A heating and defrosting system and control method

Abstract

The application discloses a cold and warm defrosting system and a control method, relates to the technical field of vehicle defrosting systems, and comprises a defrosting panel, a cold and warm defrosting device, a solenoid valve and a controller. The cold and warm defrosting device is connected with a refrigerant source through a refrigeration pipeline and is communicated with a fuel oil boiler through a heating pipeline provided with the solenoid valve; the controller is electrically connected with each button of the defrosting panel, a temperature sensor, a damper in the cold and warm defrosting device and a PTC heater; the control method comprises the following steps: the controller responds to the electric signal of the panel button, drives the solenoid valve to be closed to block the heating of the cooling liquid of the fuel oil boiler in the refrigeration mode, controls the power-on time length of the PTC heater in stages according to the operation level of the fuel oil boiler and the threshold value of the external temperature in the heating mode, and drives the glass blowing damper, the face blowing damper or the foot blowing damper to be opened and the remaining dampers to be closed synchronously according to the trigger signal. The mechanical switching of the independent fluid channel and the quantitative adjustment of the system energy consumption parameter are realized through the hardware and the control logic.

Description

Technical Field

[0001] This application relates to the field of vehicle defrosting system technology, and in particular to a hot and cold defrosting system and control method. Background Technology

[0002] Currently, mainstream bus defrosting systems only have a heating module in their hardware configuration, specifically outputting high-temperature airflow to the external environment through PTC electric heating components or water heating circuits. Because this hardware architecture only has a single heating attribute, when the external air humidity is high, continuously blowing high-temperature airflow onto the windshield surface cannot effectively reduce the humidity level of the glass surface, making it difficult to change the condensation state that obstructs optical vision. Regarding the design of the internal airflow distribution structure, the fluid channels of existing defrosters are mostly mechanically limited to outputting airflow only to the windshield area. Although some defrosting systems have added branch air ducts connecting to the passenger's face or feet, the damper actuators inside these branch air ducts lack independent level drive signals and control logic. When receiving an operating command, the dampers inside each branch pipe can only perform synchronous mechanical opening or closing actions. This mechanical linkage or unified electronic control characteristic makes it impossible for existing systems to respond to output commands for specific single areas during fluid distribution, resulting in the system's inability to establish independent fluid transmission paths where airflow only enters specific face or foot ducts.

[0003] Therefore, the present invention provides a hot and cold defrosting system and control method to overcome the shortcomings of the prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a hot and cold defrosting system and control method, which aims to solve the problems of existing vehicle defrosting systems where the single heat source causes the inability to independently switch between hot and cold fluids, the mechanical linkage of multi-branch dampers causes the airflow to be unable to be independently guided, and the lack of temperature response logic in the heating components leads to excessive power consumption.

[0005] This invention provides the following solution:

[0006] A hot and cold defrosting system includes a defrosting panel and a hot and cold defrosting unit. The defrosting panel is equipped with an airflow adjustment knob, a cooling button, a heating button, a face blowing button, a foot blowing button, an external circulation button, a defrosting button, and an indicator light for the fuel oil boiler. The indicator light for the fuel oil boiler indicates the on / off status of the fuel oil boiler. The hot and cold defrosting unit is equipped with a face blowing damper, a foot blowing damper, a glass blowing damper, and an external circulation damper. The hot and cold defrosting unit is connected to the fuel oil boiler through a heating pipe, and a solenoid valve is installed on the heating pipe.

[0007] The hot and cold defrost unit is connected to a refrigerant source via a refrigeration pipeline. The hot and cold defrost system also includes a temperature sensor and a controller. The temperature sensor detects the outside temperature, and the controller is electrically connected to the defrost panel, the hot and cold defrost unit, the fuel boiler, the solenoid valve, and the temperature sensor.

[0008] Preferably, the heating and cooling defrosting system further includes a vehicle compartment radiator, and the coolant output from the fuel boiler flows into the vehicle compartment radiator and the heating and cooling defrosting system respectively through the heating pipe, and the solenoid valve is installed on the branch heating pipe connecting the fuel boiler and the heating and cooling defrosting system.

[0009] Preferably, the defrosting unit is equipped with a defrosting fan and a PTC heater, and the refrigeration pipeline delivers a cooling medium, which is a coolant or a refrigerant, into the defrosting unit.

[0010] A method for controlling a heating and cooling defrosting system includes the following steps:

[0011] When the refrigeration button is triggered, the controller obtains the on / off status of the fuel oil boiler. If the fuel oil boiler is on, the controller issues a shutdown command to control the solenoid valve to close, and the refrigeration pipeline provides cooling medium to the defrosting unit.

[0012] When the heating button is triggered, the controller obtains the status of the fuel boiler indicator light and the outside temperature detected by the temperature sensor, and controls the working time of the PTC heater in the hot and cold defrost unit according to the status of the fuel boiler indicator light and the outside temperature.

[0013] Preferably, when the oil-fired boiler is not turned on, controlling the operating time of the PTC heater in the hot and cold defrost unit based on the status of the oil-fired boiler indicator light and the outside temperature includes:

[0014] When the ambient temperature is greater than or equal to the first preset temperature, the PTC heater is controlled to turn on for a first preset time and then automatically turn off.

[0015] When the ambient temperature is lower than the first preset temperature, the PTC heater is controlled to remain on.

[0016] The first preset temperature is 25°C, and the first preset duration is 5 minutes.

[0017] Preferably, when the oil-fired boiler is turned on, controlling the operating time of the PTC heater in the defrosting unit based on the status of the oil-fired boiler indicator light and the outside temperature includes:

[0018] When the ambient temperature is less than or equal to the second preset temperature, the PTC heater is controlled to turn on for a second preset time and then automatically turn off.

[0019] When the ambient temperature is greater than the second preset temperature and less than or equal to the first preset temperature, the PTC heater is controlled to turn on for a first preset time and then automatically turn off.

[0020] When the ambient temperature is greater than the first preset temperature, the PTC heater is controlled to turn off;

[0021] The second preset temperature is -35℃, the second preset duration is 30min, the first preset temperature is 25℃, and the first preset duration is 5min.

[0022] Preferably, in the state where the heating button is triggered or the cooling button is triggered, the method further includes:

[0023] If the defrost button is detected to be triggered, the controller sends a control signal to open the glass blowing damper and close the face blowing damper and foot blowing damper.

[0024] Preferably, in the state where the heating button is triggered or the cooling button is triggered, the method further includes:

[0025] If the blowing button is detected to be triggered, the controller sends a control signal to open the blowing air damper and close the blowing glass air damper and the blowing foot air damper;

[0026] If the foot blowing button is detected to be triggered, the controller sends a control signal to open the foot blowing damper and close the glass blowing damper and the face blowing damper.

[0027] Preferably, when the external circulation button is detected to be triggered, the controller sends an opening signal to control the external circulation damper to open.

[0028] Preferably, the controller acquires the first to fourth airflow signals output by the airflow adjustment knob and controls the defrost fan inside the heating and cooling defrost unit to operate at the first to fourth airflow speeds.

[0029] The above solution achieves the following beneficial technical effects:

[0030] This invention solves the technical problem that existing systems can only synchronously switch on and off each branch air duct. By configuring independent face blowing, foot blowing, and defrosting buttons on the defrosting panel, and having the controller output exclusive opening and closing drive voltages to the face blowing damper, foot blowing damper, and glass blowing damper based on the trigger signals of specific buttons, the opening and closing angles of each damper are changed. This enables the independent airflow distribution mechanism under multiple operating conditions by individually guiding the cooling or heating airflow to specific areas such as the windshield, the face of the passenger, or the feet.

[0031] This invention uses a controller to read the operating level status of the oil-fired boiler and the numerical parameters of the external temperature sensor in real time. Based on preset temperature and time thresholds, it performs a step-by-step power-off operation on the PTC heater inside the defrosting unit, which solves the problem of excessive power consumption caused by continuous full-load operation of the heating components. When the system determines that the heating fluid of the oil-fired boiler has been introduced or the external temperature parameters meet the preset disconnection conditions, it shortens the power supply conduction time of the PTC heater or directly cuts off the power supply circuit, thereby reducing the overall power consumption of the system.

[0032] This invention solves the problems of fluid heat loss and temperature interference under the condition of simultaneous operation of cold and heat sources by mechanically connecting a solenoid valve in series on the heating pipeline branch connecting the fuel oil boiler and the hot and cold defrost unit. When the controller receives a cooling trigger signal and the fuel oil boiler is in the open state, it outputs a drive command to control the solenoid valve to perform a closing action. While relying on the cooling medium to output low temperature airflow to change the humidity of the glass surface, it blocks the flow of high temperature coolant into the hot and cold defrost unit, and maintains the parameter stability of the heating medium delivered by the fuel oil boiler to the radiator of the vehicle compartment. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the defrost panel structure of the present invention.

[0034] Figure 2 This is a schematic diagram of the cold and warm defrosting system of the present invention;

[0035] Figure 3 This is a schematic diagram of the control method steps of the present invention.

[0036] Among them, 100 is the defrost panel; 101 is the air volume adjustment knob; 102 is the cooling button; 103 is the heating button; 104 is the face blowing button; 105 is the foot blowing button; 106 is the external circulation button; 107 is the defrost button; 108 is the fuel boiler indicator light; 201 is the fuel boiler; 202 is the radiator in the passenger compartment; 203 is the solenoid valve; 204 is the heating pipe; 205 is the hot and cold defrost unit; 206 is the cooling pipe; 207 is the refrigerant source; 208 is the external circulation damper; 209 is the face blowing damper; 210 is the glass blowing damper; and 211 is the foot blowing damper. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] See attached document Figure 1 -Appendix Figure 2 This invention provides a hot and cold defrosting system, including a defrosting panel 100 and a hot and cold defrosting unit 205. The defrosting panel 100 is equipped with an airflow adjustment knob 101, a cooling button 102, a heating button 103, a face blowing button 104, a foot blowing button 105, an external circulation button 106, a defrosting button 107, and a fuel boiler indicator light 108, which indicates the on / off state of the fuel boiler 201. The hot and cold defrosting unit 205 is equipped with a face blowing damper 209, a foot blowing damper 211, and a glass blowing damper. Door 210 and external circulation damper 208, the hot and cold defrost unit 205 is connected to the oil-fired boiler 201 through the heating pipe 204, and the heating pipe 204 is equipped with a solenoid valve 203; the hot and cold defrost unit 205 is connected to the refrigerant source 207 through the refrigeration pipe 206, the hot and cold defrost system also includes a temperature sensor and a controller, the temperature sensor detects the outside temperature, and the controller is electrically connected to the defrost panel 100, the hot and cold defrost unit 205, the oil-fired boiler 201, the solenoid valve 203 and the temperature sensor respectively.

[0039] Specifically, the defrost panel 100 serves as the user interaction input terminal. Its housing surface is equipped with an airflow adjustment knob 101, a cooling button 102, a heating button 103, a face blowing button 104, a foot blowing button 105, an external circulation button 106, and a defrost button 107. The fuel boiler indicator light 108 is connected to the operating circuit of the fuel boiler 201, receiving electrical signals from the fuel boiler 201 to display its on / off status. The interior of the cold and hot defrost unit 205 has independent fluid guiding channels. Face blowing dampers 209, foot blowing dampers 211, and glass blowing dampers 210 are hinged at the air outlets of the corresponding channels, and a... Regarding the external circulation damper 208, in terms of fluid circulation, the heating medium inlet of the heating and cooling defrosting unit 205 is connected to the liquid outlet of the oil-fired boiler 201 through the heating pipe 204. A solenoid valve 203 is connected in series in the section of the heating pipe 204 to control the flow of the hot fluid. The refrigerant inlet of the heating and cooling defrosting unit 205 is connected to the refrigerant source 207 through the refrigerant pipe 206. The controller, as the core processing unit, has its input port connected to the buttons and temperature sensors on the defrosting panel 100 via signal lines. Its output port is connected to the actuators of each damper in the heating and cooling defrosting unit 205, the control module of the oil-fired boiler 201, and the drive cables of the solenoid valves 203. The controller processes the electrical signals from the input port and outputs independent drive voltages to each damper and valve, realizing independent opening and closing operations of single or multiple air ducts and switching control of hot and cold sources.

[0040] The heating and cooling defrosting system also includes a cabin radiator 202. The coolant output from the fuel boiler 201 flows into the cabin radiator 202 and the heating and cooling defrost unit 205 respectively through the heating pipe 204. The solenoid valve 203 is installed on the branch heating pipe connecting the fuel boiler 201 and the heating and cooling defrost unit 205.

[0041] Specifically, the heating pipeline 204 includes a main pipe and at least two parallel branch pipes. The heated coolant output from the fuel boiler 201 flows into the main pipe and is then split, flowing into the inner cavity of the radiator 202 along the first branch pipe and into the inner cavity of the defroster 205 along the second branch pipe. The solenoid valve 203 is installed on the second branch pipe connected to the defroster 205. When the controller sends a closing drive level to the solenoid valve 203, the valve core of the solenoid valve 203 blocks the second branch pipe, cutting off the flow path of the heated coolant to the defroster 205. At the same time, the heated coolant continues to flow into the radiator 202 under the action of pressure difference to perform cabin heating. This fluid distribution structure realizes the maintenance of heat supply to the main body of the cabin while cutting off the heat source input of the defroster 205.

[0042] The defrosting unit 205 is equipped with a defrosting fan and a PTC heater. The refrigeration pipe 206 delivers a cooling medium, which is either coolant or refrigerant, into the defrosting unit 205.

[0043] Specifically, a defrost fan and a PTC heater are fixedly installed inside the housing of the heating and cooling defrost unit 205. The PTC heater is electrically connected to the controller and receives the power conduction signal from the controller to perform resistance heating, serving as a second heat source independent of the oil boiler 201. The refrigeration pipe 206 is connected to the evaporator or heat exchanger structure inside the heating and cooling defrost unit 205. The refrigerant source 207 pumps cooling medium into the refrigeration pipe 206. The cooling medium can be either coolant or refrigerant depending on the system selection. This structure enables the heating and cooling defrost unit 205 to simultaneously possess a PTC electric heating heating unit and a refrigeration unit for transporting cooling medium, providing a hardware foundation for the system to output temperature difference airflow under different control logics.

[0044] See attached document Figure 3 The present invention also provides a control method for a heating and cooling defrosting system, comprising the following steps:

[0045] When the refrigeration button 102 is triggered, the controller obtains the on / off status of the fuel boiler 201. If the fuel boiler 201 is on, the controller issues a shutdown command to control the solenoid valve 203 to close, and the refrigeration pipe 206 provides cooling medium to the defrosting unit 205.

[0046] When the heating button 103 is triggered, the controller obtains the status of the fuel boiler indicator light 108 and the outside temperature detected by the temperature sensor, and controls the working time of the PTC heater in the hot and cold defrost unit 205 according to the status of the fuel boiler indicator light 108 and the outside temperature.

[0047] Specifically, in the refrigeration control process, the controller polls the electrical signal of the refrigeration button 102. When it receives the closing trigger signal, the controller reads the control circuit level of the fuel boiler 201 to identify its operating status. If it detects that the fuel boiler 201 is in the on state and the radiator 202 is performing heating work, the controller outputs a closing command signal with a set voltage amplitude to the solenoid valve 203, driving the solenoid valve 203 to mechanically close, blocking the coolant heated by the fuel boiler 201 from entering the defrost unit 205, and simultaneously controlling the refrigerant source 207 to supply refrigerant to the defrost unit 205 through the refrigeration pipe 206. Cooling medium is injected into the defroster 205. This operation cuts off the hot fluid interference under the refrigeration condition and blocks heat loss. In the heating control process, when the controller receives the closing trigger signal of the heating button 103, the controller extracts the electrical signal status of the fuel boiler indicator light 108 as the logic condition for judging whether the fuel boiler 201 is turned on. At the same time, it reads the external temperature value parameter returned by the temperature sensor through the analog-to-digital conversion circuit. The controller performs a comparison operation internally and dynamically adjusts the duration of the current output to the PTC heater according to the above two input parameters.

[0048] When the oil-fired boiler 201 is not turned on, the working time of the PTC heater in the hot and cold defrost unit 205 is controlled according to the status of the oil-fired boiler indicator light 108 and the outside temperature, including: when the outside temperature is greater than or equal to the first preset temperature, the PTC heater is controlled to turn on for the first preset time and then automatically turn off; when the outside temperature is less than the first preset temperature, the PTC heater is controlled to continue to turn on; the first preset temperature is 25℃ and the first preset time is 5min.

[0049] Specifically, the controller's internal storage area is pre-written with a first preset temperature parameter of 25℃ and a first preset duration parameter of 5min. When the controller determines that the fuel boiler 201 is not turned on through the status of the fuel boiler indicator light 108, it executes the following logic judgment steps: If the external temperature value measured by the temperature sensor is greater than or equal to 25℃, the controller outputs a conduction signal to close the power supply circuit of the PTC heater, and at the same time, the internal timing module starts timing. When the accumulated time reaches the threshold of 5min, the controller cuts off the conduction signal, and the PTC heater is powered off; If the external temperature value measured by the temperature sensor is less than 25℃, the controller maintains the output of the conduction signal to keep the power supply circuit of the PTC heater continuously closed for uninterrupted heating. This process automatically adjusts the heating cycle of the PTC heater based on a single temperature threshold.

[0050] When the oil-fired boiler 201 is turned on, the working time of the PTC heater in the hot and cold defrost unit 205 is controlled according to the status of the oil-fired boiler indicator light 108 and the outside temperature, including: when the outside temperature is less than or equal to the second preset temperature, the PTC heater is controlled to turn on for the second preset time and then automatically turn off; when the outside temperature is greater than the second preset temperature but less than or equal to the first preset temperature, the PTC heater is controlled to turn on for the first preset time and then automatically turn off; when the outside temperature is greater than the first preset temperature, the PTC heater is controlled to turn off; the second preset temperature is -35℃ and the second preset time is 30 minutes, the first preset temperature is 25℃ and the first preset time is 5 minutes.

[0051] Specifically, this embodiment provides corresponding multi-level control steps. The controller is internally programmed with a second preset temperature parameter of -35℃ and a second preset duration parameter of 30min. When the controller determines that the fuel boiler 201 is turned on (heating coolant flows from the heating pipe 204 to the defrosting unit 205), it executes a tiered judgment step: if the ambient temperature value measured by the temperature sensor is less than or equal to -35℃, the controller connects the PTC heater power supply circuit and triggers a timer. After accumulating 30 minutes, it outputs a circuit breaker signal to control its shutdown; if the measured ambient temperature value is between -35℃ and 25℃ (inclusive), the controller connects the PTC heater power supply circuit. After accumulating 5 minutes, it outputs a circuit breaker signal to control its shutdown; if the measured ambient temperature value is greater than 25℃, the controller locks the control circuit of the PTC heater, keeping it in a power-off failure state. The above steps reduce the power supply duration of the PTC heater through multi-level comparison of temperature thresholds, thereby reducing the operating power consumption of the electric heating component under the condition of coolant heat source replenishment.

[0052] In the state where the heating button 103 is triggered or the cooling button 102 is triggered, the controller also includes: if the defrost button 107 is detected to be triggered, the controller sends a control signal to open the glass blowing damper 210 and close the face blowing damper 209 and the foot blowing damper 211.

[0053] Specifically, when the controller determines that it has received the trigger signal of the heating button 103 or the cooling button 102, that is, the system has performed the pre-operation of heating or cooling, the controller listens to the electrical input terminal of the defrost button 107. When it receives the closing trigger signal, the controller allocates an exclusive damper drive level to the defrosting unit 205: it outputs a positive drive voltage to the motor controlling the glass blowing damper 210 to make it perform the rotation opening mechanical action; it simultaneously outputs a reverse drive voltage or a stop voltage to the motor controlling the face blowing damper 209 and the foot blowing damper 211 to make them rotate to the fully closed position. After this step is executed, if the pre-operation is to trigger the heating button 103, the heating airflow generated by the system is output to the windshield surface along a single channel to change the glass surface temperature; if the pre-operation is to trigger the cooling button 102, the cooling airflow generated by the system is output to the windshield surface along a single channel to change the glass surface humidity.

[0054] When the heating button 103 or the cooling button 102 is triggered, the controller further includes: if the blowing button 104 is triggered, the controller sends a control signal to open the blowing damper 209 and close the blowing glass damper 210 and the blowing foot damper 211; if the blowing foot button 105 is triggered, the controller sends a control signal to open the blowing foot damper 211 and close the blowing glass damper 210 and the blowing face damper 209.

[0055] Specifically, in the pre-cooling or pre-heating mode, the controller independently responds to the circuit connection signal of the face blowing button 104 or the foot blowing button 105. When the signal input terminal captures the electrical signal of the face blowing button 104, the controller outputs a PWM signal with the corresponding duty cycle to drive the motor of the face blowing damper 209 to open, and drives the motors of the glass blowing damper 210 and the foot blowing damper 211 to close, so that the airflow is concentrated only in the face blowing duct. Similarly, when the electrical signal of the foot blowing button 105 is captured, the controller drives the motor of the foot blowing damper 211 to open, and drives the motors of the glass blowing damper 210 and the face blowing damper 209 to close, so that the airflow is concentrated only in the foot blowing duct. When the system is in pre-heating mode, this control action causes the fluid carrying heat energy to be output to the cabin space to increase the ambient temperature; when the system is in pre-cooling mode, this action outputs low-temperature airflow to the cabin space to reduce the ambient temperature.

[0056] When the external circulation button 106 is triggered, the controller sends an opening signal to control the external circulation damper 208 to open.

[0057] Specifically, when the external circulation button 106 on the defrost panel 100 is pressed to generate a closing trigger pulse, the pulse is transmitted to the I / O port of the controller. After logical judgment, the controller sends an opening level signal to the drive motor of the external circulation damper 208 installed at the air inlet of the defrost unit 205. The level signal drives the external circulation damper 208 to flip to the set opening angle, opening the air duct inlet between the external space of the vehicle compartment and the internal air duct of the defrost unit 205, and introducing external air medium to participate in the fluid transport circulation of the system.

[0058] The controller receives the first to fourth airflow signals output by the airflow adjustment knob 101 and controls the defrost fan inside the heating and cooling defrost unit 205 to run at the first to fourth airflow speeds.

[0059] Specifically, the mechanical rotation of the airflow adjustment knob 101 corresponds to the connection of four different impedance circuits or contacts on the underlying circuitry, thereby outputting electrical signals with different parameters—first, second, third, or fourth—to the analog or digital acquisition port of the controller. The controller acquires these electrical signals in real time and maps them into four independent levels of motor drive current or speed regulation voltage through its built-in digital-to-analog converter circuit. These signals are then transmitted to the defrost fan inside the heating and cooling defrost unit 205. After receiving the corresponding drive parameters, the defrost fan adjusts its rotor speed to match and stabilize the output speed of the fan body within the preset first to fourth operating range, thereby changing the volume of airflow output per unit time.

[0060] Working principle: First, the heating and cooling defrost unit 205 is connected to the fuel oil boiler 201 via the heating pipe 204. The coolant output from the fuel oil boiler 201 flows into the radiator 202 and the heating and cooling defrost unit 205 respectively through branches of the heating pipe 204. The solenoid valve 203, which controls the flow of fluid into the branch of the heating pipe 204 where the heating and cooling defrost unit 205 is located, is electrically connected to the controller. The heating and cooling defrost unit 205 is connected to the refrigerant source 207 via the cooling pipe 206. The controller establishes electrical connections with the airflow adjustment knob 101, cooling button 102, heating button 103, face blowing button 104, foot blowing button 105, external circulation button 106, defrost button 107 on the defrost panel 100, and the fuel oil boiler indicator light 108 to receive signals. The controller triggers a signal and establishes an electrical connection with the temperature sensor and the defrost fan, PTC heater, external circulation damper 208, face blowing damper 209, glass blowing damper 210 and foot blowing damper 211 inside the defrost unit 205 to send a drive command. In the refrigeration control process, when the controller receives the trigger signal from the refrigeration button 102, the controller reads the status of the fuel boiler indicator light 108 to obtain the operating status of the fuel boiler 201. If it is determined that the fuel boiler 201 is in the open state, the controller outputs an electrical signal to drive the solenoid valve 203 to close, cutting off the path of the coolant heated by the fuel boiler 201 into the defrost unit 205, and simultaneously delivering coolant or refrigerant to the interior of the defrost unit 205 through the refrigeration pipe 206.

[0061] In the heating control process, when the controller receives the trigger signal from the heating button 103, it simultaneously obtains the on / off status indicated by the fuel boiler indicator light 108 and the outside temperature value detected by the temperature sensor, and controls the power-on duration of the PTC heater according to the logic threshold: when the fuel boiler 201 is not turned on and the outside temperature is greater than or equal to 25°C, the controller outputs a conduction signal to the PTC heater for 5 minutes and then disconnects the power; when the fuel boiler 201 is not turned on and the outside temperature is less than 25°C, the controller outputs a continuous conduction signal to the PTC heater; when the fuel boiler 201 is turned on and the outside temperature is less than or equal to -35°C, the controller outputs a conduction signal to the PTC heater for 30 minutes and then disconnects the power; when the fuel boiler 201 is turned on and the outside temperature is greater than -35°C and less than or equal to 25°C, the controller outputs a conduction signal to the PTC heater for 5 minutes and then disconnects the power; when the fuel boiler 201 is turned on and the outside temperature is greater than 25°C, the controller maintains the PTC heater in a power-off inactive state.

[0062] Under the aforementioned cooling or heating operation conditions, the controller further executes the mechanical opening and closing logic of the dampers based on the panel input signals: when a defrost button 107 trigger signal is received, the controller outputs a drive signal to the glass blowing damper 210 to control its opening operation, and simultaneously outputs a closing signal to the face blowing damper 209 and the foot blowing damper 211 to control their closing operation; when a face blowing button 104 trigger signal is received, the controller outputs a drive signal to the face blowing damper 209 to control its opening operation, and simultaneously outputs a closing signal to control the glass blowing damper 210 and the foot blowing damper 211 to perform closing operations; when a foot blowing button 105 trigger signal is received... When a signal is sent, the controller outputs a drive signal to the foot-blowing damper 211 to control its opening operation, and simultaneously outputs a closing signal to control the glass-blowing damper 210 and the face-blowing damper 209 to perform the closing operation; when the external circulation button 106 trigger signal is received, the controller outputs a drive signal to control the external circulation damper 208 to open to introduce external air medium; in all the above working processes, the controller collects the first to fourth level electrical signals output by the air volume adjustment knob 101 in real time, and inputs the corresponding level voltage or control signal to the defrost fan, driving the defrost fan inside the hot and cold defrost 205 to run continuously at the preset first to fourth level speed.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heating and cooling defrosting system, characterized in that, The system includes a defrost panel (100) and a hot and cold defrost unit (205). The defrost panel (100) is equipped with an airflow adjustment knob (101), a cooling button (102), a heating button (103), a face blowing button (104), a foot blowing button (105), an external circulation button (106), a defrost button (107), and an oil boiler indicator light (108). The oil boiler indicator light (108) indicates the on status of the oil boiler (201). The hot and cold defrost unit (205) is equipped with a face blowing damper (209), a foot blowing damper (211), a glass blowing damper (210), and an external circulation damper (208). The hot and cold defrost unit (205) is connected to the oil boiler (201) through a heating pipe (204), and a solenoid valve (203) is provided on the heating pipe (204). The hot and cold defrost unit (205) is connected to a refrigerant source (207) via a refrigeration pipe (206). The hot and cold defrost system also includes a temperature sensor and a controller. The temperature sensor detects the outside temperature, and the controller is electrically connected to the defrost panel (100), the hot and cold defrost unit (205), the fuel oil boiler (201), the solenoid valve (203), and the temperature sensor.

2. The defrosting system according to claim 1, characterized in that, The heating and cooling defrosting system also includes a cabin radiator (202). The coolant output from the fuel oil boiler (201) flows into the cabin radiator (202) and the heating and cooling defrost unit (205) respectively through the heating pipe (204). The solenoid valve (203) is installed on the branch heating pipe connecting the fuel oil boiler (201) and the heating and cooling defrost unit (205).

3. The defrosting system according to claim 1, characterized in that, The defrosting unit (205) is equipped with a defrosting fan and a PTC heater. The refrigeration pipe (206) delivers a cooling medium into the defrosting unit (205). The cooling medium is either a coolant or a refrigerant.

4. A control method for a heating and cooling defrosting system, characterized in that, The system applied to the hot and cold defrosting system according to any one of claims 1-3 includes the following steps: When the refrigeration button (102) is triggered, the controller obtains the on-state of the fuel oil boiler (201). If the fuel oil boiler (201) is on, the controller issues a shutdown command to control the solenoid valve (203) to close, and the refrigeration pipeline (206) provides cooling medium to the defrosting unit (205). When the heating button (103) is triggered, the controller obtains the status of the fuel boiler indicator light (108) and the outside temperature detected by the temperature sensor, and controls the working time of the PTC heater in the hot and cold defrost unit (205) according to the status of the fuel boiler indicator light (108) and the outside temperature.

5. The control method for a heating and cooling defrosting system according to claim 4, characterized in that, When the oil-fired boiler (201) is not turned on, the operation time of the PTC heater in the defrosting unit (205) is controlled according to the status of the oil-fired boiler indicator light (108) and the outside temperature, including: When the ambient temperature is greater than or equal to the first preset temperature, the PTC heater is controlled to turn on for a first preset time and then automatically turn off. When the ambient temperature is lower than the first preset temperature, the PTC heater is controlled to remain on. The first preset temperature is 25°C, and the first preset duration is 5 minutes.

6. The control method for a heating and cooling defrosting system according to claim 4, characterized in that, When the oil-fired boiler (201) is turned on, the operation time of the PTC heater in the defrosting unit (205) is controlled according to the status of the oil-fired boiler indicator light (108) and the outside temperature, including: When the ambient temperature is less than or equal to the second preset temperature, the PTC heater is controlled to turn on for a second preset time and then automatically turn off. When the ambient temperature is greater than the second preset temperature and less than or equal to the first preset temperature, the PTC heater is controlled to turn on for a first preset time and then automatically turn off. When the ambient temperature is greater than the first preset temperature, the PTC heater is controlled to turn off; The second preset temperature is -35℃, the second preset duration is 30min, the first preset temperature is 25℃, and the first preset duration is 5min.

7. The control method for a heating and cooling defrosting system according to claim 4, characterized in that, In the state where the heating button (103) is triggered or the cooling button (102) is triggered, the following is also included: If the defrost button (107) is detected to be triggered, the controller sends a control signal to open the glass blowing damper (210) and close the face blowing damper (209) and foot blowing damper (211).

8. The control method for a heating and cooling defrosting system according to claim 4, characterized in that, In the state where the heating button (103) is triggered or the cooling button (102) is triggered, the following is also included: If the blowing button (104) is detected to be triggered, the controller sends a control signal to open the blowing damper (209) and close the blowing glass damper (210) and the blowing foot damper (211); If the foot blowing button (105) is detected to be triggered, the controller sends a control signal to open the foot blowing damper (211) and close the glass blowing damper (210) and the face blowing damper (209).

9. The control method for a heating and cooling defrosting system according to claim 4, characterized in that, When the external circulation button (106) is detected to be triggered, the controller sends an opening signal to control the external circulation damper (208) to open.

10. The control method for a heating and cooling defrosting system according to claim 4, characterized in that, The controller acquires the first to fourth level airflow signals output by the airflow adjustment knob (101) and controls the defrost fan inside the heating and cooling defrost unit (205) to run at the first to fourth level airflow speeds.

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