WO2019219006A1 - Voltage detection control method for parking air conditioner and parking air conditioner - Google Patents

Abstract

A voltage detection control method for a parking air conditioner, comprising the following steps: a parking air conditioner is powered on; determine whether a power supply voltage meets an operation condition; if the power supply voltage meets the operation condition, sample an in-vehicle ambient temperature; determine whether the in-vehicle ambient temperature meets a starting condition; if the in-vehicle ambient temperature meets the starting condition, output a starting control signal to an outdoor drive module (20); a compressor (30) is started; determine a temperature gear interval to which the in-vehicle ambient temperature belongs, and output a corresponding gear control signal; the compressor (30) works according to the frequency corresponding to the gear control signal; determine whether a shutdown condition is met and whether the power supply voltage meets a protection condition; if the shutdown condition is met and the power supply voltage meets the protection condition, output a shutdown control signal to the outdoor drive module (20); the outdoor drive module (20) drives the compressor (30) to shut down. Also provided is a parking air conditioner using the voltage detection control method thereof. According to the voltage detection control method for the parking air conditioner, and the parking air conditioner, the endurance ability of the parking air conditioner is improved; the parking air conditioner is well protected; the probability of communication failure is decreased; the practicability of the parking air conditioner is improved.

Description

Parking air conditioner voltage detection control method and parking air conditioner Technical field

The invention relates to the technical field of air conditioning equipment, in particular to a parking air conditioner voltage detection control method and a parking air conditioner.

Background technique

Parking air conditioners are air conditioners used for parking and rest. They are usually installed on trucks and vans, and drivers can use them during long-distance driving. The traditional parking air conditioner includes the following forms: the first is to drive the compressor through the diesel generator, and further to drive the refrigerant in the sealed refrigeration system through the compressor, the diesel generator uses water as the cooling medium; The same is still driven by a diesel generator to drive the compressor, but using flowing air as the cooling medium; the third is to drive the compressor through the gasoline generator; the fourth is to drive the compressor through the DC power supply.

It is not difficult to see that in the first three modes, fuel is required as a power source. Therefore, the running parking air conditioner will significantly increase the fuel consumption of the vehicle. Moreover, whether water is used as a cooling medium or air as a cooling medium, the service life of the generator itself is difficult to meet the actual use requirements, and the maintenance cost is high. If it is not maintained, it will cause irreversible damage to the generator. The use of DC power as a power source can effectively solve the above problems. The Chinese patent application "A car and its parking air conditioning system" (authorization bulletin number CN206374503U) discloses a parking air conditioning system for a car, a parking air conditioning system. "Includes an air conditioning device that is disposed on a vehicle body and that is driven by an energy source independent of the engine and that is used to temperature regulate the interior environment of the vehicle." The above patent application further discloses the following technical content, see paragraph [0031] of the specification. "The temperature detection module has also been added to detect the ambient temperature in the vehicle, so that the combined temperature of the set operation and the temperature inside the vehicle are comprehensively judged, and the output power adjustment value of the air conditioner is corrected."

In the technical solution disclosed in the above patent, since it is necessary to comprehensively judge the required temperature of the installation operation and the temperature inside the vehicle, the output power of the air conditioner, especially the compressor output power adjustment value, is corrected, that is, it is required Repeated correction of a variable, so in the outdoor unit, a control module for controlling the output power of the compressor needs to be provided, and a drive module for driving the compressor, the fan and other refrigeration components, an indoor control module and The outdoor control module uses a feedback control method for two-way communication. On the one hand, the control cost of the equipment is increased. On the other hand, due to the unstable operating environment of the parking air conditioner, the control module may need to work in a humid environment for a long time, and the possibility of communication failure is very high. In the event of a communication failure, a complicated process is required in the prior art to determine the point of failure and perform maintenance, and the actual use is not effective.

Summary of the invention

The invention discloses a control method for a parking air conditioner, which aims to improve the endurance capability and practicability of the parking air conditioner.

A parking air conditioner voltage detection and control method includes the following steps:

The parking air conditioner is powered on, and the indoor control module samples the power supply voltage and determines whether the power supply voltage meets the operating condition; wherein the operating condition is: the power supply voltage is greater than the low voltage protection set value and less than the high voltage cutoff setting value;

If the operating condition is met, the indoor control module samples the ambient temperature of the vehicle;

The indoor control module determines whether the ambient temperature of the vehicle meets the starting condition; if the starting condition is met, the indoor control module outputs a starting control signal to the outdoor driving module through the first signal path, and the outdoor driving module drives the compressor to start;

The indoor control module determines a temperature gear interval to which the ambient temperature of the vehicle belongs, and outputs a corresponding gear position control signal to the outdoor drive module through the second signal path, and the outdoor drive module drives the compressor according to the gear position control signal. Frequency work;

The indoor control module determines whether the ambient temperature of the vehicle meets the shutdown condition, and determines whether the power supply voltage meets a protection condition; wherein the protection condition is: the power supply voltage is greater than a high voltage cutoff set value or less than a low voltage protection set value; If the ambient temperature of the vehicle meets the shutdown condition or the power supply voltage meets the protection condition, the indoor control module outputs a shutdown control signal to the outdoor drive module through the first signal path, and the outdoor drive module drives the compressor to stop.

Further, the method further includes the following steps:

The indoor control module samples a set temperature and invokes at least one reference temperature;

The indoor control module calculates a sum of a set temperature and the reference temperature;

The indoor control module sets the sum value as a lower limit threshold of a higher temperature range of the two consecutive temperature range sections, and sets the sum value as a lower temperature range of the two consecutive temperature range sections The upper threshold of the bit interval.

Further, the indoor control module samples the set temperature and invokes a first reference temperature;

The indoor control module calculates a sum of the set temperature and the first reference temperature;

The indoor control module sets the sum value as a lower limit threshold of the first temperature range, and is an upper threshold of the second temperature range;

When the indoor environment temperature belongs to the first temperature range, the indoor control module outputs a first level signal to the outdoor driving module through the second signal path, and the outdoor driving module drives the compressor according to the first Frequency operation; when the ambient temperature of the vehicle belongs to the second temperature range, the indoor control module outputs a second level signal to the outdoor driving module through the second signal path, and the outdoor driving module drives the compressor according to the Two frequency operation; wherein the first frequency is higher than the second frequency.

Further, the following steps are also included:

The indoor control module samples a set temperature and invokes a second reference temperature;

The indoor control module calculates a difference between the set temperature and the second reference temperature;

The indoor control module sets the difference to be a lower threshold of the second temperature range.

Further, the following steps are also included:

The indoor control module samples the set temperature and invokes a third reference temperature;

The indoor control module calculates a difference between the set temperature and the third reference temperature;

The indoor control module sets a difference between the set temperature and the third reference temperature as a lower limit threshold of the start condition, and sets a difference between the set temperature and the third reference temperature as the stop condition Upper threshold

The third reference temperature is less than or equal to the second reference temperature.

Further, if the in-vehicle ambient temperature satisfies the starting condition, the first timer in the indoor control module is started, and when the timing parameter of the first timer reaches the first duration, the indoor The control module outputs a start control signal to the outdoor drive module through the first signal path.

Further, if the power voltage is greater than the high voltage cutoff setting, the second timer in the indoor control module is started, and when the timing parameter of the second timer reaches the second time, the indoor control module is The second duration is a continuous output of a plurality of high voltage alarm signals and generates a shutdown signal.

Further, if the power supply voltage is lower than the low voltage protection setting value, the indoor control module determines whether the power supply voltage is greater than a low voltage cutoff setting value; if the power supply voltage is greater than a low voltage cutoff setting value, the third timing in the indoor control module When the timing parameter of the third timer reaches the third time, the indoor control module outputs a shutdown control signal to the outdoor driving module through the first signal path, and the outdoor driving module drives the compressor to stop; the indoor control module determines the power supply voltage Whether it is greater than the recovery set voltage, when the power supply voltage is greater than the recovery set voltage and the timing parameter of the third timer is greater than the protection duration, if the interior temperature of the vehicle meets the startup condition again, the indoor control module passes the A signal path outputs a start control signal to the outdoor drive module, and the outdoor drive module drives the compressor to start again.

Further, when the timing parameter of the third timer reaches the third duration and the power supply voltage is lower than the low voltage cutoff setting value, the indoor control module generates a shutdown signal; if the indoor control module receives the power on signal again, first determines Whether the power supply voltage is greater than the low voltage cutoff setting value, and if greater than the low voltage cutoff set value, determining whether the power supply voltage is greater than the recovery voltage, when the power supply voltage is greater than a recovery set voltage and the first When the timing parameter of the three timers is greater than the protection duration, if the indoor ambient temperature meets the startup condition again, the indoor control module outputs a start control signal to the outdoor drive module through the first signal path, and the outdoor drive module drives the compressor to start again; When the power supply voltage is less than the low voltage cutoff setting value, the indoor control module generates a shutdown signal again.

According to the parking air conditioner voltage detection and control method disclosed by the invention, the compressor of the parking air conditioner can work in different gear positions according to different working conditions, so that the parking air conditioner has the purpose of fast response speed, energy saving and environmental protection, and improves the DC power source. Endurance capability. At the same time, the control module is no longer set in the outdoor unit, and the indoor control module and the outdoor drive module are unidirectionally communicated, which greatly reduces the probability of communication failure, making the maintenance cycle and service life of the parking air conditioner longer and practical. Better sex.

At the same time, a parking air conditioner is also disclosed, which adopts a parking air conditioner voltage detection control method, and the parking air conditioner voltage detection control method comprises the following steps:

The parking air conditioner is powered on, and the indoor control module samples the power supply voltage and determines whether the power supply voltage meets the operating condition; wherein the operating condition is: the power supply voltage is greater than the low voltage protection set value and less than the high voltage cutoff setting value;

If the operating condition is met, the indoor control module samples the ambient temperature of the vehicle;

The indoor control module determines whether the ambient temperature of the vehicle meets the starting condition; if the starting condition is met, the indoor control module outputs a starting control signal to the outdoor driving module through the first signal path, and the outdoor driving module drives the compressor to start;

The indoor control module determines a temperature gear interval to which the ambient temperature of the vehicle belongs, and outputs a corresponding gear position control signal to the outdoor drive module through the second signal path, and the outdoor drive module drives the compressor according to the gear position control signal. Frequency work;

The indoor control module determines whether the ambient temperature of the vehicle meets the shutdown condition, and determines whether the power supply voltage meets a protection condition; wherein the protection condition is: the power supply voltage is greater than a high voltage cutoff setting value or less than a low voltage protection setting value; If the ambient temperature of the vehicle meets the shutdown condition or the power supply voltage meets the protection condition, the indoor control module outputs a shutdown control signal to the outdoor drive module through the first signal path, and the outdoor drive module drives the compressor to stop.

The parking air conditioner disclosed by the invention has the advantage of being practical.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a flow chart of a first specific embodiment of a parking air conditioner voltage detection control method according to the present invention;

2 is a flow chart showing the steps of generating a temperature gear range in the parking air conditioner voltage detection control method disclosed in FIG. 1;

3 is a flow chart showing the steps of an alarm protection in the parking air conditioner voltage detection control method disclosed in FIG. 1;

4 is a flow chart showing the steps of the first type of compressor protection in the parking air conditioner voltage detection control method disclosed in FIG. 1;

5 is a flow chart showing the steps of the second compressor protection in the parking air conditioner voltage detection control method disclosed in FIG. 1;

Figure 6 is a schematic block diagram showing the structure of the parking air conditioner disclosed in the present invention;

7 is a schematic block diagram showing the structure of an indoor control module of a parking air conditioner according to the present invention;

8 is a flow chart of another specific embodiment of a parking air conditioner voltage detection control method according to the present invention;

FIG. 9 is a flow chart of still another specific embodiment of a parking air conditioner voltage detection control method according to the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flow chart showing a specific embodiment of a parking air conditioner voltage detection control method according to the present invention. The parking air conditioner is powered by a 24V DC power supply, that is, the battery is powered. The parking air conditioner receives the power-on command generated by the remote controller, the mobile terminal or the human-machine interface, and is powered on in a standby state. As shown in FIG. 1 , the parking air conditioner voltage detection control method disclosed in the present invention specifically includes the following steps:

In step S100, the parking air conditioner is powered on, and the indoor control module samples the power supply voltage, and further determines whether the power supply voltage meets the operating condition. The operating condition is that the power supply voltage is greater than the low voltage protection set value and less than the high voltage cutoff set value. The low-voltage protection setpoint and the high-pressure cut-off setpoint are obtained by a large number of experiments by professionals. For different types of air conditioners, the low-pressure protection setpoint and the high-pressure cut-off setpoint are different. The low voltage protection setpoint and the high pressure cutoff setpoint are stored as fixed values and are recalled by the indoor control module at any time. When the operating conditions are met, the parking air conditioner can operate normally under the control method disclosed in this embodiment. Preferably, when the power supply voltage meets the operating condition and lasts for 5 seconds, the indoor control module determines that the operating condition is satisfied, and avoids erroneous determination caused by voltage fluctuation.

In step S101, when the operating condition is met, the indoor control module samples the ambient temperature of the vehicle. The temperature sensor for detecting the ambient temperature of the vehicle is preferably disposed on the return air port of the parking air conditioner indoor unit. The indoor control module determines whether the compressor of the parking air conditioner satisfies the starting condition based on the sampled ambient temperature of the vehicle. The starting conditions can be set according to the model of the parking air conditioner and the specific working conditions after the vehicle is installed. The indoor control module is an MCU.

Step S102, if the sampled in-vehicle ambient temperature meets the start condition, the indoor control module outputs a start control signal to the outdoor drive module through the first signal path. The outdoor drive module drives the compressor to start after receiving the start control signal. The external driving module may be an IPM (Intelligent Power Module), that is, an intelligent power control module and its peripheral circuits, and may be a similar driving circuit or a driving chip, which is not limited herein.

Step S103, after the outdoor driving module drives the compressor to start, the indoor control module further determines a temperature gear interval to which the ambient temperature of the vehicle belongs. The temperature range can be set according to the model of the parking air conditioner and the specific working conditions after the vehicle is installed. Each temperature gear position corresponds to an independent gear position control signal. When the outdoor drive module receives the gear position control signal from the indoor control module, the automatic drive compressor automatically operates according to the frequency corresponding to the gear position control signal.

Step S104, after determining the temperature gear interval to which the vehicle interior temperature belongs, the indoor control module outputs a corresponding gear position control signal to the outdoor drive module through the second signal path; the outdoor drive module drives the compressor according to the gear position control signal. The frequency works and remains constant at the corresponding frequency.

In step S1051, during the operation, the indoor control module continues to determine whether the ambient temperature in the vehicle meets the shutdown condition. Similarly, the shutdown condition can also be set according to the model of the parking air conditioner and the specific working conditions after the vehicle is installed.

In step S1052, during the operation, the indoor control module determines on the other hand whether the power supply voltage meets the protection condition. The protection condition is that the power supply voltage is greater than a high voltage cutoff set value or less than a low voltage protection set value. When the power supply voltage is greater than the high voltage cutoff setting value, the motor or the device on the circuit in the parking air conditioner may not work normally, further causing irreversible damage. When the power supply voltage is lower than the low voltage protection value, the normal operation of the parking air conditioner will be affected.

Step S106, if the indoor environment temperature meets the shutdown condition or the power supply voltage satisfies the protection condition, the indoor control module outputs a shutdown control signal to the outdoor drive module through the first signal path.

Step S107, the outdoor driving module controls the compressor to stop after receiving the shutdown control signal.

According to the parking air conditioner voltage detection and control method disclosed by the invention, the parking air conditioner works under a perfect protection mechanism, and the compressor can work in different gear positions according to different working conditions, so that the parking air conditioner has a fast response speed and energy saving and environmental protection. The purpose is to improve the endurance of the DC power supply. At the same time, the control module is no longer set in the outdoor unit, and the indoor control module and the outdoor drive module communicate in one direction, which greatly reduces the probability of communication failure and makes the maintenance cycle of the parking air conditioner. Longer service life and better usability.

In order to adapt to different working conditions and the actual needs of users, optimize the start and stop and working gear position of the parking air conditioner compressor. The following describes the preferred method of setting the temperature gear range for the above control method.

Specifically, at least one reference temperature is stored in the parking air conditioner. The reference temperature can be an empirical value, but preferably, the reference temperature can be based on big data calculations based on different vehicle models, different geographic parameters, and usage environment. The indoor control module can call the reference temperature at any time.

The user inputs the set temperature to the indoor control module through the remote controller, the mobile terminal, and the human-machine interaction interface according to actual needs. The indoor control module sets a plurality of consecutive temperature gear intervals according to the set temperature, and each temperature gear interval corresponds to a corresponding gear control signal. The compressor operating frequency and the temperature range corresponding to the plurality of gear control signals are in a monotonic relationship. That is to say, when the threshold of the temperature range is higher, the compressor operating frequency is higher.

The indoor control module calculates the sum of the set temperature and the reference temperature. The indoor control module further sets the sum value to a lower limit threshold of a higher temperature range of the two consecutive temperature range sections, and sets the sum value to a lower temperature range of the two consecutive temperature range sections. Upper threshold.

As shown in FIG. 2, taking two temperature gear intervals as an example, specifically, the control method further includes the following steps:

In step S1040, the indoor control module samples the set temperature and invokes the first reference temperature.

In step S1041, the indoor control module calculates a sum of the set temperature and the first reference temperature.

In step S1042, the indoor control module sets the sum value as a lower limit threshold of the first temperature range section, and sets the sum value as an upper limit threshold of the second temperature range section. That is to say, if the indoor environment temperature is higher than the lower limit threshold of the first temperature range, it belongs to the first temperature range. And if the interior temperature of the vehicle is lower than the upper threshold of the second temperature range and meets the starting condition, it belongs to the second temperature range. In this way, since the set temperature is set according to the user's use requirement, the first temperature range and the second temperature range are also changed according to the user's use requirements, and therefore, the operating state of the compressor Close contact with user needs, parking air conditioning can quickly respond to user needs and achieve good cooling results.

In order to achieve more precise compressor control, referring to FIG. 8, the control method further includes: step S502, the indoor control module further calls the second reference temperature. Wherein the second reference temperature is less than the first reference temperature. Step S504, the indoor control module calculates a difference between the set temperature and the second reference temperature, and in step S506, sets the difference to be a lower threshold of the second temperature range. If the indoor environment temperature is lower than the upper limit threshold of the second temperature range and higher than the lower threshold of the second temperature range, the second temperature range is included. Independently setting the lower limit threshold of the second temperature range can reduce the influence caused by the deviation of the internal environment temperature detection accuracy and avoid the case of the compressor being accidentally stopped.

Continuing to refer to Figure 2, the control method further includes:

In step S1043-1, the indoor control module determines that the indoor environment temperature belongs to the first temperature range.

Step S1044-1, the indoor control module outputs the first level signal to the outdoor driving module through the second signal path. Preferably, the first level signal is a high level signal.

Step S1045-1: After receiving the high level signal through the second signal path, the input port of the outdoor driving module drives the compressor to operate according to the first frequency, that is, operates in the high frequency gear position.

Similarly, in step S1043-2, the indoor control module determines that the in-vehicle ambient temperature belongs to the second temperature range.

In step S1044-2, the indoor control module outputs the second level signal to the outdoor driving module through the second signal path. Preferably, the second level signal is a low level signal.

Step S1045-2, after the input port of the outdoor driving module receives the low level signal through the second signal path, the driving compressor is operated according to the second frequency, and the second frequency is smaller than the first frequency, that is, working in the low frequency gear position.

It can be understood that if the indoor control module calls a plurality of reference temperatures, a temperature range with more gradients can be formed. When the indoor control module determines that the ambient temperature of the vehicle falls into any one of the temperature range, the independent gear control signal is output through the independent signal path, and the compressor is controlled to operate according to the corresponding frequency. In this way, a more precise control of the compressor can be achieved.

In order to achieve precise control of the start and stop of the compressor, referring to Figure 9, the control method further includes the following steps:

Step S602, the indoor control module samples the set temperature and invokes the third reference temperature.

Step S604, the indoor control module calculates a difference between the set temperature and the third reference temperature.

Step S606, the indoor control module sets a difference between the set temperature and the third reference temperature as a lower limit threshold of the start condition, and sets a difference between the set temperature and the third reference temperature as an upper limit threshold of the stop condition. That is to say, when the indoor environment temperature is greater than the lower limit threshold of the starting condition, the indoor control module outputs a starting control signal to the outdoor driving module through the first signal path, and the outdoor driving module drives the compressor to start. When the ambient temperature of the vehicle is less than the upper limit threshold of the shutdown condition, the indoor control module outputs a shutdown control signal through the second signal path, and the outdoor drive module drives the compressor to stop. Preferably, the third reference temperature is less than the second reference temperature, and the margin of the determination condition is large to avoid an incorrect start or a false stop caused by the ambient temperature detection error in the vehicle. If the accuracy of the ambient temperature detection in the vehicle is high, the second reference temperature and the third reference temperature may be set equal. Optionally, the first reference temperature is 5 degrees Celsius and the second reference temperature is 3 degrees Celsius.

In order to improve the comfort of use of the parking air conditioner, when the outdoor drive module receives the start control signal, the outdoor fan is driven to start and operates according to the set speed, and the indoor control module simultaneously drives the indoor fan to operate according to the set speed. When the outdoor drive module receives the stop control signal, the outdoor fan is driven to stop at the same time, and the indoor control module drives the indoor fan to keep running according to the set speed, while maintaining energy comfort while maintaining the interior comfort.

To form protection of the compressor, preferably, if the in-vehicle ambient temperature meets the starting condition, the first timer 10-5 in the indoor control module is activated. When the first timer 10-5 reaches the first duration condition, the indoor control module outputs a power-on signal to the outdoor drive module through the first signal path. Preferably, the first time condition is 60 seconds.

When the power supply voltage does not satisfy the operating conditions, various alarm and protection mechanisms for the parking air conditioner are provided in the control method disclosed by the present invention. Figure 3 shows the specific steps of an alarm mechanism:

Step S200: In a state where the parking air conditioner is powered on, the indoor control module continuously samples the power supply voltage and determines whether the power supply voltage is greater than a high voltage cutoff setting value.

Step S201, when the compressor is running, if the sampling power supply voltage is greater than the high voltage cutoff setting value, it indicates that the power supply voltage may cause the motor or some components to be inoperable, further causing irreversible damage. In this state, the indoor control module The second timer 10-6 is activated.

In step S202, the timing parameter of the second timer 10-6 reaches the second duration, and the power supply voltage is still greater than the high voltage cutoff setting value, and the power supply voltage is too high to meet the protection condition.

In step S203, the indoor control module continuously outputs a plurality of high-voltage alarm signals at intervals of the second duration to prompt the operator that the parking air conditioner has a fault.

In step S204, in order to avoid damage to the parking air conditioner, the indoor control module generates a shutdown control signal, the parking air conditioner is turned off, and the compressor and other functional components are stopped.

Through the above steps, the parking air conditioner is protected when the power supply voltage is too high.

As shown in FIG. 4, a protection mechanism for the parking air conditioner is also provided, which specifically includes the following steps:

Step S300, under the condition that the parking air conditioner is powered on, the indoor control module continuously samples the power supply voltage and determines whether the power supply voltage is less than the low voltage protection set value.

Step S301, when the compressor is running, if the power supply voltage is lower than the low voltage protection set value, the indoor control module determines whether the power supply voltage is greater than the low voltage cutoff setting value. Similar to the high pressure cutoff setting, the low pressure cutoff setting is also based on a number of experiments. The low pressure cutoff setting is less than the low pressure protection setpoint.

Step S302, if the power supply voltage is greater than the low voltage cutoff setting value, the third timer 10-7 is started and the timing parameter of the third timer 10-7 reaches the third time length.

Step S303, when the timing parameter of the third timer 10-7 reaches the third duration, if the power supply voltage is still greater than the low voltage cutoff setting value, the protection condition is met, and the indoor control module outputs the shutdown control signal to the outdoor through the first signal path. Drive module. The third time length is preferably set to 5 seconds.

In step S304, the outdoor driving module drives the compressor to stop, thereby avoiding the impact of the low voltage on the system. At the same time, the control indoor fan operates according to the low wind gear position, and the buzzer or indicator light operates in a specific form, prompting the user that the power supply voltage is low. While the outdoor drive module drives the compressor to shut down, the third timer 10-7 begins timing.

Step S305, the indoor control module continuously samples the power supply voltage, and determines whether the power supply voltage is greater than the restored set voltage. Similar to the low-voltage cut-off setting, the recovery set voltage is also based on a large number of experiments. Restoring the set voltage ensures that the compressor operates for a minimum period of time (usually 3 minutes), avoiding frequent start and stop of the compressor. When the power supply voltage is greater than the recovery set voltage, the battery starts to charge. The recovery set voltage is greater than the low voltage protection setpoint.

Step S306, if the power supply voltage is greater than the recovery set voltage and the timing parameter of the third timer 10-7 reaches the protection duration, the compressor is allowed to start again. The protection period is preferably set to 3 minutes.

In step S307, it is determined whether the ambient temperature in the vehicle meets the starting condition again.

Step S308, if the indoor environment temperature meets the startup condition again, the indoor control module outputs a start control signal to the outdoor drive module through the first signal path.

In step S309, the outdoor drive module drives the compressor to start again.

In the above manner, when the voltage is low or in a state of charge, the compressor can be automatically protected from frequent starts and stops, resulting in additional energy consumption and damage to the compressor.

Figure 5 shows another protection mechanism for the compressor, including the following steps:

Step S400, under the condition that the parking air conditioner is powered on, the indoor control module continuously samples the power supply voltage and determines whether the power supply voltage is less than the low voltage cutoff setting value, and whether the timely parameter of the third timer 10-7 reaches the third time length.

In step S401, when both the above conditions are satisfied, the protection condition is satisfied, and the indoor control module generates a shutdown signal. The compressor and fan in the parking air conditioner are all in a stopped state. While the indoor control module generates the shutdown signal, the third timer 10-7 is cleared and the timing is restarted.

Step S402, the indoor control module receives the power-on signal generated by the remote controller, the terminal, or the human-machine interaction interface again.

Step S403, the indoor control module determines whether the power supply voltage is greater than a low voltage cutoff setting value.

If the power supply voltage is less than the low voltage cutoff setting, the indoor control module generates a shutdown signal again and forms an alert via the buzzer and/or indicator light. At the same time, the third timer 10-7 is cleared and the timing is restarted. If the power supply voltage is greater than the low voltage cutoff setting value, then in step S404, the indoor control module determines whether the power supply voltage is greater than the recovery voltage.

Step S405, if the power supply voltage is greater than the recovery voltage, it is determined whether the timing parameter of the third timer 10-7 is greater than the protection duration.

Step S406, if the timing parameter of the third timer 10-7 is greater than the protection duration, it is further determined whether the interior temperature of the vehicle meets the activation condition again.

Step S407, if the start condition is satisfied again, the indoor control module outputs a start control signal to the outdoor drive module through the first signal path.

In step S408, the outdoor drive module drives the compressor to start again.

In the above manner, when the voltage is lower than the low pressure cutoff setting value, the compressor can be automatically formed with good protection, avoiding frequent start and stop of the compressor, resulting in additional energy consumption and damage to the compressor.

Different from ordinary split type air conditioners, since the parking air conditioner adopts 24V DC power supply, it is usually used for power supply of the battery. The above control method can make the compressor start and stop according to the user demand corresponding to the set temperature, or work differently. The frequency gear position effectively reduces the energy consumption of the compressor; on the other hand, the internal structure of the outdoor unit is simplified, the control board of the outdoor unit is no longer set, the two-way communication is simplified to one-way communication, and the probability of communication failure is reduced. Improve the response speed of the parking air conditioner to make it have a better user experience. During the entire operation, it is not necessary to start the engine of the vehicle, and at the same time avoid increasing the fuel consumption of the vehicle, and automatically forming multiple protections for the compressor.

The invention also discloses a parking air conditioner, which adopts the parking air conditioner voltage detection and control method as disclosed in the above. For the specific steps of the parking air conditioner voltage detection control method, refer to the detailed description of the above embodiments and the detailed description of the drawings of the specification, and details are not described herein again. The same technical effect can be achieved by the parking air conditioner using the above control method.

As shown in FIG. 3, the parking air conditioner specifically includes an indoor control module 10 and an outdoor drive module 20. The two input terminals of the indoor control module 10 respectively receive the detected values of the ambient temperature in the vehicle and the set temperature. At least one output end of the indoor control module 10 outputs an indoor fan control signal, a speed control signal, and the like to the indoor fan 50. The indoor control module 10 and the outdoor drive module 20 communicate one-way communication, and the indoor control module 10 outputs a start control signal and/or a stop control signal to the outdoor drive module 20 through the first signal path 10-3, and the outdoor drive module 20 drives the compressor. 30 perform the corresponding work. The indoor control module 10 outputs a gear position control signal to the outdoor drive module 20 through the second signal path 10-4, and the outdoor drive module 20 drives the compressor 30 to operate according to the frequency corresponding to the gear position. The outdoor drive module 20 also drives the operation of the outdoor fan 40. Power supply paths 10-1, 10-2 are also disposed between the indoor control module 10 and the outdoor drive module 20. The first signal path and the second signal path are independently set to ensure the signal transmission rate on the one hand, and to locate the fault point on the other hand, which is beneficial to the subsequent maintenance of the parking air conditioner.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the foregoing embodiments are modified, or the equivalents of the technical features are replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A parking air conditioner voltage detection and control method includes the following steps:

   The parking air conditioner is powered on, and the indoor control module samples the power supply voltage and determines whether the power supply voltage meets the operating condition; wherein the operating condition is: the power supply voltage is greater than the low voltage protection set value and less than the high voltage cutoff setting value;

   If the operating condition is met, the indoor control module samples the ambient temperature of the vehicle;

   The indoor control module determines whether the ambient temperature of the vehicle meets the starting condition; if the starting condition is met, the indoor control module outputs a starting control signal to the outdoor driving module through the first signal path, and the outdoor driving module drives the compressor to start;

   The indoor control module determines a temperature gear interval to which the ambient temperature of the vehicle belongs, and outputs a corresponding gear position control signal to the outdoor drive module through the second signal path, and the outdoor drive module drives the compressor according to the gear position control signal. Frequency work;

   The indoor control module determines whether the ambient temperature of the vehicle meets the shutdown condition, and determines whether the power supply voltage meets a protection condition; wherein the protection condition is: the power supply voltage is greater than a high voltage cutoff set value or less than a low voltage protection set value; If the ambient temperature of the vehicle meets the shutdown condition or the power supply voltage meets the protection condition, the indoor control module outputs a shutdown control signal to the outdoor drive module through the first signal path, and the outdoor drive module drives the compressor to stop.
2. The parking air conditioner voltage detection control method according to claim 1, further comprising the following steps:

   The indoor control module samples a set temperature and invokes at least one reference temperature;

   The indoor control module calculates a sum of a set temperature and the reference temperature;

   The indoor control module sets the sum value as a lower limit threshold of a higher temperature range of the two consecutive temperature range sections, and sets the sum value as a lower temperature range of the two consecutive temperature range sections The upper threshold of the bit interval.
3. The parking air conditioner voltage detection control method according to claim 2, wherein:

   The indoor control module samples the set temperature and invokes a first reference temperature;

   The indoor control module calculates a sum of the set temperature and the first reference temperature;

   The indoor control module sets the sum value as a lower limit threshold of the first temperature range, and is an upper threshold of the second temperature range;

   When the indoor environment temperature belongs to the first temperature range, the indoor control module outputs a first level signal to the outdoor driving module through the second signal path, and the outdoor driving module drives the compressor according to the first Frequency operation; when the ambient temperature of the vehicle belongs to the second temperature range, the indoor control module outputs a second level signal to the outdoor driving module through the second signal path, and the outdoor driving module drives the compressor according to the Two frequency operation; wherein the first frequency is higher than the second frequency.
4. The parking air conditioner voltage detection control method according to claim 3, further comprising the steps of:

   The indoor control module samples a set temperature and invokes a second reference temperature;

   The indoor control module calculates a difference between the set temperature and the second reference temperature;

   The indoor control module sets the difference to be a lower threshold of the second temperature range.
5. The parking air conditioner voltage detection control method according to claim 4, further comprising the following steps:

   The indoor control module samples the set temperature and invokes a third reference temperature;

   The indoor control module calculates a difference between the set temperature and the third reference temperature;

   The indoor control module sets a difference between the set temperature and the third reference temperature as a lower limit threshold of the start condition, and sets a difference between the set temperature and the third reference temperature as the stop condition Upper threshold

   The third reference temperature is less than or equal to the second reference temperature.
6. The parking air conditioner voltage detection control method according to claim 5, wherein if the in-vehicle ambient temperature satisfies the activation condition, a first timer in the indoor control module is activated, when the first timing is When the timing parameter of the device reaches the first time period, the indoor control module outputs a startup control signal to the outdoor driving module through the first signal path.
7. The parking air conditioner voltage detection control method according to claim 6, wherein if the power supply voltage is greater than a high voltage cutoff setting value, a second timer in the indoor control module is activated, when the second timer is timed When the parameter reaches the second time period, the indoor control module continuously outputs a plurality of high-voltage alarm signals and generates a shutdown signal at intervals of the second duration.
8. The parking air conditioner voltage detection control method according to claim 7, wherein if the power supply voltage is lower than the low voltage protection setting value, the indoor control module determines whether the power supply voltage is greater than a low voltage cutoff setting value; if the power supply voltage is greater than a low voltage The third timer in the indoor control module is started, and when the timing parameter of the third timer reaches the third time, the indoor control module outputs the shutdown control signal to the outdoor driving module through the first signal path, and the outdoor The driving module drives the compressor to stop; the indoor control module determines whether the power supply voltage is greater than the recovery set voltage, and when the power supply voltage is greater than the recovery set voltage and the timing parameter of the third timer is greater than the protection duration, if the vehicle interior When the ambient temperature meets the starting condition again, the indoor control module outputs a start control signal to the outdoor drive module through the first signal path, and the outdoor drive module drives the compressor to start again.
9. The parking air conditioner voltage detection control method according to claim 8, wherein the indoor control module generates a shutdown signal when the timing parameter of the third timer reaches a third duration and the power supply voltage is less than the low voltage cutoff setting value; When the indoor control module receives the power-on signal again, it is first determined whether the power voltage is greater than the low-voltage cut-off setting value, and if it is greater than the low-voltage cut-off set value, determining whether the power voltage is greater than the recovery voltage, when When the power supply voltage is greater than the recovery set voltage and the timing parameter of the third timer is greater than the protection duration, if the indoor ambient temperature meets the startup condition again, the indoor control module outputs the startup control signal to the outdoor drive through the first signal path. The module, the outdoor driving module drives the compressor to start again; if the power voltage is less than the low voltage cutoff setting value, the indoor control module generates a shutdown signal again.
10. A parking air conditioner, wherein the parking air conditioner employs the parking air conditioner voltage detection control method according to any one of claims 1 to 9.

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