Automobile air conditioning ventilation system and control method thereof

Abstract

The application provides an automobile air conditioner ventilation system and a control method thereof. The automobile air conditioner ventilation system has automatic control switching and self-adaptive functions, can intelligently determine the ventilation demand in the vehicle according to factors such as parking time, external temperature, illumination, driving mileage and the like, optimizes and removes VOC in the vehicle without increasing the cost of the whole vehicle, has good economy, and is switched to an automatic air conditioner operation mode after the ventilation control is completed, without affecting other functions of the automobile air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile air conditioning, in particular to an automobile air conditioning ventilation system and a control method thereof. BACKGROUND

[0002] With the rapid development of the automobile industry, the health and comfort of the cabin of the driver and passengers in the vehicle are increasingly demanding, and more and more attention is paid to the impact of volatile organic compounds VOC and odors emitted from the surface of the automotive interior on human health. Therefore, it is particularly important to propose a ventilation strategy and control method for optimizing VOC in the vehicle.

[0003] As an important part of people's life, automobile air conditioning can provide comfortable temperature for people in the vehicle throughout the year. At present, most automobile air conditioning systems use internal circulation in the summer to meet the strong cooling demand of people in the vehicle, which results in less air exchange between the inside and outside of the vehicle. In addition, the space in the vehicle is small and closed, and the leather and other interior materials are more likely to emit VOC at high temperatures, which makes it difficult to disperse VOC and other pollutants, thereby affecting human health.

[0004] Currently, there are three ways to remove VOC in the vehicle:

[0005] 1) Use a special activated carbon filter to adsorb VOC in the vehicle. This method is a physical or chemical adsorption process. Since it has a certain life cycle, when the activated carbon reaches adsorption saturation, its effect on removing VOC is not obvious.

[0006] 2) Use photocatalyst technology. Photocatalyst is a chemical catalytic method that requires light during use. When the types and concentrations of pollutants are high, the photocatalyst catalytic degradation rate is slow, and many harmful intermediate products are formed during the catalytic process, thereby affecting the purification effect.

[0007] 3) Use ozone catalysis. This method requires a certain concentration. When the human body is exposed to a high-concentration ozone environment for a long time, it will also harm the human body. For example, it can cause coughing, difficulty breathing, and even vision loss, and even life-threatening conditions.

[0008] And the above three solutions will increase the cost of the vehicle to varying degrees. SUMMARY

[0009] The application aims to solve the above problems, and provides an automobile air conditioning ventilation system and a control method thereof.

[0010] The application provides an automobile air conditioning ventilation system, which comprises an air conditioning control system, a vehicle body controller and a detection device.

[0011] In an embodiment, the detection device comprises an external temperature sensor, and the signal data obtained by the external temperature sensor is an external temperature.

[0012] In an embodiment, the detection device comprises a sunlight sensor, and the signal data obtained by the sunlight sensor is a sunlight value.

[0013] In an embodiment, the detection device comprises a wiper signal sensor, and the signal data obtained by the wiper signal sensor is a wiper signal.

[0014] In an embodiment, the detection device comprises a gearbox signal sensor, and the signal data obtained by the gearbox signal sensor is a gearbox signal.

[0015] In an embodiment, the detection device comprises a total mileage / usage time sensor, and the signal data obtained by the total mileage / usage time sensor is a total mileage / usage time.

[0016] In an embodiment, the detection device comprises a parking time sensor, and the signal data obtained by the parking time sensor is a parking time.

[0017] The application provides a control method of the automobile air conditioning ventilation system, which is used for controlling the automobile air conditioning ventilation system.

[0018] Step 201: calculating an external circulation ventilation target time according to the signal data;

[0019] Step 202: resetting an external circulation actual running time;

[0020] Step 203, based on the step 201 calculation of the outer cycle ventilation target time, forced outer cycle ventilation, ventilation and removal of VOC;

[0021] Step 204, during the ventilation process, the actual running time of the outer cycle is accumulated and calculated;

[0022] Step 205, determine whether the actual running time of the outer cycle is greater than the outer cycle ventilation target time, if the actual running time of the outer cycle is greater than the outer cycle ventilation target time, go to step 206, if the actual running time of the outer cycle is less than or equal to the outer cycle ventilation target time, return to step 203; and

[0023] Step 206, end the intelligent ventilation strategy, and enter the automatic control of the comfortable air conditioner.

[0024] In one embodiment, before the control method is started, the outer cycle ventilation target time is reset and recalculated to meet the needs of users in different environments.

[0025] In one embodiment, between the step 202 and the step 203, the following steps are further included:

[0026] Step 211, according to the gearbox signal, determine whether the current vehicle running state is a reverse state, if it is a reverse state, delay entering step 212, if it is not a reverse state, directly enter step 212;

[0027] Step 212, according to the wiper signal, determine whether the user is washing the glass, if it is a glass washing state, delay entering step 203, if it is not a glass washing state, directly enter step 203.

[0028] In one embodiment, in the step 211, if it is a reverse state, automatically switch to inner cycle, after the reverse is finished, delay for a certain time to enter step 212.

[0029] In one embodiment, in the step 212, if it is a glass washing state, automatically switch to inner cycle, after the glass washing is finished, delay for a certain time to enter step 203.

[0030] In one embodiment, the delay time is set to 15 seconds.

[0031] The application also proposes a calculation method of the outer cycle ventilation target time, which is used in the step 201 of the control method, and the calculation method of the outer cycle ventilation target time includes the following steps:

[0032] Step 301, the system is powered on, and the signal data is read in the database, the signal data includes: parking time, outdoor temperature, sunlight value, total mileage, total vehicle use time;

[0033] Step 302, calculating a base value of the external circulation ventilation target time according to the parking time;

[0034] Step 303, calculating a compensation value of the external circulation ventilation target time according to the external temperature and the sunlight value;

[0035] Step 304, calculating a compensation coefficient of the external circulation ventilation target time according to the total mileage and the total use time of the vehicle; and

[0036] Step 305, further calculating the external circulation ventilation target time according to the results calculated in steps 302-304, the external circulation ventilation target time = (the base value of the external circulation ventilation target time + the compensation value of the external circulation ventilation target time) * the compensation coefficient of the external circulation ventilation target time, and outputting the external circulation ventilation target time value to the main control program for the control of the automobile air conditioning ventilation system.

[0037] The present application has the following beneficial effects:

[0038] 1. The ventilation system in the present application can automatically identify and adapt to the vehicle state and external environment, and has an automatic control switching function. The ventilation system in the present application intelligently distinguishes the ventilation demand in the vehicle according to the parking time, external temperature, illumination, driving mileage and other factors, and accurately meets the ventilation demand of users in different environments.

[0039] 2. The present application can effectively remove the problems of VOC and odor in the vehicle without increasing the cost of the whole vehicle, and maintain the fresh air in the vehicle, which has good economic efficiency.

[0040] 3. The present application switches to the automatic air conditioning operation mode after the ventilation control is completed, and does not affect other functions of the automatic comfortable air conditioner, which has good applicability.

[0041] 4. The present application considers the influence of reversing or washing glass on the vehicle environment, avoids the entry of exhaust gas and glass washing agent into the vehicle, and maintains the fresh air in the vehicle.

[0042] 5. The present application adopts closed-loop control, and the control is more accurate. DETAILED DESCRIPTION

[0043] Figure 1 is a schematic structural diagram of an automobile air conditioning ventilation system of an embodiment of the present application;

[0044] Figure 2 is a flow chart of the control method of the automobile air conditioning ventilation system of an embodiment of the present application;

[0045] Figure 3 is a flow chart of the calculation method of the external circulation ventilation target time in the above control method;

[0046] Figure 4 is a parking time-based outside circulation ventilation target time basic value table;

[0047] Figure 5 is an outside temperature-based outside circulation ventilation target time compensation value table;

[0048] Figure 6 is a sunlight value-based outside circulation ventilation target time compensation value table;

[0049] Figure 7 is a total mileage-based outside circulation ventilation target time compensation coefficient table; and

[0050] Figure 8 is a total use time-based outside circulation ventilation target time compensation coefficient table. DETAILED DESCRIPTION

[0051] An embodiment of the present application will be described in detail below with reference to the accompanying drawings. The following embodiment is only descriptive and is not limiting, and the protection scope of the present application cannot be limited by the embodiment.

[0052] The automobile air conditioning ventilation system of the present application can automatically identify and adapt to the current vehicle operating state and external environment, and automatically match the ventilation time meeting the user's needs according to the vehicle operating state and external environment. The core of the control method of the automobile air conditioning ventilation system of the present application is the calculation method of the outside circulation ventilation target time, and the algorithm controls the ventilation demand of the vehicle in different states according to the obtained parameters.

[0053] Figure 1 The composition structure of the automobile air conditioning ventilation system of an embodiment of the present application is disclosed, which comprises a body controller BCM 101, a detection device, an air conditioner controller 108, a blower 109, a damper control motor 110, an inside-outside circulation damper 111 and an air conditioner filter element 112.

[0054] The detection device is used to obtain signal data. The obtained signal data is processed by the body controller BCM 101 into a CAN signal and sent to the air conditioner controller 108. The air conditioner controller 108 obtains a control signal after calculation and processing according to the obtained CAN signal, and sends it to the blower 109 and the damper control motor 110 for intelligent ventilation and air exchange to remove VOC in the vehicle.

[0055] As shown in Figure 1 The detection device comprises an outside temperature sensor 102, a sunlight sensor 103, a gearbox signal sensor 104, a windshield wiper signal sensor 105, a total mileage / use time sensor 106 and a parking time sensor 107.

[0056] Wherein, the signal data acquired by the outside temperature sensor 102 is outside temperature. The signal data acquired by the sunlight sensor 103 is sunlight value. The signal data acquired by the gearbox signal sensor 104 is gearbox signal. The signal data acquired by the wiper signal sensor 105 is wiper signal. The signal data acquired by the vehicle total mileage / service time sensor 106 is vehicle total mileage / service time. The signal data acquired by the parking time sensor 107 is parking time.

[0057] The control method of the automobile air conditioning ventilation system according to an embodiment of the present application is shown in the following steps: Figure 2

[0058] Step 201, calculating outside circulation ventilation target time t_soll according to the signal data;

[0059] Step 202, resetting outside circulation actual running time t_ist=0;

[0060] Step 211, judging whether the current vehicle running state is reverse state, if yes, automatically switching to inside circulation, and after the reverse state ends, delaying 15 seconds to enter step 212, if not, directly entering step 212;

[0061] Step 212, judging whether the user is washing glass, if yes, automatically switching to inside circulation, and after the glass washing ends, delaying 15 seconds to enter step 203, if not, directly entering step 203;

[0062] Step 203, based on the outside circulation ventilation target time t_soll calculated in step 201, performing air conditioning forced outside circulation, and ventilating and deodorizing VOC;

[0063] Step 204, during the ventilation process, accumulating and calculating outside circulation actual running time, t_ist++;

[0064] Step 205, judging whether the outside circulation actual running time t_ist is greater than the outside circulation ventilation target time t_soll, if yes, entering step 206, if not, returning to step 211; and

[0065] Step 206, ending the intelligent ventilation strategy, and entering the automatic control of comfortable air conditioning.

[0066] In one embodiment, before the control method is started, the outside circulation ventilation target time t_soll is reset and recalculated to meet the needs of users in different environments.

[0067] ​In step 201 of the above control method, the process of calculating the external circulation ventilation target time is as follows: Figure 3 Shown, including:

[0068] Step 301: The system is powered on and signal data is read from the database. The signal data read includes parking time Paking_time, outside temperature T_ambient, sunlight value Sun_int, total mileage Total_km and total vehicle usage time Total_time.

[0069] Step 302 : Calculate a base value t_base of the external circulation ventilation target time according to the acquired parking time Paking_time. Figure 4 This is a basic value table of target time for external circulation ventilation based on parking time. In the figure, t1, t2, and t3 are all calibrated values ​​and can be adjusted according to the actual situation of the vehicle.

[0070] In one embodiment, t1=10, t2=120, and t3=3.

[0071] Step 303 , calculate a first compensation value t_offset1 of the external circulation ventilation target time according to the acquired outside temperature T_ambient, and calculate a second compensation value t_offset2 of the external circulation ventilation target time according to the acquired sunlight value Sun_int, where the compensation value t_offset of the external circulation ventilation target time is t_offset=t_offset1+t_offset2. Figure 5 It is the ventilation external circulation time compensation value table based on the external temperature. Figure 6 This is a ventilation external circulation time compensation value table based on sunlight value. In the figure, T1, T2, t4, s1, s2, and t5 are all calibrated values, which can be adjusted according to the actual situation of the vehicle.

[0072] In one embodiment, T1=10, T2=30, t4=0.5, s1=100, s2=800, and t5=0.5.

[0073] Step 304 , calculate the first compensation coefficient Factor1 of the target time of external circulation ventilation based on the total mileage Total_km obtained, and calculate the second compensation coefficient Factor2 of the target time of external circulation ventilation based on the total vehicle usage time Total_time obtained. The compensation coefficient Factor of the target time of external circulation ventilation is Factor=MAX(Factor1, Factor2). Figure 7 It is the ventilation external circulation time compensation coefficient table based on the total mileage. Figure 8 This is a table of ventilation external circulation time compensation coefficients based on the total vehicle usage time. In the figure, k1, k2, f1, t6, t7, and f2 are all calibrated values ​​and can be adjusted according to the actual vehicle conditions.

[0074] In one embodiment, k1 = 15000, k2 = 60000, f1 = 0.2, t6 = 1, t7 = 4, f2 = 0.2.

[0075] Step 305, according to the results calculated in steps 302-304, further calculate the outer circulation ventilation target time t_soll, the outer circulation ventilation target time t_soll = (the base value of the outer circulation ventilation target time t_base + the compensation value of the outer circulation ventilation target time t_offset) * the compensation factor of the outer circulation ventilation target time Factor, that is, t_soll = (t_base + t_offset) * Factor. Output the calculated outer circulation ventilation target time t_soll value to the main control program for intelligent ventilation strategy adaptive control.

[0076] The present application has the following beneficial effects:

[0077] 1. The ventilation system in the present application can automatically identify and adapt to the vehicle state and external environment, and has an automatic control switching function. The ventilation system in the present application intelligently distinguishes the ventilation demand in the vehicle according to factors such as parking time, external temperature, illumination, driving mileage, etc., and accurately meets the ventilation demand of the user.

[0078] 2. The present application can effectively remove the problems of VOC and odor in the vehicle without increasing the cost of the whole vehicle, maintain the fresh air in the vehicle, and has good economic efficiency.

[0079] 3. The present application switches to the automatic air conditioning operation mode after the ventilation control is completed, and also does not affect other functions of the automatic comfort air conditioner, and has good applicability.

[0080] 4. The present application considers the influence of reversing or washing glass on the vehicle environment, avoids the entry of exhaust gas and glass washing agent into the vehicle, and maintains the fresh air in the vehicle.

[0081] 5. The present application adopts closed-loop control, and the control is more accurate.

[0082] The above embodiments are only further illustrations of the present application, and are not intended to limit the present application in other forms. The present application can have other various embodiments. It should be understood that the external circulation ventilation target time in the present application can use different fixed ventilation times, such as fixed 2-minute or 3-minute ventilation times. It should also be understood that the present application can not determine the use state of the vehicle when performing the ventilation strategy, and can not consider the influence of the reversing and / or the cleaning glass on the vehicle interior environment. It should also be understood that the factors considered in the calculation of the external circulation ventilation target time include, but are not limited to, some of the parking time, the external temperature, the sunlight value, the total mileage of the vehicle, and the total use time of the vehicle. Without departing from the spirit and essence of the present application, those skilled in the art can make various corresponding changes and modifications according to the present application, but these corresponding changes and modifications should fall within the protection scope of the claims of the present application.

Claims

1. An automobile air conditioning ventilation system, comprising: a detection device for obtaining signal data, the detection device comprising an outside temperature sensor, a sunlight sensor, a wiper signal sensor, a gearbox signal sensor, a total mileage / usage time sensor, and a parking time sensor; a vehicle body controller electrically connected to the detection device, the vehicle body controller receiving and processing converted signal data and outputting signals; an air conditioning control system comprising an air conditioning controller, a blower, and a damper control motor, the air conditioning controller being electrically connected to the vehicle body controller, the air conditioning controller being configured to receive, process, and output signals outputted by the vehicle body controller, and the blower and the damper control motor being configured to receive control signals outputted by the air conditioning controller and perform intelligent ventilation to remove VOCs in the vehicle; a control method of the automobile air conditioning ventilation system, comprising: calculating an outside circulation ventilation target time t_soll based on the signal data; resetting an outside circulation actual running time t_ist to 0; determining whether the current vehicle running state is a reverse state, if the current vehicle running state is the reverse state, automatically switching to inside circulation, and after the reverse state ends, delaying entering the next step, if the current vehicle running state is not the reverse state, directly entering the next step; determining whether the user is cleaning the glass, if the user is cleaning the glass, automatically switching to inside circulation, and after cleaning the glass, delaying entering the next step, if the user is not cleaning the glass, directly entering the next step; performing air conditioning forced outside circulation based on the calculated outside circulation ventilation target time t_soll to ventilate and remove VOCs; during the ventilation process, accumulating and calculating the outside circulation actual running time t_ist, t_ist++; determining whether the outside circulation actual running time t_ist is greater than the outside circulation ventilation target time t_soll, if the outside circulation actual running time t_ist > the outside circulation ventilation target time t_soll, ending the intelligent ventilation and entering a comfortable air conditioning automatic control, if the outside circulation actual running time t_ist ≤ the outside circulation ventilation target time t_soll, returning to the step of determining whether the current vehicle running state is the reverse state and re-determining the vehicle state.

2. The automobile air conditioning ventilation system of claim 1, wherein: the signal data obtained by the outside temperature sensor is an outside temperature; the signal data obtained by the sunlight sensor is a sunlight value; the signal data obtained by the wiper signal sensor is a wiper signal; the signal data obtained by the gearbox signal sensor is a gearbox signal; the signal data obtained by the total mileage / usage time sensor is a total mileage / usage time; the signal data obtained by the parking time sensor is a parking time.

3. A control method of an automobile air conditioning ventilation system for controlling the automobile air conditioning ventilation system according to claim 1 or 2, characterized by, comprising: step 201, calculating an outside circulation ventilation target time based on the signal data; step 202, resetting an outside circulation actual running time; step 211, determining whether the current vehicle running state is a reverse state based on the gearbox signal, if the current vehicle running state is the reverse state, delaying entering step 212, if the current vehicle running state is not the reverse state, directly entering step 212; Step 212, according to the wiper signal to determine whether the user is washing the glass, if it is a washing glass state, delay into step 203, if it is not a washing glass state directly into step 203; Step 203, based on the step 201 calculation of the outer circulation ventilation target time, air conditioning forced outer circulation is carried out to ventilate and remove VOC; Step 204, in the ventilation process, the actual running time of the outer circulation is accumulated and calculated; Step 205, it is judged whether the actual running time of the outer circulation is greater than the outer circulation ventilation target time, if the actual running time of the outer circulation > the outer circulation ventilation target time, step 206 is entered, if the actual running time of the outer circulation ≤ the outer circulation ventilation target time, step 203 is returned; And Step 206, the intelligent ventilation strategy is ended, and the automatic control of the comfortable air conditioner is entered; In the step 201, the calculation method of the outer circulation ventilation target time comprises: Step 301, the system is powered on, and signal data is read in the database, the signal data comprising: parking time, outdoor temperature, sunlight value, total mileage and total vehicle use time; Step 302, the base value t_base of the outer circulation ventilation target time is calculated according to the parking time; Step 303, the first compensation value t_offset1 of the outer circulation ventilation target time is calculated according to the obtained outdoor temperature, the second compensation value t_offset2 of the outer circulation ventilation target time is calculated according to the obtained sunlight value, and the compensation value t_offset of the outer circulation ventilation target time is t_offset1+t_offset2; Step 304, the first compensation coefficient Factor1 of the outer circulation ventilation target time is calculated according to the obtained total mileage Total_km, the second compensation coefficient Factor2 of the outer circulation ventilation target time is calculated according to the obtained total vehicle use time Total_time, and the compensation coefficient Factor of the outer circulation ventilation target time is MAX(Factor1, Factor2); And Step 305, the outer circulation ventilation target time is further calculated according to the results calculated in steps 302-304, the outer circulation ventilation target time=(the base value t_base of the outer circulation ventilation target time+the compensation value t_offset of the outer circulation ventilation target time)×the compensation coefficient Factor of the outer circulation ventilation target time, and the outer circulation ventilation target time value is output to the main control program for control of the automobile air conditioning ventilation system.

4. The control method of the automobile air conditioning ventilation system according to claim 3, characterized by, In the step 211, if it is a reversing state, the inner circulation is automatically switched, and after the reversing is finished, a certain time delay is entered into step 212.

5. The control method of the automobile air conditioning ventilation system according to claim 3, characterized by, In the step 212, if it is a washing glass state, the inner circulation is automatically switched, and after the washing glass is finished, a certain time delay is entered into step 203.

6. The control method of the automobile air conditioning ventilation system according to any one of claims 4 or 5, wherein the delay time is set to 15 seconds.

7. The control method of the automobile air conditioning ventilation system according to claim 3, characterized by, Before the control method is started, the outer circulation ventilation target time is reset and recalculated to meet the needs of the user in different environments.

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