Energy-saving control system and method for pure electric vehicle based on inner and outer circulation air door and medium

Abstract

The application discloses an energy-saving control system and method for a pure electric vehicle based on an internal and external circulation air door and a medium. When the vehicle runs in an internal circulation mode, the ambient temperature, the glass temperature, the humidity in the vehicle and the internal circulation opening ratio gear of the air door are collected; the dew point temperature is calculated; the temperature difference AT between the glass temperature and the dew point temperature is calculated; when the temperature difference AT exceeds a first set temperature, the current internal circulation opening ratio gear of the air door is maintained; and when the temperature difference AT is less than the first set temperature, the internal circulation opening ratio of the air door is adjusted, and the internal circulation opening ratio gear of the air door is reduced. In the case that the ambient temperature is low, the application can ensure the improvement of the temperature rising rate of the passenger cabin, the improvement of the thermal comfort of the user, the realization of the optimal control of the internal and external circulation air distribution ratio of the air conditioner, the reduction of the cold load of the passenger cabin, the reduction of the heating power consumption and the increase of the winter driving range of the vehicle. The pre-control of the vehicle interior fogging is realized.

Description

Technical Field

[0001] This invention pertains to pure electric vehicle control technology, specifically relating to a control technology for a pure electric vehicle during internal and external air circulation operation, particularly a control technology for preventing fogging and defogging during this operation. Background Technology

[0002] Since electric vehicles lack the engine's ability to generate hot water for passenger compartment heating, they typically employ PTC water heaters or heat pump systems. However, both methods consume the vehicle's electricity, impacting its driving range. Pure electric vehicles often experience a range reduction of over 35% in winter, making it crucial to reduce their power consumption during this period.

[0003] The air circulation inside a vehicle typically uses a full external circulation mode, a full internal circulation mode, or a partial internal circulation mode. Using full external circulation results in the highest cooling load on the passenger compartment, consuming the most electricity to achieve the same passenger compartment temperature; the heating rate is slow, leading to poor thermal comfort in the passenger compartment. While full internal circulation can reduce electricity consumption, it easily causes fogging of the interior windows, affecting driving safety.

[0004] Existing patent application CN113370746A discloses a closed-loop control system and method for defogging in a heat pump system of a pure electric vehicle. This document employs different defogging control strategies after determining that the vehicle has fogged up (i.e., the dew point temperature is higher than the glass temperature), with the low-energy control strategy being a semi-internal circulation mode. While this achieves low energy consumption, the technical approach is based on defogging control after the window glass has fogged up, failing to fully utilize the low-energy consumption effect of internal circulation. When the above technology is applied, if the vehicle is in internal circulation mode, after determining that the window is fogged up, defogging can only be performed according to the semi-internal circulation strategy. This technology cannot be used to prevent or avoid window fogging. Currently, there is no control method based on preventing or avoiding window fogging, especially under the premise of energy conservation. Summary of the Invention

[0005] The purpose of this invention is to provide a technical solution for preventing car windows from fogging, including a pure electric vehicle energy-saving control system, method, and medium for preventing car windows from fogging based on internal and external circulation dampers.

[0006] One of the technical solutions to achieve the objective of this invention is: a pure electric vehicle energy-saving control system based on internal and external circulation dampers, used in the vehicle's internal circulation mode, comprising:

[0007] The data module contains multiple calibration data for the internal circulation opening ratio of the cyclic control damper. These multiple calibration data are critical values ​​for the internal circulation opening ratio of the cyclic control damper to prevent window fogging, or the positions of the dampers corresponding to these critical values.

[0008] The data acquisition module is used to collect data on vehicle ambient temperature, glass temperature, interior humidity, and the opening ratio or position of the air vents in the cyclic control system.

[0009] The calculation and comparison module calculates the dew point temperature, compares the glass temperature with the dew point temperature, and determines whether there is a risk of fogging.

[0010] The control module is used to determine the damper's internal circulation opening ratio based on the calculation and comparison module's judgment results during internal circulation, and to control the damper to be configured to reduce the risk of fogging by adjusting the damper's internal circulation opening ratio determined by the table.

[0011] In the data module of this invention, the internal circulation opening ratio of the circulatory control damper (the ratio of the internal and external circulation opening ratio of the damper) is a mixed ratio of internal and external air intake, such as, but not limited to, internal air intake volume: external air intake volume or internal air intake opening ratio of the damper: external air intake opening ratio. That is, when the car window fogs up, the position of the damper under internal circulation, i.e., the corresponding internal and external circulation opening ratio of the damper, is called the critical value, also known as the critical value of the internal circulation opening ratio of the circulatory control damper to prevent car window fogging; the positions of the damper corresponding to the above multiple critical values ​​are called the damper position (or internal circulation damper position, or internal circulation opening ratio position of the damper).

[0012] A further optimized technical solution is as follows: the calibrated critical value or the position of the damper corresponding to the critical value is the position of the damper corresponding to the critical value of the internal circulation opening ratio when the windows fog up under different vehicle ambient temperature, in-vehicle humidity, and glass temperature.

[0013] When calibrating, the glass temperature can be directly detected by the in-vehicle temperature sensor; of course, the air conditioning set temperature and air conditioning fan speed can also be considered during calibration.

[0014] The system of this invention sets multiple internal circulation damper openings with different proportions under the vehicle's internal circulation operating condition, making full use of the energy-saving characteristics of internal circulation to achieve refined control; under refined control, the energy consumption of pure electric vehicles is reduced, which helps to improve the vehicle's cruising range.

[0015] The second technical solution to achieve the objective of this invention is: a pure electric vehicle energy-saving control method based on internal and external circulation dampers, which includes:

[0016] S1. When the vehicle is running in internal circulation mode, collect ambient temperature, glass temperature, vehicle humidity, and the internal circulation opening ratio of the vent.

[0017] S2. Calculate the dew point temperature;

[0018] S3. Calculate the temperature difference ΔT between the glass temperature and the dew point temperature;

[0019] S4. If the temperature difference ΔT exceeds the first set temperature, maintain the current damper internal circulation opening ratio; if the temperature difference ΔT is less than the first set temperature, execute S5.

[0020] S5. Adjust the internal circulation opening ratio of the damper and reduce the internal circulation opening ratio of the damper to a lower setting.

[0021] The damper internal circulation opening ratio settings include damper positions with critical values ​​for multiple damper internal circulation opening ratios that prevent the windows from fogging under different vehicle ambient temperatures, in-vehicle humidity, and glass temperatures.

[0022] The aforementioned glass temperature includes, but is not limited to, the windshield; glass temperature T w - Dew point temperature T d = Temperature difference ΔT.

[0023] Typically when the dew point temperature T d ≥ Glass temperature T w At this time, fog will form on the car windows. In this invention, the first set temperature t1 is set to, but is not limited to, t1≥0.5℃.

[0024] The ambient temperature is the temperature outside the car.

[0025] The mixing ratio of internal and external air intake specified above (or referred to as internal air intake volume: external air intake volume or internal air intake opening of the damper: external air intake opening) increases with the increase of ambient temperature. That is, the higher the ambient temperature (the higher the outside temperature), the greater the internal air volume, until it is completely internal air intake, which is the maximum setting; the lower the ambient temperature (the lower the outside temperature), the smaller the internal air volume, until it is completely external air intake, which is the minimum setting.

[0026] The above method of reducing the internal circulation opening ratio of the damper refers to reducing the air intake of the internal circulation and increasing the air intake of the external circulation under the current internal circulation opening ratio of the damper.

[0027] The method of this invention increases the intake air volume of the external circulation and reduces the intake air volume of the internal circulation, thereby reducing the humidity inside the vehicle and lowering the dew point temperature inside the vehicle to avoid the risk of fogging, especially when the ambient temperature is low, such as in winter.

[0028] This method maximizes the energy-saving features of internal circulation while avoiding fogging. The control method and algorithm are simple.

[0029] The further optimized technical solution is to reduce the operating speed of the damper's internal circulation opening ratio, including operating at a lower speed.

[0030] A further optimized technical solution includes: after operating at a reduced damper internal circulation opening ratio, repeating S1-S4, and when the temperature difference ΔT is less than the first set temperature, operating at a further reduced damper internal circulation opening ratio.

[0031] The above-mentioned step-by-step downshifting control, with its refined control of the internal circulation damper, maximizes the energy-saving characteristics of internal circulation.

[0032] The further optimized technical solution includes: after reducing the damper internal circulation opening ratio, repeating S1-S3, where the temperature difference ΔT exceeds the first set temperature, maintaining the current damper internal circulation opening ratio for a second set time, and then increasing the damper internal circulation opening ratio.

[0033] The above control strategy reduces the humidity inside the vehicle after running for a second set time. This reduces the risk of fogging and increases the air intake of the internal circulation system, which helps reduce energy consumption.

[0034] A further optimized technical solution includes: after operating at a reduced damper internal circulation opening ratio, repeating S1-S3, and when the temperature difference ΔT is less than the first set temperature, adjusting the damper internal circulation opening ratio to the lowest setting.

[0035] This is the full external circulation operating condition.

[0036] The further optimized technical solution is as follows: after adjusting the damper internal circulation opening ratio to the lowest setting, repeat S1-S3. When the temperature difference ΔT exceeds the first set temperature, maintain the current damper internal circulation opening ratio for the first set time, and then increase the damper internal circulation opening ratio.

[0037] The further optimized technical solution is as follows: after adjusting the damper internal circulation opening ratio to the lowest setting, repeat S1-S3. When the temperature difference ΔT is less than the first set temperature, after reaching the third set time, enter the defogging mode.

[0038] The defogging mode can be operated using, but is not limited to, existing defogging control methods based on air conditioning control in various vehicles.

[0039] This invention provides a method that, under low ambient temperatures, such as in winter, optimizes the ratio of internal and external air circulation in the air conditioning system while ensuring driving safety (no interior fogging). This reduces the cooling load on the passenger compartment, lowers heating power consumption, and increases the vehicle's winter driving range, all while maintaining a faster rate of temperature increase for the passenger compartment and improved thermal comfort for users. It also achieves proactive control of interior fogging, preventing and avoiding fogging altogether.

[0040] The third technical solution for achieving the objective of this invention is: a medium containing execution instructions, which, when processed by a data processing device, executes the aforementioned energy-saving control method for pure electric vehicles based on internal and external circulation dampers. This medium can be a vehicle's air conditioning controller, body controller, or a data processing device such as an MCU. Attached Figure Description

[0041] Figure 1 Flowchart of the method of this invention. Detailed Implementation

[0042] The following detailed embodiments are provided to explain the technical solutions of the claims of this invention, so that those skilled in the art can understand the claims. The scope of protection of this invention is not limited to the following specific embodiments. Any modifications made by those skilled in the art that incorporate the technical solutions of the claims but differ from the following detailed embodiments are also within the scope of protection of this invention.

[0043] In the embodiments, the control drive actuator for rotating the internal and external circulation control damper in the air duct of the air conditioning or heat pump system of a pure electric vehicle may be, but is not limited to, a stepper motor. A position sensor, such as, but not limited to, an angle sensor, is installed at the damper to check the position of the damper (or the damper's position).

[0044] Humidity and temperature sensors are installed inside the vehicle, and these sensors can be placed not only near the windshield, but especially near the driver's side.

[0045] Using humidity and temperature sensors, the dew point temperature inside the vehicle can be calculated, especially the dew point temperature near the windshield.

[0046] The output signals from the humidity sensor and temperature sensor are sent to, but are not limited to, the air conditioning controller or the body controller. The air conditioning controller or the body controller calculates, compares, and judges the data, and outputs control commands (pulse width modulation signals) to drive the internal and external circulation control damper and the actuator to rotate the damper to the specified position (gear).

[0047] The internal circulation opening ratio of the circulating control damper is calibrated. Under different ambient temperature, vehicle interior temperature and humidity conditions, the internal circulation opening ratio when the circulating control damper fogs up is calibrated to obtain multiple calibration data. The multiple calibration data are multiple critical values ​​of the internal circulation opening ratio of the circulating control damper to prevent vehicle windows from fogging up, or the positions of the damper corresponding to multiple critical values.

[0048] In this embodiment, the ambient temperature can be calibrated using, but is not limited to, temperature ranges to reduce the workload of calibration, such as ≤-20℃, -20~-15℃, -15~-10℃, -10~-5℃…10~15℃, 15~20℃, ≥20℃. The vehicle interior temperature can be measured in 1℃ intervals, and the humidity in 1% intervals. The calibrated critical values ​​for the internal circulation opening ratio of the multiple anti-fogging control dampers, or the positions of the dampers corresponding to these critical values, or the damper internal circulation opening levels, reflect the relationship that the mixing ratio of internal and external airflow increases with increasing ambient temperature. That is, the higher the ambient temperature, the greater the internal circulation airflow, and thus the higher the damper internal circulation opening level, until it is completely internal circulation at the maximum level; conversely, the lower the ambient temperature, the smaller the internal circulation airflow, and thus the lower the damper internal circulation opening level, until it is completely external circulation at the minimum level.

[0049] The calibration data is stored in the air conditioning controller or the body controller.

[0050] The execution control is as follows:

[0051] like Figure 1 As shown, when the vehicle is operating in internal circulation mode, the current internal circulation opening ratio of the damper can be adjusted and determined by the driver.

[0052] S1. When the vehicle is running in the internal circulation mode, the outside temperature sensor collects the ambient temperature Tout (outside temperature), the inside temperature sensor collects the glass temperature Tw, the inside humidity sensor collects the inside humidity RH, and the damper position sensor (angle sensor or angle encoder) collects the damper internal circulation opening ratio information S.

[0053] S2. The vehicle body controller (or MCU) acquires the above-mentioned data and calculates the current dew point temperature T. d ;

[0054] S3. Calculate the temperature difference ΔT between glass temperature and dew point temperature: glass temperature Tw - dew point temperature Td;

[0055] S4. When the temperature difference ΔT exceeds the first set temperature t1, that is, ΔT≥t1; in the embodiment, t1=2℃, the current damper internal circulation opening ratio is maintained.

[0056] When the temperature difference ΔT < t1, execute S5;

[0057] S5. The body controller (or MCU) outputs a control command to the damper motor controller to reduce the damper's internal circulation opening ratio by one gear, i.e., gear S-1. The damper motor rotates the damper to gear S-1.

[0058] S51. After the damper is in position S-1, repeat S1-S4. When the temperature difference ΔT exceeds the first set temperature t1, that is, ΔT≥t1, maintain the operation of the front damper internal circulation opening ratio position S-1.

[0059] S52. After the damper is in position S-1, repeat S1-S4. When the temperature difference ΔT < t1, the body controller (or MCU) outputs a control command to the damper motor controller, and then reduces the damper internal circulation opening ratio by one gear, i.e., gear S-2. The damper motor rotates the damper to gear S-2.

[0060] S52-10, with the damper in position S-2, repeat S1-S4. When the temperature difference ΔT exceeds the first set temperature t1, i.e. ΔT≥t1, maintain the front damper internal circulation opening ratio position S-2.

[0061] S52-11. After maintaining the front damper internal circulation opening ratio at position S-2 for the second set time, such as 5 minutes, and after continuous sampling and comparison still showing ΔT ≥ t1, the body controller (or MCU) outputs a control command to the damper motor controller to increase the damper internal circulation opening ratio to S, and the damper motor rotates the damper to position S. Repeat S1-S4. When the temperature difference ΔT exceeds the first set temperature t1, i.e., ΔT ≥ t1, maintain the front damper internal circulation opening ratio at position S.

[0062] S52-20, with the damper in position S-2, repeat S1-S4. When the temperature difference ΔT < t1, the vehicle controller (or MCU) outputs a control command to the damper motor controller, adjusting the damper's internal circulation opening ratio to the lowest setting. The damper motor then rotates the damper to position S. min This means the damper is in the full external circulation position (gear).

[0063] S52-20-1 After the damper internal circulation opening ratio gear is set to the lowest gear, repeat S1-S4. After running for the first set time, such as 3 minutes of continuous sampling and comparison, ΔT≥t1 is still true. The body controller (or MCU) outputs a control command to the damper motor controller to increase the damper internal circulation opening ratio gear to S. The damper motor rotates the damper to gear S.

[0064] S52-21 After the damper internal circulation opening ratio is set to the lowest setting, repeat S1-S4. When the temperature difference ΔT < t1, after the third set time is reached, if continuous sampling and comparison are performed for 3 minutes and the temperature difference ΔT < t1, enter the defogging mode.

[0065] Defogging mode operation can employ, but is not limited to, existing vehicle defogging control methods based on air conditioning control.

[0066] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0067] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0068] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0069] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An energy-saving control system for pure electric vehicles based on internal and external circulation dampers, characterized in that: Used in vehicles operating under internal air circulation conditions, including: The data module contains multiple calibration data for the internal circulation opening ratio of the cyclic control damper. These multiple calibration data are critical values ​​for the internal circulation opening ratio of the cyclic control damper to prevent window fogging, or the positions of the dampers corresponding to these critical values. The data acquisition module is used to collect data on vehicle ambient temperature, glass temperature, interior humidity, and the opening ratio or position of the air vents in the cyclic control system. The calculation and comparison module calculates the dew point temperature, compares the glass temperature and the dew point temperature, and determines whether there is a risk of fogging; this includes calculating the temperature difference between the glass temperature and the dew point temperature. Compare the temperature differences. and the first set temperature; The control module, under internal circulation, determines the damper's internal circulation opening ratio based on the calculation and comparison module's judgment result, and controls the damper to be configured to the table-determined damper internal circulation opening ratio to reduce the risk of fogging; the temperature difference If the temperature is lower than the first set temperature, reduce the damper's internal circulation opening by one level; after reducing the damper's internal circulation opening, when the temperature difference... If the temperature is lower than the first set temperature, reduce the internal circulation opening of the damper by one level. When the damper's internal circulation opening ratio is set to the lowest setting, and the temperature difference... When the third set time is reached, it will enter the defogging mode.

2. The energy-saving control system for pure electric vehicles based on internal and external circulation dampers as described in claim 1, characterized in that: The calibrated critical value or the position of the damper corresponding to the critical value is the critical value or the position of the damper corresponding to the internal circulation opening ratio that prevents the windows from fogging under different vehicle ambient temperature, in-vehicle humidity, and glass temperature.

3. An energy-saving control method for pure electric vehicles based on internal and external circulation dampers, characterized by: include: S1. When the vehicle is running in internal circulation mode, collect ambient temperature, glass temperature, vehicle humidity, and the internal circulation opening ratio of the vent. S2. Calculate the dew point temperature; S3. Calculate the temperature difference between the glass temperature and the dew point temperature. ; S4, the temperature difference If the temperature exceeds the first set temperature, maintain the current damper internal circulation opening ratio; the temperature difference If the temperature is lower than the first set temperature, execute. ; S5. Adjust the internal circulation opening ratio of the damper and reduce the internal circulation opening ratio of the damper to a lower setting. Reducing the damper's internal circulation opening ratio includes lowering it by one level. Running; damper in gear Then, repeat When the temperature difference Then, downshift one gear. The damper operates at the specified internal circulation opening ratio. After adjusting the damper's internal circulation opening ratio to the lowest setting, repeat the process. The temperature difference When the temperature is below the first set temperature and the third set time is reached, the system will enter defogging mode. The damper internal circulation opening ratio settings include the positions of the damper corresponding to multiple critical values ​​of the internal circulation opening ratio of the calibrated anti-fogging control damper under different vehicle ambient temperatures, in-vehicle humidity, and glass temperatures.

4. The energy-saving control method for pure electric vehicles based on internal and external circulation dampers as described in claim 3, characterized in that: It also includes, After reducing the damper's internal circulation opening ratio, repeat... The temperature difference Once the first set temperature is exceeded, the current damper internal circulation opening ratio is maintained at the second set time, and then the damper internal circulation opening ratio is increased.

5. The energy-saving control method for pure electric vehicles based on internal and external circulation dampers as described in claim 3, characterized in that: It also includes, After operating at a reduced damper internal circulation ratio setting, repeat... When the temperature difference If the temperature is lower than the first set temperature, adjust the damper's internal circulation opening ratio to the lowest setting.

6. The energy-saving control method for pure electric vehicles based on internal and external circulation dampers as described in claim 5, characterized in that: After adjusting the damper's internal circulation opening ratio to the lowest setting, repeat the process. The temperature difference Once the temperature exceeds the first set temperature, maintain the current damper internal circulation opening ratio for the first set time, then increase the damper internal circulation opening ratio.

7. A medium, characterized in that, It includes execution instructions, which, when processed by a data processing device, execute the energy-saving control method for pure electric vehicles based on internal and external circulation dampers as described in any one of claims 3-6.

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