Method and device for adjusting voltage of engine shaft and related equipment

Abstract

The invention provides an engine shaft voltage adjusting method and device and related equipment, and relates to the technical field of engines, the scheme is that whether the bottom of a carbon brush needs to be controlled to make contact with a flywheel of an engine or not is judged by detecting the magnitude of shaft voltage, and when the shaft voltage is larger than wanton preset voltage, the bottom of the carbon brush is controlled to make contact with the flywheel of the engine; the shaft voltage on the engine is discharged through the carbon brush, and when the separation condition is met, the bottom of the carbon brush is controlled to be separated from the flywheel of the engine, so that the carbon brush does not need to be in real-time contact with the flywheel, the contact time of the carbon brush and the flywheel is shortened, the abrasion speed of the carbon brush is reduced, and the service life of the carbon brush is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular, to a method and device for regulating the shaft voltage of an engine and related equipment. Background Art

[0002] Shaft voltage: When a motor is running, a certain degree of electric potential is generated between some components of the rotor, and this electric potential is called shaft voltage.

[0003] Shaft voltage is usually caused by factors such as asymmetric magnetic fields inside the motor, rotor eccentricity, and poor bearing insulation. When the motor is running, especially in large or high-speed motors, the shaft voltage may be relatively high, and its long-term existence may damage the bearings or cause lubrication failure.

[0004] Currently, the common protection method is indeed to use Figure 1 the carbon brush grounding shown in the figure. The voltage on the shaft is conducted away through the carbon brush to prevent charge accumulation. However, the carbon brush contacts the rotating part, and there is a wear problem. Especially at high speeds, the carbon brush wears faster and needs to be replaced frequently, increasing the maintenance cost. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a method and device for regulating the shaft voltage of an engine and related equipment to improve the service life of the carbon brush.

[0006] To achieve the above object, embodiments of the present invention provide the following technical solutions:

[0007] A method for regulating the shaft voltage of an engine includes:

[0008] Obtaining the shaft voltage of the engine;

[0009] Judging whether the shaft voltage is greater than a first preset voltage;

[0010] When the shaft voltage is greater than the first preset voltage, controlling the bottom of the carbon brush to contact the flywheel of the engine;

[0011] When the carbon brush separation condition is satisfied, controlling the bottom of the carbon brush to separate from the flywheel of the engine.

[0012] Optionally, in the method for regulating the shaft voltage of the engine, the controlling the bottom of the carbon brush to separate from the flywheel of the engine when the carbon brush separation condition is satisfied includes:

[0013] Obtaining the grounding current of the carbon brush;

[0014] Judging whether the grounding current is less than a first preset current;

[0015] When the grounding current is less than the first preset current, controlling the bottom of the carbon brush to separate from the flywheel of the engine.

[0016] Optionally, for the engine shaft voltage regulation method, when the carbon brush separation condition is satisfied, controlling the bottom of the carbon brush to be separated from the flywheel of the engine includes:

[0017] When the shaft voltage is not greater than the second preset voltage, controlling the bottom of the carbon brush to be separated from the flywheel of the engine.

[0018] Optionally, the engine shaft voltage regulation method further includes:

[0019] When the shaft voltage is less than the first preset voltage, keeping the current state of the bottom of the carbon brush unchanged;

[0020] When the grounding current is not less than the first preset current, keeping the current state of the bottom of the carbon brush unchanged.

[0021] Optionally, for the engine shaft voltage regulation method, controlling the bottom of the carbon brush to contact the flywheel of the engine includes:

[0022] Disconnecting the connection between the electromagnet and the excitation power supply so that the bottom of the carbon brush contacts the flywheel of the engine;

[0023] Wherein, the excitation power supply is used to supply power to the electromagnet, the electromagnet faces the magnetic metal block, and the magnetic metal block is rigidly connected to the spring in the carbon brush;

[0024] Controlling the bottom of the carbon brush to be separated from the flywheel of the engine includes:

[0025] Controlling the path between the electromagnet and the excitation power supply so that the bottom of the carbon brush is separated from the flywheel of the engine.

[0026] An engine shaft voltage regulation device includes:

[0027] An engine shaft voltage detector for obtaining the shaft voltage of the engine;

[0028] A controller for determining whether the shaft voltage is greater than the first preset voltage. When the shaft voltage is greater than the first preset voltage, controlling the bottom of the carbon brush to contact the flywheel of the engine; when the carbon brush separation condition is satisfied, controlling the bottom of the carbon brush to be separated from the flywheel of the engine.

[0029] Optionally, the engine shaft voltage regulation device of Sohu further includes:

[0030] An excitation power supply;

[0031] An electromagnet connected to the excitation power supply through a changeover switch;

[0032] When the controller controls the bottom of the carbon brush to contact the flywheel of the engine, it is specifically used for: controlling the switching switch to disconnect, disconnecting the connection between the electromagnet and the excitation power supply, so that the bottom of the carbon brush contacts the flywheel of the engine;

[0033] When the controller controls the bottom of the carbon brush to separate from the flywheel of the engine, it is specifically used for: controlling the switching switch to conduct, so that the electromagnet and the excitation power supply are conducted, so that the bottom of the carbon brush separates from the flywheel of the engine.

[0034] Wherein, the electromagnet faces the magnetic metal block, and the magnetic metal block is rigidly connected to the spring in the carbon brush.

[0035] Optionally, in the engine shaft voltage regulating device, the engine shaft voltage detector is an isolated voltage probe.

[0036] A carbon brush includes a carbon brush body and any one of the above engine shaft voltage regulating devices.

[0037] An automobile, the above carbon brush.

[0038] Based on the above technical solutions, the above solutions provided in the embodiments of the present invention determine whether to control the bottom of the carbon brush to contact the flywheel of the engine by detecting the magnitude of the shaft voltage. When the shaft voltage is greater than any preset voltage, control the bottom of the carbon brush to contact the flywheel of the engine. At this time, the shaft voltage on the engine is discharged through the carbon brush. When the separation condition is met, control the bottom of the carbon brush to separate from the flywheel of the engine. Thus, in this solution, there is no need for the carbon brush to be in contact with the flywheel in real time, reducing the contact time between the carbon brush and the flywheel, reducing the wear speed of the carbon brush, and improving the service life of the carbon brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0040] Figure 1 It is a schematic flowchart of the engine shaft voltage regulating method disclosed in the embodiments of the present application;

[0041] Figure 2 It is a schematic flowchart of the engine shaft voltage regulating method disclosed in another embodiment of the present application;

[0042] Figure 3 It is a schematic structural diagram of the engine shaft voltage regulating device and the carbon brush disclosed in the embodiments of the present application;

[0043] Figure 4 Cross-sectional view of the carbon brush;

[0044] Figure 5 Schematic diagram of the voltage detection principle of the engine shaft voltage detector disclosed in the embodiment of the present application;

[0045] Figure 6 Schematic diagram of the structure of the amplifier disclosed in the embodiment of the present application. Detailed implementation manners

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0047] The present invention monitors the shaft voltage and the grounding line current of the engine in real time. When the shaft voltage reaches the set limit value, the carbon brush is released to achieve grounding, so as to protect the engine; when the grounding current drops to the set limit value, the carbon brush is retracted to reduce the wear of the carbon brush. Compared with the traditional protection device, the present invention can detect, execute and reset in real time, realize a closed loop, greatly extend the service life of the carbon brush, and reduce the use cost. The structure is simple and reliable, and the processing and assembly are convenient.

[0048] See Figure 1 , the engine shaft voltage regulation method disclosed in the embodiment of the present application may include:

[0049] Step S101: Obtain the shaft voltage of the engine.

[0050] The shaft voltage refers to the voltage induced on the engine shaft due to reasons such as asymmetric engine magnetic field and static charging. It is a common electrical phenomenon during the operation of the engine, especially more significant in large and high-speed engines. The causes of shaft voltage generation include magnetic circuit asymmetry, capacitive coupling effects of the motor rectification and inversion systems, electrostatic effects, and axial magnetic flux and residual magnetism. In this solution, the shaft voltage of the engine can be detected by relevant voltage detection devices. Preferably, in the present application, the shaft voltage of the engine can be measured in a non-contact manner to prevent wear of the voltage detection equipment.

[0051] Step S102: Determine whether the shaft voltage is greater than a first preset voltage.

[0052] In this application, a first preset voltage is set in advance. When the shaft voltage is greater than the first preset voltage, it indicates that the shaft voltage is relatively high. At this time, the presence of the shaft voltage may damage the bearing or cause lubrication failure, and the shaft voltage needs to be discharged. If the shaft voltage is not greater than the first preset voltage, the shaft voltage has no impact on the engine and there is no need to discharge the shaft voltage. Therefore, in this solution, after obtaining the shaft voltage, it is necessary to determine whether the shaft voltage is greater than the first preset voltage, and based on the comparison result between the shaft voltage and the first preset voltage, determine whether to control the bottom of the carbon brush to contact the flywheel of the engine.

[0053] Step S103: When the shaft voltage is greater than the first preset voltage, control the bottom of the carbon brush to contact the flywheel of the engine.

[0054] In this application, a position adjustment mechanism is pre-configured for the carbon brush. This mechanism is used to adjust the position of the bottom of the carbon brush. By adjusting the position of the bottom of the carbon brush, it is possible to control the bottom of the carbon brush to contact or separate from the flywheel of the engine. When the bottom of the carbon brush contacts the flywheel of the engine under the control of the position adjustment mechanism, the shaft voltage of the engine will be discharged to the ground through the grounding wire on the carbon brush, thereby reducing the shaft voltage of the engine.

[0055] Step S104: When the carbon brush separation condition is met, control the bottom of the carbon brush to separate from the flywheel of the engine.

[0056] In this step, the situation of the shaft voltage is detected based on the pre-collected engine parameters. Based on the situation of the shaft voltage, it is determined whether the shaft voltage needs to be discharged. If the shaft voltage does not need to be discharged, it indicates that the preset carbon brush separation condition is met. When the carbon brush separation condition is met, it is necessary to control the bottom of the carbon brush to separate from the flywheel of the engine. If the carbon brush separation condition is not met, it is necessary to continue to keep the bottom of the carbon brush in contact with the flywheel of the engine to continue discharging the shaft voltage.

[0057] In this embodiment, the magnitude of the shaft voltage is detected to determine whether the shaft voltage is greater than the first preset voltage. When it is greater than the first preset voltage, it indicates that the shaft voltage needs to be discharged. At this time, it is necessary to control the bottom of the carbon brush to contact the flywheel of the engine. After the bottom of the carbon brush contacts the flywheel of the engine, the shaft voltage on the engine is discharged through the carbon brush. When the separation condition of the bottom of the carbon brush and the flywheel is met, the position adjustment mechanism is controlled to control the bottom of the carbon brush to separate from the flywheel of the engine. Thus, in this solution, there is no need for the carbon brush to be in contact with the rotating part (flywheel) in real time, reducing the contact time between the carbon brush and the rotating part, reducing the wear speed of the carbon brush, and improving the service life of the carbon brush.

[0058] In the technical solution disclosed in this embodiment, it is possible to determine whether it is necessary to control the separation of the carbon brush from the flywheel based on the pre-configured carbon brush separation condition. In an embodiment of the present application,

[0059] a preset carbon brush separation condition can be configured in advance. The content of the carbon brush separation condition can be set according to user needs. When the carbon brush separation condition is satisfied, it indicates that there is no need to discharge the shaft voltage. In this embodiment, relevant parameters of the carbon brush separation condition are obtained in real time, and it is judged whether these relevant parameters satisfy the carbon brush separation condition. When the carbon brush separation condition is satisfied, there is no need for the carbon brush to contact the flywheel of the engine, and it is necessary to control the separation of the bottom of the carbon brush from the flywheel of the engine.

[0060] In this embodiment, the carbon brush separation condition may be: the shaft voltage is less than a second preset voltage, and the second preset voltage is less than the first preset voltage. Thus, it is only necessary to detect the shaft voltage to control the contact and separation of the carbon brush and the flywheel. In addition, by setting the second preset voltage to be less than the first preset voltage, the situation where the carbon brush repeatedly contacts and separates from the flywheel at high frequency can be prevented. At this time, "when the carbon brush separation condition is satisfied, control the separation of the bottom of the carbon brush from the flywheel of the engine" in the foregoing solution may specifically include: after the bottom of the carbon brush contacts the flywheel, continue to detect the shaft voltage, and judge whether the shaft voltage is less than the second preset voltage. When the shaft voltage is less than the second preset voltage, control the separation of the bottom of the carbon brush from the flywheel of the engine. When the shaft voltage is not less than the second preset voltage, continue to detect the shaft voltage.

[0061] In this embodiment, the carbon brush separation condition may be: the grounding current of the carbon brush is less than a first preset current. The shaft voltage can be discharged to the ground through the carbon brush. The smaller the grounding current of the carbon brush, the smaller the shaft voltage indicates. Therefore, in this embodiment, it is also possible to judge whether it is necessary to control the separation of the bottom of the carbon brush from the flywheel by judging the magnitude of the grounding current of the carbon brush. Specifically, see Figure 2 ,"when the carbon brush separation condition is satisfied, control the separation of the bottom of the carbon brush from the flywheel of the engine", including:

[0062] Step S201: Obtain the grounding current of the carbon brush.

[0063] In this embodiment, when the bottom of the carbon brush comes into contact with the flywheel of the engine, the shaft voltage will be discharged to the ground through the grounding wire of the carbon brush. By detecting the current in the grounding wire of the carbon brush, this current is the grounding current of the carbon brush. When the bottom of the carbon brush is not in contact with the flywheel of the engine, no current flows through the grounding wire of the carbon brush. At this time, the grounding current of the carbon brush is 0. When the bottom of the carbon brush comes into contact with the flywheel of the engine, there is a voltage difference between the engine and the ground. The magnitude of this voltage difference is the shaft voltage. The charge on the engine will enter the ground through the grounding wire of the carbon brush. At this time, there is current flowing through the grounding wire of the carbon brush, and the grounding current value is greater than zero. Moreover, the greater the shaft voltage, the greater the grounding current. Similarly, the smaller the grounding current, the smaller the shaft voltage. At this time, by detecting the magnitude of the grounding current, the magnitude of the shaft voltage can be judged, and then it can be judged whether it is necessary to maintain the contact state between the carbon brush and the flywheel.

[0064] Step S202: Determine whether the grounding current is less than a first preset current.

[0065] In this embodiment, a first preset current is preconfigured. Theoretically speaking, when the grounding current of the carbon brush is the first preset current, the shaft voltage is the second preset voltage. When the grounding current is less than the first preset current, it is equivalent to the shaft voltage being less than the second preset voltage. At this time, the separation between the bottom of the carbon brush and the flywheel can be controlled.

[0066] Step S203: When the grounding current is less than the first preset current, control the bottom of the carbon brush to separate from the flywheel of the engine.

[0067] In the technical solution disclosed in this embodiment, in order to accurately control the separation between the bottom of the carbon brush and the flywheel of the engine, in this embodiment, the preset conditions may include: Condition 1, whether the grounding current is less than the first preset current; Condition 2, the shaft voltage is not greater than the second preset voltage. As long as any one of Condition 1 and Condition 2 is satisfied, the separation between the bottom of the carbon brush and the flywheel of the engine can be controlled.

[0068] In this embodiment, if the magnitude of the grounding current is used as the judgment condition for whether the carbon brush and the flywheel can be separated from each other, when the shaft voltage detected after the bottom of the carbon brush comes into contact with the flywheel of the engine is not greater than the first preset voltage, it is also necessary to keep the current state of the bottom of the carbon brush unchanged (keep the bottom of the carbon brush in contact with the flywheel). When the grounding current is not less than the first preset current, it is also necessary to keep the current state of the bottom of the carbon brush unchanged (keep the bottom of the carbon brush in contact with the flywheel). Only when the grounding current is less than the first preset current, the separation between the bottom of the carbon brush and the flywheel of the engine is controlled.

[0069] In the technical solution disclosed in this embodiment, a transmission mechanism can be configured for the carbon brush, and the contact and separation between the bottom of the carbon brush and the flywheel can be controlled through the transmission mechanism. For example, the transmission mechanism can control the position of the bottom of the carbon brush.

[0070] In the technical solution disclosed in this embodiment, as Figure 3 shown, the carbon brush can maintain the existing installation method unchanged. In order to realize the free adjustment of the position of the bottom of the carbon brush (separation from the flywheel and contact with the flywheel), an opening can be opened on the side of the carbon brush, and a magnetic metal block 1 that can freely move in the opening is arranged in the opening. The first part of the magnetic metal block 1 passes through the opening and is exposed outside the carbon brush. The second part of the magnetic metal block 1 is fixedly connected to a spring 6 inside the carbon brush (see Figure 4 , a spring 6 is arranged inside the carbon brush, the bottom of the carbon brush is connected to the spring 6, and the spring 6 can push the bottom of the carbon brush to contact the flywheel). By moving the magnetic metal block 1, the compression and relaxation of the spring inside the carbon brush can be controlled. One end of the spring is connected to the bottom of the carbon brush, and the bottom of the carbon brush moves together with the spring. When the spring is compressed, the bottom of the carbon brush separates from the flywheel, and when the spring relaxes, the bottom of the carbon brush contacts the flywheel. An electromagnet 2 is arranged at a position facing the magnetic metal block 1. The excitation power supply 3 can supply power to the electromagnet 2 through a change-over switch 4. When the electromagnet 2 is energized, it generates magnetism. At this time, the electromagnet 2 generates a suction force on the magnetic metal block 1, causing the magnetic metal block 1 to approach the electromagnet 2. At this time, driven by the magnetic metal block 1, the spring 6 inside the carbon brush is compressed, causing the bottom of the carbon brush to separate from the flywheel. When the electromagnet 2 is de-energized, the electromagnet 2 loses magnetism, the suction force received by the magnetic metal block disappears, and the spring 6 inside the carbon brush resets. After the spring 6 resets, it pushes the bottom of the carbon brush to continue to contact the flywheel. Thus, in this solution, the control of the bottom of the carbon brush to contact the flywheel of the engine includes: disconnecting the connection between the electromagnet 2 and the excitation power supply 3 so that the bottom of the carbon brush contacts the flywheel of the engine; wherein, the excitation power supply 3 is used to supply power to the electromagnet 2, the electromagnet 2 faces the magnetic metal block 1, and the magnetic metal block 1 is rigidly connected to the spring 6 inside the carbon brush; the control of the bottom of the carbon brush to separate from the flywheel of the engine includes: controlling the connection between the electromagnet 2 and the excitation power supply 3 to be conductive so that the bottom of the carbon brush separates from the flywheel of the engine.

[0071] Corresponding to the above method for regulating the engine shaft voltage, an engine shaft voltage regulating device for implementing the above method is also disclosed in this embodiment. For the specific working content of each device in the device, please refer to the content of the above method embodiment.

[0072] The engine shaft voltage regulating device provided by the embodiments of the present invention will be described below. The engine shaft voltage regulating device described below can be correspondingly referred to the engine shaft voltage regulating method described above.

[0073] The device may include:

[0074] An engine shaft voltage detector 5 for obtaining the shaft voltage of the engine;

[0075] A controller for determining whether the shaft voltage is greater than a first preset voltage. When the shaft voltage is greater than the first preset voltage, controlling the bottom of the carbon brush to contact the flywheel of the engine; determining whether the grounding current is less than a first preset current. When the grounding current is less than the first preset current, controlling the bottom of the carbon brush to separate from the flywheel of the engine.

[0076] In this embodiment, the separation and contact between the bottom of the carbon brush and the flywheel can be controlled by driving the spring 6 in the carbon brush by the magnetic metal block 1. Refer to Figure 3 , the engine shaft voltage regulating device further includes:

[0077] An excitation power supply 3, and the excitation power supply 3 can be a 12V power supply or other types of power supplies;

[0078] An electromagnet 2, and the electromagnet 2 is connected to the excitation power supply 3 through a switching switch 4. Wherein, the switching switch 4 can be a transistor switch, and the transistor switch can be arranged in the transistor controller. The transistor controller is arranged between the electromagnet 2 and the excitation power supply 3. Whether the excitation power supply 3 supplies power to the electromagnet 2 can be controlled by the on-off state of the switching switch 4. When the electromagnet 2 is powered on, it generates a magnetic force to attract the magnetic metal block 1. When the electromagnet 2 is powered off, the magnetic force generated by it to attract the magnetic metal block 1 disappears, and the magnetic metal block 1 resets. In this solution, the electromagnet 2 is arranged at the bottom of the carbon brush body, and the electromagnet 2 is connected to the excitation power supply 3 through the switching switch 4.

[0079] When the controller controls the bottom of the carbon brush to contact the flywheel of the engine, it is specifically used for: controlling the switching switch 4 to be disconnected, disconnecting the connection between the electromagnet 2 and the excitation power supply 3, so that the bottom of the carbon brush contacts the flywheel of the engine;

[0080] When the controller controls the bottom of the carbon brush to separate from the flywheel of the engine, it is specifically used for: controlling the switching switch 4 to be turned on, so that the electromagnet 2 is connected to the excitation power supply 3, so that the bottom of the carbon brush separates from the flywheel of the engine.

[0081] Wherein, the electromagnet 2 faces the magnetic metal block 1, and the magnetic metal block 1 is rigidly connected to the spring 6 in the carbon brush.

[0082] In the above solution, the controller obtains the shaft voltage of the engine through the engine shaft voltage detector 5. After obtaining the shaft voltage, it determines whether the shaft voltage is greater than a first preset voltage. When it is greater than the first preset voltage, a first control signal is generated. The first control signal is used to control the disconnection of the changeover switch 4, so that the electromagnet 2 is powered off. After the electromagnet 2 is powered off, the magnetic metal block 1 loses the attraction of the electromagnet 2, and the positions of the magnetic metal block 1 and the spring 6 in the carbon brush connected to the magnetic metal block 1 are reset. At this time, the bottom of the carbon brush (the bottom of the carbon brush is connected to the end of the spring 6) contacts the flywheel. When the controller determines that the carbon brush separation condition is met, a second control signal is generated. The second control signal is used to control the closing of the changeover switch 4. After the changeover switch 4 is closed, the electromagnet 2 is powered on. After the electromagnet 2 is powered on, a magnetic field is generated. Under the action of the magnetic field, an attraction force is generated on the magnetic metal block 1. Under the action of the attraction force, the magnetic metal block 1 approaches the electromagnet 2. At this time, the spring 6 connected to the magnetic metal block 1 inside the carbon brush is compressed under the drive of the magnetic metal block 1. After the spring 6 is compressed, the bottom of the carbon brush is separated from the flywheel. After the bottom of the carbon brush is separated from the flywheel, it is no longer worn.

[0083] Corresponding to the above method, when the controller executes the action of "controlling the separation of the bottom of the carbon brush from the flywheel of the engine when the carbon brush separation condition is met", it can be specifically: obtaining the grounding current of the carbon brush; determining whether the grounding current is less than a first preset current; when the grounding current is less than the first preset current, controlling the separation of the bottom of the carbon brush from the flywheel of the engine.

[0084] Among them, the grounding current can be realized by a current sensor. The current sensor is used to detect the current on the grounding wire of the carbon brush. This current is recorded as the grounding current. The current sensor can specifically be a Hall sensor.

[0085] In this embodiment, the engine shaft voltage detector 5 is an isolated voltage probe, which detects the shaft voltage on the engine flywheel in an isolated manner to prevent wear on the engine shaft voltage detector 5 during the rotation of the flywheel. See Figure 5 , the isolated voltage probe 5 is fixed on the fixed seat 02. The isolated voltage probe 5 maintains a certain air gap from the flywheel 03 to achieve isolated measurement of the flywheel 03. The fixed seat 02 is fixed on the engine housing and is insulated from the engine housing. During the operation of the engine, according to Coulomb's law, when the electric field change of the flywheel is detected, the charge on the isolated voltage probe 5 also changes synchronously and generates a voltage signal (shaft voltage).

[0086] Further, in order to enable the controller to more accurately identify the shaft voltage and ground current, in this embodiment, an amplifier 04 may be provided. The amplifier includes a first amplifier and a second amplifier. The first amplifier is disposed between the engine shaft voltage detector 5 and the controller, and the second amplifier is disposed between the ground current detector and the controller. Refer to Figure 6 , the amplifier 04 is configured with a first amplifier and a second amplifier. The amplifier 04 has a first input port and a second input port. The first input port is connected to the first amplifier, and the first amplifier is connected to the engine shaft voltage detector 5 for amplifying the output signal of the engine shaft voltage detector 5. The second input interface is connected to the second amplifier for amplifying the ground current of the carbon brush, and sending the amplified shaft voltage and ground current to the controller through the output port of the amplifier.

[0087] Corresponding to the above method, the present application also discloses a carbon brush, including a carbon brush body and the engine shaft voltage regulating device described in any one of the above. In this solution, the carbon brush body and the engine shaft voltage regulating device may be encapsulated together.

[0088] An automobile includes the above carbon brush, and the automobile may be any type of automobile in the prior art.

[0089] For convenience of description, when describing the above system, various modules are described separately according to functions. Of course, when implementing the present invention, the functions of each module may be implemented in the same or multiple software and / or hardware.

[0090] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for a system or a system embodiment, since it is basically similar to a method embodiment, it is described relatively simply, and the relevant parts can refer to the partial description of the method embodiment. The systems and system embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0091] Those skilled in the art may further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0092] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be directly implemented by hardware, software modules executed by a processor, or a combination of both. The software modules can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0093] It should also be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0094] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for regulating the shaft voltage of an engine, characterized in that, Comprising: Obtaining the shaft voltage of the engine; Judging whether the shaft voltage is greater than a first preset voltage; When the shaft voltage is greater than the first preset voltage, controlling the bottom of the carbon brush to contact the flywheel of the engine; When the carbon brush separation condition is satisfied, controlling the bottom of the carbon brush to be separated from the flywheel of the engine.

2. The engine shaft voltage regulation method according to claim 1, characterized in that, The controlling the bottom of the carbon brush to be separated from the flywheel of the engine when the carbon brush separation condition is satisfied includes: Obtaining the grounding current of the carbon brush; Judging whether the grounding current is less than a first preset current; When the grounding current is less than the first preset current, controlling the bottom of the carbon brush to be separated from the flywheel of the engine.

3. The engine shaft voltage regulation method according to claim 2, wherein The controlling the bottom of the carbon brush to be separated from the flywheel of the engine when the carbon brush separation condition is satisfied includes: When the shaft voltage is not greater than a second preset voltage, controlling the bottom of the carbon brush to be separated from the flywheel of the engine.

4. The engine shaft voltage regulation method according to claim 3, characterized in that Further comprising: When the shaft voltage is less than the first preset voltage, keeping the current state of the bottom of the carbon brush unchanged; When the grounding current is not less than the first preset current, keeping the current state of the bottom of the carbon brush unchanged.

5. The engine shaft voltage regulation method according to claim 1, characterized in that The controlling the bottom of the carbon brush to contact the flywheel of the engine includes: Disconnecting the connection between the electromagnet and the excitation power supply so that the bottom of the carbon brush contacts the flywheel of the engine; Wherein, the excitation power supply is used to supply power to the electromagnet, the electromagnet faces the magnetic metal block, and the magnetic metal block is rigidly connected to the spring in the carbon brush; The controlling the bottom of the carbon brush to be separated from the flywheel of the engine includes: Controlling the electromagnet and the excitation power supply to be in a conducting state so that the bottom of the carbon brush is separated from the flywheel of the engine.

6. An engine shaft voltage regulating device, characterized in that, Comprising: An engine shaft voltage detector for obtaining the shaft voltage of the engine; A controller for judging whether the shaft voltage is greater than a first preset voltage, and when the shaft voltage is greater than the first preset voltage, controlling the bottom of the carbon brush to contact the flywheel of the engine; when the carbon brush separation condition is satisfied, controlling the bottom of the carbon brush to be separated from the flywheel of the engine.

7. The engine shaft voltage regulating device according to claim 6, characterized in that, Further comprising: An excitation power supply; An electromagnet connected to the excitation power supply through a changeover switch; When the controller controls the bottom of the carbon brush to contact the flywheel of the engine, specifically: controlling the changeover switch to disconnect, disconnecting the connection between the electromagnet and the excitation power supply so that the bottom of the carbon brush contacts the flywheel of the engine; When the controller controls the bottom of the carbon brush to be separated from the flywheel of the engine, specifically: controlling the changeover switch to conduct, making the electromagnet and the excitation power supply conduct so that the bottom of the carbon brush is separated from the flywheel of the engine; Wherein, the electromagnet faces the magnetic metal block, and the magnetic metal block is rigidly connected to the spring in the carbon brush.

8. The engine shaft voltage regulating device according to claim 4, characterized in that, The engine shaft voltage detector is an isolated voltage probe.

9. A carbon brush, characterized in that, Comprising a carbon brush body and the engine shaft voltage regulating device according to any one of claims 6 - 8.

10. A vehicle, characterized in that, Comprising the carbon brush according to claim 9.

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