Contact state monitoring system of new energy automobile

Abstract

The utility model discloses a contact state monitoring system of a new energy automobile, which is applied to a power distribution unit of the new energy automobile and comprises a processor module and an isolation power supply. The power supply output end of the isolation power supply is electrically connected with the high-voltage port and is used for outputting a low-voltage direct-current signal to the high-voltage port; the processor module is provided with a first signal input end and a state output end; the first signal input end is connected with the other end of each high-voltage direct-current relay and is used for acquiring a first voltage signal of the other end of the high-voltage direct-current relay before and after the high-voltage direct-current relay is closed; the state output end is configured to output state information when the first voltage signal is qualified, and the state information is used for reflecting the high-voltage direct-current relay. According to the system, the state of the contact of each high-voltage direct-current relay can be monitored, so that the vehicle can implement a corresponding control strategy according to the monitoring result, and the safe operation of the vehicle is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and more specifically, to a contact state monitoring system for a new energy vehicle. Background Art

[0002] At present, new energy vehicles are mainly pure electric or fuel-electric hybrid, and generally require high-voltage power distribution management, that is, the selection between a high-voltage power supply unit and a high-voltage power-consuming unit is completed through the on-off of a high-voltage DC relay. As the number of on-off operations of the high-voltage DC relay increases, it will inevitably suffer from poor contact due to oxidation during long-term use, or contact adhesion due to surface oxidation and heat generation. When a certain contact adheres, a large surge current will be formed when high voltage is applied, which will impact the high-voltage power supply module of the whole vehicle, and poor contact will result in insufficient power supply voltage for the electrical equipment. Therefore, it is necessary to detect the contact state of the contacts of the high-voltage DC relay to ensure the safe operation of the vehicle. Utility Model Content

[0003] In view of this, the present application provides a contact state monitoring system for a new energy vehicle, which is used to monitor the contact state of the contacts of the high-voltage DC relay in the new energy vehicle.

[0004] In order to achieve the above object, the following solutions are proposed:

[0005] A contact state monitoring system for a new energy vehicle is applied to the power distribution unit of the new energy vehicle. The power distribution unit includes a high-voltage port and a plurality of high-voltage DC relays connected to the high-voltage port. One end of each high-voltage DC relay is connected to the high-voltage port, and the other end of each high-voltage DC relay is connected to an electrical port of the new energy vehicle. The contact state monitoring system includes a processor module and an isolated power supply, wherein:

[0006] The power output terminal of the isolated power supply is electrically connected to the high-voltage port, and is used to output a low-voltage DC signal to the high-voltage port;

[0007] The processor module is provided with a first signal input terminal and a state output terminal; the first signal input terminal is respectively connected to the other end of each high-voltage DC relay, and is used to collect a first voltage signal at the other end of the high-voltage DC relay before and after the high-voltage DC relay is closed; the state output terminal is configured to output state information when the first voltage signal is qualified, and the state information is used to reflect the high-voltage DC relay.

[0008] Optionally, the electrical port is a main drive port, a PTC port or an air conditioner port.

[0009] Optionally, the state output terminal is a bus port, which is used to connect to the bus of the new energy vehicle.

[0010] Optionally, the isolated power supply includes a DC / DC unit and a diode, where:

[0011] The output terminal of the DC / DC unit is connected to the positive electrode of the diode;

[0012] The negative electrode of the diode is connected to the high-voltage port.

[0013] Optionally, the DC / DC unit is also connected to the processor module for receiving a power-on control signal of the processor module, and the power-on control signal is used to control the DC / DC unit to output the low-voltage DC signal.

[0014] Optionally, it further includes a low-voltage port, where:

[0015] The low-voltage port is connected to the low-voltage power supply of the new energy vehicle for outputting a driving voltage to the processor module.

[0016] Optionally, the low-voltage port is also connected to the electrical input terminal of the DC / DC unit.

[0017] Optionally, the processor module includes an ADC unit, where:

[0018] The ADC unit is connected to the first signal input terminal for receiving the first voltage signal and performing analog-to-digital processing on the first voltage signal to obtain first voltage data, so that the processor module can judge whether the first voltage signal is qualified according to the first voltage data.

[0019] Optionally, the processor module is also provided with a second signal input terminal, where:

[0020] The second signal input terminal is connected to the high-voltage port for collecting a second voltage signal of the high-voltage port, so that the status output terminal outputs input status information, and the input status information is used to reflect whether the connection status of the high-voltage port is qualified.

[0021] Optionally, the second signal input terminal is connected to the ADC unit, so that the ADC unit performs analog-to-digital conversion on the second voltage signal to obtain second voltage data, so that the processor module can judge whether the connection status of the high-voltage port is qualified according to the second voltage signal.

[0022] As can be seen from the above technical solution, the present application discloses a contact state monitoring system for a new energy vehicle, which is applied to a power distribution unit of a new energy vehicle. The contact state monitoring system includes a processor module and an isolated power supply. The power output terminal of the isolated power supply is electrically connected to the high-voltage port and is used to output a low-voltage DC signal to the high-voltage port. The processor module is provided with a first signal input terminal and a status output terminal. The first signal input terminal is respectively connected to the other ends of each high-voltage DC relay and is used to collect the first voltage signal at the other ends of the high-voltage DC relays before and after the high-voltage DC relays are closed. The status output terminal is configured to output status information when the first voltage signal is qualified, and the status information is used to reflect the high-voltage DC relay. Through the above system, the status of the contacts of each high-voltage DC relay can be monitored, so that the vehicle can implement corresponding control strategies according to the monitoring results, thereby ensuring the safe operation of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application 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 some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of a contact state monitoring system for a new energy vehicle according to an embodiment of the present application;

[0025] Figure 2 Schematic diagram of another contact state monitoring system for a new energy vehicle according to an embodiment of the present application;

[0026] Figure 3 Schematic diagram of yet another contact state monitoring system for a new energy vehicle according to an embodiment of the present application;

[0027] Figure 4 Schematic diagram of yet another contact state monitoring system for a new energy vehicle according to an embodiment of the present application;

[0028] Figure 5 Schematic diagram of yet another contact state monitoring system for a new energy vehicle according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0030] The contact state monitoring system of the present application is applied to new energy vehicles, specifically to the power distribution unit of the new energy vehicle, and is used to monitor the state of the contacts of the high-voltage DC relays in the power distribution unit, and output the monitoring results to the vehicle controller, so that the vehicle controller can control the new energy vehicle based on the contact state. The new energy vehicle includes, but is not limited to, pure electric vehicles and hybrid electric vehicles.

[0031] The power distribution unit in this embodiment at least includes a high-voltage port and a plurality of high-voltage DC relays RELAY connected to the high-voltage port. Specifically, one end of each high-voltage DC relay is connected to the high-voltage port P1, and the other end is connected to a power consumption port, such as Figure 1 shown. Among them, the power consumption ports here include, but are not limited to, the main drive port, the PTC port, and the air conditioner port, which are respectively used to supply power to the main drive module, the PTC heater, and the air conditioner. The high-voltage port is connected to the voltage output terminal of the battery pack on the vehicle, and is used to obtain electric energy from the battery pack and output it to each power consumption unit under the control of the vehicle control unit.

[0032] As Figure 1 shown, the contact state monitoring system provided in this embodiment includes a processor module 10 and an isolated power supply 20.

[0033] The power output terminal of the isolated power supply of the present application is electrically connected to the high-voltage port. When it meets the preset conditions, such as receiving a power-on instruction or receiving an input voltage, it outputs a low-voltage DC signal with a preset voltage to the high-voltage port based on its own power supply or an external power supply. In addition, the isolated power supply can also output a sine wave signal, a square wave signal, or other coded signals with a certain period.

[0034] The isolated power supply can generate high-voltage isolation with the high-voltage port, that is, it can output the low-voltage DC signal to the high-voltage port, and when the high-voltage port is connected to high voltage, it can withstand a high-voltage input with a voltage much higher than the voltage of the low-voltage DC signal. Specifically, the isolated power supply includes a DC / DC unit and a diode D. The DC / DC unit changes its input voltage to the low-voltage DC signal based on its fixed turns ratio or variable turns ratio under a control instruction, and the low-voltage DC signal is output to the high-voltage port through the diode. The diode is preferably a fast-recovery diode with high voltage withstand, such as 1000 volts of voltage withstand. Currently, the output voltage of the vehicle's battery pack is generally 400 volts or 750 volts. Therefore, a fast-recovery diode with 1000 volts of voltage withstand can generally block the damage of high voltage to the DC / DC unit.

[0035] The processor module includes at least a first signal input terminal 11 and a status output terminal 12. The first signal input terminals are respectively connected to the other ends of the commercially available high-voltage DC relays, and are used to collect the first voltage signals output by the corresponding high-voltage DC relays before and after closing. According to the working principle of the high-voltage DC relay, its voltage should be 0 V when it is open, and should be the same as the voltage of the high-voltage port when it is closed. Since an isolated power supply is used in this application to output a low-voltage DC signal to the high-voltage port, the voltage of the first voltage signal should be 0 V or the voltage value of the low-voltage DC signal. If this rule is not met, it indicates that the first voltage signal is unqualified and reflects that the high-voltage DC relay has a fault.

[0036] Specifically, if the voltage of the first voltage signal is the voltage value of the first DC signal when the high-voltage DC relay is controlled to open, it indicates that the corresponding high-voltage DC relay contact is stuck. On the contrary, if it is 0 V, it is normal; if the voltage of the first voltage signal is 0 V when the high-voltage DC relay is controlled to close, it indicates that the contact of the high-voltage DC relay cannot be closed. If the voltage of the first voltage signal is greater than 0 V but less than the voltage of the above low-voltage DC signal at this time, it indicates that the contact is poor. However, if the voltage of the first voltage signal is equal to the voltage of the low-voltage DC signal, it indicates that the contact is good.

[0037] The status output terminal is used to output status information, which is generally connected to the vehicle control system through a bus. Therefore, the status output terminal is a bus port, such as a CAN port, a LIN port, etc. The status information here reflects the contact status of the corresponding high-voltage DC relay in the form of digital information, such as the stuck state, the non-closure state, the poor contact state or the good contact state.

[0038] From the above technical solution, it can be seen that this embodiment provides a contact status monitoring system for a new energy vehicle, which is applied to the power distribution unit of the new energy vehicle. The contact status monitoring system includes a processor module and an isolated power supply. The power output terminal of the isolated power supply is electrically connected to the high-voltage port and is used to output a low-voltage DC signal to the high-voltage port; the processor module is provided with a first signal input terminal and a status output terminal; the first signal input terminals are respectively connected to the other ends of each high-voltage DC relay and are used to collect the first voltage signals at the other ends of the high-voltage DC relays before and after closing; the status output terminal is configured to output status information when the first voltage signal is qualified, and the status information is used to reflect the high-voltage DC relay. Through the above system, the contact status of each high-voltage DC relay can be monitored, so that the vehicle can implement corresponding control strategies according to the monitoring results, thus ensuring the safe operation of the vehicle.

[0039] The processor module in this application includes an ADC unit. The ADC unit is connected to the first signal input terminal and is used to perform analog-to-digital conversion on the input first voltage signal, and sequentially input the obtained multiple first voltage data into the calculation unit or module (not shown) therein, so that the technical unit or module judges the first voltage data to determine whether the first voltage signal is qualified.

[0040] In addition, the processor module further includes a second signal input terminal 12. The second signal input terminal is connected to the high-voltage port. As Figure 2 shown, it is used to collect the second voltage signal of the high-voltage port when the high-voltage port is not connected to the battery pack, and output the second voltage signal to the ADC module for analog-to-digital conversion to obtain second voltage data. The processor module is also used to judge the second voltage data to obtain the input status information of the high-voltage port. The input status information can also be output to the data bus by the status output terminal. The input status information reflects whether the high-voltage port is normal. If the voltage of the high-voltage port is the same as the output voltage of the isolated power supply, it indicates normal.

[0041] In addition, the DC / DC unit of this application is also connected to the processor module. As Figure 3 shown, it is used to receive the power-on control signal output by the processor module, so that it outputs the low-voltage DC signal to the high-voltage port only when it receives the power-on control signal of the processor module. The power source of the DC / DC unit can be the 24V drive voltage sent by the processor module to it, or directly from the low-voltage port P2. As Figure 4 shown, it can also be the 24V drive voltage forwarded by the processor module from the low-voltage port to it. As Figure 5 shown.

[0042] Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0043] Although the preferred embodiments of the embodiments of this application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of this application.

[0044] Finally, it should also be noted that in this article, 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 terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the said element.

[0045] The technical solutions provided in this application have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A contact state monitoring system for a new energy vehicle, applied to a power distribution unit of the new energy vehicle, wherein the power distribution unit comprises a high-voltage port and a plurality of high-voltage DC relays connected to the high-voltage port, one end of each of the high-voltage DC relays is connected to the high-voltage port, and the other end of each of the high-voltage DC relays is connected to a power port of the new energy vehicle, characterized in that: The contact state monitoring system comprises a processor module and an isolated power supply, wherein: The power output end of the isolated power supply is electrically connected to the high voltage port, and is used to output a low voltage DC signal to the high voltage port; The processor module is provided with a first signal input terminal and a status output terminal; the first signal input terminal is respectively connected to the other end of each of the high-voltage DC relays, and is used to collect the first voltage signal of the other end of the high-voltage DC relay before and after the high-voltage DC relay is closed; the status output terminal is configured to output status information when the first voltage signal is qualified, and the status information is used to reflect the high-voltage DC relay.

2. The contact state monitoring system according to claim 1, characterized in that: The power port is a main drive port, a PTC port or an air conditioning port.

3. The contact state monitoring system according to claim 1, characterized in that: The state output end is a bus port, which is used to connect to the bus of the new energy vehicle.

4. The contact state monitoring system according to claim 1, characterized in that: The isolated power supply comprises a DC / DC unit and a diode, wherein: The output end of the DC / DC unit is connected to the anode of the diode; The cathode of the diode is connected to the high voltage port.

5. The contact state monitoring system according to claim 4, characterized in that: The DC / DC unit is also connected to the processor module and is used to receive a power-on control signal from the processor module. The power-on control signal is used to control the DC / DC unit to output the low-voltage DC signal.

6. The contact state monitoring system according to claim 5, characterized in that: Also included are low pressure ports where: The low-voltage port is connected to the low-voltage power supply of the new energy vehicle and is used to output a driving voltage to the processor module.

7. The contact state monitoring system according to claim 6, characterized in that: The low voltage port is also connected to the electrical input terminal of the DC / DC unit.

8. The contact state monitoring system according to claim 1, characterized in that: The processor module comprises an ADC unit, wherein: The ADC unit is connected to the first signal input terminal, and is used to receive the first voltage signal and perform analog-to-digital processing on the first voltage signal to obtain first voltage data, so that the processor module can judge whether the first voltage signal is qualified according to the first voltage data.

9. The contact state monitoring system according to claim 8, characterized in that: The processor module is also provided with a second signal input terminal, wherein: The second signal input terminal is connected to the high voltage port and is used to collect a second voltage signal of the high voltage port so that the status output terminal outputs input status information, and the input status information is used to reflect whether the connection status of the high voltage port is qualified.

10. The contact state monitoring system according to claim 9, characterized in that: The second signal input terminal is connected to the ADC unit so that the ADC unit performs analog-to-digital conversion on the second voltage signal to obtain second voltage data, so that the processor module determines whether the connection status of the high-voltage port is qualified according to the second voltage signal.

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