Differential lock device and vehicle

Abstract

The utility model discloses a differential lock device and a vehicle. The differential lock device comprises a voltage conversion module, a current sampling module, a voltage comparison module, a protection module and a sampling resistor, the voltage conversion module is electrically connected with the voltage comparison module, and the voltage conversion module is used for providing a reference voltage value for the voltage comparison module; the current sampling module is electrically connected with the sampling resistor and the voltage comparison module, and the current sampling module is used for obtaining a sampling voltage value corresponding to the sampling resistor and sending the sampling voltage value to the voltage comparison module; the voltage comparison module is electrically connected with the protection module, and the voltage comparison module is used for receiving the reference voltage value and the sampling voltage value and controlling the protection module to be disconnected. The voltage comparison module is arranged to judge the sampling voltage value, and the protection module is controlled to be disconnected when the sampling voltage value is greater than the reference voltage value, so that a hardware overcurrent turn-off function is realized based on a hardware structure, and the response efficiency of the overcurrent turn-off function is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle control, in particular to a differential lock device and a vehicle. Background Art

[0002] The differential is a crucial component of a vehicle's drivetrain, particularly in four-wheel drive systems. The coordinated operation of the center differential, front differential, and rear differential ensures excellent traction and maneuverability in a variety of complex road conditions. The differential requires control by a differential lock to ensure safe driving. Most existing differential locks utilize software control logic to implement overcurrent shutdown to control the differential. This software has a long response time, which is also affected by environmental factors, potentially posing a risk to vehicle safety. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is how to improve the response efficiency of the overcurrent protection function.

[0004] In order to solve at least one of the above-mentioned technical problems, the present utility model discloses a differential lock device and a vehicle.

[0005] According to one aspect of the present disclosure, a differential lock device is provided, comprising:

[0006] Voltage conversion module, current sampling module, voltage comparison module, protection module and sampling resistor;

[0007] The voltage conversion module is electrically connected to the voltage comparison module, and the voltage conversion module is used to provide a reference voltage value for the voltage comparison module;

[0008] The current sampling module is connected in parallel with the sampling resistor and is electrically connected to the voltage comparison module; the current sampling module is used to obtain a sampled voltage value corresponding to the sampling resistor and send the sampled voltage value to the voltage comparison module;

[0009] The voltage comparison module is electrically connected to the protection module. The voltage comparison module is used to receive the reference voltage value and the sampled voltage value, and control the protection module to be opened or closed.

[0010] According to a second aspect of the present disclosure, a vehicle is provided, comprising a differential lock device as described in any embodiment of the present application; the vehicle comprises at least two wheels, and the differential lock device is arranged between opposing wheels.

[0011] The implementation of this utility model has the following beneficial effects:

[0012] In the present invention, a differential module is provided including a voltage conversion module, a current sampling module, a voltage comparison module, a protection module and a sampling resistor. The voltage conversion module provides a reference voltage for determining whether an overcurrent shutdown function needs to be executed. The current adopting module cooperates with the sampling resistor to calculate the sampling voltage, and the reference voltage and the sampling voltage are compared by the voltage comparison module to determine whether it is necessary to control the device to be disconnected to realize the overcurrent shutdown function.

[0013] Compared with the response time of the prior art that executes the overcurrent shutdown function through software control logic, the differential lock device disclosed in the present invention has a response time of approximately 10ms to implement the overcurrent shutdown function, which significantly improves the response efficiency and reduces the risk of hardware loss due to timely response; and the overcurrent shutdown function is executed based on hardware, which is less affected by the vehicle's environment, thereby improving the safety performance and anti-interference ability of the differential lock device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the following will briefly introduce the drawings required for use in the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic diagram of a differential lock device provided by an embodiment of the present utility model;

[0016] Figure 2 A system architecture diagram of a vehicle using a differential lock device provided by an embodiment of the present utility model;

[0017] Figure 3 This is a layout diagram of a differential lock device provided in an embodiment of the present utility model.

[0018] Among them, the above-mentioned figure marks can correspond respectively to: 100-voltage conversion module, 200-current sampling module, 300-voltage comparison module, 400-protection module, 500-sampling resistor, 1-differential lock device, 2-main power supply, 3-vehicle load, 4-center differential, 5-engine transmission and front axle differential, 6-rear axle differential, 7-front axle, 8-rear axle. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this utility model.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0022] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0023] The term "and / or" herein simply describes an association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can represent the existence of three situations: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" herein refers to any combination of at least two of any one or more of a plurality of items. For example, "at least one of A, B, and C" can represent any one or more elements selected from the set consisting of A, B, and C.

[0024] In addition, numerous specific details are provided in the following detailed description to better illustrate the present disclosure. Those skilled in the art will appreciate that the present disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main points of the present disclosure.

[0025] Figure 1A schematic diagram showing a differential lock device; see Figure 1 , a differential lock device may include:

[0026] Voltage conversion module 100, current sampling module 200, voltage comparison module 300, protection module 400 and sampling resistor 500;

[0027] The voltage conversion module 100 is electrically connected to the voltage comparison module 300 , and the voltage conversion module 100 is used to provide a reference voltage value for the voltage comparison module 300 ;

[0028] The voltage conversion module 100 provides a reference voltage value for the voltage comparison module 300. The reference voltage value can be a critical value of the supply voltage value, preferably half of the supply voltage value. That is, the reference voltage value can be half of the supply voltage value. Since the supply voltage value is typically 5V, 2.5V is preferably used as the reference voltage value in this embodiment to avoid judgment errors caused by voltage accuracy issues.

[0029] In addition, the voltage conversion module 100 can also be set to convert a non-reference voltage value into a reference voltage value, so that the voltage comparison module 300 can receive a stable reference value and perform voltage comparison with a stable reference value, thereby improving the reliability of overcurrent shutdown control.

[0030] The current sampling module 200 is connected in parallel with the sampling resistor 500 and is electrically connected to the voltage comparison module 300; the current sampling module 200 is used to obtain a sampled voltage value corresponding to the sampling resistor 500 and send the sampled voltage value to the voltage comparison module 300;

[0031] The current sampling module 200 includes a sampling unit and a processing unit; the sampling unit is used to sample the voltage across the sampling resistor 500 to obtain the sampled voltage value;

[0032] The processing unit is configured to perform voltage amplification processing on the sampled voltage value, and send the amplified sampled voltage value to the voltage comparison module 300 .

[0033] The current sampling module 200 can be divided into two parts according to its function, namely, a sampling unit for sampling the sampling resistor 500, and a processing unit for amplifying the sampled value. The sampling unit can be a current sampler, and the processing unit can be an error amplifier. The current sampler samples the voltage across the sampling resistor 500 to obtain a sampled voltage value, which is then input into the error amplifier for amplification to obtain an amplified sampled voltage value. The amplified sampled voltage value is then sent to the voltage comparison module 300.

[0034] Amplifying the sampled voltage value can reduce the impact of noise and interference and increase the signal amplitude, thereby improving measurement accuracy. In addition, the amplitude of the output signal can be adjusted through the processing unit to adapt to different measurement ranges, ensuring that the sampled signal matches the input requirements of the subsequent circuit, achieving seamless connection and normal operation.

[0035] The resistance value of the sampling resistor 500 is set between 0.01 mΩ and 100 mΩ; the resistance value of the sampling resistor 500 is set to 1 mΩ.

[0036] In a specific embodiment, the resistance of the sampling resistor 500 is inversely proportional to the current value. The resistance of the sampling resistor 500 is set between 0.01 mΩ and 100 mΩ. Preferably, the resistance of the sampling resistor is fixed at 1 mΩ. This can reduce loop power and the package size of the differential lock device 1, thereby reducing the manufacturing cost of the differential lock device 1. Alternatively, the resistance of the sampling resistor 500 can be adaptively modified, for example, selecting 2 mΩ as the resistance of the sampling resistor 500 within the range of 0.01 mΩ to 100 mΩ.

[0037] The voltage comparison module 300 is electrically connected to the protection module 400 . The voltage comparison module 300 is configured to receive the reference voltage value and the sampled voltage value, and control the protection module 400 to be open or closed.

[0038] Furthermore, the voltage comparison module 300 is used to compare the reference voltage value and the sampled voltage value, and provide an overcurrent protection signal to the protection module 400 .

[0039] For the voltage comparison module 300, a comparator can be selected to implement its function; according to its function, it can be regarded as two parts, namely, one part is a receiving unit for receiving the voltage value, and the other part is used to generate an overcurrent protection signal. After receiving the reference voltage value sent by the voltage conversion module 100 and the amplified sampled voltage value sent by the current sampling module, the reference voltage value and the amplified sampled voltage value are compared. When the amplified sampled voltage value is greater than the reference voltage value, it is determined that the current operating state is in an overcurrent state, an overcurrent protection signal is generated, and sent to the protection module 400.

[0040] like Figure 1 As shown, in the differential lock device 1, the sampling resistor 500 is connected to the main power supply 2, which is used to provide a supply voltage value. The protection module 400 is connected in series with the main power supply 2 and the vehicle load 3, so that the protection module 400 controls the connection between the vehicle load 3 and the main power supply 2. The protection module 400 is configured as a metal oxide semiconductor field effect transistor.

[0041] The protection module 400 in the differential lock device 1 can be considered a switch, serving to connect and disconnect the path. Any component capable of switching or closing the circuit can be selected for the protection module 400, provided that it complies with design and production specifications and is compatible with the circuit. A preferred embodiment is a MOSFET (metal oxide semiconductor field effect transistor) as the protection module 400. Specifically, the gate terminal of the MOSFET is coupled to the voltage comparison module to receive an overcurrent protection signal. Depending on the doping type, the source terminal is coupled to a sampling resistor and the drain terminal is coupled to a load, or the drain terminal is coupled to a sampling resistor and the source terminal is coupled to a load. The conduction and disconnection between the source and drain terminals of the MOSFET are determined based on the overcurrent protection signal output by the voltage comparison module. This satisfies the requirements for miniaturization and lightweight design of the differential lock device 1 and facilitates connection to a PCB structure. Upon receiving the overcurrent protection signal, the MOSFET disconnects, thereby disconnecting the vehicle load 3 from the main power supply 2, thereby avoiding overheating and the risk of vehicle burns caused by untimely disconnection.

[0042] The present utility model also provides a vehicle, comprising the differential lock device 1 as described in any of the above embodiments, wherein the vehicle comprises at least two wheels, and the differential lock device 1 can be configured between the opposing wheels; the vehicle can include at least one differential lock device 1, and one differential lock device 1 can be provided to control one differential, or one differential lock device 1 can be provided to control multiple differentials.

[0043] For example, one differential lock device 1 corresponds to one differential, that is, Figure 1 The differential lock device shown connects the signal receiving module of the differential with the protection module 400, that is, Figure 1The vehicle load 3 in the figure can be a differential, so that the protection module 400 is disconnected when it receives the overcurrent protection signal sent by the voltage comparison module 300, cutting off the connection between the main power supply 2 and the vehicle load 3, and realizing the overcurrent shutdown function.

[0044] A differential lock device 1 corresponds to multiple differentials, which can be achieved by adding a receiving path and a sending path corresponding to each module. Each differential corresponds to a path, and the acquisition of the sampled voltage value, the comparison between the voltage values, and the reception and transmission of the overcurrent protection signal are completed in the corresponding path, so that the switch corresponding to the differential in the protection module is disconnected after receiving the overcurrent protection signal.

[0045] In a specific embodiment, Figure 2 For a system architecture diagram of a vehicle using a differential lock device provided by an embodiment of the present invention, please refer to Figure 2 , the vehicle includes a front axle differential 5 and a rear axle differential 6;

[0046] The number of the differential lock devices 1 is configured to be at least two; the front axle differential 5 and the rear axle differential 6 each correspond to at least one differential lock device 1 .

[0047] One end of the vehicle has a front axle 7 for connecting the front wheels and the frame, and the other end has a rear axle 8 for connecting the rear wheels and the frame; accordingly, the front axle 7 is correspondingly provided with an engine transmission and a front axle differential 5, and a differential lock device 1 for controlling the front axle differential 5, and the rear axle 8 is correspondingly provided with a rear axle differential 6, and a differential lock device 1 for controlling the rear axle differential 6; and, a central differential 4 is connected to the two differential lock devices 1, and the engine transmission 5 is connected to the central differential 4; the protection module 400 in each differential lock device 1 is respectively connected to the signal receiving modules of the front axle differential 5 and the rear axle differential 6. When the differential locking needs to be controlled, the protection module 400 in the differential lock device 1 is disconnected to achieve the locking of the front axle differential 5 and the rear axle differential 6.

[0048] Figure 3 This is the layout diagram corresponding to the differential lock device disclosed in the present utility model, such as Figure 3 As shown, the differential lock device 1 is mounted on a PCB substrate and includes a voltage conversion module 100, a current sampling module 200, a voltage comparison module 300, a protection module 400, and a sampling resistor 500. The protection module 400 can be a MOSFET, and multiple MOSFETs can be used to work together. The configuration and arrangement of the components of the differential lock device 1 on the PCB substrate enables hardware-level overcurrent protection.

[0049] According to the above-mentioned embodiments of the present invention, a differential lock module is provided, including a voltage conversion module, a current sampling module, a voltage comparison module, a protection module, and a sampling resistor. The voltage conversion module provides a reference voltage for determining whether an overcurrent shutdown function needs to be executed. The current sampling module cooperates with the sampling resistor to calculate the sampled voltage, and the voltage comparison module compares the reference voltage with the sampled voltage to determine whether control, including device disconnection, is required to implement the overcurrent shutdown function. Compared to the response time of the prior art that executes the overcurrent shutdown function through software control logic, the differential lock device disclosed in the present invention has a response time of approximately 10ms to implement the overcurrent shutdown function, significantly improving response efficiency. This timely response reduces the risk of hardware loss. Furthermore, the hardware-based execution of the overcurrent shutdown function is less affected by the vehicle's environment, thereby improving the safety performance and anti-interference capability of the differential lock device.

[0050] It should be noted that the various embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles, practical applications, or technical improvements to the market of the various embodiments, or to enable other persons skilled in the art to understand the various embodiments disclosed herein.

Claims

1. A differential lock device, characterized in that: The device comprises: A voltage conversion module (100), a current sampling module (200), a voltage comparison module (300), a protection module (400), and a sampling resistor (500); The voltage conversion module (100) is electrically connected to the voltage comparison module (300), and the voltage conversion module (100) is used to provide a reference voltage value for the voltage comparison module (300); The current sampling module (200) is connected in parallel with the sampling resistor (500) and is electrically connected to the voltage comparison module (300); the current sampling module (200) is used to obtain a sampled voltage value corresponding to the sampling resistor (500) and send the sampled voltage value to the voltage comparison module (300); The voltage comparison module (300) is electrically connected to the protection module (400), and the voltage comparison module (300) is used to receive the reference voltage value and the sampled voltage value, and control the protection module (400) to open or close.

2. A differential lock device according to claim 1, characterized in that: The voltage comparison module (300) is used to compare the reference voltage value and the sampled voltage value, and provide an overcurrent protection signal to the protection module (400).

3. The differential lock device according to claim 1, characterized in that: The sampling resistor (500) is connected to a main power supply (2), and the main power supply (2) is used to provide a supply voltage value; The reference voltage value is half of the supply voltage value.

4. A differential lock device according to claim 3, characterized in that The protection module (400) is connected in series with the main power supply (2) and the vehicle load (3), so that the protection module (400) controls the connection between the vehicle load (3) and the main power supply (2) to be opened or closed.

5. The differential lock device according to claim 1, characterized in that: The current sampling module (200) comprises a sampling unit and a processing unit; The sampling unit is used to sample the voltage across the sampling resistor (500) to obtain the sampled voltage value; The processing unit is used to perform voltage amplification processing on the sampled voltage value, and send the sampled voltage value after the amplification processing to the voltage comparison module (300).

6. The differential lock device according to claim 1, characterized in that: The resistance value of the sampling resistor (500) is set between 0.01 mΩ and 100 mΩ.

7. The differential lock device according to claim 6, characterized in that: The resistance value of the sampling resistor (500) is set to 1 mΩ.

8. The differential lock device according to claim 1, characterized in that: The protection module (400) is a metal oxide semiconductor field effect transistor; The metal oxide semiconductor field effect transistor comprises a gate terminal, a source terminal and a drain terminal; the gate terminal is coupled to the voltage comparison module (300) to receive an overcurrent protection signal, and determines the conductor between the source terminal and the drain terminal and the shutdown according to the overcurrent protection signal output by the voltage comparison module (300).

9. A vehicle, characterized in that: The vehicle comprises a differential lock device (1) according to any one of claims 1 to 8; The vehicle comprises at least two wheels, and the differential lock device (1) is arranged between the opposing wheels.

10. A vehicle according to claim 9, characterized in that: The vehicle includes a front axle differential (5) and a rear axle differential (6); The number of the differential lock devices (1) is configured to be at least two; the front axle differential (5) and the rear axle differential (6) each correspond to at least one differential lock device (1).

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