A vehicle compressor rotating speed control method, device and vehicle

Abstract

The application provides a vehicle compressor rotating speed control method and device, and a vehicle, and applies to the technical field of compressor rotating speed control. The method comprises the following steps: acquiring state parameter information of a target device; determining a reference rotating speed of a compressor and a correction coefficient of the rotating speed of the compressor according to the state parameter information of the target device; correcting the reference rotating speed of the compressor based on the correction coefficient of the rotating speed of the compressor to obtain a target rotating speed of the compressor; and controlling the compressor to operate according to the target rotating speed. Through dynamic correction of the rotating speed of the compressor, the compressor high temperature can be avoided while the refrigeration performance is maintained stable, and the reliability and energy efficiency of the whole vehicle thermal management system are improved.

Description

Technical Field

[0001] This application relates to the field of compressor speed control technology, specifically to a vehicle compressor speed control method, device, and vehicle. Background Technology

[0002] In the thermal management system of new energy vehicles, the compressor is not only the sole source of cooling capacity for the air conditioning system but also one of the largest energy consumers in the vehicle. The compressor's rotational speed is a direct reflection of the cooling capacity and energy consumption of the air conditioning system. Therefore, the compressor speed is not only a switch for cooling capacity but also an energy valve in the thermal management system. The compressor speed determines the heat transfer rate of the three major cooling circuits—battery, motor, and passenger compartment—directly affecting battery range, battery and compressor safety and lifespan. Therefore, precise control of the compressor speed is of paramount importance.

[0003] Currently, the compressor speed control in vehicle air conditioning and thermal management systems primarily generates cooling capacity requests based on load factors such as target cabin temperature, ambient temperature, lighting conditions, interior temperature, and fan speed setting, with insufficient attention paid to the compressor's thermal safety. When the compressor operates at high speed and the evaporator has a high superheat, the temperature on the compressor's exhaust side and power module can rise rapidly. Although existing compressors typically have device-level over-temperature protection, once triggered, they will passively reduce to a constant low speed, causing a sharp drop in cooling capacity. This will affect passenger comfort and battery thermal management. If the compressor operates under high load for extended periods, frequent triggering of the compressor's high-temperature protection will not only impact cooling performance but also shorten the compressor's lifespan.

[0004] Therefore, there is a need to provide a compressor speed control method that can monitor and dynamically correct the compressor's operating status in real time. Summary of the Invention

[0005] In view of this, this application provides a vehicle compressor speed control method, device, and vehicle, which solves the technical problem that the current system cannot automatically adjust the speed according to the thermal state, causing the compressor to easily operate at high speed and the evaporator to be in a high superheat range, resulting in a decrease in energy efficiency ratio and temperature overshoot.

[0006] As a first aspect of this application, this application provides a method for controlling the speed of a vehicle compressor, comprising: Obtain the status parameter information of the target device; Based on the status parameter information of the target device, determine the reference speed of the compressor and the correction coefficient of the compressor speed; The compressor's reference speed is corrected based on the compressor speed correction coefficient to obtain the compressor's target speed; The compressor is controlled to operate according to the target speed.

[0007] Optionally, based on the state parameter information of the target device, a correction coefficient for the compressor speed is determined, including: Based on the status parameter information of the target device, determine the temperature correction coefficient and temperature correction coefficient calculation frequency of the compressor speed, the pressure correction coefficient and pressure correction frequency of the compressor speed, and the first correction coefficient; The temperature correction factor is used to calculate the frequency of the compressor speed adjustment, and the pressure correction factor is used to calculate the frequency of the compressor speed adjustment.

[0008] Optionally, the status parameter information of the target device includes: the target temperature and current temperature of the cab, the air conditioning fan speed setting, and the evaporator temperature information; Based on the status parameter information of the target device, the reference speed of the compressor is determined, including: Calculate the first reference speed of the compressor based on the target temperature and the current temperature of the cab; The second reference speed of the compressor is determined based on the air volume setting of the air conditioner; Based on the temperature information of the evaporator, calculate the third reference speed of the compressor; The reference speed of the compressor is determined based on the first reference speed, the second reference speed, and the third reference speed of the compressor.

[0009] Optionally, the status parameter information of the target device includes: the temperature information of the evaporator and the operating parameter information of the compressor; The temperature correction factor for the compressor speed includes a first temperature correction factor and a second temperature correction factor for the compressor speed. The temperature correction factor calculation frequency includes the first temperature correction factor calculation frequency and the second temperature correction factor calculation frequency for compressor speed. Based on the status parameter information of the target device, determine the temperature correction coefficient for the compressor speed and the calculation frequency of the temperature correction coefficient, including: Based on the temperature information of the evaporator, determine the first temperature correction coefficient for the compressor speed and the calculation frequency of the first temperature correction coefficient; Based on the compressor's operating parameter information, determine the second temperature correction coefficient for the compressor speed and the second temperature correction coefficient calculation frequency; The temperature correction factor for the compressor speed is adjusted based on the calculated frequency of the temperature correction factor for the compressor speed, including: The first temperature correction factor for the compressor speed is adjusted based on the first temperature correction factor for the compressor speed. The second temperature correction factor for the compressor speed is calculated based on the second temperature correction factor for the compressor speed and adjusted at the frequency.

[0010] Optionally, the pressure correction coefficient for the compressor speed includes a first pressure correction coefficient and a second pressure correction coefficient for the compressor speed; Based on the status parameter information of the target device, determine the pressure correction coefficient for the compressor speed and the calculation frequency of the pressure correction coefficient, including: Based on the compressor's operating parameter information, determine the first pressure correction coefficient, the second pressure correction coefficient, and the pressure correction coefficient calculation frequency for the compressor speed; The pressure correction factor for the compressor speed is adjusted based on the pressure correction factor for the compressor speed, including: The first pressure correction factor for adjusting the compressor speed is calculated based on the pressure correction factor for the compressor speed.

[0011] Optionally, the status parameter information of the target device includes: the heat load of each cooling circuit in the thermal management system and the temperature change rate of each cooling circuit; Based on the status parameter information of the target device, a first correction coefficient for the compressor speed is determined, including: The first correction factor for compressor speed is calculated based on the heat load of each cooling circuit and the temperature change rate of each cooling circuit in the thermal management system.

[0012] Optionally, after obtaining the target speed of the compressor, the control method further includes: The target speed of the compressor is limited according to the first speed threshold and the second speed threshold to obtain the first target speed of the compressor, wherein the second speed threshold is greater than the first speed threshold; The compressor is controlled to operate according to the first target speed.

[0013] Optionally, after obtaining the first target speed of the compressor, the vehicle compressor speed control method described in the first aspect further includes: Get the compressor speed from the previous compressor speed command; Based on the previous compressor speed and the compressor's first target speed, the compressor's first target speed is smoothed and filtered to obtain the compressor's second target speed; The compressor is controlled to operate according to the second target speed.

[0014] As a second aspect of this application, this application provides a vehicle compressor speed control device, comprising: The data acquisition module is used to acquire the status parameter information of the target device; The reference speed determination module is used to determine the reference speed of the compressor and the correction coefficient of the compressor speed based on the status parameter information of the target device. The correction module is used to correct the reference speed of the compressor based on the correction coefficient of the compressor speed to obtain the target speed of the compressor. The control module controls the compressor to operate according to the target speed.

[0015] As a third aspect of this application, this application provides a vehicle comprising: The vehicle compressor speed control device described in the second aspect above.

[0016] Based on the above, the vehicle compressor speed control method provided in this application acquires the status parameter information of the target device, monitors the compressor's operating status in real time, determines the compressor's reference speed based on the status parameter information of the target device, then corrects the compressor's reference speed based on the compressor's correction coefficient to obtain the compressor's target speed, and controls the compressor's operation according to the target speed. By dynamically correcting the compressor speed, the method can avoid compressor overheating while maintaining stable cooling performance, thereby improving the reliability and energy efficiency of the vehicle's thermal management system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The diagram shown is a flowchart illustrating a vehicle compressor speed control method provided in an embodiment of this application.

[0019] Figure 2 The diagram shown is a flowchart illustrating a method for determining the correction coefficient of compressor speed according to an embodiment of this application.

[0020] Figure 3 The diagram shown is a flowchart illustrating a method for determining the reference speed of a compressor according to an embodiment of this application.

[0021] Figure 4 The diagram shown is a flowchart of another vehicle compressor speed control method provided in an embodiment of this application.

[0022] Figure 5 The diagram shown is a flowchart of another vehicle compressor speed control method provided in an embodiment of this application.

[0023] Figure 6 The diagram shown is a structural block diagram of a vehicle compressor speed control device provided in an embodiment of this application.

[0024] Figure 7 The diagram shown is a structural block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0025] Unless otherwise defined, the technical or scientific terms used in the embodiments of this specification shall have the ordinary meaning understood by one of ordinary skill in the art to which this specification pertains. The terms "first," "second," and similar terms used in the embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to avoid confusion of constituent elements.

[0026] Unless the context otherwise requires, throughout this specification, "a plurality of" means "at least two," and "including" is interpreted as open-ended or encompassing, that is, "including, but not limited to." In the description of this specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this specification. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example.

[0027] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this specification.

[0028] Exemplary methods like Figure 1 As shown in the exemplary embodiment of this application, a vehicle compressor speed control method is provided, which may include the following steps: S10: Obtain the status parameter information of the target device.

[0029] The vehicle compressor speed control method in this application is applied to a vehicle thermal management cooling system. This system may include a battery cooling circuit, a motor cooling circuit, and other branches, specifically including cooling components such as a compressor, condenser, and cab air conditioning evaporator. To accurately obtain the cooling demand of each circuit and monitor the compressor's operating status, the vehicle thermal management cooling system is also equipped with various temperature and pressure sensors, such as a condenser temperature sensor, a compressor exhaust temperature sensor, an intake pressure sensor, an exhaust pressure sensor, and a cab temperature sensor. These temperature and pressure sensors can be connected to a vehicle controller, which acquires and processes the information from each sensor. Alternatively, they can be connected to a gateway, which acquires and processes the information. The vehicle controller is only responsible for controlling the compressor. Different controllers can be selected for acquiring and processing the information from the temperature and pressure sensors and for controlling the compressor; this application does not impose excessive limitations on this.

[0030] It is understandable that the target device can be related equipment that affects the compressor speed, such as the compressor itself, condenser, air conditioner evaporator, etc. The status parameter information of the target device can be related data that affects the compressor speed, such as information from various sensors connected to the controller.

[0031] S20: Based on the status parameter information of the target equipment, determine the reference speed of the compressor and the correction coefficient of the compressor speed.

[0032] Based on the target temperature in the cab and information from various sensors connected to the controller, the reference speed of the compressor can be determined. The reference speed of the compressor refers to a reference speed value of the compressor, and the compressor correction coefficient is used to correct the reference speed of the compressor.

[0033] S30: Correct the compressor's reference speed based on the compressor speed correction coefficient to obtain the compressor's target speed.

[0034] To balance the demands on the compressor from various aspects, the compressor's base speed is dynamically corrected based on the compressor speed correction coefficient to obtain the compressor's target speed.

[0035] S40: Controls the compressor operation according to the target speed.

[0036] The controller sends the target compressor speed to the compressor control unit in the form of a speed command, thereby enabling real-time dynamic adjustment of the compressor speed.

[0037] In some embodiments of this application, the operating status of the compressor is monitored in real time by acquiring the status parameter information of the target device. Based on the status parameter information of the target device, the reference speed of the compressor and the correction coefficient of the compressor speed are determined. Then, based on the correction coefficient of the compressor speed, the reference speed of the compressor is corrected to obtain the target speed of the compressor. The compressor is controlled to operate according to the target speed. By dynamically correcting the compressor speed, the high temperature of the compressor can be avoided while maintaining stable cooling performance, thereby improving the reliability and energy efficiency of the vehicle thermal management system.

[0038] In some embodiments of this application, such as Figure 2 As shown, in step S20, the correction coefficient for the compressor speed is determined based on the status parameter information of the target device. Specific steps may include: S21: Based on the status parameter information of the target equipment, determine the temperature correction coefficient and temperature correction coefficient calculation frequency of the compressor speed, the pressure correction coefficient and pressure correction frequency of the compressor speed, and the first correction coefficient.

[0039] In addition to considering the cooling demand of each cooling circuit in the vehicle's thermal management cooling system, the compressor's own operating status and the temperature change of the evaporator are also important factors affecting the compressor's speed. Based on these important factors affecting the compressor's speed, the temperature correction coefficient and the calculation frequency of the temperature correction coefficient, the pressure correction coefficient and the calculation frequency of the pressure correction coefficient, and the first correction coefficient of the compressor speed are determined.

[0040] S22: The temperature correction factor is used to calculate the compressor speed adjustment factor based on the temperature correction factor, and the pressure correction factor is used to calculate the compressor speed adjustment factor based on the pressure correction factor.

[0041] Based on the aforementioned key factors affecting compressor speed, the temperature correction coefficient and its calculation frequency, the pressure correction coefficient and its calculation frequency, and the first correction coefficient for compressor speed are determined. Then, the temperature correction coefficient for compressor speed is adjusted in real time using the temperature correction coefficient calculation frequency, and the pressure correction coefficient for compressor speed is adjusted in real time using the pressure correction coefficient calculation frequency. The reference speed of the compressor is dynamically corrected based on the temperature correction coefficient and its calculation frequency, the pressure correction coefficient and its calculation frequency, and the first correction coefficient.

[0042] In some embodiments of this application, the status parameter information of the target device may include: the target temperature and current temperature of the cab, the air conditioning fan speed setting, and the evaporator temperature information, such as... Figure 3 As shown, in step S20, the reference speed of the compressor is determined based on the status parameter information of the target device. Specific steps may include: S23: Calculate the first reference speed of the compressor based on the target temperature and the current temperature of the cab.

[0043] Specifically, the driver can click the temperature adjustment button or knob on the air conditioning panel to set the desired temperature. The air conditioning panel sends the temperature setting signal to the controller through the connected communication line (such as CAN bus, LIN bus or direct wire). The controller receives the temperature setting signal from the air conditioning panel, obtains the target temperature of the cab, obtains the current temperature of the cab according to the cab temperature sensor, and calculates the difference between the target temperature and the current temperature of the cab. Based on the difference between the target temperature and the current temperature, a first basic speed Nbase1 that meets the driver's comfort is generated.

[0044] In some implementations, when the current temperature of the cab is less than or equal to the target temperature of the cab, the cab does not need to be refrigerated, and the first reference speed of the compressor can be the reference speed (minimum holding speed) when there is no refrigeration or when the refrigeration demand is small.

[0045] S24: Determine the second reference speed of the compressor based on the air volume setting of the air conditioner.

[0046] This application also reflects the indirect demand for compressor speed through the user-selected fan speed setting. A preset relationship table LUT(W) between the air conditioner's fan speed setting and the compressor speed can be pre-set. This table is used to map the recommended speed corresponding to the air conditioner's fan speed setting. The fan speed setting refers to the fan speed level on the air conditioner panel, such as 0–5 or 0–3. When the driver selects the air conditioner's fan speed setting, the controller receives the fan speed setting signal from the air conditioner panel, obtains the air conditioner's fan speed setting, and then determines the compressor's second reference speed Nbase2 based on the preset relationship between the air conditioner's fan speed setting and the compressor speed.

[0047] S25: Calculate the third reference speed of the compressor based on the temperature information of the evaporator.

[0048] This application also uses the temperature information of the evaporator to constrain the compressor speed. Specifically, the compressor speed can be calculated as the third reference speed Nbase3 based on the surface temperature of the evaporator.

[0049] S26: Determine the reference speed of the compressor based on the first reference speed, the second reference speed, and the third reference speed of the compressor.

[0050] In some implementations, the minimum value among the first reference speed, the second reference speed, and the third reference speed of the compressor can be selected as the reference speed of the compressor. That is, the reference speed of the compressor Nbase = min(Nbase1, Nbase2, Nbase3).

[0051] This embodiment calculates the compressor speed in three different ways: a first reference speed corresponding to the cooling capacity of the cab to meet driver comfort, a second reference speed corresponding to the indirect demand of the air conditioner fan speed on the compressor speed based on the air conditioner fan speed setting, and a third reference speed corresponding to the compressor speed constrained by the evaporator surface temperature. The minimum value among the first, second, and third reference speeds of the compressor is selected as the reference speed of the compressor. This ensures that the reference speed of the compressor can respond to driver comfort, take into account the operational safety of the evaporator and compressor, and reduce energy consumption.

[0052] In some implementations, in step S25, the third reference speed of the compressor is calculated based on the temperature information of the evaporator. Specific steps may include: S251: When the surface temperature of the evaporator is less than or equal to the first preset temperature, the third reference speed of the compressor is determined to be the first speed threshold.

[0053] The evaporator temperature information can be the evaporator surface temperature. A first preset temperature, Teva_low, is set to prevent the evaporator from freezing. When the evaporator surface temperature, Teva_surf, is less than or equal to the first preset temperature, to prevent the evaporator from freezing, a third reference speed of the compressor is determined as the first speed threshold. The third reference speed, Nbase3, is equal to Nmin, and Teva_surf ≤ Teva_low. The first speed threshold, Nmin, is the compressor's preset minimum speed.

[0054] S252: When the surface temperature of the evaporator is less than the second preset temperature and greater than the first preset temperature, calculate the third reference speed of the compressor based on the first speed threshold, the evaporator surface temperature and the first preset temperature.

[0055] A second preset temperature, Teva_high, is set in advance to protect the evaporator from overheating. When the surface temperature of the evaporator is lower than the second preset temperature but higher than the first preset temperature, the third reference speed of the compressor is calculated based on the first speed threshold, the evaporator surface temperature, and the first preset temperature. At this time, the third reference speed of the compressor is between the first speed threshold and the second speed threshold.

[0056] S253: When the surface temperature of the evaporator is greater than or equal to the second preset temperature, the third reference speed of the compressor is determined to be the second speed threshold.

[0057] The second speed threshold Nmax is the preset maximum speed of the compressor. The second speed threshold Nmax is greater than the first speed threshold Nmin. For example, the second preset temperature can be set to +15℃ and the first preset temperature can be set to +2℃.

[0058] This embodiment protects the evaporator from freezing or overheating by setting a first preset temperature and a second preset temperature, and restricts the compressor speed when the evaporator surface temperature is too low or too high.

[0059] In some embodiments of this application, the state parameter information of the target device may further include: evaporator temperature information and compressor operating parameter information. The temperature correction coefficient for compressor speed includes a first temperature correction coefficient and a second temperature correction coefficient for compressor speed, and the calculation frequency of the temperature correction coefficient for compressor speed includes the calculation frequency of the first temperature correction coefficient and the calculation frequency of the second temperature correction coefficient for compressor speed. In step S21, the temperature correction coefficient for compressor speed and the temperature correction calculation frequency are determined based on the state parameter information of the target device. Specific steps may include: S211: Determine the first temperature correction coefficient for compressor speed based on the evaporator temperature information. First temperature correction coefficient calculation frequency.

[0060] In some implementations, the evaporator temperature information can be the change in the evaporator surface temperature and the temperature correction coefficient of the compressor speed. The reference speed of the compressor can be amplified or reduced based on the evaporator surface temperature to prevent the compressor from overheating or insufficient lubrication. The temperature correction coefficient of the compressor speed is generally taken in the range of [Kmin, Kmax]. Optionally, the minimum temperature correction coefficient Kmin can be set to 0.5 and the maximum temperature correction coefficient Kmax can be set to 1.2. By limiting the range of the temperature correction coefficient, the compressor can be prevented from over-excited.

[0061] The controller periodically acquires the surface temperature of the evaporator, thereby obtaining the change in the surface temperature of the evaporator. Based on the change in the surface temperature of the evaporator ΔTsh, the first temperature correction coefficient KT1 for the compressor speed is determined.

[0062] In some implementations, the temperature information of the evaporator may include the surface temperature of the evaporator and the rate of change of the surface temperature of the evaporator. The controller simultaneously acquires the surface temperature of the evaporator or the rate of change of the surface temperature dΔTsh / dt. When the rate of change of the surface temperature dΔTsh / dt is greater than the threshold of the rate of change of the surface temperature, the calculation frequency P1 of the first temperature correction coefficient is increased. Or when the surface temperature is close to the target surface temperature, the calculation frequency P1 of the first temperature correction coefficient is increased, so that the compressor increases the speed reduction force.

[0063] The first temperature correction coefficient mentioned above ensures that KT1 is small (deceleration) when the superheat is too small (close to freezing), and KT1≈1 when the superheat is normal.

[0064] S212: Determine the second temperature correction coefficient for compressor speed based on compressor operating parameter information. Calculation frequency of the second temperature correction coefficient.

[0065] In some implementations, the compressor's operating parameters may include the compressor's discharge temperature and discharge temperature change rate. Based on the compressor's discharge temperature, a second temperature correction coefficient KT2 is determined for the compressor speed. The compressor's base speed is then amplified or reduced based on the discharge temperature to prevent overheating or insufficient lubrication. Specifically, a compressor discharge temperature threshold can be set, and the second temperature correction coefficient for the compressor speed is determined based on the relationship between the compressor's discharge temperature and the discharge temperature threshold.

[0066] In some implementations, the controller simultaneously acquires the compressor's exhaust temperature or exhaust temperature change rate dTdis / dt. When the exhaust temperature change rate dTdis / dt is greater than the exhaust temperature change rate threshold, the calculation frequency P2 of the second temperature correction coefficient is increased. Alternatively, when the evaporator's surface temperature is close to the target surface temperature, the calculation frequency P2 of the second temperature correction coefficient is increased, causing the compressor to increase its speed reduction.

[0067] According to steps S211-S212, step S22 involves calculating the temperature correction factor for adjusting the compressor speed based on the frequency correction factor. Specific steps include: S221: The first temperature correction factor is used to calculate the compressor speed adjustment based on the first temperature correction factor.

[0068] After determining the calculation frequency of the first temperature correction coefficient based on the surface temperature or surface temperature change rate of the evaporator, the first temperature correction coefficient is used to adjust the compressor speed.

[0069] For example, if the compressor increases its speed reduction, the first temperature correction factor is determined to be P1. ’ P1 ’=P1⋅R, where R is the rate amplification factor, then the first temperature correction coefficient for the compressor speed is given by frequency P1. ’ Adjustments will be made.

[0070] S222: The second temperature correction factor is used to calculate the compressor speed adjustment based on the second temperature correction factor.

[0071] Based on the compressor's exhaust temperature or exhaust temperature change rate, the calculation frequency of the second temperature correction coefficient is determined, and then the second temperature correction coefficient is used to adjust the compressor speed.

[0072] In some embodiments of this application, the pressure correction coefficient for compressor speed includes a first pressure correction coefficient and a second pressure correction coefficient for compressor speed. In step S21, the pressure correction coefficient for compressor speed and the pressure correction coefficient calculation frequency are determined based on the state parameter information of the target device. Specific steps may include: S213: Based on the compressor's operating parameter information, determine the first pressure correction coefficient, the second pressure correction coefficient, and the pressure correction coefficient calculation frequency for the compressor speed.

[0073] In some implementations, the compressor's operating parameter information may include the compressor's discharge pressure, discharge pressure change rate, and suction pressure. The controller can obtain the compressor's discharge pressure Pout through the compressor's discharge pressure sensor and determine the first pressure correction coefficient KP1 for the compressor speed based on the compressor's discharge pressure.

[0074] In some implementations, the controller can obtain the compressor's discharge pressure and suction pressure through the compressor's discharge pressure sensor and suction pressure sensor, respectively, and calculate the difference ΔP between the suction pressure Pin and the discharge pressure Pout, where ΔP = Pout − Pin. Based on the difference between the compressor's discharge and suction pressures, a second pressure correction coefficient KP2 for the compressor speed is determined. Specifically, the value range of KP2 can be set to [0.5, 1.2]. When the difference ΔP between the suction pressure Pin and the discharge pressure Pout exceeds the set upper limit threshold, a strong speed limit is applied, resulting in KP2 reaching its minimum value.

[0075] In some implementations, a second pressure correction coefficient for the compressor speed can be determined based on the ratio of the compressor's discharge pressure to its intake pressure.

[0076] In some implementations, the controller simultaneously acquires the compressor's discharge pressure or discharge pressure change rate dPout / dt. When the discharge pressure change rate dPout / dt is greater than the discharge pressure change rate threshold, the pressure correction coefficient calculation frequency P3 is increased. Or, when the compressor's discharge pressure is close to the target discharge pressure, the pressure correction coefficient calculation frequency P3 is increased, causing the compressor to increase its deceleration force.

[0077] In some implementations, predictive algorithms based on thermodynamic simplified model predictive control (MPC) can also be used to optimize the future compressor speed trajectory by predicting short-term temperature rise, thereby limiting the compressor speed in advance.

[0078] According to step S213, the pressure correction factor for adjusting the compressor speed using the pressure correction factor in step S22 may include the following steps: S223: The first pressure correction factor for adjusting the compressor speed based on the pressure correction factor.

[0079] After determining the pressure correction coefficient calculation frequency P3 based on the compressor's discharge pressure or discharge pressure change rate, the first pressure correction coefficient KP1 is adjusted to the compressor speed using the pressure correction coefficient calculation frequency P3.

[0080] In some embodiments of this application, the state parameter information of the target device may further include: the heat load of each cooling circuit in the thermal management system and the temperature change rate of each cooling circuit. In step S21, the first correction coefficient for the compressor speed is determined based on the state parameter information of the target device. Specific steps may include: S214: The first correction factor for compressor speed is calculated based on the heat load of each cooling circuit in the thermal management system and the temperature change rate of each cooling circuit.

[0081] Specifically, the heat load of each cooling loop in the thermal management system is calculated separately. This can be done by measuring current, voltage, input power, and efficiency change rate. The temperature change rate of each cooling loop is related to the cooling medium and flow rate, heat source, and heat exchanger. Based on the heat load and temperature change rate of each cooling loop in the thermal management system, the first correction coefficient K3 is calculated.

[0082] Specifically, taking the cooling circuit, which includes both battery cooling circuit and motor cooling circuit, as an example, the formula for calculating the first correction factor K3 is as follows: Where Qbat is the current heat load of the battery cooling circuit, QDricab is the current heat load of the motor cooling circuit, and dt / dTcond is the temperature change rate of each cooling circuit.

[0083] In some implementations, after determining the first temperature correction coefficient KT1, the second temperature correction coefficient KT2, the first pressure correction coefficient KP1, the second pressure correction coefficient KP2, and the first correction coefficient K3 for the compressor speed, the reference speed of the compressor is corrected based on the temperature correction coefficient, the pressure correction coefficient, and the first correction coefficient. The formula for calculating the target speed Ntarget of the compressor is as follows: In some embodiments of this application, such as Figure 4 As shown, after obtaining the target speed of the compressor, the vehicle compressor speed control method described in the first aspect further includes the following steps: S50: Based on the first speed threshold and the second speed threshold, the target speed of the compressor is limited to obtain the first target speed of the compressor.

[0084] After the first speed threshold Nmin and the second speed threshold Nmax are preset, and the target speed Ntarget of the compressor is obtained according to the above steps S10-S30, in order to ensure the reliable operation of the compressor and the stability of the system, the target speed is limited by Ntarget according to the first speed threshold and the second speed threshold to obtain the first target speed of the compressor.

[0085] The formula for calculating the compressor's first target speed Nfinal is: Where Nmin is the compressor's minimum protection speed, used to ensure oil film lubrication and refrigerant flow; Nmax is the compressor's maximum safe speed, used to prevent overheating and mechanical overload; Clip() represents a limiting function, which takes the boundary value when the calculation result exceeds the range. That is, when the compressor's first target speed Ntarget is less than or equal to Nmin, Ntarget takes Nmin; when the compressor's first target speed Ntarget is greater than or equal to Nmax, Ntarget takes Nmax; when the compressor's first target speed Ntarget is less than Nmax but greater than Nmin, Ntarget remains unchanged.

[0086] S60: Control the compressor to run according to the first target speed.

[0087] In some embodiments of this application, such as Figure 5 As shown, after obtaining the first target speed of the compressor, the vehicle compressor speed control method described in the first aspect further includes the following steps: S70: Obtain the compressor speed from the previous compressor speed command.

[0088] The compressor speed command refers to the controller outputting the compressor speed as a compressor drive control signal to the compressor control unit, obtaining the compressor speed command from the last time the controller sent the compressor drive control signal, and obtaining the compressor speed from the last time.

[0089] S80: Based on the compressor speed in the previous test and the compressor's first target speed, the compressor's first target speed is smoothed and filtered to obtain the compressor's second target speed.

[0090] Specifically, the formula for calculating the second target speed of the compressor is as follows: Where Ncmd(t): the compressor target speed command at the current moment, t: speed adjustment response time constant, which is set according to the system inertia and is generally taken as 1~3s.

[0091] S90: Control the compressor operation according to the second target speed.

[0092] The controller sends the second target speed Ncmd(t) to the compressor control unit in the form of a speed command to achieve real-time dynamic adjustment.

[0093] In this embodiment, the vehicle system dynamically generates reasonable compressor speed commands under different cooling demands, environmental conditions, and thermal management branch operating conditions, thereby achieving a balance between cooling performance and compressor protection, avoiding high-temperature conditions, and improving system stability and energy efficiency.

[0094] In some implementations, while adjusting the compressor speed, the opening degree of the electronic expansion valve and the state of the shut-off valve are dynamically adjusted to achieve optimal matching between refrigerant flow and compressor load.

[0095] This application enables proactive prediction and adjustment of compressor operating status, allowing for early speed limiting under conditions of high superheat and high pressure differential, preventing high-temperature protection triggering, reducing compressor failure rate, and significantly improving system stability and cooling continuity. This application does not rely on internal IGBT protection triggering within the compressor; instead, it identifies "high-temperature trends" at the vehicle controller level. By calculating exhaust temperature and superheat in real time, when a rising high-temperature trend is detected, it can proactively adjust the compressor speed and electronic expansion valve opening, achieving system-level preventative control.

[0096] Exemplary device Below, as a second aspect of this application, this is as follows: Figure 6 As shown, the application also provides a vehicle compressor speed control device. It includes: a data acquisition module 601, a reference speed determination module 602, a correction module 603, and a control module 604, wherein... The data acquisition module 601 is used to acquire the status parameter information of the target device.

[0097] The reference speed determination module 602 is used to determine the reference speed of the compressor and the correction coefficient of the compressor speed based on the status parameter information of the target equipment.

[0098] The correction module 603 is used to correct the reference speed of the compressor based on the correction coefficient of the compressor speed to obtain the target speed of the compressor.

[0099] Control module 604 is used to control the compressor operation according to the target speed.

[0100] The vehicle compressor speed control device provided in this application acquires the status parameter information of the target device through a data acquisition module 601. Then, a reference speed determination module 602 determines the reference speed of the compressor and a correction coefficient based on the status parameter information of the target device acquired by the data acquisition module 601. Next, a correction module 603 corrects the reference speed of the compressor determined by the reference speed determination module 602 based on the correction coefficient, obtaining the target speed of the compressor. Finally, a control module 604 controls the compressor to operate according to the target speed determined by the correction module 603. This application, by monitoring the compressor's operating status in real time and dynamically correcting the compressor speed, can avoid high compressor temperatures while maintaining stable cooling performance, thus improving the reliability and energy efficiency of the vehicle's thermal management system.

[0101] The vehicle compressor speed control device provided in this embodiment belongs to the same application concept as the vehicle compressor speed control method provided in the above embodiments of this application. It can execute the vehicle compressor speed control method provided in any of the above embodiments of this application and has the corresponding functional units and beneficial effects of the vehicle compressor speed control method. Technical details not described in detail in this embodiment can be found in the specific processing content of the vehicle compressor speed control method provided in the above embodiments of this application, and will not be repeated here.

[0102] Exemplary vehicle As a third aspect of this application, this application provides a vehicle comprising: The vehicle compressor speed control device described in the second aspect.

[0103] The vehicle mentioned in this application may be an electric vehicle, a hydrogen fuel cell vehicle, or any other vehicle involving refrigerant multi-loop control.

[0104] Exemplary electronic devices As a fourth aspect of this application, this application also provides an electronic device. (Reference) Figure 7 This describes an electronic device according to embodiments of the present application.

[0105] Figure 7 The figure shows a structural block diagram of an electronic device according to an embodiment of the present application.

[0106] like Figure 7 As shown, the electronic device 70 includes one or more processors 701 and memory 702.

[0107] The processor 701 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 100 to perform desired functions.

[0108] The memory 702 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 701 may execute the program instructions to implement the vehicle compressor speed control methods of the various embodiments of this application described above, and / or other desired functions.

[0109] In one example, the electronic device 70 may also include an input device 703 and an output device 704, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).

[0110] When the electronic device is a standalone device, the input device 703 can be a communication network connector for receiving the collected input signals from the first device and the second device.

[0111] In addition, the input device 703 may also include, for example, a keyboard, a mouse, etc.

[0112] The output device 704 can output various information to the outside, including determined distance information, direction information, etc. The output device 704 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0113] Of course, for the sake of simplicity, Figure 7 Only some of the components of the electronic device 70 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the electronic device 70 may include any other suitable components depending on the specific application.

[0114] Exemplary computer-readable storage media As a fifth aspect of this application, this application provides a computer-readable storage medium storing a computer program for performing the steps in the vehicle compressor speed control method of the various embodiments described above.

[0115] Computer-readable storage media may take the form of any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0116] In addition to the methods and devices described above, embodiments of this application may also be computer program products, which include computer program information. When the computer program information is run by a processor, it causes the processor to execute the steps in the vehicle compressor speed control methods of various embodiments of this application.

[0117] Computer program products can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0118] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0119] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0120] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

Claims

1. A method for controlling the speed of a vehicle compressor, characterized in that, include: Obtain the status parameter information of the target device; Based on the status parameter information of the target device, determine the reference speed of the compressor and the correction coefficient of the compressor speed; The compressor's reference speed is corrected based on the compressor speed correction coefficient to obtain the compressor's target speed; The compressor is controlled to operate according to the target speed. Based on the status parameter information of the target device, determine the correction coefficient for the compressor speed, including: Based on the status parameter information of the target device, determine the temperature correction coefficient and temperature correction coefficient calculation frequency of the compressor speed, the pressure correction coefficient and pressure correction frequency of the compressor speed, and the first correction coefficient; The temperature correction factor is used to calculate the frequency of the temperature correction factor to adjust the compressor speed, and the pressure correction factor is used to calculate the frequency of the pressure correction factor to adjust the compressor speed. The status parameter information of the target equipment includes: the target temperature and current temperature of the cab, the air conditioning fan speed setting, and the evaporator temperature information; Based on the status parameter information of the target device, the reference speed of the compressor is determined, including: Calculate the first reference speed of the compressor based on the target temperature and the current temperature of the cab; The second reference speed of the compressor is determined based on the air volume setting of the air conditioner; Based on the temperature information of the evaporator, calculate the third reference speed of the compressor; The reference speed of the compressor is determined based on the first reference speed, the second reference speed, and the third reference speed of the compressor.

2. The vehicle compressor speed control method according to claim 1, characterized in that, The status parameter information of the target device includes: compressor operating parameter information; The temperature correction factor for the compressor speed includes a first temperature correction factor and a second temperature correction factor for the compressor speed. The calculation frequency of the temperature correction coefficient for the compressor speed includes the calculation frequency of the first temperature correction coefficient and the calculation frequency of the second temperature correction coefficient for the compressor speed. Based on the status parameter information of the target device, determine the temperature correction coefficient for the compressor speed and the calculation frequency of the temperature correction coefficient, including: Based on the temperature information of the evaporator, determine the first temperature correction coefficient for the compressor speed and the calculation frequency of the first temperature correction coefficient; Based on the compressor's operating parameter information, determine the second temperature correction coefficient for the compressor speed and the second temperature correction coefficient calculation frequency; The temperature correction factor for the compressor speed is adjusted based on the calculated frequency of the temperature correction factor for the compressor speed, including: The first temperature correction factor for the compressor speed is adjusted based on the first temperature correction factor for the compressor speed. The second temperature correction factor for the compressor speed is calculated based on the second temperature correction factor for the compressor speed and adjusted at the frequency.

3. The vehicle compressor speed control method according to claim 2, characterized in that, The pressure correction factor for compressor speed includes a first pressure correction factor and a second pressure correction factor for compressor speed. Based on the status parameter information of the target device, determine the pressure correction coefficient for the compressor speed and the calculation frequency of the pressure correction coefficient, including: Based on the compressor's operating parameter information, determine the first pressure correction coefficient, the second pressure correction coefficient, and the pressure correction coefficient calculation frequency for the compressor speed; The pressure correction factor for the compressor speed is adjusted based on the pressure correction factor for the compressor speed, including: The first pressure correction factor for adjusting the compressor speed is calculated based on the pressure correction factor for the compressor speed.

4. The vehicle compressor speed control method according to claim 1, characterized in that, The status parameter information of the target device includes: the heat load of each cooling circuit in the thermal management system and the temperature change rate of each cooling circuit; Based on the status parameter information of the target device, a first correction coefficient for the compressor speed is determined, including: The first correction factor for compressor speed is calculated based on the heat load of each cooling circuit and the temperature change rate of each cooling circuit in the thermal management system.

5. The vehicle compressor speed control method according to claim 1, characterized in that, After obtaining the target speed of the compressor, the control method further includes: The target speed of the compressor is limited according to the first speed threshold and the second speed threshold to obtain the first target speed of the compressor, wherein the second speed threshold is greater than the first speed threshold. The compressor is controlled to operate according to the first target speed.

6. The vehicle compressor speed control method according to claim 5, characterized in that, After obtaining the first target speed of the compressor, the control method further includes: Get the compressor speed from the previous compressor speed command; Based on the previous compressor speed and the compressor's first target speed, the compressor's first target speed is smoothed and filtered to obtain the compressor's second target speed; The compressor is controlled to operate according to the second target speed.

7. A vehicle compressor speed control device, characterized in that, include: The data acquisition module is used to acquire the status parameter information of the target device; The reference speed determination module is used to determine the reference speed of the compressor and the correction coefficient of the compressor speed based on the status parameter information of the target device. Based on the status parameter information of the target equipment, the compressor speed correction coefficient is determined, including: determining the compressor speed temperature correction coefficient and temperature correction coefficient calculation frequency, the compressor speed pressure correction coefficient and pressure correction coefficient calculation frequency, and a first correction coefficient based on the status parameter information of the target equipment; adjusting the compressor speed temperature correction coefficient according to the temperature correction coefficient calculation frequency, and adjusting the compressor speed pressure correction coefficient according to the pressure correction coefficient calculation frequency; the target equipment status parameter information includes: the target temperature and current temperature of the cab, the air conditioning fan speed setting, and the evaporator temperature information; based on the target equipment status parameter information, the compressor reference speed is determined, including: calculating the compressor first reference speed based on the target temperature and current temperature of the cab; determining the compressor second reference speed based on the air conditioning fan speed setting; calculating the compressor third reference speed based on the evaporator temperature information; and determining the compressor reference speed based on the compressor first reference speed, the compressor second reference speed, and the compressor third reference speed. The correction module is used to correct the reference speed of the compressor based on the correction coefficient of the compressor speed to obtain the target speed of the compressor. The control module controls the compressor to operate according to the target speed.

8. A vehicle, characterized in that, include: The vehicle compressor speed control device according to claim 7.

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