection of the embodiments of the present application should be based on the scope of protection of the claims.

Claims

1. A control method for an in-vehicle electric compressor, which is applied to an electronic device of a vehicle. The method includes: Obtaining a mode switching request and a startup status of the electric compressor, where the mode switching request includes a target mode; If the startup status is a non-first startup status, maintain the shutdown mode for a first preset duration and then switch the working mode of the electric compressor to the target mode; If the startup status is a first startup status, maintain the standby mode for a second preset duration and then switch to the target mode; Wherein, the first preset duration is greater than the second preset duration.

2. The method according to claim 1, wherein After switching to the target mode, the method further includes: Based on the pressure value and / or temperature value of the electric compressor in the target mode, determining that the electric compressor meets a preset compressor protection condition, where the preset compressor protection condition includes at least one of the following: the high-pressure pressure value of the electric compressor is greater than a high-pressure threshold, the low-pressure pressure value of the electric compressor is less than a low-pressure threshold, the ratio of the high-pressure pressure value to the low-pressure pressure value is greater than a ratio threshold, and the high-pressure temperature value of the electric compressor is greater than a first temperature threshold; After maintaining the target mode for a third preset duration, set the electric compressor to the shutdown mode.

3. The method according to claim 1, wherein After switching to the target mode, the method further includes: In response to an obtained shutdown request, obtaining the running time of the electric compressor in the target mode; When it is determined that the running time is greater than a time threshold, set the electric compressor to the shutdown mode.

4. The method according to claim 1, wherein The method further includes: When the target mode is the standby mode, set the rotation speed of the electric compressor to a first preset rotation speed; When the target mode is the electric defrosting mode, set the rotation speed of the electric compressor to a second preset rotation speed; When the target mode is the shutdown mode, set the rotation speed of the electric compressor to a null value; Wherein, the first preset rotation speed is less than the second preset rotation speed.

5. The method according to claim 1, wherein The method further includes: When the target mode is any one of the air-conditioning refrigeration mode, the battery pack refrigeration mode, the air-conditioning heating mode, and the battery pack heating mode, determining that the electric compressor meets a speed reduction condition based on the pressure value of the electric compressor; When reducing the rotation speed of the electric compressor until a pre-rotation speed control condition is met, determining to enter a first rotation speed range.

6. The method according to claim 5, wherein, After entering the first rotation speed range, the method further includes: Based on the current rotation speed, target rotation speed of the electric compressor, and a preset error corresponding to the target mode, using a preset speed regulation algorithm to determine a second rotation speed range of the electric compressor; Adjust the electric compressor to operate in the second rotation speed range; Wherein, the rotation speed range of the first rotation speed range is greater than that of the second rotation speed range.

7. The method according to any one of claims 1 to 6, wherein, The method further includes: When it is determined that the rotation speed of the electric compressor is less than a third preset rotation speed and continuously runs for a third preset duration, switch the electric compressor to an oil return protection state; In the oil return protection state, after increasing the rotational speed of the electric compressor to a fourth preset rotational speed and operating for a fourth preset duration, adjust the electric compressor to operate in the target mode; Wherein, the third preset rotational speed is less than the fourth preset rotational speed.

8. The method according to any one of claims 1 to 6, wherein, The method further includes: When it is determined that the first current temperature of the evaporator connected to the electric compressor is less than a second temperature threshold and the electric compressor continuously operates for a fifth preset duration, reduce the electric compressor to operate at a fifth preset rotational speed; When it is determined that the second current temperature of the evaporator is less than a third temperature threshold and the electric compressor continuously operates for a sixth preset duration while maintaining the fifth preset rotational speed, set the electric compressor to the shutdown mode; When it is determined that the second current temperature of the evaporator is greater than or equal to the third temperature threshold, adjust the electric compressor to operate in the target mode; Wherein, the second temperature threshold is less than or equal to the third temperature threshold.

9. A control device for a vehicle-mounted electric compressor, wherein, Including: A first acquisition module, configured to acquire a mode switching request and a startup state of the electric compressor, wherein the mode switching request includes a target mode; A first switching module, configured to, if the startup state is a non-first startup state, maintain the shutdown mode for a first preset duration and then switch the operating mode of the electric compressor to the target mode; A second switching module, configured to, if the startup state is a first startup state, maintain the standby mode for a second preset duration and then switch to the target mode; wherein, the first preset duration is greater than the second preset duration.

10. An electronic device of an in-vehicle electric compressor, comprising: A memory, configured to store a computer program; A processor, configured to implement the method according to any one of claims 1 to 8 when executing the computer program stored in the memory.

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