Commercial vehicle dual-mode air conditioner control and protection method and system with multiple temperature sensors

Abstract

The invention provides a commercial vehicle dual-mode air conditioner control and protection method and system with multiple temperature sensors, and belongs to the technical field of vehicle air conditioner control. The operation parameters comprise an engine rotating speed signal, an air conditioner refrigeration request signal, an environment temperature, an evaporator temperature, an in-vehicle temperature and a panel set temperature; the current operation state of the dual-mode air conditioner is judged based on the operation parameters; when the running state is a running refrigeration state, parameters of low-temperature protection logic are selected according to the environment temperature, the evaporator temperature, the in-vehicle temperature and the panel set temperature; and on the basis of the selected parameters of the low-temperature protection logic, starting and stopping of the mechanical compressor and the electric compressor are controlled, and the low-temperature protection logic is executed to control entering and exiting of a low-temperature protection state and an icing protection state. The refrigeration mode is dynamically adjusted through monitoring of the multiple temperature sensors, compressor abrasion is reduced, energy consumption is reduced, and the stability and comfort of an air conditioning system are improved.

Description

Technical Field

[0001] This application belongs to the field of vehicle air conditioning control technology, specifically relating to a dual-mode air conditioning control and protection method and system for commercial vehicles with multiple temperature sensors. Background Technology

[0002] Currently, with increasing user demands for driving comfort in commercial vehicles, dual-mode air conditioning systems are widely adopted. This involves adding an electric compressor to the traditional mechanical compressor to support both driving and parking cooling. In conditions such as spring and autumn, and at night when ambient temperatures are low and heat loads are low, the mechanical compressor's cooling output is often excessive, easily leading to excessively low evaporator temperatures, triggering icing protection, and causing frequent compressor start-stop cycles. This not only affects the stability of the outlet air temperature and reduces passenger comfort but also increases compressor wear and system energy consumption.

[0003] Under low heat load conditions, existing dual-mode air conditioning systems typically still rely on mechanical compressors as the primary cooling source, with electric compressors only used for parking cooling when the engine is off. This fails to flexibly switch between systems based on actual cooling needs during driving. Furthermore, traditional icing protection logic is largely based on fixed temperature thresholds, lacking a comprehensive assessment of factors such as ambient temperature, in-vehicle temperature, and set temperature. This results in insufficiently intelligent protection triggering and recovery, failing to balance comfort, energy efficiency, and system reliability.

[0004] Therefore, there is an urgent need for an intelligent control method that can dynamically adjust the compressor's cooling mode and protection parameters based on signals from multiple temperature sensors, in order to reduce frequent compressor starts and stops while avoiding evaporator icing, thereby improving system efficiency and comfort. Summary of the Invention

[0005] In a first aspect, embodiments of this application provide a method for controlling and protecting a dual-mode air conditioning system for commercial vehicles using multiple temperature sensors, comprising the following steps: S1. Obtain the operating parameters of the commercial vehicle's dual-mode air conditioning; the operating parameters include engine speed signal, air conditioning cooling request signal, and ambient temperature. Evaporator temperature Car interior temperature and panel set temperature ; S2. Determine the current operating status of the dual-mode air conditioner based on the operating parameters; the current operating status includes driving cooling status, parking cooling status, or compressor disabled status; S3. When the operating status is vehicle cooling mode, then based on the ambient temperature... Evaporator temperature Car interior temperature and panel set temperature Select the parameters for the low-temperature protection logic; S4. Based on the parameters of the selected low-temperature protection logic, control the start and stop of the mechanical compressor and the electric compressor, execute the low-temperature protection logic, and control the entry and exit of the low-temperature protection state and the icing protection state.

[0006] Furthermore, the specific steps of step S2 are as follows: S21. A speed threshold for the engine is preset based on the engine idle speed, and the speed threshold can ensure that the mechanical compressor can be driven normally; S22. Determine the status of the air conditioning cooling request signal and the engine speed signal; If the air conditioning cooling request is valid and the engine speed is greater than or equal to the speed threshold, it is determined to be in driving cooling state, and proceed to step S3; If the air conditioning cooling request is valid and the engine speed is zero, it is determined to be in parking cooling mode, and the electric compressor is started to cool. If the air conditioning cooling request is valid, but the engine speed is not zero and is below the speed threshold, then starting the mechanical compressor and electric compressor is prohibited.

[0007] Furthermore, the parameters selected for the low-temperature protection logic in step S3 include the low-temperature protection trigger temperature. Ice-freezing protection trigger temperature Ice protection deactivation temperature Basic judgment waiting time t and basic low-speed protection end temperature .

[0008] Furthermore, the specific steps of step S4 are as follows: S41. Based on evaporator temperature Low temperature protection trigger temperature Ice-freezing protection trigger temperature The relationship between the air conditioning system and the vehicle's cooling system is used to gradually transition the air conditioning system from the vehicle's cooling state to the low-temperature protection state or the icing protection state. S42. Based on evaporator temperature And combined with the temperature inside the vehicle Temperature set on the panel Dynamically calculated dynamic exit temperature threshold, and / or based on ambient temperature. The dynamically calculated waiting time controls the air conditioning system to exit either the icing protection state or the low temperature protection state.

[0009] Furthermore, the specific steps of step S41 are as follows: S411. When the vehicle is in cooling mode and the mechanical compressor is running, if the evaporator temperature is detected... Continuously below the low temperature protection trigger temperature Once the first preset time period is reached, the mechanical compressor is shut down, and the electric compressor is started after the second preset time period, so that the air conditioning system enters the low temperature protection state. S412. When the air conditioning system is in low-temperature protection mode, if the evaporator temperature is monitored... Continuously below the freezing protection trigger temperature Once the third preset time period is reached, the electric compressor is shut down, putting the system into an icing protection state.

[0010] Furthermore, dynamically exit the temperature threshold. Determined in the following ways: Calculate the temperature difference inside the car : ; Temperature difference inside the car It is compared with several consecutive preset temperature difference intervals, each temperature difference interval corresponding to a preset exit temperature adjustment value; Based on the temperature difference inside the car The temperature range in which it is located will determine the end temperature of the basic low-speed protection. Adding the corresponding exit temperature adjustment value yields the dynamic exit temperature threshold. .

[0011] Furthermore, the specific steps of step S42 are as follows: S421. When the air conditioning system is in icing protection mode, start the timer and adjust the timer according to the ambient temperature. Dynamically determine the target waiting time required to exit protection. ; When the accumulated time reaches the target waiting time And the current evaporator temperature Higher than the freezing protection deactivation temperature When this happens, restart the electric compressor to allow the air conditioning system to exit the icing protection state and return to the low temperature protection state; S422. When the air conditioning system is in low-temperature protection mode, it adjusts according to the interior temperature. The difference between the temperature and the set temperature Td on the panel Dynamically calculate the dynamic exit temperature threshold ; If the evaporator temperature is monitored Above the dynamic exit temperature threshold If the system shuts down the electric compressor, it will start the mechanical compressor after the fourth preset time, causing the air conditioning system to exit the low-temperature protection state and return to the driving cooling state.

[0012] Furthermore, target waiting time Determined in the following ways: Calculate ambient temperature difference : ,in, The preset required cooling reference temperature; Determine the ambient temperature difference Is it below the preset temperature difference threshold? If so, the timer will be stopped and reset, and the air conditioning system will remain in icing protection mode. Otherwise, the ambient temperature difference It is compared with several consecutive preset temperature difference intervals, each temperature difference interval corresponding to a preset waiting time coefficient; According to the ambient temperature difference The target waiting time is obtained by multiplying the basic judgment waiting time t by the corresponding waiting time coefficient within the temperature difference range. .

[0013] Furthermore, step S4 also includes optimizing the operation control steps: S43. When the air conditioning system is in low-temperature protection mode, and the evaporator temperature... The electric compressor will continue to run while the mechanical compressor remains off, provided the following conditions are met: Evaporator temperature >Ice protection trigger temperature And evaporator temperature Dynamically exit temperature threshold .

[0014] Secondly, embodiments of this application also provide a dual-mode air conditioning control and protection method system for commercial vehicles with multiple temperature sensors, including: The operating parameter acquisition module is used to acquire the operating parameters of the dual-mode air conditioning system in commercial vehicles; the operating parameters include engine speed signal, air conditioning cooling request signal, and ambient temperature. Evaporator temperature Car interior temperature and panel set temperature ; The operating status determination module is used to determine the current operating status of the dual-mode air conditioner based on the operating parameters; the current operating status includes driving cooling status, parking cooling status, or compressor inactive status; The protection parameter selection module is used to select parameters based on the ambient temperature when the vehicle is in driving cooling mode. Evaporator temperature Car interior temperature and panel set temperature Select the parameters for the low-temperature protection logic; The compressor control and protection execution module is used to control the start and stop of the mechanical compressor and the electric compressor based on the parameters of the selected low temperature protection logic, and to execute the low temperature protection logic to control the entry and exit of the low temperature protection state and the icing protection state.

[0015] As can be seen from the above technical solutions, this application has the following advantages: The dual-mode air conditioning control and protection method and system for commercial vehicles provided in this application, through comprehensive monitoring and dynamic adjustment of multiple temperature sensors, can flexibly switch the working modes of the mechanical compressor and the electric compressor according to actual operating conditions. This avoids frequent start-stop and temperature fluctuations caused by excessive or insufficient cooling capacity in traditional air conditioning systems, improving the stability of the vehicle interior temperature and the comfort of passengers. It reduces the number of frequent compressor start-stops, reduces mechanical wear, extends the service life of both mechanical and electric compressors, and reduces the failure rate of the air conditioning system, improving its reliability and economy. It intelligently selects the appropriate cooling mode under different operating conditions, avoiding unnecessary energy waste. Especially under low heat load conditions, by optimizing the use of the electric compressor, it reduces the energy consumption of the air conditioning system, which is in line with the energy-saving trend. It can adapt to various complex operating conditions, such as driving cooling and parking cooling, and flexibly adjusts the protection logic and control strategy according to different operating conditions, making it suitable for various commercial vehicle models and usage scenarios. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall process of the dual-mode air conditioning control and protection method for commercial vehicles with multiple temperature sensors according to the present invention.

[0018] Figure 2 This is a schematic diagram illustrating the specific process of the multi-temperature sensor dual-mode air conditioning control and protection method for commercial vehicles according to the present invention. Figure 3 This is a schematic diagram of the dual-mode air conditioning control and protection system for commercial vehicles with multiple temperature sensors according to the present invention. Detailed Implementation

[0019] The various embodiments of this disclosure will be described more fully in the following detailed steps of the dual-mode air conditioning control and protection method for commercial vehicles with multiple temperature sensors. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0020] For example, with the increasing demand for improved driving comfort in commercial vehicles, dual-mode air conditioning systems (mechanical compressor + electric compressor) have become a common configuration for vehicle air conditioning to meet both driving and parking cooling conditions. However, under low heat load conditions such as spring and autumn, and at night, the mechanical compressor's cooling capacity is excessive, which can easily cause the evaporator temperature to drop too low, triggering icing protection and leading to frequent compressor start-stop cycles. This not only disrupts the stability of the outlet air temperature and reduces driving comfort, but also exacerbates compressor wear and system energy consumption.

[0021] Currently, dual-mode air conditioning systems rely primarily on mechanical compressors under low heat load conditions, with the electric compressor only activated when the vehicle is parked, making it impossible to switch flexibly according to actual needs. Furthermore, traditional icing protection logic is based on fixed temperature thresholds and does not comprehensively consider factors such as ambient temperature, vehicle interior temperature, and set temperature, resulting in an insufficiently intelligent protection mechanism that struggles to balance comfort, energy efficiency, and system reliability.

[0022] Therefore, there is an urgent need for an intelligent control method based on multi-temperature sensor signals to dynamically adjust the compressor's cooling mode and protection parameters, prevent evaporator icing, reduce the number of compressor start-stop cycles, and comprehensively improve system efficiency and comfort.

[0023] To address the aforementioned issues, this embodiment provides a dual-mode air conditioning control and protection method for commercial vehicles using multiple temperature sensors. By monitoring multiple temperature sensors, the cooling mode is dynamically adjusted, reducing compressor wear, lowering energy consumption, and significantly improving system stability and comfort.

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1 The diagram shows a flowchart of a dual-mode air conditioning control and protection method for commercial vehicles with multiple temperature sensors, according to a specific embodiment. The method includes the following steps: S1. Obtain the operating parameters of the commercial vehicle's dual-mode air conditioning; the operating parameters include engine speed signal, air conditioning cooling request signal, and ambient temperature. Evaporator temperature Car interior temperature and panel set temperature ; It should be noted that obtaining comprehensive operating parameters provides accurate and real-time data support for judging the operating status and controlling the protection logic, ensuring the reliability and effectiveness of the entire control. S2. Determine the current operating status of the dual-mode air conditioner based on the operating parameters; the current operating status includes driving cooling status, parking cooling status, or compressor disabled status; It should be noted that judging the current operating status of the dual-mode air conditioner based on operating parameters can quickly and accurately identify the operating condition of the air conditioning system (driving cooling, parking cooling, or compressor inactive), thus providing a basis for the selection of control strategies and avoiding blind control. S3. When the operating status is vehicle cooling mode, then based on the ambient temperature... Evaporator temperature Car interior temperature and panel set temperature Select the parameters for the low-temperature protection logic; It should be noted that when the operating state is the vehicle cooling state, the parameters of the low temperature protection logic are selected based on multiple temperature parameters, so that the protection logic can fully consider the temperature changes under actual operating conditions, enhance the adaptability and accuracy of the protection logic, provide a reasonable parameter basis for compressor start-stop control, and prevent the evaporator icing problem. S4. Based on the parameters of the selected low-temperature protection logic, control the start and stop of the mechanical compressor and the electric compressor, execute the low-temperature protection logic, and control the entry and exit of the low-temperature protection state and the icing protection state. It should be noted that this step achieves precise control over the low-temperature protection state and the icing protection state, ensuring the stable operation of the air conditioning system under different temperature conditions. At the same time, it reduces the frequent start-stop of the compressor, reduces energy consumption and equipment wear, and improves the overall efficiency and service life of the air conditioning system.

[0026] This embodiment uses multiple temperature sensors to monitor parameters such as ambient temperature, evaporator temperature, and vehicle interior temperature in real time, dynamically adjusts the operating modes of the mechanical and electric compressors, optimizes low-temperature protection and icing protection logic, effectively reduces frequent compressor start-stop, lowers energy consumption, extends equipment life, and improves the stability of vehicle interior temperature and passenger comfort, demonstrating good economic efficiency and practicality.

[0027] Furthermore, as a refinement and extension of the specific implementation methods of the above embodiments, in order to fully illustrate the specific implementation process in this embodiment, as follows: Figure 2 As shown, another method for controlling and protecting the dual-mode air conditioning system of commercial vehicles using multiple temperature sensors is provided, with the following basic parameters preset: Engine speed threshold: Based on the engine idle speed, set to 800 r / min (to ensure normal operation of the mechanical compressor). Core parameter of low temperature protection logic: Low temperature protection trigger temperature =3℃; Icy protection trigger temperature =-1℃; Ice protection deactivation temperature =5℃; Basic judgment waiting time t=30s; Basic low-speed protection end temperature =6℃; Preset duration parameter: First preset duration (evaporator temperature is below) The first preset time (duration of the mechanical compressor shutting down and the electric compressor starting) = 10s; the second preset time (interval between the mechanical compressor shutting down and the electric compressor starting) = 10s; the third preset time (interval between the evaporator temperature and the time between the mechanical compressor shutting down and the electric compressor starting) = 10s; The duration of the first preset time (the interval between the electric compressor turning off and the mechanical compressor starting) is 10 seconds; the fourth preset time (the interval between the electric compressor turning off and the mechanical compressor starting) is 10 seconds. Other reference parameters: Preset required cooling reference temperature =25℃; Preset temperature difference threshold (ambient temperature difference judgment threshold) = -2℃; In-vehicle temperature difference range and corresponding exit temperature adjustment value: Temperature difference > 5℃: Adjustment value = 0℃; 0℃ < Temperature difference ≤ 5℃: ​​Adjustment value = 2℃; -5℃ < Temperature difference ≤ 0℃: Adjustment value = 4℃; Temperature difference ≤ -5℃: Adjustment value = 6℃; Ambient temperature difference range and corresponding waiting time coefficient: Temperature difference > 5℃: coefficient = 1.0; 0℃ < temperature difference ≤ 5℃: ​​coefficient = 1.5; -2℃ < temperature difference ≤ 0℃: coefficient = 2.0; Temperature difference ≤ -2℃: coefficient = 0 (stop timing); The sensor data was collected as follows: Each temperature sensor samples at a frequency of 1Hz with a data accuracy of ±0.5℃, ensuring real-time performance and accuracy: ambient temperature. : Collected by the vehicle's external ambient temperature sensor; evaporator temperature Temperature inside the vehicle is collected by a temperature sensor at the evaporator coil. Temperature data is collected by a temperature sensor in the vehicle's central control area; the temperature is set on the control panel. : Set by the driver via the air conditioning control panel (range 16℃-30℃). The method includes the following steps: S1. Obtain the operating parameters of the commercial vehicle's dual-mode air conditioning; the operating parameters include engine speed signal, air conditioning cooling request signal, and ambient temperature. Evaporator temperature Car interior temperature and panel set temperature ; For example, after the air conditioning system is started, the operating parameter acquisition module collects the following data in real time: engine speed signal: acquired through the engine ECU, real-time value is 950 r / min; air conditioning cooling request signal: the signal is valid when the driver presses the air conditioning cooling button; ambient temperature. =18℃; Evaporator temperature =7℃; Interior temperature =26℃; Panel set temperature =22℃; S2. Determine the current operating status of the dual-mode air conditioner based on the operating parameters; the current operating status includes driving cooling status, parking cooling status, or compressor disabled status; The specific steps of step S2 are as follows: S21. A speed threshold for the engine is preset based on the engine idle speed, and the speed threshold can ensure that the mechanical compressor can be driven normally; S22. Determine the status of the air conditioning cooling request signal and the engine speed signal; If the air conditioning cooling request is valid and the engine speed is greater than or equal to the speed threshold, it is determined to be in driving cooling state, and proceed to step S3; If the air conditioning cooling request is valid and the engine speed is zero, it is determined to be in parking cooling mode, and the electric compressor is started to cool. If the air conditioning cooling request is valid, but the engine speed is not zero and is below the speed threshold, then starting the mechanical compressor and electric compressor is prohibited. For example, the engine speed threshold has been preset to 800 r / min; determine the current signal status: The air conditioning cooling request is valid, and the engine speed is 950 r / min ≥ speed threshold 800 r / min. Therefore, it is determined to be in driving cooling state, and proceed to step S3. It should be noted that, based on engine speed and air conditioning cooling request signals, the system accurately distinguishes between driving cooling, parking cooling, and compressor inactive states, ensuring the correct operation of the system under different operating conditions and avoiding control errors caused by misjudgment of the state. S3. When the operating status is vehicle cooling mode, then based on the ambient temperature... Evaporator temperature Car interior temperature and panel set temperature Select the parameters for the low-temperature protection logic; The parameters selected for the low-temperature protection logic in step S3 include the low-temperature protection trigger temperature. Ice-freezing protection trigger temperature Ice protection deactivation temperature Basic judgment waiting time t and basic low-speed protection end temperature ; For example, based on the currently collected temperature parameters ( =18℃ =7℃ =26℃ =22℃), the selected low-temperature protection logic parameters are as follows: Low-temperature protection trigger temperature =3℃; Icy protection trigger temperature =-1℃; Ice protection deactivation temperature =5℃; Basic judgment waiting time t=30s; Basic low-speed protection end temperature =6℃; It should be noted that the introduction of parameters selected for the low-temperature protection logic enables the system to flexibly adjust the protection strategy according to different temperature conditions, enhancing the pertinence of the protection logic and providing a basis for protection control. S4. Based on the parameters of the selected low-temperature protection logic, control the start and stop of the mechanical compressor and the electric compressor, execute the low-temperature protection logic, and control the entry and exit of the low-temperature protection state and the icing protection state. The specific steps of step S4 are as follows: S41. Based on evaporator temperature Low temperature protection trigger temperature Ice-freezing protection trigger temperature The relationship between the air conditioning system and the vehicle's cooling system is used to gradually transition the air conditioning system from the vehicle's cooling state to the low-temperature protection state or the icing protection state. The specific steps of step S41 are as follows: S411. When the vehicle is in cooling mode and the mechanical compressor is running, if the evaporator temperature is detected... Continuously below the low temperature protection trigger temperature Once the first preset time period is reached, the mechanical compressor is shut down, and the electric compressor is started after the second preset time period, so that the air conditioning system enters the low temperature protection state. S412. When the air conditioning system is in low-temperature protection mode, if the evaporator temperature is monitored... Continuously below the freezing protection trigger temperature Once the third preset time period is reached, the electric compressor will be shut down, putting the system into icing protection mode. It should be noted that the triggering conditions and control sequence for the air conditioning system to enter the low temperature protection state and the icing protection state have determined the compressor operation under different protection states, ensuring that the system can take timely and accurate protective measures when approaching the risk of icing, thus avoiding the problem of evaporator icing. S42. Based on evaporator temperature And combined with the temperature inside the vehicle Temperature set on the panel Dynamically calculated dynamic exit temperature threshold, and / or based on ambient temperature. The dynamically calculated waiting time controls the air conditioning system to exit either the icing protection state or the low temperature protection state. Dynamic exit temperature threshold Determined in the following ways: Calculate the temperature difference inside the car : ; Temperature difference inside the car It is compared with several consecutive preset temperature difference intervals, each temperature difference interval corresponding to a preset exit temperature adjustment value; Based on the temperature difference inside the car The temperature range in which it is located will determine the end temperature of the basic low-speed protection. Adding the corresponding exit temperature adjustment value yields the dynamic exit temperature threshold. ; For example, in the initial state: when the vehicle is in cooling mode, the mechanical compressor is running normally and continuously providing cooling; Low temperature protection mode activated: After running for 15 minutes, due to the decrease in ambient temperature and the cumulative cooling effect, the evaporator temperature... Continuing to decline; when monitored =2℃ (lower than) If the temperature reaches 3℃ and this state lasts for 10 seconds (first preset duration), the system will immediately shut down the mechanical compressor; after an interval of 10 seconds (second preset duration), the electric compressor will start (running at the lowest speed), and the air conditioning system will officially enter the low temperature protection state. Entering icing protection mode: After running in low-temperature protection mode for 8 minutes, the ambient temperature further decreased to 12℃, and the evaporator temperature... Continue to drop to -2℃ (below) If the temperature reaches -1℃ and this state lasts for 10 seconds (the third preset duration), the system will control the electric compressor to shut down and enter the icing protection state. It should be noted that by comparing the temperature difference inside the vehicle with the preset temperature difference range, the adaptive adjustment of the exit temperature threshold is achieved, enabling the system to flexibly adjust the protection exit conditions according to the actual temperature requirements inside the vehicle, thereby improving the system's comfort and energy-saving effect. The specific steps of step S42 are as follows: S421. When the air conditioning system is in icing protection mode, start the timer and adjust the timer according to the ambient temperature. Dynamically determine the target waiting time required to exit protection. ; Target waiting time Determined in the following ways: Calculate ambient temperature difference : ,in, The preset required cooling reference temperature; Determine the ambient temperature difference Is it below the preset temperature difference threshold? If so, the timer will be stopped and reset, and the air conditioning system will remain in icing protection mode. Otherwise, the ambient temperature difference It is compared with several consecutive preset temperature difference intervals, each temperature difference interval corresponding to a preset waiting time coefficient; According to the ambient temperature difference The target waiting time is obtained by multiplying the basic judgment waiting time t by the corresponding waiting time coefficient within the temperature difference range. ; When the accumulated time reaches the target waiting time And the current evaporator temperature Higher than the freezing protection deactivation temperature When this happens, restart the electric compressor to allow the air conditioning system to exit the icing protection state and return to the low temperature protection state; S422. When the air conditioning system is in low-temperature protection mode, it adjusts according to the interior temperature. The difference between the temperature and the set temperature Td on the panel Dynamically calculate the dynamic exit temperature threshold ; If the evaporator temperature is monitored Above the dynamic exit temperature threshold If the electric compressor is turned off, the mechanical compressor will be started after the fourth preset time, so that the air conditioning system exits the low temperature protection state and returns to the driving cooling state. It should be noted that by determining the calculation method of the target waiting time, and by comparing the ambient temperature difference with the preset temperature difference range, a waiting time coefficient is introduced to adjust the basic judgment waiting time, which further optimizes the exit timing of the icing protection state, enhances the adaptability to changes in ambient temperature, and ensures the stable operation of the air conditioning system under different environmental conditions. For example, the icing protection state is exited: After entering the icing protection state, the system starts timing; first, it calculates the ambient temperature difference. =12℃-25℃=-13℃, which is lower than the preset temperature difference threshold of -2℃. Therefore, the system stops and resets the timer to maintain the icing protection state. After 30 minutes, the ambient temperature rose back to 16℃. =16℃, =16-25=-9℃, still below -2℃, continue to maintain the icing protection state; Twenty minutes later, the ambient temperature rose back to 20°C. =20℃, =20-25=-5℃, still below -2℃, maintaining icing protection; When the ambient temperature rises to 26℃, Ta = 26℃. =26-25=1℃ (0℃ < ≤5℃), corresponding waiting time coefficient = 1.5, target waiting time =t×1.5=30×1.5=45s; The system started timing, and after accumulating 45 seconds, the evaporator temperature was monitored. =6℃ (higher than the temperature at which freezing protection is deactivated) If the temperature reaches 5℃, immediately restart the electric compressor. The air conditioning system will exit the icing protection state and return to the low temperature protection state. Low temperature protection mode exited: Under low temperature protection mode, first calculate the temperature difference inside the vehicle. =24℃-22℃=2℃ (0℃<ΔTc≤5℃), corresponding exit temperature adjustment value=2℃; Dynamic exit temperature threshold = +Adjustment value = 6℃ + 2℃ = 8℃; Continuous monitoring of evaporator temperature ,when Rise to 9℃ (higher than) When the temperature reaches 8℃, the system controls the electric compressor to shut down; after an interval of 10 seconds (the fourth preset time), the mechanical compressor is started, the air conditioning system exits the low temperature protection state, and returns to the driving cooling state; It should be noted that by clarifying the specific steps and conditions for exiting the icing protection state and the low temperature protection state, dynamically determining the target waiting time based on the ambient temperature, and dynamically calculating the exit temperature threshold based on the difference between the vehicle interior temperature and the panel set temperature, the system becomes more intelligent and accurate when exiting the protection state, avoiding temperature fluctuations or equipment damage caused by exiting the protection state too early or too late. The entry and exit control logic for low temperature protection and icing protection states achieves intelligent switching of protection states by dynamically calculating the exit temperature threshold and waiting time, thereby improving the system's adaptability and protection accuracy.

[0028] In some embodiments, step S4 further includes an optimization operation control step: S43. When the air conditioning system is in low-temperature protection mode, and the evaporator temperature... The electric compressor will continue to run while the mechanical compressor remains off, provided the following conditions are met: Evaporator temperature >Ice protection trigger temperature And evaporator temperature Dynamically exit temperature threshold ; It should be noted that, based on the optimized operation control steps, under low temperature protection, when the evaporator temperature meets specific conditions, the electric compressor is kept running while the mechanical compressor is kept off. This fully utilizes the advantages of the electric compressor under low load conditions, reduces energy consumption, and avoids unnecessary start-stop of the mechanical compressor, thus extending the equipment life. For example, during operation in low-temperature protection mode, if the evaporator temperature is monitored... =4℃, meeting the "icing protection trigger temperature" requirement. =-1℃< =4℃ < Dynamic Exit Temperature Threshold Under the condition of "=8℃", the system maintains the operation of the electric compressor and keeps the mechanical compressor off to ensure stable cooling under low heat load conditions and avoid frequent compressor switching. Parking cooling state triggering and execution: If the driver does not turn off the air conditioning cooling request after parking, and the engine speed signal is 0 r / min, the system determines that it is in parking cooling mode and directly starts the electric compressor to cool the vehicle. The cooling capacity is determined according to... and Dynamic adjustment of the difference (e.g.) =28℃ At 24℃, the electric compressor runs at medium speed. =25℃ At 24℃, the electric compressor operates at low speed.

[0029] Compressor disabled state trigger: If the air conditioning cooling request is valid, but the engine speed is 600 rpm (not zero and below the speed threshold of 800 rpm), the system will prohibit the mechanical compressor and electric compressor from starting, and will display a "Compressor not ready" message on the air conditioning panel to avoid compressor damage due to insufficient speed.

[0030] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. 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 embodiments of the present invention.

[0031] like Figure 3As shown, the following are embodiments of the dual-mode air conditioning control and protection system for commercial vehicles with multiple temperature sensors provided in this disclosure. This system and the dual-mode air conditioning control and protection methods for commercial vehicles with multiple temperature sensors described in the above embodiments belong to the same inventive concept. For details not described in detail in the embodiments of the dual-mode air conditioning control and protection system for commercial vehicles with multiple temperature sensors, please refer to the embodiments of the dual-mode air conditioning control and protection methods for commercial vehicles with multiple temperature sensors described above.

[0032] The system includes: The operating parameter acquisition module is used to acquire the operating parameters of the dual-mode air conditioning system in commercial vehicles; the operating parameters include engine speed signal, air conditioning cooling request signal, and ambient temperature. Evaporator temperature Car interior temperature and panel set temperature ; The operating status determination module is used to determine the current operating status of the dual-mode air conditioner based on the operating parameters; the current operating status includes driving cooling status, parking cooling status, or compressor inactive status; The protection parameter selection module is used to select parameters based on the ambient temperature when the vehicle is in driving cooling mode. Evaporator temperature Car interior temperature and panel set temperature Select the parameters for the low-temperature protection logic; The compressor control and protection execution module is used to control the start and stop of the mechanical compressor and the electric compressor based on the parameters of the selected low temperature protection logic, and to execute the low temperature protection logic to control the entry and exit of the low temperature protection state and the icing protection state.

[0033] This embodiment achieves reduced compressor start-stop frequency, lower air conditioning system energy consumption, extended equipment life, and improved vehicle interior temperature stability and passenger comfort through the interactive collaboration of the operating parameter acquisition module, operating status judgment module, protection parameter selection module, and compressor control and protection execution module.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling and protecting a dual-mode air conditioning system for commercial vehicles using multiple temperature sensors, characterized in that, Includes the following steps: S1. Obtain the operating parameters of the commercial vehicle's dual-mode air conditioning; the operating parameters include engine speed signal, air conditioning cooling request signal, and ambient temperature. Evaporator temperature Car interior temperature and panel set temperature ; S2. Determine the current operating status of the dual-mode air conditioner based on the operating parameters; the current operating status includes driving cooling status, parking cooling status, or compressor disabled status; S3. When the operating status is vehicle cooling mode, then based on the ambient temperature... Evaporator temperature Car interior temperature and panel set temperature Select the parameters for the low-temperature protection logic; S4. Based on the parameters of the selected low-temperature protection logic, control the start and stop of the mechanical compressor and the electric compressor, execute the low-temperature protection logic, and control the entry and exit of the low-temperature protection state and the icing protection state.

2. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 1, characterized in that, The specific steps of step S2 are as follows: S21. A speed threshold for the engine is preset based on the engine idle speed, and the speed threshold can ensure that the mechanical compressor can be driven normally; S22. Determine the status of the air conditioning cooling request signal and the engine speed signal; If the air conditioning cooling request is valid and the engine speed is greater than or equal to the speed threshold, it is determined to be in driving cooling state, and proceed to step S3; If the air conditioning cooling request is valid and the engine speed is zero, it is determined to be in parking cooling mode, and the electric compressor is started to cool. If the air conditioning cooling request is valid, but the engine speed is not zero and is below the speed threshold, then starting the mechanical compressor and electric compressor is prohibited.

3. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 2, characterized in that, The parameters selected for the low-temperature protection logic in step S3 include the low-temperature protection trigger temperature. Ice-freezing protection trigger temperature Ice protection deactivation temperature Basic judgment waiting time t and basic low-speed protection end temperature .

4. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 3, characterized in that, The specific steps of step S4 are as follows: S41. Based on evaporator temperature Low temperature protection trigger temperature Ice-freezing protection trigger temperature The relationship between the air conditioning system and the vehicle's cooling system is used to gradually transition the air conditioning system from the vehicle's cooling state to the low-temperature protection state or the icing protection state. S42. Based on evaporator temperature And combined with the temperature inside the vehicle Temperature set on the panel Dynamically calculated dynamic exit temperature threshold, and / or based on ambient temperature. The dynamically calculated waiting time controls the air conditioning system to exit either the icing protection state or the low temperature protection state.

5. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 4, characterized in that, The specific steps of step S41 are as follows: S411. When the vehicle is in cooling mode and the mechanical compressor is running, if the evaporator temperature is detected... Continuously below the low temperature protection trigger temperature Once the first preset time period is reached, the mechanical compressor is shut down, and the electric compressor is started after the second preset time period, so that the air conditioning system enters the low temperature protection state. S412. When the air conditioning system is in low-temperature protection mode, if the evaporator temperature is monitored... Continuously below the freezing protection trigger temperature Once the third preset time period is reached, the electric compressor will be shut down, putting the system into an icing protection state.

6. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 5, characterized in that, Dynamic exit temperature threshold Determined in the following ways: Calculate the temperature difference inside the car : ; Temperature difference inside the car It is compared with several consecutive preset temperature difference intervals, each temperature difference interval corresponding to a preset exit temperature adjustment value; Based on the temperature difference inside the car The temperature range in which it is located will determine the end temperature of the basic low-speed protection. Adding the corresponding exit temperature adjustment value yields the dynamic exit temperature threshold. .

7. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 6, characterized in that, The specific steps of step S42 are as follows: S421. When the air conditioning system is in icing protection mode, start the timer and adjust the timer according to the ambient temperature. Dynamically determine the target waiting time required to exit protection. ; When the accumulated time reaches the target waiting time And the current evaporator temperature Higher than the freezing protection deactivation temperature When this happens, restart the electric compressor to allow the air conditioning system to exit the icing protection state and return to the low temperature protection state; S422. When the air conditioning system is in low-temperature protection mode, it adjusts according to the interior temperature. The difference between the temperature and the set temperature Td on the panel Dynamically calculate the dynamic exit temperature threshold ; If the evaporator temperature is monitored Above the dynamic exit temperature threshold If the system shuts down the electric compressor, it will start the mechanical compressor after the fourth preset time, causing the air conditioning system to exit the low-temperature protection state and return to the driving cooling state.

8. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 7, characterized in that, Target waiting time Determined in the following ways: Calculate ambient temperature difference : ,in, The preset required cooling reference temperature; Determine the ambient temperature difference Is it below the preset temperature difference threshold? If so, the timer will be stopped and reset, and the air conditioning system will remain in icing protection mode. Otherwise, the ambient temperature difference It is compared with several consecutive preset temperature difference intervals, each temperature difference interval corresponding to a preset waiting time coefficient; According to the ambient temperature difference The target waiting time is obtained by multiplying the basic judgment waiting time t by the corresponding waiting time coefficient within the temperature difference range. .

9. The method for dual-mode air conditioning control and protection of commercial vehicles with multiple temperature sensors according to claim 6, characterized in that, Step S4 also includes optimizing the operation control steps: S43. When the air conditioning system is in low-temperature protection mode, and the evaporator temperature... The electric compressor will continue to run while the mechanical compressor remains off, provided the following conditions are met: Evaporator temperature >Ice protection trigger temperature And evaporator temperature Dynamically exit temperature threshold .

10. A method and system for controlling and protecting a dual-mode air conditioning system for commercial vehicles using multiple temperature sensors, characterized in that, include: The operating parameter acquisition module is used to acquire the operating parameters of the dual-mode air conditioning system in commercial vehicles; the operating parameters include engine speed signal, air conditioning cooling request signal, and ambient temperature. Evaporator temperature Car interior temperature and panel set temperature ; The operating status determination module is used to determine the current operating status of the dual-mode air conditioner based on the operating parameters; the current operating status includes driving cooling status, parking cooling status, or compressor inactive status; The protection parameter selection module is used to select parameters based on the ambient temperature when the vehicle is in driving cooling mode. Evaporator temperature Car interior temperature and panel set temperature Select the parameters for the low-temperature protection logic; The compressor control and protection execution module is used to control the start and stop of the mechanical compressor and the electric compressor based on the parameters of the selected low temperature protection logic, and to execute the low temperature protection logic to control the entry and exit of the low temperature protection state and the icing protection state.

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