Integrated vehicle-mounted air blower control system

Abstract

The invention discloses an integrated vehicle-mounted air blower control system which comprises an MCU, a power module, a BLDC motor driving module, a BDC driving module, a low-side driving module, an analog signal input module, a digital signal input module, a CAN communication module and an EEPROM data storage module. A brushless motor can be driven, closed-loop control of rotating speed can be realized, and air door opening and closing angle control of five air door motors such as left temperature, right temperature, mode, internal and external circulation and defrosting can be realized; data of sensors such as an in-vehicle condensation inlet temperature sensor, an in-vehicle condensation outlet temperature sensor, a front left foot and face blowing temperature sensor, a front right foot and face blowing temperature sensor, an evaporator temperature sensor, a pressure sensor, a sunlight sensor, an in-vehicle temperature sensor and an AQS air quality sensor can be collected and processed. A seat heating relay switch, a compressor control valve drive, a PM2.5 sensor and a negative ion generator drive can be controlled. The system integrates the functions of a plurality of air-conditioning blower systems, simplifies the architecture and wiring harness layout of the air-conditioning blower systems, and reduces the cost.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and particularly to an on-vehicle blower control system. Background Art

[0002] With the continuous development of automotive electrification, the trend of vehicle architecture integration has become more obvious, and the functional integration of automotive electronic devices has increased accordingly. The on-vehicle blower system is an important part of the automotive air conditioning system, which has the function of blowing cold or warm air on the air conditioning evaporator into the vehicle. By adjusting the rotational speed and air volume, it can realize the cooling or heating of the air inside the vehicle, control the temperature and air circulation inside the vehicle, and provide a comfortable riding environment for passengers.

[0003] Currently, most automotive blower controllers are of mechatronic structure, with the controller and the blower motor installed together and assembled in the air conditioning box. Due to the limitations of the installation position and the motor size, the size of the blower controller can only follow the size of the motor, resulting in a relatively single function and low integration of the blower controller. Considering the vehicle as a whole, the control flexibility of the air conditioning blower system is low, the layout and wiring harness are relatively redundant, and there is a lack of cost advantage. Therefore, an integrated on-vehicle blower control system is particularly important. Summary of the Invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section. These simplified concepts are all simplified from the prior art in the field, which will be further described in detail in the Detailed Description section. The Summary of the Invention section of the present invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] The technical problem to be solved by the present invention is to provide an integrated on-vehicle blower control system, which can drive a brushless motor and achieve closed-loop speed control, can control the opening and closing angles of the left temperature air door motor, right temperature air door motor, mode air door motor, internal and external circulation air door motor, and defrost air door motor, can collect and process data of multiple sensors of the air conditioning blower system such as the in-vehicle condensation inlet and outlet temperature sensors, front left and front right footwell temperature sensors, front left and front right face temperature sensors, evaporator temperature sensor, pressure sensor, sunlight sensor, in-vehicle temperature sensor, etc., and the AQS air quality sensor, and can control the left and right seat heating relay switches, compressor control valve drive, PM2.5 sensor, and negative ion generator drive. This system integrates multiple functions of the air conditioning blower system, solves the problems of relatively single function and low integration of the traditional blower controller, as well as low control flexibility of the air conditioning blower system, and relatively redundant layout and wiring harness, thereby simplifying the architecture of the air conditioning blower system and the wiring harness layout, and reducing the cost of the air conditioning blower system.

[0006] To solve the above technical problems, an integrated vehicle blower control system provided by the present invention includes:

[0007] An MCU, which is used to identify the on / off information of the vehicle air conditioner button switch, identify and control the closed-loop control of the brushless motor speed and the damper angle mode control of the damper motor, collect and process external sensor data and the damper motor position feedback signal, control the drive of the PM2.5 sensor and the negative ion generator, and can realize the drive control of the seat heating and the compressor control valve through the low-side drive module;

[0008] A power supply module, which includes two independent power supplies, and outputs corresponding voltages according to the selected power supply chip type to supply power to other modules and circuits of the system and provide diagnostic protection functions;

[0009] A BLDC (Brushless Direct Current Motor) motor drive module, which includes a three-phase pre-driver chip, MOSFET switches, and current sampling. The pre-driver chip drives the MOSFET switches, and the motor drive current is collected through dual-resistance current sampling. It can realize the closed-loop control of the sensorless brushless motor FOC (Field Oriented Control) and collect the three-phase back electromotive force;

[0010] A BDC (Brushed Direct Current Motor) drive module, which combines two-channel half-bridges into a full-bridge drive mode through a multi-channel integrated intelligent half-bridge drive chip, can realize the control of the damper motor drive, and sets a single half-bridge drive to the high-side drive mode to control the drive of the PM2.5 sensor and the negative ion generator;

[0011] A low-side drive module, which can realize the low-side drive control of the seat heating relay switch and the compressor control valve through a multi-channel integrated intelligent low-side drive chip;

[0012] An analog signal input module, which is used to collect external sensor signals and the damper motor position feedback signal;

[0013] A digital signal input module, which is used to identify the air conditioner switch button signal and collect and process the feedback signals of the AQS air quality sensor and the PM2.5 sensor;

[0014] CAN communication module, the CAN communication module includes a high-speed CAN transceiver, which is used to connect to the in-vehicle CAN network to achieve in-vehicle information interaction and can implement XCP (Universal Calibration Protocol) calibration;

[0015] EEPROM data storage module, the EEPROM data storage module writes calibration information and logistics data information through the MCU.

[0016] Further improvement, the MCU recognizes the ON / OFF information of the vehicle air-conditioning button switch through the digital signal input module to execute the ON / OFF function of the blower. It receives and sends the required vehicle information and diagnostic service functions through the LIN or CAN communication module integrated in the power supply module. It collects and monitors the ADC values of the in-vehicle condensation inlet and outlet temperature sensors, front left and right footwell temperature sensors, front left and right face temperature sensors, evaporator temperature sensor, pressure sensor, sunlight sensor, AQS air quality sensor, in-vehicle temperature sensor, and the position feedback ADC signals of the left air door motor, right air door motor, mode air door motor, internal and external circulation air door motor, and defrost air door motor through the analog signal input module, compares them with the set software diagnostic thresholds, and can realize the closed-loop control of the blower speed by controlling the brushless motor through the BLDC motor drive module, and supports motor stall, overcurrent, open circuit, and short circuit diagnosis. It can realize the drive control of the left temperature air door motor, right temperature air door motor, mode air door motor, internal and external circulation air door motor, and defrost air door motor, the drive control of the PM2.5 sensor and the negative ion generator through the BDC drive module, and supports overcurrent, open circuit, and short circuit diagnosis. It can realize the drive control of the left and right seat heaters and the compressor control valve through the low-side drive module, and supports overcurrent and open circuit diagnosis. It can realize the storage of system data and logistics data through the EEPROM data storage module.

[0017] Further improvement, the power supply module includes a SBC (System Basis Chip) power supply and an LDO (Low Dropout Regulator) power supply. The SBC power supply can output 3.3V voltage according to the power supply chip for MCU power supply and has a built-in LIN transceiver; the LDO power supply can include an output of 5V voltage and an AVCC (Analog Voltage at the Common Collector) output by the voltage follower according to the power supply chip. The 5V voltage is used as the reference voltage AVCC of the voltage follower and for the internal logic circuit and the CAN transceiver power supply. The AVCC voltage is used for external sensor power supply and supports the diagnostic protection functions of AVCC short circuit to ground and short circuit to KL30.

[0018] Further improvement, the BLDC motor drive module includes a three-phase pre-driver chip and the first to sixth MOSFET switches Q1 to Q6, a sampling resistor, a first resistor R1, and a second resistor R2. Among them, the first end 1 of the first MOSFET switch Q1 is connected to the GHA pin of the pre-driver chip, the first end 1 of the second MOSFET switch Q2 is connected to the GHB pin of the pre-driver chip, the first end 1 of the third MOSFET switch Q3 is connected to the GHC pin of the pre-driver chip. The second ends 2 of the first to third MOSFET switches Q1 to Q3 are commonly connected to the KL30 power supply terminal. The first end 1 of the fourth MOSFET switch Q4 is connected to the GLA pin of the pre-driver chip, the third end 3 is connected to one end of the sampling resistor, the first resistor R1, and is simultaneously connected to the positive input SPA pin of the differential current sampling A module of the pre-driver chip. The other end of the sampling resistor, the first resistor R1, is connected to the negative input SNA pin of the differential current sampling A module of the pre-driver chip and is connected to the ground. The first end 1 of the fifth MOSFET switch Q5 is connected to the GLB pin of the pre-driver chip, the third end 3 is connected to one end of the sampling resistor, the second resistor R2, and is simultaneously connected to the positive input SPB pin of the differential current sampling B module of the pre-driver chip. The other end of the sampling resistor, the second resistor R2, is connected to the negative input SNB pin of the differential current sampling B module of the pre-driver chip and is connected to the ground. The first end 1 of the sixth MOSFET switch Q6 is connected to the GLC pin of the pre-driver chip, the third end 3 is connected to the ground. The third end of the first MOSFET switch Q1 is connected to the second end of the fourth MOSFET switch Q4 to form a driving end U, which is connected to the U phase of the external brushless motor. The third end of the second MOSFET switch Q2 is connected to the second end of the fifth MOSFET switch Q5 to form a driving end V, which is connected to the V phase of the external brushless motor. The third end of the third MOSFET switch Q3 is connected to the second end of the sixth MOSFET switch Q6 to form a driving end W, which is connected to the W phase of the external brushless motor. One end of the third resistor R3 is connected to the driving end U, the other end is connected to one end of the fourth resistor R4 and one end of the first capacitor C1 and is commonly connected to the ADC input pin of the MCU. The other ends of the fourth resistor R4 and the first capacitor C1 are connected to the ground. Through resistor voltage division, the back electromotive force of the U phase can be collected. One end of the fifth resistor R5 is connected to the driving end V, the other end is connected to one end of the sixth resistor R6 and one end of the second capacitor C2 and is commonly connected to the ADC input pin of the MCU. The other ends of the sixth resistor R6 and the second capacitor C2 are connected to the ground. Through resistor voltage division, the back electromotive force of the V phase can be collected. One end of the seventh resistor R7 is connected to the driving end W, the other end is connected to one end of the eighth resistor R8 and one end of the third capacitor C3 and is commonly connected to the ADC input pin of the MCU. The other ends of the eighth resistor R8 and the third capacitor C3 are connected to the ground. Through resistor voltage division, the back electromotive force of the W phase can be collected. The MOSFET switch is driven by the pre-driver chip, and the motor drive current is collected through dual-resistor current sampling.It can achieve sensorless and brushless motor FOC closed-loop control. By collecting the three-phase back electromotive force through the MCU, it can identify whether the brushless motor has stopped braking.

[0019] For further improvement, the BDC drive module includes an intelligent half-bridge drive chip. This chip has built-in MOSFET switching tubes and has 12-channel half-bridge drive outputs. By combining two channels of half-bridges into a full-bridge drive mode, it can control the driving of the left temperature air door motor, the right temperature air door motor, the mode air door motor, the inside / outside circulation air door motor, and the defrost air door motor. By setting a single-channel half-bridge drive to the high-side drive mode, it can control the driving and control of the PM2.5 sensor and the negative ion generator.

[0020] Further improvement: The analog signal input module collects external sensor signals and the position feedback signals of the air damper motors. The external sensor signals and the position feedback signals of the air damper motors are respectively connected to one end of resistors with different resistances, and the other end of the resistor is connected to the AVCC voltage. The external sensor signals and the position feedback signals of the air damper motors respectively pass through RC filter circuits and are input to the switch chips. Among them, the signals of the front left face temperature sensor, the front right face temperature sensor, the front left foot temperature sensor, the front right foot temperature sensor, the in-vehicle condensation inlet temperature sensor, the in-vehicle condensation outlet temperature sensor, the evaporator temperature sensor, and the AQS air quality sensor are respectively connected to the S0 - S7 pins of the first switch chip. The pressure sensor signal, the in-vehicle temperature sensor signal, the sunlight sensor signal, the position feedback signal of the left air damper motor, the position feedback signal of the right air damper motor, the position feedback signal of the mode air damper motor, the position feedback signal of the internal and external circulation air damper motor, and the position feedback signal of the defrost air damper motor are respectively connected to the S0 - S7 pins of the second switch chip. The control pin A0 of the first switch chip is connected to the control pin A0 of the second switch chip, the control pin A1 of the first switch chip is connected to the control pin A1 of the second switch chip, and the control pin A2 of the first switch chip is connected to the control pin A2 of the second switch chip, and they are respectively connected to 3 GPIO control pins of the MCU. The output pin D of the first switch chip is connected to the positive input +IN of the first operational amplifier. The negative input -IN of the first operational amplifier is connected to the output OUT to form a voltage follower to output signal A, and it is connected to one end of the ninth resistor R9. The other end of the ninth resistor R9 is connected to one end of the tenth resistor R10 and the fourth capacitor C4 to form a voltage division and filtering function signal B, and it is connected to the ADC input pin of the MCU. The other ends of the tenth resistor R10 and the fourth capacitor C4 are connected to the ground. The output pin D of the second switch chip is connected to the positive input +IN of the second operational amplifier. The negative input -IN of the second operational amplifier is connected to the output OUT to form a voltage follower to output signal C, and it is connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and the fifth capacitor C5 to form a voltage division and filtering function signal D, and it is connected to the ADC input pin of the MCU. The other ends of the twelfth resistor R12 and the fifth capacitor C5 are connected to the ground;

[0021] Further improvement: The first switch chip and the second switch chip serve as channel switching function chips, and are characterized in that: The MCU controls the A0 - A2 level signals through GPIO, and respectively performs channel switching through the first switch chip and the second switch chip, and can time-division switch the 8-channel sensor inputs, and respectively input them to the first operational amplifier and the second operational amplifier through the output pin D, which can effectively reduce the requirements for the number of MCU pins and has great advantages in the selection and cost of the MCU;

[0022] For further improvement, the external sensor and the air damper motor are characterized in that: the supply voltage AVCC of the external sensor and the air damper motor is 5V, and the supply voltage of the MCU is 3.3V. Through the first operational amplifier, the second operational amplifier and the voltage division and filtering circuit, the 5V range of the supply voltage of the external sensor and the air damper motor can be converted into a 3.3V range. By using pull-up resistors with different resistance values connected to the supply voltage AVCC, where the ninth resistor R9 and the eleventh resistor R11 are selected with a resistance value of 5.11KΩ, and the tenth resistor R10 and the twelfth resistor R12 are selected with a resistance value of 10KΩ. Through the first operational amplifier and the second operational amplifier circuit, the feedback signals of the external sensor and the air damper motor are isolated and matched with the voltage division and filtering circuit, avoiding mutual influence between the external input circuit and the voltage division and filtering circuit.

[0023] With the above solution, the present invention can be applied to traditional fuel vehicles and new energy vehicle models. The system integrates multiple functions of the air-conditioning blower system, and through vehicle verification, simplifies the architecture of the air-conditioning blower system and the wiring harness layout, reduces the energy consumption of the air-conditioning blower, and lowers the cost of the air-conditioning blower system, which has great significance for promoting the process of vehicle electrification and intelligentization. Description of the Drawings

[0024] The drawings of the present invention are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the present invention to supplement the description in the specification. However, the drawings of the present invention are schematic diagrams not drawn to scale and may not be able to accurately reflect the precise structure or performance characteristics of any given embodiment. The drawings of the present invention should not be construed as limiting or restricting the scope of the numerical values or properties covered by the exemplary embodiments of the present invention. The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0025] Figure 1 It is a schematic application diagram of an integrated vehicle-mounted blower control system of the present invention.

[0026] Figure 2 It is a schematic structural diagram of an integrated vehicle-mounted blower control system of the present invention.

[0027] Figure 3 It is a schematic diagram of a preferred embodiment of the BLDC motor drive module of the present invention.

[0028] Figure 4 It is a schematic diagram of a preferred embodiment of the BDC drive module of the present invention.

[0029] Figure 5 It is a schematic diagram of a preferred embodiment of the analog signal input module of the present invention. Detailed Embodiments

[0030] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation manners. The details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without departing from the overall design concept of the invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited only to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention complete and thorough, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art. It should be understood that when an element is referred to as "connected" or "coupled" to another element, the element can be directly connected or coupled to the other element, or there can be an intermediate element. In contrast, when an element is referred to as "directly connected" or "directly coupled" to another element, there is no intermediate element. In all the drawings, the same reference numerals always represent the same elements.

[0031] Embodiment

[0032] The present invention provides an integrated vehicle-mounted blower control system, including:

[0033] An MCU, which is used to identify the on / off (ON / OFF) information of the vehicle air-conditioning button switch, identify and control the closed-loop speed control of the brushless motor and the damper angle mode control of the damper motor, collect and process external sensor data and the damper motor position feedback signal, control the driving of the PM2.5 sensor and the negative ion generator, and can realize the driving control of the seat heating and the compressor control valve through the low-side driving module;

[0034] A power supply module, which includes two independent power supplies, and outputs corresponding voltages according to the selected power supply chip type to supply power to other modules and circuits of the system and provide diagnostic protection functions;

[0035] A BLDC motor driving module, which includes a three-phase pre-driver chip, MOSFET switches, and current sampling. The MOSFET switches are driven by the pre-driver chip, and the motor driving current is collected through double-resistance current sampling. It can realize the sensorless brushless motor FOC closed-loop control and collect the three-phase back electromotive force;

[0036] A BDC driving module, which combines two-channel half-bridges into a full-bridge driving mode through a multi-channel integrated intelligent half-bridge driving chip, can realize the control of the damper motor driving, and can control the driving of the PM2.5 sensor and the negative ion generator by setting a single half-bridge driving to the high-side driving mode;

[0037] Low-side drive module. The low-side drive module can achieve low-side drive control of the seat heating relay switch and the compressor control valve through a multi-channel integrated intelligent low-side drive chip.

[0038] Analog signal input module. The analog signal input module is used to collect external sensor signals and the position feedback signal of the air door motor.

[0039] Digital signal input module. The digital signal input module is used for identifying the air-conditioning switch button signal and collecting and processing the feedback signals of the AQS air quality sensor and the PM2.5 sensor.

[0040] CAN communication module. The CAN communication module includes a high-speed CAN transceiver, which is used to connect to the in-vehicle CAN network to achieve in-vehicle information interaction and can also achieve XCP calibration.

[0041] EEPROM data storage module. The EEPROM data storage module writes calibration information and logistics data information through the MCU.

[0042] To further illustrate the present invention, the following feasible embodiments of implementing the intelligent driving domain controller of the present invention using existing hardware devices (chips, interfaces, communication lines, etc.) are provided. It should be clear that: the following embodiments are a preferred solution for implementing the present invention using existing technologies and should not be construed as a limitation on the hardware devices used in the present invention. Under the condition of providing the same or similar functions, other existing hardware can also implement the solution of the present invention.

[0043] Reference Figure 1 As shown, the integrated in-vehicle blower control system is powered by the battery KL30, can identify the on / off (ON / OFF) information of the vehicle air-conditioning button switch, can drive the brushless motor and achieve speed closed-loop control, can achieve the opening and closing angle control of five air doors including the left temperature air door motor, the right temperature air door motor, the mode air door motor, the internal and external circulation air door motor, and the defrosting air door motor, can collect and process the data of multiple sensors of the air-conditioning blower system such as the in-vehicle condensation inlet and outlet temperature sensors, the front left and front right foot-blowing temperature sensors, the front left and front right face-blowing temperature sensors, the evaporator temperature sensor, the pressure sensor, the sunlight sensor, and the AQS air quality sensor data, can control the left and right seat heating relay switches, the compressor control valve drive, the PM2.5 sensor and the negative ion generator drive, and can perform network communication with other vehicle ECUs through the LIN or CAN communication bus integrated in the power supply module.

[0044] Reference Figure 2 Combined with Figure 1As shown in the figure, the present invention provides an integrated vehicle blower control system, including: an MCU as the control core of the vehicle blower control system, a power supply module, a BLDC motor drive module, a BDC drive module, a low-side drive module, an analog signal input module, a digital signal input module, a CAN communication module, and an EEPROM data storage module.

[0045] The MCU recognizes the on / off information of the vehicle air-conditioning button switch through the digital signal input module to execute the on / off function of the blower. It receives and sends the required vehicle information and diagnostic service functions through the LIN or CAN communication module integrated in the power supply module. It can achieve closed-loop control of the blower speed by controlling the brushless motor through the BLDC motor drive module, and supports motor stall, overcurrent, open circuit, and short-circuit diagnosis. It can drive and control the left temperature air door motor, right temperature air door motor, mode air door motor, internal and external circulation air door motor, and defrost air door motor, as well as drive and control the PM2.5 sensor and negative ion generator through the BDC drive module, and supports overcurrent, open circuit, and short-circuit diagnosis. It can drive and control the left and right seat heaters and the compressor control valve through the low-side drive module, and supports overcurrent and open circuit diagnosis. It collects and monitors the ADC values of the in-vehicle condensation inlet and outlet temperature sensors, front left and right foot-blowing temperature sensors, front left and right face-blowing temperature sensors, evaporator temperature sensor, pressure sensor, sunlight sensor, AQS air quality sensor, in-vehicle temperature sensor, and the position feedback ADC signals of the left air door motor, right air door motor, mode air door motor, internal and external circulation air door motor, and defrost air door motor through the analog signal input module, and compares them with the set software diagnosis threshold values. In this embodiment, the MCU is the 64-pin M0G3507QPMRQ1 of TI. This MCU has a high resource utilization rate in this system and has a cost advantage. The recommended performance parameters of the MCU are: FLASH: 128 kByte; ADC: 16 channels / 2 Modules; LIN and CAN: 1 channel and above; SPI: 2 channels and above.

[0046] The power supply module includes a SBC power supply and an LDO power supply. The SBC power supply can output a 3.3V voltage for the MCU power supply and the LIN transceiver. The LDO power supply includes an output of 5V voltage and an AVCC output by the voltage follower. The 5V voltage is used as the reference voltage AVCC of the voltage follower and for the internal logic circuit and the CAN transceiver power supply. The AVCC voltage is used for external sensor power supply and supports the diagnostic protection functions of AVCC short-circuited to ground and short-circuited to KL30.

[0047] Reference Figure 3 Combined with Figure 2As shown, the BLDC motor drive module includes a three-phase pre-driver chip, the first to sixth MOSFET switches Q1 to Q6, a sampling resistor, the first resistor R1 and the second resistor R2. The first terminal 1 of the first MOSFET switch Q1 is connected to the GHA pin of the pre-driver chip. The first terminal 1 of the second MOSFET switch Q2 is connected to the GHB pin of the pre-driver chip. The first terminal 1 of the third MOSFET switch Q3 is connected to the GHC pin of the pre-driver chip. The second terminals 2 of the first to third MOSFET switches Q1 to Q3 are commonly connected to the KL30 power supply terminal. The first terminal 1 of the fourth MOSFET switch Q4 is connected to the GLA pin of the pre-driver chip, and the third terminal 3 is connected to one end of the sampling resistor, the first resistor R1, and is simultaneously connected to the positive input SPA pin of the differential current sampling A module of the pre-driver chip. The other end of the sampling resistor, the first resistor R1, is connected to the negative input SNA pin of the differential current sampling A module of the pre-driver chip and is connected to ground. The first terminal 1 of the fifth MOSFET switch Q5 is connected to the GLB pin of the pre-driver chip, and the third terminal 3 is connected to one end of the sampling resistor, the second resistor R2, and is simultaneously connected to the positive input SPB pin of the differential current sampling B module of the pre-driver chip. The other end of the sampling resistor, the second resistor R2, is connected to the negative input SNB pin of the differential current sampling B module of the pre-driver chip and is connected to ground. The first terminal 1 of the sixth MOSFET switch Q6 is connected to the GLC pin of the pre-driver chip, and the third terminal 3 is connected to ground. The third terminal of the first MOSFET switch Q1 is connected to the second terminal of the fourth MOSFET switch Q4 to form a drive terminal U, which is connected to the U phase of the external brushless motor. The third terminal of the second MOSFET switch Q2 is connected to the second terminal of the fifth MOSFET switch Q5 to form a drive terminal V, which is connected to the V phase of the external brushless motor. The third terminal of the third MOSFET switch Q3 is connected to the second terminal of the sixth MOSFET switch Q6 to form a drive terminal W, which is connected to the W phase of the external brushless motor. One end of the third resistor R3 is connected to the drive terminal U, and the other end is connected to one end of the fourth resistor R4 and one end of the first capacitor C1 and is commonly connected to the ADC input pin of the MCU. The other ends of the fourth resistor R4 and the first capacitor C1 are connected to ground. By resistor voltage division, the back electromotive force of the U phase can be collected. One end of the fifth resistor R5 is connected to the drive terminal V, and the other end is connected to one end of the sixth resistor R6 and one end of the second capacitor C2 and is commonly connected to the ADC input pin of the MCU. The other ends of the sixth resistor R6 and the second capacitor C2 are connected to ground. By resistor voltage division, the back electromotive force of the V phase can be collected. One end of the seventh resistor R7 is connected to the drive terminal W, and the other end is connected to one end of the eighth resistor R8 and one end of the third capacitor C3 and is commonly connected to the ADC input pin of the MCU. The other ends of the eighth resistor R8 and the third capacitor C3 are connected to ground. By resistor voltage division, the back electromotive force of the W phase can be collected. The MOSFET switches are driven by the pre-driver chip, and the motor drive current is sampled by dual-resistor current sampling.It can achieve sensorless and brushless motor FOC closed-loop control. By collecting the three-phase back electromotive force through the MCU, it can identify whether the brushless motor has stopped braking.

[0048] Reference Figure 4 Combined with Figure 2 As shown, the BDC drive module includes an intelligent half-bridge drive chip. This chip has built-in MOSFET switches and has 12-channel half-bridge drive outputs. Combining two channels of half-bridges into a full-bridge drive mode can control the left temperature air door motor, right temperature air door motor, mode air door motor, internal and external circulation air door motor, and defrost air door motor drive. Setting a single-channel half-bridge drive to a high-side drive mode can control the PM2.5 sensor and negative ion generator drive control;

[0049] The low-side drive module can achieve low-side drive control of the seat heating relay switch and compressor control valve through a multi-channel integrated intelligent low-side drive chip. It has built-in integrated MOSFET switches and diagnostic protection circuits, can control the relay to be in the normally open or normally closed mode, and can also control the relay to be in the PWM switch mode through SPI communication;

[0050] Reference Figure 5 Combined with Figure 2As shown in the figure, the analog signal input module collects the external sensor signals and the position feedback signals of the air damper motors. The external sensor signals and the position feedback signals of the air damper motors are respectively connected to one end of resistors with different resistances, and the other end of the resistor is connected to the AVCC voltage. The external sensor signals and the position feedback signals of the air damper motors respectively pass through the RC filter circuits and are input to the switch chips. Among them, the signals of the front left face blowing temperature sensor, the front right face blowing temperature sensor, the front left foot blowing temperature sensor, the front right foot blowing temperature sensor, the in-vehicle condensation inlet temperature sensor, the in-vehicle condensation outlet temperature sensor, the evaporator temperature sensor, and the AQS air quality sensor are respectively connected to the S0 - S7 pins of the first switch chip. The pressure sensor signal, the in-vehicle temperature sensor signal, the sunlight sensor signal, the left air damper motor position feedback signal, the right air damper motor position feedback signal, the mode air damper motor position feedback signal, the internal and external circulation air damper motor position feedback signal, and the defrost air damper motor position feedback signal are respectively connected to the S0 - S7 pins of the second switch chip. The control pin A0 of the first switch chip is connected to the control pin A0 of the second switch chip, the control pin A1 of the first switch chip is connected to the control pin A1 of the second switch chip, and the control pin A2 of the first switch chip is connected to the control pin A2 of the second switch chip, and they are respectively connected to 3 GPIO control pins of the MCU. The output pin D of the first switch chip is connected to the positive input +IN of the first operational amplifier. The negative input -IN of the first operational amplifier is connected to the output OUT to form a voltage follower function to output signal A, and it is connected to one end of the ninth resistor R9. The other end of the ninth resistor R9 is connected to one end of the tenth resistor R10 and the fourth capacitor C4 to form a voltage division and filtering function signal B, and it is connected to the ADC input pin of the MCU. The other ends of the tenth resistor R10 and the fourth capacitor C4 are connected to the ground. The output pin D of the second switch chip is connected to the positive input +IN of the second operational amplifier. The negative input -IN of the second operational amplifier is connected to the output OUT to form a voltage follower function to output signal C, and it is connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and the fifth capacitor C5 to form a voltage division and filtering function signal D, and it is connected to the ADC input pin of the MCU. The other ends of the twelfth resistor R12 and the fifth capacitor C5 are connected to the ground;

[0051] Reference Figure 5 Combined with Figure 2 As shown in the figure, the first switch chip and the second switch chip are used as channel switching function chips. The MCU controls the A0 - A2 level signals through GPIO, and respectively performs channel switching through the first switch chip and the second switch chip, and can switch the 8 - channel sensor inputs in a time - sharing manner, and are respectively input to the first operational amplifier and the second operational amplifier through the output pin D, which can effectively reduce the requirements for the number of MCU pins and has great advantages in the selection and cost of the MCU;

[0052] Reference Figure 5 Combined Figure 2 As shown, the supply voltage AVCC of the external sensor and the damper motor is 5V. The MCU used in this embodiment, M0G3507QPMRQ1, is powered by 3.3V. Through the first operational amplifier, the second operational amplifier, and the voltage division and filtering circuit, the 5V range of the supply voltage of the external sensor and the damper motor can be converted into a 3.3V range. In this embodiment, the ninth resistor R9 and the eleventh resistor R11 are selected with a resistance value of 5.11KΩ, and the tenth resistor R10 and the twelfth resistor R12 are selected with a resistance value of 10KΩ;

[0053] Due to the different characteristics of various external sensors and damper motors, pull-up resistors with different resistance values need to be connected to the supply voltage AVCC. Through the first operational amplifier and the second operational amplifier circuit, the feedback signals of the external sensors and the damper motor are isolated and matched with the voltage division and filtering circuit to avoid mutual influence between the external input circuit and the voltage division and filtering circuit.

[0054] The digital signal input module can collect switch signals that are valid for low level or high level, and input them to the MCU for identification through the RC filtering circuit. It can also collect PWM frequency signals and identify the signal frequency and duty cycle of PWM.

[0055] The CAN communication module includes a high-speed CAN transceiver for connecting to the in-vehicle CAN network;

[0056] The EEPROM data storage module writes calibration information and logistics data information through the MCU.

[0057] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will also be understood that terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0058] The above has described the present invention in detail through specific embodiments and examples, but these do not constitute a limitation to the present invention. Without departing from the principle of the present invention, those skilled in the art can also make many modifications and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. An integrated vehicle-mounted blower control system, characterized in that: include: MCU, the MCU is used to identify the on / off information of the vehicle air conditioning key switch, identify and control the brushless motor speed closed-loop control and the damper motor damper angle mode control, collect and process external sensor data and damper motor position feedback signals, control the PM2.5 sensor and negative ion generator drive, and realize seat heating and compressor control valve drive control through the low-side driver module; A power module, which includes two independent power supplies, which output corresponding voltages according to the selected power chip type to power other modules and circuits of the system and provide diagnostic protection functions; The BLDC motor drive module includes a three-phase pre-drive chip, a MOSFET switch, and current sampling. The MOSFET switch is driven by the pre-drive chip, and the motor drive current is collected by dual-resistance current sampling, so that the FOC closed-loop control of the sensorless brushless motor can be realized, and the three-phase reverse electromotive force can be collected; BDC drive module, which combines two-channel half-bridges into a full-bridge drive mode through a multi-channel integrated intelligent half-bridge drive chip, can control the damper motor drive, and sets a single half-bridge drive to a high-side drive mode, which can control the PM2.5 sensor and negative ion generator drive; A low-side driver module, which can realize low-side drive control of seat heating relay switch and compressor control valve through multi-channel integrated intelligent low-side driver chip; An analog signal input module, wherein the analog signal input module is used to collect external sensor signals and damper motor position feedback signals; A digital signal input module, which is used for air conditioner switch button signal recognition and AQS air quality sensor and PM2.5 sensor feedback signal collection and processing; CAN communication module, the CAN communication module includes a high-speed CAN transceiver, which is used to connect to the vehicle-mounted CAN network to realize in-vehicle information interaction and can realize XCP calibration; An EEPROM data storage module is used to write calibration information and logistics data information into the EEPROM data storage module through the MCU.

2. The MCU according to claim 1, wherein: The on / off information of the vehicle air-conditioning button switch is identified through the digital signal input module to execute the on / off blower function, the required vehicle information and diagnostic service functions are received and sent through the LIN or CAN communication module integrated in the power module, and the ADC values ​​of the condensation inlet and outlet temperature sensors, front left and right foot temperature sensors, front left and right face temperature sensors, evaporator temperature sensors, pressure sensors, sunlight sensors, AQS air quality sensors, and vehicle temperature sensors, as well as the positions of the left damper motor, right damper motor, mode damper motor, internal and external circulation damper motor, and defrost damper motor, are collected and monitored through the analog signal input module. The ADC signal is fed back and compared with the set software diagnostic threshold. The BLDC motor driver module can control the brushless motor to achieve closed-loop control of the blower speed, and supports motor stall, overcurrent, open circuit and short circuit diagnosis. The BDC driver module can realize drive control of the left temperature flap motor, right temperature flap motor, mode flap motor, internal and external circulation flap motor and defrost flap motor, PM2.5 sensor and negative ion generator, and support overcurrent, open circuit and short circuit diagnosis. The low-side driver module can realize left and right seat heating and compressor control valve drive control, and support overcurrent and open circuit diagnosis. The EEPROM data storage module can realize system data and logistics data storage.

3. The power module according to claim 1, wherein: It includes one SBC power supply and one LDO power supply. The SBC power supply can output 3.3V voltage according to the power chip, which is used for MCU power supply and has a built-in LIN transceiver. The LDO power supply can output 5V voltage and voltage follower output AVCC according to the power chip. The 5V voltage is used as the reference voltage AVCC of the voltage follower, and is used for internal logic circuits and CAN transceiver power supply. The AVCC voltage is used to power external sensors and can support AVCC short-circuit to ground and short-circuit to KL30 diagnostic protection functions.

4. The BLDC motor drive module according to claim 1, wherein: The invention comprises a three-phase pre-driver chip and first to sixth MOSFET switch tubes Q1 to Q6, a first sampling resistor R1 and a second sampling resistor R2, wherein a first end 1 of the first MOSFET switch tube Q1 is connected to a GHA pin of the pre-driver chip, a first end 1 of the second MOSFET switch tube Q2 is connected to a GHB pin of the pre-driver chip, a first end 1 of the third MOSFET switch tube Q3 is connected to a GHC pin of the pre-driver chip, second ends 2 of the first to third MOSFET switch tubes Q1 to Q3 are commonly connected to a KL30 power supply terminal, a first end 1 of the fourth MOSFET switch tube Q4 is connected to a GLA pin of the pre-driver chip, a third end 3 is connected to one end of the sampling resistor first resistor R1 and is simultaneously connected to a differential current sampling terminal of the pre-driver chip. The first end 1 of the fifth MOSFET switch tube Q5 is connected to the GLB pin of the pre-driver chip, and the third end 3 is connected to one end of the sampling resistor second resistor R2 and connected to the positive input SPB pin of the pre-driver chip differential current sampling B module. The other end of the sampling resistor second resistor R2 is connected to the negative input SNB pin of the pre-driver chip differential current sampling B module and connected to the ground. The first end 1 of the sixth MOSFET switch tube Q6 is connected to the GLC pin of the pre-driver chip, and the third end 3 is connected to the ground. The third end of the first MOSFET switch tube Q1 is connected to the fourth MOSFET The second end of the switch tube Q4 forms a driving end U, which is connected to the U phase of the external brushless motor. The third end of the second MOSFET switch tube Q2 is connected to the second end of the fifth MOSFET switch tube Q5 to form a driving end V, which is connected to the V phase of the external brushless motor. The third end of the third MOSFET switch tube Q3 is connected to the second end of the sixth MOSFET switch tube Q6 to form a driving end W, which is connected to the W phase of the external brushless motor. One end of the third resistor R3 is connected to the driving end U, and the other end is connected to one end of the fourth resistor R4 and one end of the first capacitor C1 and are connected to the ADC input pin of the MCU. The other ends of the fourth resistor R4 and the first capacitor C1 are connected to the ground. The reverse electromotive force of the U phase can be collected through the resistor voltage division. The fifth resistor R5 One end of is connected to the driving terminal V, and the other end is connected to one end of the sixth resistor R6 and one end of the second capacitor C2 and are connected to the ADC input pin of the MCU. The other ends of the sixth resistor R6 and the second capacitor C2 are connected to the ground. Through the resistor voltage division, the reverse electromotive force of the V phase can be collected. One end of the seventh resistor R7 is connected to the driving terminal W, and the other end is connected to one end of the eighth resistor R8 and one end of the third capacitor C3 and are connected to the ADC input pin of the MCU. The other ends of the eighth resistor R8 and the third capacitor C3 are connected to the ground. Through the resistor voltage division, the reverse electromotive force of the W phase can be collected. The MOSFET switch is driven by the pre-driver chip, and the motor driving current is collected by dual-resistance current sampling, so as to realize the FOC closed-loop control of the inductive brushless motor.By collecting the three-phase reverse electromotive force through MCU, it can be identified whether the brushless motor has stopped.

5. The BDC driver module according to claim 1, characterized in that: It includes an intelligent half-bridge driver chip with a built-in MOSFET switch tube and 12-channel half-bridge drive output. It combines two-channel half-bridges into a full-bridge drive mode, which can control the left temperature damper motor, right temperature damper motor, mode damper motor, internal and external circulation damper motor and defrost damper motor drive. Setting a single-channel half-bridge drive to high-side drive mode can control the PM2.5 sensor and negative ion generator drive control.

6. The analog signal input module according to claim 1, characterized in that: The external sensor signal and the damper motor position feedback signal are collected, and the external sensor signal and the damper motor position feedback signal are respectively connected to one end of a resistor with different resistance values, and the other end of the resistor is connected to the AVCC voltage. The external sensor signal and the damper motor position feedback signal are respectively input into the switch chip through the RC filtering circuit, wherein the front left face temperature sensor signal, the front right face temperature sensor signal, the front left foot temperature sensor signal, the front right foot temperature sensor signal, the in-vehicle condensation inlet temperature sensor signal, the in-vehicle condensation outlet temperature sensor signal, the evaporator temperature sensor signal, and the AQS air quality sensor signal are respectively connected to the S0-S7 pins of the first switch chip, and the pressure sensor signal, the in-vehicle temperature sensor signal, the sunlight sensor signal, the left damper motor position feedback signal, the right damper motor position feedback signal, the mode damper motor position feedback signal, the internal and external circulation damper motor position feedback signal, and the defrost damper motor position feedback signal are respectively connected to the S0-S7 pins of the second switch chip, and the control pin A0 of the first switch chip is connected to the control pin A0 of the second switch chip, and the control pin A1 of the first switch chip is connected to the control pin A1 of the first switch chip. The control pin A1 of the second switch chip and the control pin A2 of the first switch chip are connected to the control pin A2 of the second switch chip, and are respectively connected to the three GPIO control pins of the MCU. The output pin D of the first switch chip is connected to the positive input +IN of the first operational amplifier, and the negative input -IN of the first operational amplifier is connected to the output OUT to form a voltage follower function output signal A, and is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to the tenth resistor R10 and one end of the fourth capacitor C4 to form a voltage divider filter function signal B, and is connected to the ADC input pin of the MCU, and the other ends of the tenth resistor R10 and the fourth capacitor C4 are connected to the ground, the output pin D of the second switch chip is connected to the positive input +IN of the second operational amplifier, and the negative input -IN of the second operational amplifier is connected to the output OUT to form a voltage follower function output signal C, and is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the twelfth resistor R12 and one end of the fifth capacitor C5 to form a voltage divider filter function signal D, and is connected to the ADC input pin of the MCU, and the other ends of the twelfth resistor R12 and the fifth capacitor C5 are connected to the ground.

7. The first switch chip and the second switch chip as claimed in claim 6 are used as a channel switching function chip, characterized in that: The MCU controls the A0~A2 level signals through GPIO, and switches channels through the first switch chip and the second switch chip respectively. The 8-channel sensor inputs can be switched in time-sharing manner and input to the first operational amplifier and the second operational amplifier through the output pin D respectively, which can effectively reduce the requirement on the number of MCU pins and has great advantages in the selection and cost of MCU.

8. The external sensor and damper motor according to claim 6, characterized in that: The external sensor and the damper motor power supply voltage AVCC are both powered by 5V, and the MCU is powered by 3.3V. The 5V range of the external sensor and the damper motor power supply voltage can be converted into a 3.3V range through the first operational amplifier and the second operational amplifier and the voltage divider filter circuit, and connected to the power supply voltage AVCC by using pull-up resistors with different resistance values, wherein the ninth resistor R9 and the eleventh resistor R11 use a resistance value of 5.11KΩ, and the tenth resistor R10 and the twelfth resistor R12 use a resistance value of 10KΩ. The first operational amplifier and the second operational amplifier circuit are used to isolate and match the external sensor and damper motor feedback signal with the voltage divider filter circuit to avoid mutual influence between the external input circuit and the voltage divider filter circuit.

Images