A control system, method and vehicle in voltage stabilization mode

Abstract

The present invention provides a control system, method and vehicle in a voltage stabilization mode, wherein the control system includes an HCU, a DC / DC and a BSG motor; when the HCU detects that the current vehicle status information meets the voltage stabilization mode conditions, it sends a voltage stabilization mode request to the DC / DC and the BSG motor; the DC / DC enters the voltage stabilization mode based on the voltage stabilization mode request, and increases the current sampling frequency of the DC / DC low-voltage end to send multiple powers to the BSG motor within a target time period; the BSG enters the voltage stabilization mode based on the voltage stabilization mode request, and calculates a target power change rate based on multiple powers; when the target power change rate is not greater than a preset power change rate, the BSG voltage of the BSG motor is controlled based on the target power change rate, so that the BSG voltage is maintained within the target voltage range to supply power to the vehicle normally.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and more particularly to a control system, method and vehicle thereof in a voltage stabilization mode. Background Art

[0002] With the continuous development of new energy technologies, electric vehicles are being used more and more widely. However, in extremely cold environments such as winter, or when the 48V battery fails, the battery of the electric vehicle does not have the ability to close the relay. That is, after the 48V battery of the electric vehicle is disconnected, the electric vehicle cannot start normally, that is, the electric vehicle cannot be powered and driven normally.

[0003] Therefore, how to provide a control method in voltage stabilization mode to ensure stable power supply to electric vehicles when the 48V battery of electric vehicles is disconnected and enable the electric vehicles to run normally is a problem that needs to be solved urgently. Summary of the Invention

[0004] In view of this, the present invention provides a control system, method and vehicle in a voltage stabilization mode, so as to ensure stable power supply to the electric vehicle and enable the electric vehicle to run normally when the 48V battery of the electric vehicle is disconnected.

[0005] A first aspect of the present invention provides a control system in a voltage stabilization mode, the control system comprising an HCU, a DC / DC and a BSG motor;

[0006] The HCU is configured to send a voltage stabilization mode request to the DC / DC and BSG motors when detecting that the current vehicle state information satisfies the voltage stabilization mode condition;

[0007] The DC / DC is configured to enter a voltage regulation mode based on the voltage regulation mode request and increase a current sampling frequency at a low voltage end of the DC / DC to deliver multiple powers to the BSG motor within a target time period;

[0008] The BSG is used to enter the voltage stabilization mode based on the voltage stabilization mode request, and calculate the target power change rate based on the multiple powers; when the target power change rate is not greater than the preset power change rate, the BSG voltage of the BSG motor is controlled based on the target power change rate, so that the BSG voltage is maintained within the target voltage range to normally power the vehicle.

[0009] Optionally, the HCU is further configured to:

[0010] Determining whether the current vehicle status information indicates a battery failure or a battery relay failure to close;

[0011] If the current vehicle status information indicates that a battery failure occurs, or the battery relay cannot be closed, it is determined that the current vehicle status information meets the voltage stabilization mode condition.

[0012] Optionally, the multiple powers are multiple powers sorted according to sampling time, and the BSG motor calculates a target power change rate based on the multiple powers, specifically for:

[0013] Multiple groups of power change rates are calculated based on the multiple powers, and target power change rates are determined based on the multiple groups of power change rates; wherein each group of power change rates is calculated based on two adjacent powers among the multiple powers.

[0014] Optionally, the BSG motor determines a target power change rate according to the multiple groups of power change rates, specifically for:

[0015] Determine whether each group of power change rates is not greater than a preset power change rate; if each group of power change rates is not greater than the preset power change rate, determine any one of the power change rates as the target power change rate.

[0016] Optionally, the BSG motor is also used for:

[0017] If any power change rate among the groups of power change rates is greater than the preset power change rate, an average power change rate of the power change rates of the groups is calculated, and the average power change rate is determined as the target power change rate.

[0018] Optionally, the HCU is further configured to:

[0019] A precharge request is sent to the DC / DC, so that the DC / DC performs precharge based on the precharge request; when it is detected that the DC / DC completes precharge, a voltage regulation mode request is sent to the DC / DC and the BSG motor.

[0020] Optionally, the BSG motor is also used for:

[0021] When the target power change rate is greater than the preset power change rate and the current working condition is a special working condition, the number of errors reported by the current BSG motor / DC / DC is increased by 1.

[0022] Optionally, the BSG motor is also used for:

[0023] Determine whether the number of error reports after adding 1 is greater than the preset number of error reports; if the number of error reports after adding 1 is not greater than the preset number of error reports, send an error re-request to the HCU, so that the HCU executes the step of sending a pre-charge request to the DC / DC based on the error re-request.

[0024] Optionally, the BSG motor is also used for:

[0025] If the number of error reports after adding 1 is greater than the preset number of error reports, the number of error reports after adding 1 will be reset and the corresponding battery fault information will be output.

[0026] A second aspect of the present invention provides a control method in a voltage stabilization mode, which is applied to a control system in the voltage stabilization mode, wherein the control system includes an HCU, a DC / DC, and a BSG motor. The method includes:

[0027] When the HCU detects that the current vehicle status information meets the voltage stabilization mode conditions, it sends a voltage stabilization mode request to the DC / DC and BSG motors;

[0028] The DC / DC enters a voltage regulation mode based on the voltage regulation mode request and increases a current sampling frequency at a low voltage end of the DC / DC to deliver multiple powers to the BSG motor within a target time period;

[0029] The BSG enters a voltage regulation mode based on the voltage regulation mode request, and calculates a target power change rate according to a plurality of the powers;

[0030] When the target power change rate is not greater than a preset power change rate, the BSG controls the BSG voltage of the BSG motor based on the target power change rate, so that the BSG voltage is maintained within a target voltage range to normally power the vehicle.

[0031] A third aspect of the present invention provides a vehicle, comprising the control system in the voltage stabilization mode of the first aspect.

[0032] The present invention provides a control system, method and vehicle in a voltage stabilization mode. The control system in the voltage stabilization mode includes: an HCU, a DC / DC and a BSG motor. When the HCU detects that current vehicle status information meets the voltage stabilization mode conditions, it sends a voltage stabilization mode request to the DC / DC and the BSG motor. When the DC / DC receives the voltage stabilization mode request, it enters the voltage stabilization mode based on the voltage stabilization mode request and increases the current sampling frequency of the DC / DC low-voltage end to send multiple powers to the BSG motor within a target time period. When the BSG receives the voltage stabilization mode request, it enters the voltage stabilization mode based on the voltage stabilization mode request and calculates a target power change rate based on the multiple powers sent by the DC / DC. When the target power change rate is not greater than a preset power change rate, the BSG voltage of the BSG motor is controlled based on the target power change rate to maintain the BSG voltage within a target voltage range, thereby ensuring stable output of the BSG voltage and providing stable power to the vehicle's 12V power consumption end. That is, when the vehicle's 48V battery is disconnected, the motor voltage stabilization function of the BSG motor is used to provide stable power to the vehicle's 12V power consumption end, thereby achieving stable power supply to the vehicle and ensuring normal driving of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0034] Figure 1 This is an example diagram of the method of adjusting the vehicle voltage stabilization function provided by the existing technology;

[0035] Figure 2 A schematic structural diagram of a control system in a voltage stabilization mode provided by an embodiment of the present invention;

[0036] Figure 3 A diagram showing the connection structure of a DC / DC and a BSG motor provided by an embodiment of the present invention;

[0037] Figure 4 A flow chart of a control method in a voltage stabilization mode provided by an embodiment of the present invention;

[0038] Figure 5 This is an example diagram of a control method in a voltage stabilization mode provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] As used herein, the term "including" and its variations are open-ended, i.e., "including but not limited to." The term "based on" means "based, at least in part, on." The term "one embodiment" means "at least one embodiment," the term "another embodiment" means "at least one additional embodiment," and the term "some embodiments" means "at least some embodiments." Other terms are defined in the following description.

[0041] It should be noted that the concepts of "first" and "second" mentioned in the disclosure of the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0042] It should be noted that the modifications of "one" and "multiple" mentioned in the disclosure of the present invention are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0043] From the above background technology, it can be seen that in extremely cold environments such as winter, or when the 48V battery fails, the battery of the electric vehicle does not have the ability to close the relay. That is, after the 48V battery of the electric vehicle is disconnected, the electric vehicle cannot start normally, that is, the electric vehicle cannot be powered and driven normally.

[0044] In the existing technology, the voltage stabilization function of the vehicle can be used to adjust the voltage, such as Figure 1 The voltage generation function of the BSG motor is used to supply normal power to the vehicle's 12V power consumption end, thereby achieving normal power supply to the vehicle and ensuring normal driving of the vehicle. However, during the debugging of the vehicle's voltage stabilization function, the BSG motor may not be able to stabilize the voltage under the vehicle's rapid acceleration / deceleration conditions, causing DC load dumping and high-voltage end voltage rise, thereby causing the BSG motor to overvoltage and unable to supply normal 12V power, resulting in the electric vehicle being unable to power itself and drive normally.

[0045] Therefore, the present invention provides a control system, method and vehicle in a voltage stabilization mode. In the voltage stabilization mode, the DC / DC increases the current sampling frequency of the DC / DC low-voltage end to speed up the speed of sending multiple powers to the BSG motor, so that the BSG can quickly calculate the target power change rate based on multiple powers in the voltage stabilization mode, and when the target power change rate is not greater than the preset power change rate, the BSG voltage of the BSG motor is controlled based on the target power change rate to maintain the BSG voltage within the target voltage range, ensuring stable output of the BSG voltage and stable power supply to the vehicle's 12V power end. That is to say, when the vehicle's 48V battery is disconnected, the motor voltage stabilization function of the BSG motor is used to stably supply power to the vehicle's 12V power end, thereby achieving stable power supply to the vehicle and ensuring normal driving of the vehicle.

[0046] See also Figure 2 , shows a control system in a voltage stabilization mode provided by an embodiment of the present invention, the control system in the voltage stabilization mode includes a hybrid control unit (HCU), a DC / DC and a belt starter generator (BSG).

[0047] The HCU is used to send a voltage regulation mode request to the DC / DC and BSG motor when it detects that the current vehicle status information meets the voltage regulation mode conditions.

[0048] Optionally, the HCU may determine whether the current vehicle status information indicates a battery failure or a battery relay cannot be closed; if the current vehicle status information indicates a battery failure or a battery relay cannot be closed, it is determined that the current vehicle status information meets the voltage stabilization mode conditions.

[0049] In an embodiment of the present application, the HCU can detect in real time whether the 48V battery on the vehicle is faulty or whether the battery relay can be closed normally; when the HCU detects that the 48V battery on the vehicle is faulty or the battery relay cannot be closed normally, it can send a voltage regulation mode request to the DC / DC and BSG motors respectively, so that the DC / DC and BSG motors enter the voltage regulation mode based on the voltage regulation mode request.

[0050] Optionally, before sending voltage regulation mode requests to the DC / DC and BSG motor respectively, the HCU may also send a pre-charge request to the DC / DC, so that the DC / DC performs pre-charge based on the pre-charge request, and when it detects that the DC / DC completes pre-charging, it sends voltage regulation mode requests to the DC / DC and BSG motor respectively, so that the DC / DC and BSG motor enter the voltage regulation mode based on the voltage regulation mode request.

[0051] It should be noted that by sending a pre-charge request to the DC / DC, the DC / DC is pre-charged based on the pre-charge request, thereby avoiding damage to the DC / DC and BSG motor in subsequent processing, thereby affecting the service life of the DC / DC and BSG motor.

[0052] The DC / DC is used to enter the voltage regulation mode based on the voltage regulation mode request and increase the DC / DC low-voltage side current sampling frequency to send multiple powers to the BSG motor within the target time period.

[0053] See also Figure 3 , shows a connection structure diagram of a DC / DC and a BSG motor provided by an embodiment of the present invention, where the first end of the DC / DC is grounded, the second end of the DC / DC is connected to the first end of the 12V battery, the second end of the 12V battery is grounded, the third end of the DC / DC is connected to the first 48VGND end of the 48V battery, the fourth end of the DC / DC is connected to the first 48VNetwork end of the 48V battery, the first end of the BSG motor is connected to the second 48VGND end of the 48V battery, and the second end of the BSG motor is connected to the second 48VNetwork end of the 48V battery.

[0054] In an embodiment of the present application, when the DC / DC receives a voltage regulation mode request sent by the HCU, it can enter the voltage regulation mode based on the voltage regulation mode request, so that in the voltage regulation mode, the current sampling frequency of the low-voltage end of the DC / DC can be increased to send multiple powers to the BSG motor within the target time period.

[0055] It should be noted that the DC / DC low voltage end may be a 12 V low voltage end. The target time period may be 1 ms, 2 ms, etc., and may be set according to actual applications, and is not limited in the present embodiment.

[0056] Optionally, the target current sampling frequency can be pre-set. After the DC / DC enters the voltage regulation mode, the current current sampling frequency of the DC / DC low voltage end can be increased to the target current sampling frequency to send multiple powers to the BSG motor within the target time period.

[0057] In the embodiment of the present application, the multiple powers are multiple powers sorted by sampling time, wherein the multiple powers can be 5, 10, 15, etc., which can be collected according to actual application and are not limited in the embodiment of the present application.

[0058] It should be noted that the target current sampling frequency can be pre-set to 0.6A / 0.2ms. For example, if the current sampling frequency of the DC / DC low-voltage end is 0.6A / 10ms, after the DC / DC enters the voltage regulation mode, the current sampling frequency of the DC / DC low-voltage end can be increased from 0.6A / 10ms to 0.6A / 0.2ms to increase the current sampling frequency of the DC / DC low-voltage end, thereby increasing the power sampling frequency of the DC / DC low-voltage end, that is, increasing the speed of sending power to the BSG motor.

[0059] BSG is used to enter the voltage regulation mode based on the voltage regulation mode request and calculate the target power change rate based on multiple powers; when the target power change rate is not greater than the preset power change rate, the BSG voltage of the BSG motor is controlled based on the target power change rate to maintain the BSG voltage within the target voltage range to power the vehicle normally.

[0060] In the embodiment of the present application, a preset power change rate can be pre-set, and a corresponding target voltage range can be pre-set. The target voltage range can be 44V-2 to 44V+2. The target voltage range can be set according to actual application and is not limited in the embodiment of the present application.

[0061] It should be noted that the preset power change rate can be set based on the historical power change rate that caused the BSG motor overvoltage and the voltage at the time of the BSG motor overvoltage. For example, the preset power change rate can be set to be greater than the power change rate currently set in the BSG motor. The preset power change rate can be set according to actual application and is not limited in the embodiments of the present application.

[0062] After receiving the voltage regulation mode request sent by the HCU, the BSG motor can enter the voltage regulation mode based on the voltage regulation mode request; in the voltage regulation mode, when receiving multiple powers sent by the DC / DC, the target power change rate can be determined based on the multiple powers received, and it can be judged whether the determined target power change rate is greater than the preset power change rate; when it is determined that the target power change rate is not greater than the preset power change rate, it can be considered that adjusting the BSG voltage of the BSG motor according to the target power change rate can ensure that the BSG voltage of the BSG motor is maintained within the target voltage range, thereby avoiding overvoltage of the BSG motor.

[0063] When it is determined that the target power change rate is greater than the preset power change rate, it can be considered that if the target power change rate is used to adjust the BSG voltage of the BSG motor at this time, the BSG motor may be overvoltage. Therefore, the corresponding fault information can be output to prompt the user to take corresponding measures in time.

[0064] Optionally, when receiving multiple powers, the BSG motor can calculate multiple groups of power change rates based on the multiple powers, and determine the target power change rate based on the multiple groups of power change rates; wherein each group of power change rates is calculated based on two adjacent powers among the multiple powers.

[0065] As a preferred method of an embodiment of the present application, the process of determining the target power change rate of the BSG motor based on multiple groups of power change rates can be: judging whether the power change rates of each group are not greater than the preset power change rate; if the power change rates of each group are not greater than the preset power change rate, determining any one of the power change rates in each group as the target power change rate; if any one of the power change rates in each group is greater than the preset power change rate, calculating the average power change rate of each group of power change rates, and determining the average power change rate as the target power change rate.

[0066] For example, there are four multiple powers, namely power 1, power 2, power 3 and power 4; when the BSG motor receives multiple powers, it can take power 1 and power 2 as a group of powers, power 2 and power 3 as a group of powers, and power 3 and power 4 as a group of powers, so as to calculate the power change rate corresponding to the group of powers according to power 1 and power 2, calculate the power change rate corresponding to the group of powers according to power 2 and power 3, and calculate the power change rate corresponding to the group of powers according to power 3 and power 4, and obtain three groups of power change rates.

[0067] Determine whether there is a power change rate greater than the preset power change rate among the three groups of power change rates. If not, any one of the three groups of power change rates can be used as the target power change rate, and the BSG voltage of the BSG motor can be controlled based on the target power change rate to maintain the BSG voltage within the target voltage range to provide normal power supply for the vehicle.

[0068] If there is a power change rate greater than the preset power change rate among the three groups of power change rates, the average power change rate of each group of power change rates can be calculated, and the average power change rate can be determined as the target power change rate. Based on the target power change rate, the BSG voltage of the BSG motor is controlled to maintain the BSG voltage within the target voltage range to power the vehicle normally.

[0069] Furthermore, in an embodiment of the present application, a preset number of error reports can be pre-set, that is, when the vehicle is in a special working condition, the number of restarts is increased inside the BSG motor, and when the number of error reports of the BSG motor / DC / DC is not greater than the preset number of error reports, a restart is performed, that is, an error re-request is sent to the HCU, so that the HCU executes a pre-charge request to the DC / DC based on the error re-request feedback, and when it is detected that the DC / DC has completed pre-charging, executes a voltage regulation mode request to the DC / DC and the BSG motor to re-generate BSG voltage, thereby ensuring normal power supply for the vehicle under special working conditions and ensuring normal driving of the vehicle.

[0070] It should be noted that the special operating condition may be a sudden overload condition at the low-voltage end of the vehicle. Special operating conditions may be set according to actual applications and are not limited in the present embodiment.

[0071] Optionally, when the target power change rate is greater than the preset power change rate, it can be further determined whether the current operating condition of the vehicle is a special operating condition; if it is determined that the current operating condition is a special operating condition, the number of error reports of the current BSG motor / DC / DC is increased by 1, and it is determined whether the number of error reports after increasing by 1 is greater than the preset number of error reports; if the number of error reports after increasing by 1 is not greater than the preset number of error reports, an error re-request is sent to the HCU, so that the HCU executes a pre-charge request to the DC / DC based on the error re-request feedback, and when it detects that the DC / DC has completed pre-charging, executes a voltage regulation mode request to the DC / DC and the BSG motor to resume BSG voltage generation.

[0072] If the number of error reports after adding 1 is greater than the preset number of error reports, the number of error reports after adding 1 will be reset and the corresponding battery fault information will be output.

[0073] It should be noted that if the current working condition is not a special working condition, the corresponding fault information can be directly output to prompt the user to perform corresponding processing in a timely manner.

[0074] It should also be noted that the preset number of error reports can be 5 times, 6 times, 7 times, etc., which can be set according to actual applications and is not limited in the embodiments of this application.

[0075] The present invention provides a control system in a voltage stabilization mode, which includes an HCU, a DC / DC and a BSG motor; when the HCU detects that current vehicle status information meets the voltage stabilization mode conditions, it sends a voltage stabilization mode request to the DC / DC and the BSG motor; when the DC / DC receives the voltage stabilization mode request, it enters the voltage stabilization mode based on the voltage stabilization mode request, and increases the current sampling frequency of the DC / DC low-voltage end to send multiple powers to the BSG motor within a target time period; when the BSG receives the voltage stabilization mode request, it enters the voltage stabilization mode based on the voltage stabilization mode request, and calculates a target power change rate based on the multiple powers sent by the DC / DC; when the target power change rate is not greater than a preset power change rate, the BSG voltage of the BSG motor is controlled based on the target power change rate, so that the BSG voltage is maintained within a target voltage range, ensuring stable output of the BSG voltage and stable power supply to the vehicle's 12V power consumption end. That is, when the vehicle's 48V battery is disconnected, the motor voltage stabilization function of the BSG motor is used to stably supply power to the vehicle's 12V power consumption end, thereby achieving stable power supply to the vehicle and ensuring normal driving of the vehicle.

[0076] Based on the control system in the voltage stabilization mode provided by the above embodiment of the present invention, correspondingly, the embodiment of the present invention provides a control method in the voltage stabilization mode, such as Figure 4 As shown, the method is applied to a control system in a voltage stabilization mode, and the method specifically includes the following:

[0077] S401: When the HCU detects that the current vehicle status information meets the voltage stabilization mode conditions, it sends a voltage stabilization mode request to the DC / DC and BSG motors.

[0078] Optionally, the HCU may determine whether the current vehicle status information indicates a battery failure or a battery relay cannot be closed; if the current vehicle status information indicates a battery failure or a battery relay cannot be closed, it is determined that the current vehicle status information meets the voltage stabilization mode conditions.

[0079] In an embodiment of the present application, the HCU can detect in real time whether the 48V battery on the vehicle is faulty or whether the battery relay can be closed normally; when the HCU detects that the 48V battery on the vehicle is faulty or the battery relay cannot be closed normally, it can send a voltage regulation mode request to the DC / DC and BSG motors respectively, so that the DC / DC and BSG motors enter the voltage regulation mode based on the voltage regulation mode request.

[0080] Optionally, before sending voltage regulation mode requests to the DC / DC and BSG motor respectively, the HCU may also send a pre-charge request to the DC / DC, so that the DC / DC performs pre-charge based on the pre-charge request, and when it detects that the DC / DC completes pre-charging, it sends voltage regulation mode requests to the DC / DC and BSG motor respectively, so that the DC / DC and BSG motor enter the voltage regulation mode based on the voltage regulation mode request.

[0081] S402: The DC / DC enters the voltage regulation mode based on the voltage regulation mode request, and increases the DC / DC low-voltage end current sampling frequency to send multiple powers to the BSG motor within the target time period.

[0082] In an embodiment of the present application, when the DC / DC receives a voltage regulation mode request sent by the HCU, it can enter the voltage regulation mode based on the voltage regulation mode request, so that in the voltage regulation mode, the current sampling frequency of the low-voltage end of the DC / DC can be increased to send multiple powers to the BSG motor within the target time period.

[0083] It should be noted that the DC / DC low voltage end may be a 12 V low voltage end. The target time period may be 1 ms, 2 ms, etc., and may be set according to actual applications, and is not limited in the present embodiment.

[0084] Optionally, the target current sampling frequency can be pre-set. After the DC / DC enters the voltage regulation mode, the current current sampling frequency of the DC / DC low voltage end can be increased to the target current sampling frequency to send multiple powers to the BSG motor within the target time period.

[0085] In the embodiment of the present application, the multiple powers are multiple powers sorted by sampling time, wherein the multiple powers can be 5, 10, 15, etc., which can be collected according to actual application and are not limited in the embodiment of the present application.

[0086] It should be noted that the target current sampling frequency can be pre-set to 0.6A / 0.2ms. For example, if the current sampling frequency of the DC / DC low-voltage end is 0.6A / 10ms, after the DC / DC enters the voltage regulation mode, the current sampling frequency of the DC / DC low-voltage end can be increased from 0.6A / 10ms to 0.6A / 0.2ms to increase the current sampling frequency of the DC / DC low-voltage end, thereby increasing the power sampling frequency of the DC / DC low-voltage end, that is, increasing the speed of sending power to the BSG motor.

[0087] S403: The BSG enters the voltage regulation mode based on the voltage regulation mode request, and calculates a target power change rate according to the multiple powers.

[0088] In an embodiment of the present application, after receiving the voltage stabilization mode request sent by the HCU, the BSG motor can enter the voltage stabilization mode based on the voltage stabilization mode request; in the voltage stabilization mode, when receiving multiple powers sent by the DC / DC, the target power change rate can be determined based on the multiple powers received.

[0089] Optionally, when receiving multiple powers, the BSG motor can calculate multiple groups of power change rates based on the multiple powers, and determine the target power change rate based on the multiple groups of power change rates; wherein each group of power change rates is calculated based on two adjacent powers among the multiple powers.

[0090] As a preferred method of an embodiment of the present application, the process of determining the target power change rate of the BSG motor based on multiple groups of power change rates can be: judging whether the power change rates of each group are not greater than the preset power change rate; if the power change rates of each group are not greater than the preset power change rate, determining any one of the power change rates in each group as the target power change rate; if any one of the power change rates in each group is greater than the preset power change rate, calculating the average power change rate of each group of power change rates, and determining the average power change rate as the target power change rate.

[0091] S404: The BSG determines whether the target power change rate is greater than a preset power change rate; if the target power change rate is not greater than the preset power change rate, step S405 is executed.

[0092] S405: The BSG motor controls the BSG voltage of the BSG motor based on the target power change rate, so that the BSG voltage is maintained within the target voltage range to normally power the vehicle.

[0093] In the embodiment of the present application, a preset power change rate can be pre-set, and a corresponding target voltage range can be pre-set. The target voltage range can be 44V-2 to 44V+2. The target voltage range can be set according to actual application and is not limited in the embodiment of the present application.

[0094] It should be noted that the preset power change rate can be set based on the historical power change rate that caused the BSG motor overvoltage and the voltage at the time of the BSG motor overvoltage. For example, the preset power change rate can be set to be greater than the power change rate currently set in the BSG motor. The preset power change rate can be set according to actual application and is not limited in the embodiments of the present application.

[0095] After receiving the voltage regulation mode request sent by the HCU, the BSG motor can enter the voltage regulation mode based on the voltage regulation mode request; in the voltage regulation mode, when receiving multiple powers sent by the DC / DC, the target power change rate can be determined based on the multiple powers received, and it can be judged whether the determined target power change rate is greater than the preset power change rate; when it is determined that the target power change rate is not greater than the preset power change rate, it can be considered that adjusting the BSG voltage of the BSG motor according to the target power change rate can ensure that the BSG voltage of the BSG motor is maintained within the target voltage range, thereby avoiding overvoltage of the BSG motor.

[0096] When it is determined that the target power change rate is greater than the preset power change rate, it can be considered that if the target power change rate is used to adjust the BSG voltage of the BSG motor at this time, the BSG motor may be overvoltage. Therefore, the corresponding fault information can be output to prompt the user to take corresponding measures in time.

[0097] Furthermore, in an embodiment of the present application, a preset number of error reports can be pre-set, that is, when the vehicle is in a special working condition, the number of restarts is increased inside the BSG motor, and when the number of error reports of the BSG motor is not greater than the preset number of error reports, a restart is performed, that is, an error re-request is sent to the HCU, so that the HCU executes a pre-charge request to the DC / DC based on the error re-request feedback, and when it is detected that the DC / DC has completed the pre-charge, executes a voltage regulation mode request to the DC / DC and the BSG motor to re-generate the BSG voltage, thereby ensuring normal power supply to the vehicle under special working conditions and ensuring normal driving of the vehicle.

[0098] It should be noted that the special operating condition may be a sudden overload condition at the low-voltage end of the vehicle. Special operating conditions may be set according to actual applications and are not limited in the present embodiment.

[0099] Optionally, when the target power change rate is greater than the preset power change rate, it can be further determined whether the current operating condition of the vehicle is a special operating condition; if it is determined that the current operating condition is a special operating condition, the number of error reports of the current BSG motor / DC / DC is increased by 1, and it is determined whether the number of error reports after increasing by 1 is greater than the preset number of error reports; if the number of error reports after increasing by 1 is not greater than the preset number of error reports, an error re-request is sent to the HCU, so that the HCU executes a pre-charge request to the DC / DC based on the error re-request feedback, and when it detects that the DC / DC has completed pre-charging, executes a voltage regulation mode request to the DC / DC and the BSG motor to resume BSG voltage generation.

[0100] If the number of error reports after adding 1 is greater than the preset number of error reports, the number of error reports after adding 1 will be reset and the corresponding battery fault information will be output.

[0101] The present invention provides a control method in a voltage stabilization mode, which is applied to a control system in the voltage stabilization mode, the system comprising an HCU, a DC / DC and a BSG motor; when the HCU detects that current vehicle status information meets the voltage stabilization mode conditions, it sends a voltage stabilization mode request to the DC / DC and the BSG motor; when the DC / DC receives the voltage stabilization mode request, it enters the voltage stabilization mode based on the voltage stabilization mode request and increases the current sampling frequency of the DC / DC low-voltage end to send multiple powers to the BSG motor within a target time period; when the BSG receives the voltage stabilization mode request, it enters the voltage stabilization mode based on the voltage stabilization mode request and calculates a target power change rate based on the multiple powers sent by the DC / DC; when the target power change rate is not greater than a preset power change rate, the BSG voltage of the BSG motor is controlled based on the target power change rate, so that the BSG voltage is maintained within a target voltage range, ensuring stable output of the BSG voltage and stable power supply to the vehicle's 12V power consumption end. That is, when the vehicle's 48V battery is disconnected, the motor voltage stabilization function of the BSG motor is used to stably supply power to the vehicle's 12V power consumption end, thereby achieving stable power supply to the vehicle and ensuring normal driving of the vehicle.

[0102] In order to better understand this application, the following is explained by way of examples. Figure 5 shown.

[0103] See also Figure 5 , the preset number of error reports can be 5 times, the target current sampling frequency can be 0.6A / 0.2ms, and the target voltage range can be 44V-2~44V+2; the HCU can detect in real time whether the 48V battery on the vehicle is faulty, or whether the battery relay can be closed normally; when the HCU detects that the 48V battery on the vehicle is faulty, or the battery relay cannot be closed normally, it sends a pre-charge request to the DC / DC to enable the DC / DC to pre-charge based on the pre-charge request, and when it is detected that the DC / DC has completed pre-charging, it sends a voltage regulation mode request to the DC / DC and BSG motor respectively, so that the DC / DC and BSG motor enter the voltage regulation mode based on the voltage regulation mode request.

[0104] After the DC / DC enters the voltage regulation mode, the current sampling frequency of the DC / DC low-voltage end can be increased from 0.6A / 10ms to 0.6A / 0.2ms to send multiple powers to the BSG motor within the target time period.

[0105] In the voltage regulation mode, when the BSG motor receives multiple powers sent by the DC / DC, it can determine the target power change rate based on the multiple powers received, and judge whether the determined target power change rate is greater than the preset power change rate; when it is determined that the target power change rate is not greater than the preset power change rate, it can be considered that the BSG voltage of the BSG motor is adjusted according to the target power change rate to maintain the BSG voltage within 44V-2~44V+2 to provide normal power supply for the vehicle.

[0106] When it is determined that the target power change rate is greater than the preset power change rate and the current operating condition is a special operating condition, the number of errors of the current BSG motor / DC / DC is increased by 1, and it is determined whether the number of errors after increasing by 1 is greater than 5; if the number of errors after increasing by 1 is not greater than 5, an error re-request is sent to the HCU, so that the HCU executes a pre-charge request to the DC / DC based on the error re-request feedback, and when it is detected that the DC / DC has completed pre-charging, a voltage regulation mode request is sent to the DC / DC and the BSG motor to resume BSG voltage generation.

[0107] An embodiment of the present invention provides a vehicle, which includes the control system in the voltage stabilization mode in the above embodiment.

[0108] An embodiment of the present invention also provides an electronic device, comprising: a processor and a memory, the processor and the memory being connected via a communication bus; wherein the processor is used to call and execute a program stored in the memory; the memory is used to store a program, and the program is used to implement the control method in the voltage stabilization mode provided in the above method embodiment.

[0109] Preferably, an embodiment of the present invention further provides a computer-readable storage medium, in which computer-executable instructions are stored. The computer-executable instructions are used to execute the control method in the voltage stabilization mode provided in the above method embodiment.

[0110] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple. For relevant parts, refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without making any creative efforts.

[0111] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0112] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0113] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control system in voltage stabilization mode, characterized in that: The control system includes HCU, DC / DC and BSG motor; The HCU is configured to send a voltage stabilization mode request to the DC / DC and BSG motors when detecting that the current vehicle state information satisfies the voltage stabilization mode condition; The DC / DC is configured to enter a voltage regulation mode based on the voltage regulation mode request and increase a sampling frequency of a current at a low voltage end of the DC / DC to send multiple power levels to the BSG motor within a target time period; wherein the multiple power levels are multiple power levels sorted by sampling time; The BSG is configured to enter a voltage regulated mode based on the voltage regulated mode request and calculate a target power change rate based on the plurality of powers; and when the target power change rate is not greater than a preset power change rate, control a BSG voltage of the BSG motor based on the target power change rate so that the BSG voltage is maintained within a target voltage range to normally power the vehicle; The BSG motor calculates a target power change rate based on the multiple powers, specifically for: Calculating multiple groups of power change rates based on the multiple powers, and determining whether the power change rates of each group are not greater than a preset power change rate; If the power change rates of each group are not greater than the preset power change rate, determining any one of the power change rates of each group as the target power change rate; If any power change rate among the groups of power change rates is greater than the preset power change rate, an average power change rate of the power change rates of the groups is calculated, and the average power change rate is determined as the target power change rate.

2. The system according to claim 1, wherein: The HCU is also used to: Determining whether the current vehicle status information indicates a battery failure or a battery relay failure to close; If the current vehicle status information indicates that a battery failure occurs, or the battery relay cannot be closed, it is determined that the current vehicle status information meets the voltage stabilization mode condition.

3. The system according to claim 1, wherein: The HCU is also used to: A precharge request is sent to the DC / DC, so that the DC / DC performs precharge based on the precharge request; when it is detected that the DC / DC completes precharge, a voltage regulation mode request is sent to the DC / DC and the BSG motor.

4. The system according to claim 3, characterized in that The BSG motor is also used for: When the target power change rate is greater than the preset power change rate and the current working condition is a special working condition, the number of errors reported by the current BSG motor / DC / DC is increased by 1.

5. The system according to claim 4, characterized in that The BSG motor is also used for: Determine whether the number of error reports after adding 1 is greater than the preset number of error reports; if the number of error reports after adding 1 is not greater than the preset number of error reports, send an error re-request to the HCU, so that the HCU executes the step of sending a pre-charge request to the DC / DC based on the error re-request.

6. The system according to claim 5, characterized in that The BSG motor is also used for: If the number of error reports after adding 1 is greater than the preset number of error reports, the number of error reports after adding 1 is reset and corresponding battery fault information is output.

7. A control method in voltage stabilization mode, characterized in that: A control system applied to a voltage stabilization mode includes an HCU, a DC / DC converter, and a BSG motor. The method includes: When the HCU detects that the current vehicle status information meets the voltage stabilization mode conditions, it sends a voltage stabilization mode request to the DC / DC and BSG motors; The DC / DC enters a voltage regulation mode based on the voltage regulation mode request and increases a sampling frequency of a current at a low voltage end of the DC / DC to send multiple powers to the BSG motor within a target time period; wherein the multiple powers are multiple powers sorted according to sampling time; The BSG enters a voltage regulation mode based on the voltage regulation mode request, and calculates a target power change rate based on the multiple powers; wherein the BSG motor calculates the target power change rate based on the multiple powers, including: calculating multiple groups of power change rates based on the multiple powers, and determining whether the power change rates of each group are not greater than a preset power change rate; if the power change rates of each group are not greater than the preset power change rate, determining any one of the power change rates of each group as the target power change rate; if any one of the power change rates of each group is greater than the preset power change rate, calculating an average power change rate of each group of power change rates, and determining the average power change rate as the target power change rate; When the target power change rate is not greater than a preset power change rate, the BSG controls the BSG voltage of the BSG motor based on the target power change rate, so that the BSG voltage is maintained within a target voltage range to normally power the vehicle.

8. A vehicle, characterized in that: The invention comprises a control system in voltage stabilization mode as described in any one of claims 1 to 6.

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