In-vehicle carrier structure circuit

Abstract

The embodiment of the invention provides an in-vehicle carrier structure circuit, relates to the technical field of vehicle control, and is simple in control logic, quick in response and efficient in execution. The control circuit structure provided by the embodiment of the invention comprises a controller area network (CAN) transceiving circuit, a micro control unit (MCU) master control circuit and a motor driving circuit which are electrically connected in sequence, wherein the CAN transceiver circuit is used for converting an input CAN signal of a vehicle machine system into a high-low level signal which can be identified by a micro control unit (MCU), and transmitting the high-low level signal to the MCU main control circuit; the MCU main control circuit generates a motor control signal based on the input high-low level signal and transmits the motor control signal to the motor driving circuit; and the motor driving circuit drives the direct current motor according to the input motor control signal so as to control the movement of the central control armrest box.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and particularly to a vehicle interior carrier structure circuit. Background Art

[0002] Some vehicle models are equipped with a center console armrest box that can slide significantly between the front and rear seats and can be used to arrange mobile phone charging devices, cup holders, refrigerators, etc. Currently, the control of the center console armrest box is generally executed by the vehicle head unit system, and the related control circuits generally use mature control modules provided by third parties. The control logic is relatively complex, the response is slow, and the cost is high. Summary of the Invention

[0003] In view of this, an embodiment of the present invention provides a control circuit structure for a center console armrest box with simple control logic, rapid response, and high execution efficiency, which can significantly reduce the development cost and is easy to promote.

[0004] To achieve the above object, the present invention provides a vehicle interior carrier structure circuit.

[0005] The vehicle interior carrier structure circuit according to an embodiment of the present invention includes a Controller Area Network (CAN) transceiver circuit, a Microcontroller Unit (MCU) main control circuit, and a motor drive circuit that are electrically connected in sequence; wherein, the CAN transceiver circuit converts the input CAN signal of the vehicle head unit system into high and low level signals recognizable by the MCU, and transmits the high and low level signals to the MCU main control circuit; the MCU main control circuit generates a motor control signal based on the input high and low level signals, and transmits the motor control signal to the motor drive circuit; the motor drive circuit drives a DC motor according to the input motor control signal to control the movement of the center console armrest box.

[0006] Preferably, the CAN transceiver circuit includes: an electrostatic protection device for performing electrostatic protection, a common mode filter for suppressing common mode interference signals, and a level conversion chip for converting the CAN signal into the high and low level signals; wherein, the CAN signal enters the level conversion chip after passing through the electrostatic protection device and the common mode filter in sequence.

[0007] Preferably, the MCU main control circuit includes: an MCU device and a power supply circuit for supplying power to the MCU device; wherein, the CAN transmit pin of the level conversion chip is connected to the CAN receive pin of the MCU device, and the CAN receive pin of the level conversion chip is connected to the CAN transmit pin of the MCU device to transmit the CAN signal; the CAN mode selection pin of the level conversion chip is connected to the CAN mode selection pin of the MCU device; the CAN mode includes a high-speed mode and a standby mode.

[0008] Preferably, the power supply circuit includes: a switched power supply circuit and a constant power supply circuit; wherein, the switched power supply circuit includes a power supply controller; the power supply controller converts the system power supply signal into a first power supply signal suitable for the MCU device and then transmits it to the power supply pin and the reset pin of the MCU device; the constant power supply circuit includes a capacitor filter circuit, a differential mode filter circuit, and a low dropout voltage reduction circuit; the vehicle head unit power supply signal is transmitted to the constant power supply pin of the MCU device after passing through the capacitor filter circuit, the differential mode filter circuit, and the low dropout voltage reduction circuit in sequence.

[0009] Preferably, the motor drive circuit includes: an H-bridge circuit for driving the DC motor and a gate drive chip for controlling the H-bridge circuit; wherein, the high-side gate drive output pin, the low-side gate drive output pin, the high-side source pin, and the low-side source pin of the gate drive chip are respectively connected to the control pins of the H-bridge circuit; the power supply pin of the gate drive chip is connected to the power supply pin of the H-bridge circuit.

[0010] Preferably, the motor control pin of the MCU device is connected to the general-purpose interface pin of the gate drive chip to transmit the motor control signal from the MCU main control circuit to the motor drive circuit.

[0011] Preferably, the motor control pins of the MCU device include: an enable control pin, a phase control pin, a mode control pin, and a sleep control pin.

[0012] Preferably, when the mode control pin is at a high level, the H-bridge circuit is in an independent half-bridge mode; when the mode control pin is at a low level, the H-bridge circuit is in an enable or phase mode.

[0013] Preferably, the gate drive chip performs device configuration, operating parameter setting, and fault diagnosis information reading by reading and writing registers through the Serial Peripheral Interface SPI.

[0014] Preferably, the motor drive circuit controls the forward rotation, reverse rotation, or stop of the DC motor based on the instructions of the vehicle head unit system, and performs speed control on the DC motor.

[0015] According to the technical solution of the present invention, one embodiment of the above invention has the following advantages or beneficial effects:

[0016] The in-vehicle carrier structure circuit includes a CAN transceiver circuit, an MCU main control circuit, and a motor drive circuit that are electrically connected in sequence; the CAN transceiver circuit converts the input CAN signal of the vehicle system into high and low level signals recognizable by the MCU and transmits the high and low level signals to the MCU main control circuit; the MCU main control circuit generates a motor control signal based on the input high and low level signals and transmits the motor control signal to the motor drive circuit; the motor drive circuit drives a DC motor according to the input motor control signal to control the movement of the central control armrest box. The above structure has a simple control logic, rapid response, and high execution efficiency, and can also significantly reduce the development cost and is easy to promote.

[0017] The further effects of the above-mentioned non-conventional optional methods will be described below in combination with specific embodiments. Brief Description of the Drawings

[0018] The drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention. Among them:

[0019] Figure 1 is a schematic diagram of the composition of the in-vehicle carrier structure circuit according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the CAN transceiver circuit structure according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the connection relationship of the MCU devices according to an embodiment of the present invention;

[0022] Figure 4 is a first schematic diagram of the switching power supply circuit according to an embodiment of the present invention;

[0023] Figure 5 is a second schematic diagram of the switching power supply circuit according to an embodiment of the present invention;

[0024] Figure 6 is a third schematic diagram of the switching power supply circuit according to an embodiment of the present invention;

[0025] Figure 7 is a first schematic diagram of the constant power supply circuit according to an embodiment of the present invention;

[0026] Figure 8 is a second schematic diagram of the constant power supply circuit according to an embodiment of the present invention;

[0027] Figure 9 is a schematic diagram of the connection relationship of the gate drive chip according to an embodiment of the present invention;

[0028] Figure 10 is a schematic diagram of the connection relationship of the H-bridge circuit according to an embodiment of the present invention. Detailed Description of the Invention

[0029] The following describes exemplary embodiments of the present invention with reference to the accompanying drawings. Various details of the embodiments of the present invention are included to facilitate understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, descriptions of well-known functions and structures are omitted in the following description for clarity and conciseness.

[0030] Figure 1 is a schematic diagram of the composition of the in-vehicle carrier structure circuit according to an embodiment of the present invention; Figure 2 is a schematic diagram of the CAN transceiver circuit structure according to an embodiment of the present invention; Figure 3 is a schematic diagram of the connection relationship of the MCU device according to an embodiment of the present invention; Figure 4 is a first schematic diagram of the switched power supply circuit according to an embodiment of the present invention; Figure 5 is a second schematic diagram of the switched power supply circuit according to an embodiment of the present invention; Figure 6 is a third schematic diagram of the switched power supply circuit according to an embodiment of the present invention; Figure 7 is a first schematic diagram of the constant power supply circuit according to an embodiment of the present invention; Figure 8 is a second schematic diagram of the constant power supply circuit according to an embodiment of the present invention; Figure 9 is a schematic diagram of the connection relationship of the gate driver chip according to an embodiment of the present invention; Figure 10 is a schematic diagram of the connection relationship of the H-bridge circuit according to an embodiment of the present invention.

[0031] See Figures 1-10 , the present invention provides an in-vehicle carrier structure circuit, including a Controller Area Network (CAN) transceiver circuit, an MCU (Microcontroller Unit) main control circuit, and a motor drive circuit that are electrically connected in sequence.

[0032] Among them, the CAN transceiver circuit converts the input CAN signal of the vehicle system into high and low level signals recognizable by the microcontroller unit (MCU), and transmits the high and low level signals to the MCU main control circuit. See Figure 2 , the CAN signal can be a CANH signal and a CANL signal, and the high and low level signals can be a CAN_TX signal (CAN transmit signal) and a CAN_RX signal (CAN receive signal). The MCU main control circuit generates a motor control signal based on the input high and low level signals, and transmits the motor control signal to the motor drive circuit. See Figure 3, the motor control signal may include Motor_INA signal and Motor_INB signal, which can be used for the enable control and phase control of the DC motor respectively. The motor control signal may also include a mode control signal, a sleep control signal, etc. The motor drive circuit drives the DC motor according to the input motor control signal to control the movement of the central control console armrest.

[0033] See Figure 2 . In the embodiment of the present invention, the CAN transceiver circuit includes: an electrostatic protection device T1 for performing electrostatic protection, a common mode filter L1 for suppressing common mode interference signals, and a level conversion chip U1 for converting CAN signals into high and low level signals. Among them, the CAN signal passes through the electrostatic protection device T1 and the common mode filter L1 in sequence and then enters the level conversion chip U1. The level conversion chip U1 can convert the differential level of the CAN bus into the high and low level logic recognizable by the MCU. The electrostatic protection device T1 is a highly efficient ESD (Electro-Static Discharge) electrostatic protection component, which is mainly used to protect the CAN transceiver circuit from the influence of ESD and other harmful transient voltage events in high-speed and fault-tolerant networks, playing the role of electrostatic protection. The common mode filter L1 is used to suppress common mode interference signals and improve the anti-interference ability of the circuit. The CAN transceiver circuit is mainly used to realize the CAN signal transceiver between the MCU and the vehicle system. When the MCU sends data and sets CAN_TX to high level, the CANL and CANH levels are both 2.5V. When CAN_TX is set to low level, the CANL level is 1.5V and the CANH level is 3.5V.

[0034] See Figure 3 . In one embodiment, the MCU main control circuit includes: an MCU device and a power supply circuit for supplying power to the MCU device. Among them, the CAN transmit pin (CAN_TX) of the level conversion chip is connected to the CAN receive pin (CAN_RX) of the MCU device, and the CAN receive pin (CAN_RX) of the level conversion chip is connected to the CAN transmit pin (CAN_TX) of the MCU device to transmit CAN signals; the CAN mode selection pin (CAN STB) of the level conversion chip is connected to the CAN mode selection pin (CANSTB) of the MCU device; the CAN mode includes a high-speed mode and a standby mode. In practical applications, when the CAN mode selection pin is at high level, it is in the standby mode, and when it is at low level, it is in the high-speed mode.

[0035] In Figure 3 , SWCLK represents the clock, SWDIO represents the serial clock input, which is the clock signal line for simulation signals. MCU_ACC_IN is the wake-up pin, and HALL_IN represents the Hall signal.

[0036] SeeFigures 4-6 As a preferred solution, the power supply circuit includes: a switched power supply circuit and a constant power supply circuit. Among them, the switched power supply circuit includes a power supply control device U2; the power supply control device converts the system power signal into a first power signal suitable for the MCU device and then transmits it to the power supply pins VDDA, VDD and the reset pin RESET of the MCU device. Figure 4 A plurality of filter capacitors and current limiting resistors are also shown in Figure 5 The filtering processing method of the first power signal is shown in Figure 6 The MCU reset connection method based on the filter capacitor and the current limiting resistor is shown.

[0037] See Figure 7 、 8 Preferably, the constant power supply circuit includes a capacitive filter circuit based on a plurality of capacitors (C31 - C37), a differential mode filter circuit based on an inductor L2, and a low dropout voltage regulator circuit (i.e., an LDO circuit); the vehicle head unit power signal KL30_IN is sequentially transmitted to the constant power supply pin KL30 ADC of the MCU device after passing through the capacitive filter circuit, the differential mode filter circuit, and the low dropout voltage regulator circuit.

[0038] See Figure 9 、 10 In the embodiment of the present invention, the motor drive circuit includes: an H-bridge circuit for driving a DC motor and a gate drive chip for controlling the H-bridge circuit. Among them, the motor drive circuit controls the forward rotation, reverse rotation or stop of the DC motor based on the instructions of the vehicle head unit system, and performs speed control on the DC motor. The gate drive chip is an H-bridge gate driver that drives the DC motor through four N-MOSFETs of the H-bridge circuit. The gate drive chip uses a configurable input interface for control and provides three control methods to meet different requirements. The control mode is selected through the MODE pin (mode control pin). When it is at a high level, it is in the independent half-bridge mode. When it is at a low level, it is in the H-bridge PH / EN mode (enable or phase mode). When it is in the output state, it is the H-bridge pulse width modulation signal PWM. The gate drive chip realizes functions such as device configuration, operating parameter setting, and fault diagnosis information reading through SPI (Serial Peripheral Interface) reading and writing registers.

[0039] In an exemplary embodiment, the high-side gate drive output pins GH1 and GH2, the low-side gate drive output pins GL1 and GL2, the high-side source pins OUT1 and OUT2, and the low-side source pin SL2 of the gate drive chip are respectively connected to the control pins of the H-bridge circuit, and the power supply pin VM of the gate drive chip is connected to the power supply pin VM of the H-bridge circuit, thereby realizing the control of the H-bridge circuit by the gate drive chip. The motor control pins of the MCU device are connected to the general-purpose interface pins (GPIO pins) of the gate drive chip to transmit the motor control signal from the MCU main control circuit to the motor drive circuit. Preferably, the above motor control pins of the MCU device include: a phase control pin (Motor_INA, connected to the IN1 / PH pin of the gate drive chip), an enable control pin (Motor_INB, connected to the IN2 / EN pin of the gate drive chip), a mode control pin (Motor_Mode, connected to the MODE pin of the gate drive chip), and a sleep control pin (Motor_Sleep, connected to the nSLEEP pin of the gate drive chip).

[0040] In Figure 9 it, the SDO pin is used for SPI serial data output, the nSCS pin is used for chip selection, the SDI pin is used for SPI serial data input, the SCLK pin is used for SPI serial clock input, nSLEEP is the sleep control pin, nFAULT is the fault indication pin, MODE is the mode control pin, DVDD is the digital voltage regulator pin, AVDD is the analog voltage regulator pin, the VREF pin is used for input reference voltage, the SO pin is used for the output of the current sampling amplifier, the SP pin is used for the positive input of the amplifier, the SN pin is used for the negative input of the amplifier, the VDRAIN pin is used for high-side drain connection, the VCP pin is used for charge pump output, and CP1 and CP2 are charge pump switch nodes.

[0041] In the technical solution of the present invention, the control circuit structure of the center console armrest box includes a CAN transceiver circuit, an MCU main control circuit, and a motor drive circuit that are electrically connected in sequence; the CAN transceiver circuit converts the input CAN signal of the vehicle system into high and low level signals recognizable by the MCU and transmits the high and low level signals to the MCU main control circuit; the MCU main control circuit generates a motor control signal based on the input high and low level signals and transmits the motor control signal to the motor drive circuit; the motor drive circuit drives the DC motor according to the input motor control signal to control the movement of the center console armrest box. The above structure has a simple control logic, rapid response, and high execution efficiency, and can also greatly reduce the development cost and is easy to promote.

[0042] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An in-vehicle carrier structure circuit, characterized in that, It includes a Controller Area Network (CAN) transceiver circuit, a microcontroller unit (MCU) main control circuit, and a motor drive circuit that are electrically connected in sequence. Among them, the CAN transceiver circuit converts the input CAN signal of the in-vehicle system into high and low level signals recognizable by the microcontroller unit (MCU), and transmits the high and low level signals to the MCU main control circuit. The MCU main control circuit generates a motor control signal based on the input high and low level signals, and transmits the motor control signal to the motor drive circuit. The motor drive circuit drives a DC motor according to the input motor control signal to control the movement of the central control armrest box.

2. The in-vehicle carrier structure circuit according to claim 1, wherein The CAN transceiver circuit includes: an electrostatic protection device for performing electrostatic protection, a common mode filter for suppressing common mode interference signals, and a level conversion chip for converting the CAN signal into the high and low level signals. Among them, the CAN signal enters the level conversion chip after passing through the electrostatic protection device and the common mode filter in sequence.

3. The in-vehicle carrier structure circuit according to claim 2, characterized in that, The MCU main control circuit includes: an MCU device and a power supply circuit for supplying power to the MCU device; among them, The CAN transmit pin of the level conversion chip is connected to the CAN receive pin of the MCU device, and the CAN receive pin of the level conversion chip is connected to the CAN transmit pin of the MCU device to transmit the CAN signal. The CAN mode selection pin of the level conversion chip is connected to the CAN mode selection pin of the MCU device; the CAN mode includes a high-speed mode and a standby mode.

4. The in-vehicle carrier structure circuit according to claim 3, characterized in that, The power supply circuit includes: a switched power supply circuit and a constant power supply circuit; among them, The switched power supply circuit includes a power supply control device; the power supply control device converts the system power signal into a first power signal suitable for the MCU device and then transmits it to the power supply pin and reset pin of the MCU device. The constant power supply circuit includes a capacitor filter circuit, a differential mode filter circuit, and a low dropout voltage reduction circuit; the in-vehicle power supply signal is transmitted to the constant power supply pin of the MCU device after passing through the capacitor filter circuit, the differential mode filter circuit, and the low dropout voltage reduction circuit in sequence.

5. The in-vehicle carrier structure circuit according to claim 4, characterized in that, The motor drive circuit includes: an H-bridge circuit for driving the DC motor and a gate drive chip for controlling the H-bridge circuit. Among them, the high-side gate drive output pin, low-side gate drive output pin, high-side source pin, and low-side source pin of the gate drive chip are respectively connected to the control pins of the H-bridge circuit. The power supply pin of the gate drive chip is connected to the power supply pin of the H-bridge circuit.

6. The in-vehicle carrier structure circuit according to claim 5, characterized in that, The motor control pin of the MCU device is connected to the general interface pin of the gate drive chip to transmit the motor control signal from the MCU main control circuit to the motor drive circuit.

7. The in-vehicle carrier structure circuit according to claim 6, wherein The motor control pins of the MCU device include: an enable control pin, a phase control pin, a mode control pin, and a sleep control pin.

8. The in-vehicle carrier structure circuit according to claim 7, wherein, When the mode control pin is at a high level, the H-bridge circuit is in an independent half-bridge mode; when the mode control pin is at a low level, the H-bridge circuit is in an enable or phase mode.

9. The in-vehicle carrier structure circuit according to claim 5, wherein The gate driver chip reads and writes registers through the Serial Peripheral Interface (SPI) to perform device configuration, operating parameter setting, and fault diagnosis information reading.

10. The in-vehicle carrier structure circuit according to claim 5, wherein, The motor drive circuit controls the forward rotation, reverse rotation, or stop of the DC motor based on the instructions of the vehicle-mounted system, and performs speed control on the DC motor.

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