A vehicle-mounted high-voltage power distribution control method, device, equipment and vehicle

Abstract

The application relates to a vehicle-mounted high-voltage power distribution control method, device, equipment and vehicle, and is used for solving the problem that when an AC discharge control circuit DCAC and a DC conversion control circuit DCDC work simultaneously, the rated output power of the DC conversion control circuit DCDC decreases, and the low-voltage load power supply of the whole vehicle cannot meet the requirements. The vehicle-mounted high-voltage power distribution control method comprises the following steps: when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC work simultaneously, according to the fault state of the AC discharge control circuit DCAC, the working state of the DC conversion control circuit DCDC, the voltage of a low-voltage storage battery and the level balance state of the low-voltage storage battery, temporarily stopping the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle power supply processing, in particular to a vehicle-mounted high-voltage power distribution control method, device, equipment and vehicle. BACKGROUND

[0002] The vehicle-mounted high-voltage power distribution unit is mainly responsible for power distribution and management in the high-voltage system of a new energy vehicle. The vehicle-mounted high-voltage power distribution unit can provide functions such as on-board charger control (OBC), alternating current discharge control circuit DCAC, direct current conversion control circuit DCDC, and circuit overload protection for the entire vehicle. To reduce costs, the mainstream technology currently adopts a multi-in-one technical route for the vehicle-mounted high-voltage power distribution unit. Specifically, from the design of the hardware electrical principle, the alternating current discharge control circuit and the direct current conversion control circuit usually share a high-voltage input end. The defect of this design is that when the alternating current discharge control circuit DCAC and the direct current conversion control circuit DCDC work simultaneously, the output capacity of the direct current conversion control circuit usually decreases, and in extreme cases, it can cause the low-voltage load power supply of the entire vehicle to be unable to meet the requirements. For example: when only the direct current conversion control circuit DCDC works, the rated output power of the direct current conversion control circuit DCDC can reach 3KW; when the alternating current discharge control circuit DCAC and the direct current conversion control circuit DCDC work simultaneously, the rated output power of the direct current conversion control circuit DCDC will decrease to 2KW, and the decrease in the rated output power of the direct current conversion control circuit DCDC will cause some low-voltage loads to be unable to work normally. SUMMARY

[0003] The present application provides a vehicle-mounted high-voltage power distribution control method, device, equipment and vehicle, which is used to solve the problem that when the alternating current discharge control circuit DCAC and the direct current conversion control circuit DCDC work simultaneously, the decrease in the rated output power of the direct current conversion control circuit DCDC causes the low-voltage load power supply of the entire vehicle to be unable to meet the requirements.

[0004] The technical scheme of the present application is as follows:

[0005] On the one hand, the present application also provides a vehicle-mounted high-voltage power distribution control method, which comprises the following steps:

[0006] When the alternating current discharge control circuit DCAC and the direct current conversion control circuit DCDC work simultaneously, according to the fault state of the alternating current discharge control circuit DCAC, the working state of the direct current conversion control circuit DCDC, the voltage of the low-voltage storage battery and the level balance state of the low-voltage storage battery, the alternating current discharge control circuit DCAC is temporarily shut down or the output power of the alternating current discharge control circuit DCAC is temporarily limited.

[0007] Preferably, the step of temporarily shutting down the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC according to the fault state of the AC discharge control circuit DCAC, the working state of the DC conversion control circuit DCDC, the voltage of the low-voltage storage battery and the balance state of the low-voltage storage battery comprises:

[0008] The AC discharge control circuit DCAC is temporarily shut down when any of the following conditions is met:

[0009] If the fault level of the AC discharge control circuit DCAC is a first preset fault level;

[0010] If the DC conversion control circuit DCDC is in a closed state;

[0011] If the voltage of the low-voltage storage battery is less than or equal to a first preset voltage and has lasted for a first preset time length;

[0012] If the balance state of the low-voltage storage battery shows that it is in a discharging state and the discharging current exceeds a preset current;

[0013] The output power of the AC discharge control circuit DCAC is temporarily limited when any of the following conditions is met:

[0014] If the voltage of the low-voltage storage battery is greater than the first preset voltage and less than a second preset voltage, and the fault level of the AC discharge control circuit DCAC is a second preset fault level;

[0015] If the voltage of the low-voltage storage battery is greater than the first preset voltage and less than the second preset voltage, and the balance state of the low-voltage storage battery shows that it is in a discharging state and the discharging current does not exceed the preset current;

[0016] If the voltage of the low-voltage storage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the balance state of the low-voltage storage battery shows that it is in a discharging state and the discharging current does not exceed the preset current;

[0017] The second preset fault level is less than the first preset fault level.

[0018] Preferably,

[0019] The step of temporarily limiting the output power of the AC discharge control circuit DCAC comprises:

[0020] If the voltage of the low-voltage storage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the balance state of the low-voltage storage battery shows that it is not discharging externally, the output power of the AC discharge control circuit DCAC is temporarily limited to a preset output power;

[0021] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery shows that it is in a discharging state and the discharge current does not exceed the preset current, or if the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level and the electrical balance state of the low-voltage battery shows that it is in a discharging state and the discharge current does not exceed the preset current, the output power of the AC discharge control circuit DCAC is temporarily limited according to the discharge current of the low-voltage battery.

[0022] Preferably, the vehicle-mounted high-voltage power distribution control method further includes:

[0023] During the period of temporarily shutting down the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC, if it is recognized that the vehicle power gear has been switched, the timer is reset;

[0024] After the reset timing is completed or the timing is completed, if the fault state of the AC discharge control circuit DCAC, the working state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery and the electrical balance state of the low-voltage battery meet the normal working state of the AC discharge control circuit DCAC, the normal output power of the AC discharge control circuit DCAC is restored.

[0025] Preferably, the normal working state of the AC discharge control circuit DCAC refers to:

[0026] The fault level of the AC discharge control circuit DCAC is less than or equal to the second preset fault level, the working state of the DC conversion control circuit DCDC is on, and the voltage of the low-voltage battery is greater than or equal to the second preset voltage.

[0027] On the other hand, the present application also provides a vehicle-mounted high-voltage power distribution control device, the vehicle-mounted high-voltage power distribution control device comprising:

[0028] The DCAC control module is used to temporarily shut down the AC discharge control circuit DCAC or temporarily limit the output power of the AC discharge control circuit DCAC based on the fault status of the AC discharge control circuit DCAC, the operating status of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance status of the low-voltage battery when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC are operating simultaneously.

[0029] Preferably, the DCAC control module includes:

[0030] Temporarily shut down the submodule for

[0031] When any of the following conditions is met, the AC discharge control circuit DCAC is temporarily shut down:

[0032] If the fault level of the AC discharge control circuit DCAC is the first preset fault level;

[0033] If the DC conversion control circuit DCDC is in the off state;

[0034] If the voltage of the low-voltage battery is less than or equal to the first preset voltage and has lasted for a first preset time period;

[0035] If the electrical balance status of the low-voltage battery shows that it is in a discharging state and the discharge current exceeds the preset current;

[0036] Temporarily restrict submodules for

[0037] When any of the following conditions is met, the output power of the AC discharge control circuit DCAC is temporarily limited:

[0038] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level;

[0039] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery indicates that the low-voltage battery is in a discharge state and the discharge current does not exceed the preset current;

[0040] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the electrical balance state of the low-voltage battery indicates that it is in a discharge state and the discharge current does not exceed the preset current;

[0041] The second preset fault level is lower than the first preset fault level.

[0042] Preferably, the vehicle-mounted high-voltage power distribution control device further includes:

[0043] A power gear detection module is used to reset the timer if it detects that the vehicle power gear has switched during the period when the AC discharge control circuit DCAC is temporarily shut down or the output power of the AC discharge control circuit DCAC is temporarily limited;

[0044] The DCAC output power recovery module is configured to restore the normal output power of the AC discharge control circuit DCAC after the reset timing is completed or after the timing is completed, if the fault state of the AC discharge control circuit DCAC, the operating state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance state of the low-voltage battery meet the normal operating conditions of the AC discharge control circuit DCAC.

[0045] On the other hand, the present application also provides a control device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the above-mentioned vehicle-mounted high-voltage power distribution control method are implemented.

[0046] On the other hand, the present application also provides a vehicle, comprising the above-mentioned on-board high-voltage power distribution control device.

[0047] The technical effects of the present invention are:

[0048] When the AC discharge control circuit DCAC and the DC conversion control circuit DCDC are operating simultaneously, if the low-voltage battery voltage and electrical balance status of the low-voltage battery indicate that the vehicle's low-voltage load demand exceeds the output capacity of the DC conversion function DCDC, or if the fault status of the AC discharge control circuit DCAC and the operating status of the DC conversion control circuit DCDC indicate that the AC discharge control circuit DCAC is not suitable for continued normal operation, the AC discharge control circuit DCAC can be temporarily shut down or its output power can be temporarily limited. This can not only replenish power for the low-voltage battery during this period, but also prevent the vehicle's low-voltage loads from being shut down, thereby ensuring the normal operation of the vehicle's key functions (such as lighting, instruments, control systems, etc.) and avoiding functional failures or safety hazards caused by insufficient low-voltage power supply.

[0049] In addition, by temporarily shutting down the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC, it is possible to avoid overloading the power supply system caused by the AC discharge control circuit DCAC and the DC conversion control circuit DCDC working simultaneously, thereby protecting the power supply system from damage and extending the life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 Schematic diagram of the process of the vehicle-mounted high-voltage power distribution control method in an embodiment of the present application;

[0051] Figure 2 Detailed flowchart of the vehicle-mounted high-voltage power distribution control method in an embodiment of the present application;

[0052] Figure 3 This is a structural block diagram of the vehicle-mounted high-voltage power distribution control system in an embodiment of the present application;

[0053] Figure 4 This is a structural block diagram of the vehicle-mounted high-voltage power distribution control device in an embodiment of the present application. DETAILED DESCRIPTION

[0054] For the convenience of those skilled in the art to understand, the patent of the present application is further described and explained below by the drawings. The description is more detailed, but it cannot be understood as limiting the scope of the patent of the present application, and the obvious modifications and substitutions of the following examples are all within the protection scope of the patent.

[0055] Since the AC discharge control circuit and the DC conversion control circuit share the high-voltage input end, when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC work at the same time, the rated output power of the DCDC will be reduced, and then the problem of function failure or safety hazard caused by the failure of the low-voltage load power supply of the whole vehicle will be caused. Therefore, the vehicle-mounted high-voltage power distribution control method provided in the embodiments of the present application does not need to change the hardware electrical design of the AC discharge control circuit and the DC conversion control circuit sharing the high-voltage input end, and still can keep the target of low cost of the vehicle-mounted high-voltage power distribution unit 3; and on this basis, the method can also guarantee the low-voltage load power supply of the whole vehicle when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC work at the same time, and avoid the function failure or safety hazard caused by the power failure of the low-voltage load of the whole vehicle.

[0056] Reference Figure 1 The vehicle-mounted high-voltage power distribution control method in the embodiments of the present application includes:

[0057] S1, when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC work at the same time, the fault state of the AC discharge control circuit DCAC, the working state of the DC conversion control circuit DCDC, the voltage of the low-voltage storage battery and the level balance state of the low-voltage storage battery are obtained;

[0058] S2, according to the fault state of the AC discharge control circuit DCAC, the working state of the DC conversion control circuit DCDC, the voltage of the low-voltage storage battery and the level balance state of the low-voltage storage battery, temporarily shutting down the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC.

[0059] The vehicle-mounted high-voltage power distribution control method described above is applied to Figure 3 The vehicle-mounted high-voltage power distribution control system, which includes a whole vehicle control unit 1, a high-voltage power distribution unit 3 and a low-voltage storage battery intelligent sensor 2, the whole vehicle control unit 1 and the high-voltage power distribution unit 3 are connected through a CAN bus, and the high-voltage power distribution unit 3 and the low-voltage storage battery intelligent sensor 2 are connected through a LIN bus.

[0060] The vehicle control unit 1 accurately identifies whether the user has a demand for using the DCAC function and whether the vehicle satisfies the external discharge condition in advance according to the vehicle power supply gear, the high-voltage system state, the power battery electric quantity, the available discharge power of the power battery, the function switch state of the DCAC, the connection state of the external discharge gun, and the connection state of the in-vehicle discharge socket appliance.

[0061] Specifically, the vehicle control unit 1 checks whether the function switch of the DCAC is turned on. If the function switch is turned on, it indicates that the user may have a demand for using the DCAC function. The vehicle control unit 1 checks whether the external discharge gun is connected. If the external discharge gun is connected, it indicates that the user may want to use the DCAC function through the external discharge gun. The vehicle control unit 1 checks whether the in-vehicle discharge socket has an appliance connected. If there is a connected appliance, it indicates that the user may want to use the DCAC function through the in-vehicle discharge socket. It is also necessary to confirm whether the vehicle power supply gear is in a state allowing discharge (such as the ON gear or the READY gear). The vehicle control unit 1 checks whether the high-voltage system is working normally and is in a dischargeable state. The vehicle control unit 1 confirms whether the power battery electric quantity is higher than a set discharge threshold (such as 20% or more) to ensure that there is sufficient electric quantity to support discharge. The vehicle control unit 1 checks whether the available discharge power of the power battery meets the demand of the DCAC function. If the available discharge power is insufficient, the vehicle cannot satisfy the external discharge condition.

[0062] Finally, if the DCAC function switch is turned on and the external discharge gun or the in-vehicle discharge socket has an appliance connected, it indicates that the user has a demand for using the DCAC function. If the vehicle power supply gear, the high-voltage system state, the power battery electric quantity, and the available discharge power all meet the corresponding conditions, the vehicle can discharge externally. If the user has a demand for using the DCAC function and the vehicle satisfies the external discharge condition, the vehicle control unit 1 sends a DCAC enable signal to the high-voltage power distribution unit 3. If any condition is not met, the vehicle control unit 1 should prohibit the DCAC function from starting and inform the user of the specific reason (such as insufficient electric quantity, high-voltage system abnormality, etc.) through a prompt.

[0063] After receiving the DCAC enable signal, the high-voltage power distribution unit 3 further judges whether the current vehicle state satisfies the DCAC start condition. If the DCAC start condition is satisfied, the alternating current discharge control circuit DCAC is started.

[0064] In the embodiment of the present application, the DCAC start condition is specifically that the fault level of the alternating current discharge control circuit DCAC is less than or equal to a second preset fault level, the working state of the direct current conversion control circuit DCDC is started, and the voltage of the low-voltage storage battery is greater than or equal to a second preset voltage. Among the various fault levels of the alternating current discharge control circuit DCAC: the third preset fault level < the second preset fault level < the first preset fault level, and the second preset voltage is a preset voltage representing sufficient electric quantity of the low-voltage storage battery, for example, 12.5 V.

[0065] Similarly, the vehicle control unit 1 will also determine whether to send a DCDC enable signal according to the existing logic, thereby selecting to turn on the DC conversion control circuit DCDC.

[0066] The vehicle control unit 1 is responsible for monitoring the vehicle power level, high-voltage system status, power battery charge, available power of the power battery, DCAC function switch status, external discharge gun connection status, and internal discharge socket electrical appliance connection status, accurately identifying whether the user has a need to use the DCAC function and whether the vehicle meets the external discharge conditions. If the judgment is "yes", the DCAC enable signal sent to the high-voltage distribution unit 3 via the CAN bus is "enabled", otherwise the DCAC enable signal sent is not "enabled".

[0067] The vehicle control unit 1 is responsible for monitoring the vehicle power level, high-voltage system status, power battery charge, available power of the power battery, DCAC function switch status, external discharge gun connection status, and internal discharge socket electrical appliance connection status, accurately identifying whether the user has a need to use the DCAC function and whether the vehicle meets the external discharge conditions. If the judgment is "yes", the DCAC enable signal sent to the high-voltage distribution unit 3 via the CAN bus is "enabled", otherwise the DCAC enable signal sent is not "enabled".

[0068] In the embodiment of the present application, the high-voltage power distribution unit 3 adopts an all-in-one technology approach, integrating the hardware circuits and control functions related to the AC charging control function OBC, the AC discharge control circuit DCAC, and the DC conversion control circuit DCDC. It is responsible for monitoring and controlling the operating status and fault conditions of the AC charging control function OBC, the operating status and fault conditions of the AC discharge control circuit DCAC, and the DC conversion control circuit DCDC. It is responsible for monitoring the input / output current, input / output voltage, and temperature of each control module, and is responsible for overload protection of each control module circuit. It is responsible for receiving the DCAC enable signal and vehicle power level signal sent by the vehicle control unit 1, and controlling the DCAC function to be turned on / off based on the monitored DCAC fault level, the DCDC operating status, the low-voltage battery voltage, and the low-voltage battery balance status.

[0069] When the AC discharge control circuit DCAC and the DC conversion control circuit DCDC are operating simultaneously, the high-voltage power distribution unit 3 monitors the fault status of the AC discharge control circuit DCAC, the working status of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance status of the low-voltage battery in real time.

[0070] By installing voltage and current sensors and fault diagnosis circuits in the AC discharge control circuit (DCAC), these sensors can collect parameters such as the DCAC's input and output voltages and currents in real time. The monitoring circuit analyzes these parameters and triggers a fault alarm when an anomaly (such as overvoltage, undervoltage, or overcurrent) occurs. For example, if the output voltage exceeds a set range, it is determined that the AC discharge control circuit (DCAC) has failed. Furthermore, based on the specific fault type, the fault status of the AC discharge control circuit (DCAC) is classified into three levels: a first preset fault level, a second preset fault level, and a third preset fault level, with the first preset fault level being the most severe and the third preset fault level being the least severe.

[0071] By installing voltage and current sensors at the input and output terminals of the DC converter control circuit (DCDC), the voltage and current during operation are monitored in real time. By detecting the output power of the DC converter control circuit (DCDC), it is determined whether it is in the high-efficiency range. If it is not in the high-efficiency range, the operating state of the DC converter control circuit (DCDC) is adjusted.

[0072] A high-precision low-voltage battery intelligent sensor 2 is installed on the low-voltage battery to collect the low-voltage battery voltage in real time. When the low-voltage battery voltage is less than or equal to a first preset voltage (a preset value indicating low battery charge, such as 12V) and remains so for at least a first preset duration, the low-voltage battery is discharging. This indicates that the output power of the DC converter control circuit (DCDC) cannot be used to charge the low-voltage battery and that the output power of the DC converter control circuit (DCDC) cannot meet the low-voltage load requirements of the vehicle.

[0073] During vehicle operation, the charging and discharging processes of the low-voltage battery need to achieve a dynamic balance to ensure that the low-voltage battery's power level can meet the vehicle's power needs while avoiding overcharging or over-discharging. In order to obtain the electrical balance of the low-voltage battery, a high-precision low-voltage battery intelligent sensor 2 is installed on the low-voltage battery circuit to collect the low-voltage battery's charging and discharging current in real time. The low-voltage battery intelligent sensor 2 can accurately measure the current value of the low-voltage battery at any time, including the charging current and the discharging current. The collected current data is integrated to determine the charge and discharge amount of the low-voltage battery within a certain time T1 (for example, 5 minutes). The integral calculation formula is:

[0074]

[0075] Where Q represents the total charge change during time T1 (in ampere-hours, Ah), and I(t) represents the current value at time t (in amperes, A). If the low-voltage battery's discharge capacity exceeds its charge capacity during time T1, that is, Q > 0 (the charge current is negative and the discharge current is positive), the low-voltage battery is considered to be in a discharge state.

[0076] Furthermore, when the low-voltage battery is in a discharging state, if it is identified that the discharge current of the low-voltage battery exceeds the preset current, it indicates that the low-voltage load demand at this time has seriously exceeded the output capacity of the DC conversion control circuit DCDC; conversely, if the discharge current of the low-voltage battery does not exceed the preset current, it indicates that the degree to which the low-voltage load demand exceeds the output capacity of the DC conversion control circuit DCDC is not high.

[0077] In the embodiment of the present application, step S2 specifically includes:

[0078] S21, when any of the following conditions is met, temporarily shut down the AC discharge control circuit DCAC:

[0079] If the fault level of the AC discharge control circuit DCAC is the first preset fault level;

[0080] If the DC conversion control circuit DCDC is in the off state;

[0081] If the voltage of the low-voltage battery is less than or equal to the first preset voltage and has lasted for a first preset time period;

[0082] If the electrical balance status of the low-voltage battery shows that it is in a discharging state and the discharge current exceeds the preset current;

[0083] S22: When any of the following conditions is met, the output power of the AC discharge control circuit DCAC is temporarily limited:

[0084] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level;

[0085] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery indicates that the low-voltage battery is in a discharge state and the discharge current does not exceed the preset current;

[0086] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the electrical balance state of the low-voltage battery shows that it is in a discharge state and the discharge current does not exceed the preset current; when the fault level of the AC discharge control circuit DCAC is the first preset fault level, since the first preset fault level is the most serious fault level of the AC discharge control circuit DCAC, it indicates that the AC discharge control circuit DCAC is no longer suitable for continuing to work at this time, and therefore, the AC discharge control circuit DCAC needs to be temporarily shut down.

[0087] When the DC converter control circuit (DCDC) is in the off state, the low-voltage battery becomes the sole energy source for the vehicle's low-voltage system. Since the DCAC function requires low-voltage power to support its control circuits and logic operations, continuing the AC discharge control circuit (DCAC) may accelerate the low-voltage battery's power consumption, causing over-discharge of the low-voltage battery, shortening its lifespan or even damaging it. Therefore, it is necessary to temporarily shut down the AC discharge control circuit (DCAC) when the DC converter control circuit (DCDC) is off.

[0088] According to the previous description, when the voltage of the low-voltage battery is less than or equal to the first preset voltage and has been maintained for at least the first preset time, it indicates that the low-voltage load demand of the entire vehicle has seriously exceeded the output capacity of the DC conversion control circuit DCDC. Therefore, it is also necessary to temporarily shut down the AC discharge control circuit DCAC to avoid the low-voltage load power supply of the entire vehicle being unable to meet the demand.

[0089] According to the above description, if it is identified that the discharge current of the low-voltage battery exceeds the preset current, it indicates that the low-voltage load demand has seriously exceeded the output capacity of the DC conversion control circuit DCDC, and it is necessary to temporarily shut down the AC discharge control circuit DCAC to avoid the low-voltage load power supply of the entire vehicle being unable to meet the demand.

[0090] When the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, and the fault level of the AC discharge control circuit DCAC is the second preset fault level, it indicates that the fault severity of the AC discharge control circuit DCAC has not yet reached a complete shutdown state. To prevent the external device from being completely powerless, the output power of the AC discharge control circuit DCAC can be temporarily limited to increase the rated output power of the DC conversion control circuit DCDC, thereby meeting the low-voltage load power supply requirements of the entire vehicle.

[0091] Similarly, if the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage and it is identified that the discharge current of the low-voltage battery does not exceed the preset current, it indicates that the severity of the low-voltage load demand exceeding the output capacity of the DC conversion control circuit DCDC is not high. In order to prevent the external device from being completely unable to obtain power, the output power of the AC discharge control circuit DCAC can be temporarily limited to increase the rated output power of the DC conversion control circuit DCDC, thereby meeting the low-voltage load power supply demand of the entire vehicle.

[0092] In the embodiment of the present application, temporarily shutting down the AC discharge control circuit DCAC means shutting down the AC discharge control circuit DCAC for a period of time. After the timing is up, whether to restore the normal output of the AC discharge control circuit DCAC will be selected according to actual conditions.

[0093] In an embodiment of the present application, if the output power of the AC discharge control circuit DCAC is temporarily limited, the specific implementation method for limiting the output power of the AC discharge control circuit DCAC is involved. To this end, this embodiment stipulates that: 1) if the voltage of the low-voltage battery is greater than a first preset voltage and less than a second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the electrical balance state of the low-voltage battery indicates that it is not discharging, the output power of the AC discharge control circuit DCAC is temporarily limited to the preset output power; 2) if the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery indicates that it is in a discharging state and the discharge current does not exceed a preset current; or if the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the electrical balance state of the low-voltage battery indicates that it is in a discharging state and the discharge current does not exceed a preset current, the output power of the AC discharge control circuit DCAC is temporarily limited based on the discharge current of the low-voltage battery.

[0094] In the second scenario, the output power of the low-voltage battery is determined by multiplying its discharge current by its current voltage. This output power is then used to limit the output power of the AC discharge control circuit DCAC. In other words, the output power of the AC discharge control circuit DCAC = the original output power of the AC discharge control circuit DCAC minus the output power of the low-voltage battery.

[0095] Reference Figure 2 In an embodiment of the present application, the vehicle-mounted high-voltage power distribution control method further includes:

[0096] S3: During the temporary shutdown or temporary power restriction of the AC discharge control circuit DCAC, if a vehicle power position switch is detected, the timer is reset. A vehicle power position switch refers to a change from "ON" to "OFF" or "OFF" to "ON." Resetting the timer means resetting the temporary shutdown duration or temporary power restriction duration from that point.

[0097] S4. After the reset timing is completed or the timing is completed, if the fault state of the AC discharge control circuit DCAC, the operating state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance state of the low-voltage battery meet the normal operating state of the AC discharge control circuit DCAC, the normal output power of the AC discharge control circuit DCAC is restored.

[0098] Among them, the normal working state of the AC discharge control circuit DCAC means that the fault level of the AC discharge control circuit DCAC is less than or equal to the second preset fault level, the working state of the DC conversion control circuit DCDC is on, and the voltage of the low-voltage battery is greater than or equal to the second preset voltage.

[0099] In the above-mentioned on-vehicle high-voltage power distribution control method in an embodiment of the present application, when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC are operating simultaneously, if the low-voltage battery voltage and the electrical balance status of the low-voltage battery indicate that the vehicle's low-voltage load demand exceeds the output capacity of the DC conversion function DCDC, or if the fault status of the AC discharge control circuit DCAC and the operating status of the DC conversion control circuit DCDC indicate that the AC discharge control circuit DCAC is not suitable for continued normal operation, the AC discharge control circuit DCAC is temporarily shut down or its output power is temporarily limited. This allows the low-voltage battery to be recharged during this period while preventing the vehicle's low-voltage loads from being shut down, thereby ensuring the normal operation of key vehicle functions (such as lighting, instruments, and control systems) and avoiding functional failures or safety hazards caused by insufficient low-voltage power supply.

[0100] In addition, by temporarily shutting down the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC, it is possible to avoid overloading the power supply system caused by the AC discharge control circuit DCAC and the DC conversion control circuit DCDC working simultaneously, thereby protecting the power supply system from damage and extending the life of the equipment.

[0101] Reference Figure 4 , an embodiment of the present application further provides a vehicle-mounted high-voltage power distribution control device, the vehicle-mounted high-voltage power distribution control device comprising:

[0102] The DCAC control module 101 is configured to temporarily shut down the AC discharge control circuit DCAC or temporarily limit the output power of the AC discharge control circuit DCAC based on a fault state of the AC discharge control circuit DCAC, an operating state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and an electrical balance state of the low-voltage battery when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC are operating simultaneously.

[0103] Preferably, the DCAC control module 101 includes:

[0104] Temporarily shut down submodule 1011, used to

[0105] When any of the following conditions is met, the AC discharge control circuit DCAC is temporarily shut down:

[0106] If the fault level of the AC discharge control circuit DCAC is the first preset fault level;

[0107] If the DC conversion control circuit DCDC is in the off state;

[0108] If the voltage of the low-voltage battery is less than or equal to the first preset voltage and has lasted for a first preset time period;

[0109] If the electrical balance status of the low-voltage battery shows that it is in a discharging state and the discharge current exceeds the preset current;

[0110] Temporary restriction submodule 1012, for

[0111] When any of the following conditions is met, the output power of the AC discharge control circuit DCAC is temporarily limited:

[0112] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level;

[0113] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery indicates that the low-voltage battery is in a discharge state and the discharge current does not exceed the preset current;

[0114] If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the electrical balance state of the low-voltage battery indicates that it is in a discharge state and the discharge current does not exceed the preset current;

[0115] The second preset fault level is lower than the first preset fault level.

[0116] Preferably, the vehicle-mounted high-voltage power distribution control device further includes:

[0117] The power gear detection module 102 is configured to reset the timer if it detects that the vehicle power gear has switched during the period when the AC discharge control circuit DCAC is temporarily shut down or the output power of the AC discharge control circuit DCAC is temporarily limited;

[0118] The DCAC output power recovery module 103 is configured to restore the normal output power of the AC discharge control circuit DCAC after the reset timer is completed or after the timer is completed, if the fault state of the AC discharge control circuit DCAC, the operating state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance state of the low-voltage battery meet the normal operating conditions of the AC discharge control circuit DCAC.

[0119] On the other hand, an embodiment of the present application also provides a control device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the above-mentioned vehicle-mounted high-voltage power distribution control method are implemented.

[0120] On the other hand, an embodiment of the present application further provides a vehicle, comprising the above-mentioned on-board high-voltage power distribution control device.

[0121] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0122] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0123] It should also be noted that, in this article, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or terminal device including the element.

[0124] The above describes the technical solutions provided by the present application in detail, and the principles and implementation modes of the present application are described by applying specific examples. The above example is only used to help understand the present application, and the content of the description should not be understood as limiting the present application. Meanwhile, for those skilled in the art, according to the present application, different forms of changes in specific implementation modes and application scope will be made, which do not need and cannot be exhausted here, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A vehicle-mounted high-voltage power distribution control method, characterized in that: The vehicle-mounted high-voltage power distribution control method includes: When the AC discharge control circuit DCAC and the DC conversion control circuit DCDC are operating simultaneously, the AC discharge control circuit DCAC is temporarily shut down or the output power of the AC discharge control circuit DCAC is temporarily limited according to the fault state of the AC discharge control circuit DCAC, the operating state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance state of the low-voltage battery; The steps of temporarily shutting down the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC according to the fault state of the AC discharge control circuit DCAC, the working state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance state of the low-voltage battery include: When any of the following conditions is met, the AC discharge control circuit DCAC is temporarily shut down: If the fault level of the AC discharge control circuit DCAC is the first preset fault level; If the DC conversion control circuit DCDC is in the off state; If the voltage of the low-voltage battery is less than or equal to the first preset voltage and has lasted for a first preset time period; If the electrical balance status of the low-voltage battery shows that it is in a discharging state and the discharge current exceeds the preset current; When any of the following conditions is met, the output power of the AC discharge control circuit DCAC is temporarily limited: If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level; If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery indicates that the low-voltage battery is in a discharge state and the discharge current does not exceed the preset current; If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the electrical balance state of the low-voltage battery indicates that it is in a discharge state and the discharge current does not exceed the preset current; The second preset fault level is lower than the first preset fault level; When any of the following conditions is met, the step of temporarily limiting the output power of the AC discharge control circuit DCAC includes: If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, and the electrical balance state of the low-voltage battery indicates that it is not discharging externally, the output power of the AC discharge control circuit DCAC is temporarily limited to the preset output power; If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery shows that it is in a discharging state and the discharge current does not exceed the preset current, or if the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level and the electrical balance state of the low-voltage battery shows that it is in a discharging state and the discharge current does not exceed the preset current, the output power of the AC discharge control circuit DCAC is temporarily limited according to the discharge current of the low-voltage battery.

2. The vehicle-mounted high-voltage power distribution control method according to claim 1, characterized in that: The vehicle-mounted high-voltage power distribution control method further includes: During the period of temporarily shutting down the AC discharge control circuit DCAC or temporarily limiting the output power of the AC discharge control circuit DCAC, if it is recognized that the vehicle power gear has been switched, the timer is reset; After the reset timing is completed or the timing is completed, if the fault state of the AC discharge control circuit DCAC, the working state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery and the electrical balance state of the low-voltage battery meet the normal working state of the AC discharge control circuit DCAC, the normal output power of the AC discharge control circuit DCAC is restored.

3. The vehicle-mounted high-voltage power distribution control method according to claim 2, characterized in that: The normal working state of the AC discharge control circuit DCAC refers to: The fault level of the AC discharge control circuit DCAC is less than or equal to the second preset fault level, the working state of the DC conversion control circuit DCDC is on, and the voltage of the low-voltage battery is greater than or equal to the second preset voltage.

4. A vehicle-mounted high-voltage power distribution control device, characterized in that: The vehicle-mounted high-voltage power distribution control device includes: The DCAC control module is configured to temporarily shut down the AC discharge control circuit DCAC or temporarily limit the output power of the AC discharge control circuit DCAC when the AC discharge control circuit DCAC and the DC conversion control circuit DCDC are operating simultaneously, based on the fault status of the AC discharge control circuit DCAC, the operating status of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance status of the low-voltage battery. The DCAC control module includes: The temporary shutdown submodule is used to temporarily shut down the AC discharge control circuit DCAC when any of the following conditions are met: If the fault level of the AC discharge control circuit DCAC is the first preset fault level; If the DC conversion control circuit DCDC is in the off state; If the voltage of the low-voltage battery is less than or equal to the first preset voltage and has lasted for a first preset time period; If the electrical balance status of the low-voltage battery shows that it is in a discharging state and the discharge current exceeds the preset current; The temporary limiting submodule is used to temporarily limit the output power of the AC discharge control circuit DCAC when any of the following conditions is met: If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level; If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the electrical balance state of the low-voltage battery indicates that the low-voltage battery is in a discharge state and the discharge current does not exceed the preset current; If the voltage of the low-voltage battery is greater than the first preset voltage and less than the second preset voltage, the fault level of the AC discharge control circuit DCAC is the second preset fault level, the electrical balance state of the low-voltage battery shows that it is in a discharging state and the discharge current does not exceed the preset current; the second preset fault level is lower than the first preset fault level.

5. The vehicle-mounted high-voltage power distribution control device according to claim 4, characterized in that: The vehicle-mounted high-voltage power distribution control device further includes: A power gear detection module is used to reset the timer if it detects that the vehicle power gear has switched during the period when the AC discharge control circuit DCAC is temporarily shut down or the output power of the AC discharge control circuit DCAC is temporarily limited; The DCAC output power recovery module is configured to restore the normal output power of the AC discharge control circuit DCAC after the reset timing is completed or after the timing is completed, if the fault state of the AC discharge control circuit DCAC, the operating state of the DC conversion control circuit DCDC, the voltage of the low-voltage battery, and the electrical balance state of the low-voltage battery meet the normal operating conditions of the AC discharge control circuit DCAC.

6. A control device, characterized in that: It includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein when the program or instruction is executed by the processor, the steps of the vehicle-mounted high-voltage power distribution control method according to any one of claims 1 to 3 are implemented.

7. A vehicle, characterized in that: It includes the vehicle-mounted high-voltage power distribution control device according to any one of claims 4-5.

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