Protection method, device and circuit for disconnecting device drive coil

Abstract

The present invention discloses a protection method, device and circuit for a disconnect device drive coil. The method comprises: outputting an original frequency signal to the disconnect device drive coil through a coil control output terminal, wherein the disconnect device drive coil is connected to a power supply via a switch, and the power supply is used to power the disconnect device drive coil; performing signal recovery on the original frequency signal through the coil control output terminal to obtain a recovery signal; determining whether a short circuit to ground occurs in the disconnect device drive coil based on the recovery signal; and disconnecting the connection between the disconnect device drive coil and the power supply through a switch in the event that a short circuit to ground occurs in the disconnect device drive coil in the related art. The present invention solves the problem that the stability of the disconnect device drive coil cannot be ensured in the event that a short circuit to ground occurs in the disconnect device drive coil.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control, and in particular to a protection method, device and circuit for a driving coil of a disconnecting device. Background Art

[0002] The disconnect device is used to control the vehicle's driving mode. Specifically, the current in the disconnect device's drive coil is controlled to control whether the disconnect device is engaged or not, thereby enabling the vehicle to switch between four-wheel drive and two-wheel drive modes.

[0003] In the related art, one end of the disconnect device drive coil is connected to the positive pole of the power supply and the other end is connected to the output of a control unit. The control unit then outputs a control signal to control the current in the disconnect device drive coil. This method has the following drawbacks: if the disconnect device drive coil shorts to ground, the two ends of the disconnect device drive coil are directly connected to the positive and negative poles of the power supply. The continuous high current flowing through the disconnect device drive coil generates a large amount of heat, which can damage the disconnect device drive coil. In the related art, if the disconnect device drive coil shorts to ground, there is a problem with ensuring the stability of the disconnect device drive coil.

[0004] To address the above-mentioned problems, no effective solutions have been proposed so far. Summary of the Invention

[0005] An embodiment of the present invention provides a method, device and circuit for protecting a disconnect device drive coil, so as to at least solve the technical problem in related technologies that the stability of the disconnect device drive coil cannot be ensured when a short circuit to ground occurs in the disconnect device drive coil.

[0006] According to one aspect of an embodiment of the present invention, a protection method for a disconnecting device drive coil is provided, comprising: outputting an original frequency signal to the disconnecting device drive coil through a coil control output terminal, wherein the disconnecting device drive coil is connected to a power supply via a switch, and the power supply is used to power the disconnecting device drive coil; performing signal recovery on the original frequency signal through the coil control output terminal to obtain a recovery signal; determining whether a short-circuit fault to ground occurs in the disconnecting device drive coil based on the recovery signal; and disconnecting the connection between the device drive coil and the power supply through the switch in the event that a short-circuit fault to ground occurs in the disconnecting device drive coil.

[0007] Optionally, determining whether a short circuit fault occurs to the ground in the driving coil of the disconnecting device based on the recovery signal includes: determining that a short circuit fault occurs to the ground in the driving coil of the disconnecting device when the recovery signal is a continuous low-level signal.

[0008] Optionally, when a short-circuit fault occurs to the ground in the disconnecting device driving coil, disconnecting the connection between the device driving coil and the power supply by the switch includes: when a short-circuit fault occurs to the ground in the disconnecting device driving coil, generating a disconnection instruction for controlling the disconnection of the switch; and controlling the disconnection of the switch according to the disconnection instruction.

[0009] Optionally, the original frequency signal is a pulse width modulation signal.

[0010] According to another aspect of an embodiment of the present invention, a protection device for a disconnecting device drive coil is provided, including: an output module, configured to output an original frequency signal to the disconnecting device drive coil through a coil control output terminal, wherein the disconnecting device drive coil is connected to a power supply via a switch, and the power supply is configured to supply power to the disconnecting device drive coil; a control module, configured to perform signal recovery on the original frequency signal through the coil control output terminal to obtain a recovery signal, and determine whether a short-circuit fault to ground occurs in the disconnecting device drive coil based on the recovery signal; and in the event that a short-circuit fault to ground occurs in the disconnecting device drive coil, disconnecting the connection between the device drive coil and the power supply through the switch.

[0011] Optionally, the control module includes: a ground short circuit fault judgment unit, which is used to determine that a ground short circuit fault occurs in the driving coil of the disconnecting device when the recovery signal is a continuous low-level signal.

[0012] According to another aspect of an embodiment of the present invention, a disconnecting device drive coil circuit is further provided, comprising: a control unit, a disconnecting device drive coil, a switch, and a power supply; the coil control output end of the control unit is connected to one end of the disconnecting device drive coil, the other end of the disconnecting device drive coil is connected to one end of the switch, the other end of the switch is connected to the power supply, and the switch control instruction output end of the control unit is connected to the control end of the switch; wherein the control unit outputs an original frequency signal through the coil control output end, and retrieves a feedback signal from the coil control output end, determines whether a short-circuit fault to ground occurs in the disconnecting device drive coil based on the feedback signal, and disconnects the connection between the device drive coil and the power supply through the switch when a short-circuit fault to ground occurs in the disconnecting device drive coil.

[0013] Optionally, the control unit includes: a microcontroller, a first MOS transistor, a first resistor, and a second MOS transistor; a frequency signal output terminal of the microcontroller is connected to the gate of the first MOS transistor, the source of the first MOS transistor is grounded, the drain of the first MOS transistor is connected to one end of the first resistor, and the connection point constitutes a coil control output terminal of the control unit; the other end of the first resistor is connected to a feedback signal receiving terminal of the microcontroller; a switch control instruction output terminal of the microcontroller is connected to the gate of the second MOS transistor, the source of the second MOS transistor is grounded, and the drain of the second MOS transistor constitutes the switch control instruction output terminal of the control unit.

[0014] Optionally, the switch comprises a relay.

[0015] According to another aspect of an embodiment of the present invention, a vehicle is further provided, comprising a disconnect device drive coil circuit as described above, wherein the disconnect device drive coil circuit is arranged in a disconnect device, and the disconnect device is used to control the target vehicle to switch between a two-wheel drive mode and a four-wheel drive mode.

[0016] In an embodiment of the present invention, an original frequency signal is output to the disconnecting device driving coil through the coil control output end, wherein the disconnecting device driving coil is connected to a power supply via a switch, and the power supply is used to power the disconnecting device driving coil; the original frequency signal is sampled through the coil control output end to obtain a sampled signal; based on the sampled signal, it is determined whether the disconnecting device driving coil has a short-circuit fault to the ground; in the event that the disconnecting device driving coil has a short-circuit fault to the ground, the connection between the device driving coil and the power supply is disconnected through the switch, thereby solving the technical problem in the related art that the stability of the disconnecting device driving coil cannot be ensured in the event that the disconnecting device driving coil has a short-circuit fault to the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of an optional method for protecting a driving coil of a disconnecting device according to an embodiment of the present invention;

[0019] Figure 2 is a structural block diagram of an optional protection device for disconnecting a drive coil according to an embodiment of the present invention;

[0020] Figure 3 is a flow chart of another optional method for protecting a driving coil of a disconnecting device according to an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of an optional disconnect device drive coil circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the description 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 numbers used in this way can be interchanged 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 device 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.

[0024] According to an embodiment of the present invention, an embodiment of a protection method for disconnecting a device driving coil is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0025] Figure 1 4 is a flow chart of an optional method for protecting a driving coil of a disconnecting device according to an embodiment of the present invention.

[0026] Reference Figure 1 As shown, the method includes the following steps:

[0027] Step S102: Outputting the original frequency signal to the disconnecting device driving coil via the coil control output terminal, wherein the disconnecting device driving coil is connected to a power supply via a switch, and the power supply is used to supply power to the disconnecting device driving coil;

[0028] Step S104, performing signal recovery on the original frequency signal through the coil control output end to obtain a recovery signal;

[0029] Step S106, determining whether a short circuit to ground occurs in the driving coil of the disconnecting device according to the recovery signal;

[0030] Step S108 : when a short circuit fault occurs to the ground in the driving coil of the disconnecting device, disconnect the connection between the driving coil of the disconnecting device and the power supply through a switch.

[0031] In an embodiment of the present invention, an original frequency signal is output to the disconnecting device driving coil through the coil control output end, wherein the disconnecting device driving coil is connected to a power supply via a switch, and the power supply is used to power the disconnecting device driving coil; the original frequency signal is sampled through the coil control output end to obtain a sampled signal; based on the sampled signal, it is determined whether a short-circuit fault to the ground occurs in the disconnecting device driving coil; in the event that a short-circuit fault to the ground occurs in the disconnecting device driving coil, the connection between the disconnecting device driving coil and the power supply is disconnected through the switch, thereby solving the technical problem in the related art that the stability of the disconnecting device driving coil cannot be ensured in the event that a short-circuit fault to the ground occurs in the disconnecting device driving coil.

[0032] Optionally, determining whether a short circuit fault occurs to the ground in the drive coil of the disconnecting device according to the recovery signal includes: determining that a short circuit fault occurs to the ground in the drive coil of the disconnecting device when the recovery signal is a continuous low-level signal.

[0033] Optionally, in the event that a short circuit occurs to the ground in the disconnecting device driving coil, the connection between the disconnecting device driving coil and the power supply is disconnected by a switch, including: generating a disconnection instruction for controlling the disconnection of the switch when a short circuit occurs to the ground in the disconnecting device driving coil; and controlling the disconnection of the switch according to the disconnection instruction.

[0034] Optionally, the original frequency signal is a pulse width modulation signal.

[0035] Figure 2 1 is a structural block diagram of an optional disconnect device driving coil protection device according to an embodiment of the present invention. Figure 2 As shown, the device includes an output module 202, a control module 204, a switch 206, a disconnect device drive coil 208 and a power supply 210;

[0036] The output module 202 is used to output the original frequency signal to the coil control output end, wherein the coil control output end is connected to one end of the disconnecting device drive coil 208, and the other end of the disconnecting device drive coil 208 is connected to the power supply 210 via a switch, and the power supply 210 is used to supply power to the disconnecting device drive coil 208; the control module 204 is used to collect a feedback signal generated according to the original frequency signal, and determine whether the disconnecting device drive coil 208 has a short circuit to ground fault based on the feedback signal. In the event that the disconnecting device drive coil 208 has a short circuit to ground fault, the connection between the device drive coil and the power supply 210 is disconnected through the switch 206.

[0037] In some optional embodiments, the control module 204 includes: a ground short circuit fault judgment unit, configured to determine that a ground short circuit fault occurs in the driving coil of the disconnecting device when the feedback signal is a continuous low level signal.

[0038] In some optional embodiments, the disconnect device drive coil circuit includes: a control unit, a disconnect device drive coil, a switch, and a power supply; wherein the coil control output end of the control unit is connected to one end of the disconnect device drive coil, the other end of the disconnect device drive coil is connected to one end of the switch, the other end of the switch is connected to the power supply, and the switch control instruction output end of the control unit is connected to the control end of the switch; wherein the control unit outputs the original frequency signal through the coil control output end, and collects the feedback signal of the coil control output end, determines whether the disconnect device drive coil has a short circuit to ground fault based on the feedback signal, and in the event that the disconnect device drive coil has a short circuit to ground fault, disconnects the connection between the device drive coil and the power supply through the switch.

[0039] In some optional embodiments, the control unit includes: a microcontroller, a first MOS transistor, a first resistor, and a second MOS transistor; the frequency signal output end of the microcontroller is connected to the gate of the first MOS transistor, the source of the first MOS transistor is grounded, the drain of the first MOS transistor is connected to one end of the first resistor, and the connection point constitutes the coil control output end of the control unit, and the other end of the first resistor is connected to the feedback signal receiving end of the microcontroller; the switch control instruction output end of the microcontroller is connected to the gate of the second MOS transistor, the source of the second MOS transistor is grounded, and the drain of the second MOS transistor constitutes the switch control instruction output end of the control unit.

[0040] Optionally, the switch comprises a relay.

[0041] Based on the above embodiment and optional embodiment, the present invention provides an optional implementation of a protection method and circuit for a driving coil of a disconnecting device.

[0042] It should be understood that the disconnect device is used to control the driving mode of the car. The disconnect device is controlled by controlling the current of the disconnect device coil to control whether the disconnect device is engaged, thereby realizing the switching between four-wheel drive and two-wheel drive modes. The control method is usually to directly connect one end of the coil to the positive pole of the battery and the other end to the coil control output end of the electronic control unit. This method has a simple structure, but during application, when a short-circuit fault occurs at the coil control output end, the two ends of the coil are directly connected to the positive and negative poles of the power supply. The continuous large current passing through the coil will generate a lot of heat, which can easily lead to thermal failure and damage the drive coil. And when there is a continuous large current passing through the coil, the disconnect device is always in the engaged state and cannot exit the four-wheel drive mode. In the related art, in the event of a short-circuit fault to the ground in the disconnect device drive coil, there is a technical problem that the stability of the disconnect device drive coil cannot be ensured.

[0043] In view of this, this optional embodiment provides an optional embodiment for solving the technical problem in the related art that the stability of the disconnect device drive coil cannot be ensured when a short circuit fault occurs to the ground in the disconnect device drive coil.

[0044] The protection method of the driving coil of the disconnecting device is described in detail below. Figure 3 is a flow chart of another optional protection method for disconnecting a drive coil according to an embodiment of the present invention. Figure 4 Schematic diagram of an optional disconnect device drive coil circuit according to an embodiment of the present invention.

[0045] Reference Figure 3 and Figure 4 , a protection method for disconnecting the drive coil of the device is described. The method includes the following steps:

[0046] Step S302: Enabling coil drive: The electronic control unit (ECU) activates the relay via the relay control output, allowing power to be supplied to the disconnect device drive coil. The coil control output outputs a pulse-width modulated signal, providing a drive control signal for the disconnect device drive coil. This coil drive control signal is used to control the current in the disconnect device drive coil.

[0047] Step S304: Diagnose control terminal faults: The electronic control unit retrieves the coil control output terminal signal in real time. When the disconnect device is operating normally, the retrieved signal is the same as the coil control output terminal signal, both being pulse-width modulated signals. In the event of a short-to-ground fault, the retrieved signal differs from the coil control output terminal signal and is a continuously low-level signal.

[0048] Step S306, cutting off the coil power supply: When a short circuit occurs to the ground in the disconnect device drive coil, the electronic control unit generates a relay control instruction through the relay control output terminal, and controls the relay to disconnect according to the relay control instruction, thereby cutting off the connection between the disconnect device drive coil and the power supply, preventing the disconnect device from being damaged due to thermal failure of the coil.

[0049] Continue to refer to Figure 4 The circuit of the disconnect device drive coil is described below. The disconnect device drive coil circuit includes an electronic control unit, a disconnect device drive coil, a relay, and a battery.

[0050] The electronic control unit includes a microcontroller, a first resistor R1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first MOS transistor Q1, and a second MOS transistor Q2.

[0051] The frequency signal output terminal of the microcontroller ( Figure 4 The pre-driver 1) is connected to the gate of the first MOS transistor Q1, the source of the first MOS transistor Q1 is connected to one end of the first capacitor C1 and is grounded, the drain of the first MOS transistor Q1 is connected to the first end of the first resistor R1 and the other end of the first capacitor C1, and the connection points constitute the coil control output end of the electronic control unit, and the coil control output end of the electronic control unit is connected to the first end of the disconnect device drive coil; the second end of the first resistor R1 is connected to one end of the third capacitor C3 and the frequency input end of the microcontroller, and the other end of the third capacitor C3 is grounded; the second end of the disconnect device drive coil is connected to the first end of the relay, the second end of the relay is connected to the positive electrode of the battery, and the negative electrode of the battery is grounded.

[0052] The switch control command output terminal of the microcontroller ( Figure 4 The pre-driver 2) is connected to the gate of the second MOS tube, the source of the second MOS tube is connected to one end of the second capacitor C2 and is grounded, the drain of the second MOS tube is connected to the other end of the second capacitor, and the connection point constitutes the relay control output end of the electronic control unit, and the relay control output end of the electronic control unit is connected to the control end of the relay.

[0053] It should be noted that the frequency signal output terminal is used to output a pulse width modulation signal, and the switch control instruction output terminal is used to output a shutdown instruction for controlling the switch to turn off or a conduction instruction for controlling the switch to turn on.

[0054] According to another aspect of an embodiment of the present invention, a vehicle is also provided, comprising a disconnect device drive coil circuit according to any one of the above items, wherein the disconnect device drive coil circuit is arranged in a disconnect device, and the disconnect device is used to control the target vehicle to switch between a two-wheel drive mode and a four-wheel drive mode.

[0055] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some terminals, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0057] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0058] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0059] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A protection method for a disconnect device driving coil, characterized in that: include: Outputting the original frequency signal to the disconnecting device driving coil through the coil control output terminal, wherein the disconnecting device driving coil is connected to a power supply via a switch, and the power supply is used to supply power to the disconnecting device driving coil; Performing signal recovery on the original frequency signal through the coil control output end to obtain a recovery signal; determining, based on the recovery signal, whether a short circuit to ground occurs in the driving coil of the disconnecting device; In the event that a short circuit occurs to the ground in the disconnect device driving coil, disconnecting the connection between the device driving coil and the power supply by means of the switch; The coil control output end is formed by a connection point where the drain of the first MOS tube in the control unit is connected to one end of the first resistor in the control unit, and the control unit also includes the coil control output end.

2. The method according to claim 1, characterized in that The step of determining whether a short circuit to ground occurs in the driving coil of the disconnecting device according to the recovery signal includes: When the recovery signal is a continuous low-level signal, it is determined that a short circuit fault occurs to the ground in the driving coil of the disconnecting device.

3. The method according to claim 1, characterized in that When a short circuit fault occurs to the ground in the disconnecting device driving coil, disconnecting the connection between the device driving coil and the power supply by the switch comprises: When a short circuit to ground occurs in the driving coil of the disconnecting device, generating a disconnection instruction for controlling the disconnection of the switch; The switch is controlled to be disconnected according to the disconnection instruction.

4. The method according to claim 1, wherein The original frequency signal is a pulse width modulation signal.

5. A protection device for a disconnect device driving coil, characterized in that: include: an output module, configured to output an original frequency signal to a disconnecting device drive coil via a coil control output terminal, wherein the disconnecting device drive coil is connected to a power supply via a switch, and the power supply is configured to supply power to the disconnecting device drive coil; a control module, configured to perform signal recovery on the original frequency signal through the coil control output end to obtain a recovery signal, determine whether a short-circuit fault to ground occurs in the disconnecting device drive coil based on the recovery signal, and disconnect the device drive coil from the power supply through the switch if a short-circuit fault to ground occurs in the disconnecting device drive coil; The coil control output end is formed by a connection point where the drain of the first MOS tube in the control unit is connected to one end of the first resistor in the control unit, and the control unit also includes the coil control output end.

6. The device according to claim 5, characterized in that The control module includes: The ground short circuit fault judgment unit is used to determine that the disconnect device drive coil has a ground short circuit fault when the recovery signal is a continuous low-level signal.

7. A disconnect device driving coil circuit, characterized in that: include: Control unit, disconnect device drive coil, switch, power supply; The coil control output terminal of the control unit is connected to one end of the disconnect device drive coil, the other end of the disconnect device drive coil is connected to one end of the switch, the other end of the switch is connected to the power supply, and the switch control instruction output terminal of the control unit is connected to the control end of the switch; The control unit outputs the original frequency signal through the coil control output terminal, and collects the feedback signal of the coil control output terminal, and determines whether the disconnecting device drive coil has a short-circuit fault to ground according to the feedback signal. In the event that the disconnecting device drive coil has a short-circuit fault to ground, the switch disconnects the device drive coil from the power supply. The control unit includes a first MOS transistor and a first resistor, and the coil control output end is formed by a connection point where the drain of the first MOS transistor and one end of the first resistor are connected.

8. The circuit according to claim 7, characterized in that The control unit further includes: a microcontroller and a second MOS tube; The frequency signal output end of the microcontroller is connected to the gate of the first MOS transistor, the source of the first MOS transistor is grounded, and the other end of the first resistor is connected to the feedback signal receiving end of the microcontroller; the switch control instruction output end of the microcontroller is connected to the gate of the second MOS transistor, the source of the second MOS transistor is grounded, and the drain of the second MOS transistor constitutes the switch control instruction output end of the control unit.

9. The circuit according to claim 7 or 8, characterized in that The switch includes a relay.

10. A vehicle, characterized in that: The disconnect device drive coil circuit according to claim 8 or 9 is provided in a disconnect device for controlling the target vehicle to switch between a two-wheel drive mode and a four-wheel drive mode.

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