A low-cost high-compatibility commercial vehicle speed signal switching system

Abstract

The utility model discloses a low -cost high compatibility's commercial vehicle speed signal switching system relates to the field of automobile electrical, including including driving recorder, whole car instrument, speed sensor, speed signal switching circuit, wherein, speed signal switching circuit includes stable function area and dynamic function area, and stable function area includes the wire for realizing the fixed connection between driving recorder and whole car instrument, and carries out signal transmission, and dynamic function area includes the wire for realizing the connection switching between speed sensor and driving recorder or whole car instrument, and carries out signal and power transmission, be equipped with speed sensor power supply anodic port, speed sensor power supply cathode port, speed pulse signal input port, encryption signal port on driving recorder. The utility model can realize the flexible switching of speed signal under the condition of not needing to reform, ensures that vehicle can normally show speed under the scene of having driving recorder or not having driving recorder.

Description

Technical Field

[0001] This utility model relates to the field of automotive electrical systems, specifically to a low-cost, highly compatible commercial vehicle speed signal switching system. Background Technology

[0002] With the rapid globalization of the automotive industry, developing products that meet the regulatory requirements of different countries and regions overseas, and providing local users with low-maintenance, highly adaptable services to enhance product competitiveness and user satisfaction, has become a top priority for vehicle OEMs. However, different countries and regions have different regulations regarding the installation of dashcams. For example, some regions, such as European countries, require dashcams as mandatory, while others, such as some Southeast Asian countries, do not. Furthermore, in regions like South America, some countries do not require dashcams, while others do. Vehicle users in these regions often travel between different South American countries for cargo delivery purposes.

[0003] When a vehicle travels from an area where driving recorders are not mandatory to an area where they are mandatory, in addition to installing a driving recorder, the vehicle user also needs to modify the vehicle's electrical control system. This modification involves a large number of wiring harness changes, which is not only complex, time-consuming, and costly, but more importantly, because the modification process involves the destruction and reconnection of a large number of wires, the reliability of the modified vehicle cannot be guaranteed. Conversely, when a vehicle travels from an area where driving recorders are mandatory to an area where they are not mandatory, the same problems will be faced if the driving recorder is removed.

[0004] The fundamental reason for the complexity of the modification process lies in the difference in how overseas dashcams process vehicle speed signals compared to domestic dashcams. In domestic dashcams, the speed sensor is directly connected to the instrument cluster, which provides power and ground to the sensor. The sensor sends speed pulse signals to the instrument cluster, which converts these signals into speed information for display and broadcasts them via a network bus to other vehicle controllers that require speed signals. While overseas dashcams vary widely, their speed signal processing method is generally the same: the speed sensor is directly connected to the dashcam, which provides power and ground. Additionally, there is an extra line between the dashcam and the speed sensor for transmitting encrypted signals. The sensor sends speed pulse signals to the dashcam, which receives and records them, then forwards them to the instrument cluster for speed display. The instrument cluster then broadcasts these signals to other vehicle controllers that require speed signals via a network bus. In other words, the vehicle speed signal must first be connected to the driving recorder, and only after the driving recorder processes it can it be forwarded to the instrument panel for the vehicle to use the speed signal normally. If only a driving recorder is installed without any other modifications, the speed signal cannot be connected to the driving recorder, which does not meet the regulatory requirements; if only the driving recorder is removed without any other modifications, the speed signal will be interrupted due to the removal of the driving recorder, and it will not be able to be connected to the instrument panel. The vehicle will not be able to display speed information, nor will it be able to send speed signals to other controllers in the vehicle, and the vehicle will not be able to be used normally.

[0005] The way overseas dashcams process vehicle speed signals makes the modification process extremely complex. For example, when a vehicle without a dashcam travels from an area where dashcams are not mandatory to an area where they are, installing a dashcam requires changing the connection of the speed sensor's power, ground, and speed pulse signal lines from the instrument cluster to the dashcam. An additional line for transmitting encrypted signals to the dashcam also needs to be added. Because the connectors, terminal types, layouts, and line lengths of the instrument cluster and dashcam are different, and the wiring is distributed across the cab, roof, chassis, and transmission harnesses, the modification process involves numerous parts disassembly, damage to wiring, and reconnection and lengthening. The modification operation is exceptionally complex, time-consuming, and costly, and reliability is at risk due to the damage and reconnection of wiring. The reverse is also true.

[0006] Therefore, due to the differences in the connector models and terminal types of the instrument panel and driving recorder, modification requires changing the wiring harness connectors and their terminals, involving the removal and reconnection of terminals, as well as damage and reconnection of the wiring harness. Furthermore, because the instrument panel and driving recorder are located in different positions, the wiring lengths differ, and the wiring extends throughout the driver's cab, roof, chassis, and gearbox. The modification process involves numerous parts disassembly, and the wiring is damaged and reconnected in multiple places due to lengthening or shortening. Therefore, the existing modification process is exceptionally complex, time-consuming, costly, and has poor compatibility, especially impacting the timeliness of cross-border logistics vehicles. Moreover, the damage and reconnection of the wiring poses a reliability risk. Utility Model Content

[0007] This application provides a low-cost and highly compatible commercial vehicle speed signal switching system that can flexibly switch speed signals without modification, ensuring that the vehicle speed can be displayed normally in scenarios with or without a driving recorder.

[0008] In a first aspect, embodiments of this application provide a low-cost, highly compatible commercial vehicle speed signal switching system. The low-cost, highly compatible commercial vehicle speed signal switching system includes a driving recorder, a vehicle instrument cluster, a vehicle speed sensor, and a speed signal switching circuit. The speed signal switching circuit includes: The stabilization functional area includes wires used to establish a fixed connection between the driving recorder and the vehicle's instrument panel and to transmit signals. The dynamic functional area includes wires for switching between the vehicle speed sensor and the driving recorder or vehicle instrument panel, and for transmitting signals and power.

[0009] In conjunction with the first aspect, in one implementation method, The driving recorder is equipped with a vehicle speed sensor power supply positive port, a vehicle speed sensor power supply negative port, a vehicle speed pulse signal input port, and an encryption signal port; The vehicle instrument panel is equipped with a positive power supply port for the vehicle speed sensor, a negative power supply port for the vehicle speed sensor, and a vehicle speed pulse signal input port.

[0010] In conjunction with the first aspect, in one implementation method, The driving recorder is also equipped with a vehicle speed pulse signal output port, and the vehicle speed pulse signal output port of the driving recorder is fixedly connected to the vehicle speed pulse signal input port of the vehicle instrument.

[0011] In conjunction with the first aspect, in one implementation method, The vehicle speed sensor is equipped with a positive power input port, a negative power input port, a vehicle speed pulse signal output port, and a vehicle speed encryption signal port.

[0012] In conjunction with the first aspect, in one implementation method, The vehicle speed sensor integrates its power input positive port, power input negative port, vehicle speed pulse signal output port, and vehicle speed encryption signal port to form a third electrical interface.

[0013] In conjunction with the first aspect, in one implementation method, The vehicle speed sensor power supply positive port, vehicle speed sensor power supply negative port, vehicle speed pulse signal input port, and encryption signal port of the driving recorder are integrated to form the first electrical interface; The vehicle speed sensor positive power supply port, vehicle speed sensor negative power supply port, and vehicle speed pulse signal input port of the vehicle instrument are integrated to form a second electrical interface.

[0014] In conjunction with the first aspect, in one implementation method, When there is a need to use a driving recorder, the third electrical interface is connected to the first electrical interface.

[0015] In conjunction with the first aspect, in one implementation method, When the third electrical interface is connected to the first electrical interface, the positive power supply port of the vehicle speed sensor of the driving recorder is connected to the positive power supply input port of the vehicle speed sensor, the negative power supply port of the vehicle speed sensor of the driving recorder is connected to the negative power supply input port of the vehicle speed sensor, the vehicle speed pulse signal input port of the driving recorder is connected to the vehicle speed pulse signal output port of the vehicle speed sensor, and the encryption signal port of the driving recorder is connected to the vehicle speed encryption signal port of the vehicle speed sensor.

[0016] In conjunction with the first aspect, in one implementation method, When there is no need to use the driving recorder, the third electrical interface is connected to the second electrical interface.

[0017] In conjunction with the first aspect, in one implementation method, When the third electrical interface is connected to the second electrical interface, the positive power supply port of the vehicle speed sensor of the vehicle instrument is connected to the positive power supply input port of the vehicle speed sensor, the negative power supply port of the vehicle speed sensor of the vehicle instrument is connected to the negative power supply input port of the vehicle speed sensor, and the vehicle speed pulse signal input port of the vehicle instrument is connected to the vehicle speed pulse signal output port of the vehicle speed sensor.

[0018] The beneficial effects of the technical solutions provided in this application include: Through a unique circuit design, flexible switching of vehicle speed signals can be achieved without modification, ensuring that the vehicle speed can be displayed normally in scenarios with or without a driving recorder. It is easy to operate, takes very little time, is low in cost, and has high reliability, without the need for circuit damage or reconnection, and has high adaptability to different regions. At the same time, compared with existing solutions, this application solution requires no modification, which greatly improves the flexibility and reliability of achieving technical objectives and has high compatibility under different configuration requirements. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the low-cost, highly compatible commercial vehicle speed signal switching system of this application. Figure 2 This is a schematic diagram showing the connection between the third electrical interface and the first electrical interface in this application; Figure 3 This is a schematic diagram showing the connection between the third electrical interface and the second electrical interface in this application; Figure 4 This is a schematic diagram of signal transmission between the vehicle speed sensor and the actuator. Figure 5 This is a schematic diagram of the vehicle speed signal transmission logic in the existing scheme; Figure 6 This is a schematic diagram of the vehicle speed signal transmission logic in this application. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0023] Firstly, this application provides a low-cost and highly compatible commercial vehicle speed signal switching system. Through a unique circuit design, it can achieve flexible switching of vehicle speed signals without modification, ensuring that the vehicle speed can be displayed normally in scenarios with or without a driving recorder. It is easy to operate, takes very little time, is low in cost, and has high reliability. There is no damage or reconnection of the wiring, and it has high adaptability to different regions.

[0024] In one embodiment, reference is made to Figure 1 , Figure 1 This is a schematic diagram of the low-cost, highly compatible commercial vehicle speed signal switching system proposed in this application. Figure 1 As shown, the low-cost, high-compatibility commercial vehicle speed signal switching system includes: a driving recorder, a vehicle instrument panel, a vehicle speed sensor, and a speed signal switching circuit. The speed signal switching circuit includes a stable functional area and a dynamic functional area. Specifically, the low-cost, high-compatibility commercial vehicle speed signal switching system of this application consists of a driving recorder, a vehicle instrument panel, a vehicle speed sensor, and a speed signal switching circuit. The speed signal switching circuit includes a stable functional area and a dynamic functional area, as well as highly reliable first, second, and third electrical interfaces between these two parts. Through a unique circuit design, flexible switching of the speed signal can be achieved without modification, ensuring that the vehicle speed can be displayed normally whether a driving recorder is present or not. It is easy to operate, takes very little time, is low in cost, and has high reliability, eliminating the need for wiring damage or reconnection. It also has high adaptability to different regions.

[0025] The stabilization zone includes the wiring used to establish a fixed connection between the dashcam and the vehicle's instrument cluster, and to transmit signals. The stabilization zone refers to the connection between the dashcam and the vehicle's instrument cluster. This part of the connection is fixed; regardless of whether a dashcam is installed, the vehicle's instrument cluster needs to receive the vehicle speed signal to display the speed. The design goal of this part is to ensure stable signal transmission and compatibility.

[0026] The dynamic functional area includes the wiring used to switch the connection between the vehicle speed sensor and the driving recorder or vehicle instrument panel, as well as to transmit signals and power. The dynamic functional area refers to the switching of the connection between the vehicle speed sensor and the driving recorder or vehicle instrument panel. This function is dynamic, requiring the signal path to be switched depending on whether a driving recorder is installed on the vehicle. The design goal of this part is to achieve flexible signal switching while ensuring signal integrity and reliability.

[0027] Furthermore, the driving recorder is equipped with a positive power supply port for the vehicle speed sensor, a negative power supply port for the vehicle speed sensor, a vehicle speed pulse signal input port, and an encryption signal port. See also Figure 1As shown, B1 represents the positive power supply port of the vehicle speed sensor, B2 represents the negative power supply port of the vehicle speed sensor, B3 represents the vehicle speed pulse signal input port, and B4 represents the encryption signal port. These four ports are integrated, that is, the positive power supply port of the vehicle speed sensor, the negative power supply port of the vehicle speed sensor, the vehicle speed pulse signal input port, and the encryption signal port of the driving recorder are integrated to form the first electrical interface for connecting with the vehicle speed sensor.

[0028] The vehicle's instrument panel is equipped with a positive power supply port for the vehicle speed sensor, a negative power supply port for the vehicle speed sensor, and a vehicle speed pulse signal input port. (See also...) Figure 1 As shown, A35 represents the positive power supply port of the vehicle speed sensor, A31 represents the negative power supply port of the vehicle speed sensor, and A14 represents the vehicle speed pulse signal input port. These three ports are integrated, that is, the positive power supply port of the vehicle speed sensor, the negative power supply port of the vehicle speed sensor, and the vehicle speed pulse signal input port of the vehicle instrument are integrated to form a second electrical interface for connecting to the vehicle speed sensor.

[0029] Furthermore, the driving recorder is also equipped with a vehicle speed pulse signal output port, and the vehicle speed pulse signal output port of the driving recorder is fixedly connected to the vehicle speed pulse signal input port of the vehicle instrument panel. That is, the vehicle speed pulse signal output port on the driving recorder (see...) Figure 1 As shown, B6 represents the vehicle speed pulse signal output port, which is the output terminal of the vehicle speed pulse signal processed by the driving recorder. The vehicle speed pulse signal enters the vehicle speed pulse signal input port of the vehicle instrument panel through the corresponding wire. The function and circuit of this part are fixed, and regardless of the configuration, it always stably transmits the processed vehicle speed signal to the vehicle instrument panel. Furthermore, there is a connection between the negative power supply ports of the vehicle speed sensors.

[0030] Furthermore, the vehicle speed sensor has a positive power input port, a negative power input port, a vehicle speed pulse signal output port, and a vehicle speed encryption signal port. These four ports are integrated, forming a third electrical interface for connection to the first or second electrical interface. See also Figure 1As shown, wire 1411 is the power supply provided by the driving recorder or vehicle instrument panel to the speed sensor, and is connected to the positive power input port of the speed sensor; wire 1412 is the negative power supply provided by the driving recorder or vehicle instrument panel to the speed sensor, and is connected to the negative power input port of the speed sensor; wire 1413 is the output terminal of the speed sensor for the speed pulse signal to the driving recorder or vehicle instrument panel, and is connected to the speed pulse signal output port of the speed sensor; wire 1414 transmits the speed encryption signal and is adjacent to the speed encryption signal port of the speed sensor. This part of the speed sensor's function is dynamic and requires switching the signal path depending on whether a driving recorder is installed on the vehicle.

[0031] See Figure 2 As shown, when a driving recorder is present, the third electrical interface is connected to the first electrical interface; that is, when there is a need for driving recorder use, the third electrical interface and the first electrical interface are connected. At this time, the positive power supply port of the driving recorder's speed sensor is connected to the positive power input port of the speed sensor, the negative power supply port of the driving recorder's speed sensor is connected to the negative power input port of the speed sensor, the speed pulse signal input port of the driving recorder is connected to the speed pulse signal output port of the speed sensor, and the encryption signal port of the driving recorder is connected to the speed encryption signal port of the speed sensor. The driving recorder provides power and ground to the speed sensor. The speed pulse signal and encryption signal are transmitted to the driving recorder, and the driving recorder stably transmits the processed speed signal from the speed pulse signal output port to the speed pulse signal input port of the vehicle's instrument panel, thereby obtaining the vehicle speed.

[0032] See Figure 3 As shown, when there is no driving recorder, the third electrical interface is connected to the second electrical interface. That is, when there is no need for a driving recorder, the third electrical interface and the second electrical interface are connected. At this time, the positive power supply port of the vehicle speed sensor on the instrument cluster is connected to the positive power supply input port of the vehicle speed sensor, the negative power supply port of the vehicle speed sensor on the instrument cluster is connected to the negative power supply input port of the vehicle speed sensor, and the vehicle speed pulse signal input port of the instrument cluster is connected to the vehicle speed pulse signal output port of the vehicle speed sensor. The instrument cluster provides power and ground to the vehicle speed sensor, the encrypted signal is shielded, and the vehicle speed pulse signal is transmitted to the vehicle speed pulse signal input port of the instrument cluster to obtain the vehicle speed.

[0033] It should be noted that the third electrical interface is connected to either the first or second electrical interface. The function and circuitry of this part are dynamic and switchable, allowing for flexible switching of the vehicle speed signal between different configurations to meet varying requirements. Since complete acquisition of the vehicle speed signal is achieved in any switching state, this solution ensures signal integrity. Furthermore, the reliable and durable matching of the third electrical interface with both the first and second electrical interfaces ensures signal reliability. The driving recorder in this application can be a VDO driving recorder.

[0034] This application presents a low-cost, highly compatible commercial vehicle speed signal switching system. Designed based on the existing electrical architecture, it redefines the transmission logic of the speed signal without affecting the vehicle's existing electrical structure. Compared to the existing electrical architecture where the speed sensor signal enters the receiver (controller) for calculation and then outputs to the actuator for execution, see [link to relevant documentation]. Figure 4 As shown, this application enables the receiver to switch freely between the driving recorder and the vehicle instrument panel, but the vehicle speed sensor and actuator (the vehicle instrument panel displays the vehicle speed and sends the vehicle speed message to the vehicle CAN bus) remain unchanged, the overall electrical architecture remains unchanged, and there is no impact on the vehicle speed displayed on the vehicle instrument panel or on other nodes on the vehicle CAN bus receiving the vehicle speed message.

[0035] It should be further noted that, see [link / reference] Figure 5 As shown, the vehicle speed signal transmission logic of the existing solution has two different transmission logics for the two states of having a driving recorder and not having a driving recorder. Moreover, the transmission logics corresponding to these two states are mutually exclusive. If a switch between the two logics is required, it can only be achieved through physical-level modifications.

[0036] The low-cost, highly compatible commercial vehicle speed signal switching system of this application has the following speed signal transmission logic: Figure 6 As shown, the same set of transmission logic can be used for either the presence or absence of a driving recorder.

[0037] In summary, existing solutions, achieved through complex modifications, cannot guarantee stable transmission of vehicle speed signals under different configurations. In contrast, the stable functional area design of this application addresses different configurations and usage scenarios through unchanging wiring and reliable interfaces, ensuring stable and distortion-free transmission of vehicle speed pulse signals. The dynamic functional area design, through the flexibility of signal switching, is compatible with different usage scenarios and ensures signal integrity and reliable signal transmission.

[0038] This application takes a system architecture approach, rather than simply modifying the physical layer of existing solutions. Existing solutions focus only on the physical operations of later wiring harness modifications, centered on mechanical connections and adjustments. This application, however, designs from the perspective of electrical architecture, redefining the transmission logic of vehicle speed signals. It embeds the concepts and functions of "compatibility" and "switchability" into the vehicle's existing electrical architecture, and this embedding not only does not affect the existing electrical architecture but also achieves architectural-level optimization. This application differs from traditional modification solutions; it is not simply a matter of physical connections being placed beforehand, but rather an innovative system architecture design approach. This architecture enables the vehicle to possess "compatibility / adaptability" capabilities under different regulatory requirements, efficiently and stably transmitting vehicle speed signals, greatly improving the vehicle's versatility and adaptability, rather than simply requiring independent hardware modifications.

[0039] This application overcomes the limitations of traditional wiring harness modification. Traditional wiring harness modification schemes are static, one-way, physical operations. Not only do they cause irreversible damage to the wiring harness after modification, reducing signal transmission reliability and vehicle safety, but the modification itself is also irreversible—it can only be done in one direction (e.g., changing from no driving recorder to having one, or vice versa; or adding or removing encryption cables). If the modification is reversed again, the wiring harness is essentially rendered unusable. Therefore, traditional modification schemes have inherent limitations. This application, however, uses a dynamic design approach, allowing for flexible and seamless switching under different regulatory / operating condition requirements. It possesses dynamic adaptability and overcomes the limitations of traditional wiring harness modification.

[0040] This application is scalable. It provides future technological upgrades / expansion space that existing solutions do not have. Because it is designed from the electrical architecture level and breaks through the limitations of traditional modification methods, future technological expansions can be carried out based on it. For example, functions such as adding driving recorder installation status indication reminders and signal connection abnormality alarm reminders can be added, all of which have the potential for expansion.

[0041] This application presents a low-cost, highly compatible commercial vehicle speed signal switching system. Through a unique circuit design, it can flexibly switch vehicle speed signals without modification, ensuring that the vehicle can display its speed normally whether or not a driving recorder is present. It is easy to operate, takes very little time, is low in cost, and has high reliability, without requiring damage or reconnection to the wiring. It also has high adaptability to different regions. Furthermore, compared to existing solutions, this application's solution requires no modification, greatly improving the flexibility and reliability of achieving the technical objectives and providing high compatibility under different configuration requirements.

[0042] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0043] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0045] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a specific manner. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; the word "and / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. In addition, in the description of the embodiments of this application, "multiple" refers to two or more.

[0046] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A low-cost, highly compatible commercial vehicle speed signal switching system, characterized in that, The low-cost, highly compatible commercial vehicle speed signal switching system includes a driving recorder, vehicle instrument cluster, vehicle speed sensor, and speed signal switching circuit, wherein the speed signal switching circuit includes: The stabilization functional area includes wires used to establish a fixed connection between the driving recorder and the vehicle's instrument panel and to transmit signals. The dynamic functional area includes wires for switching between the vehicle speed sensor and the driving recorder or vehicle instrument panel, and for transmitting signals and power.

2. The low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 1, characterized in that: The driving recorder is equipped with a vehicle speed sensor power supply positive port, a vehicle speed sensor power supply negative port, a vehicle speed pulse signal input port, and an encryption signal port; The vehicle instrument panel is equipped with a positive power supply port for the vehicle speed sensor, a negative power supply port for the vehicle speed sensor, and a vehicle speed pulse signal input port.

3. The low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 2, characterized in that: The driving recorder is also equipped with a vehicle speed pulse signal output port, and the vehicle speed pulse signal output port of the driving recorder is fixedly connected to the vehicle speed pulse signal input port of the vehicle instrument.

4. The low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 2, characterized in that: The vehicle speed sensor is equipped with a positive power input port, a negative power input port, a vehicle speed pulse signal output port, and a vehicle speed encryption signal port.

5. A low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 4, characterized in that: The vehicle speed sensor integrates its power input positive port, power input negative port, vehicle speed pulse signal output port, and vehicle speed encryption signal port to form a third electrical interface.

6. The low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 5, characterized in that: The vehicle speed sensor power supply positive port, vehicle speed sensor power supply negative port, vehicle speed pulse signal input port, and encryption signal port of the driving recorder are integrated to form the first electrical interface; The vehicle speed sensor positive power supply port, vehicle speed sensor negative power supply port, and vehicle speed pulse signal input port of the vehicle instrument are integrated to form a second electrical interface.

7. A low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 6, characterized in that: When there is a need to use a driving recorder, the third electrical interface is connected to the first electrical interface.

8. A low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 7, characterized in that: When the third electrical interface is connected to the first electrical interface, the positive power supply port of the vehicle speed sensor of the driving recorder is connected to the positive power supply input port of the vehicle speed sensor, the negative power supply port of the vehicle speed sensor of the driving recorder is connected to the negative power supply input port of the vehicle speed sensor, the vehicle speed pulse signal input port of the driving recorder is connected to the vehicle speed pulse signal output port of the vehicle speed sensor, and the encryption signal port of the driving recorder is connected to the vehicle speed encryption signal port of the vehicle speed sensor.

9. A low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 6, characterized in that: When there is no need to use the driving recorder, the third electrical interface is connected to the second electrical interface.

10. A low-cost, highly compatible commercial vehicle speed signal switching system as described in claim 9, characterized in that: When the third electrical interface is connected to the second electrical interface, the positive power supply port of the vehicle speed sensor of the vehicle instrument is connected to the positive power supply input port of the vehicle speed sensor, the negative power supply port of the vehicle speed sensor of the vehicle instrument is connected to the negative power supply input port of the vehicle speed sensor, and the vehicle speed pulse signal input port of the vehicle instrument is connected to the vehicle speed pulse signal output port of the vehicle speed sensor.

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