Seat signal acquisition and storage circuit, device and terminal
By designing a seat signal acquisition and storage circuit to automatically acquire and store seat signals, the problem of poor timeliness response in the existing technology is solved, efficient signal acquisition and storage is achieved, and application threshold is lowered.
Patent Information
- Application Number
- CN202421624557.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-10
AI Technical Summary
In the case of seat product failure response, personnel who rely on professional skills carry professional equipment to collect signals, resulting in cross-regional pulling of resources, poor timeliness and unsmooth information transmission.
A seat signal acquisition and storage circuit is designed, including an MCU control unit, a signal acquisition unit, a TF storage unit, a display unit and a power management unit, which can automatically collect bus signals and analog signals of the seat and store them in the TF storage unit.
Reduce dependence on manual collection of on-site data, reduce the threshold for on-site application of factories, improve customer response speed, and realize efficient collection and storage of seat signals.
Smart Images
Figure CN222774828U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of signal acquisition, and in particular to a seat signal acquisition storage circuit, a device and a terminal. Background Art
[0002] At present, seat products have electrical function problems on site, such as at customers, after-sales, and factories, involving bus and analog signal measurement and recording, such as module function failure, adjustment failure, and other problems. In order to respond quickly and find out the cause of the problem as soon as possible, it is necessary to coordinate engineers with certain skills to bring special equipment such as communication boxes, host computers, oscilloscopes, computers and other data acquisition equipment to the site for wiring, and collect the output signal of the seat to determine the failure point of the problem. Such personnel who rely on professional skills to carry professional testing equipment to the site to collect signals often need to pull resources across regions, the timeliness of problem response is poor, and the transmission of files and information status is not smooth. In view of this, it is necessary to propose a seat signal acquisition and storage terminal to automatically collect relevant signals. Utility Model Content
[0003] The utility model aims to provide a seat signal acquisition storage circuit, a device and a terminal.
[0004] The utility model provides a seat signal acquisition and storage circuit, comprising an MCU control unit and a signal acquisition unit, a TF storage unit, a display unit and a power management unit electrically connected to the MCU control unit respectively.
[0005] The signal acquisition unit is used to collect bus signals and analog signals related to the seat;
[0006] The MCU control unit is used to adapt the communication rate according to the seat bus signal and establish effective communication, and send a save instruction to the TF storage unit after receiving the input of the analog signal;
[0007] The TF storage unit is used to temporarily store the seat information passed through the MCU control unit in the RAM and then store it in an external TF storage unit;
[0008] The power management unit includes an LDO1 power management unit, an LDO2 power management unit and a supercapacitor charging unit, wherein the input end of the LDO1 power management unit is connected to a power supply, the output end of the LDO1 power management unit is connected to an MCU control unit, the input end of the LDO2 power management unit is connected to a power supply, and the output end of the LDO1 power management unit and the supercapacitor charging unit are connected to the MCU control unit for supplying power to the MCU control unit and the display unit.
[0009] Preferably, the supercapacitor charging unit includes a supercapacitor C21, a first resistor R20, a first diode D8, a second resistor R19, a transistor Q2, a third resistor R18 and a field effect transistor U6.
[0010] One end of the super capacitor C21 is connected to the LDO2 power management unit in sequence with the first resistor R20 and the first diode D8, the other end of the super capacitor C21 is connected to one end of the second resistor R19, the other end of the second resistor R19 is connected to the collector of the transistor Q2, the base of the transistor Q2 and the third resistor R18 are connected to the corresponding POWCTRL judgment signal end on the MCU control unit, the emitter of the transistor Q2 is grounded, and the other end of the super capacitor C21 is connected to the field effect transistor U6 and the MCUPOW power signal end corresponding to the LDO1 power management unit, and the seat-related signal is cached in F l ash according to the status signal pair, thereby starting the super capacitor C21 to supply power to the MCU control unit through the LDO1 power management unit to complete the storage task.
[0011] Preferably, the LDO1 power management unit includes a voltage stabilizing circuit U7, a first capacitor C22, a second capacitor C23, a third capacitor C24 and a fourth capacitor C25, the IN end of the voltage stabilizing circuit U7 is connected to the corresponding MCUPOW power signal end on the supercapacitor charging unit, the first capacitor C22 and the second capacitor C23 connected in parallel are connected and grounded, the TAB end of the voltage stabilizing circuit U7 is connected to a 3.3V power supply, and the OUT end of the voltage stabilizing circuit U7 is connected to a 3.3V power supply with the third capacitor C24 and the fourth capacitor C25 connected in parallel.
[0012] Preferably, the LDO2 power management unit includes a DC-DC power chip U5, a thermistor R17, a second diode D5, a first capacitor C19, a second capacitor L2, a third capacitor C20, a fourth resistor R23, a transistor Q3 and a fifth resistor R33, the VI N terminal of the DC-DC power chip U5 is connected to a 12V power supply at one end of the thermistor R17, and the VI of the DC-DC power chip U5 is connected to a 12V power supply at one end of the thermistor R17. The N end is respectively connected to the second diode D5 and the first capacitor C19 and grounded, the OUT end of the DC-DC power chip U5 is connected to one end of the second capacitor L2, the other end of the second capacitor L2 is connected to one end of the third capacitor C20, the other end of the third capacitor C20 is grounded, the FB end of the DC-DC power chip U5 is connected to one end of the fourth resistor R23, the other end of the fourth resistor R23 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the corresponding PCHK signal end on the MCU control unit, and the collector of the transistor Q3 is connected to the fifth resistor R33. 3V power supply is used to charge the super capacitor C21 when working and output the PCHK signal to the MCU chip to determine whether the power is in a power-off state.
[0013] Preferably, the signal acquisition unit includes an isolated CAN transceiver U10, a LIN transceiver, a common mode containment unit and an analog quantity acquisition unit, the input end of the isolated CAN transceiver is connected to an external CAN bus, the output end of the isolated CAN transceiver and the output end of the LIN transceiver are respectively connected to the input end of the common mode containment unit, and are connected to the MCU control unit through TX / RX signals; the external input analog signal is connected to the input end of the acquisition unit, and the output end of the acquisition unit is connected to the input end corresponding to the AD analog port of the MCU control unit, wherein the common mode containment unit consists of a transient voltage suppressor ESD1 and a common mode inductor U8, the first port of the common mode inductor U8 is connected to one end of the transient voltage suppressor ESD1, the second port of the common mode inductor U8 is connected to the other end of the transient voltage suppressor ESD1, the third port of the common mode inductor U8 is connected to the CAN1 L signal end corresponding to the isolated CAN transceiver U10, and the fourth port of the common mode inductor U8 is connected to the CAN1 H signal end corresponding to the isolated CAN transceiver U10.
[0014] Preferably, the analog quantity acquisition unit includes a plurality of attenuators, each of the attenuators includes a connector, a sixth resistor, a seventh resistor, a voltage-stabilizing diode and a fourth capacitor, the second port of the connector is grounded, the first port of the connector is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the negative electrode of the voltage-stabilizing diode, the positive electrode of the voltage-stabilizing diode is grounded, and the other end of the sixth resistor is connected to one end of the seventh resistor and grounded, while the other end of the sixth resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to the other end of the seventh resistor and grounded.
[0015] Preferably, the display unit includes an HMI button unit and an LCD display, the output end of the HMI button unit is connected to the input end of the MCU control unit, and the input end of the LCD display is connected to the output end of the MCU control unit, for HMI interaction and signal status display.
[0016] Preferably, the MCU control unit adopts an STM32H750 chip.
[0017] The utility model also provides a seat signal acquisition and storage device, which includes the seat signal acquisition and storage circuit as described in this embodiment.
[0018] The utility model also provides a seat signal acquisition and storage terminal, and the terminal comprises the seat signal acquisition and storage circuit as described in this embodiment.
[0019] In view of the prior art, the utility model has the following beneficial effects:
[0020] The utility model provides a seat signal acquisition and storage circuit, device and terminal, which are suitable for the acquisition and storage of seat signals, have the function of adaptively judging the communication rate of the seat bus and establishing effective communication, and each unit also supports analog signal input, reduces the reliance on manual collection of on-site data, effectively lowers the threshold for on-site application in factories, and further improves the customer response speed. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the overall process of the seat signal acquisition and storage circuit described in the embodiment of the utility model;
[0022] Figure 2 This is a specific circuit diagram of the MCU control unit in the embodiment of the utility model;
[0023] Figure 3 A specific circuit diagram of a power management unit in an embodiment of the utility model;
[0024] Figure 4This is a specific circuit diagram of the signal acquisition unit in the embodiment of the utility model;
[0025] Figure 5 This is a specific circuit diagram of the analog quantity acquisition unit in the embodiment of the utility model;
[0026] Figure 6 Detailed circuit diagram of the TF storage unit in the embodiment of the present utility model. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] See Figure 1-2 As shown, the utility model provides a seat signal acquisition and storage circuit, including an MCU control unit and a signal acquisition unit, a TF storage unit, a display unit and a power management unit electrically connected to the MCU control unit respectively, the signal acquisition unit is used to collect bus signals and analog signals related to the seat, and the seat-related signals at least include seat position signals, seat corresponding status information, fault status and analog signals related to seat working properties; the MCU control unit is used to adapt the communication rate according to the seat bus signal and establish effective communication, and at the same time send a save instruction to the TF storage unit after receiving the input of the analog signal; the TF The storage unit is used to temporarily store the seat information after the MCU control unit in the RAM and then save it in the external TF storage unit, supporting high-speed TF cards above HC; the power management unit includes an LDO1 power management unit, an LDO2 power management unit and a super capacitor charging unit, the input end of the LDO1 power management unit is connected to the power supply, the output end of the LDO1 power management unit is connected to the MCU control unit, the input end of the LDO2 power management unit is connected to the power supply, and the output end of the LDO1 power management unit is connected to the super capacitor charging unit to the MCU control unit, which is used to supply power to the MCU control unit and the display unit. It can be understood that, Figure 3As shown, this circuit includes two LDO power supply units; one LM1117 generates 3.3V for MCU, LCD display, LIN, and CAN. Another LDO2 generates 5V and uses LM2596 to charge the supercapacitor C21 during operation and output PCHK to the MCU chip to determine whether the power is off; U3 button battery and U6 form a backup power supply for the MCU's RTC and setting information storage. The seat signal acquisition and storage circuit used in this embodiment does not require professional knowledge, that is, anyone can operate, set up or configure it; CAN, LIN bus and multiple channels such as this circuit 4ch analog signal synchronous acquisition; the built-in acquisition capacitor automatically judges and saves the timestamp and original setting information after power failure; multiple anti-interference imitation misuse and misconnection lead to product damage; low cost and suitable for production sites.
[0029] The seat signal acquisition and storage circuit, device and terminal provided by the utility model are suitable for the acquisition and storage of seat signals such as bus and analog quantities, and have the function of adaptively judging the communication rate of the seat bus (CAN, CAN FD, LIN) and establishing effective communication. Each unit also supports analog signal input. After receiving a valid signal, the CPU automatically acquires and stores it. When the module receives a request to stop acquisition or meets the power-off judgment logic such as the acquisition voltage is lower than the set threshold, the supercapacitor is used to support the CPU to process data and save it in a TF storage card. The TF storage card uses the standard FAT universal format and the corresponding acquisition data can be analyzed and judged by ordinary Office software. The application threshold of the factory site is effectively lowered, and the customer response speed is further improved.
[0030] Those skilled in the art can understand that the MCU control unit of this embodiment adopts the STM32H750 chip, the main control STM32 chip is used as the information data processing MCU, the interface chip is used for bus signal processing and level conversion, and the operation buttons such as button ① acquisition setting, ② UP up, DW down, ④ Enter confirmation and dot matrix LCD screen are used as HMI interaction and status display, and the collected data is cached after being processed by the MCU and Flash is saved in the external TF card after being processed by the MCU block, without the need to operate the adaptive communication signal judgment; data recording is performed when a valid signal is collected; the power management chip LDO ensures reliable operation of a wide voltage of 7V to 35V, such as a supercapacitor for maintaining device configuration information, power-off setting parameters and data preservation; the body reserves USB and MCU communication upgrade Firmware.
[0031] like Figure 4As shown, by collecting and sending the data information of the seat, the data is stored in the TF storage card, and the reading record file is used for problem analysis and module status confirmation. The signal acquisition unit includes an isolated CAN transceiver U10, a LIN transceiver, a common mode containment unit and an analog acquisition unit. Each channel can collect data information at the same time; it is conducive to state locking. Often, the independent signal acquisition timestamp bus and the analog channel may be staggered, which is not conducive to state analysis. Therefore, the isolated CAN transceiver used is I SO1050 in consideration of the complex electromagnetic environment of the factory and the vehicle site. Its input end adopts ESD and common mode inductance to connect to the external CAN bus, and the independent Vcc5 power supply constitutes an isolation circuit. The output end of the CAN receiver and the LI The output ends of the N receivers are respectively connected to the input ends of the corresponding MCU signal units, and establish communication with the MCU control module, that is, the input end of the isolated CAN transceiver is connected to the external CAN bus, the output end of the isolated CAN transceiver and the output end of the LIN transceiver are respectively connected to the input end of the common mode containment unit, and are connected to the MCU control unit through TX / RX signals; the external input analog signal is connected to the input end of the acquisition unit, and the output end of the acquisition unit is connected to the input end corresponding to the AD analog port of the MCU control unit, wherein the common mode containment unit consists of a transient voltage suppressor ESD1 and a common mode inductor U8, the first port of the common mode inductor U8 is connected to one end of the transient voltage suppressor ESD1, the second port of the common mode inductor U8 is connected to the other end of the transient voltage suppressor ESD1, the third port of the common mode inductor U8 is connected to the CAN1 L signal end corresponding to the isolated CAN transceiver U10, and the fourth port of the common mode inductor U8 is connected to the CAN1 H signal end corresponding to the isolated CAN transceiver U10.
[0032] Those skilled in the art can understand that the seat-related signals collected in this embodiment include CAN bus interface chip (ISO1050), LIN bus interface chip (TJA1020), multiple AD analog inputs and corresponding matching circuits, which are used for seat signal collection, including at least the pre-processing on the bus of the seat control module, such as wake-up signals, function drive, such as heating, ventilation, seat position adjustment in all directions, zero gravity mode, wireless charging and other seat corresponding status information, fault information and analog signals related to the working properties of the seat, such as working voltage, sampling current, etc. Among them, the MCU control unit is also used to determine whether the signal is valid according to the received input seat signal. The bus communication uses different rates in different models, such as 250, 500, 1M, 2M, 4MBit / S, etc. The MCU corrects the baud rate according to the received message, so as to achieve the purpose of network adaptive baud rate. This circuit uses the error status register CAN_ESR of the STM32 chip. By querying the status of this register, the current network status and error information of the bus are obtained. When the received message matches, it is configured to be in silent mode. At this time, data frames can be received without sending messages. In order to receive any supported message, the filter is configured to the identifier mask mode, the mask is set to 0, and the status of the CAN_ESR register is queried regularly. When the node continues to have an error, it can be determined that the node does not match the configured baud rate; the baud rate query status is corrected until it is correct. Thus, the baud rate self-adaptation function is realized through the message; the LIN bus adopts two Bit Rates of 10417 and 19200 bytes in the industry, and the communication status is determined by querying the register status.
[0033] like Figure 5 As shown, the analog quantity acquisition unit includes a plurality of attenuators, such as a first attenuator including a connector CN7, a sixth resistor R10, a seventh resistor R12, a voltage-stabilizing diode D4 and a fourth capacitor C18, the second port of the first connector CN7 is grounded, the first port of the first connector CN7 is connected to one end of the sixth resistor R10, the other end of the sixth resistor R10 is connected to the negative electrode of the voltage-stabilizing diode D4, the positive electrode of the voltage-stabilizing diode D4 is grounded, and the other end of the sixth resistor R10 is connected to one end of the seventh resistor R12 and grounded, and at the same time, the other end of the sixth resistor R10 is connected to one end of the fourth capacitor C18, and the other end of the fourth capacitor C18 is connected to the other end of the seventh resistor R12 and grounded, for signal acquisition and judgment.
[0034] The second attenuator includes a connector CN8, a resistor R35, a resistor R25, a voltage-stabilizing diode D12 and a fourth capacitor C26, wherein the second port of the connector CN8 is grounded, the first port of the connector CN8 is connected to one end of the resistor R35, the other end of the resistor R35 is connected to the negative electrode of the voltage-stabilizing diode D12, the positive electrode of the voltage-stabilizing diode D12 is grounded, and the other end of the resistor R35 is connected to one end of the resistor R25 and grounded, while the other end of the resistor R35 is connected to one end of the fourth capacitor C26, and the other end of the fourth capacitor C26 is connected to the other end of the resistor R25 and grounded, for signal acquisition and judgment. The above-mentioned analog quantity acquisition unit is uniformly connected to the peripheral sampling circuit by the attenuator composed of R10 and R12, R25 and R35, R36 and R37, R38 and 39, and has different parameters and is flexible to adapt to different signal conditioning circuits for data acquisition.
[0035] Specifically, the supercapacitor charging unit includes a supercapacitor C21, a first resistor R20, a first diode D8, a second resistor R19, a transistor Q2, a third resistor R18 and a field effect transistor U6. One end of the supercapacitor C21 is connected to the LDO2 power management unit in sequence with the first resistor R20 and the first diode D8. The other end of the supercapacitor C21 is connected to one end of the second resistor R19. The other end of the second resistor R19 is connected to the collector of the transistor Q2. The base of the transistor Q2 and the third resistor R18 are connected to the corresponding POWCTRL judgment signal end on the MCU control unit. The emitter of the transistor Q2 is grounded, and the other end of the supercapacitor C21 is connected to the field effect transistor U6. The MCUPOW power signal end corresponding to the LDO1 power management unit is connected. According to the status signal pair, the seat-related signal is cached in F l ash, thereby starting the supercapacitor C21 to supply power to the MCU control unit through the LDO1 power management unit to complete the storage task. It can be understood that the supercapacitor charging unit used in this embodiment is used to save the collected data at the moment of power failure when the power is off; one end of the supercapacitor is connected to the LDO2 power management unit through D8 and R20 for charging current limiting; the other end of the supercapacitor is connected by the power-off judgment signal POWCTRL, and the seat signal is cached in F l ash according to the status signal to start the supercapacitor to supply power to the MCU through LDO1 to complete the storage task.
[0036] Specifically, the LDO1 power management unit includes a voltage stabilizing circuit U7, a first capacitor C22, a second capacitor C23, a third capacitor C24 and a fourth capacitor C25, the IN end of the voltage stabilizing circuit U7 is connected to the corresponding MCUPOW power signal end on the supercapacitor charging unit, the first capacitor C22 and the second capacitor C23 connected in parallel are connected and grounded, the TAB end of the voltage stabilizing circuit U7 is connected to a 3.3V power supply, and the OUT end of the voltage stabilizing circuit U7 is connected to the 3.3V power supply with the third capacitor C24 and the fourth capacitor C25 connected in parallel.
[0037] Specifically, the LDO2 power management unit includes a DC-DC power chip U5, a thermistor R17, a second diode D5, a first capacitor C19, a second capacitor L2, a third capacitor C20, a fourth resistor R23, a transistor Q3 and a fifth resistor R33. The VI of the DC-DC power chip U5 is The N terminal is connected to one end of the thermistor R17 with a 12V power supply, and the VIN terminal of the DC-DC power supply chip U5 is respectively connected to the second diode D5 and the first capacitor C19 and grounded, the OUT terminal of the DC-DC power supply chip U5 is connected to one end of the second capacitor L2, the other end of the second capacitor L2 is connected to one end of the third capacitor C20, the other end of the third capacitor C20 is grounded, the FB terminal of the DC-DC power supply chip U5 is connected to one end of the fourth resistor R23, the other end of the fourth resistor R23 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the corresponding PCHK signal terminal on the MCU control unit, and the collector of the transistor Q3 is connected to the fifth resistor R33 with a 3.3V power supply, which is used to charge the super capacitor C21 when it is working and output the PCHK signal to the MCU chip to determine whether the power is in a power-off state.
[0038] Specifically, the display unit includes an HM I button unit and an LCD display. The output end of the HM I button unit is connected to the input end of the MCU control unit, and the input end of the LCD display is connected to the output end of the MCU control unit, for HM I interaction and signal status display. In this embodiment, the display unit alarm LCD screen and status LED indication: start to display the self-test version status, display the timestamp, working voltage, storage status such as TF total capacity and free space, bus communication baud rate information, analog voltage value, write TF status when the terminal is working; the status LED displays the voltage and normal transmission status, such as the green light flashing indicates normal acquisition transmission and writing, wherein the LCD display adopts LCD19296, and there are LED units and other switch units. The specific circuit of the TF storage unit can be seen as follows Figure 6 shown.
[0039] This embodiment provides a seat signal acquisition and storage device, and the device includes the seat signal acquisition and storage circuit as described in this embodiment.
[0040] This embodiment provides a seat signal acquisition and storage terminal, characterized in that the terminal includes the seat signal acquisition and storage circuit described in this embodiment.
[0041] The functional principles are as described in the above embodiments of the present invention, and will not be described in detail here. For the parts not described in detail in the device or terminal embodiments, refer to the description of the relevant parts in the circuit embodiments.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A seat signal acquisition and storage circuit, characterized in that: It includes an MCU control unit and a signal acquisition unit, a TF storage unit, a display unit and a power management unit which are electrically connected to the MCU control unit respectively. The signal acquisition unit is used to collect bus signals and analog signals related to the seat; The MCU control unit is used to adapt the communication rate according to the seat bus signal and establish effective communication, and send a save instruction to the TF storage unit after receiving the input of the analog signal; The TF storage unit is used to temporarily store the seat information passed through the MCU control unit in the RAM and then store it in an external TF storage unit; The power management unit includes an LDO1 power management unit, an LDO2 power management unit and a supercapacitor charging unit, wherein the input end of the LDO1 power management unit is connected to a power supply, the output end of the LDO1 power management unit is connected to an MCU control unit, the input end of the LDO2 power management unit is connected to a power supply, and the output end of the LDO1 power management unit and the supercapacitor charging unit are connected to the MCU control unit for supplying power to the MCU control unit and the display unit.
2. A seat signal acquisition and storage circuit as claimed in claim 1, characterized in that: The supercapacitor charging unit includes a supercapacitor C21, a first resistor R20, a first diode D8, a second resistor R19, a transistor Q2, a third resistor R18 and a field effect transistor U6. One end of the supercapacitor C21 is connected to the LDO2 power management unit in sequence with the first resistor R20 and the first diode D8, the other end of the supercapacitor C21 is connected to one end of the second resistor R19, the other end of the second resistor R19 is connected to the collector of the transistor Q2, the base of the transistor Q2 and the third resistor R18 are connected to the corresponding POWCTRL judgment signal end on the MCU control unit, the emitter of the transistor Q2 is grounded, and the other end of the supercapacitor C21 is connected to the field effect transistor U6 and the MCUPOW power signal end corresponding to the LDO1 power management unit, and the seat-related signals are cached in the Flash according to the status signal pair, thereby starting the supercapacitor C21 to supply power to the MCU control unit through the LDO1 power management unit to complete the storage task.
3. The seat signal acquisition and storage circuit according to claim 1, characterized in that: The LDO1 power management unit includes a voltage stabilizing circuit U7, a first capacitor C22, a second capacitor C23, a third capacitor C24 and a fourth capacitor C25. The IN end of the voltage stabilizing circuit U7 is connected to the corresponding MCUPOW power signal end on the supercapacitor charging unit, the first capacitor C22 and the second capacitor C23 connected in parallel and grounded, the TAB end of the voltage stabilizing circuit U7 is connected to a 3.3V power supply, and the OUT end of the voltage stabilizing circuit U7 is connected to the 3.3V power supply with the third capacitor C24 and the fourth capacitor C25 connected in parallel.
4. The seat signal acquisition and storage circuit according to claim 1, characterized in that: The LDO2 power management unit includes a DC-DC power chip U5, a thermistor R17, a second diode D5, a first capacitor C19, a second capacitor L2, a third capacitor C20, a fourth resistor R23, a transistor Q3 and a fifth resistor R33. The VIN end of the DC-DC power chip U5 and one end of the thermistor R17 are connected to a 12V power supply, and the VIN end of the DC-DC power chip U5 is respectively connected to the second diode D5 and the first capacitor C19 and grounded. The OUT end of the DC-DC power chip U5 is connected to one end of the second capacitor L2, and the OUT end of the second capacitor L2 is connected to the OUT end of the DC-DC power chip U5. The other end is connected to one end of the third capacitor C20, the other end of the third capacitor C20 is grounded, the FB end of the DC-DC power supply chip U5 is connected to one end of the fourth resistor R23, the other end of the fourth resistor R23 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the corresponding PCHK signal end on the MCU control unit, and the collector of the transistor Q3 is connected to the fifth resistor R33 with a 3.3V power supply, which is used to charge the super capacitor C21 when working and output the PCHK signal to the MCU chip to determine whether the power is in a power-off state.
5. The seat signal acquisition and storage circuit according to claim 1, characterized in that: The signal acquisition unit includes an isolated CAN transceiver U10, a LIN transceiver, a common mode containment unit and an analog quantity acquisition unit. The input end of the isolated CAN transceiver is connected to an external CAN bus, the output end of the isolated CAN transceiver and the output end of the LIN transceiver are respectively connected to the input end of the common mode containment unit, and are connected to the MCU control unit through TX / RX signals; the external input analog signal is connected to the input end of the acquisition unit, and the output end of the acquisition unit is connected to the input end corresponding to the AD analog port of the MCU control unit, wherein the common mode containment unit consists of a transient voltage suppressor ESD1 and a common mode inductor U8, the first port of the common mode inductor U8 is connected to one end of the transient voltage suppressor ESD1, the second port of the common mode inductor U8 is connected to the other end of the transient voltage suppressor ESD1, the third port of the common mode inductor U8 is connected to the CAN1 L signal end corresponding to the isolated CAN transceiver U10, and the fourth port of the common mode inductor U8 is connected to the CAN1 H signal end corresponding to the isolated CAN transceiver U10.
6. A seat signal acquisition and storage circuit as claimed in claim 5, characterized in that: The analog quantity acquisition unit includes a plurality of attenuators, each of which includes a connector, a sixth resistor, a seventh resistor, a voltage-stabilizing diode and a fourth capacitor. The second port of the connector is grounded, the first port of the connector is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the negative electrode of the voltage-stabilizing diode, the positive electrode of the voltage-stabilizing diode is grounded, and the other end of the sixth resistor is connected to one end of the seventh resistor and grounded, while the other end of the sixth resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to the other end of the seventh resistor and grounded.
7. The seat signal acquisition and storage circuit according to claim 1, characterized in that: The display unit includes an HMI button unit and an LCD display, the output end of the HMI button unit is connected to the input end of the MCU control unit, and the input end of the LCD display is connected to the output end of the MCU control unit for HMI interaction and signal status display.
8. The seat signal acquisition and storage circuit according to claim 1, characterized in that: The MCU control unit adopts the STM32H750 chip.
9. A seat signal acquisition and storage device, characterized in that: The device comprises the seat signal acquisition and storage circuit according to any one of claims 1 to 8.
10. A seat signal collection and storage terminal, characterized in that: The terminal includes the seat signal acquisition and storage circuit according to any one of claims 1 to 8.