Automobile seat control circuit

Abstract

The utility model relates to an automobile seat control circuit, which is characterized by comprising a main control circuit connected to a key driving circuit; the Hall signal acquisition circuit is connected; the controlled end of each H-bridge driving circuit is connected to the main control circuit, and the load connecting end of each H-bridge driving circuit is connected to a motor, an air pump and a heating circuit of the automobile seat; the controlled end of the electromagnetic valve driving circuit is connected to the main control circuit, the control end of the electromagnetic valve driving circuit is connected to an electromagnetic valve of an automobile seat, and the electromagnetic valve is used for controlling on-off of a pipeline of the air pipe assembly; and the SBC chip is connected to the control circuit and is used for providing a power supply, can communication connection and lin communication connection for the control circuit. The automobile seat control circuit is convenient for troubleshooting and function upgrading after a massage system breaks down, and the integration level of the automobile seat control circuit is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of automobile parts, and more specifically relates to an automobile seat control circuit. Background Art

[0002] Electric car seats typically include multiple motors for adjusting the seat's height, fore and aft, and the backrest's inclination, as well as a heating circuit for heating the seat. Some seats also have a ventilation function, with a blower installed on the seat to achieve ventilation. With the development of technology, car seats with massage functions have also become popular. This type of car seat not only has multiple motors for adjusting the seat's height, fore and aft, and inclination, but also includes a massage system for massaging passengers. The massage system includes a lumbar support airbag assembly and a massage airbag assembly. Both the lumbar support airbag assembly and the massage airbag assembly are connected to the air pump through an air pipe assembly. A solenoid valve is installed in the air pipe channel of the air pipe assembly to control the on-off of the air circuit.

[0003] For car seats with massage functions, the seat controller is used to implement the adjustment and position memory functions of each seat motor and control the heating circuit. The massage controller is used to control the operation of the massage system installed on the car seat. The massage controller uses LIN communication, and the seat controller is required to forward the control instructions of the massage system. As a result, after a massage system malfunctions, it is difficult to troubleshoot and cannot perform function upgrades. In addition, because different controllers are used to control the motor and the massage system, the integration level of the car seat control circuit is low. Utility Model Content

[0004] In order to solve the technical problems that the existing car seat massage system is difficult to troubleshoot and cannot be upgraded after a fault occurs, and the problem of low integration of the car seat control circuit, the present invention provides solutions in the following aspects.

[0005] In a first aspect, the present invention provides a car seat control circuit, comprising:

[0006] The main control circuit is connected to the key drive circuit to detect the status of each key on the car seat and control the car seat accordingly based on the status of each key; it is connected to the Hall signal acquisition circuit to collect the Hall signal of the motor of the car seat to obtain the motor operation status;

[0007] Multiple H-bridge drive circuits, with the controlled end of each H-bridge drive circuit connected to the main control circuit, and the load connection end of each H-bridge drive circuit respectively connected to the motor, air pump and heating circuit of the car seat, for driving the motor, air pump and heating circuit according to the instructions of the main control circuit;

[0008] The motor is used to adjust the posture of the seat, the air pump is used to control the inflation and deflation of the lumbar support air bag assembly and the massage air bag assembly of the car seat through the air pipe assembly, and the heating circuit is used to heat the seat; each button is used to send control signals of the motor, air pump, solenoid valve and heating circuit of the car seat to the main control circuit;

[0009] A solenoid valve drive circuit, wherein a controlled end thereof is connected to a main control circuit, and a control end thereof is connected to a solenoid valve of a car seat, wherein the solenoid valve is used to control the on-off of the pipeline of the air pipe assembly;

[0010] An SBC chip is connected to the control circuit and is used to provide power, CAN communication connection and LIN communication connection for the control circuit.

[0011] In one embodiment, the key driving circuit includes:

[0012] A voltage dividing branch, one end of which is connected to a first power supply voltage and the other end is grounded via a first control switch. A voltage dividing point of the voltage dividing branch is connected in series with a push button switch and a first grounding resistor and then to ground. The voltage dividing branch is also connected to an IO pin of the main control circuit via a sixth current-limiting resistor. A controlled end of the first control switch is connected to the IO pin of the main control circuit via the first current-limiting resistor.

[0013] The wake-up signal generating circuit is connected in series between the voltage dividing point and the IO pin of the SBC chip, and is used to send a high-level signal to the main control circuit through the SBC chip to wake up the main control circuit when the voltage dividing point is at a low potential.

[0014] In one embodiment, the wake-up signal generating circuit includes a second control switch, one end of the second control switch is connected to a second supply voltage, the other end is grounded through a second grounding resistor, and is connected to an IO pin of the SBC chip, and the controlled end of the second control switch is connected to the voltage dividing point through a first resistor. When the voltage dividing point is at a low potential, the second control switch is turned on.

[0015] In one embodiment, the H-bridge drive circuit includes a first branch and a second branch connected in parallel, the first branch includes a third control switch and a fourth control switch connected in series, the second branch includes a fifth control switch and a sixth control switch connected in series, the connection point between the third control switch and the fourth control switch and the connection point between the fifth control switch and the sixth control switch are used to connect a load to power the load, and an RC series circuit is connected in parallel at both ends of the third control switch, the fourth control switch, the fifth control switch and the sixth control switch; the controlled ends of the third control switch, the fourth control switch, the fifth control switch and the sixth control switch are respectively connected to the IO pins of the pre-driver chip; the first end of the first branch is grounded, and the second end is connected to a third power supply voltage.

[0016] In one embodiment, the first end of the first branch is grounded via a sampling resistor, and both ends of the sampling resistor are respectively connected to IO pins of the main control circuit to collect the voltage of the H-bridge driving circuit when it is working.

[0017] In one embodiment, the solenoid valve drive circuit includes a seventh control switch, one end of which is connected in series with the coil of the solenoid valve and then connected to the fourth power supply voltage, the other end of which is grounded, and the controlled end of which is connected to the IO pin of the main control circuit through a second current limiting resistor.

[0018] In one embodiment, a freewheeling diode is connected in parallel at both ends of the coil of the solenoid valve.

[0019] In one embodiment, the Hall signal acquisition circuit includes an operational amplifier, the power supply terminal and the inverting input terminal of the operational amplifier are connected to the Hall signal receiving terminal, the ground terminal is grounded, the non-inverting input terminal is connected to the Hall signal receiving terminal through a current limiting branch, the output terminal is connected to the fifth power supply voltage through a pull-up resistor, and is connected to the IO pin of the main control circuit through a third current limiting resistor. The Hall signal receiving terminal is used to connect to the Hall element provided on the motor of the car seat.

[0020] In one embodiment, a first filter circuit is connected in series between the Hall signal receiving terminal and the ground, and a second filter circuit is connected in series between the non-inverting input terminal and the ground.

[0021] In one embodiment, a ventilation drive circuit is further included, which includes a second resistor and an eighth control switch. One end of the second resistor is connected to the first power supply voltage, and the other end is connected to the power supply end of the fan, and is grounded through a voltage sampling branch and grounded through the eighth control switch. The controlled end of the eighth control switch is connected to the IO pin of the main control circuit through a fourth current limiting resistor.

[0022] The beneficial effects of the present invention are as follows: existing car seats use a seat controller to implement the adjustment and position memory functions of each seat motor, and a massage controller to control the massage system installed on the car seat. The massage controller uses LIN communication, and the seat controller is required to forward control instructions for the massage system. As a result, after a massage system malfunctions, it is difficult to troubleshoot and upgrade the function. The car seat control circuit of the present invention no longer uses two controllers to control the operation of the massage system and other components on the car seat separately. Instead, it uses a single main control circuit to send control instructions to the massage system and motors on the car seat, thereby facilitating troubleshooting and function upgrades after a massage system malfunctions and improving the integration of the car seat control circuit. In addition, the main control circuit communicates with other terminals via both CAN communication and LIN communication, ensuring the stability and reliability of the communication connection.

[0023] Furthermore, by providing a ventilation drive circuit and connecting the ventilation drive circuit to the main control circuit, the seat fan can be controlled, thereby further improving the integration of the car seat control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of a car seat control circuit according to an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the key drive circuit structure of an embodiment of the utility model;

[0027] Figure 3 Schematic diagram of the structure of a wake-up signal generating circuit according to an embodiment of the present invention;

[0028] Figure 4 1 is a schematic diagram of the H-bridge drive circuit structure of an embodiment of the present utility model;

[0029] Figure 5 This is a schematic diagram of the solenoid valve drive circuit structure of an embodiment of the present utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the Hall signal acquisition circuit of an embodiment of the present utility model;

[0031] Figure 7 This is a schematic diagram of the ventilation drive circuit structure of an embodiment of the present utility model;

[0032] Figure 8 It is a schematic diagram of the main control circuit structure of an embodiment of the present utility model. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The specific implementation of the present utility model will be described in detail below with reference to the accompanying drawings.

[0035] Car seat control circuit example:

[0036] like Figure 1 As shown, the automobile seat control circuit of the present invention includes: a main control circuit connected to a key drive circuit to detect the status of each key on the automobile seat and control the automobile seat accordingly according to the status of each key; connected to a Hall signal acquisition circuit for acquiring Hall signals from the motor of the automobile seat to obtain the operating status of the motor; multiple H-bridge drive circuits, each of which has a controlled end connected to the main control circuit, and a load connection end of each H-bridge drive circuit respectively connected to the motor, air pump and heating circuit of the automobile seat, for driving the motor, air pump and heating circuit according to the instructions of the main control circuit;

[0037] The motor is used to adjust the seat's posture, the air pump is used to control the inflation and deflation of the car seat's lumbar support airbag assembly and massage airbag assembly through the air pipe assembly, and the heating circuit is used to heat the seat. Each button is used to send control signals to the main control circuit for the car seat's motor, air pump, solenoid valve, and heating circuit.

[0038] A solenoid valve drive circuit, wherein the controlled end thereof is connected to the main control circuit, and the control end thereof is connected to the solenoid valve of the car seat, and the solenoid valve is used to control the on-off of the pipeline of the air pipe assembly;

[0039] The SBC chip is connected to the control circuit and is used to provide power, CAN communication connection and LIN communication connection for the control circuit.

[0040] The multiple H-bridge driving circuits include a first H-bridge driving circuit, a second H-bridge driving circuit, ... an nth H-bridge driving circuit.

[0041] SBC chip is system basis chip.

[0042] Existing car seats use a seat controller to adjust the seat's motors and maintain position memory, while a massage controller controls the seat's massage system. This massage controller uses LIN communication, requiring the seat controller to forward control commands for the massage system. This results in the inability to troubleshoot or upgrade the massage system after a malfunction. The present invention's car seat control circuit eliminates the need for two separate controllers to control the massage system and other components. Instead, a single master control circuit sends control commands to the massage system and motors, facilitating troubleshooting and upgrading the massage system after a malfunction. Furthermore, the master control circuit communicates with other terminals via both CAN and LIN communication, ensuring a stable and reliable communication connection.

[0043] like Figure 2 As shown, in one embodiment, the key drive circuit includes: a voltage divider branch, one end of which is connected to a first power supply voltage and the other end is grounded through a first control switch, the voltage divider point of which is connected in series with the key switch and the first grounding resistor and then grounded, and the controlled end of the first control switch is connected to the IO pin of the main control circuit through a first current limiting resistor; the voltage divider point is also connected to the IO pin of the main control circuit through a sixth current limiting resistor; and a wake-up signal generating circuit, which is connected in series between the voltage divider point and the IO pin of the SBC chip, and is used to send a high-level signal to the main control circuit through the SBC chip to wake up the main control circuit when the voltage divider point is at a low potential.

[0044] When the key switch is closed, the potential at the voltage divider point is pulled low. After this, the wake-up signal generation circuit first sends a high-level signal to the SBC chip. Upon receiving the high-level signal, the SBC chip sends a high-level wake-up signal to the main control circuit, causing the main control circuit to transition from a dormant state to an active state. After waking up, the main control circuit detects the decrease in the potential at the voltage divider point, thereby determining that the corresponding key switch is pressed and performing the corresponding action. When the key switch is opened, the potential at the voltage divider point returns to a high level, and the wake-up signal generation circuit stops sending the high-level signal to the main control circuit. Using this embodiment of the key driver circuit enables the main control circuit to accurately detect whether a key switch is pressed.

[0045] like Figure 3As shown, in one embodiment, the wake-up signal generating circuit includes a second control switch Q2, one end of which is connected to the second supply voltage Vbat,Filt, and the other end is grounded through a second grounding resistor R54 and connected to an IO pin of the SBC chip. The controlled end of the second control switch is connected to a voltage divider point through a first resistor R49. When the voltage divider point is at a low voltage, the second control switch is turned on. The voltage divider branch of the key drive circuit includes a tenth resistor R50 and an eleventh resistor R45 connected in series, wherein one end of the eleventh resistor R45 is connected to the first supply voltage Vcc 5V. The tenth resistor R50 is grounded through the first control switch Q1. The controlled end of the first control switch Q1 is connected to an IO pin of the main control circuit through a first current-limiting resistor R52. In the figure, terminal A is connected to the key switch, terminals B and C are connected to the IO pins of the main control circuit, and terminal D is connected to the IO pin of the SBC chip.

[0046] In this embodiment, the second control switch Q2 and the first control switch Q1 both use triodes. To provide current limiting protection for the second control switch, a third resistor R51 is connected in series between the emitter and base of the second control switch. To provide current limiting protection for the first control switch, a fourth resistor R53 is connected in series between the emitter and base of the first control switch Q1.

[0047] like Figure 4 As shown, in one embodiment, an H-bridge drive circuit includes a first branch and a second branch connected in parallel. The first branch includes a third control switch Q3 and a fourth control switch Q4 connected in series, and the second branch includes a fifth control switch Q5 and a sixth control switch Q6 connected in series. The connection point between the third and fourth control switches and the connection point between the fifth and sixth control switches are used to connect to a load and provide power to the load. RC filter circuits are connected in parallel at both ends of the third, fourth, fifth, and sixth control switches. The controlled ends of the third, fourth, fifth, and sixth control switches are respectively connected to the IO pins of the main control circuit. The first end of the first branch is grounded, and the second end is connected to the third power supply voltage Vbat, Filt_1. Taking the third control switch as an example, the RC filter circuit connected in parallel at both ends includes a twenty-fifth resistor R25 and a twenty-fourth resistor R24 ​​connected in series. In the figure, endpoints E, F, G, H, I, and J are all connected to the IO pins of the main control circuit.

[0048] In this embodiment, the third control switch, the fourth control switch, the fifth control switch and the sixth control switch are all MOS tubes. In other embodiments, switching tubes such as triodes and IGBTs may also be used.

[0049] Since overvoltage and oscillation may occur when the control switch is turned off, connecting a filter circuit in parallel across the control switch can smooth out these voltage fluctuations and reduce the peak voltage, thereby protecting the control switch and other circuit components from damage.

[0050] In order to monitor the voltage of the load of the H-bridge drive circuit, in one embodiment, the first end of the first branch is grounded through a sampling resistor R35, and the two ends of the sampling resistor are respectively connected to the IO pins of the main control circuit to collect the voltage when the H-bridge drive circuit is operating.

[0051] like Figure 5 As shown, in one embodiment, the solenoid valve drive circuit includes a seventh control switch Q7. One end of the seventh control switch is connected in series with the solenoid valve coil K3 and then to the fourth power supply voltage. The other end of the seventh control switch is grounded GND. The controlled end of the seventh control switch is connected to the IO pin of the main control circuit via a second current-limiting resistor R6. In the figure, both endpoints K and L are connected to the IO pin of the main control circuit.

[0052] The main control circuit controls the on and off of the seventh control switch to control the coil of the solenoid valve to be energized or de-energized, thereby controlling the working state of the solenoid valve.

[0053] To prevent the reverse electromotive force generated when the solenoid valve coil is de-energized from damaging the seventh control switch, a freewheeling diode D3 is connected in parallel across the solenoid valve coil. To provide current limiting protection for the seventh control switch Q7, in one embodiment, a fifth current-limiting resistor R11 is connected in parallel between the ground terminal and the controlled terminal of the seventh control switch Q7.

[0054] like Figure 6 As shown, in one embodiment, the Hall signal acquisition circuit includes an operational amplifier OP1, the power supply terminal and the inverting input terminal of the operational amplifier are connected to the Hall signal receiving terminal VS_Hall, the inverting input terminal is also grounded through a fourth grounding resistor (not shown in the figure), the ground terminal is grounded GND, the non-inverting input terminal is connected to the Hall signal receiving terminal through a current limiting branch, the output terminal is connected to the fifth power supply voltage through a pull-up resistor R31, and is connected to the IO pin of the main control circuit through a third current limiting resistor R30. The Hall signal receiving terminal is used to connect to the Hall element provided on the motor of the car seat. The current limiting branch includes a fifth resistor R20 and a sixth resistor R21 connected in series. In the figure, terminal M is connected to the IO pin of the main control circuit.

[0055] The working principle of the Hall signal acquisition circuit of this embodiment is: when the Hall signal receiving end receives the Hall signal, the operational amplifier works normally and outputs a voltage signal. Since the output end of the operational amplifier is connected to the fifth power supply voltage through a pull-up resistor, the output voltage signal will become a high-level signal input to the main control circuit.

[0056] In order to filter out interference signals and make the Hall signal acquisition circuit work more reliably, a first filter capacitor C1 is connected in series between the Hall signal receiving end and the ground, and a second filter capacitor C2 is connected in series between the in-phase input end and the ground.

[0057] like Figure 7 As shown, in one embodiment, a ventilation drive circuit is further included, which includes a second resistor R2 and an eighth control switch Q8. One end of the second resistor is connected to the first power supply voltage Vcc 5V, and the other end is connected to the power supply terminal of the fan, and is grounded through a voltage sampling branch and grounded through the eighth control switch. The controlled end of the eighth control switch is connected to the IO pin of the main control circuit through a fourth current limiting resistor R10, and the sampling point of the voltage sampling branch is connected to the IO pin of the main control circuit. The voltage sampling branch includes a first voltage dividing resistor R3 and a second voltage dividing resistor R14 connected in series. In this embodiment, the eighth control switch is a transistor, whose emitter is grounded to GND through a third grounding resistor R13. Endpoints N and P in the figure are both connected to the IO pin of the main control circuit, and end point O is connected to the power supply terminal of the fan.

[0058] The main control circuit can control the connection or disconnection between the fan and the power supply by controlling the conduction and disconnection of the eighth control switch.

[0059] In one embodiment, Figure 8 As shown, the main control circuit includes a single-chip microcomputer and multiple pre-driver chips connected to the single-chip microcomputer. The IO pins of the single-chip microcomputer are respectively connected to the controlled ends of the first control switch, the second control switch, the third control switch, the fourth control switch, the fifth control switch, the sixth control switch, the seventh control switch, and the eighth control switch, and are also connected to the output end of the wake-up signal generating circuit and the output end of the operational amplifier. The IO pins of the pre-driver chip are connected to each H-bridge driver circuit.

[0060] By providing a pre-driver chip, the circuit of the car seat can be protected from overcurrent, overvoltage, undervoltage and overtemperature, thereby improving the integration of the circuit of the car seat.

[0061] In the above description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0062] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0063] Although this specification has shown and described a number of embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will recognize numerous modifications, variations, and alternatives without departing from the concept and spirit of the present invention. It should be understood that in practicing the present invention, various alternatives to the embodiments of the present invention described herein may be employed.

Claims

1. A car seat control circuit, characterized in that: include: The main control circuit is connected to the key drive circuit to detect the status of each key on the car seat and control the car seat accordingly based on the status of each key; it is connected to the Hall signal acquisition circuit to collect the Hall signal of the motor of the car seat to obtain the motor operation status; Multiple H-bridge drive circuits, with the controlled end of each H-bridge drive circuit connected to the main control circuit, and the load connection end of each H-bridge drive circuit respectively connected to the motor, air pump and heating circuit of the car seat, for driving the motor, air pump and heating circuit according to the instructions of the main control circuit; The motor is used to adjust the posture of the seat, the air pump is used to control the inflation and deflation of the lumbar support air bag assembly and the massage air bag assembly of the car seat through the air pipe assembly, and the heating circuit is used to heat the seat; each button is used to send control signals of the motor, air pump, solenoid valve and heating circuit of the car seat to the main control circuit; A solenoid valve drive circuit, wherein a controlled end thereof is connected to a main control circuit, and a control end thereof is connected to a solenoid valve of a car seat, wherein the solenoid valve is used to control the on-off of the pipeline of the air pipe assembly; An SBC chip is connected to the control circuit and is used to provide power, CAN communication connection and LIN communication connection for the control circuit.

2. The car seat control circuit according to claim 1, wherein: The key driving circuit includes: A voltage dividing branch, one end of which is connected to a first power supply voltage and the other end is grounded via a first control switch. A voltage dividing point of the voltage dividing branch is connected in series with a push button switch and a first grounding resistor and then to ground. The voltage dividing branch is also connected to an IO pin of the main control circuit via a sixth current-limiting resistor. A controlled end of the first control switch is connected to the IO pin of the main control circuit via the first current-limiting resistor. The wake-up signal generating circuit is connected in series between the voltage dividing point and the IO pin of the SBC chip, and is used to send a high-level signal to the main control circuit through the SBC chip to wake up the main control circuit when the voltage dividing point is at a low potential.

3. The method according to claim 2, wherein: The wake-up signal generating circuit includes a second control switch, one end of the second control switch is connected to a second supply voltage, the other end is grounded through a second grounding resistor, and is connected to an IO pin of the SBC chip, and a controlled end of the second control switch is connected to the voltage dividing point through a first resistor. When the voltage dividing point is at a low potential, the second control switch is turned on.

4. The car seat control circuit according to claim 1, wherein: The H-bridge drive circuit includes a first branch and a second branch connected in parallel, the first branch includes a third control switch and a fourth control switch connected in series, the second branch includes a fifth control switch and a sixth control switch connected in series, the connection point between the third control switch and the fourth control switch and the connection point between the fifth control switch and the sixth control switch are used to connect a load to power the load, and an RC series circuit is connected in parallel at both ends of the third control switch, the fourth control switch, the fifth control switch and the sixth control switch; the controlled ends of the third control switch, the fourth control switch, the fifth control switch and the sixth control switch are respectively connected to the IO pins of the pre-driver chip; the first end of the first branch is grounded, and the second end is connected to the third power supply voltage.

5. The car seat control circuit according to claim 4, characterized in that: The first end of the first branch is grounded through a sampling resistor, and both ends of the sampling resistor are respectively connected to the IO pins of the main control circuit to collect the voltage of the H-bridge driving circuit when it is working.

6. The car seat control circuit according to claim 1, wherein: The solenoid valve drive circuit includes a seventh control switch, one end of which is connected in series with the coil of the solenoid valve and then connected to the fourth power supply voltage, the other end of which is grounded, and the controlled end of which is connected to the IO pin of the main control circuit through a second current limiting resistor.

7. The car seat control circuit according to claim 6, characterized in that: A freewheeling diode is connected in parallel at both ends of the coil of the solenoid valve.

8. The car seat control circuit according to claim 1, wherein: The Hall signal acquisition circuit includes an operational amplifier, the power supply end and the inverting input end of the operational amplifier are connected to the Hall signal receiving end, the ground end thereof is grounded, the non-inverting input end thereof is connected to the Hall signal receiving end via a current limiting branch, the output end thereof is connected to a fifth power supply voltage via a pull-up resistor, and is connected to the IO pin of the main control circuit via a third current limiting resistor. The Hall signal receiving end is used to connect to a Hall element provided on the motor of the car seat.

9. The car seat control circuit according to claim 8, characterized in that: A first filter circuit is connected in series between the Hall signal receiving terminal and the ground, and a second filter circuit is connected in series between the in-phase input terminal and the ground.

10. The automobile seat control circuit according to any one of claims 1 to 9, characterized in that: It also includes a ventilation drive circuit, which includes a second resistor and an eighth control switch. One end of the second resistor is connected to the first power supply voltage, and the other end is connected to the power supply end of the fan, and is grounded through a voltage sampling branch and grounded through the eighth control switch. The controlled end of the eighth control switch is connected to the IO pin of the main control circuit through a fourth current limiting resistor.

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