Low-temperature protection system and control method for a car washer

Abstract

The present invention discloses a low-temperature protection system and control method for a car wash machine. The server is used to receive the current state information of the car wash machine and transmit the current state information of the car wash machine to the administrator terminal and the user terminal. There are at least two temperature sensors, which are respectively used to measure the temperature of the air around the car wash machine and the water temperature in the water circuit of the car wash machine. The motor drive and transmission module is used to drive the brush of the car wash machine to rotate for cleaning or self-cleaning. The remote communication module is used for the main controller to upload the current state information of the car wash machine to the server, and at the same time, it also receives the car wash machine control signal. The relay switch group is electrically connected to the air pump, the water pump, the water circuit control valve 1, the water circuit control valve 2, the air circuit control valve 1, and the air circuit control valve 2 respectively, and controls the on-off of the power path. The whole system of the present invention is simple to control. Without continuously heating the water used by the car wash machine and without laying a heat preservation layer in the water circuit of the car wash machine, the low-temperature protection of the car wash machine can be achieved, saving electric power resources and reducing the operating cost of the enterprise.

Description

Technical Field

[0001] The present invention relates to the technical field of car wash machines, and more particularly to a low-temperature protection system and control method for a car wash machine. Background Art

[0002] Most automatic car wash machines are installed outdoors, and water pipes and nozzles need to be laid for the car wash machines. Once the low-temperature weather in winter arrives, the water in the water pipes of the car wash machine freezes into ice, and the volume expands rapidly, which is likely to damage the water pipes and nozzles. The prior art needs to use a heat preservation layer or a heating device to heat and keep warm the water storage device and the water pipes to prevent water from condensing, but continuous heating is required, so electricity needs to be consumed even when there is no car wash for a long time, resulting in waste of electric power resources and increase in operating costs. Moreover, the demand for car washing in rainy and snowy weather in winter will also decrease significantly, and using the heating method to maintain the water temperature is not conducive to the revenue of the enterprise.

[0003] Therefore, it is urgently needed to develop a low-temperature protection system for a car wash machine to reduce the energy consumption when the car wash machine is idle and reduce the operating costs of the enterprise, which becomes the direction of further improvement. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a low-temperature protection system for a car wash machine, which is characterized by including: a server for receiving the current state information of the car wash machine and transmitting the current state information of the car wash machine to the administrator terminal and the user terminal; a temperature sensor, a display module, a voice broadcast module, a motor drive and transmission module, a remote communication module, and a relay switch group electrically connected to the main controller. There are at least two temperature sensors, which are respectively used to measure the temperature of the air around the car wash machine and the water temperature in the water path of the car wash machine; the voice broadcast module is used to broadcast the prompt voice corresponding to the current state of the car wash machine when the car wash machine is in the low-temperature protection state or the critical protection state, to prompt the users who are washing the car or preparing to wash the car; the motor drive and transmission module is used to drive the brush of the car wash machine to rotate for cleaning or self-cleaning; the remote communication module is used for the main controller to upload the current state information of the car wash machine to the server, and at the same time, it also receives the car wash machine control signal; the relay switch group is respectively electrically connected to the air pump, the water pump, the water path control valve I, the water path control valve II, the air path control valve I, and the air path control valve II, and controls the on-off of the power path.

[0005] Preferably, the current status information of the car wash machine received by the server includes the normal temperature state of the car wash machine, the critical protection state of the car wash machine, and the low-temperature protection state of the car wash machine. Data of a second protection temperature T2, a fourth protection temperature T4, a first protection temperature T1, and a third protection temperature T3 are set in the server in ascending order, which is used to compare with the average temperature detected by the temperature sensor and determine the current status of the car wash machine. The normal temperature state of the car wash machine is the state when the average temperature T measured by the temperature sensor is not lower than the first protection temperature T1, the second protection temperature T2, the third protection temperature T3, and the fourth protection temperature T4. In this state, the car wash machine can work normally to wash cars; the critical protection state of the car wash machine is that the average temperature T measured by the temperature sensor is lower than the first protection temperature T1, higher than the second protection temperature T2, or the average temperature T measured by the temperature sensor is less than T3 within the time t1 after entering the critical protection state. The critical protection state of the car wash machine is used to monitor and protect the waterway of the car wash machine from freezing under critical low-temperature conditions. In this state, the car wash machine can still work normally to wash cars; the low-temperature protection state of the car wash machine is that the average temperature T measured by the temperature sensor is lower than the second protection temperature T2, or the average temperature T measured by the temperature sensor is less than the fourth protection temperature T4 within the time t1 after entering the low-temperature protection state. In this state, the car wash machine cannot work normally to wash cars.

[0006] A control method for a low-temperature protection system of a car wash machine as described above, characterized by comprising the following steps:

[0007] S1. When the car wash machine is initially powered on, it is judged whether the temperature sensor works effectively. If the temperature sensor cannot work normally, the server transmits the atmospheric temperature of the location where the car wash machine is located and the time of maintaining low temperature to the administrator terminal, so that the operation and maintenance personnel can decide whether to put the car wash machine in the low-temperature protection state or the critical protection state. If the temperature sensor can work normally, it is continued to judge whether the average temperature T measured by the temperature sensor is greater than the first protection temperature T1.

[0008] S2.1. Based on S1, if the average temperature T measured by the temperature sensor is greater than the first protection temperature T1, it indicates that the car wash machine is in the normal temperature state at this time and can wash cars normally.

[0009] S2.2. Based on S1, if the average temperature T measured by the temperature sensor is less than or equal to the first protection temperature T1, it is continued to judge whether the average temperature T measured by the temperature sensor is greater than the second protection temperature T2.

[0010] S3.1. Based on S2.2, if the average temperature T measured by the temperature sensor is greater than the second protection temperature T2, it indicates that the car wash machine is in the critical protection state at this time.

[0011] S3.1.1. Based on S3.1, after the car wash machine is in the critical protection state, continue to determine whether the average temperature T measured by the temperature sensor is greater than the third protection temperature T3 within the time t1;

[0012] S3.1.2. Based on S3.1.1, when the average temperature T measured by the temperature sensor is greater than the third protection temperature T3 within the time t1, the critical state of the car wash machine is lifted, and the car wash machine returns to work in the normal temperature state;

[0013] S3.1.3. Based on S3.1.1, when the average temperature T measured by the temperature sensor is less than or equal to the third protection temperature T3 within the time t1, the car wash machine continues to maintain the critical state;

[0014] S3.2. Based on S2.2, if the average temperature T measured by the temperature sensor is less than or equal to the second protection temperature T2, it indicates that the car wash machine enters the low-temperature protection state at this time, and the car wash work is suspended;

[0015] S4. Based on S3.2, if the car wash machine ends the low-temperature protection state, continue to determine whether the average temperature T measured by the temperature sensor is greater than the fourth protection temperature T4 within the time t1;

[0016] S5.1. Based on S4, if the average temperature T measured by the temperature sensor is greater than the fourth protection temperature T4 within the time t1, the car wash machine enters the critical protection state;

[0017] S5.2. Based on S4, if the average temperature T measured by the temperature sensor is less than or equal to the fourth protection temperature T4 within the time t1, the car wash machine returns to the low-temperature protection state, and the car wash work is suspended.

[0018] Preferably, the control process of the car wash machine in the critical protection state in step S3.1 includes the following steps:

[0019] S6. Determine whether the car wash machine is currently in the car wash state;

[0020] S7.1. Based on S6, if the car wash machine is currently in the car wash state, wait for the current car wash process to end, and record the end time of this car wash;

[0021] S7.2. Based on S6, if the car wash machine is currently in the non-car wash state, determine whether the interval between the current time of the car wash machine and the last car wash record time is greater than the time t6, or whether the interval between the current time of the car wash machine and the last self-cleaning time is greater than the time t6;

[0022] S8.1. Based on S7.2, if the interval between the current time of the car wash machine and the time of the last car wash record is greater than time t6, or the interval between the current time of the car wash machine and the last self-cleaning time is greater than time t6, then the self-cleaning process of the car wash machine starts, and the current self-cleaning time is recorded;

[0023] S8.2. Based on S7.2, if the interval between the current time of the car wash machine and the time of the last car wash record is not greater than time t6, or the interval between the current time of the car wash machine and the last self-cleaning time is not greater than time t6, then return to step S6;

[0024] S9. Based on S8.1, control the A and B ends of the waterway control valve one to conduct and the A and B ends of the waterway control valve two to conduct, control the water pump to run continuously for time t7, and discharge the water staying in the waterway of the car wash machine for a long time;

[0025] S10. Based on S9, control the water pump to stop rotating, and close the waterway control valve one and the waterway control valve two;

[0026] S11. Based on S10, drive the brush to rotate, and stop after a duration of t5. During the t5 time, intermittently control the A and B ends of the air path control valve one to conduct and close, and control the movement of the cylinder;

[0027] S12. Based on S11, the self-cleaning process ends, and the time when this self-cleaning ends is recorded. Thus, the critical protection state of the car wash machine ends.

[0028] Preferably, the control process of the car wash machine in the low-temperature protection state in step S3.2 includes the following steps:

[0029] S13. Determine whether the car wash machine is currently in the car wash state;

[0030] S14.1. Based on S13, if the car wash machine is currently in the car wash state, then normally process the current car wash process and wait for the car wash to end;

[0031] S14.2. Based on S13, if the car wash machine is currently in the non-car wash state, then the display module displays "The car wash machine is in low-temperature protection and has paused working" to prompt the subsequent user that the current car wash machine has entered the low-temperature protection state and has paused working;

[0032] S15. Based on S14.2, control the water pump to stop rotating;

[0033] S16. Based on S15, the B and C ends of the waterway control valve one conduct, and the A and C ends of the waterway control valve two conduct, empty the waterway between the two control valves, and at the same time empty the inside of the water pump;

[0034] S17. Based on S16, control the air pump to run, and the A and B ends of the air path control valve two remain conducting for a duration of t3;

[0035] S18. Based on S17, control B and C of the water path control valve two to conduct for a duration of t4;

[0036] S19. Based on S18, control the air pump to stop rotating and close ports A and B of the air path control valve two;

[0037] S20. Based on S19, drive the brush to rotate and stop after a duration of t5;

[0038] S21. Based on S20, put the car washer on standby and pause the car washing operation.

[0039] Preferably, in step S1, when the temperature sensor fails to work properly, the main controller sends a request temperature data instruction to the server through the remote communication module. When the server receives the request temperature data instruction, it obtains the real-time temperature data of the district or county where the car washer is located and transmits it back to the main controller of the car washer. The temperature data received by the main controller is used as the measured average temperature T, and at intervals of t0, the real-time temperature data is repeatedly obtained and the current measured average temperature T is updated. After obtaining the measured average temperature T, step S2.1 is entered for judgment.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The present invention uses a server to receive the current state information of the car washer and transmit the current state information of the car washer to the administrator terminal and the user terminal; a temperature sensor, a display module, a voice broadcast module, a motor drive and transmission module, a remote communication module, and a relay switch group electrically connected to the main controller. There are at least two temperature sensors, which are respectively used to measure the temperature of the air around the car washer and the water temperature in the water path of the car washer; the voice broadcast module is used to broadcast the corresponding prompt voice of the current state of the car washer when the car washer is in the low-temperature protection state or the critical protection state, to remind the users who are currently washing the car or about to wash the car; the motor drive and transmission module is used to drive the brush of the car washer to rotate for cleaning or self-cleaning; the remote communication module is used for the main controller to upload the current state information of the car washer to the server, and at the same time, it also receives the car washer control signal; the relay switch group is electrically connected to the air pump, the water pump, the water path control valve one, the water path control valve two, the air path control valve one, and the air path control valve two respectively, and controls the on-off of the power path. The whole system has simple control, does not require continuous heating of the water used by the car washer, and does not require laying a heat preservation layer in the water path of the car washer, so as to achieve low-temperature protection of the car washer, save electric power resources and reduce the enterprise operation cost. Description of the Drawings

[0042] Figure 1 is the system block diagram of the present invention;

[0043] Figure 2 is the control method flowchart of the present invention;

[0044] Figure 3 This is the control flow chart of the low-temperature protection state of the present invention;

[0045] Figure 4 This is the control flow chart of the critical protection state of the present invention;

[0046] Figure 5 This is the schematic diagram of the water and gas circuits of the car wash machine of the present invention;

[0047] Figure 6 This is the schematic diagram of the structure of the car wash machine of the present invention; Detailed implementation manners

[0048] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0049] As Figure 6 shown, a low-temperature protection system for a car wash machine includes a brush 1, a cylinder 2, a speed reducer 3, and a motor 4.

[0050] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0052] As Figures 1 to 6 shown, a server is used for data interaction with the remote communication modules of each car wash machine, can receive the current state information of the car wash machine and the average temperature measured by the temperature sensor, and transmit the current state information of the car wash machine to the administrator terminal and the user terminal. The administrator terminal is generally controlled by the car wash machine operation and maintenance personnel. Through the administrator terminal, the server can be accessed to view the current state information of each car wash machine, and at the same time, the operation of the car wash machine can be manually controlled or batch-controlled according to the set specifications.

[0053] A temperature sensor, a display module, a voice broadcast module, a motor drive and transmission module, a remote communication module, and a relay switch group that are electrically connected to the main controller.

[0054] There are at least two temperature sensors, which are respectively used to measure the temperature of the air around the car wash machine and the water temperature in the waterway of the car wash machine. When measuring the same type of temperature, multiple temperature sensors can be used to measure the sampling temperatures TA1, TA2, TA3,....., TAn of different sampling points (n is not less than 2, and n is the number of actually available and in-use temperature sensors). The temperature obtained by summing up the collected sampling temperatures and taking the arithmetic mean is the sampling temperature T, that is 。

[0055] In addition, the sampling temperature T can also be calculated by a weighted method. The sampling temperatures TA1, TA2, TA3,....., TAn measured by multiple temperature sensors at different sampling points can be multiplied by the weight values k1, k2,..., kn respectively and then summed up (n is not less than 2, and n is the number of actually available and in-use temperature sensors), where 。 ; ;

[0056] A voice broadcast module, which is used to broadcast the prompt voice corresponding to the current state of the car wash machine when the car wash machine is in the low-temperature protection state or the critical protection state, to prompt the users who are washing the car or about to wash the car;

[0057] The motor drive and transmission module is used to drive the brush 1 of the car wash machine to rotate for cleaning or self-cleaning. When the car wash machine is in a non-low-temperature protection state and a non-critical protection state, the car wash machine sends a control instruction to the motor drive and transmission module to control the rotation of the brush 1 for cleaning the vehicle. When the car wash machine is in the low-temperature protection state and the critical protection state, the car wash machine sends a self-cleaning instruction to the motor drive and motor transmission module to control the rotation and mutual beating of the brush 1 to remove the ice and frost condensed on the brush 1, so as to avoid scratching the car paint surface by the ice and frost on the brush 1 during car washing. Specifically, as Figure 6 shown, the motor drive and transmission module includes a motor 4 connected to a reducer 3, and the rotating shaft of the brush 1 is connected to the output shaft of the reducer 3. When the power output by the motor 4 is transmitted to the reducer 3, the brush 1 is driven to rotate. At the same time, the end of the cylinder 2 is connected to the reducer 3 and the motor 4. When the output shaft of the cylinder 2 pushes or contracts, the motor 4 and the reducer 3 are driven to make a swinging motion, so that the brush 1 can swing while rotating;

[0058] The remote communication module is used for the main controller to upload the current status information of the car wash machine to the server, and at the same time, it also receives the control signals of the car wash machine. Specifically, the control signals sent by the administrator terminal to the remote communication module of the car wash machine indirectly through the server. Once the temperature sensor detects abnormal temperature data or fails, the server can judge whether the car wash machine is in the low-temperature protection state or the critical protection state according to the atmospheric temperature at the location of the car wash machine and the duration of maintaining a low temperature.

[0059] The relay switch group is electrically connected to the air pump, water pump, waterway control valve 1, waterway control valve 2, air path control valve 1, and air path control valve 2 respectively, and controls the on and off of the power path. Specifically, the air pump is used to provide a stable air pressure driving source for the pneumatic actuators of the car wash machine. When the car wash machine is in the low-temperature protection state, the air pump provides high-pressure air flow. By controlling the conduction of AB of the air path control valve 2 and the conduction of BC of the waterway control valve, the high-pressure air flow pushes the water remaining in the waterway out, realizing the drainage of the waterway and preventing the water remaining in the waterway from freezing and damaging the waterway.

[0060] The water pump provides a high-pressure water source for washing the vehicle. The waterway control valve 1 and the waterway control valve 2 are indirectly controlled by the main controller. The relay switch group controls the conduction and cut-off of its respective ports to control the water flow direction, thereby controlling the on and off of water intake and the drainage of the waterway of the car wash machine in different states.

[0061] As Figure 5 shown, the waterway control valve 1 has three ports A, B, and C, and there are three states in total: AB conduction (at this time, AC and BC are not conductive), AB off (at this time, AC and BC are not conductive), and BC conduction. The waterway control valve 2 has three ports A, B, and C, and there are four states in total: AB conduction (at this time, AC and BC are not conductive), AB off (at this time, AC and BC are not conductive), AC conduction, and BC conduction. The air path control valve 1 and the air path control valve 2 both have two ports A and B, and are both one-way valves. When AB is conductive, the air flow can only flow from port A to port B, and both have two states: AB conduction and AB off. This embodiment only gives a connection method, and in different usage scenarios or embodiments, the corresponding relationship between the relay switch and the connected devices can be changed.

[0062] The current status information of the car wash machine received by the server includes the normal temperature status, the critical protection status, and the low-temperature protection status of the car wash machine. In the server, there are data of the second protection temperature T2, the fourth protection temperature T4, the first protection temperature T1, and the third protection temperature T3 arranged in ascending order. It should be noted that the specific values of T1 to T4 can be set on the server according to the local climate to compare with the average temperature detected by the temperature sensor and determine the current status of the car wash machine. The normal temperature status of the car wash machine is the status when the average temperature T measured by the temperature sensor is not lower than the first protection temperature T1, the second protection temperature T2, the third protection temperature T3, and the fourth protection temperature T4. In this state, the car wash machine can work normally to wash cars; the critical protection status of the car wash machine is that the average temperature T measured by the temperature sensor is lower than the first protection temperature T1 and higher than the second protection temperature T2, or the average temperature T measured by the temperature sensor is less than T3 within the time t1 after entering the critical protection state. The critical protection status of the car wash machine is used to monitor and protect the waterway of the car wash machine from freezing under critical low-temperature conditions. In this state, the car wash machine can still work normally to wash cars; the low-temperature protection status of the car wash machine is that the average temperature T measured by the temperature sensor is lower than the second protection temperature T2, or the average temperature T measured by the temperature sensor is less than the fourth protection temperature T4 within the time t1 after entering the low-temperature protection state. In this state, the car wash machine cannot work normally to wash cars.

[0063] The control method of the present invention includes the following steps:

[0064] S1. When the car wash machine is initially powered on, it is judged whether the temperature sensor works effectively. If the temperature sensor cannot work normally, the server will transmit the atmospheric temperature of the location where the car wash machine is located and the time of maintaining low temperature to the administrator terminal, so that the operation and maintenance personnel can decide whether to put the car wash machine in the low-temperature protection state or the critical protection state. Specifically, when the temperature sensor cannot work normally, the main controller sends a request temperature data instruction to the server through the remote communication module. When the server receives the request temperature data instruction, it obtains the real-time temperature data of the district or county where the car wash machine is located and transmits it back to the main controller of the car wash machine. The temperature data received by the main controller is used as the measured average temperature T, and at intervals of time t0, the real-time temperature data is repeatedly obtained and the current measured average temperature T is updated. After obtaining the measured average temperature T, it enters step S2.1 for judgment;

[0065] If the temperature sensor can work normally, it is continued to judge whether the average temperature T measured by the temperature sensor is greater than the first protection temperature T1;

[0066] S2.1. Based on S1, if the average temperature T measured by the temperature sensor is greater than the first protection temperature T1, it indicates that the car wash machine is in the normal temperature state at this time and can work normally to wash cars;

[0067] S2.2. Based on S1, if the average temperature T measured by the temperature sensor is less than or equal to the first protection temperature T1, continue to determine whether the average temperature T measured by the temperature sensor is greater than the second protection temperature T2;

[0068] S3.1. Based on S2.2, if the average temperature T measured by the temperature sensor is greater than the second protection temperature T2, it indicates that the car washer is in a critical protection state.

[0069] S3.1.1. Based on S3.1, when the car washer is in the critical protection state, continue to determine whether the average temperature T measured by the temperature sensor is greater than the third protection temperature T3 within time t1;

[0070] S3.1.2. Based on S3.1.1, when the average temperature T measured by the temperature sensor is greater than the third protection temperature T3 within time t1, the critical state of the car washing machine is released and the car washing machine returns to normal temperature operation;

[0071] S3.1.3. Based on S3.1.1, when the average temperature T measured by the temperature sensor is less than or equal to the third protection temperature T3 within time t1, the car washing machine continues to maintain the critical state;

[0072] S3.2. Based on S2.2, if the average temperature T measured by the temperature sensor is less than or equal to the second protection temperature T2, the car washing machine enters the low-temperature protection state and the car washing operation is suspended;

[0073] S4. Based on S3.2, if the car washer ends the low-temperature protection state, continue to determine whether the average temperature T measured by the temperature sensor is greater than the fourth protection temperature T4 within time t1;

[0074] S5.1. Based on S4, if the average temperature T measured by the temperature sensor is greater than the fourth protection temperature T4 within time t1, the car washing machine enters a critical protection state;

[0075] S5.2. Based on S4, if the average temperature T measured by the temperature sensor is less than or equal to the fourth protection temperature T4 within time t1, the car washing machine returns to the low temperature protection state and suspends the car washing operation.

[0076] The control process of the car washing machine in the critical protection state in step S3.1 includes the following steps:

[0077] S6, determining whether the car washing machine is currently in the car washing state;

[0078] S7.1. Based on S6, if the car wash machine is currently in the car wash state, wait for the current car wash process to end and record the end time of this car wash;

[0079] S7.2. Based on S6, if the car wash machine is currently not in the car wash state, determine whether the interval between the current car wash machine time and the last car wash record time is greater than time t6, or whether the interval between the current car wash machine time and the last self-cleaning time is greater than time t6;

[0080] S8.1. Based on S7.2, if the interval between the current car wash time and the last car wash time is greater than time t6, or the interval between the current car wash time and the last self-cleaning time is greater than time t6, the car wash self-cleaning process begins and the current self-cleaning time is recorded;

[0081] S8.2. Based on S7.2, if the interval between the current time of the car wash machine and the time of the last car wash record is not greater than time t6, or the interval between the current time of the car wash machine and the time of the last self-cleaning is not greater than time t6, then return to step S6;

[0082] S9. Based on S8.1, connect terminals A and B of water circuit control valve 1 and terminals A and B of water circuit control valve 2, and control the water pump to run continuously for time t7 to drain the water that has been trapped in the water circuit of the car washer for a long time.

[0083] S10: Based on S9, the water pump is stopped and the first and second water control valves are closed;

[0084] S11. Based on S10, the brush 1 is driven to rotate for a duration of t5 and then stops. During the t5 period, the A and B terminals of the air circuit control valve 1 are intermittently controlled to be open and closed to control the movement of the cylinder 2. This step is to remove residual water droplets on the surface of the brush 1 of the car washer to prevent the water droplets from condensing into ice due to being in a critical low temperature environment slightly above the freezing point for a long time.

[0085] S12. Based on S11, the self-cleaning process ends, and the time when the self-cleaning ends is recorded. At this point, the critical protection state of the car washing machine ends.

[0086] The control process of the car washing machine in the low temperature protection state in step S3.2 includes the following steps:

[0087] S13, determining whether the car washing machine is currently in the car washing state;

[0088] S14.1. Based on S13, if the car wash machine is currently in the car wash state, the car wash process is processed normally and the car wash is completed.

[0089] S14.2. Based on S13, if the car wash machine is currently not washing cars, the display module displays "Car wash machine is in low temperature protection, suspended" to remind subsequent users that the car wash machine has entered the low temperature protection state and has suspended operation;

[0090] S15. Based on S14.2, control the water pump to stop;

[0091] S16. Based on S15, the B and C ends of the first waterway control valve are conducted, and the A and C ends of the second waterway control valve are conducted to empty the waterway between the two control valves and simultaneously empty the inside of the water pump.

[0092] S17. Based on S16, control the air pump to operate, and the A and B ends of the second air path control valve remain conducted for a duration of t3.

[0093] S18. Based on S17, control the B and C of the second waterway control valve to be conducted for a duration of t4.

[0094] S19. Based on S18, control the air pump to stop rotating and close the A and B ends of the second air path control valve.

[0095] S20. Based on S19, drive the brush 1 to rotate and stop after a duration of t5.

[0096] S21. Based on S20, the car washer is on standby and the car washing work is paused. The car washer will remain in the low-temperature protection state until the average temperature T measured by the temperature sensor is greater than the fourth protection temperature T4 within the time t1, and then the low-temperature protection state will end.

[0097] The overall system of the present invention is simply composed, without the need to continuously heat the water used by the car washer or lay a heat preservation layer in the waterway of the car washer, and it can achieve the low-temperature protection of the car washer, saving electric power resources and reducing the enterprise operation cost. Whether the temperature sensor is working or not, it can effectively monitor the state of the car washer itself.

[0098] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of the rights of the present invention. Therefore, the modifications, equivalent changes, improvements, etc. made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A low-temperature protection system for a car wash machine, characterized in that, Comprising: A server, configured to receive the current car wash machine status information and transmit the current status information of the car wash machine to an administrator terminal and a user terminal; A temperature sensor, a display module, a voice broadcast module, a motor drive and transmission module, a remote communication module, and a relay switch group, which are electrically connected to a main controller. There are at least two temperature sensors, respectively used to measure the temperature of the air around the car wash machine and the water temperature in the water circuit of the car wash machine; The voice broadcast module is used to broadcast a prompt voice corresponding to the current status of the car wash machine when the car wash machine is in a low-temperature protection state or a critical protection state, to prompt users who are currently washing or about to wash a car; the motor drive and transmission module is used to drive the brush (1) of the car wash machine to rotate for cleaning or self-cleaning; the remote communication module is used for the main controller to upload the current status information of the car wash machine to the server, and also receive car wash machine control signals; the relay switch group is respectively electrically connected to an air pump, a water pump, a water circuit control valve 1, a water circuit control valve 2, an air circuit control valve 1, and an air circuit control valve 2, and controls the on / off of the power path; the current status information of the car wash machine received by the server includes the normal temperature state of the car wash machine, the critical protection state of the car wash machine, and the low-temperature protection state of the car wash machine. In the server, there are data of a second protection temperature T2, a fourth protection temperature T4, a first protection temperature T1, and a third protection temperature T3 arranged in ascending order, which are used to compare with the average temperature detected by the temperature sensor and determine the current status of the car wash machine. The normal temperature state of the car wash machine is the state when the average temperature T measured by the temperature sensor is not lower than the first protection temperature T1, the second protection temperature T2, the third protection temperature T3, and the fourth protection temperature T4. In this state, the car wash machine can work normally to wash a car; the critical protection state of the car wash machine is that the average temperature T measured by the temperature sensor is lower than the first protection temperature T1, higher than the second protection temperature T2, or the average temperature T measured by the temperature sensor is less than T3 within the time t1 after entering the critical protection state. The critical protection state of the car wash machine is used to monitor and protect the water circuit of the car wash machine from freezing under critical low-temperature conditions. In this state, the car wash machine can still work normally to wash a car; the low-temperature protection state of the car wash machine is that the average temperature T measured by the temperature sensor is lower than the second protection temperature T2, or the average temperature T measured by the temperature sensor is less than the fourth protection temperature T4 within the time t1 after entering the low-temperature protection state. In this state, it cannot work normally to wash a car; when the car wash machine is in a low-temperature protection state or a critical protection state, the car wash machine sends a self-cleaning instruction to the motor drive and motor transmission module to control the rotation and mutual beating of the brush (1) to remove the ice and frost condensed on the brush (1).

2. The control method of the low-temperature protection system applied to a car washing machine as described in claim 1, characterized in that, Comprising the following steps: S1. When the car washer is initially powered on, it is judged whether the temperature sensor is working effectively. If the temperature sensor cannot work properly, the server will transmit the atmospheric temperature at the location of the car washer and the time of maintaining low temperature to the administrator terminal, allowing the operation and maintenance personnel to decide whether to put the car washer in the low-temperature protection state or the critical protection state. If the temperature sensor can work properly, it continues to judge whether the average temperature T measured by the temperature sensor is greater than the first protection temperature T1; S2.

1. Based on S1, if the average temperature T measured by the temperature sensor is greater than the first protection temperature T1, it indicates that the car washer is in the normal temperature state at this time and can carry out car washing work normally; S2.

2. Based on S1, if the average temperature T measured by the temperature sensor is less than or equal to the first protection temperature T1, it continues to judge whether the average temperature T measured by the temperature sensor is greater than the second protection temperature T2; S3.

1. Based on S2.2, if the average temperature T measured by the temperature sensor is greater than the second protection temperature T2, it indicates that the car washer is in the critical protection state at this time; S3.1.

1. Based on S3.1, after the car washer is in the critical protection state, it continues to judge whether the average temperature T measured by the temperature sensor is greater than the third protection temperature T3 within the time t1; S3.1.

2. Based on S3.1.1, when the average temperature T measured by the temperature sensor is greater than the third protection temperature T3 within the time t1, the critical state of the car washer is lifted and the car washer returns to work in the normal temperature state; S3.1.

3. Based on S3.1.1, when the average temperature T measured by the temperature sensor is less than or equal to the third protection temperature T3 within the time t1, the car washer continues to maintain the critical state; S3.

2. Based on S2.2, if the average temperature T measured by the temperature sensor is less than or equal to the second protection temperature T2, it indicates that the car washer enters the low-temperature protection state at this time and pauses the car washing work; S4. Based on S3.2, if the car washer ends the low-temperature protection state, it continues to judge whether the average temperature T measured by the temperature sensor is greater than the fourth protection temperature T4 within the time t1; S5.

1. Based on S4, if the average temperature T measured by the temperature sensor is greater than the fourth protection temperature T4 within the time t1, the car washer enters the critical protection state; S5.

2. Based on S4, if the average temperature T measured by the temperature sensor is less than or equal to the fourth protection temperature T4 within the time t1, the car washer returns to the low-temperature protection state and pauses the car washing work.

3. The control method of the low-temperature protection system of a car washing machine according to claim 2, characterized in that The control process when the car washer is in the critical protection state in step S3.1 includes the following steps: S6. Judge whether the car washer is currently in the car washing state; S7.

1. Based on S6, if the car washer is currently in the car washing state, wait for the current car washing process to end and record the end time of this car washing; S7.

2. Based on S6, if the car washer is currently in the non-car washing state, judge whether the interval between the current time of the car washer and the time of the last car washing record is greater than the time t6, or whether the interval between the current time of the car washer and the time of the last self-cleaning is greater than the time t6; S8.

1. Based on S7.2, if the interval between the current time of the car wash machine and the time of the last car wash record is greater than time t6, or the interval between the current time of the car wash machine and the last self-cleaning time is greater than time t6, then the self-cleaning process of the car wash machine starts, and the current self-cleaning time is recorded; S8.

2. Based on S7.2, if the interval between the current time of the car wash machine and the time of the last car wash record is not greater than time t6, or the interval between the current time of the car wash machine and the last self-cleaning time is not greater than time t6, then return to step S6; S9. Based on S8.1, control the A and B ends of the waterway control valve 1 to conduct and the A and B ends of the waterway control valve 2 to conduct, control the water pump to run continuously for time t7, and drain the water that has stayed in the waterway of the car wash machine for a long time; S10. Based on S9, control the water pump to stop rotating, and close the waterway control valve 1 and the waterway control valve 2; S11. Based on S10, drive the brush (1) to rotate, and stop after a duration of t5. During the t5 time, intermittently control the A and B ends of the air path control valve 1 to conduct and close, and control the movement of the cylinder (2); S12. Based on S11, the self-cleaning process ends, and the time when this self-cleaning ends is recorded. Thus, the critical protection state of the car wash machine ends.

4. The control method of the low-temperature protection system of a car washer according to claim 3, characterized in that, The control process of the car wash machine in the low-temperature protection state in step S3.2 includes the following steps: S13. Determine whether the car wash machine is currently in the car wash state; S14.

1. Based on S13, if the car wash machine is currently in the car wash state, then normally process the current car wash process and wait for the car wash to end; S14.

2. Based on S13, if the car wash machine is currently in the non-car wash state, then the display module displays "The car wash machine is in low-temperature protection and has paused working" to prompt subsequent users that the current car wash machine has entered the low-temperature protection state and has paused working; S15. Based on S14.2, control the water pump to stop rotating; S16. Based on S15, the B and C ends of the waterway control valve 1 conduct, and the A and C ends of the waterway control valve 2 conduct, empty the waterway between the two control valves, and at the same time empty the inside of the water pump; S17. Based on S16, control the air pump to run, and the A and B ends of the air path control valve 2 remain conducting for a duration of t3; S18. Based on S17, control the B and C of the waterway control valve 2 to conduct for a duration of t4; S19. Based on S18, control the air pump to stop rotating, and close the A and B ends of the air path control valve 2; S20. Based on S19, drive the brush (1) to rotate, and stop after a duration of t5; S21. Based on S20, the car wash machine is on standby and pauses the car wash work.

5. The control method of the low-temperature protection system of a car washing machine according to claim 3, characterized in that, In step S1, when the temperature sensor cannot work properly, the main controller sends a request temperature data instruction to the server through the remote communication module. When the server receives the request temperature data instruction, it obtains the real-time temperature data of the district or county where the car wash machine is located, and transmits it back to the main controller of the car wash machine. The temperature data received by the main controller is used as the measured average temperature T, and at intervals of time t0, repeat to obtain the real-time temperature data and update the current measured average temperature T. After obtaining the measured average temperature T, enter step S2.1 for judgment.

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