Expansion circuit for automobile combination instrument

Abstract

The invention discloses an expansion circuit for an automobile combination instrument. The expansion circuit comprises a first CAN bus short-circuiting device, a second CAN bus short-circuiting device, a first plug-in port and a second plug-in port. A CAN bus terminal pin and a power supply terminal pin are arranged in each of the first plugging port and the second plugging port. The first CAN bus short-circuiter is connected with the combination instrument and a CAN bus terminal pin wire harness corresponding to the first plugging port. The power supply output end of the combination instrument is connected with the power supply pin wire harness of the first plugging port. And the second CAN bus short-circuiter is connected with the CAN bus wiring end wire harness corresponding to the second plugging port. And the optional electrical configuration module is connected with a CAN bus terminal pin and a power supply pin corresponding to the second plugging port. The first plug interface and the second plug interface are matched interfaces and are male and female ends for circuit segmentation and pairing connection. According to the invention, the modularization and generalization level of the circuit can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument cluster expansion circuits, and more particularly to an expansion circuit for an automobile instrument cluster. Background Art

[0002] With the development and expansion of new energy vehicle projects, the overall vehicle electrical configuration and network communications are becoming increasingly complex, and the difficulty of vehicle circuit connection and the number of wiring harness loops are also increasing. Typically, the design state of the vehicle wiring harness drawing will include all the selected electrical configurations. If a certain electrical configuration is not selected, the wiring harness branch corresponding to that configuration on the wiring harness drawing will be repackaged and not used, resulting in cost waste. If the repackage is not done properly, the wiring harness branch will cause interference or abnormal noise when it is dragged. The existing vehicle optional electrical configuration plans include reversing images, reversing radar, and tire pressure monitoring controller configurations. Because reversing images, reversing radar, and tire pressure monitoring controllers are all optional configurations, the vehicle model may choose to select one, two, or all three. When one or two of them are selected, the circuit or wiring harness corresponding to the other unselected configuration is redundant, resulting in cost waste. Therefore, it is of great significance to expand the circuit of the vehicle combination instrument to facilitate the assembly of the selected equipment. Summary of the Invention

[0003] The present invention provides an expansion circuit for an automobile instrument cluster, which solves the problems of low modularity and universality of connection circuits and wiring harnesses of existing automobile instrument clusters and the inability to conveniently adapt to the installation of optional electronic equipment. The invention can improve the modularity and universality of circuits corresponding to electrical configurations and enhance the convenience of adding or removing electrical equipment for installation.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] An expansion circuit for an automobile combination instrument comprises: a first CAN bus short circuiter, a second CAN bus short circuiter, a first plug interface and a second plug interface;

[0006] The first plug interface and the second plug interface are both provided with CAN bus terminal pins and power terminal pins;

[0007] The first CAN bus short circuiter is respectively connected to the CAN bus terminal pin harness corresponding to the instrument cluster and the first plug interface;

[0008] The power output end of the combined instrument is connected to the power pin harness of the first plug interface;

[0009] The second CAN bus short circuiter is connected to the CAN bus terminal harness corresponding to the second plug interface;

[0010] The optional electrical configuration module is connected to the CAN bus terminal pins and power pins corresponding to the second plug interface;

[0011] The first plug interface and the second plug interface are mating interfaces and are male and female to each other;

[0012] When the first plug interface is disconnected from the second plug interface, the instrument cluster and the corresponding circuit of the optional electrical configuration module are separated;

[0013] When the first plug interface is plugged into the second plug interface, the instrument cluster is connected to the corresponding circuit of the optional electrical configuration module.

[0014] Preferably, it also includes: a reverse gear switch;

[0015] The reverse gear switch is connected in series between the positive pole of the vehicle power supply and the power input end of the combination instrument. When the vehicle manual gear is in the reverse gear position, the reverse gear switch conducts the electrical connection between the positive pole of the vehicle power supply and the power input end of the combination instrument.

[0016] Preferably, the first CAN bus circuit breaker is provided with a plurality of power supply pins for use with a plurality of optional electrical configuration modules.

[0017] Preferably, at least one power supply pin in the first CAN bus circuit breaker is connected to the positive pole of the vehicle power supply, and at least one power supply pin is connected to the output end of the reverse switch.

[0018] Preferably, when the tire pressure monitoring controller is assembled with the second CAN bus short circuiter, the power supply pin corresponding to the positive power supply of the tire pressure monitoring controller corresponds to the power supply pin in the first CAN bus short circuiter connected to the positive power supply of the vehicle.

[0019] Preferably, when the reversing radar module is assembled with the second CAN bus short circuiter, the power supply pin corresponding to the positive pole of the power supply of the reversing radar module corresponds to the power supply pin in the first CAN bus short circuiter connected to the output end of the reverse switch.

[0020] Preferably, when the reversing camera module is assembled with the first CAN bus short circuiter, the power supply pin corresponding to the positive power supply terminal of the reversing camera module corresponds to the power supply pin in the first CAN bus short circuiter connected to the power output terminal of the instrument cluster.

[0021] Preferably, the first plug interface and the second plug interface are provided with ground pins, and the ground pins are connected to the vehicle ground.

[0022] Preferably, the first plug interface and the second plug interface are quick plug structures.

[0023] Preferably, the first plug interface and the second plug interface adopt 8-pin interfaces.

[0024] The present invention provides an expansion circuit for an automotive instrument cluster. This circuit separates the connection circuit between the instrument cluster and optional electronic devices through a CAN bus short-circuiter and a mating interface, dividing the circuit into two parts: a common circuit and an optional electrical configuration. The mating connection enables corresponding electrical functions. This circuit solves the problem of low modularity and universality in the connection circuits and wiring harnesses of existing automotive instrument clusters, which cannot easily accommodate the installation of optional electronic devices. The circuit can improve the modularity and universality of the circuit corresponding to the electrical configuration, thereby enhancing the convenience of adding or removing electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments.

[0026] Figure 1 The present invention is a schematic diagram of an expansion circuit for an automobile combination instrument.

[0027] Figure 2 The diagram is a segmented schematic diagram of an expansion circuit for an automobile combination instrument provided by an embodiment of the present invention.

[0028] Figures 3 to 8 is a schematic diagram of an example of an expansion circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings and implementation methods.

[0030] In view of the problem that the connection circuits and wiring harnesses of current automobile combination instruments have low modularity and universality, and cannot be conveniently adapted to the installation of optional electronic equipment, the present invention provides an extension circuit for automobile combination instruments, which solves the problem that the connection circuits and wiring harnesses of existing automobile combination instruments have low modularity and universality, and cannot be conveniently adapted to the installation of optional electronic equipment. It can improve the level of modularity and universality of the circuits corresponding to the electrical configuration, and improve the convenience of adding or reducing the installation of electrical equipment.

[0031] like Figure 1As shown, an expansion circuit for an automotive instrument cluster includes: a first CAN bus breaker 1, a second CAN bus breaker 2, a first socket 3, and a second socket 4. Both the first and second sockets 3 and 4 are equipped with CAN bus terminal pins and power supply pins. The first CAN bus breaker 1 is connected to the corresponding CAN bus terminal pin harnesses of the instrument cluster and the first socket 3, respectively. The power output of the instrument cluster is connected to the power supply pin harness of the first socket 3. The second CAN bus breaker 2 is connected to the corresponding CAN bus terminal harness of the second socket 4. An optional electrical configuration module is connected to the corresponding CAN bus terminal pins and power supply pins of the second socket 4. The first and second sockets 3 and 4 are mating interfaces with male and female terminals. When the first and second sockets are separated, the instrument cluster and the corresponding circuit of the optional electrical configuration module are separated. When the first and second sockets are connected, the instrument cluster and the corresponding circuit of the optional electrical configuration module are mated.

[0032] Specifically, according to the principle that the circuits corresponding to each electrical configuration can maximize modularization, generalization and cost optimization, a circuit dividing line is set to divide the circuit into two parts, one is the general part and the other is the optional part.

[0033] In one embodiment, if Figure 2 As shown, according to the principle that the circuits corresponding to each electrical configuration can maximize modularization, universalization and cost optimization, a circuit dividing line is set, which divides the circuit diagram of the existing vehicle model into part A and part B. The circuits cut off in part A are named A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, and A11, and the circuits cut off in part B are named B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, and B11. The pins with the same signal source are merged, as shown in the figure. Figure 2 As shown, the B4 and B8 pins of part B are both CAN_H and are combined into B13 (see Figure 1 ); Pins B5 and B9 are both CAN_L and are combined into B14 (see Figure 1 ); Pins B6 and B10 are both negative poles of the power supply and are combined into B12 (see Figure 1); The same applies to Part A; Due to the special nature of CAN communication wires, inline connection is not allowed. Therefore, a CAN bus circuit breaker needs to be added for switching after the CAN lines are merged. Add a matching interface at the circuit interrupted by the dividing line. According to the number of pins after the merger, select the first 8-pin plug interface and the second 8-pin plug interface respectively. The first plug interface and the second plug interface are male and female to each other and can be matched and connected. The pins in the first plug interface are A1 / A2 / A3 / A7 / A11 / A12 / A13 / A14, and the pins in the second plug interface are B1 / B2 / B3 / B7 / B11 / B12 / B13 / A14. After adding the matching interface, Part A becomes the common part.

[0034] Determine the circuit diagram that corresponds to your electrical configuration:

[0035] (1) Optional reversing camera, tire pressure monitoring controller, and reversing radar configuration, such as Figure 1 In the middle part C, part C is matched and connected with part A to realize the function.

[0036] (2) Optional reversing camera and tire pressure monitoring controller: Figure 3 In the G part, according to the selected configuration, determine the pins used in the second plug interface are B1 / B2 / B3 / B7 / B12 / B13 / A14, and connect the G part with the A part to realize the function.

[0037] (3) Optional reversing camera and reversing radar: Figure 4 In the H part, according to the selected configuration, determine the pins used in the second plug interface are B1 / B2 / B3 / B11 / B12 / B13 / A14, and connect the H part with the A part to realize the function.

[0038] (4) Optional tire pressure monitoring controller, reversing radar: Figure 5 In the I part, according to the selected configuration, determine the pins used in the second plug interface are B7 / B11 / B12 / B13 / A14, and connect the I part with the A part to realize the function.

[0039] (5) Optional reversing camera: Figure 6 In the D part, according to the selected configuration, determine the pins used in the second plug interface are B1 / B2 / B3, and connect the D part with the A part to realize the function.

[0040] (6) Optional tire pressure monitoring controller: Figure 7 In the E part, according to the selected configuration, determine the pins used in the second plug interface are B12 / B13 / B14 / B7, and connect the E part with the A part to realize the function.

[0041] (7) Optional reversing radar: Figure 8 In the F part, according to the selected configuration, determine the pins used in the second plug interface are B12 / B13 / B14 / B11, and connect the F part with the A part to realize the function.

[0042] After reasonably dividing the circuit of the existing vehicle model into two parts and adding a matching interface, part A of the present invention is the general circuit part. At the same time, according to the optional electrical configuration of the vehicle model, the corresponding circuit is designed to be matched and connected with part A to realize the corresponding electrical function.

[0043] The circuit also includes: a reverse gear switch S; the reverse gear switch S is connected in series between the positive electrode of the vehicle power supply and the power input end of the combination instrument, and the reverse gear switch S conducts the electrical connection between the positive electrode of the vehicle power supply and the power input end of the combination instrument when the vehicle manual gear is in the reverse gear position.

[0044] Furthermore, the first CAN bus circuit breaker is provided with a plurality of power supply pins for use with a plurality of optional electrical configuration modules.

[0045] Furthermore, at least one power supply pin in the first CAN bus circuit breaker is connected to the positive pole of the vehicle power supply, and at least one power supply pin is connected to the output end of the reverse gear switch.

[0046] Furthermore, when the tire pressure monitoring controller is assembled with the second CAN bus short circuiter, the power supply pin corresponding to the positive power supply of the tire pressure monitoring controller corresponds to the power supply pin in the first CAN bus short circuiter connected to the positive power supply of the vehicle.

[0047] In practical applications, such as Figure 1 、 Figure 3 、 Figure 5 and Figure 7 As shown in the figure, the tire pressure monitoring controller T1 and T2 pins receive high-level and low-level signals from the positive and negative poles of the power supply respectively. When the tire pressure monitoring controller T receives the pressure signal from the tire pressure sensor, it sends the pressure signal to the vehicle CAN bus through the T3 and T4 pins. At this time, the instrument cluster reads the tire pressure signal on the CAN bus through the Z6 and Z5 pins, thereby realizing the function of the instrument cluster to display the tire pressure.

[0048] Furthermore, when the reversing radar module is assembled with the second CAN bus short circuiter, the power supply pin corresponding to the positive pole of the power supply of the reversing radar module corresponds to the power supply pin in the first CAN bus short circuiter connected to the output end of the reverse gear switch.

[0049] In practical applications, such as Figure 1 、 Figure 4 、 Figure 5 and Figure 8 As shown in the figure, when the vehicle is in reverse gear, that is, the reverse gear switch S is closed, the switch contacts S1 and S2 are turned on, the R1 pin of the reversing radar receives the high-level signal from the positive pole of the power supply, and the R2 pin receives the low-level signal from the negative pole of the power supply. When the reversing radar receives the distance signal, it sends the distance signal to the vehicle CAN bus through the R3 and R4 pins. At this time, the instrument cluster reads the reversing radar distance signal on the CAN bus through the Z6 and Z5 pins, thereby realizing functions such as displaying sound or alarm prompts on the instrument cluster.

[0050] Furthermore, when the reversing camera module is assembled with the first CAN bus short circuiter, the power supply pin corresponding to the positive power supply terminal of the reversing camera module corresponds to the power supply pin in the first CAN bus short circuiter connected to the power output terminal of the instrument cluster.

[0051] In practical applications, such as Figure 1 、 Figure 3 、 Figure 4 and Figure 6 As shown in the figure, when the vehicle is in reverse gear, that is, the reverse gear switch S is closed, the switch contacts S1 and S2 are connected, and the instrument cluster Z8 pin receives a high-level signal from the positive pole of the power supply. At this time, the instrument cluster supplies power to the reversing camera C1 pin through the Z1 pin, and the reversing camera C sends the reversing video signal to the instrument cluster Z2 and Z3 pins through the C2 and C3 pins, thereby realizing the function of displaying the reversing video on the instrument cluster.

[0052] Furthermore, the first plug interface and the second plug interface are provided with ground pins, and the ground pins are connected to the vehicle ground.

[0053] Furthermore, the first plug interface and the second plug interface are quick plug structures.

[0054] Furthermore, the first plug interface and the second plug interface adopt 8-pin interfaces.

[0055] As can be seen, the present invention provides an expansion circuit for an automotive instrument cluster. This circuit separates the connection circuit between the instrument cluster and optional electronic devices through a CAN bus short-circuiter and a mating interface, dividing the circuit into two parts: a common circuit portion and an optional electrical configuration. The corresponding electrical functions are achieved through mating connections. This solves the problem of low modularity and universality in the connection circuits and wiring harnesses of existing automotive instrument clusters, which cannot easily accommodate the installation of optional electronic devices. It improves the modularity and universality of the circuits corresponding to the electrical configuration, and enhances the convenience of adding or removing electrical equipment.

[0056] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. An expansion circuit for an automobile combination instrument, characterized in that: include: A first CAN bus short circuiter, a second CAN bus short circuiter, a first plug interface and a second plug interface; The first plug interface and the second plug interface are both provided with CAN bus terminal pins and power terminal pins; The first CAN bus short circuiter is respectively connected to the CAN bus terminal pin harness corresponding to the instrument cluster and the first plug interface; The power output end of the combined instrument is connected to the power pin harness of the first plug interface; The second CAN bus short circuiter is connected to the CAN bus terminal harness corresponding to the second plug interface; The optional electrical configuration module is connected to the CAN bus terminal pins and power pins corresponding to the second plug interface; The first plug interface and the second plug interface are mating interfaces and are male and female to each other; When the first plug interface is disconnected from the second plug interface, the instrument cluster and the corresponding circuit of the optional electrical configuration module are separated; When the first plug interface is plugged into the second plug interface, the instrument cluster is connected to the corresponding circuit of the optional electrical configuration module.

2. The expansion circuit for an automobile combination instrument according to claim 1, characterized in that: Also includes: Reverse gear switch; The reverse gear switch is connected in series between the positive pole of the vehicle power supply and the power input end of the combination instrument. When the vehicle manual gear is in the reverse gear position, the reverse gear switch conducts the electrical connection between the positive pole of the vehicle power supply and the power input end of the combination instrument.

3. The expansion circuit for an automobile combination instrument according to claim 2, characterized in that: The first CAN bus circuit breaker is provided with a plurality of power supply pins for use with a plurality of optional electrical configuration modules.

4. The expansion circuit for an automobile combination meter according to claim 3, characterized in that: At least one power supply end pin in the first CAN bus circuit breaker is connected to the positive pole of the vehicle power supply, and at least one power supply end pin is connected to the output end of the reverse gear switch.

5. The expansion circuit for automobile combination meter according to claim 4, characterized in that: When the tire pressure monitoring controller is assembled with the second CAN bus short circuiter, the power supply pin corresponding to the positive power supply of the tire pressure monitoring controller corresponds to the power supply pin in the first CAN bus short circuiter connected to the positive power supply of the vehicle.

6. The expansion circuit for an automobile combination meter according to claim 5, characterized in that: When the reversing radar module is assembled with the second CAN bus short circuiter, the power supply pin corresponding to the positive pole of the power supply of the reversing radar module corresponds to the power supply pin in the first CAN bus short circuiter connected to the output end of the reverse gear switch.

7. The expansion circuit for an automobile combination meter according to claim 6, characterized in that: When the reversing camera module is assembled with the first CAN bus short circuiter, the power supply pin corresponding to the positive power supply terminal of the reversing camera module corresponds to the power supply pin in the first CAN bus short circuiter connected to the power output terminal of the combination instrument.

8. The expansion circuit for an automobile combination meter according to claim 7, characterized in that: The first plug interface and the second plug interface are provided with ground pins, and the ground pins are connected to the vehicle ground.

9. The expansion circuit for an automobile combination meter according to claim 8, characterized in that: The first plug-in interface and the second plug-in interface are quick plug-in structures.

10. The expansion circuit for automobile combination meter according to claim 9, characterized in that: The first plug interface and the second plug interface adopt 8-pin interfaces.

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