Relay protection device, engineering machinery, relay protection control method and device

Abstract

The present disclosure relates to a kind of relay protection equipment, engineering machinery, relay protection control method and device, computer readable storage medium.The relay protection equipment includes: power input contact point;Relay protection module, including bistable relay and output contact point, bistable relay includes contact point, attract coil and release coil, the input end of contact point, the input end of attract coil and the input end of release coil are connected power input contact point, the output end of contact point is connected output contact point;Central control unit, including the first port of connecting output contact point, the second port of connecting the output end of attract coil and the third port of connecting the output end of release coil, central control unit is used to when the voltage of output contact point is less than first threshold and not less than second threshold, control attract coil and release coil alternate power, to make contact point oscillation, wherein, first threshold is less than the standard operating voltage of bistable relay, second threshold is the minimum allowable operating voltage of bistable relay.

Description

Technical Field

[0001] This disclosure relates to the field of electrical control technology for engineering machinery, and in particular to a relay protection device, engineering machinery, relay protection control method and apparatus, and computer-readable storage medium. Background Technology

[0002] With the development of technologies such as intelligent and integrated manufacturing, electrical control technology has experienced rapid growth. As a crucial subsystem of engineering machinery, the electrical system plays a vital role in its performance.

[0003] Taking an excavator as an example, the power supply circuit, preheating circuit, and starting circuit are the three basic load circuits of its electrical system, characterized by large operating current and high load impact. Relay protection equipment is used to provide relay protection for these circuits to reduce the occurrence of faults and abnormal situations.

[0004] Improving the reliability of relay protection equipment and extending its service life are urgent technical problems that need to be solved. Summary of the Invention

[0005] This disclosure provides a relay protection device, engineering machinery, a relay protection control method and apparatus, and a computer-readable storage medium to improve the reliability of the relay protection device, extend its service life, and thereby improve the reliability of the electrical system of the engineering machinery.

[0006] According to one aspect of the present disclosure, a relay protection device is provided, comprising:

[0007] Power input contacts;

[0008] The relay protection module includes a bistable relay and an output contact. The bistable relay includes a contact, a pull-in coil, and a release coil. The input terminals of the contact, the pull-in coil, and the release coil are connected to the power input contact, and the output terminal of the contact is connected to the output contact.

[0009] The central control unit includes a first port connected to the output contacts, a second port connected to the output terminal of the pull-in coil, and a third port connected to the output terminal of the release coil. The central control unit is used to control the pull-in coil and the release coil to be alternately energized when the voltage of the output contacts is less than a first threshold and not less than a second threshold, so as to make the contacts oscillate. The first threshold is less than the standard operating voltage of the bistable relay, and the second threshold is the minimum allowable operating voltage of the bistable relay.

[0010] In some embodiments, the central control unit is further configured to trigger the coil to close the contacts when the voltage of the output contacts is not less than a first threshold or the number of times the contacts oscillate continuously is not less than a set number.

[0011] In some embodiments, the central control unit is used to acquire the voltage of the output contacts once every set time period.

[0012] In some embodiments, the relay protection device further includes: a fault indication unit;

[0013] The central control unit also includes a fourth port connected to the fault indication unit. The central control unit is also used to control the fault indication unit to issue a first fault indication message when the voltage of the output contact is zero; and to control the fault indication unit to issue a second fault indication message when the voltage of the output contact is greater than zero and less than a second threshold.

[0014] In some embodiments, the fault indication unit includes an indicator light or a buzzer.

[0015] In some embodiments, the relay protection module further includes a first storage capacitor, and the input terminal of the contact, the input terminal of the pull-in coil, and the input terminal of the release coil are also connected to the output terminal of the first storage capacitor.

[0016] In some embodiments, the relay protection module further includes a fuse connected in series with a bistable relay, wherein the input end of the fuse is connected to the output end of the contact point, and the output end of the fuse is connected to the output contact point.

[0017] In some embodiments, the relay protection device further includes: a voltage regulator and a second storage capacitor, wherein the input terminal of the voltage regulator is used to connect to the power-on output terminal of the key switch;

[0018] The central control unit also includes a power port, which is connected to the output of the voltage regulator and the output of the second storage capacitor.

[0019] In some embodiments, the regulator is a low-dropout linear regulator (LDO).

[0020] In some embodiments, the number of relay protection modules is three sets, namely, power circuit relay protection module, start-up circuit relay protection module and preheating circuit relay protection module;

[0021] The central control unit also includes a fifth port for connecting to the start output terminal of the key switch, and a sixth port for communicating with the vehicle controller. The central control unit controls the power circuit relay protection module to operate when it receives a power-on signal from the power-on output terminal of the key switch; controls the start circuit relay protection module to operate when it receives a start signal from the start output terminal of the key switch in the power-on state; and controls the preheating circuit relay protection module to operate when it receives a preheating start signal from the vehicle controller in the power-on state.

[0022] In some embodiments, the sixth port of the central control unit is used to connect to the on-board controller of the construction machinery via the Controller Area Network (CAN) bus.

[0023] According to another aspect of the present disclosure, an engineering machine is provided, including the relay protection device described in any of the foregoing technical solutions.

[0024] In some embodiments, the construction machinery includes excavators.

[0025] According to another aspect of the present disclosure, a relay protection control method is provided, applied to the aforementioned relay protection equipment, the relay protection control method comprising:

[0026] Obtain the voltage of the output contacts of the relay protection module;

[0027] When the voltage at the output contact of the relay protection module is less than the first threshold and not less than the second threshold, the coils of the relay protection module are alternately energized to make the contacts of the relay protection module oscillate.

[0028] The first threshold is less than the standard operating voltage of the bistable relay, and the second threshold is the minimum allowable operating voltage of the bistable relay.

[0029] In some embodiments, the relay protection control method further includes:

[0030] When the voltage at the output contact of the relay protection module is not less than the first threshold or the number of times the contacts of the relay protection module oscillate continuously is not less than the set number, the coil of the relay protection module is triggered to close the contacts.

[0031] In some embodiments, obtaining the voltage of the output contacts of the relay protection module includes:

[0032] The voltage of the output contacts of the relay protection module is acquired once every set time period.

[0033] In some embodiments, the relay protection control method further includes:

[0034] When the voltage at the output contact of the relay protection module is zero, the first fault indication message is issued;

[0035] When the voltage at the output contact of the relay protection module is greater than zero and less than the second threshold, a second fault indication message is issued.

[0036] According to another aspect of the present disclosure, a relay protection control device is provided, comprising:

[0037] The acquisition unit is used to acquire the voltage of the output contacts of the relay protection module;

[0038] The control unit is used to control the pull-in coil and release coil of the relay protection module to be alternately energized when the voltage of the output contact of the relay protection module is less than a first threshold and not less than a second threshold, so as to make the contacts of the relay protection module oscillate.

[0039] The first threshold is less than the standard operating voltage of the bistable relay, and the second threshold is the minimum allowable operating voltage of the bistable relay.

[0040] According to another aspect of the present disclosure, a relay protection control device is provided, comprising:

[0041] Memory; and

[0042] A processor coupled to a memory is configured to execute the relay protection control method described in any of the foregoing technical solutions based on instructions stored in the memory.

[0043] According to another aspect of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the relay protection control method described in any of the foregoing technical solutions.

[0044] The technical solutions of the above embodiments of this disclosure utilize bistable relays in the relay protection module. These relays offer advantages such as energy saving, low coil heat generation, and effectively reduce contact oxidation, extending contact lifespan. Furthermore, when the voltage at the output contacts of the relay protection module is less than a first threshold and not less than a second threshold, the contact points can be repeatedly struck by oscillations caused by the alternating energization of the pull-in and release coils. This effectively reduces the accumulation of foreign matter on the contacts and improves their electrical contact. Therefore, the technical solutions of the embodiments of this disclosure can effectively improve the reliability of relay protection equipment, extend its service life, and consequently enhance the reliability of the electrical systems of engineering machinery.

[0045] Other features and advantages of this disclosure will become clear from the following detailed description of embodiments with reference to the accompanying drawings. Attached Figure Description

[0046] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0047] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0048] Figure 1 This is a schematic diagram of the relay protection equipment for excavators in related technologies;

[0049] Figure 2This is a schematic diagram of a relay protection device according to some embodiments of the present disclosure;

[0050] Figure 3 This is a flowchart of a relay protection control method according to some embodiments of the present disclosure;

[0051] Figure 4 This is a block diagram of a relay protection control device according to some embodiments of the present disclosure;

[0052] Figure 5 This is a block diagram of a relay protection control device according to other embodiments of this disclosure;

[0053] Figure 6 This is a block diagram of a computer system according to some embodiments of the present disclosure.

[0054] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components. Detailed Implementation

[0055] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the scope of the disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps set forth in these embodiments should be construed as exemplary only and not as limiting.

[0056] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0057] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0058] like Figure 1As shown, a relay protection device 8' applied to an excavator in related technology includes a power circuit relay protection module M1', a starting circuit relay protection module M2', and a preheating circuit relay protection module M3' arranged in parallel. Each set of relay protection modules includes fuses (such as fuses F1', F2', F3'), relays (such as relays K1', K2', K3'), and output contacts (such as output contacts J1', J2', J3'). The relay protection device 8' is applied in the electrical system of the excavator, with the system power supply 10', the main power switch S1', the fuses, the relay contacts, and the output contacts connected in sequence.

[0059] In implementing the embodiments of this disclosure, the inventors noted that in the aforementioned related technologies, when the relay is in normal working condition, its coil is constantly energized, generating significant heat. Furthermore, the contacts remain constantly engaged due to the coil's energization, thus reducing their lifespan. Additionally, the three sets of relay protection modules are located inside the electrical enclosure, making faults difficult to detect and limiting maintainability. These factors severely impact the reliability of the relay protection equipment, and consequently, the reliability of the excavator's electrical system.

[0060] This disclosure provides a relay protection device, engineering machinery, a relay protection control method and apparatus, and a computer-readable storage medium to improve the reliability of the relay protection device, extend its service life, and thereby improve the reliability of the electrical system of the engineering machinery.

[0061] This disclosure provides some embodiments of a relay protection device that can be applied to various types of construction machinery requiring relay protection and has similar beneficial effects. The specific type of construction machinery is not limited; for example, it can be an excavator, road roller, crane, etc. The following description uses the application of the relay protection device to an excavator as an example.

[0062] like Figure 2 As shown, some embodiments of this disclosure provide a relay protection device 8, including a power input contact J4, at least one relay protection module, and a central control unit 100. The relay protection module is, for example, the power circuit relay protection module M1, the start-up circuit relay protection module M2, or the preheating circuit relay protection module M3 shown in the figure. The power input contact J4 can be understood as the terminal for connecting the relay protection device 8 to an external system power supply.

[0063] The power circuit relay protection module M1 includes a bistable relay K1 and an output contact J1. The bistable relay K1 includes a contact H1, an engaging coil Q11, and a releasing coil Q12. The input terminal of contact H1 ( Figure 2The input terminals of each device are represented by "1" and the output terminals by "2". The input terminals of the pull-in coil Q11 and the release coil Q12 are connected to the power input contact J4, and the output terminal of contact H1 is connected to the output contact J1. The output contact J1 is the terminal used by the relay protection device 8 to connect to the external power supply circuit.

[0064] Similarly, the starting circuit relay protection module M2 includes a bistable relay K2 and an output contact J2. The bistable relay K2 includes a contact H2, an engaging coil Q21, and a releasing coil Q22. The input terminals of contact H2, engaging coil Q21, and releasing coil Q22 are connected to the power input contact J4, and the output terminal of contact H2 is connected to the output contact J2. The output contact J2 is the wiring terminal used by the relay protection device 8 to connect to an external starting circuit.

[0065] Similarly, the preheating circuit relay protection module M3 includes a bistable relay K3 and an output contact J3. The bistable relay K3 includes a contact H3, a pull-in coil Q31, and a release coil Q32. The input terminals of contact H3, pull-in coil Q31, and release coil Q32 are connected to the power input contact J4, and the output terminal of contact H3 is connected to the output contact J3. The output contact J3 is the wiring terminal used by the relay protection device 8 to connect to the external preheating circuit.

[0066] The central control unit 100 includes first ports D11, D21, and D31, second ports D12, D22, and D32, and third ports D13, D23, and D33. The first port D11 is connected to output contact J1, the first port D21 is connected to output contact J2, and the first port D31 is connected to output contact J3. The second port D12 is connected to the output terminal of the pull-in coil Q11, the second port D22 is connected to the output terminal of the pull-in coil Q21, and the second port D32 is connected to the output terminal of the pull-in coil Q31. The third port D13 is connected to the output terminal of the release coil Q12, the third port D23 is connected to the output terminal of the release coil Q22, and the third port D33 is connected to the output terminal of the release coil Q32.

[0067] The central control unit 100 is used to control the pull-in coil Q11 and the release coil Q12 to be alternately energized when the voltage of the output contact J1 is less than the first threshold and not less than the second threshold, so that the contact H1 will oscillate, that is, be frequently turned on and off.

[0068] When the voltage at output contact J2 is less than the first threshold and not less than the second threshold, the pull-in coil Q21 and release coil Q22 are alternately energized, causing contact H2 to oscillate, i.e., to be frequently switched on and off; and

[0069] When the voltage at the output contact J3 is less than the first threshold and not less than the second threshold, the pull-in coil Q31 and the release coil Q32 are alternately energized to make the contact H3 oscillate, that is, frequently switched on and off.

[0070] The first threshold is less than the standard operating voltage of the bistable relay, and the second threshold is the minimum allowable operating voltage of the bistable relay.

[0071] The standard operating voltage of a bistable relay is its ideal operating voltage. When the voltage at the output contacts is less than a first threshold but not less than a second threshold, the contact strength decreases, but this does not cause the bistable relay to malfunction. The first threshold can be determined through multiple experiments, taking into account the structure and performance of the bistable relay, and is thus a set value.

[0072] In the electrical system of an excavator, in addition to the relay protection device 8, it typically includes a system power supply 10, a main power switch S1, a key switch S2, and an on-board controller 20. The key switch S2 includes a power input terminal B, a power-on output terminal BR, and a start output terminal C. The power input terminal B of the key switch S2 is connected to the main power switch S1. A fuse F2 can be installed on the line between the main power switch S1 and the power input terminal B to provide overcurrent and short-circuit protection. The central control unit 100, in addition to the first ports D11, D21, D31, the second ports D12, D22, D32, and the third ports D13, D23, and D33, also includes a power port D7, a fourth port D41 connected to the fault indication unit A1, a fourth port D42 connected to the fault indication unit A2, a fourth port D43 connected to the fault indication unit A3, a fifth port D5 connected to the start output terminal C of the key switch S2, and sixth ports D61 and D62 connected to the on-board controller 20.

[0073] The power supply circuit, starting circuit, and preheating circuit are the three basic load circuits of an excavator's electrical system. In this embodiment of the present disclosure, the relay protection device 8 is equipped with a set of relay protection modules for each of these three basic load circuits, namely the power supply circuit relay protection module M1, the starting circuit relay protection module M2, and the preheating circuit relay protection module M3. Each relay protection module is connected to the corresponding load circuit through an output contact (other parts of the load circuit are omitted in the figure).

[0074] like Figure 2As shown, in some embodiments of this disclosure, the relay protection device 8 further includes a voltage regulator 9, the input of which is connected to the power-on output terminal BR of the key switch S2. The power supply port D7 of the central control unit 100 is connected to the output terminal of the voltage regulator 9. The voltage regulator 9 is, for example, a low dropout regulator (LDO), whose input terminal supports a wide voltage range, up to 42V, and whose output terminal outputs a steady-state DC voltage, for example, 5V DC, thereby providing a stable operating voltage for the central control unit 100.

[0075] In this embodiment of the disclosure, the relay protection module employs a bistable relay with two stable states. For example... Figure 2 As shown, taking the bistable relay K1 as an example, when the grounding output is sent to the pull-in coil Q11 at the first moment, the contact H1 changes from a normally open state to a normally closed state. After the pull-in coil Q11 is de-energized, the contact H1 can still maintain the normally closed state under the magnetic field of the polarized soft magnetic material. When the grounding output is sent to the release coil Q12 at the second moment, the contact H1 changes from a normally closed state to a normally open state. After the release coil Q12 is de-energized, the contact H1 can still maintain the normally open state under the magnetic field of the polarized soft magnetic material. The bistable relay does not require the coil to be constantly energized to maintain the contact's closed state; therefore, it has the advantages of energy saving, low power consumption, and low coil heat generation.

[0076] In some embodiments of this disclosure, the central control unit 100 is configured to control the power circuit relay protection module M1 to operate when it receives a power-on signal from the power-on output terminal BR of the key switch S2; control the start circuit relay protection module M2 to operate when it receives a start signal from the start output terminal C of the key switch S2 in the power-on state; and control the preheating circuit relay protection module M3 to operate when it receives a preheating start signal from the vehicle controller 20 in the power-on state.

[0077] For example, after the main power switch S1 is closed, when the operator turns the key switch S2 to the power-on output terminal BR, the power-on output terminal BR is energized, supplying power to the power port D7 of the central control unit 100 through the voltage regulator 9. After receiving the power-on signal, the central control unit 100 outputs ground to the coil Q11 of the bistable relay K1 in the power circuit relay protection module M1, causing the contact H1 to change from a normally open state to a normally closed state, thus turning on the excavator's power circuit. When the power circuit is in the on state, if the voltage at the output contact J1 is detected to be less than the first threshold and not less than the second threshold, it can be determined that the contact of the contact H1 in the power circuit relay protection module M1 has decreased. At this time, the coils Q11 and Q12 are alternately energized, for example, by alternately outputting ground to the coils Q11 and Q12, causing the contact H1 to oscillate and be repeatedly struck, which can effectively reduce the accumulation of foreign objects on the contact H1, thereby improving the electrical contact of the contact H1.

[0078] For example, after the power circuit is turned on, when the operator turns the key switch S2 to the start output terminal C, the start output terminal C outputs a high-level start signal to the central control unit 100. After receiving the start signal from the start output terminal C, the central control unit 100 outputs a ground signal to the bistable relay K2 coil Q21 in the start circuit relay protection module M2, causing the contact H2 to change from a normally open state to a normally closed state, thus turning on the excavator's start circuit. When the start circuit is in the on state, if the voltage at the output contact J2 is less than the first threshold and not less than the second threshold, it can be determined that the contact of the contact H2 in the start circuit relay protection module M2 has decreased. At this time, the energizing coil Q21 and the releasing coil Q22 are alternately energized, for example, by alternately outputting ground signals to the energizing coil Q21 and the releasing coil Q22, causing the contact H2 to oscillate and be repeatedly struck. This can effectively reduce the accumulation of foreign objects on the contact H2, thereby improving the electrical contact of the contact H2.

[0079] For example, after the power circuit is turned on, when the operator presses the preheating button on the excavator control panel, the vehicle controller 20 outputs a preheating start signal to the central control unit 100. Upon receiving the preheating start signal from the vehicle controller 20, the central control unit 100 grounds the coil Q31 of the bistable relay K3 in the preheating circuit relay protection module M3, causing contact H3 to change from a normally open state to a normally closed state, thus turning on the excavator's preheating circuit. When the preheating circuit is in the turned-on state, if the voltage at the output contact J3 is less than the first threshold and not less than the second threshold, it can be determined that the contact of contact H3 in the relay protection module M3 has decreased. At this time, the coils Q31 and Q32 are alternately energized, for example, by alternately grounding the coils Q31 and Q32, causing contact H3 to vibrate and be repeatedly struck. This effectively reduces the accumulation of foreign objects on contact H3, thereby improving the electrical contact of contact H3.

[0080] In some embodiments of this disclosure, the sixth ports D61 and D62 of the central control unit 100 are connected to the vehicle controller 20 via a Controller Area Network (CAN) bus. In some embodiments, the sixth port D61 is used to report information to the vehicle controller 20, and the sixth port D62 is used to receive information sent by the vehicle controller 20, thereby achieving mutual communication. The specific number of sixth ports is not limited and can be designed according to requirements.

[0081] In some embodiments of this disclosure, the contact structure in the relay protection module can be made of copper busbar, which has good electrical conductivity, thermal conductivity, weldability and corrosion resistance.

[0082] It is understood that if the relay protection device provided in this embodiment is applied in other engineering machinery, the number of relay protection modules can be adjusted accordingly as needed, and the specific structure of the electrical system may also be different.

[0083] In related technologies, when the relay of a relay protection module is in normal working condition, the coil is constantly energized, generating a large amount of heat, and the contacts are constantly in a closed state due to the energized coil. Prolonged exposure to high current makes the contacts prone to oxidation and the accumulation of foreign matter. Over time, this not only affects the reliability of the electrical contact but also reduces the service life of the contacts.

[0084] In this embodiment, the relay protection module uses a bistable relay, which does not require the coil to be continuously energized to maintain the contact's closed state. This offers advantages such as energy saving, low coil heat generation, and effectively reduces contact oxidation, extending contact lifespan. Furthermore, in this embodiment, when the voltage at the output contact is less than a first threshold but not less than a second threshold, it can be determined that the contact contact has decreased. At this time, the energizing coil and the releasing coil are alternately energized, for example, by alternately grounding the energizing and releasing coils. This causes the contacts to oscillate, repeatedly striking them, effectively reducing the accumulation of foreign matter on the contacts and improving their electrical contact. Therefore, adopting the technical solution of this embodiment can effectively improve the reliability of relay protection equipment, extend its service life, and thus improve the reliability of the electrical system of engineering machinery.

[0085] Furthermore, in this embodiment, the relay protection device adopts a platform-based and integrated design approach, with each relay protection module and voltage regulator integrated with the central control unit, resulting in a more compact structure, smaller device size, and significantly reduced cost.

[0086] In a further embodiment of this disclosure, the central control unit 100 is also configured to trigger a coil to close the contacts when the voltage of each of the aforementioned output contacts is not less than a first threshold or the number of times the contacts oscillate continuously is not less than a set number. As described above, by repeatedly striking the contacts through oscillation, the electrical contactability of the contacts can be improved, and the contact resistance can be reduced. After certain conditions are met, the coil can be triggered to close the contacts, restoring the normal operating state of the bistable relay. The set number can be determined based on the performance of the bistable relay and experience; for example, the set number can be set to 5 times.

[0087] In some embodiments of this disclosure, the central control unit 100 is used to acquire the voltage of the output contacts once every set time period, that is, every set maintenance cycle.

[0088] The set time period can be determined through multiple tests, taking into account the structure, operating performance, and rated service life of the bistable relay. For example, in one embodiment, the voltage of the output contacts is acquired every 500 hours to perform self-checks and maintenance on the contact performance. This embodiment ensures the normal number of times the contacts close, extending their service life and guaranteeing that the bistable relay operates normally most of the time.

[0089] Please refer to Figure 2 As shown, in some embodiments of this disclosure, the relay protection device 8 may further include a fault indication unit A1 for the power circuit relay protection module M1, a fault indication unit A2 for the start-up circuit relay protection module M2, and a fault indication unit A3 for the preheating circuit relay protection module M3. The specific type of the fault indication unit is not limited, and it may be an indicator light or a buzzer. The central control unit 100 is connected to the fault indication unit A1 via the fourth port D41, to the fault indication unit A2 via the fourth port D42, and to the fault indication unit A3 via the fourth port D43. The central control unit 100 is further configured to: control the fault indication unit A1 to issue a first fault indication message when the voltage of the output contact J1 is zero; control the fault indication unit A1 to issue a second fault indication message when the voltage of the output contact J1 is greater than zero and less than a second threshold; control the fault indication unit A2 to issue a first fault indication message when the voltage of the output contact J2 is zero; control the fault indication unit A2 to issue a second fault indication message when the voltage of the output contact J2 is greater than zero and less than the second threshold; and control the fault indication unit A3 to issue a first fault indication message when the voltage of the output contact J3 is zero; control the fault indication unit A3 to issue a second fault indication message when the voltage of the output contact J3 is greater than zero and less than the second threshold.

[0090] Taking the power circuit relay protection module M1 as an example, when the voltage at output contact J1 is zero, it can be determined that an open circuit has occurred in the load circuit. The fault indication unit A1 issues a first fault indication message, such as a constantly lit indicator light or a continuous buzzer sound, thus promptly alerting the operator to the fault. When the voltage at output contact J1 is greater than zero and less than a second threshold, it can be determined that the contact resistance of contact H1 is too high, seriously affecting the normal operation of the load circuit and relay protection. The fault indication unit A1 issues a second fault indication message, such as a flashing indicator light or intermittent buzzer sound, thus promptly alerting the operator to the fault. Using this embodiment, automatic fault diagnosis and alerting can be achieved, improving the intelligence level of relay protection equipment.

[0091] In addition, in some embodiments of this disclosure, when the central control unit 100 determines that a certain load circuit has an open circuit fault or a fault with excessive contact resistance, it can also report the corresponding fault code to the vehicle controller 20 through the sixth port D61. The vehicle controller 20 analyzes and self-diagnoses the fault, and then outputs the diagnostic results to output devices such as displays and indicator lights.

[0092] In some embodiments of this disclosure, such as Figure 2 As shown, the power circuit relay protection module M1 may further include a first storage capacitor C11 and a fuse F11. The input terminals of contact H1, the pull-in coil Q11, and the release coil Q12 are also connected to the output terminal of the first storage capacitor C11. The fuse F11 is connected in series with a bistable relay K1. The input terminal of the fuse F11 is connected to the output terminal of contact H1, and the output terminal of the fuse F11 is connected to the output contact J1. The start-up circuit relay protection module M2 may further include a first storage capacitor C12 and a fuse F12. The input terminals of contact H2, the pull-in coil Q21, and the release coil Q22 are also connected to the output terminal of the first storage capacitor C12. The fuse F12 is connected in series with a bistable relay K2. The input terminal of the fuse F12 is connected to the output terminal of contact H2, and the output terminal of the fuse F12 is connected to the output contact J2. The preheating circuit relay protection module M3 may also include a first storage capacitor C13 and a fuse F13. The input terminal of contact H3, the input terminal of the pull-in coil Q31, and the input terminal of the release coil Q32 are also connected to the output terminal of the first storage capacitor C13. The fuse F13 is connected in series with the bistable relay K3. The input terminal of the fuse F13 is connected to the output terminal of contact H3, and the output terminal of the fuse F13 is connected to the output contact J3.

[0093] As a protective device, the fuse can provide short-circuit and overcurrent protection for the load circuit, preventing the device from burning out. The first storage capacitor can supply power to the release coil in the event of an abnormal interruption of power supply to the bistable relay, such as when the system's main power switch is abnormally disconnected, thereby ensuring that the release coil can be released normally.

[0094] Please refer to Figure 2 As shown, in some embodiments of this disclosure, the relay protection device 8 further includes a second storage capacitor C2. The power supply port D7 of the central control unit 100 is simultaneously connected to the output terminal of the voltage regulator 9 and the output terminal of the second storage capacitor C2. The second storage capacitor C2 can continue to supply power to the central control unit 100 after the power-on output terminal BR of the key switch is de-energized. On the one hand, this ensures that the release coil of the bistable relay can be released normally, preventing the system from generating static power consumption due to leakage current. On the other hand, it also enables the vehicle controller 20 to perform delayed control of the central control unit 100.

[0095] In summary, the relay protection devices of the above embodiments of this disclosure not only have better reliability in providing relay protection for load circuits, but also have a longer service life and a higher degree of integration and intelligence, which can effectively improve the reliability and intelligence of the electrical system of engineering machinery.

[0096] This disclosure also provides an engineering machinery, including the relay protection device of any of the foregoing embodiments, in some embodiments. Specific types of engineering machinery include, but are not limited to, excavators, whose electrical systems exhibit significantly improved reliability and intelligence.

[0097] like Figure 3 As shown, some embodiments of this disclosure also provide a relay protection control method, applied to the aforementioned relay protection device, the method including the following steps S101-S102.

[0098] Step S101: Obtain the voltage of the output contacts of the relay protection module;

[0099] Step S102: When the voltage of the output contact of the relay protection module is less than the first threshold and not less than the second threshold, control the coil of the relay protection module to be energized alternately so as to make the contacts of the relay protection module oscillate.

[0100] The first threshold is less than the standard operating voltage of the bistable relay, and the second threshold is the minimum allowable operating voltage of the bistable relay.

[0101] In some embodiments of this disclosure, the relay protection control method further includes the following steps:

[0102] When the voltage at the output contact of the relay protection module is not less than the first threshold or the number of times the contacts of the relay protection module oscillate continuously is not less than the set number, the coil of the relay protection module is triggered to close the contacts.

[0103] In some embodiments of this disclosure, obtaining the voltage of the output contacts of the relay protection module includes:

[0104] The voltage of the output contacts of the relay protection module is acquired once every set time period.

[0105] In some embodiments of this disclosure, the relay protection control method further includes the following steps:

[0106] When the voltage at the output contact of the relay protection module is zero, the first fault indication message is issued;

[0107] When the voltage at the output contact of the relay protection module is greater than zero and less than the second threshold, a second fault indication message is issued.

[0108] In the technical solution of this disclosure embodiment, when the voltage of the output contact is less than a first threshold and not less than a second threshold, it can be determined that the contact performance is reduced. At this time, the energizing coil and the releasing coil are alternately energized, for example, by alternately outputting ground to the energizing coil and the releasing coil, thereby causing the contact to oscillate. The contact is repeatedly struck, which can effectively reduce the accumulation of foreign objects on the contact, thereby improving the electrical contact performance. By causing the contact to oscillate and be struck repeatedly, the electrical contact performance of the contact can be improved and the contact resistance reduced. After certain conditions are met, the energizing coil can be triggered to close the contact, restoring the normal working state of the bistable relay. When a load circuit experiences an open circuit fault or a fault with excessive contact resistance, the issued first fault indication information or second fault information can promptly prompt the operator to intervene, realizing automatic fault diagnosis and prompting, with a high degree of intelligence. Therefore, the relay protection control method of this disclosure embodiment can effectively improve the reliability of relay protection equipment, extend its service life, and thus improve the reliability of the electrical system of engineering machinery.

[0109] like Figure 4 As shown, some embodiments of this disclosure also provide a relay protection control device, including:

[0110] Acquisition unit 41 is used to acquire the voltage of the output contacts of the relay protection module;

[0111] The control unit 42 is used to control the pull-in coil and release coil of the relay protection module to be alternately energized when the voltage of the output contact of the relay protection module is less than a first threshold and not less than a second threshold, so as to make the contacts of the relay protection module oscillate.

[0112] The first threshold is less than the standard operating voltage of the bistable relay, and the second threshold is the minimum allowable operating voltage of the bistable relay.

[0113] like Figure 5 As shown, some embodiments of this disclosure also provide a relay protection control device, including: a memory 51 and a processor 52 coupled to the memory 51, the processor 52 being configured to execute the relay protection control method as described in any of the foregoing embodiments based on instructions stored in the memory 51.

[0114] It should be understood that each step in the aforementioned relay protection control method can be implemented by a processor, and can be implemented by software, hardware, firmware, or any combination thereof.

[0115] In addition to the relay protection control methods and devices described above, embodiments of this disclosure may also take the form of a computer program product implemented on one or more non-volatile storage media containing computer program instructions. Therefore, some embodiments of this disclosure also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the relay protection control method as described in any of the foregoing technical solutions.

[0116] Figure 6 A schematic diagram of a computer system according to some embodiments of the present disclosure is shown. For example... Figure 6 As shown, the computer system can be represented in the form of a general-purpose computing device, which can be used to implement the relay protection control method of the above embodiments. The computer system includes a memory 61, a processor 62, and a bus 60 connecting different system components.

[0117] The memory 61 may include, for example, system memory, non-volatile storage media, etc. The system memory may store, for example, an operating system, application programs, a boot loader, and other programs. The system memory may include volatile storage media, such as random access memory (RAM) and / or cache memory. The non-volatile storage media may store, for example, instructions for executing the corresponding embodiments of the above-described relay protection control method. Non-volatile storage media include, but are not limited to, disk storage, optical storage, flash memory, etc.

[0118] The processor 62 can be implemented using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete hardware components such as discrete gates or transistors. Accordingly, each module, such as the decision module and the determination module, can be implemented by the central processing unit (CPU) running instructions in memory to execute the corresponding steps, or by dedicated circuitry to execute the corresponding steps.

[0119] Bus 60 can use any of the various bus architectures. For example, bus architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MCA) bus, and the Peripheral Component Interconnect (PCI) bus.

[0120] The computer system may also include an input / output interface 63, a network interface 64, and a storage interface 65. The input / output interface 63, network interface 64, storage interface 65, memory 61, and processor 62 can be connected via a bus 60. The input / output interface 63 provides a connection interface for input / output devices such as a monitor, mouse, and keyboard. The network interface 64 provides a connection interface for various networked devices. The storage interface 65 provides a connection interface for external storage devices such as floppy disks, USB flash drives, and SD cards.

[0121] Various embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0122] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A relay protection device, comprising: a power input terminal; a relay protection module, comprising a bistable relay and an output terminal, the bistable relay comprising a contact, a pull-in coil and a release coil, an input end of the contact, an input end of the pull-in coil and an input end of the release coil being connected to the power input terminal, an output end of the contact being connected to the output terminal; a central control unit, comprising a first port connected to the output terminal, a second port connected to an output end of the pull-in coil, and a third port connected to an output end of the release coil, the central control unit being configured to control the pull-in coil and the release coil to be powered alternately to make the contact oscillate when a voltage of the output terminal is less than a first threshold and not less than a second threshold, wherein the first threshold is less than a standard operating voltage of the bistable relay, and the second threshold is a minimum allowable operating voltage of the bistable relay, and the central control unit is further configured to trigger the pull-in coil to close the contact when the voltage of the output terminal is not less than the first threshold or a number of continuous oscillations of the contact is not less than a set number; a voltage stabilizer and a second storage capacitor, an input end of the voltage stabilizer being configured to be connected to an upper power output end of a key switch, wherein the central control unit further comprises a power supply port connected to an output end of the voltage stabilizer and an output end of the second storage capacitor, and a sixth port configured to communicate with a vehicle-mounted controller and connected to the vehicle-mounted controller through a controller area network bus; a fault indication unit, and the central control unit further comprises a fourth port connected to the fault indication unit, wherein the central control unit is further configured to determine that there is an open circuit in a circuit where the relay protection module is located when the voltage of the output terminal is zero, control the fault indication unit to send first fault indication information, and determine that a contact resistance of the contact is greater than a preset threshold when the voltage of the output terminal is greater than zero and less than the second threshold, control the fault indication unit to send second fault indication information, and the central control unit is further configured to report a fault code corresponding to the open circuit in the circuit where the relay protection module is located or the contact resistance of the contact being greater than the preset threshold to the vehicle-mounted controller through the sixth port when there is the open circuit in the circuit where the relay protection module is located or the contact resistance of the contact is greater than the preset threshold.

2. The relaying device of claim 1, wherein: The central control unit is configured to obtain the voltage of the output terminal once every set time period.

3. The relaying device of claim 1, wherein: The fault indication unit comprises an indicator light or a buzzer.

4. The relaying device of claim 1, wherein: The relay protection module further comprises a first storage capacitor, and the input end of the contact, the input end of the pull-in coil and the input end of the release coil are further connected to an output end of the first storage capacitor.

5. The relaying device of claim 4, wherein: The relay protection module further comprises a fuse connected in series with the bistable relay, an input end of the fuse being connected to the output end of the contact, and an output end of the fuse being connected to the output terminal.

6. The relaying device of claim 1, wherein: The voltage stabilizer is a low dropout linear voltage regulator (LDO).

7. The relay protection device according to claim 1, wherein: the number of the relay protection modules is three, which are a power circuit relay protection module, a starting circuit relay protection module and a preheating circuit relay protection module, respectively. The central control unit further comprises a fifth port for connecting an enabling output of the key switch, and the central control unit is configured to control the power circuit relay protection module to work when receiving a power-on signal from a power-on output of the key switch, control the starting circuit relay protection module to work when receiving an enabling signal from an enabling output of the key switch in the power-on state, and control the preheating circuit relay protection module to work when receiving a preheating enabling signal from the vehicle-mounted controller in the power-on state.

8. A construction machine comprising the relay protection device according to any one of claims 1-7.

9. The working machine according to claim 8, wherein: The construction machine comprises an excavator.

10. A relay protection control method applied to the relay protection device of claim 1, comprising: acquiring a voltage of an output contact of the relay protection module; controlling the attraction coil and the release coil of the relay protection module to be powered alternately when the voltage of the output contact of the relay protection module is less than a first threshold value and not less than a second threshold value, so as to make the contact of the relay protection module oscillate; triggering the attraction coil of the relay protection module to close the contact when the voltage of the output contact of the relay protection module is not less than the first threshold value or the contact of the relay protection module continuously oscillates for not less than a set number of times; determining that a circuit in which the relay protection module is located has a disconnection when the voltage of the output contact of the relay protection module is zero, and sending first fault indication information; determining that a contact resistance of the contact is greater than a preset threshold value when the voltage of the output contact of the relay protection module is greater than zero and less than the second threshold value, and sending second fault indication information; reporting, through a controller area network bus, a fault code corresponding to the disconnection of the circuit in which the relay protection module is located or the contact resistance of the contact being greater than the preset threshold value to a vehicle-mounted controller when the circuit in which the relay protection module is located has the disconnection or the contact resistance of the contact is greater than the preset threshold value. The first threshold value is less than a standard working voltage of the bistable relay, and the second threshold value is a minimum allowable working voltage of the bistable relay.

11. The method of claim 10, wherein: The acquiring of the voltage of the output contact of the relay protection module comprises: acquiring the voltage of the output contact of the relay protection module once every set time period.

12. A relay protection control device, comprising: an acquiring unit configured to acquire a voltage of an output contact of a relay protection module; a control unit configured to control an attraction coil and a release coil of the relay protection module to be powered alternately when the voltage of the output contact of the relay protection module is less than a first threshold value and not less than a second threshold value, so as to make a contact of the relay protection module oscillate, and trigger the attraction coil of the relay protection module to close the contact when the voltage of the output contact of the relay protection module is not less than the first threshold value or the contact of the relay protection module continuously oscillates for not less than a set number of times, and determine that a circuit in which the relay protection module is located has a disconnection when the voltage of the output contact of the relay protection module is zero, and send first fault indication information; determine that a contact resistance of the contact is greater than a preset threshold value when the voltage of the output contact of the relay protection module is greater than zero and less than the second threshold value, and send second fault indication information; When there is a circuit break or the contact resistance of the circuit where the relay protection module is located is greater than a preset threshold, a fault code corresponding to the circuit break or the contact resistance of the circuit where the relay protection module is located being greater than the preset threshold is reported to the vehicle-mounted controller through the controller area network bus. The first threshold is less than a standard operating voltage of the bistable relay, and the second threshold is a minimum allowable operating voltage of the bistable relay. 13.A relay protection control device, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the relay protection control method according to any one of claims 10-11 based on instructions stored in the memory. 14.A computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor to implement the relay protection control method according to any one of claims 10-11.

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