CN115946623A

CN115946623A - Instrument display device convenient to installation and working circuit thereof

Info

Publication number: CN115946623A
Application number: CN202211578065.5A
Authority: CN
Inventors: 夏生福
Original assignee: Chongqing Delco Electronic Instrument Co ltd
Current assignee: Chongqing Delco Electronic Instrument Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-04-11
Anticipated expiration: 2042-12-09
Also published as: CN115946623B

Abstract

The invention discloses an instrument display device convenient to install and a working circuit thereof, wherein the instrument display device comprises a glass cover plate, a liquid crystal screen, a support, a PCB (printed Circuit Board) and a rear shell, wherein L-shaped clips are arranged on the left and right sides of the top of the support at intervals, the L-shaped clips are positioned above the rear shell, installation support lugs are arranged on the left and right sides of the bottom of the support at intervals, installation holes are formed in the installation support lugs, the installation support lugs are installed on an automobile body in a matched manner with installation bolts, the installation support lugs are positioned below the rear shell, and the bottom ends of the installation support lugs are inclined backwards and extend; the concave glass mounting groove that is used for installing the glass apron that is equipped with in front of support, the tank bottom of glass mounting groove is concave to be equipped with the screen mounting groove that is used for installing LCD screen, and seal the notch of screen mounting groove through the glass apron, be equipped with the leaded light hole on the position that the support corresponds the glass mounting groove, be equipped with the leaded light post in the leaded light hole, the rear of leaded light post is stretched to one side of PCB board, and be equipped with light sensor U13, carry out the leaded light for light sensor U13 through the leaded light post. The installation is quick, convenient, stable and reliable.

Description

Instrument display device convenient to installation and working circuit thereof

Technical Field

The invention relates to the technical field of automobile instruments, in particular to an instrument display device convenient to install and a working circuit thereof.

Background

The automobile instrument display device is a device for reflecting the working condition of each system of the vehicle; the common display contents include a fuel indicator lamp, a cleaning liquid indicator lamp, an electronic throttle indicator lamp, front and rear fog lamp indicator lamps, an alarm lamp and the like. Common automobile instruments are all that the back of backshell sets up the mounting structure that is used for assembling to the automobile body, or through the mounting means of buckle joint or bolt. Because the mounting structure is positioned on the back surface of the rear shell and is blocked by the rear shell, a sight blind area exists, and the mounting is inconvenient. Therefore, there is a high necessity for an instrument display device that is easy to install.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art, and particularly innovatively provides an instrument display device convenient to mount and a working circuit thereof, which are convenient to mount and stable in structure.

In order to achieve the purpose, the invention provides an instrument display device convenient to mount, which comprises a glass cover plate, a liquid crystal display screen, a support, a PCB and a rear shell, wherein the glass cover plate, the liquid crystal display screen, the support, the PCB and the rear shell are sequentially arranged from front to back;

the front side of the bracket is concavely provided with a glass mounting groove for mounting a glass cover plate, the bottom of the glass mounting groove is concavely provided with a screen mounting groove for mounting a liquid crystal screen, the notch of the screen mounting groove is sealed by the glass cover plate, and a separation frame for supporting the back of the liquid crystal screen is arranged in the screen mounting groove so as to separate the liquid crystal screen from the bottom of the screen mounting groove;

the support is provided with a light guide hole corresponding to the glass mounting groove, a light guide column is arranged in the light guide hole, one side of the PCB extends to the rear part of the light guide column and is provided with a light sensor U13 used for sensing external light of an instrument, light is guided for the light sensor U13 through the light guide column, the rear side of the support is provided with a plurality of first positioning clamping columns used for mounting and positioning the rear shell along the circumferential direction of the support, the PCB is provided with first abdicating notches corresponding to the first positioning clamping columns, the rear shell is provided with second positioning clamping columns corresponding to the first positioning columns, and the first positioning clamping columns are provided with clamping holes which are used for clamping the second positioning clamping columns and extend forwards and backwards; the second positioning clamping column is clamped on the first positioning clamping column.

In the scheme, the method comprises the following steps: the spacer includes the vertical overlap joint pole that controls the interval setting and is used for linking together all vertical overlap joint poles horizontal pole, the upper and lower both ends of overlap joint pole are all installed on the inside wall of screen mounting groove, both ends are also installed on the inside wall of screen mounting groove about the horizontal pole, and the front side of all overlap joint poles all is equipped with the draw-in groove that is used for the card to go into the horizontal pole for the horizontal pole flushes with the front side of overlap joint pole, it is equipped with vertical extension's locating lever still to integrate into one piece on the horizontal pole, the horizontal pole is the cross with the locating lever and distributes, and the front side of arbitrary overlap joint pole is equipped with the constant head tank that is used for the card to go into the locating lever.

In the scheme, the method comprises the following steps: the first positioning clamping column and the second positioning clamping column are both in a [ -shape, openings of the two [ -shapes are oppositely arranged when the first positioning clamping column and the second positioning clamping column are clamped, and a clamping hole is formed in a space surrounded by the [ -shapes.

In the scheme, the method comprises the following steps: first location card post is three, sets up respectively and leans on left side, right side and the top setting of support, is close to the leaded light post setting first location card post sets up at the middle part of PCB board, and all the other two first location card posts lean on the edge setting of PCB board.

In the scheme, the method comprises the following steps: the three mounting lugs are arranged from left to right, the mounting lug arranged in the middle is lower than the mounting lugs on the left side and the right side, the mounting lugs on the left side and the right side are symmetrically arranged along the vertical central line of the instrument, the bottom of the rear shell is provided with a second abdicating notch for abdicating the mounting lugs on the left side and the right side,

the invention also provides a working circuit of the instrument display device, which comprises the instrument display device of the scheme and an MCU, wherein the MCU wake-up signal input end is connected with one end of the wake-up circuit, and the other end of the wake-up circuit is connected with the wiring bar P1 and is connected with the wake-up signal output end of the automobile host through the wiring bar P1; the light detection signal input end of the MCU is connected with the detection signal output end of the optical sensor U13, the backlight adjustment signal output end of the MCUTFT is connected with the backlight signal input end of the LED driver U6, and the adjustment output end of the LED driver U6 is connected with the adjustment signal input end of the FPC2 of the connector;

the image signal transmission circuit comprises a deserializer U5, an image signal input end of the deserializer U5 is connected with a second wiring bank J1, the second wiring bank J1 is used for connecting an image signal output end of an automobile host, an image signal output end of the deserializer U5 is connected with an image signal input end of an OSD chip U10, and an image signal output end of the OSD chip U10 is connected with an image signal input end of a connector FPC 1;

still include supply circuit, supply circuit power input one end connection row P1, connect external power source through row P1 of working a telephone switchboard, fourth step-down circuit voltage input end is connected to the first feed end of supply circuit's power, first step-down circuit voltage input end is connected to supply circuit's power second feed end, second step-down circuit voltage input end and third step-down circuit voltage input end are connected to first step-down circuit voltage output end.

In the scheme, the method comprises the following steps: the power supply circuit comprises a first wiring bar P1, wherein the first end of the first wiring bar P1 is connected with one end of a transient suppression diode TVS1, one end of a capacitor C2, the anode of a diode D2 and the anode of the diode D1, the first end of the first wiring bar P1 is used for being connected with an external power supply, the other end of the capacitor C2 is connected with a power ground, the other end of the transient suppression diode TVS1 is connected with the second end of the first wiring bar P1, the second end of the first wiring bar P1 is used for being connected with the power ground, the cathode of the diode D2 is connected with the cathode of the diode D1, one end of a capacitor C4, one end of a capacitor C3 and one end of an inductor L1, and the other end of the capacitor C4 and the other end of the capacitor C3 are both connected with the power ground; one end of an inductor L1 is a first power supply end of a power supply, the other end of the inductor L1 is a second power supply end of the power supply, the other end of the inductor L1 is connected with one end of a capacitor C13 and the anode of a diode D11, the other end of the capacitor C13 is connected with a power ground, the cathode of the diode D11 is connected with a voltage input end of a voltage stabilizer U1, one end of a capacitor C4, one end of a capacitor C10 and one end of a resistor R4, the other end of the capacitor C4 and the other end of the capacitor C10 are connected with the power ground, the other end of the resistor R4 is connected with an enabling end of the voltage stabilizer U1, the voltage output end of the voltage stabilizer U1 outputs 3.3V voltage to supply power to the MCU, the voltage output end of the voltage stabilizer U1 is connected with one end of the capacitor C11 and one end of a capacitor C27, and the other end of the capacitor C11 and the other end of the capacitor C27 are connected with the power ground; the reset end of the voltage stabilizer U1 is connected with one end of a resistor R15, the fault end of the voltage stabilizer U1 is connected with one end of a resistor R16, and the other end of the resistor R15 and the other end of the resistor R16 are both connected with the MCU reset signal input end; the reset delay end of the voltage stabilizer U1 is connected with one end of a capacitor C12, the other end of the capacitor C12 is connected with a power ground, the ROSC end of the voltage stabilizer U1 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with the power ground;

the negative electrode of the diode D1 is connected with one end of a resistor R126, the other end of the resistor R126 is connected with one end of a resistor R1 and one end of a resistor R144, the other end of the resistor R126 is connected, the other end of the resistor R1 is connected with one end of a resistor R2 and the first end of the MCU power supply sampling, the other end of the resistor R2 is connected with one end of a capacitor C1 and the power ground, and the other end of the capacitor C1 is connected with the other end of the resistor R1; the other end of the resistor R144 is connected with one end of a resistor R143, and the other end of the resistor R143 is connected with one end of a resistor R145 and a second end of the MCU power supply sampling; the other end of the resistor R145 is connected with one end of a capacitor C150 and the power ground, and the other end of the capacitor C150 is connected with one end of the resistor R145;

the first voltage reduction circuit comprises a voltage reduction DC-DC converter enabling signal input end, a resistor R26 end and a resistor R28 end, the other end of the resistor R28 is connected with a power ground, the other end of the resistor R26 is connected with an MCU working voltage power supply enabling output end, the voltage reduction DC-DC converter voltage input end is connected with a second power supply end of a power supply, one end of a capacitor C28, one end of a capacitor C29 and one end of a capacitor C30, and the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all connected with the power ground; the BOOT end of the voltage reduction DC-DC converter is connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of a capacitor C25, the other end of the capacitor C25 is connected with one end of a resistor R24, the other end of the resistor R24 is connected with one end of a capacitor C26, and the other end of the capacitor C26 is connected with the power ground; the output end of a switch of the voltage reduction DC-DC converter is connected with one end of an inductor L3, the cathode of a diode D7 and one end of a resistor R24, the other end of the inductor L3 outputs 3.3V power supply voltage for supplying power to a deserializer U5, an MSPI communication interface U11, an LCD power supply chip U7 and an optical sensor U13, the other end of the inductor L3 is connected with one end of a capacitor C32, one end of a capacitor C33, one end of a capacitor C34 and one end of a capacitor C31, and the other end of the capacitor C32, the other end of the capacitor C33, the other end of the capacitor C34, the other end of the capacitor C31 and the anode of the diode D7 are connected with a power ground;

the other end of the inductor L3 is connected with one end of a resistor R77, the other end of the resistor R77 is connected with a first step-down sampling signal input end of the MCU, one end of a resistor R78 and one end of a capacitor C114, and the other end of the resistor R78 and the other end of the capacitor C114 are connected with a power ground;

the other end of the inductor L3 is connected with one end of a filter L17, and the other end of the filter L17 outputs 3.3V voltage for supplying power to an OSD chip U10;

the inverting input of the voltage reduction DC-DC converter is connected with one end of a resistor RFBB1 and one end of a resistor RFBT1, the other end of the resistor RFBB1 is connected with a power ground, the other end of the resistor RFBT1 is connected with one end of a resistor RFBT2, and the other end of the resistor RFBT2 is connected with the other end of a inductor L3;

the oscillation end of the voltage reduction DC-DC converter is connected with one end of a resistor R29, the other end of the resistor R29 is connected with a power ground, the starting time end of the voltage reduction DC-DC converter is connected with one end of a resistor R27 and one end of a capacitor C36, the other end of the resistor R27 is connected with one end of a capacitor C35, and the other end of the capacitor C35 and the other end of the capacitor C36 are connected with the power ground;

the second voltage reduction circuit comprises a voltage input end of a voltage stabilizer U4, the other end of an inductor L3, one end of a resistor R30 and one end of a capacitor C37, the other end of the resistor R30 is connected with an enabling signal input end of the voltage stabilizer U4 and one end of a resistor R32, the other end of the capacitor C37 and the other end of the resistor R32 are both connected with a power ground, a voltage output end of the voltage stabilizer U4 outputs 1.2V working voltage for supplying power to the deserializer, the voltage stabilizer is connected with one end of a resistor RFBT3, a normally-opened end of the voltage stabilizer U4, one end of a capacitor C38, one end of a resistor R31 and one end of a resistor R79, the other end of the resistor RFBT3 is connected with a feedback voltage input end of the voltage stabilizer U4 and one end of a resistor RFBB2, the other end of the capacitor C38 and the other end of the resistor R31 are all connected with the power ground, the other end of the resistor R79 is connected with a second voltage reduction sampling signal input end of the MCU, one end of a resistor R167 and one end of a capacitor C115, and the other end of the capacitor C115 are both connected with the power ground;

the third voltage reduction circuit comprises a voltage input end of a voltage stabilizer U12, wherein the voltage input end of the voltage stabilizer U12 is connected with the other end of an inductor L3, one end of a resistor R89 and one end of a capacitor C127, the other end of the resistor R89 is connected with an enabling signal input end of the voltage stabilizer U12 and one end of a resistor R91, the other end of the capacitor C127 and the other end of the resistor R91 are both connected with a power ground, a voltage output end of the voltage stabilizer U12 outputs 1.5V working voltage for supplying power to the deserializer, and is connected with one end of a resistor RFBT6, a normally-opened end of the voltage stabilizer U12, one end of a capacitor C128 and one end of a resistor R90, the other end of the resistor RFBT6 is connected with a feedback voltage input end of the voltage stabilizer U12 and one end of a resistor RFBB4, and the other ends of a resistor RFBB4, the capacitor C128 and the resistor R90 are all connected with the power ground;

the voltage output end of the voltage stabilizer U12 is connected with one end of a filter L18, the other end of the filter L18 outputs 1.5V voltage for supplying power to an OSD chip U10, the other end of the filter L18 is connected with one end of a resistor R168, the other end of the resistor R168 is connected with a MCUOSD1.5 power supply sampling signal input end, one end of a resistor R169 and one end of a capacitor C116, and the other end of the resistor R169 and the other end of the capacitor C116 are both connected with a power ground;

the fourth voltage reduction circuit comprises a voltage input end of a CAN power supply chip U9 connected with a first power supply end of a power supply and one end of a capacitor C26, one end of the capacitor C126 and a grounding end of the CAN power supply chip U9 are both connected with a power ground, a voltage output end of the CAN power supply chip U9 outputs 5V voltage for supplying power to a CAN transceiver U8, a voltage output end of the CAN power supply chip U9 is connected with one end of a capacitor C125, the other end of the capacitor C125 is connected with the power ground, a reset output end of the CAN power supply chip U9 is connected with one end of a resistor R53, the other end of the resistor R53 is connected with one end of a resistor R52 and a power supply fault signal input end of the MCUCAN, and the other end of the resistor R52 is connected with a voltage output end of a voltage stabilizer U1; CAN power supply chip U9 time delay reset end connecting capacitor C _ss 1 terminal, a capacitor C _ss The other end of 1 is connected with the power ground.

In the scheme, the method comprises the following steps: the first end of the second line bank J1 is connected with the first end of the filter L11 and one end of the ESD suppressor ESD5, and the other end of the ESD suppressor ESD5 is connected with the power ground; the third end of the second wiring bank J1 is connected with the second end of the filter L11 and one end of an ESD suppressor ESD6, and the other end of the ESD suppressor ESD6 is connected with a power ground; the third end of the filter L11 is connected with one end of a capacitor C73, the other end of the capacitor C73 is connected with the second RIN anode end of the deserializer U5, the fourth end of the filter L11 is connected with one end of a capacitor C74, and the other end of the capacitor C74 is connected with the second RIN cathode end of the deserializer U5; the second end of the second wire bank J1 is connected with the first end of the filter L10 and one end of the ESD suppressor ESD4, and the other end of the ESD suppressor ESD4 is connected with the power ground; the fourth end of the second connection bank J1 is connected with the second end of the filter L10 and one end of the ESD suppressor ESD3, and the other end of the ESD suppressor ESD3 is connected with a power ground; the third end of the filter L10 is connected with one end of a capacitor C71, the other end of the capacitor C71 is connected with the first RIN anode end of the deserializer U5, the fourth end of the filter L10 is connected with one end of a capacitor C72, and the other end of the capacitor C72 is connected with the first RIN cathode end of the deserializer U5;

the MCULVDS enable signal output end is connected with one end of a resistor R43, the other end of the resistor R43 is connected with one end of a resistor R41, one end of the resistor R42 is used for selecting a BIST clock of the deserializer U5, the other end of the resistor R41 is connected with one end of a resistor R39 and an internal working voltage output end of the deserializer U5, the other end of the resistor R39 is connected with one end of a resistor R40 and the BIST enable signal output end of the deserializer U5, and the other end of the resistor R40 and the other end of the resistor R42 are connected with a power ground;

the MCULVDSI2C bus data signal transmission end is connected with one end of a resistor R128, and the other end of the resistor R128 is connected with one end of a resistor R46 and a deserializer U5LVDSI2C bus data signal transmission end; the MCULVDSI2C bus clock signal transmission end is connected with one end of a resistor R127, and the other end of the resistor R127 is connected with one end of a resistor R45 and a deserializer U5LVDSI2C bus clock signal transmission end; the other end of the resistor R46 and the other end of the resistor R45 are connected with an internal working voltage output end; the MCULVDS power-saving mode output end is connected with one end of a resistor R48, the other end of the resistor R48 is connected with the anode of a diode D8, one end of a resistor R44 and a power-saving mode input pin of a deserializer U5, and the cathode of the diode D8 and the other end of the resistor R44 are connected with an internal working voltage output end of the deserializer U5;

the MCULVDS backlight enable signal output end is connected with one end of a resistor R51, and the other end of the resistor R51 is connected with a deserializer U5LVDS backlight enable signal input end; the MCULVDS backlight PWM signal output end is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with a deserializer U5LVDS backlight PWM signal input end; the MCULVDS backlight PWM signal output end is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with a deserializer U5LVDS backlight PWM signal input end; the MCULVDS first general signal transmission end is connected with one end of a resistor R57, and the other end of the resistor R57 is connected with a first general signal transmission end of a deserializer U5 LVDS; the MCULVDS second universal signal transmission end is connected with one end of a resistor R58, and the other end of the resistor R58 is connected with a second universal signal transmission end of the deserializer U5 LVDS; the locking state output end of the deserializer U5 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with the locking state input end of the MCULVDS, the deserializer U5 is connected with one end of a resistor R50 through a state output end, and the other end of the resistor R50 is connected with the MCULVDS through a state input end;

the deserializer U5TFTOLV signal transmission line is connected with a first filter bank TFTOLV signal input end, a first filter bank TFTOLV signal output end is connected with an OSD chip U10TFTOLV signal input line, an OSD chip U10TFTOLV signal output line is connected with an FPC1TFTOLV signal input line, the deserializer U5TFTELV signal transmission line is connected with a second filter bank TFTELV signal input end, a second filter bank TFTELV signal output end is connected with an OSD chip U10TFTELV signal input line, and an OSD chip U10TFTELV signal output line is connected with an FPC1TFTELV signal input line; the other end of the resistor R96 is connected with the data signal input end of the connector FPC1, the MCUTFT enabling signal output end is connected with one end of the resistor R99, the other end of the resistor R99 is connected with the enabling signal input end of the connector FPC1, the other end of the resistor R101 is connected with the resetting signal input end of the connector FPC1, the MCUTFT switch signal transmission end is connected with one end of the resistor R106, the other end of the resistor R106 is connected with one end of the connector FPC1 switch signal transmission end and one end of the resistor R108, and the other end of the resistor R108 is connected with a power ground; the MCUTFT fault signal transmission end is connected with one end of a resistor R111, the other end of the resistor R111 is connected with the fault signal transmission end of a connector FPC1 and one end of a resistor R112, and the other end of the resistor R112 is connected with a power ground;

the voltage input end of an LED driver U6 is connected with a second power supply end of a power supply, one end of an inductor L12, one end of a capacitor C84, one end of a capacitor C85 and one end of a capacitor C86, the other end of the capacitor C84, the other end of the capacitor C85 and the other end of the capacitor C86 are connected with a power ground, the enabling signal input end of the LED driver U6 is connected with one end of a resistor R60, the other end of the resistor R60 is connected with the MCUTFT backlight enabling signal output end, the PWM signal input end of the LED driver U6 is connected with one end of a resistor R64, and the other end of the resistor R64 is connected with the MCUTFT backlight PWM signal output end; the working voltage output end of the LED driver U6 is connected with one end of a resistor R66, one end of a resistor R65 and the cathode of a diode D10, the anode of the diode D10 and one end of the resistor R65 are both connected with one end of a capacitor C92, and the other end of the capacitor C92 is connected with a power ground; the other end of the resistor R66 is connected with a fault end of the LED driver U6 and one end of the resistor R70, and the other end of the resistor R70 is connected with an MCUTFT backlight fault signal output end;

the other end of the inductor L12 is connected with a voltage output end of the LED driver U6, the anode of the diode D9 and one end of the resistor R59, the other end of the resistor R59 is connected with one end of the capacitor C83, and the other end of the capacitor C83 is connected with a power ground; the negative electrode of the diode D9 is a TFT backlight power supply end; the other end of the resistor R172 is connected with one end of a resistor R173, one end of a capacitor C151 and the input end of an MCUTFT backlight power supply sampling signal, and the other end of the resistor R173 and the other end of the capacitor C151 are connected with the power ground;

a first backlight signal output end of an LED driver U6 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with a first backlight signal input end of a connector FPC2, a second backlight signal output end of the LED driver U6 is connected with one end of a resistor R110, the other end of the resistor R110 is connected with a second backlight signal input end of the connector FPC2, a third backlight signal output end of the LED driver U6 is connected with one end of a resistor R113 and one end of a resistor R174, the other end of the resistor R113 is connected with a third backlight signal input end of the connector FPC2, the other end of the resistor R174 is connected with one end of a resistor R175, one end of a capacitor C152 and a third backlight PWM signal sampling end of an MCU, a fourth backlight signal output end of the LED driver U6 is connected with one end of a resistor R114 and one end of a resistor R176, the other end of the resistor R114 is connected with a fourth backlight signal input end of the connector FPC2, and the other end of the resistor R176 is connected with one end of a resistor R177, one end of a capacitor C153 and a fourth backlight PWM signal sampling end of the MCU; an MCUTFT backlight enabling signal output end is connected with one end of a resistor R107, the other end of the resistor R107 is connected with one end of a resistor R109, one end of a capacitor C105 and a base electrode of a triode Q4, an emitting electrode of the triode Q4, the other end of the resistor R109 and the other end of the capacitor C105 are connected with a power ground, a collecting electrode of the triode Q4 is connected with one end of a resistor R104, the other end of the resistor R104 is connected with one end of a capacitor C100, one end of a resistor R102 and a base electrode of the triode Q3, the emitting electrode of the triode Q3 and the other end of the resistor R102 are both connected with a voltage output end of a voltage stabilizer U1, a collecting electrode of the triode Q3 is connected with the other end of the capacitor C100, one end of a capacitor C101 and one end of a resistor R100, the other end of the capacitor C101 is connected with the power ground, one end of the resistor R100 is connected with one end of a resistor R98 and a connector FPC2TFT backlight enabling signal input end, the other end of the resistor R98 is connected with one end of a capacitor C99 and an MCUTFTNTC sampling end, and the other end of the capacitor C99 is connected with the power ground;

the MCUSPI communication initial signal output end is connected with an OSD chip U10SPI communication initial signal input end, the MCUSPI communication signal output end is connected with an OSD chip U10SPI communication signal input end, the MCUSPI communication signal input end is connected with an OSD chip U10SPI communication signal output end, the MCUSPI communication clock signal transmission end is connected with an OSD chip U10SPI communication clock signal transmission end, the MCUOSD reset output end is connected with one end of a resistor R136, the other end of the resistor R136 is connected with one end of a resistor R135, one end of a capacitor C141 and the OSD chip U10 reset signal input end, the other end of the resistor R135 is connected with the other end of an inductor L3, the other end of the capacitor C141 is connected with a power ground, the MCUOSD fault signal input end is connected with one end of a resistor R138, the other end of the resistor R138 is connected with one end of a resistor R137 and the fault signal input end of the OSD chip U10, and the other end of the resistor R137 is connected with the other end of the inductor L3;

the communication signal transmission end of an OSD chip U10MSPI communication clock is connected with one end of a resistor R133, the other end of the resistor R133 is connected with the clock signal transmission end of an MSPI communication interface U11, the communication initial signal output end of the OSD chip U10MSPI is connected with one end of a resistor R132, the other end of the resistor R132 is connected with the initial signal output end of the MSPI communication interface U11, the communication signal input end of the OSD chip U10MSPI is connected with one end of a resistor R131, the other end of the resistor R131 is connected with the communication signal output end of the MSPI communication interface U11, the communication signal output end of the OSD chip U10MSPI is connected with one end of a resistor R134, and the other end of the resistor R134 is connected with the communication signal input end of the MSPI communication interface U11; the MSPI communication interface U11 has a working voltage input end connected with one end of an inductor L16, one end of a capacitor C129 and one end of a capacitor C130, and the other end of the inductor L16 is connected with the other end of an inductor L3.

In the scheme, the method comprises the following steps: the wake-up circuit comprises a third end of the first wiring bar P1, a third end of the first wiring bar P1 is connected with one end of an ESD suppressor ESD1B, one end of a capacitor C5 and the anode of a diode D3, the third end of the first wiring bar P1 is used for being connected with an automobile ignition signal input end, the other end of the ESD suppressor ESD1B and one end of the capacitor C5 are both connected with a power ground, the cathode of the diode D3 is connected with one end of a resistor R80, the other end of the resistor R80 is connected with one end of a resistor R81, one end of a capacitor C117 and a base electrode of a triode Q6, the other end of the resistor R81, the other end of the capacitor C117 and an emitter electrode of the triode Q6 are all connected with the power ground, a collector electrode of the triode Q6 is connected with an enabling end of a watchdog U1 of a voltage stabilizer and one end of a resistor R17, and the other end of the resistor R17 is connected with the power ground; the voltage input end of the voltage stabilizer U1 is connected with the resistor R13, and the other end of the voltage stabilizer U1 is connected with the voltage output end of the voltage stabilizer U1;

diode D3 negative pole is connected resistance R10 one end still, resistance R10 other end connecting resistance R11 one end, electric capacity C9 one end and triode Q2 base, the resistance R11 other end, the electric capacity C9 other end and triode Q2 projecting pole all connect power ground, triode Q2 collecting electrode connecting resistance R9 one end, triode Q1 base and resistance R8 one end are connected to the resistance R9 other end, stabiliser U1 voltage output end and triode Q1 projecting pole are connected to the resistance R8 other end, triode Q1 collecting electrode connecting resistance R7 one end, electric capacity C8 one end and MCU wake-up signal input end, the resistance R7 other end and the electric capacity C8 other end all connect power ground.

In the scheme, the method comprises the following steps: the voltage input end of the LCD power supply chip U7 is connected with the other end of the inductor L3, one end of the capacitor C109 and one end of the capacitor C110, the other end of the capacitor C109, the other end of the capacitor C110 and the grounding end of the LCD power supply chip U7 are connected with a power ground, the enable signal input end of the LCD power supply chip U7 is connected with one end of a resistor R123 and one end of a resistor R121, the other end of the resistor R121 is connected with the power ground, the other end of the resistor R123 is connected with the MCULCD power supply enable signal output end, the voltage output end of the LCD power supply chip U7 outputs 3.3V voltage for supplying power to the LCD, the voltage output end of the LCD power supply chip U7 is connected with one end of a resistor R22 and one end of a capacitor C111, the other end of the capacitor C111 is connected with the power ground, the fault output end of the LCD power supply chip U7 is connected with one end of the resistor R122, one end of the resistor R124 and one end of the capacitor C112, the other end of the resistor R124 is connected with the power supply fault signal input end of the MCULCD, and the other end of the capacitor C112 is connected with the power ground.

In the scheme, the method comprises the following steps: the light sensor U13 working voltage input end is connected with a voltage output end of a voltage stabilizer U1, one end of a capacitor C148 and one end of a capacitor C149, the other end of the capacitor C148 and the other end of the capacitor C149 are connected with a power ground, the light sensor U13 reference resistor end is connected with one end of a resistor R141, the other end of the resistor R141 and the grounding end of a light sensor U13 are connected with the power ground, a signal output end of the light sensor U13 is connected with one end of a resistor R142 and one end of a resistor R54, the other end of the resistor R142 is connected with a light detection signal input end of an MCU, a clock end of the light sensor U13 is connected with a light sensing clock signal end of the MCU and one end of a resistor R55, a data end of the light sensor U13 is connected with a light sensing data signal end of the MCU and one end of a resistor R146, and one ends of the resistor R54, the R55 and the other end of the resistor R146 are connected with a voltage output end of the voltage stabilizer U1.

In the scheme, the method comprises the following steps: the CAN bus connecting circuit comprises a CAN transceiver U8 working voltage input end connected with a CAN power supply chip U9 voltage output end and one end of a capacitor C120, the other end of the capacitor C120 is connected with a power ground, the low level end of the CAN transceiver U8 is connected with the third end of a filter L14 and one end of a resistor R82, the other end of the resistor R82 is connected with the second end of the filter L14, and the other end of the resistor R82 is connected with the seventh end of a first wiring bar P1; the high-level end of the CAN transceiver U8 is connected with the fourth end of the filter L14 and one end of a resistor R88, the other end of the resistor R88 is connected with the first end of the filter L14, the other end of the resistor R88 is connected with the sixth end of a first wiring row P1 and is connected with an automobile CAN bus through the seventh end and the sixth end of the first wiring row P1, the other end of the resistor R88 is connected with one end of a resistor R86, one end of a capacitor C123 and the first end of an ESD suppressor ESD7, the other end of the resistor R86 is connected with one end of a capacitor C122 and one end of a resistor R84, the other end of the resistor R84 is connected with the other end of a resistor R82, the other end of the resistor R82 is also connected with one end of a capacitor C121, and the other ends of the capacitor C121 and the capacitor C123 at the other end of the capacitor C122 are both connected with a power ground;

the transmitting end of the CAN transceiver U8 is connected with one end of a resistor R83, the other end of the resistor R83 is connected with the MCUCAN signal transmitting end, the receiving end of the CAN transceiver U8 is connected with one end of a resistor R85, the other end of the resistor R85 is connected with the MCUCAN signal receiving end, the standby end of the CAN transceiver U8 is connected with one end of a resistor R87 and the MCUCAN standby end, and the other end of the resistor R87 and the grounding end of the CAN transceiver are both connected with a power ground.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: the L type checkpost and the installation journal stirrup that set up are located the upper and lower both sides of backshell respectively, can not be kept off by the backshell, adopt L type checkpost to fix a position in advance, carry out the bolt mounting through the installation journal stirrup on automobile body, the equipment is quick, convenient, reliable and stable. And L type checkpost and installation journal stirrup all set up on the support, all fix on the support to the most important PCB board of instrument display device and LCD screen, and non-fixed on the backshell, can improve the stability of being connected of PCB board and LCD screen and automobile body. The light guide hole and the light guide column that set up can be convenient for the light sensor U13 of PCB board detects external light source to adjust instrument display device's screen brightness, the function is various.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a system diagram of the circuit of the present invention;

FIG. 2 is a circuit diagram of the wiring block P1 connecting an external power source and a wake-up circuit;

FIG. 3 is a circuit diagram of a power supply circuit;

FIG. 4 is a circuit diagram of an MCU;

FIG. 5 is a circuit diagram of a first voltage step-down circuit;

FIG. 6 is a circuit diagram of a second voltage step-down circuit;

FIG. 7 is a circuit diagram of a deserializer;

fig. 8 is a circuit diagram of an LED driver;

FIG. 9 is a circuit diagram of an LCD power supply chip;

fig. 10 is a circuit diagram of the connector FPC 1;

fig. 11 is a circuit diagram of the connector FPC 2;

FIG. 12 is a circuit diagram of a CAN transceiver;

FIG. 13 is a circuit diagram of a CAN power chip;

fig. 14 is a circuit diagram of a third step-down circuit;

fig. 15 is a circuit diagram of a serializer;

FIG. 16 is a circuit diagram of an MSPI communication interface;

FIG. 17 is a circuit diagram of a light sensor;

FIG. 18 is a schematic view of the structure of a meter display device;

fig. 19 is a schematic view of the structure of the back surface of the rear case of the instrument display device;

fig. 20 is a schematic structural view of a stand and a liquid crystal screen of the instrument display device;

FIG. 21 is a schematic view of the structure of the stand and the spacer of the instrument display device;

fig. 22 is a schematic view of a structure of a bracket and a PCB board of the instrument display device;

fig. 23 is a schematic view of the structure inside the rear case of the instrument display device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in FIGS. 18 to 23, an instrument display device convenient for installation comprises a glass cover plate 1 and a liquid crystal screen 1 which are sequentially arranged from front to back _a A bracket 4, a PCB 5 and a rear shell 6, a glass cover plate 1 and a liquid crystal screen 1 _a Are sequentially installed at the front side of the bracket 4, and the PCB board 5 and the rear case 6 are sequentially installed at the rear side of the bracket 4. Wherein, the liquid crystal screen 1 _a Fixed on the back of the glass cover plate 1 to form a screen assembly. Two L-shaped clamps 3 used for clamping on an automobile body are arranged on the left and right sides of the top of the support 4 at intervals, the L-shaped clamps 3 are located above the rear shell 6, each L-shaped clamp 3 comprises a connecting plate extending front and back, the front end of each connecting plate is fixedly connected to the back of the top of the support 4, and a clamping block used for stretching into a clamping opening corresponding to the automobile body is vertically arranged at the rear end of each connecting plate. A plurality of installation lugs 2 used for being installed on the automobile body are arranged at the left and right sides of the bottom of the support 4 at intervals, installation holes are formed in the installation lugs 2, installation bolts are installed on the automobile body in a matched mode, the installation lugs 2 are located below the rear shell 6, and the bottom ends of the installation lugs 2 are inclined backwards and extend.

The front side of the bracket 4 is concavely provided with a glass mounting groove for mounting the glass cover plate 1, and the bottom of the glass mounting groove is concavely provided with a glass mounting groove for mounting the liquid crystal screen 1 _a And through a glass coverThe panel 1 closes the slot of the screen mounting slot. A screen mounting groove is internally provided with a liquid crystal screen 1 for supporting _a Spacers on the back side so that the liquid crystal screen 1 _a And the screen mounting groove is separated from the groove bottom of the screen mounting groove.

The part of the bracket 4 corresponding to the glass mounting groove is provided with a light guide hole 4 _e Light guide hole 4 _e Be equipped with the leaded light post in, the rear of leaded light post is stretched to one side of PCB board 5 to be equipped with the light sensor U13 that is used for the outside light of induction meter, carry out the leaded light for light sensor U13 through the leaded light post. The rear side of the bracket 4 is provided with a plurality of first positioning clamping columns 4d along the circumferential direction, which are used for installing and positioning the rear shell 6, and the PCB 5 is provided with first abdicating gaps 5 corresponding to the first positioning clamping columns 4d _a . A second positioning clamping column 6 is arranged on the rear shell 6 corresponding to the first positioning column _a The first positioning clamp column 4d is provided with a second positioning clamp column 6 _a Snap-in, forwardly and rearwardly extending snap-in holes. Second positioning clamp column 6 _a Is clamped on the first positioning clamping column 4 d.

The support 4 is provided with a through hole for the FPC1 and the FPC2 to pass through, the PCB 5 is electrically connected with the screen assembly through the FPC1 and the FPC2, and the PCB 5 is integrated with a working circuit of the instrument display device.

In the scheme, the method comprises the following steps: the separation frame comprises vertical lap joint rods 4 arranged at left and right intervals _a And for connecting all the vertical lap bars 4 _a Cross bars 4b, bridging bars 4 connected together _a The upper and lower ends of the cross rod 4b are arranged on the inner side wall of the screen mounting groove, the left and right ends of the cross rod 4b are also arranged on the inner side wall of the screen mounting groove, and all the lap-joint rods 4 _a The front sides of the cross rods are provided with clamping grooves for clamping the cross rods 4b, so that the cross rods 4b and the lapping rods 4 are connected _a Is flush with the front side of the frame, and a positioning rod 4 which extends vertically is also integrally formed on the cross rod 4b _c A cross bar 4b and a positioning bar 4 _c Is distributed in a cross shape, and any one overlapping rod 4 _a Is provided with a card for being clamped into the positioning rod 4 _c The positioning groove.

In the scheme, the method comprises the following steps: the first positioning clamping column 4d and the second positioning clamping column 6a are both in a [ -shape, and when the two [ -shapes are clamped, the openings of the [ -shapes are oppositely arranged, and the space surrounded by the [ -shapes is a clamping hole.

In the scheme, the method comprises the following steps: first location card post 4d is three, sets up left side, right side and the top setting by support 4 respectively, and the first location card post 4d that is close to the leaded light post setting sets up in the middle part of PCB board 5, and all the other two first location card posts 4d lean on the edge setting of PCB board 5.

In the scheme, the method comprises the following steps: the three mounting lugs 2 are arranged from left to right, the mounting lug 2 arranged in the middle is lower than the mounting lugs 2 on the left side and the right side, the mounting lugs 2 on the left side and the right side are symmetrically arranged along the vertical central line of the instrument, the bottom of the rear shell 6 is provided with a second abdicating notch for abdicating the mounting lugs 2 on the left side and the right side,

as shown in fig. 1 to 17, the working circuit of the instrument display device includes an MCUU2, an input end of a wake-up signal of the MCUU2 is connected to one end of the wake-up circuit, and the other end of the wake-up circuit is connected to a wiring row P1 and is connected to an output end of a wake-up signal of the host computer of the automobile through the wiring row P1; the light detection signal input end of the MCUU2 is connected with the detection signal output end of the optical sensor U13, the backlight adjustment signal output end of the MCUU2TFT is connected with the backlight signal input end of the LED driver U6, and the adjustment output end of the LED driver U6 is connected with the adjustment signal input end of the FPC 2;

the image signal transmission circuit comprises a deserializer U5, an image signal input end of the deserializer U5 is connected with a second wiring bar J1, the second wiring bar J1 is used for connecting an image signal output end of an automobile host, an image signal output end of the deserializer U5 is connected with an image signal input end of an OSD chip U10, and an image signal output end of the OSD chip U10 is connected with an image signal input end of a connector FPC 1;

the power supply circuit further comprises a power supply circuit, one end of the power supply input end of the power supply circuit is connected with the wiring bar P1, the power supply bar P1 is connected with an external power supply, the first power supply end of the power supply circuit is connected with the voltage input end of the fourth step-down circuit, the second power supply end of the power supply circuit is connected with the voltage input end of the first step-down circuit, the voltage output end of the first step-down circuit is connected with the voltage input end of the second step-down circuit and the voltage input end of the third step-down circuit, and the power supply output end, the wake-up circuit and the image signal transmission circuit are connected.

Specifically, the power supply circuit comprises a first wiring bar P1, a first capacitor C2, a diode D2 and a diode D1, wherein the first end of the first wiring bar P1 is connected with one end of a transient suppression diode TVS1, one end of a capacitor C2, the anode of the diode D2 and the anode of the diode D1, the first end of the first wiring bar P1 is used for being connected with an external power supply, the other end of the capacitor C2 is connected with a power ground, the other end of the transient suppression diode TVS1 is connected with the second end of the first wiring bar P1, the second end of the first wiring bar P1 is used for being connected with the power ground, the cathode of the diode D2 is connected with the cathode of the diode D1, one end of a capacitor C4, one end of a capacitor C3 and one end of an inductor L1, and the other ends of the capacitor C4 and the capacitor C3 are both connected with the power ground; one end of an inductor L1 is a first power supply end of a power supply, the other end of the inductor L1 is a second power supply end of the power supply, the other end of the inductor L1 is connected with one end of a capacitor C13 and the anode of a diode D11, the other end of the capacitor C13 is connected with the power supply ground, the cathode of the diode D11 is connected with a voltage input end of a voltage stabilizer U1, one end of a capacitor C4, one end of a capacitor C10 and one end of a resistor R4, the other end of the capacitor C4 and the other end of the capacitor C10 are connected with the power supply ground, the other end of the resistor R4 is connected with an enabling end of the voltage stabilizer U1, a voltage output end of the voltage stabilizer U1 outputs 3.3V voltage to supply power for the MCUU2, a voltage output end of the voltage stabilizer U1 is connected with one end of the capacitor C11 and one end of a capacitor C27, and the other end of the capacitor C11 and the other end of the capacitor C27 are connected with the power supply ground; the reset end of the voltage stabilizer U1 is connected with one end of a resistor R15, the fault end of the voltage stabilizer U1 is connected with one end of a resistor R16, and the other end of the resistor R15 and the other end of the resistor R16 are both connected with the MCUU2 reset signal input end; the reset delay end of the voltage stabilizer U1 is connected with one end of a capacitor C12, the other end of the capacitor C12 is connected with a power ground, the ROSC end of the voltage stabilizer U1 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with the power ground;

the cathode of the diode D1 is connected with one end of a resistor R126, the other end of the resistor R126 is connected with one end of a resistor R1 and one end of a resistor R144, the other end of the resistor R126 is connected, the other end of the resistor R1 is connected with one end of a resistor R2 and the first end of the MCUU2 power supply sampling, the other end of the resistor R2 is connected with one end of a capacitor C1 and the ground of a power supply, and the other end of the capacitor C1 is connected with the other end of the resistor R1; the other end of the resistor R144 is connected with one end of a resistor R143, and the other end of the resistor R143 is connected with one end of a resistor R145 and a second end of the MCUU2 power supply sampling; the other end of the resistor R145 is connected with one end of the capacitor C150 and the power ground, and the other end of the capacitor C150 is connected with one end of the resistor R145.

The first voltage reduction circuit comprises a voltage reduction DC-DC converter U3 enabling signal input end, a resistor R26 end and a resistor R28 end, the other end of the resistor R28 is connected with a power ground, the other end of the resistor R26 is connected with an MCUU2 working voltage power supply enabling output end, a voltage reduction DC-DC converter U3 voltage input end is connected with a second power supply end of a power supply, one end of a capacitor C28, one end of a capacitor C29 and one end of a capacitor C30, and the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all connected with the power ground; the BOOT end of the voltage reduction DC-DC converter U3 is connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of a capacitor C25, the other end of the capacitor C25 is connected with one end of a resistor R24, the other end of the resistor R24 is connected with one end of a capacitor C26, and the other end of the capacitor C26 is connected with a power ground; the output end of a switch of the voltage reduction DC-DC converter U3 is connected with one end of an inductor L3, the cathode of a diode D7 and one end of a resistor R24, the other end of the inductor L3 outputs 3.3V power supply voltage for supplying power to a deserializer U5, an MSPI communication interface U11, an LCD power supply chip U7 and a light sensor U13, the other end of the inductor L3 is connected with one end of a capacitor C32, one end of a capacitor C33, one end of a capacitor C34 and one end of a capacitor C31, and the other end of the capacitor C32, the other end of the capacitor C33, the other end of the capacitor C34, the other end of the capacitor C31 and the anode of the diode D7 are connected with a power ground;

the other end of the inductor L3 is connected with one end of a resistor R77, the other end of the resistor R77 is connected with a first voltage reduction sampling signal input end of the MCUU2, one end of a resistor R78 and one end of a capacitor C114, and the other end of the resistor R78 and the other end of the capacitor C114 are connected with a power ground;

the other end of the inductor L3 is connected with one end of a filter L17, and the other end of the filter L17 outputs 3.3V voltage for supplying power to an OSD chip U10; the other end of the filter L17 is connected with one end of a capacitor C131, one end of a capacitor C132, one end of a capacitor C133, one end of a capacitor C134, one end of a capacitor C135, one end of a capacitor C136, one end of a capacitor C137, one end of a capacitor C138, one end of a capacitor C139 and one end of a capacitor C140, and the other end of the capacitor C131, the other end of the capacitor C132, the other end of the capacitor C133, the other end of the capacitor C134, the other end of the capacitor C135, the other end of the capacitor C136, the other end of the capacitor C137, the other end of the capacitor C138, the other end of the capacitor C139 and the other end of the capacitor C140 are all connected with a power ground;

the inverting input of the voltage-reducing DC-DC converter U3 is connected with one end of a resistor RFBB1 and one end of a resistor RFBT1, the other end of the resistor RFBB1 is connected with a power ground, the other end of the resistor RFBT1 is connected with one end of a resistor RFBT2, and the other end of the resistor RFBT2 is connected with the other end of a inductor L3;

the oscillation end of the voltage-reducing DC-DC converter U3 is connected with one end of a resistor R29, the other end of the resistor R29 is connected with a power ground, the starting time end of the voltage-reducing DC-DC converter U3 is connected with one end of a resistor R27 and one end of a capacitor C36, the other end of the resistor R27 is connected with one end of a capacitor C35, and the other end of the capacitor C35 and the other end of the capacitor C36 are connected with the power ground;

the second voltage reduction circuit comprises a voltage input end of a voltage stabilizer U4, the other end of an inductor L3, one end of a resistor R30 and one end of a capacitor C37, the other end of the resistor R30 is connected with an enabling signal input end of the voltage stabilizer U4 and one end of a resistor R32, the other end of the capacitor C37 and the other end of the resistor R32 are both connected with a power ground, a voltage output end of the voltage stabilizer U4 outputs 1.2V working voltage for supplying power to the deserializer, the voltage stabilizer is connected with one end of a resistor RFBT3, a normally-opened end of the voltage stabilizer U4, one end of a capacitor C38, one end of a resistor R31 and one end of a resistor R79, the other end of the resistor RFBT3 is connected with a feedback voltage input end of the voltage stabilizer U4 and one end of a resistor RFBB2, the other end of the capacitor C38 and the other end of the resistor R31 are all connected with the power ground, the other end of the resistor R79 is connected with a second voltage reduction sampling signal input end of the MCUU2, one end of a resistor R167 and one end of a capacitor C115, and the other end of the capacitor C115 are both connected with the power ground.

The third voltage reduction circuit comprises a voltage input end of a voltage stabilizer U12, the other end of an inductor L3, one end of a resistor R89 and one end of a capacitor C127, the other end of the resistor R89 is connected with an enabling signal input end of the voltage stabilizer U12 and one end of a resistor R91, the other end of the capacitor C127 and the other end of the resistor R91 are both connected with a power ground, a voltage output end of the voltage stabilizer U12 outputs 1.5V working voltage which is used for supplying power to the deserializer and is connected with one end of a resistor RFBT6, a normally opened end of the voltage stabilizer U12, one end of a capacitor C128 and one end of a resistor R90, the other end of the resistor RFBT6 is connected with a feedback voltage input end of the voltage stabilizer U12 and one end of a resistor RFBB4, and the other ends of a resistor RFBB4, a capacitor C128 and the resistor R90 are all connected with the power ground;

the voltage output end of the voltage stabilizer U12 is connected with one end of a filter L18, the other end of the filter L18 outputs 1.5V voltage for supplying power to an OSD chip U10, the other end of the filter L18 is connected with one end of a resistor R168, the other end of the resistor R168 is connected with a MCUUU2OSD1.5 power supply sampling signal input end, one end of a resistor R169 and one end of a capacitor C116, and the other end of the resistor R169 and the other end of the capacitor C116 are both connected with a power ground.

The fourth voltage reduction circuit comprises a voltage input end of a CAN power supply chip U9 connected with a first power supply end of a power supply and one end of a capacitor C26, one end of the capacitor C126 and a grounding end of the CAN power supply chip U9 are both connected with a power ground, a voltage output end of the CAN power supply chip U9 outputs 5V voltage for supplying power to a CAN transceiver U8, a voltage output end of the CAN power supply chip U9 is connected with one end of a capacitor C125, the other end of the capacitor C125 is connected with the power ground, a reset output end of the CAN power supply chip U9 is connected with one end of a resistor R53, the other end of the resistor R53 is connected with one end of a resistor R52 and a power supply fault signal input end of the MCUCAN, and the other end of the resistor R52 is connected with a voltage output end of a voltage stabilizer U1; CAN power supply chip U9 time delay reset end connecting capacitor C _ss 1 terminal, capacitor C _ss The other end of 1 is connected with the power ground.

The first end of the second line bank J1 is connected with the first end of the filter L11 and one end of the ESD suppressor ESD5, and the other end of the ESD suppressor ESD5 is connected with a power ground; the third end of the second wiring bank J1 is connected with the second end of the filter L11 and one end of the ESD suppressor ESD6, and the other end of the ESD suppressor ESD6 is connected with the power ground; the third end of the filter L11 is connected with one end of a capacitor C73, the other end of the capacitor C73 is connected with the second RIN anode end of the deserializer U5, the fourth end of the filter L11 is connected with one end of a capacitor C74, and the other end of the capacitor C74 is connected with the second RIN cathode end of the deserializer U5; the second end of the second line bank J1 is connected with the first end of the filter L10 and one end of the ESD suppressor ESD4, and the other end of the ESD suppressor ESD4 is connected with the power ground; a fourth end of the second wiring bank J1 is connected with a second end of the filter L10 and one end of the ESD suppressor ESD3, and the other end of the ESD suppressor ESD3 is connected with a power ground; the third end of the filter L10 is connected with one end of a capacitor C71, the other end of the capacitor C71 is connected with the first RIN anode end of the deserializer U5, the fourth end of the filter L10 is connected with one end of a capacitor C72, and the other end of the capacitor C72 is connected with the first RIN cathode end of the deserializer U5;

an enable signal output end of the MCUU2LVDS is connected with one end of a resistor R43, the other end of the resistor R43 is connected with one end of a resistor R41, one end of the resistor R42 is selected by a deserializer U5BIST clock, the other end of the resistor R41 is connected with one end of a resistor R39 and an internal working voltage output end of the deserializer U5, the other end of the resistor R39 is connected with one end of a resistor R40 and the BIST enable signal output end of the deserializer U5, and the other end of the resistor R40 and the other end of the resistor R42 are connected with a power ground;

the data signal transmission end of the MCUU2LVDSI2C bus is connected with one end of a resistor R128, and the other end of the resistor R128 is connected with one end of a resistor R46 and the data signal transmission end of the deserializer U5LVDSI2C bus; the MCUU2LVDSI2C bus clock signal transmission end is connected with one end of a resistor R127, and the other end of the resistor R127 is connected with one end of a resistor R45 and a deserializer U5LVDSI2C bus clock signal transmission end; the other end of the resistor R46 and the other end of the resistor R45 are connected with an internal working voltage output end; the output end of the MCUU2LVDS power-saving mode is connected with one end of a resistor R48, the other end of the resistor R48 is connected with the anode of a diode D8, one end of a resistor R44 and a power-saving mode input pin of a deserializer U5, and the cathode of the diode D8 and the other end of the resistor R44 are connected with the output end of the internal working voltage of the deserializer U5;

the MCUU2LVDS backlight enabling signal output end is connected with one end of a resistor R51, and the other end of the resistor R51 is connected with a deserializer U5LVDS backlight enabling signal input end; the output end of the MCUU2LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of a deserializer U5LVDS backlight PWM signal; the output end of the MCUU2LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of a deserializer U5LVDS backlight PWM signal; the MCUU2LVDS first general signal transmission end is connected with one end of a resistor R57, and the other end of the resistor R57 is connected with a deserializer U5LVDS first general signal transmission end; the MCUU2LVDS second universal signal transmission end is connected with one end of a resistor R58, and the other end of the resistor R58 is connected with a deserializer U5LVDS second universal signal transmission end; the locking state output end of the deserializer U5 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with the MCUU2LVDS locking state input end, the deserializer U5 is connected with one end of a resistor R50 through a state output end, and the other end of the resistor R50 is connected with the MCUU2LVDS passing state input end;

the deserializer U5TFTOLV signal transmission line is connected with a first filter bank TFTOLV signal input end, a first filter bank TFTOLV signal output end is connected with an OSD chip U10TFTOLV signal input line, an OSD chip U10TFTOLV signal output line is connected with an FPC1TFTOLV signal input line, the deserializer U5TFTELV signal transmission line is connected with a second filter bank TFTELV signal input end, a second filter bank TFTELV signal output end is connected with an OSD chip U10TFTELV signal input line, and an OSD chip U10TFTELV signal output line is connected with an FPC1TFTELV signal input line; the other end of the resistor R96 is connected with the FPC1 data signal input end of the connector, the MCUU2TFT enable signal output end of the resistor R99 is connected with one end of the resistor R96, the other end of the resistor R96 is connected with the FPC1 data signal input end of the connector, the other end of the MCUU2TFT enable signal output end of the resistor R99 is connected with one end of the resistor R99, the other end of the resistor R99 is connected with the FPC1 enable signal input end of the connector, the MCUU2TFT reset signal output end of the resistor R101 is connected with one end of the resistor R101, the other end of the resistor R101 is connected with the FPC1 reset signal input end of the connector, the MCUU2TFT switch signal transmission end is connected with one end of the resistor R106, the other end of the resistor R106 is connected with the FPC1 switch signal transmission end of the connector and one end of the resistor R108, and the other end of the resistor R108 is connected with the power ground; the MCUU2TFT fault signal transmission end is connected with one end of a resistor R111, the other end of the resistor R111 is connected with the fault signal transmission end of a connector FPC1 and one end of a resistor R112, and the other end of the resistor R112 is connected with a power ground;

the voltage input end of an LED driver U6 is connected with a second power supply end of a power supply, one end of an inductor L12, one end of a capacitor C84, one end of a capacitor C85 and one end of a capacitor C86, the other end of the capacitor C84, the other end of the capacitor C85 and the other end of the capacitor C86 are connected with a power supply ground, the enabling signal input end of the LED driver U6 is connected with one end of a resistor R60, the other end of the resistor R60 is connected with the backlight enabling signal output end of the MCUU2TFT, the PWM signal input end of the LED driver U6 is connected with one end of a resistor R64, and the other end of the resistor R64 is connected with the backlight PWM signal output end of the MCUU2 TFT; the working voltage output end of the LED driver U6 is connected with one end of a resistor R66, one end of a resistor R65 and the cathode of a diode D10, the anode of the diode D10 and one end of the resistor R65 are both connected with one end of a capacitor C92, and the other end of the capacitor C92 is connected with a power ground; the other end of the resistor R66 is connected with a fault end of the LED driver U6 and one end of the resistor R70, and the other end of the resistor R70 is connected with an MCUU2TFT backlight fault signal output end;

the other end of the inductor L12 is connected with a voltage output end of the LED driver U6, the anode of the diode D9 and one end of the resistor R59, the other end of the resistor R59 is connected with one end of the capacitor C83, and the other end of the capacitor C83 is connected with a power ground; the negative electrode of the diode D9 is a TFT backlight power supply end; the other end of the capacitor C88, the other end of the capacitor C89, the other end of the capacitor C87 and the other end of the capacitor C90 are connected with a power ground; the TFT backlight power supply end is connected with one end of an inductor L24, the other end of the inductor L24 is connected with one end of a capacitor C102, one end of a resistor R172 and the voltage input end of a connector FPC2, the other end of the capacitor C102 is connected with a power ground, the other end of the resistor R172 is connected with one end of a resistor R173, one end of a capacitor C151 and the input end of an MCUU2TFT backlight power supply sampling signal, and the other end of the resistor R173 and the other end of the capacitor C151 are connected with the power ground;

a first backlight signal output end of an LED driver U6 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with a first backlight signal input end of a connector FPC2, a second backlight signal output end of the LED driver U6 is connected with one end of a resistor R110, the other end of the resistor R110 is connected with a second backlight signal input end of the connector FPC2, a third backlight signal output end of the LED driver U6 is connected with one end of a resistor R113 and one end of a resistor R174, the other end of the resistor R113 is connected with a third backlight signal input end of the connector FPC2, the other end of the resistor R174 is connected with one end of a resistor R175, one end of a capacitor C152 and a third backlight PWM signal sampling end of the MCUU2, a fourth backlight signal output end of the LED driver U6 is connected with one end of a resistor R114 and one end of a resistor R176, the other end of the resistor R114 is connected with a fourth backlight signal input end of the FPC2, and the other end of the resistor R176, one end of a capacitor C153 and the fourth backlight PWM signal sampling end of the MCUU 2; the MCUU2TFT backlight enabling signal output end is connected with one end of a resistor R107, the other end of the resistor R107 is connected with one end of a resistor R109, one end of a capacitor C105 and the base electrode of a triode Q4, the emitter electrode of the triode Q4, the other end of the resistor R109 and the other end of the capacitor C105 are connected with a power ground, the collector electrode of the triode Q4 is connected with one end of a resistor R104, the other end of the resistor R104 is connected with one end of a capacitor C100, one end of a resistor R102 and the base electrode of a triode Q3, the emitter electrode of the triode Q3 and the other end of the resistor R102 are both connected with a voltage output end of a voltage stabilizer U1, the collector electrode of the triode Q3 is connected with the other end of the capacitor C100, one end of a capacitor C101 and one end of a resistor R100, the other end of the capacitor C101 is connected with the power ground, one end of the resistor R100 is connected with one end of a resistor R98 and a connector FPC2TFT backlight enabling signal input end, the other end of the resistor R98 is connected with one end of a capacitor C99 and a MCUU2TFTNTC sampling end, and the other end of the capacitor C99 is connected with the power ground;

the MCUU2SPI communication initial signal output end is connected with an OSD chip U10SPI communication initial signal input end, the MCUU2SPI communication signal output end is connected with an OSD chip U10SPI communication signal input end, the MCUU2SPI communication signal input end is connected with an OSD chip U10SPI communication signal output end, the MCUU2SPI communication clock signal transmission end is connected with an OSD chip U10SPI communication clock signal transmission end, the MCUU2OSD reset output end is connected with one end of a resistor R136, the other end of the resistor R136 is connected with one end of a resistor R135, one end of a capacitor C141 and the OSD chip U10 reset signal input end, the other end of the resistor R135 is connected with the other end of an inductor L3, the other end of the capacitor C141 is connected with a power ground, the MCUU2OSD fault signal input end is connected with one end of a resistor R138, the other end of the resistor R138 is connected with one end of a resistor R137 and the fault signal input end of the OSD chip U10, and the other end of the resistor R137 is connected with the other end of the inductor L3;

The wake-up circuit comprises a third end of a first wiring row P1, one end of an ESD suppressor ESD1B, one end of a capacitor C5 and the anode of a diode D3, wherein the third end of the first wiring row P1 is connected with an automobile ignition signal input end, the other end of the ESD suppressor ESD1B and one end of the capacitor C5 are both connected with a power ground, the cathode of the diode D3 is connected with one end of a resistor R80, the other end of the resistor R80 is connected with one end of a resistor R81, one end of the capacitor C117 and the base electrode of a triode Q6, the other end of the resistor R81, the other end of the capacitor C117 and the emitter electrode of the triode Q6 are all connected with the power ground, a collector electrode of the triode Q6 is connected with a watchdog enabling end of a voltage stabilizer U1 and one end of a resistor R17, and the other end of the resistor R17 is connected with the power ground; the voltage input end of the voltage stabilizer U1 is connected with the resistor R13, and the other end of the voltage stabilizer U1 is connected with the voltage output end of the voltage stabilizer U1;

diode D3 negative pole is connected still resistance R10 one end, resistance R10 other end connecting resistance R11 one end, electric capacity C9 one end and triode Q2 base, the resistance R11 other end, the electric capacity C9 other end and triode Q2 projecting pole all connect power ground, triode Q2 collecting electrode connecting resistance R9 one end, triode Q1 base and resistance R8 one end are connected to the resistance R9 other end, stabiliser U1 voltage output end and triode Q1 projecting pole are connected to the resistance R8 other end, triode Q1 collecting electrode connecting resistance R7 one end, electric capacity C8 one end and MCUU2 wake-up signal input end, the power ground is all connected to the resistance R7 other end and the electric capacity C8 other end.

The voltage input end of the LCD power supply chip U7 is connected with the other end of the inductor L3, one end of the capacitor C109 and one end of the capacitor C110, the other end of the capacitor C109, the other end of the capacitor C110 and the grounding end of the LCD power supply chip U7 are connected with a power ground, the enable signal input end of the LCD power supply chip U7 is connected with one end of the resistor R123 and one end of the resistor R121, the other end of the resistor R121 is connected with the power ground, the other end of the resistor R123 is connected with the power supply enable signal output end of the MCUU2LCD, the voltage output end of the LCD power supply chip U7 outputs 3.3V voltage for supplying power to the LCD, the voltage output end of the LCD power supply chip U7 is connected with one end of the resistor R22 and one end of the capacitor C111, the other end of the capacitor C111 is connected with the power ground, the fault output end of the LCD power supply chip U7 is connected with one end of the resistor R122, one end of the resistor R124 and one end of the capacitor C112, the other end of the resistor R124 is connected with the power supply fault signal input end of the MCUU2LCD, and the other end of the capacitor C112 is connected with the power ground.

The working voltage input end of the optical sensor U13 is connected with the voltage output end of the voltage stabilizer U1, one end of the capacitor C148 and one end of the capacitor C149, the other end of the capacitor C148 and the other end of the capacitor C149 are connected with a power ground, the reference resistor end of the optical sensor U13 is connected with one end of the resistor R141, the other end of the resistor R141 and the grounding end of the optical sensor U13 are both connected with the power ground, the signal output end of the optical sensor U13 is connected with one end of the resistor R142 and one end of the resistor R54, the other end of the resistor R142 is connected with the light detection signal input end of the MCUU2, the clock end of the optical sensor U13 is connected with the light sensing clock signal end of the MCUU2 and one end of the resistor R55, the data end of the optical sensor U13 is connected with the light sensing data signal end of the MCUU2 and one end of the resistor R146, one end of the resistor R54 and one end of the resistor R146 are both connected with the voltage output end of the voltage stabilizer U1.

The CAN bus connecting circuit comprises a CAN transceiver U8 working voltage input end connected with a CAN power supply chip U9 voltage output end and one end of a capacitor C120, the other end of the capacitor C120 is connected with a power ground, a low level end of the CAN transceiver U8 is connected with a third end of a filter L14 and one end of a resistor R82, the other end of the resistor R82 is connected with a second end of the filter L14, and the other end of the resistor R82 is connected with a seventh end of a first wiring bar P1; the high-level end of the CAN transceiver U8 is connected with the fourth end of the filter L14 and one end of a resistor R88, the other end of the resistor R88 is connected with the first end of the filter L14, the other end of the resistor R88 is connected with the sixth end of a first wiring bar P1, and is connected with an automobile CAN bus through the seventh end and the sixth end of the first wiring bar P1, the other end of the resistor R88 is connected with one end of a resistor R86, one end of a capacitor C123 and the first end of an ESD suppressor ESD7, the other end of the resistor R86 is connected with one end of a capacitor C122 and one end of a resistor R84, the other end of the resistor R84 is connected with the other end of a resistor R82, the other end of the resistor R82 is also connected with one end of a capacitor C121, and the other ends of the capacitor C121 and the capacitor C122 are connected with a power ground;

CAN transceiver U8 sending end connecting resistance R83 one end, MCUU2CAN signal sending end is connected to the resistance R83 other end, CAN transceiver U8 receiving end resistance R85 one end, MCUU2CAN signal receiving end is connected to the resistance R85 other end, CAN transceiver U8 standby end connecting resistance R87 one end and MCUU2CAN wait for the end, the resistance R87 other end and CAN transceiver earthing terminal all connect power ground.

The invention also comprises a working method of the power supply circuit, which comprises the following steps:

s1, igniting and starting;

and S2, judging whether the power supply of the power supply is normal or not.

In step S1, the method for determining ignition start includes:

MCU (U2) judges whether the voltage value that MCU awakens the signal input part and receives is greater than or equal to and predetermines the voltage threshold:

if the voltage value received by the MCU wake-up signal input end is greater than or equal to the preset voltage threshold, indicating that ignition is started, and waking up the MCU (U2) to switch to a working state; the calculation method of the preset voltage threshold comprises the following steps:

wherein, U ₁ Represents a preset voltage threshold;

U _{MCU_3V3} the voltage value output by the voltage output end of the voltage stabilizer U1 is represented;

the voltage value of the voltage drop of the triode Q1 is represented;

U′ ₁ the system error voltage is 0.5V-0.8V;

| | represents taking an absolute value;

if the voltage value received by the MCU wake-up signal input end is smaller than the preset voltage threshold, the flameout is indicated, and the MCU (U2) is switched to a sleep state.

12. The power supply circuit operating method according to claim 10, wherein: the method for judging whether the power supply of the power supply is normal in the step S2 comprises the following steps:

s21, the MCU (U2) obtains a voltage value received by the first sampling end of the MCU power supply, and the MCU (U2) obtains an actual first sampling value according to the voltage value received by the first sampling end of the MCU power supply:

the actual first sampling value is calculated by the following method:

wherein, P ₀ Representing the voltage value received by the first end of the MCU power supply sampling;

U _BATTERY representing the actual first sample value;

indicating that the smaller of the two is taken;

the voltage value of the voltage drop of the diode D1 is represented;

the voltage value of the voltage drop of the diode D2 is represented; />

R ₁ Represents the resistance value of the resistor R1;

R ₂ represents the resistance value of the resistor R2;

R ₁₂₆ represents the resistance value of the resistor R126;

s22, the MCU (U2) obtains a voltage value received by the second end of the MCU power supply sample, and the MCU (U2) obtains an actual second sampling value according to the voltage value received by the second end of the MCU power supply sample:

the actual second sampling value is calculated by the following method:

wherein, P' ₀ Representing the voltage value received by the second end of the MCU power supply;

U′ _BATTERY representing the actual second sample value;

indicating that the smaller of the two is taken;

the voltage value of the voltage drop of the diode D1 is represented;

indicating diodeD2, voltage drop value;

R ₁₂₆ represents the resistance value of the resistor R126;

R ₁₄₃ represents the resistance value of the resistor R143;

R ₁₄₄ represents the resistance value of the resistor R144;

R ₁₄₅ represents the resistance value of the resistor R145;

s23, judging the actual first sampling value U _BATTERY And an actual second sampling value U' _BATTERY The size relationship between:

if U _BATTERY -U′ _BATTERY |≤U ₀ ，U ₀ If the preset voltage normal threshold value is represented, generally 0.15V-0.25V, the actual sampling value is obtained, and the calculation method of the actual sampling value is as follows:

therein, max (U) _BATTERY ,U′ _BATTERY ) Indicating that the larger of the two is taken;

judging the size relation between the actual sampling value and a first voltage threshold value and a second voltage threshold value of a preset storage battery:

if U' ₀ ≥P ₁ Wherein, U' ₀ Representing the actual sampling value; p ₁ Representing a preset first voltage threshold of the storage battery; the electric quantity of the storage battery is sufficient at the moment;

if P ₂ ≤U′ ₀ ＜P ₁ Wherein P is ₂ Representing a preset second voltage threshold of the storage battery; u' ₀ Representing the actual sampling value; the second voltage threshold of the preset storage battery is smaller than the first voltage threshold of the preset storage battery，P ₁ Representing a preset first voltage threshold of the storage battery; the electric quantity of the storage battery is insufficient at the moment;

if U' ₀ ＜P ₂ Wherein, U' ₀ Representing the actual sampling value; p ₂ Representing a preset second voltage threshold of the storage battery; the electric quantity of the storage battery is too low at this moment, and the storage battery (external power supply) needs to be charged;

if U _BATTERY -U′ _BATTERY |＞U ₀ If the accumulator works abnormally, the alarm is given out.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides an instrument display device convenient to installation, includes screen assembly, support (4), PCB board (5) and backshell (6) that set gradually from the past backward, its characterized in that: the automobile rear shell structure is characterized in that two L-shaped clamps (3) used for being clamped on an automobile body are arranged on the left and right sides of the top of the support (4) at intervals, the L-shaped clamps (3) are located above the rear shell (6), a plurality of mounting lugs (2) used for being mounted on the automobile body are arranged on the left and right sides of the bottom of the support (4) at intervals, mounting holes are formed in the mounting lugs (2), the mounting lugs are mounted on the automobile body in a matched mode through mounting bolts, the mounting lugs (2) are located below the rear shell (6), and the bottom ends of the mounting lugs (2) are inclined backwards and extend;

the screen assembly comprises a glass cover plate (1) and a liquid crystal screen (1 a), the glass cover plate (1) extends out of the liquid crystal screen (1 a), a glass mounting groove for mounting the glass cover plate (1) is concavely arranged on the front side of the support (4), a screen mounting groove for mounting the liquid crystal screen (1 a) is concavely arranged on the bottom of the glass mounting groove, the notch of the screen mounting groove is sealed by the glass cover plate (1), and a partition frame for supporting the back of the liquid crystal screen (1 a) is arranged in the screen mounting groove, so that the liquid crystal screen (1 a) is separated from the bottom of the screen mounting groove;

the glass mounting groove is characterized in that a light guide hole (4 e) is formed in a position, corresponding to the glass mounting groove, of the support (4), a light guide column is arranged in the light guide hole (4 e), one side of the PCB (5) stretches to the rear side of the light guide column and is provided with a light sensor U13 used for sensing external light of an instrument, light is guided for the light sensor U13 through the light guide column, a plurality of first positioning clamping columns (4 d) used for installing and positioning the rear shell (6) are arranged on the rear side of the support (4) along the circumferential direction of the support, a first abdicating notch (5 a) is formed in the PCB (5) corresponding to the first positioning clamping columns (4 d), second positioning clamping columns (6 a) are arranged on the rear shell (6) corresponding to the first positioning columns, and clamping holes which are used for the second positioning clamping columns (6 a) to be clamped into and extend forwards and backwards are formed in the first positioning clamping columns (4 d); the second positioning clamping column (6 a) is clamped on the first positioning clamping column (4 d).

2. A meter display unit for facilitating installation according to claim 1, wherein: the utility model discloses a screen, including the vertical overlap joint pole (4 a) that separates the frame and be used for linking together all vertical overlap joint poles (4 a) about including, horizontal pole (4 b) that the interval set up, the upper and lower both ends of overlap joint pole (4 a) are all installed on the inside wall of screen mounting groove, both ends are also installed on the inside wall of screen mounting groove about horizontal pole (4 b), and the front side of all overlap joint poles (4 a) all is equipped with the draw-in groove that is used for the card to go into horizontal pole (4 b) for horizontal pole (4 b) flush with the front side of overlap joint pole (4 a), it is equipped with vertical extension's locating lever (4 c) to go back integrated into one piece on horizontal pole (4 b), horizontal pole (4 b) are the cross with locating lever (4 c) and distribute, and the front side of arbitrary overlap joint pole (4 a) is equipped with and is used for the card to go into the constant head tank of locating lever (4 c).

3. A meter display unit for facilitating installation according to claim 1, wherein: first location calorie of post (4 d) all is "[" type with second location calorie of post (6 a), the card hole is the space that "[" type encloses, and second location calorie of post (6 a) inserts in the card hole of first location calorie of post (4 d), and the opening of second location calorie of post (6 a) and first location calorie of post (4 d) sets up relatively.

4. A meter display device for ease of installation according to claim 3, wherein: first location card post (4 d) are three, set up left side, right side and the top setting by support (4) respectively, are close to the leaded light post setting first location card post (4 d) set up the middle part at PCB board (5), and the edge setting that PCB board (5) was leaned on in all the other two first location card posts (4 d).

5. An easily installable instrument display unit according to claim 1, wherein: installation journal stirrup (2) are three for setting up from a left side to the right side, and installation journal stirrup (2) that set up between two parties are less than installation journal stirrup (2) on left side and right side, and installation journal stirrup (2) that are located left side and right side set up along the vertical central line symmetry of instrument, the bottom of backshell (6) is equipped with and is used for the second that lets the position breach (6 b) for installation journal stirrup (2) on left side and right side.

6. An operating circuit of an instrument display device comprises the instrument display device of any one of claims 1 to 5 and further comprises an MCU (U2), wherein the wake-up signal input end of the MCU (U2) is connected with one end of the wake-up circuit, the other end of the wake-up circuit is connected with a wiring row P1, and the wake-up signal input end of the wake-up circuit is connected with the wake-up signal output end of an automobile host through the wiring row P1; the light detection signal input end of the MCU (U2) is connected with the detection signal output end of the optical sensor U13, the backlight adjustment signal output end of the MCU (U2) TFT is connected with the backlight signal input end of the LED driver U6, and the adjustment output end of the LED driver U6 is connected with the adjustment signal input end of the connector FPC 2;

still include power supply circuit, power supply circuit power input one end connection row P1 connects external power source through row P1 of connecting, fourth step-down circuit voltage input end is connected to power supply circuit's the first feed end of power, first step-down circuit voltage input end is connected to power supply circuit's power second feed end, second step-down circuit voltage input end and third step-down circuit voltage input end are connected to first step-down circuit voltage output end.

7. An operating circuit of a meter display apparatus according to claim 6, wherein: the power supply circuit comprises a first wiring bar P1, wherein the first end of the first wiring bar P1 is connected with one end of a transient suppression diode TVS1, one end of a capacitor C2, the anode of a diode D2 and the anode of the diode D1, the first end of the first wiring bar P1 is used for being connected with an external power supply, the other end of the capacitor C2 is connected with a power ground, the other end of the transient suppression diode TVS1 is connected with the second end of the first wiring bar P1, the second end of the first wiring bar P1 is used for being connected with the power ground, the cathode of the diode D2 is connected with the cathode of the diode D1, one end of a capacitor C4, one end of a capacitor C3 and one end of an inductor L1, and the other end of the capacitor C4 and the other end of the capacitor C3 are both connected with the power ground; one end of an inductor L1 is a first power supply end of a power supply, the other end of the inductor L1 is a second power supply end of the power supply, the other end of the inductor L1 is connected with one end of a capacitor C13 and the anode of a diode D11, the other end of the capacitor C13 is connected with the power ground, the cathode of the diode D11 is connected with a voltage input end of a voltage stabilizer U1, one end of a capacitor C4, one end of a capacitor C10 and one end of a resistor R4, the other end of the capacitor C4 and the other end of the capacitor C10 are connected with the power ground, the other end of the resistor R4 is connected with an enabling end of the voltage stabilizer U1, a voltage output end of the voltage stabilizer U1 outputs 3.3V voltage to supply power for an MCU (U2), a voltage output end of the voltage stabilizer U1 is connected with one end of the capacitor C11 and one end of a capacitor C27, and the other end of the capacitor C11 and the other end of the capacitor C27 are connected with the power ground; the reset end of the voltage stabilizer U1 is connected with one end of a resistor R15, the fault end of the voltage stabilizer U1 is connected with one end of a resistor R16, and the other end of the resistor R15 and the other end of the resistor R16 are both connected with an MCU (U2) reset signal input end; the reset delay end of the voltage stabilizer U1 is connected with one end of a capacitor C12, the other end of the capacitor C12 is connected with a power ground, the ROSC end of the voltage stabilizer U1 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with the power ground;

the negative electrode of the diode D1 is connected with one end of a resistor R126, the other end of the resistor R126 is connected with one end of a resistor R1 and one end of a resistor R144, the other end of the resistor R126 is connected, the other end of the resistor R1 is connected with one end of a resistor R2 and the first end of a MCU (U2) power supply sampling, the other end of the resistor R2 is connected with one end of a capacitor C1 and a power ground, and the other end of the capacitor C1 is connected with the other end of the resistor R1; the other end of the resistor R144 is connected with one end of a resistor R143, and the other end of the resistor R143 is connected with one end of a resistor R145 and a second end of the MCU (U2) power supply sampling; the other end of the resistor R145 is connected with one end of a capacitor C150 and the power ground, and the other end of the capacitor C150 is connected with one end of the resistor R145;

the first voltage reduction circuit comprises a voltage reduction DC-DC converter (U3) enabling signal input end connected with one end of a resistor R26 and one end of a resistor R28, the other end of the resistor R28 is connected with a power ground, the other end of the resistor R26 is connected with a working voltage power supply enabling output end of an MCU (U2), a voltage input end of the voltage reduction DC-DC converter (U3) is connected with a second power supply end of a power supply, one end of a capacitor C28, one end of a capacitor C29 and one end of a capacitor C30, and the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all connected with the power ground; the BOOT end of the voltage reduction DC-DC converter (U3) is connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of a capacitor C25, the other end of the capacitor C25 is connected with one end of a resistor R24, the other end of the resistor R24 is connected with one end of a capacitor C26, and the other end of the capacitor C26 is connected with the power ground; the output end of a switch of the voltage reduction DC-DC converter (U3) is connected with one end of an inductor L3, the cathode of a diode D7 and one end of a resistor R24, the other end of the inductor L3 outputs 3.3V power supply voltage for supplying power to a deserializer U5, an MSPI communication interface U11, an LCD power supply chip U7 and a light sensor U13, the other end of the inductor L3 is connected with one end of a capacitor C32, one end of a capacitor C33, one end of a capacitor C34 and one end of a capacitor C31, and the other end of the capacitor C32, the other end of the capacitor C33, the other end of the capacitor C34, the other end of the capacitor C31 and the anode of the diode D7 are connected with a power ground;

the other end of the inductor L3 is connected with one end of a resistor R77, the other end of the resistor R77 is connected with a first step-down sampling signal input end of the MCU (U2), one end of a resistor R78 and one end of a capacitor C114, and the other end of the resistor R78 and the other end of the capacitor C114 are connected with a power ground;

the inverting input of the voltage-reducing DC-DC converter (U3) is connected with one end of a resistor RFBB1 and one end of a resistor RFBT1, the other end of the resistor RFBB1 is connected with a power ground, the other end of the resistor RFBT1 is connected with one end of a resistor RFBT2, and the other end of the resistor RFBT2 is connected with the other end of a inductor L3;

the oscillation end of the voltage reduction DC-DC converter (U3) is connected with one end of a resistor R29, the other end of the resistor R29 is connected with a power ground, the starting time end of the voltage reduction DC-DC converter (U3) is connected with one end of a resistor R27 and one end of a capacitor C36, the other end of the resistor R27 is connected with one end of a capacitor C35, and the other end of the capacitor C35 and the other end of the capacitor C36 are connected with the power ground;

the second voltage reduction circuit comprises a voltage input end of a voltage stabilizer U4, the other end of an inductor L3, one end of a resistor R30 and one end of a capacitor C37, the other end of the resistor R30 is connected with an enabling signal input end of the voltage stabilizer U4 and one end of a resistor R32, the other end of the capacitor C37 and the other end of the resistor R32 are both connected with a power ground, a voltage output end of the voltage stabilizer U4 outputs 1.2V working voltage for supplying power to the deserializer, and is connected with one end of a resistor RFBT3, a normally opened end of the voltage stabilizer U4, one end of a capacitor C38, one end of a resistor R31 and one end of a resistor R79, the other end of the resistor RFBT3 is connected with a feedback voltage input end of the voltage stabilizer U4 and one end of a resistor RFBB2, the other end of the capacitor C38 and the other end of the resistor R31 are all connected with the power ground, the other end of a resistor R79 is connected with a second voltage reduction sampling signal input end of the MCU (U2), one end of a resistor R167 and one end of a capacitor C115, and the other end of the resistor R167 are all connected with the power ground;

the voltage output end of the voltage stabilizer U12 is connected with one end of a filter L18, the other end of the filter L18 outputs 1.5V voltage for supplying power to an OSD chip U10, the other end of the filter L18 is connected with one end of a resistor R168, the other end of the resistor R168 is connected with a power supply sampling signal input end of MCU (U2) OSD1.5, one end of a resistor R169 and one end of a capacitor C116, and the other end of the resistor R169 and the other end of the capacitor C116 are both connected with a power ground;

the fourth voltage reduction circuit comprises a voltage input end of a CAN power supply chip U9 connected with a first power supply end of a power supply and one end of a capacitor C26, one end of a capacitor C126 and a grounding end of the CAN power supply chip U9 are both connected with a power supply ground, a voltage output end of the CAN power supply chip U9 outputs 5V voltage for supplying power to a CAN transceiver U8, a voltage output end of the CAN power supply chip U9 is connected with one end of a capacitor C125, the other end of the capacitor C125 is connected with the power supply ground, a reset output end of the CAN power supply chip U9 is connected with one end of a resistor R53, the other end of the resistor R53 is connected with one end of a resistor R52 and a MCUCAN power supply fault signal input end, and the other end of the resistor R52 is connected with a voltage output end of a voltage stabilizer U1; the CAN power supply chip U9 time delay reset end is connected with one end of the capacitor Css1, and the other end of the capacitor Css1 is connected with a power ground.

8. An operating circuit of a meter display apparatus according to claim 7, wherein: the first end of the second wiring bank J1 is connected with the first end of the filter L11 and one end of the ESD suppressor ESD5, and the other end of the ESD suppressor ESD5 is connected with the power ground; the third end of the second wiring bank J1 is connected with the second end of the filter L11 and one end of an ESD suppressor ESD6, and the other end of the ESD suppressor ESD6 is connected with a power ground; the third end of the filter L11 is connected with one end of a capacitor C73, the other end of the capacitor C73 is connected with the second RIN anode end of the deserializer U5, the fourth end of the filter L11 is connected with one end of a capacitor C74, and the other end of the capacitor C74 is connected with the second RIN cathode end of the deserializer U5; the second end of the second line bank J1 is connected with the first end of the filter L10 and one end of the ESD suppressor ESD4, and the other end of the ESD suppressor ESD4 is connected with the power ground; a fourth end of the second wiring bank J1 is connected with a second end of the filter L10 and one end of the ESD suppressor ESD3, and the other end of the ESD suppressor ESD3 is connected with a power ground; the third end of the filter L10 is connected with one end of a capacitor C71, the other end of the capacitor C71 is connected with the first RIN anode end of the deserializer U5, the fourth end of the filter L10 is connected with one end of a capacitor C72, and the other end of the capacitor C72 is connected with the first RIN cathode end of the deserializer U5;

the output end of an MCU (U2) LVDS enable signal is connected with one end of a resistor R43, the other end of the resistor R43 is connected with one end of a resistor R41, one end of a resistor R42 and the output end of a deserializer U5BIST clock, the other end of the resistor R41 is connected with one end of a resistor R39 and the output end of the internal working voltage of the deserializer U5, the other end of the resistor R39 is connected with one end of a resistor R40 and the output end of the deserializer U5BIST enable signal, and the other end of the resistor R40 and the other end of the resistor R42 are connected with a power ground;

the LVDSI2C bus data signal transmission end of the MCU (U2) is connected with one end of a resistor R128, and the other end of the resistor R128 is connected with one end of a resistor R46 and a deserializer U5LVDSI2C bus data signal transmission end; the LVDSI2C bus clock signal transmission end of the MCU (U2) is connected with one end of a resistor R127, and the other end of the resistor R127 is connected with one end of a resistor R45 and the LVDSI2C bus clock signal transmission end of the deserializer U5; the other end of the resistor R46 and the other end of the resistor R45 are connected with an internal working voltage output end; the output end of the LVDS power-saving mode of the MCU (U2) is connected with one end of a resistor R48, the other end of the resistor R48 is connected with the anode of a diode D8, one end of a resistor R44 and a power-saving mode input pin of a deserializer U5, and the cathode of the diode D8 and the other end of the resistor R44 are connected with the output end of the internal working voltage of the deserializer U5;

the output end of the MCU (U2) LVDS backlight enable signal is connected with one end of a resistor R51, and the other end of the resistor R51 is connected with the input end of a deserializer U5LVDS backlight enable signal; the output end of the MCU (U2) LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of a deserializer U5LVDS backlight PWM signal; the output end of the MCU (U2) LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of a deserializer U5LVDS backlight PWM signal; the first general signal transmission end of the MCU (U2) LVDS is connected with one end of a resistor R57, and the other end of the resistor R57 is connected with the first general signal transmission end of the deserializer U5 LVDS; the second universal signal transmission end of the LVDS of the MCU (U2) is connected with one end of a resistor R58, and the other end of the resistor R58 is connected with the second universal signal transmission end of the LVDS of the deserializer U5; the locking state output end of the deserializer U5 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with the LVDS locking state input end of the MCU (U2), the deserializer U5 is connected with one end of a resistor R50 through a state output end, and the other end of the resistor R50 is connected with the LVDS passing state input end of the MCU (U2);

the deserializer U5TFTOLV signal transmission line is connected with a first filter bank TFTOLV signal input end, a first filter bank TFTOLV signal output end is connected with an OSD chip U10TFTOLV signal input line, an OSD chip U10TFTOLV signal output line is connected with an FPC1TFTOLV signal input line, the deserializer U5TFTELV signal transmission line is connected with a second filter bank TFTELV signal input end, a second filter bank TFTELV signal output end is connected with an OSD chip U10TFTELV signal input line, and an OSD chip U10TFTELV signal output line is connected with an FPC1TFTELV signal input line; the clock signal input end of a connector FPC1 is connected with one end of a resistor R97, the other end of the resistor R97 is connected with a MCU (U2) TFT clock signal output end, the data signal output end of the MCU (U2) TFT is connected with one end of a resistor R96, the other end of the resistor R96 is connected with the data signal input end of the connector FPC1, the enable signal output end of the MCU (U2) TFT is connected with one end of a resistor R99, the other end of the resistor R99 is connected with the enable signal input end of the connector FPC1, the reset signal output end of the MCU (U2) TFT is connected with one end of a resistor R101, the other end of the resistor R101 is connected with the reset signal input end of the connector FPC1, the switch signal transmission end of the MCU (U2) TFT is connected with one end of a resistor R106, the other end of the resistor R106 is connected with one end of a switch signal transmission end of the connector FPC1 and one end of a resistor R108, and the other end of the resistor R108 is connected with a power ground; the fault signal transmission end of the MCU (U2) TFT is connected with one end of a resistor R111, the other end of the resistor R111 is connected with the fault signal transmission end of the FPC1 of the connector and one end of a resistor R112, and the other end of the resistor R112 is connected with a power ground;

the voltage input end of an LED driver U6 is connected with a second power supply end of a power supply, one end of an inductor L12, one end of a capacitor C84, one end of a capacitor C85 and one end of a capacitor C86, the other end of the capacitor C84, the other end of the capacitor C85 and the other end of the capacitor C86 are connected with a power ground, an enabling signal input end of the LED driver U6 is connected with one end of a resistor R60, the other end of the resistor R60 is connected with a backlight enabling signal output end of an MCU (U2) TFT, a PWM signal input end of the LED driver U6 is connected with one end of a resistor R64, and the other end of the resistor R64 is connected with a backlight PWM signal output end of the MCU (U2) TFT; the working voltage output end of the LED driver U6 is connected with one end of a resistor R66, one end of a resistor R65 and the cathode of a diode D10, the anode of the diode D10 and one end of the resistor R65 are both connected with one end of a capacitor C92, and the other end of the capacitor C92 is connected with a power ground; the other end of the resistor R66 is connected with a fault end of the LED driver U6 and one end of the resistor R70, and the other end of the resistor R70 is connected with a TFT backlight fault signal output end of the MCU (U2);

the other end of the inductor L12 is connected with a voltage output end of the LED driver U6, the anode of the diode D9 and one end of the resistor R59, the other end of the resistor R59 is connected with one end of the capacitor C83, and the other end of the capacitor C83 is connected with a power ground; the negative electrode of the diode D9 is a TFT backlight power supply end; the TFT backlight power supply end is connected with one end of an inductor L24, the other end of the inductor L24 is connected with one end of a capacitor C102, one end of a resistor R172 and the voltage input end of a connector FPC2, the other end of the capacitor C102 is connected with a power ground, the other end of the resistor R172 is connected with one end of a resistor R173, one end of a capacitor C151 and the input end of a MCU (U2) TFT backlight power supply sampling signal, and the other end of the resistor R173 and the other end of the capacitor C151 are connected with the power ground;

a first backlight signal output end of an LED driver U6 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with a first backlight signal input end of a connector FPC2, a second backlight signal output end of the LED driver U6 is connected with one end of a resistor R110, the other end of the resistor R110 is connected with a second backlight signal input end of the connector FPC2, a third backlight signal output end of the LED driver U6 is connected with one end of a resistor R113 and one end of a resistor R174, the other end of the resistor R113 is connected with a third backlight signal input end of the connector FPC2, the other end of the resistor R174 is connected with one end of a resistor R175, one end of a capacitor C152 and a third backlight PWM signal sampling end of an MCU (U2), a fourth backlight signal output end of the LED driver U6 is connected with one end of a resistor R114 and one end of a resistor R176, the other end of the resistor R114 is connected with a fourth backlight signal input end of the connector FPC2, and the other end of the resistor R176 is connected with one end of a resistor R177, one end of a capacitor C153 and a fourth backlight PWM signal sampling end of the MCU (U2); the other end of the resistor R107 is connected with one end of a resistor R109, one end of a capacitor C105 and the base electrode of a triode Q4, the emitter electrode of the triode Q4, the other end of the resistor R109 and the other end of the capacitor C105 are connected with a power ground, the collector electrode of the triode Q4 is connected with one end of a resistor R104, the other end of the resistor R104 is connected with one end of a capacitor C100, one end of a resistor R102 and the base electrode of a triode Q3, the emitter electrode of the triode Q3 and the other end of the resistor R102 are both connected with a voltage output end of a voltage stabilizer U1, the collector electrode of the triode Q3 is connected with the other end of the capacitor C100, one end of a capacitor C101 and one end of a resistor R100, the other end of the capacitor C101 is connected with the power ground, one end of the resistor R100 is connected with one end of a resistor R98 and a TFT backlight enabling signal input end of a connector FPC2, the other end of the resistor R98 is connected with one end of a capacitor C99 and a TFTC sampling end of the TNTC (U2), and the other end of the capacitor C99 is connected with the power ground;

the MCU (U2) SPI communication initial signal output end is connected with an OSD chip U10SPI communication initial signal input end, the MCU (U2) SPI communication signal output end is connected with an OSD chip U10SPI communication signal input end, the MCU (U2) SPI communication signal input end is connected with an OSD chip U10SPI communication signal output end, the MCU (U2) SPI communication clock signal transmission end is connected with an OSD chip U10SPI communication clock signal transmission end, the MCU (U2) OSD reset output end is connected with one end of a resistor R136, the other end of the resistor R136 is connected with one end of a resistor R135, one end of a capacitor C141 and the OSD chip U10 reset signal input end, the other end of the resistor R135 is connected with the other end of an inductor L3, the other end of the capacitor C141 is connected with a power ground, the MCU (U2) OSD fault signal input end is connected with one end of a resistor R138, the other end of the resistor R138 is connected with one end of a resistor R137 and the OSD chip U10 fault signal input end, and the other end of the resistor R137 is connected with the other end of an inductor L3;

an OSD chip U10MSPI communication clock signal transmission end is connected with one end of a resistor R133, the other end of the resistor R133 is connected with an MSPI communication interface U11 clock signal transmission end, an OSD chip U10MSPI communication initial signal output end is connected with one end of a resistor R132, the other end of the resistor R132 is connected with an MSPI communication interface U11 initial signal output end, an OSD chip U10MSPI communication signal input end is connected with one end of a resistor R131, the other end of the resistor R131 is connected with an MSPI communication interface U11 communication signal output end, an OSD chip U10MSPI communication signal output end is connected with one end of a resistor R134, and the other end of the resistor R134 is connected with an MSPI communication interface U11 communication signal input end; the MSPI communication interface U11 has a working voltage input end connected with one end of an inductor L16, one end of a capacitor C129 and one end of a capacitor C130, and the other end of the inductor L16 is connected with the other end of an inductor L3.

9. An operating circuit of a meter display device according to claim 1, wherein: the wake-up circuit comprises a third end of the first wiring bar P1, a third end of the first wiring bar P1 is connected with one end of an ESD suppressor ESD1B, one end of a capacitor C5 and the anode of a diode D3, the third end of the first wiring bar P1 is used for being connected with an automobile ignition signal input end, the other end of the ESD suppressor ESD1B and one end of the capacitor C5 are both connected with a power ground, the cathode of the diode D3 is connected with one end of a resistor R80, the other end of the resistor R80 is connected with one end of a resistor R81, one end of a capacitor C117 and a base electrode of a triode Q6, the other end of the resistor R81, the other end of the capacitor C117 and an emitter electrode of the triode Q6 are all connected with the power ground, a collector electrode of the triode Q6 is connected with an enabling end of a watchdog U1 of a voltage stabilizer and one end of a resistor R17, and the other end of the resistor R17 is connected with the power ground; the voltage input end of the voltage stabilizer U1 is connected with the resistor R13, and the other end of the voltage stabilizer U1 is connected with the voltage output end of the voltage stabilizer U1;

the negative electrode of the diode D3 is connected with one end of a resistor R10, the other end of the resistor R10 is connected with one end of a resistor R11, one end of a capacitor C9 and the base electrode of a triode Q2, the other end of the resistor R11, the other end of the capacitor C9 and the emitting electrode of the triode Q2 are all connected with a power ground, the collecting electrode of the triode Q2 is connected with one end of the resistor R9, the base electrode of the triode Q1 and one end of a resistor R8 are connected with the other end of the resistor R9, the voltage output end of a voltage stabilizer U1 and the emitting electrode of the triode Q1 are connected with the other end of the resistor R8, the collecting electrode of the triode Q1 is connected with one end of a resistor R7, one end of the capacitor C8 and the wake-up signal input end of an MCU (U2), and the other end of the resistor R7 and the other end of the capacitor C8 are both connected with the power ground;

the voltage input end of the LCD power supply chip U7 is connected with the other end of the inductor L3, one end of the capacitor C109 and one end of the capacitor C110, the other end of the capacitor C109, the other end of the capacitor C110 and the grounding end of the LCD power supply chip U7 are connected with a power ground, the enable signal input end of the LCD power supply chip U7 is connected with one end of the resistor R123 and one end of the resistor R121, the other end of the resistor R121 is connected with the power ground, the other end of the resistor R123 is connected with the enable signal output end of MCU (U2) LCD power supply, the voltage output end of the LCD power supply chip U7 outputs 3.3V voltage for supplying power to the LCD, the voltage output end of the LCD power supply chip U7 is connected with one end of the resistor R22 and one end of the capacitor C111, the other end of the capacitor C111 is connected with the power ground, the fault output end of the LCD power supply chip U7 is connected with one end of the resistor R122, one end of the resistor R124 and one end of the capacitor C112, the other end of the resistor R124 is connected with the LCD power supply fault signal input end of the MCU (U2) LCD power supply, and the other end of the capacitor C112 is connected with the power ground.

10. An operating circuit of a meter display device according to claim 1, wherein: the working voltage input end of the optical sensor U13 is connected with the voltage output end of a voltage stabilizer U1, one end of a capacitor C148 and one end of a capacitor C149, the other end of the capacitor C148 and the other end of the capacitor C149 are connected with a power ground, the reference resistor end of the optical sensor U13 is connected with one end of a resistor R141, the other end of the resistor R141 and the grounding end of the optical sensor U13 are both connected with the power ground, the signal output end of the optical sensor U13 is connected with one end of a resistor R142 and one end of a resistor R54, the other end of the resistor R142 is connected with the light detection signal input end of an MCU (U2), the clock end of the optical sensor U13 is connected with the light sensing clock signal end of the MCU (U2) and one end of a resistor R55, the data end of the optical sensor U13 is connected with the light sensing data signal end of the MCU (U2) and one end of the resistor R146, and one end of the resistor R54, the resistor R55 and one end of the resistor R146 are all connected with the voltage output end of the voltage stabilizer U1;

the CAN bus connecting circuit comprises a CAN transceiver U8 working voltage input end connected with a CAN power supply chip U9 voltage output end and one end of a capacitor C120, the other end of the capacitor C120 is connected with a power ground, the low level end of the CAN transceiver U8 is connected with the third end of a filter L14 and one end of a resistor R82, the other end of the resistor R82 is connected with the second end of the filter L14, and the other end of the resistor R82 is connected with the seventh end of a first wiring bar P1; the high-level end of the CAN transceiver U8 is connected with the fourth end of the filter L14 and one end of a resistor R88, the other end of the resistor R88 is connected with the first end of the filter L14, the other end of the resistor R88 is connected with the sixth end of a first wiring bar P1, and is connected with an automobile CAN bus through the seventh end and the sixth end of the first wiring bar P1, the other end of the resistor R88 is connected with one end of a resistor R86, one end of a capacitor C123 and the first end of an ESD suppressor ESD7, the other end of the resistor R86 is connected with one end of a capacitor C122 and one end of a resistor R84, the other end of the resistor R84 is connected with the other end of a resistor R82, the other end of the resistor R82 is also connected with one end of a capacitor C121, and the other ends of the capacitor C121 and the capacitor C122 are connected with a power ground;

CAN transceiver U8 sending end connecting resistance R83 one end, MCU (U2) CAN signal sending end is connected to the resistance R83 other end, MCU transceiver U8 receiving end resistance R85 one end, MCU (U2) CAN signal receiving end is connected to the resistance R85 other end, CAN transceiver U8 awaits the opportune moment and holds connecting resistance R87 one end and MCU (U2) CAN and await the opportune moment end, the resistance R87 other end and CAN transceiver earthing terminal all connect power ground.