An air conditioning system manipulator

Abstract

The utility model discloses an air conditioning system manipulator, including control panel, controller main part, sensor module, actuator module, relay module and air blower drive module, the present application is through the comprehensive collection of environmental parameter of many type sensor, and the accurate conversion of combination ADC voltage acquisition circuit has provided full basis for intelligent regulation, has promoted the environmental adaptability and the regulation accuracy of air conditioning system, simultaneously, the multistage protection of power supply circuit, the overcurrent overtemperature protection of relay module and the closed loop control mechanism of each module, the fault diagnosis and safety protection ability of system have been strengthened, and the equipment failure risk has been reduced effectively. Besides, the key matrix circuit has reduced the MCU interface occupancy, and the backlight regulation circuit has realized multistage brightness adaptation, and the overall design has met the use demand under different scenes while improving user operation experience, and the stability, reliability and intelligent level of air conditioning system have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning control technology, and in particular to an air conditioning system controller. Background Technology

[0002] In the current field of automotive air conditioning systems, the controller plays a crucial role in the stable operation of the entire system and the user experience. However, existing automotive air conditioning system controllers have many issues that need improvement.

[0003] Some existing controllers lack sufficient integration, resulting in poor coordination between functional modules and slow system response. This makes it difficult to accurately and efficiently adjust the air conditioning's operation to meet user needs. For example, some traditional vehicle air conditioning controllers operate with relatively independent control circuits when adjusting fan modes, temperature, and controlling the compressor. When users operate multiple functions simultaneously, control conflicts or delayed responses can easily occur.

[0004] Therefore, this utility model provides a new solution to this problem. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, the purpose of this utility model is to provide an air conditioning system controller.

[0006] The technical solution is: an air conditioning system controller, including a control panel, a controller body, a sensor module, an actuator module, a relay module, and a blower drive module;

[0007] The control panel is equipped with a power button, fan speed knob, A / C button, MODE button, AUTO button, front defogger button, rear defogger button, fresh air button, temperature adjustment knob, and emergency indicator light button, which are used to receive user operation commands.

[0008] The controller body includes an MCU and peripheral circuits. The peripheral circuits include a power supply circuit, an LCD driving circuit, a button and display screen backlight adjustment circuit, and an ADC voltage acquisition circuit. All peripheral circuits are connected to the MCU.

[0009] The sensor module includes an in-vehicle temperature sensor, an outside-vehicle temperature sensor, an evaporation sensor, a water temperature sensor, and a light sensor, used to collect ambient temperature information;

[0010] The actuator module includes a mode actuator, a fresh air actuator, and a heating and cooling actuator. The mode actuator is used to adjust the blowing mode, the fresh air actuator is used to switch between internal and external circulation, and the heating and cooling actuator is used to adjust the heating and cooling damper. The actuator module is connected to an actuator drive circuit.

[0011] The relay module includes a rear defrost relay, a blower relay, and a compressor relay, which are used to control the working status of the corresponding loads.

[0012] The blower drive module is used for speed control and closed-loop feedback of the blower's operating status.

[0013] The controller receives instructions from the control panel and signals from the sensor module, and controls the operation of the air conditioning system by controlling the actuator module, relay module and blower drive module.

[0014] Optionally, the power supply circuit includes a BAT power input terminal, an IGN power input terminal, a 12V voltage output unit, a TLE42754D voltage conversion module, and a REG1117-3.3 voltage conversion module;

[0015] The BAT power input terminal is connected to the vehicle battery to provide basic power supply;

[0016] The IGN power input terminal is connected to the vehicle ignition switch circuit and is used to receive ignition switch control signals;

[0017] The +12V voltage output unit controls the +12V voltage output state according to the IGN power signal, and outputs a 12V working voltage when the IGN power is effective.

[0018] The input terminal of the TLE42754D voltage conversion module is connected to the +12V voltage output unit to convert the +12V voltage into a stable +5V voltage.

[0019] The input terminal of the REG1117-3.3 voltage conversion module is connected to the output terminal of the TLE42754D voltage conversion module, further converting the +5V voltage into a stable +3.3V voltage.

[0020] Optionally, the LCD driving circuit includes a BU91600FUV-ME2 driving chip, which is connected to the MCU through a data interface to receive control signals and drive the display screen to display the air conditioner operating parameters.

[0021] Optionally, the button and display screen backlight adjustment circuit includes a first PWM signal generation unit, an optocoupler isolation unit, and a backlight driving unit;

[0022] The first PWM signal generation unit is connected to the MCU and is used to generate a PWM square wave signal with an adjustable duty cycle;

[0023] The optocoupler isolation unit uses an 817C optocoupler element, with its input end connected to the first PWM signal generation unit and its output end connected to the backlight driving unit, to achieve isolated signal transmission.

[0024] The backlight driving unit receives an isolated PWM signal and changes the proportion of the backlight's illumination time by adjusting the duty cycle of the PWM square wave, thereby achieving multi-level continuous adjustment of the backlight's brightness.

[0025] Optionally, the ADC voltage acquisition circuit includes multiple signal acquisition channels, which are respectively used for:

[0026] The analog signal voltage output by the sensor module is collected. The analog signal includes environmental parameter signals output by the in-vehicle temperature sensor, the outside vehicle temperature sensor, the evaporation sensor, the water temperature sensor, and the light sensor.

[0027] The analog signal voltage fed back by the actuator module is collected. The feedback signal includes the position feedback signal output by the mode actuator, the fresh air actuator, and the heating and cooling actuator.

[0028] The output voltage signal of the 12V voltage output unit is collected to monitor the power supply status of the unit.

[0029] The ADC voltage acquisition circuit converts the acquired analog voltage signals into digital signals and transmits them to the MCU.

[0030] Optionally, the actuator drive circuit includes a BD16939 driver chip, which is connected to the MCU and is used to receive control commands output by the MCU to drive the actuator to operate.

[0031] Optionally, in the relay module, the rear defrost relay uses a BTS7040-1EPA power switching device to control the on / off state of the rear defrost device; the blower relay and the compressor relay both use BSP75N power switching devices to control the switching of the working state of the blower and the compressor, respectively; each relay is connected to the MCU through a control terminal to receive the control signal output by the MCU to realize the on / off control of the corresponding load.

[0032] Optionally, the blower drive module includes a first amplifier, a second amplifier, and a second PWM signal generation unit;

[0033] The non-inverting input of the first amplifier is connected to the blower's power supply voltage, and the inverting input is connected to the blower's feedback terminal. This is used to calculate the blower's operating voltage and perform a proportional reduction. Its output is connected to the inverting input of the second amplifier.

[0034] The second PWM signal generation unit is connected to the MCU and is used to generate a PWM control signal with an adjustable duty cycle. This signal is converted into a smooth DC control voltage by an RC filter circuit and then input to the non-inverting input terminal of the second amplifier.

[0035] The second amplifier acts as a comparator, comparing the DC control voltage at the non-inverting input terminal with the blower operating voltage signal at the inverting input terminal, and outputs a corresponding level signal to control the working state of the blower.

[0036] Optionally, the MCU is a GD32F3 series microcontroller.

[0037] Through the above technical solutions, the beneficial effects of this utility model are as follows: This application comprehensively collects environmental parameters through multiple types of sensors and combines this with the precise conversion of the ADC voltage acquisition circuit, providing sufficient basis for intelligent adjustment and improving the environmental adaptability and adjustment accuracy of the air conditioning system. Simultaneously, the multi-level protection of the power supply circuit, the overcurrent and overtemperature protection of the relay module, and the closed-loop control mechanism of each module enhance the system's fault diagnosis and safety protection capabilities, effectively reducing the risk of equipment failure. Furthermore, the button matrix circuit reduces the MCU interface footprint, and the backlight adjustment circuit achieves multi-level brightness adaptation. The overall design improves the user experience while meeting the usage needs of different scenarios, significantly enhancing the stability, reliability, and intelligence level of the air conditioning system. Attached Figure Description

[0038] Figure 1 This is a system module structure diagram of this utility model.

[0039] Figure 2 This is a schematic diagram of a key matrix circuit according to an embodiment of the present invention.

[0040] Figure 3 This is a schematic diagram of a power supply circuit according to an embodiment of the present invention.

[0041] Figure 4 This is a schematic diagram of the MCU peripheral interface circuit according to an embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram of an LCD driving circuit according to an embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of the button and display screen backlight adjustment circuit according to an embodiment of the present invention.

[0044] Figure 7 This is a schematic diagram of a sensor module circuit according to an embodiment of the present invention.

[0045] Figure 8 This is a schematic diagram of an actuator drive circuit according to an embodiment of the present invention.

[0046] Figure 9 This is a schematic diagram of a relay module circuit according to an embodiment of the present invention.

[0047] Figure 10This is a circuit diagram of a blower drive module according to an embodiment of the present invention. Detailed Implementation

[0048] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figure 1 To be continued Figure 10 The detailed description of the embodiments will make this clear. All structural details mentioned in the following embodiments are based on the accompanying drawings.

[0049] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0050] like Figure 1 As shown, the air conditioning system controller of this application includes a control panel, a controller body, a sensor module, an actuator module, a relay module, and a blower drive module.

[0051] The sensor module includes an interior temperature sensor, an exterior temperature sensor, an evaporator sensor, a water temperature sensor, and a light sensor, used to collect ambient temperature information. The control panel has a power button, fan speed knob, A / C button, MODE button, AUTO button, front defogger button, rear defogger button, fresh air button, temperature adjustment knob, and emergency indicator light button, used to receive user operation commands. The controller receives commands from the control panel and signals from the sensor modules, and controls the operation of the air conditioning system through the actuator module, relay module, and blower drive module.

[0052] Specifically, pressing the power button starts the system; rotating the fan speed knob adjusts the blower speed, changing the airflow; pressing the A / C button controls the compressor, turning the cooling function on or off; the MODE button switches between different airflow modes, such as blowing on the face, feet, or windshield; the AUTO button puts the system into automatic mode, where the MCU automatically adjusts the operating status of each air conditioning component based on environmental parameters collected by the sensor module; the front and rear defogger buttons control the corresponding defoggers to remove fog from the windshield, ensuring clear visibility; the fresh air button controls the fresh air actuator, switching between internal and external air circulation modes; the temperature adjustment knob sets the target temperature, and its adjustment signal is also transmitted to the MCU; the emergency indicator button activates the emergency indication function in special circumstances.

[0053] These operating commands are transmitted as electrical signals to the MCU in the main controller via circuitry within the control panel. For example, the A / C button, MODE button, AUTO button, front defogger button, rear defogger button, fresh air button, and emergency indicator light button can be transmitted via a 2x3 button matrix circuit. Figure 2 and 5As shown, the 2*3 button matrix circuit consists of 3 row lines and 2 column lines connected to the input pins of the BU91600FUV-ME2 chip. Each button is connected to the intersection of the row and column lines. The BU91600FUV-ME2 chip, launched by ROHM, is a feature-rich chip that not only has efficient button signal processing capabilities but can also be used as a display driver chip. Its built-in logic circuit can scan the changes in column line levels row by row, accurately identify button operations, and parse them into user commands. Subsequently, the commands are stably transmitted to the MCU via the SPI interface, realizing an efficient processing flow from button command acquisition, parsing, to transmission. When used as a display driver, this chip can work with the control panel's display screen. After receiving relevant control signals from the MCU, it drives the display screen to normally display various parameters of the vehicle's air conditioning system, such as temperature, airflow, and operating mode. This simplifies the system hardware structure, reduces the complexity of connections between modules, and improves the integration and operational stability of the vehicle's air conditioning control system.

[0054] When a button is pressed, the corresponding row and column lines become conductive, forming a path. The MCU identifies the pressed button by scanning the level changes of the row and column lines. Specifically, the MCU first outputs a specific level signal to the row lines, then detects the level state of the column lines. Based on the combination of conduction of the row and column lines, it determines the corresponding button command, and then converts the command into a corresponding control signal to control the corresponding function of the air conditioning system. This button matrix circuit design reduces the MCU interface footprint while ensuring accurate and efficient transmission of button commands to the MCU, improving the integration of the control panel circuit and the reliability of signal transmission.

[0055] Furthermore, the controller body includes an MCU and peripheral circuits. The peripheral circuits include a power supply circuit, an LCD driving circuit, a button and display backlight adjustment circuit, and an ADC voltage acquisition circuit. All peripheral circuits are connected to the MCU.

[0056] The power supply circuit includes a BAT power input terminal, an IGN power input terminal, a 12V voltage output unit, a TLE42754D voltage conversion module, and a REG1117-3.3 voltage conversion module. The BAT power input terminal connects to the vehicle battery to provide basic power; the IGN power input terminal connects to the vehicle ignition switch circuit to receive ignition switch control signals; the +12V voltage output unit operates according to the IGN power signal status. When the IGN power is valid, i.e., when the ignition switch is on, it outputs a 12V operating voltage to provide initial power to subsequent circuits.

[0057] Specifically, such as Figure 3As shown, when the IGN power supply is active, the input voltage is first regulated and protected by the SMDJ36C transient voltage suppressor diode TD6. This device can quickly absorb transient overvoltages that may occur in the circuit, preventing excessive voltage from damaging subsequent circuits. The regulated voltage then passes through the ferrite bead T1 to effectively suppress high-frequency noise and electromagnetic interference in the circuit, purifying the voltage signal. Next, the processed voltage enters the control switch composed of MOSFET Q1. This MOSFET is controlled by the IGN power supply signal. When the IGN power supply is active, it conducts, allowing the voltage to continue to be transmitted; otherwise, it is cut off, cutting off the 12V voltage output and realizing the switching control of the 12V output unit. Finally, through the capacitor filtering stage, the low-frequency ripple and noise in the voltage are further filtered out by utilizing the capacitive reactance characteristics of the capacitor to the AC signal, ultimately outputting a stable and clean 12V operating voltage.

[0058] The TLE42754D voltage conversion module receives 12V from the +12V output unit and converts it using its internal low-dropout linear regulator circuit. The module's built-in overcurrent protection, overtemperature protection, and reverse polarity protection mechanisms ensure circuit safety under conditions of input voltage fluctuations, abnormal loads, or excessively high temperatures, ultimately outputting a stable +5V voltage to power components in the system that require 5V.

[0059] The REG1117-3.3 voltage conversion module receives the 5V output from the TLE42754D. Also based on the linear regulation principle, it uses an internal error amplifier to compare the output voltage with a 3.3V reference value, dynamically adjusting the resistance of the regulating transistor to accurately convert the 5V voltage to a stable 3.3V voltage. This module features low dropout voltage characteristics and high voltage accuracy, effectively suppressing ripple and noise in the input voltage.

[0060] The coordinated operation of the two-stage voltage conversion modules enables precise voltage reduction and regulation from 12V to 5V and then to 3.3V. This not only meets the voltage requirements of different components in the system, but also improves power supply reliability through multi-stage filtering and protection mechanisms, providing a solid power guarantee for the stable operation of the air conditioning system controller.

[0061] The MCU uses the GD32F3 series microcontroller, such as... Figure 4 As shown, this MCU integrates an ARM Cortex-M4 core and has a built-in high-speed ADC module, supporting high-speed acquisition and conversion of analog signals output by the sensor module, feedback signals from the actuator module, and signals from the 12V voltage output unit. It also includes multiple general-purpose input / output interfaces, which are connected to the control terminals of the control panel's button circuit, actuator drive circuit, and relay module to realize command reception and control signal output. At the same time, it has fault diagnosis and processing capabilities, and can identify and respond to abnormal signals from sensors and actuators.

[0062] like Figure 5 As shown, the LCD driving circuit includes a BU91600FUV-ME2 chip. This chip connects to a GD32F3 series MCU via an SPI interface to receive control signals and drive the display screen to show the air conditioner's operating parameters. During operation, the MCU generates corresponding display control signals based on the real-time operating status of the air conditioning system, such as set temperature, current mode, fan speed, and sensor data. These signals are then transmitted to the BU91600FUV-ME2 driver chip via the SPI interface. The driver chip receives the signals, parses and processes them, converting the digital signals into driving signals suitable for the display screen, including row scan signals, column drive signals, and grayscale control signals, thereby controlling the pixel illumination state of the display screen. In this way, the display screen can clearly and accurately present the various operating parameters of the air conditioner, allowing users to intuitively understand the operating status of the air conditioning system and achieving visualized human-machine interaction.

[0063] The button and display backlight adjustment circuit includes a first PWM signal generation unit, an optocoupler isolation unit, and a backlight driving unit, such as... Figure 6 As shown in the diagram, the first PWM signal generation unit is connected to the MCU. Under the control of the MCU, it generates a PWM square wave signal with an adjustable duty cycle. Changes in the duty cycle correspond to different brightness adjustment requirements. This PWM signal is then input to an optocoupler isolation unit using an 817C optocoupler. The optocoupler achieves electrical isolation between the input and output terminals through photoelectric conversion, preventing interference signals in subsequent circuits from being transmitted back to the front-end control circuit, thus ensuring the stability and safety of the PWM signal transmission. The isolated PWM signal is then transmitted to the backlight driving unit. By adjusting the duty cycle of the PWM square wave, the proportion of backlight illumination time is changed, i.e., the ratio of the backlight illumination time per unit time to the total illumination time. Because the PWM signal frequency is high, exceeding the human eye's resolution, the human eye perceives this periodic on / off signal as a continuous brightness change, thereby achieving multi-level continuous adjustment of the backlight brightness. In this way, a clear display effect can be provided in bright light environments, while the brightness can be reduced in dim light to reduce visual stimulation, improving the user experience under different lighting conditions and also helping to reduce energy consumption.

[0064] The ADC voltage acquisition circuit includes multiple signal acquisition channels, which are used for:

[0065] The analog signal voltage output by the sensor module is acquired, such as... Figure 7 As shown, the analog signals include environmental parameter signals output by the in-vehicle temperature sensor, the outside temperature sensor, the evaporation sensor, the water temperature sensor, and the light sensor.

[0066] The analog signal voltage fed back by the actuator module is collected. The feedback signals include the position feedback signals output by the mode actuator, the fresh air actuator, and the heating and cooling actuator.

[0067] The output voltage signal of the 12V voltage output unit is collected to monitor the power supply status of the unit.

[0068] The ADC voltage acquisition circuit converts the acquired analog voltage signals into digital signals and transmits them to the MCU. The MCU analyzes and processes this data; for example, it calculates the ambient temperature difference based on temperature sensor signals, determines whether the actuator has reached the target position based on actuator feedback signals, and assesses the power supply status through 12V voltage monitoring values. It then generates corresponding control commands to achieve precise adjustment and safety monitoring of the air conditioning system. This multi-channel acquisition and centralized conversion architecture ensures both the comprehensiveness and real-time nature of signal acquisition and provides the MCU with accurate decision-making support, making it a key component for achieving closed-loop control of the system.

[0069] The actuator module includes a mode actuator, a fresh air actuator, and a heating / cooling actuator. The mode actuator is used to adjust the blowing mode, the fresh air actuator is used to switch between internal and external circulation, and the heating / cooling actuator is used to adjust the heating / cooling damper. The actuator module is connected to an actuator drive circuit.

[0070] like Figure 8 As shown, the actuator drive circuit uses the BD16939 driver chip as its core. This chip establishes a bidirectional communication connection with the MCU through a control interface. During operation, the MCU generates action control commands for the mode actuator, fresh air actuator, and heating / cooling actuator based on user instructions and environmental parameters collected by sensors, and transmits these commands to the BD16939 driver chip. After receiving the commands, the driver chip converts the control signals into current signals sufficient to drive the actuators through its internal power amplifier circuit, controlling the internal motors of the actuators to rotate forward, reverse, or stop, thereby realizing actions such as switching the blowing mode, switching between internal and external circulation, and adjusting the heating / cooling damper. The high integration and stable driving performance of the BD16939 driver chip simplifies the connection circuit between the actuator and the MCU while ensuring the response speed and control accuracy of the actuator actions.

[0071] The relay module includes a rear defrost relay, a blower relay, and a compressor relay, used to control the operating status of the corresponding loads. For example... Figure 9 As shown, specifically, in the relay module, the rear defrost relay uses a BTS7040-1EPA power switching device to control the on / off state of the rear defrost device; the blower relay and compressor relay both use BSP75N power switching devices to control the switching of the working state of the blower and compressor, respectively; each relay is connected to the MCU through the control terminal to receive the control signal output by the MCU to realize the on / off control of the corresponding load.

[0072] The blower drive module is used for speed control of the blower, collecting real-time operating status feedback signals from the blower and feeding them back to the MCU. For example... Figure 10 As shown, the blower drive module includes a first amplifier U11A, a second amplifier U11B, and a second PWM signal generation unit. The non-inverting input of U11A is connected to the blower's power supply voltage, and the inverting input is connected to the blower's feedback terminal. This U11A is used to calculate the blower's operating voltage and perform proportional scaling. Its output is connected to the inverting input of U11B. The second PWM signal generation unit is connected to the MCU and generates a PWM control signal with an adjustable duty cycle. This signal is converted into a smooth DC control voltage by an RC filter circuit and then input to the non-inverting input of U11B. U11B acts as a comparator, comparing the DC control voltage at the non-inverting input with the blower's operating voltage signal at the inverting input, and outputs a corresponding level signal to control the blower's operating state.

[0073] Specifically, in the blower drive module, the non-inverting input of U11A is connected to the blower supply voltage via voltage divider resistors R32 and R34, and the inverting input is connected to the blower feedback terminal via voltage divider resistors R36 and R38, used to calculate and process the blower operating voltage. The formula for calculating the actual operating voltage of the blower is:

[0074]

[0075] in, This is the operating voltage of the blower. Provide power voltage to the blower. This is the voltage at the blower feedback terminal.

[0076] The first amplifier U11A uses a voltage divider circuit to proportionally reduce the supply voltage and feedback voltage, and then outputs the difference signal between the two, as shown in the following formula:

[0077]

[0078] Substituting the resistor parameters: R32=5.1KΩ, R34=10KΩ, R36=10KΩ, R38=5.1KΩ, we simplify to:

[0079]

[0080] in, This is the output voltage of the first amplifier U11A.

[0081] The second PWM signal generation unit is connected to the MCU and is used to generate a PWM control signal with an adjustable duty cycle. This signal is converted into a smooth DC control voltage by an RC filter circuit formed by resistors R17 and R62 and capacitors C126 and C127, and then input to the non-inverting input of U11B. The formula for calculating the DC control voltage is as follows: ,in, This is the filtered DC control voltage. This refers to the duty cycle of the PWM signal. This is the high-level voltage of the PWM signal.

[0082] The U11B controls the blower's operating state by comparing the DC control voltage at the non-inverting input with the blower's operating voltage signal at the inverting input and outputting a corresponding level signal: when When the output is high (12V), it drives the blower to run; when When this occurs, a low-level output (0V) stops the blower. Finally, the MCU adjusts the PWM duty cycle... Change ,make and Dynamic matching enables closed-loop control and precise speed regulation of the blower's operating voltage level.

[0083] This design not only accurately responds to airflow adjustment needs, but also compensates for speed deviations caused by load fluctuations, voltage changes, and other factors in real time, ensuring stable blower output airflow and improving system reliability.

[0084] It is important to note that both the first and second PWM signal generation units are directly configured and controlled by the MCU. The first PWM signal generation unit, under the control of the MCU, generates a PWM square wave signal with an adjustable duty cycle and a frequency exceeding the range of human visual perception. This signal is transmitted to the backlight drive unit via an optocoupler isolation unit. By adjusting the duty cycle of the PWM square wave, the backlight illumination time percentage is changed, utilizing the persistence of vision to achieve multi-level continuous adjustment of the backlight brightness. The second PWM signal generation unit, under the control of the MCU, generates a PWM control signal with an adjustable duty cycle. This signal is converted into a smooth DC control voltage by an RC filter circuit and input to the non-inverting input of the second amplifier. It is compared with the blower operating voltage signal output by the first amplifier. By outputting high and low levels, the blower's operating state is controlled. The MCU changes the DC control voltage by adjusting the duty cycle of this PWM signal, and combined with the voltage detection feedback from the first amplifier, achieves closed-loop control and precise speed adjustment of the blower's operating voltage level. Under the unified configuration of the MCU, the two PWM signal generation units independently and precisely adjust and control the backlight brightness and blower speed, respectively.

[0085] In summary, the air conditioning system controller of this application solves the problems of fragmented functions and poor coordination in traditional controllers through integrated design. Each module achieves efficient linkage through unified control by an MCU, significantly improving response speed and avoiding control conflicts and delays. Comprehensive collection of environmental parameters by multiple types of sensors, combined with precise conversion by an ADC voltage acquisition circuit, provides sufficient basis for intelligent adjustment, improving the environmental adaptability and adjustment accuracy of the air conditioning system. Simultaneously, multi-level protection of the power supply circuit, overcurrent and overtemperature protection of the relay module, and closed-loop control mechanisms for each module enhance the system's fault diagnosis and safety protection capabilities, effectively reducing equipment failure risks. Furthermore, the button matrix circuit reduces MCU interface usage, and the backlight adjustment circuit achieves multi-level brightness adaptation. The overall design improves the user experience while meeting the needs of different scenarios, significantly enhancing the stability, reliability, and intelligence level of the air conditioning system.

[0086] The above description is a further detailed explanation of the present utility model in conjunction with specific embodiments, and it should not be considered that the specific implementation of the present utility model is limited to this. For those skilled in the art to which the present utility model pertains and related fields, any extensions, operation methods, and data substitutions made based on the technical solution concept of the present utility model should fall within the protection scope of the present utility model.

Claims

1. An air conditioning system controller, characterized in that, Includes control panel, controller body, sensor module, actuator module, relay module and blower drive module; The control panel is equipped with a power button, fan speed knob, A / C button, MODE button, AUTO button, front defogger button, rear defogger button, fresh air button, temperature adjustment knob, and emergency indicator light button, which are used to receive user operation commands. The controller body includes an MCU and peripheral circuits. The peripheral circuits include a power supply circuit, an LCD driving circuit, a button and display screen backlight adjustment circuit, and an ADC voltage acquisition circuit. All peripheral circuits are connected to the MCU. The sensor module includes an in-vehicle temperature sensor, an outside-vehicle temperature sensor, an evaporation sensor, a water temperature sensor, and a light sensor, used to collect ambient temperature information; The actuator module includes a mode actuator, a fresh air actuator, and a heating and cooling actuator. The mode actuator is used to adjust the blowing mode, the fresh air actuator is used to switch between internal and external circulation, and the heating and cooling actuator is used to adjust the heating and cooling damper. The actuator module is connected to an actuator drive circuit. The relay module includes a rear defrost relay, a blower relay, and a compressor relay, which are used to control the working status of the corresponding loads. The blower drive module is used for speed control and closed-loop feedback of the blower's operating status. The controller receives instructions from the control panel and signals from the sensor module, and controls the operation of the air conditioning system by controlling the actuator module, relay module and blower drive module.

2. The air conditioning system controller according to claim 1, characterized in that, The power supply circuit includes a BAT power input terminal, an IGN power input terminal, a +12V voltage output unit, a TLE42754D voltage conversion module, and a REG1117-3.3 voltage conversion module. The BAT power input terminal is connected to the vehicle battery to provide basic power supply; The IGN power input terminal is connected to the vehicle ignition switch circuit and is used to receive ignition switch control signals; The +12V voltage output unit controls the +12V voltage output state according to the IGN power signal, and outputs a 12V working voltage when the IGN power is effective. The input terminal of the TLE42754D voltage conversion module is connected to the +12V voltage output unit to convert the +12V voltage into a stable +5V voltage. The input terminal of the REG1117-3.3 voltage conversion module is connected to the output terminal of the TLE42754D voltage conversion module, further converting the +5V voltage into a stable +3.3V voltage.

3. The air conditioning system controller according to claim 1, characterized in that, The LCD driving circuit includes a BU91600FUV-ME2 driving chip, which is connected to the MCU through a data interface to receive control signals and drive the display screen to show the air conditioner's operating parameters.

4. The air conditioning system controller according to claim 1, characterized in that, The button and display screen backlight adjustment circuit includes a first PWM signal generation unit, an optocoupler isolation unit, and a backlight driving unit. The first PWM signal generation unit is connected to the MCU and is used to generate a PWM square wave signal with an adjustable duty cycle; The optocoupler isolation unit uses an 817C optocoupler element, with its input end connected to the first PWM signal generation unit and its output end connected to the backlight driving unit, to achieve isolated signal transmission. The backlight driving unit receives an isolated PWM signal and adjusts the duty cycle of the PWM square wave to change the proportion of the backlight's illumination time, thereby achieving multi-level continuous adjustment of the backlight's brightness.

5. An air conditioning system controller according to claim 1, characterized in that, The ADC voltage acquisition circuit includes multiple signal acquisition channels, which are used for: The system collects analog signal voltages output from sensor modules, including environmental parameter signals from in-vehicle temperature sensors, out-of-vehicle temperature sensors, evaporation sensors, water temperature sensors, and light sensors. The analog signal voltages fed back by the actuator modules are collected, including the position feedback signals output by the mode actuator, the fresh air actuator, and the heating and cooling actuator; The output voltage signal of the +12V voltage output unit is collected to monitor the power supply status of the unit. The ADC voltage acquisition circuit converts the acquired analog voltage signals into digital signals and transmits them to the MCU.

6. The air conditioning system controller according to claim 1, characterized in that, The actuator drive circuit includes a BD16939 driver chip, which is connected to the MCU and is used to receive control commands output by the MCU to drive the actuator to operate.

7. The air conditioning system controller according to claim 1, characterized in that, In the relay module, the rear defrost relay uses a BTS7040-1EPA power switching device to control the on / off state of the rear defrost device; the blower relay and compressor relay both use BSP75N power switching devices to control the switching of the working state of the blower and compressor, respectively; each relay is connected to the MCU through the control terminal to receive the control signal output by the MCU to realize the on / off control of the corresponding load.

8. An air conditioning system controller according to claim 1, characterized in that, The blower drive module includes a first amplifier, a second amplifier, and a second PWM signal generation unit; The non-inverting input of the first amplifier is connected to the blower's power supply voltage, and the inverting input is connected to the blower's feedback terminal. This is used to calculate the blower's operating voltage and perform a proportional reduction. Its output is connected to the inverting input of the second amplifier. The second PWM signal generation unit is connected to the MCU and is used to generate a PWM control signal with an adjustable duty cycle. This signal is converted into a smooth DC control voltage by an RC filter circuit and then input to the non-inverting input terminal of the second amplifier. The second amplifier acts as a comparator, comparing the DC control voltage at the non-inverting input terminal with the blower operating voltage signal at the inverting input terminal, and outputs a corresponding level signal to control the working state of the blower.

9. An air conditioning system controller according to claim 1, characterized in that, The MCU used is a GD32F3 series microcontroller.

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