Method and device for obtaining remaining use time of stationary air conditioner of commercial vehicle

Abstract

This invention discloses a method and dedicated device for obtaining the remaining usage time of a commercial vehicle's parking air conditioner. The method includes the following steps: determining whether the current vehicle operating mode is parking state Y or non-parking state N; calculating the remaining usage time of the parking air conditioner based on the vehicle operating mode in step 1); and obtaining the current battery operating parameter C when the vehicle operating mode is parking state Y. a and I avg（n‑1） And according to T n =C a / I avg（n‑1） The remaining usage time of the parking air conditioner is calculated as follows: When the vehicle's operating mode is non-parking (N), the parking air conditioner is not in operation, and its remaining usage time is not calculated. The calculation method and device of this invention can be matched with common inverter and fixed-frequency air conditioners on the market. The battery can be a lithium battery (such as a lithium iron phosphate battery) or a lead-acid battery. Parameters can also be adjusted according to the vehicle, making it widely applicable and highly practical.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle parking air conditioning usage management, and particularly to a method and device for obtaining the remaining usage time of a parking air conditioning system. Background Technology

[0002] A commercial vehicle parking air conditioner is a type of in-vehicle air conditioner commonly used in commercial vehicles. It is powered by the vehicle's battery (usually 24V) to meet the user's comfort and cooling needs.

[0003] Surveys show that long-haul truck users spend 80% of their time on the road throughout the year, and 47.4% choose to sleep overnight in their vehicles. Therefore, the user experience of parking air conditioning is crucial. Parking air conditioning is powered by the vehicle's battery when the vehicle is parked and by the engine when it is not parked. Once the engine starts, it drives the alternator, which provides power. Users often encounter situations where the parking air conditioning automatically shuts off due to insufficient battery power or drains the battery too much, preventing the vehicle from starting.

[0004] Current parking air conditioner usage time is calculated by dividing the battery's available capacity by the rated current. This calculation method is very crude and is only used as a reference for users when selecting batteries and parking air conditioners. It is not actually used to calculate usage time and is mostly estimated verbally by car owners or battery and parking air conditioner sellers. The error of the current calculation method is measured in hours. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for calculating the remaining usage time of a commercial vehicle's parking air conditioner. This method informs the user of the remaining usage time of the parking air conditioner when the vehicle is parked. The remaining time obtained by this method is more accurate and reliable.

[0006] Another objective of this invention is to provide a dedicated device for obtaining the remaining usage time of the parking air conditioner in the aforementioned commercial vehicle.

[0007] A method for obtaining the remaining usage time of a commercial vehicle's parking air conditioner includes the following steps:

[0008] 1) Determine whether the current vehicle operating mode is parked (Y) or non-parked (N);

[0009] 2) Calculate the remaining usage time of the parking air conditioner based on the vehicle operating mode in step 1);

[0010] When the vehicle is in parking mode (Y), obtain the current battery operating parameters (C). a and I avg（n-1） And according to T n =C a / I avg（n-1）Remaining usage time of the parking air conditioner;

[0011] Among them, C a This represents the battery's current allowable discharge capacity.

[0012] I avg（n-1） The average discharge current of the battery during the (n-1)th working cycle of the parking air conditioner;

[0013] T n This represents the remaining usage time of the parking air conditioner during the nth cycle, i.e., the remaining usage time of the parking air conditioner.

[0014] When the vehicle is in non-parking state N, the battery does not supply power to the parking air conditioner, and the remaining usage time of the parking air conditioner is not calculated; the battery is the on-board battery used to start the vehicle and supply power to the parking air conditioner when in parking state Y.

[0015] The method for determining the current vehicle operating mode in step 1) is as follows:

[0016] The default vehicle operating mode is non-parking (N), and the real-time battery current value (I) is monitored. x ;

[0017] When the current value I at the current moment x If the current value is simultaneously in the range of 5A to 100A for the next 3 to 5 consecutive moments, then the vehicle's operating mode is determined to have changed from non-parking state N to parking state Y.

[0018] And when the current value I at the current moment x If the current value is less than 0A for 3 to 5 consecutive time intervals, then the vehicle's operating mode is determined to have changed from parking state Y to non-parking state N.

[0019] In step 2), through C a =F*(C*SOC*SOH-C*SOC re / SOH) Get the current C a ;

[0020] in,

[0021] F represents the battery fault status value;

[0022] C represents the battery's rated capacity;

[0023] SOC is the percentage of the battery's current remaining capacity.

[0024] SOH indicates the battery's health status;

[0025] SOC re Reserved percentage of battery capacity.

[0026] SOC reThe method of obtaining it is:

[0027] When the vehicle's operating mode is determined to change from non-parking state N to parking state Y, the average battery temperature (Temp) for the first 3-5 seconds is obtained, and the corresponding SOC is selected based on the Temp. re .

[0028] In step 2), the average battery discharge current I during the (n-1)th working cycle of the parking air conditioner is... avg（n-1） The method for obtaining it is as follows:

[0029] I avg（n-1） =[I （n-1）1 +I （n-1）2 +I （n-1）3 +…+I （n-1）m ] / m;

[0030] in,

[0031] I （n-1）m This is the m-th current acquisition value of the battery in the (n-1)th working cycle of the parking air conditioner;

[0032] When the parking air conditioner is turned on, it defaults to entering the first cycle, i.e., when n=1, I avg（n-1） =(I1+I2+I3+…+I m ) / m;

[0033] When I （n-1）m / I （n-1）（m-1） >3 and I （n-1）（m+1） / I （n-1）m >3 and I （n-1）（m+2） / I （n-1）（m+1） When the value is greater than 3, it is determined that the parking air conditioner has entered the nth cycle from the (n-1)th cycle.

[0034] A dedicated device for obtaining the remaining usage time of a commercial vehicle parking air conditioner as described in the above technical solution includes:

[0035] A battery parameter monitoring module used to acquire battery voltage, current, and temperature data;

[0036] A display module used to show the remaining usage time of the parking air conditioner;

[0037] A sound prompt module is used to remind the user when the remaining usage time of the parking air conditioner is close to 0.

[0038] The data processing module is used to store the data acquired by the battery parameter monitoring module and control the display module and sound prompt module after processing; the data processing module calculates the remaining usage time of the parking air conditioner based on the data acquired by the battery parameter monitoring module.

[0039] The battery parameter monitoring module is connected to the input end of the data processing module via a signal line, and the display module and the sound prompt module are connected to the output end of the data processing module.

[0040] Compared to existing technologies, this invention can intuitively inform users of the remaining usage time of the parking air conditioner, allowing drivers to rationally plan their rest time and even enhance the user's high-tech sensory experience through precise remaining usage time. It also prevents excessive battery drain that could prevent the vehicle from starting, saving time, manpower, and resources. Furthermore, knowing the remaining usage time of the parking air conditioner allows drivers to more accurately control battery charging time, resulting in more efficient fuel utilization and ultimately energy conservation and emission reduction. The calculation method of this invention can control errors within a few minutes. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating the method for obtaining the remaining usage time of the vehicle parking air conditioner according to the present invention;

[0043] Figure 2 This is a schematic diagram of the module of the special device of the present invention. Detailed Implementation

[0044] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] Figure 1 This is a flowchart illustrating the method for obtaining the remaining usage time of the vehicle parking air conditioner according to the present invention.

[0046] A method for calculating the remaining usage time of a parking air conditioner, the method comprising the following steps:

[0047] 1) Determine whether the vehicle's operating mode is parked (Y) or not parked (N);

[0048] 2) Calculate the remaining usage time of the parking air conditioner based on the vehicle operating mode in step 1);

[0049] When the vehicle is in parking mode (Y), acquire the battery operating parameters and adjust C according to the battery operating parameters. aI avg（n-1） At least one of them;

[0050] in,

[0051] C a This refers to the battery's allowable discharge capacity.

[0052] I avg（n-1） This represents the average discharge current of the battery during the (n-1)th working cycle of the parking air conditioner.

[0053] Calculate the remaining usage time of the parking air conditioner:

[0054] T n =C a / I avg（n-1）

[0055] in,

[0056] T n This is the remaining usage time of the parking air conditioner in the nth cycle, which is the remaining usage time of the parking air conditioner.

[0057] C a The specific method for obtaining it is C. a =F*(C*SOC*SOH-C*SOC re / SOH);

[0058] in,

[0059] F represents the battery fault status value; the battery fault status value F is adjusted according to the battery fault status.

[0060] When the battery has a fault that prevents it from discharging, the F value is 0;

[0061] When the battery does not have a fault that prevents it from discharging, the F value is 1. F mainly considers the application of lithium batteries. The F value is detected by the battery parameter monitoring module through real-time battery voltage, temperature and current. For existing lithium batteries, it is necessary to consider the situation where the battery is faulty or cannot be used under extreme conditions. For example, if the battery is close to the engine and the temperature is very high, turning on the air conditioner will consume too much power and the battery temperature may be too high, which may pose a risk of heat dissipation. Therefore, it cannot be used in some cases, and the remaining usage time of the parking air conditioner will be 0.

[0062] C represents the battery's rated capacity;

[0063] SOC is the percentage of the battery's current remaining capacity.

[0064] SOH represents the battery health status; the calculation methods for the current remaining capacity percentage (SOC) and battery health status (SOH) are existing technologies and will not be elaborated upon in this invention. SOC / SOH is a real-time estimate of the available capacity.

[0065] SOCre Reserved percentage of battery capacity. SOC re The method for obtaining the temperature is as follows: when the vehicle's operating mode changes from non-parking state N to parking state Y, the average temperature Temp of the battery in the first 3 to 5 seconds is obtained, and the corresponding SOC is selected based on Temp. re SOCre / SOH represents the reserved battery capacity for starting the vehicle. The older the battery, the more it degrades, and the higher the reserved SOC needs to be. SOCre is derived from a table and needs to be adjusted in real time to account for the different starting capacities required by the vehicle at different temperatures.

[0066] Obtain the average battery discharge current I during the (n-1)th working cycle of the parking air conditioner. avg（n-1） I avg（n-1） The specific method for obtaining it is I avg（n-1） =[I （n-1）1 +I （n-1）2 +I （n-1）3 +…+I （n-1）m ] / m;

[0067] in,

[0068] I （n-1）m This is the m-th current acquisition value of the battery in the (n-1)-th working cycle of the parking air conditioner.

[0069] When the vehicle is in non-parking mode N, the parking air conditioner is powered by the car engine and the battery does not supply power to the parking air conditioner, so the remaining usage time of the parking air conditioner is not calculated. In non-parking mode N, even if the parking air conditioner is working, it can be powered by the alternator. In this case, there is no need to calculate the remaining usage time, and it can be used continuously when the vehicle is running.

[0070] The battery powers the parking air conditioner.

[0071] The method for determining the current vehicle operating mode is as follows:

[0072] The initial default vehicle operating mode is non-parked (N). The system continuously monitors the real-time battery current; when 100A > I... x >5A and 100A>I x+1 >5A and 100A>I x+2 >5A and 100A>I x+3 >5A and 100A>I x+5 If the value is greater than 5A, then the vehicle's operating mode is determined to have changed from non-parking state N to parking state Y.

[0073] When the vehicle is in parking mode Y, the real-time current value of the battery is constantly monitored. x <0 and I x+1 <0 and I x+2 <0 and Ix+3 <0 and I x+4 When <0, the vehicle's operating mode is determined to change from parking state Y to non-parking state N;

[0074] Among them, I x This is the xth current measurement value of the battery, which is the power supply battery for the parking air conditioner.

[0075] Obtain the average battery discharge current I during the (n-1)th working cycle of the parking air conditioner. avg（n-1） I avg（n-1） =[I （n-1）1 +I （n-1）2 +I （n-1）3 +…+I （n-1）m ] / m;

[0076] When the parking air conditioner is turned on, it defaults to entering the first cycle, i.e., when n=1, I avg（n-1） =(I1+I2+I3+…+I m ) / m;

[0077] When I （n-1）m / I （n-1）（m-1） >3 and I （n-1）（m+1） / I （n-1）m >3 and I （n-1）（m+2） / I （n-1）（m+1） When the value is greater than 3, the parking air conditioner enters the nth cycle from the (n-1)th cycle. This judgment confirms the end of the previous cycle and enters the next cycle, thereby confirming the value of m.

[0078] Figure 2 In the second aspect of this invention, a dedicated device for obtaining the remaining usage time of a commercial vehicle parking air conditioner as described above is disclosed, the device comprising:

[0079] The battery parameter monitoring module is used to acquire the current voltage, current and temperature data of the battery. The current voltage, current and temperature data of the battery are equivalent to the operating parameters of the parking air conditioner.

[0080] The data processing module stores data from the battery parameter monitoring module and the software program for calculating the remaining usage time of the parking air conditioner. It can also calculate the remaining usage time of the parking air conditioner based on this calculation method.

[0081] The display module (screen) is used to display the remaining usage time of the parking air conditioner;

[0082] The sound alert module is used to remind the user when the remaining usage time of the parking air conditioner is close to 0.

[0083] The battery parameter monitoring module is connected to the input terminal of the data processing module via a signal line, and the display module and sound prompt module are connected to the output terminal of the data processing module.

[0084] From the user's perspective, informing them of the remaining usage time of the parking air conditioner allows them to plan their rest time accordingly, and even enhances their high-tech sensory experience through precise remaining usage time. It also prevents the battery from draining too much and preventing the vehicle from starting, saving time, manpower, and resources.

[0085] From the vehicle's perspective, knowing the remaining usage of the parking air conditioner allows users to more accurately control battery charging time, making more efficient use of fuel and thus saving energy and reducing emissions.

[0086] The calculation method and apparatus of this invention can be matched with common variable frequency air conditioners and fixed frequency air conditioners on the market. The battery can be a lithium battery (such as a lithium iron phosphate battery) or a lead-acid battery. The parameters can also be adjusted according to the vehicle. It has a wide range of applications and strong practicality.

[0087] In one embodiment, the battery parameter monitoring module is connected to and communicates with the battery management system of the battery, and the data processing module is a PLC, a microcontroller, or an electronic control unit (ECU) of a commercial vehicle.

[0088] In another embodiment, the battery parameter monitoring module is the sampling input module of the battery management system, and the data processing module is the main control module of the battery management system.

[0089] Example 1

[0090] The parking air conditioner is a 24V inverter type, and the battery is a 25.6V 200Ah lithium iron phosphate battery. The method for calculating the remaining usage time of the parking air conditioner includes the following steps:

[0091] 1) The initial default vehicle operating mode is non-parking state N, and the real-time current value of the battery is detected by the battery parameter monitoring module; based on this current value, the current vehicle operating mode is determined to be either parking state Y or non-parking state N.

[0092] 2) Calculate the remaining usage time of the parking air conditioner based on the vehicle operating mode in step 1);

[0093] When the vehicle is in non-parking state N, which does not meet the requirements for parking air conditioning operation, the engine supplies power to the parking air conditioning in this state. There is no need to calculate the remaining usage time of the parking air conditioning, and the display module in the device does not display the remaining usage time.

[0094] When the vehicle is in parking mode Y, which means the parking air conditioner is in operation, the remaining usage time of the parking air conditioner is calculated and the display module in the device starts to display the remaining usage time.

[0095] Obtain the operating parameters of the parking air conditioning battery, and adjust C according to the battery's operating parameters. a I avg（n-1） At least one of them, according to Tn =C a / I avg（n-1） Calculate the remaining usage time of the parking air conditioner;

[0096] Among them, C a =F*(C*SOC*SOH-C*SOC re / SOH);

[0097] Obtain the battery fault status value F. When the battery does not have a non-discharge fault, F=1; when the battery has a non-discharge fault, F=0.

[0098] The battery is not allowed to discharge, specifically including but not limited to at least one of the following situations:

[0099] a) The voltage of a single battery cell is too low (e.g., below 2.5V);

[0100] b) The total voltage of the battery pack is too low (e.g., below 20V);

[0101] c) The voltage difference between individual battery cells is too large (e.g., greater than 300mV);

[0102] d) Battery temperature is too high (e.g., above 60°C);

[0103] e) Excessive battery temperature difference (e.g., greater than 5°C);

[0104] f) Temperature acquisition failure (e.g., open circuit in the acquisition loop);

[0105] g) Voltage acquisition failure (such as open circuit in the acquisition circuit);

[0106] h) Current acquisition fault (e.g., excessive zero drift);

[0107] It should be noted that throughout the calculation of the remaining usage time of the parking air conditioner, the device continuously acquires the battery fault status and updates the F value in real time.

[0108] C is the rated capacity of the battery, here C=200Ah;

[0109] SOC is the percentage of remaining battery capacity, calculated in real time. The calculation method is existing technology and will not be described in detail in this embodiment. The value range is 0~100%.

[0110] SOH is the battery health level, calculated in real time. The calculation method is existing technology and will not be described in detail in this embodiment. The value range is 0~100%.

[0111] SOC re This is the percentage of reserved battery capacity, which can be found in the table below:

[0112] Temp (°C) -40≤Temp<-15 -15≤Temp<0 0≤Temp<15 15≤Temp<60 <![CDATA[SOC re ]]> 20% 15% 10% 5%

[0113] The Temp value is the average temperature collected by the battery parameter monitoring module in the first 3 seconds after the device determines that the vehicle's working mode is parked (Y).

[0114] Obtain the average battery discharge current I during the (n-1)th working cycle of the parking air conditioner. avg（n-1） I avg（n-1） =[I （n-1）1 +I （n-1）2 +I （n-1）3 +…+I （n-1）m ] / m;

[0115] When the parking air conditioner is turned on, it defaults to entering the first cycle, i.e., when n=1, I avg（n-1） =(I1+I2+I3+…+I m ) / m;

[0116] When I （n-1）m / I （n-1）（m-1） >3 and I （n-1）（m+1） / I （n-1）m >3 and I （n-1）（m+2） / I （n-1）（m+1） When the value is greater than 3, the parking air conditioner enters the nth cycle from the (n-1)th cycle.

[0117] The display module shows the remaining usage time of the parking air conditioner (T). n Display format: --h--min, where hours and minutes are both integers.

[0118] When the remaining usage time drops to 0 hours and 5 minutes, the sound prompt module will emit a warning sound to remind the user that the battery power is low and the vehicle needs to be started as soon as possible.

[0119] It should be noted that when the battery fault status value F=0 during the use of the parking air conditioner, the remaining usage time of the parking air conditioner immediately becomes 0, the digital display module displays 0h0min, and the sound prompt module emits a prompt sound simultaneously.

[0120] Example 2

[0121] The parking air conditioner is a 24V fixed-frequency parking air conditioner, and the battery is a 25.6V 100Ah lithium iron phosphate battery. The method for calculating the remaining usage time of the parking air conditioner includes the following steps:

[0122] 1) The initial default vehicle operating mode is non-parking state N, and the real-time current value of the battery is detected by the battery parameter monitoring module; the current operating mode of the vehicle is determined to be either parking state Y or non-parking state N based on the current value.

[0123] 2) Calculate the remaining usage time of the parking air conditioner based on the vehicle operating mode in step 1);

[0124] When the vehicle is in non-parking state N, that is, the parking air conditioner is not in operation, the remaining usage time of the parking air conditioner is not calculated, and the display module in the device does not display the remaining usage time.

[0125] When the vehicle is in parking mode Y, which means the parking air conditioner is in operation, the remaining usage time of the parking air conditioner is calculated and the display module in the device starts to display the remaining usage time.

[0126] Obtain the operating parameters of the parking air conditioner's power supply battery, and adjust C according to the battery's operating parameters. a I avg（n-1） At least one of them, according to T n =C a / I avg（n-1） Calculate the remaining usage time of the parking air conditioner;

[0127] Among them, C a =F*(C*SOC*SOH-C*SOC re / SOH);

[0128] Obtain the battery fault status value F. When the battery does not have a non-discharge fault, F=1; when the battery has a non-discharge fault, F=0.

[0129] The battery is not allowed to discharge, specifically including but not limited to at least one of the following situations:

[0130] a) The voltage of a single battery cell is too low (e.g., below 2.5V);

[0131] b) The total voltage of the battery pack is too low (e.g., below 20V);

[0132] c) The voltage difference between individual battery cells is too large (e.g., greater than 300mV);

[0133] d) Battery temperature is too high (e.g., above 60°C);

[0134] e) Excessive battery temperature difference (e.g., greater than 5°C);

[0135] f) Temperature acquisition failure (e.g., open circuit in the acquisition loop);

[0136] g) Voltage acquisition failure (such as open circuit in the acquisition circuit);

[0137] h) Current acquisition fault (e.g., excessive zero drift);

[0138] It should be noted that throughout the calculation of the remaining usage time of the parking air conditioner, the device continuously acquires the battery fault status and updates the F value in real time.

[0139] C is the rated capacity of the battery, here C=100Ah;

[0140] SOC is the percentage of remaining battery capacity, calculated in real time. The calculation method is existing technology and will not be described in detail in this embodiment. The value range is 0~100%.

[0141] SOH is the battery health level, calculated in real time. The calculation method is existing technology and will not be described in detail in this embodiment. The value range is 0~100%.

[0142] SOC re This is the percentage of reserved battery capacity, which can be found in a table. The table is as follows:

[0143] Temp (°C) -40≤Temp<-15 -15≤Temp<0 0≤Temp<15 15≤Temp<60 <![CDATA[SOC re ]]> 40% 30% 20% 10%

[0144] The Temp value is the average temperature collected by the battery parameter monitoring module in the first 3 seconds after the device determines that the vehicle's operating mode is Y.

[0145] Obtain the average battery discharge current I during the (n-1)th working cycle of the parking air conditioner. avg（n-1） I avg（n-1） =[I （n-1）1 +I （n-1）2 +I （n-1）3 +…+I （n-1）m ] / m;

[0146] When the parking air conditioner is turned on, it defaults to entering the first cycle, i.e., when n=1, I avg（n-1） =(I1+I2+I3+…+I m ) / m;

[0147] When I （n-1）m / I （n-1）（m-1） >3 and I （n-1）（m+1） / I （n-1）m >3 and I （n-1）（m+2） / I （n-1）（m+1） When the value is greater than 3, the parking air conditioner enters the nth cycle from the (n-1)th cycle.

[0148] If the fixed-frequency air conditioner does not have I （n-1）m / I （n-1）（m-1） >3 and I （n-1）（m+1） / I （n-1）m >3 and I （n-1）（m+2） / I （n-1）（m+1） If the value is greater than 3, then the first cycle will always be maintained.

[0149] The display module shows the remaining usage time of the parking air conditioner (T). n Display format: --h--min, where hours and minutes are both integers.

[0150] When the remaining usage time drops to 0 hours and 5 minutes, the sound prompt module will emit a warning sound to remind the user that the battery power is low and the vehicle needs to be started as soon as possible.

[0151] It should be noted that when the battery fault status value F=0 during the use of the parking air conditioner, the remaining usage time of the parking air conditioner immediately becomes 0, the digital display module displays 0h0min, and the sound prompt module emits a prompt sound simultaneously.

Claims

1. A method for obtaining the remaining usage time of a commercial vehicle's parking air conditioner, characterized in that: Includes the following steps: 1) Determine whether the current vehicle operating mode is parked (Y) or non-parked (N); 2) Calculate the remaining usage time of the parking air conditioner based on the vehicle operating mode in step 1); When the vehicle is in parking mode (Y), obtain the current battery operating parameters (C). a and I avg（n-1） And according to T n =C a / I avg（n-1） Remaining usage time of the parking air conditioner; Among them, C a This refers to the battery's current allowable discharge capacity. I avg（n-1） The average discharge current of the battery during the (n-1)th working cycle of the parking air conditioner; T n This represents the remaining usage time of the parking air conditioner during the nth cycle, i.e., the remaining usage time of the parking air conditioner. When the vehicle is in non-parking state N, the remaining usage time of the parking air conditioner is not calculated. The battery is an onboard battery that powers the parking air conditioner.

2. The method for obtaining the remaining usage time of a commercial vehicle parking air conditioner according to claim 1, characterized in that: The method for determining the current vehicle operating mode in step 1) is as follows: The default vehicle operating mode is non-parking (N), and the real-time battery current value (I) is monitored. x ; When the current value I at the current moment x If the current value is simultaneously in the range of 5A to 100A for the next 3 to 5 consecutive moments, then the vehicle's operating mode is determined to have changed from non-parking state N to parking state Y. And when the current value I at the current moment x If the current value is less than 0A for 3 to 5 consecutive time intervals, then the vehicle's operating mode is determined to have changed from parking state Y to non-parking state N.

3. A method for obtaining the remaining usage time of a commercial vehicle parking air conditioner according to claim 1 or 2, characterized in that: In step 2), through C a =F*(C*SOC*SOH-C*SOC re / SOH) Get the current C a ; in, F represents the battery fault status value; C represents the rated capacity of the battery; SOC is the percentage of the battery's current remaining capacity. SOH indicates the battery's health status; SOC re Reserved percentage of battery capacity.

4. The method for obtaining the remaining usage time of a commercial vehicle parking air conditioner according to claim 3, characterized in that: SOC re The method of obtaining it is: When the vehicle's operating mode is determined to change from non-parking state N to parking state Y, the average battery temperature (Temp) for the first 3-5 seconds is obtained, and the corresponding SOC is selected based on the Temp. re .

5. A method for obtaining the remaining usage time of a commercial vehicle parking air conditioner according to claim 1, 2, or 4, characterized in that: In step 2), the average battery discharge current I during the (n-1)th working cycle of the parking air conditioner is... avg（n-1） The method to obtain it is as follows: I avg（n-1） =[I （n-1）1 +I （n-1）2 +I （n-1）3 +…+I （n-1）m ] / m; in, I （n-1）m This is the m-th current acquisition value of the battery in the (n-1)th working cycle of the parking air conditioner; When the parking air conditioner is turned on, it defaults to entering the first cycle, i.e., when n=1, I avg（n-1） =(I1+I2+I3+…+I m ) / m; When I （n-1）m / I （n-1）（m-1） >3 and I （n-1）（m+1） / I （n-1）m >3 and I （n-1）（m+2） / I （n-1）（m+1） When the value is greater than 3, it is determined that the parking air conditioner has entered the nth cycle from the (n-1)th cycle.

6. A dedicated device for obtaining the remaining usage time of a commercial vehicle parking air conditioner as described in claim 1, characterized in that, include: A battery parameter monitoring module used to acquire battery voltage, current, and temperature data; A display module used to show the remaining usage time of the parking air conditioner; A sound prompt module is used to remind the user when the remaining usage time of the parking air conditioner is close to 0. A data processing module used to store data acquired by the battery parameter monitoring module and, after processing, control the display module and the sound prompt module; The data processing module calculates the remaining usage time of the parking air conditioner based on the data obtained from the battery parameter monitoring module; The battery parameter monitoring module is connected to the input end of the data processing module via a signal line, and the display module and the sound prompt module are connected to the output end of the data processing module.

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