Double-battery power supply method and system for commercial vehicle

Abstract

The invention discloses a double-battery power supply method and system for a commercial vehicle, and relates to the technical field of battery control, the double-battery power supply method for the commercial vehicle comprises the following steps: obtaining the power of a 48V load, a 24V load and a generator and the output current of the generator, and controlling a second switch to act according to the power of the 48V load, the 24V load and the generator and the output current of the generator, according to the electric quantity of the first 24V battery and the electric quantity of the second 24V battery, a first DCDC converter or a second DCDC converter is controlled to act, the electric quantity of the first 24V battery and the electric quantity of the second 24V battery are balanced, and the electric quantity difference between the first 24V battery and the second 24V battery is reduced through adjustment of the first DCDC converter and the second DCDC converter. The electric quantity balance of the first 24V battery and the second 24V battery is effectively ensured, and the battery utilization rate and the battery service life are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery control, and in particular to a dual-battery power supply method and system for a commercial vehicle. Background Art

[0002] With the development of science and technology, drivers have higher and higher requirements for the comfort of commercial vehicles. Many adaptive electrical equipment have been added, further increasing the power load of the whole vehicle. In order to meet the power demand of the high-power power load of the whole vehicle, the power of the high-power power load is increased from 24V to 48V. The 48V power supply supplies power to the high-power power load. In addition to supplying power to the 24V load, the 24V power supply also provides power for the ignition at startup. When the vehicle decelerates or coasts, the vehicle's kinetic energy is converted into electrical energy through the transmission system to the starter motor and recovered into the 48V battery.

[0003] In the prior art, two power supplies are used to supply power to the loads respectively. However, using two power supplies easily leads to a difference in the amount of electricity between the two power supply batteries, which seriously affects the battery utilization and battery life. Summary of the invention

[0004] The embodiment of the present invention provides a dual-battery power supply method and system for a commercial vehicle to solve the technical problem in the related art that the existing two power supplies easily lead to a difference in power between the two power supply batteries, which seriously affects the battery utilization and battery life.

[0005] In a first aspect, a dual-battery power supply method for a commercial vehicle is provided, comprising:

[0006] Obtain the power of 48V load, 24V load, generator and generator output current;

[0007] Controlling the action of the second switch according to the 48V load, the 24V load, the power of the generator and the output current of the generator;

[0008] The first DCDC converter or the second DCDC converter is controlled to operate according to the power of the first 24V battery and the power of the second 24V battery, so as to balance the power of the first 24V battery and the second 24V battery.

[0009] In some embodiments, controlling the second switch action according to the 48V load, the 24V load, the power of the generator and the output current of the generator includes:

[0010] If the 48V load power is not greater than the difference between the generator power and the 24V load power, the second switch is controlled to be disconnected.

[0011] In some embodiments, controlling the second switch action according to the 48V load, the 24V load, the power of the generator and the output current of the generator includes:

[0012] If the 48V load power is greater than the difference between the generator power and the 24V load power, it is determined whether the generator output current exceeds the preset current value;

[0013] If so, the second switch is controlled to be closed, and the second DCDC converter is controlled to operate according to the power of the first 24V battery and the power of the second 24V battery to balance the power of the first 24V battery and the second 24V battery.

[0014] In some embodiments, the controlling the second DCDC converter to operate according to the power of the first 24V battery and the power of the second 24V battery to balance the power of the first 24V battery and the second 24V battery includes:

[0015] Determine whether the difference between the power of the first 24V battery and the second 24V battery exceeds a first preset power value and whether the power of the first 24V battery exceeds a second preset power value;

[0016] If yes, controlling the second DCDC converter to act in a forward direction to adjust the current direction;

[0017] If not, determining whether the difference between the power of the first 24V battery and the second 24V battery exceeds a first preset power value and whether the power of the second 24V battery exceeds a third preset power value;

[0018] If so, the second DCDC converter is controlled to reversely adjust the current direction.

[0019] In some embodiments, if the 48V load power is greater than the difference between the generator power and the 24V load power, after determining whether the generator output current exceeds the preset current value, the following steps are performed:

[0020] If not, controlling the second switch to close, and determining whether the current flowing through the first switch is greater than zero;

[0021] If so, determining whether the power of the first 24V battery is less than the power of the second 24V battery;

[0022] If so, the output current of the first DCDC converter is reduced until the discharge current is zero; if not, the current output current of the first DCDC converter is maintained.

[0023] In some embodiments, if not, controlling the second switch to close and determining whether the current flowing through the first switch is greater than zero comprises:

[0024] If not, determining whether the current flowing through the first switch is zero;

[0025] If so, determining whether the power level of the first 24V battery is equal to the power level of the second 24V battery;

[0026] If so, maintaining the current output current of the first DCDC converter;

[0027] If not, determining whether the power of the first 24V battery is less than the power of the second 24V battery;

[0028] If so, controlling the output current of the first DCDC converter to decrease according to a first current value;

[0029] If not, determining whether the power of the first 24V battery is greater than the power of the second 24V battery;

[0030] If so, the output current of the first DCDC converter is controlled to increase according to a first current value.

[0031] In some embodiments, if not, after determining whether the current flowing through the first switch is zero, the method further comprises:

[0032] If not, determining whether the first switch charging current is less than the second switch discharging current;

[0033] If so, determining whether the power of the first 24V battery is greater than the power of the second 24V battery;

[0034] If so, the output current of the first DCDC converter is controlled to increase according to the first current value; if not, the current output current of the first DCDC converter is maintained.

[0035] In some embodiments, if not, after determining whether the first switch charging current is less than the second switch discharging current, the method includes:

[0036] If not, determining whether the first switch charging current is equal to the second switch discharging current;

[0037] If so, determining whether the power of the first 24V battery is greater than the power of the second 24V battery;

[0038] If so, the output current of the first DCDC converter is controlled to increase according to the second current value; if not, the current output current of the first DCDC converter is maintained.

[0039] In some embodiments, if not, after determining whether the first switch charging current is equal to the second switch discharging current, the method further comprises:

[0040] If not, determining whether the power of the first 24V battery is greater than the power of the second 24V battery;

[0041] If so, the output current of the first DCDC converter is controlled to increase according to a third current value; if not, the current output current of the first DCDC converter is maintained.

[0042] In a second aspect, a dual battery power supply system for a commercial vehicle includes a first 24V battery and a second 24V battery, and further includes:

[0043] A first switch, a second switch, a first DCDC converter, a second DCDC converter, a generator, a control device, a first 24V battery, the first switch, and a 24V load are connected in sequence, a first 24V battery, the second switch, a second 24V battery, and a 48V load are connected in sequence, the first DCDC converter is arranged between the first switch and the 48V load, the second DCDC converter is arranged between the first 24V battery and the second 24V battery, and the generator is connected to the 24V load and the first DCDC converter;

[0044] The control device is connected to the first switch, the second switch, the first DCDC converter, and the second DCDC converter, and is configured as follows:

[0045] Obtain the power of 48V load, 24V load, generator and generator output current;

[0046] Controlling the second switch action according to the 48V load, the 24V load, the power of the generator and the output current of the generator;

[0047] The first DCDC converter or the second DCDC converter is controlled to operate according to the power of the first 24V battery and the power of the second 24V battery, so as to balance the power of the first 24V battery and the second 24V battery.

[0048] The beneficial effects brought about by the technical solution provided by the present invention include:

[0049] An embodiment of the present invention provides a dual-battery power supply method and system for a commercial vehicle. The dual-battery power supply method for a commercial vehicle includes obtaining a 48V load, a 24V load, the power of a generator and the output current of the generator, controlling the action of a second switch according to the 48V load, the 24V load, the power of the generator and the output current of the generator, controlling the action of a first DCDC converter or a second DCDC converter according to the power of a first 24V battery and the power of a second 24V battery, balancing the power of the first 24V battery and the second 24V battery, adjusting the first DCDC converter and the second DCDC converter to reduce the power difference between the first 24V battery and the second 24V battery, effectively ensuring the power balance of the first 24V battery and the second 24V battery, and improving battery utilization and battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 A block diagram of a dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention;

[0052] Figure 2 A first judgment logic diagram of a dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention;

[0053] Figure 3 A second judgment logic diagram of a dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention;

[0054] Figure 4 A third judgment logic diagram of a dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention;

[0055] Figure 5 A fourth judgment logic diagram of a dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention;

[0056] Figure 6 A fifth judgment logic diagram of a dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention;

[0057] Figure 7 A sixth judgment logic diagram of a dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention;

[0058] Figure 8 A schematic structural diagram of a dual-battery power supply system for a commercial vehicle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0060] The embodiment of the present invention provides a dual-battery power supply method and system for a commercial vehicle, which can solve the technical problem in the related art that the two existing power supplies easily lead to a difference in power between the two power supply batteries, seriously affecting the battery utilization rate and battery life.

[0061] Figure 1 A dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention comprises the following steps:

[0062] Step S10, obtaining the power of the 48V load, the 24V load, the generator, and the generator output current;

[0063] Step S12, controlling the second switch action according to the 48V load, the 24V load, the generator power and the generator output current;

[0064] Step S30, controlling the operation of the first DCDC converter or the second DCDC converter according to the power of the first 24V battery and the power of the second 24V battery to balance the power of the first 24V battery and the power of the second 24V battery.

[0065] The dual-battery power supply method for a commercial vehicle provided by an embodiment of the present invention is obtained by sequentially connecting a first 24V battery, a first switch, and a 24V load, sequentially connecting a first 24V battery, a second switch, a second 24V battery, and a 48V load, a first DCDC converter provided between the first switch and the 48V load, a second DCDC converter provided between the first 24V battery and the second 24V battery, a generator connected to the 24V load and the first DCDC converter, and a control device connected to the first switch, the second switch, the first DCDC converter, and the second DCDC converter. Take the 48V load, the 24V load, the power of the generator and the output current of the generator, control the action of the second switch according to the 48V load, the 24V load, the power of the generator and the output current of the generator, control the action of the first DCDC converter or the second DCDC converter according to the power of the first 24V battery and the power of the second 24V battery, balance the power of the first 24V battery and the second 24V battery, reduce the power difference between the first 24V battery and the second 24V battery, effectively ensure the power balance between the first 24V battery and the second 24V battery, and improve battery utilization and battery life.

[0066] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the second switch action is controlled according to the 48V load, the 24V load, the power of the generator and the output current of the generator, including: if the 48V load power is not greater than the difference between the generator power and the 24V load power, the second switch is controlled to be disconnected, and the generator is controlled to supply power to the 48V load. The 48V load power is not greater than the generator power. At this time, the 48V load can be completely powered by the generator. The second switch is controlled to be disconnected, so that the first 24V battery and the second 24V battery are neither charged nor discharged to keep the power unchanged, and the 48V load is powered by the generator.

[0067] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the second switch action is controlled according to the 48V load, the 24V load, the power of the generator and the output current of the generator, including: if the 48V load power is greater than the difference between the generator power and the 24V load power, it is determined whether the generator output current exceeds the preset current value; if so, the second switch is controlled to be closed, and the second DCDC converter is controlled to act according to the first 24V battery power and the second 24V battery power, and the power of the first 24V battery and the second 24V battery are balanced. If the generator current exceeds the preset current value of 100A, the first DCDC converter has reached the maximum output power, and the output current of the first DCDC converter cannot be adjusted, that is, the first DCDC converter is not used for balancing, and the second switch is controlled to be closed and the second DCDC converter is acted, and the second DCDC converter is used for balancing, so that the second 24V battery is continuously discharged until the power is locked.

[0068] As an optional implementation, in an embodiment of the invention, see Figure 2 As shown, the control of the second DCDC converter action according to the power of the first 24V battery and the power of the second 24V battery to balance the power of the first 24V battery and the second 24V battery includes: judging whether the power difference between the first 24V battery and the second 24V battery exceeds a first preset power value and whether the power of the first 24V battery exceeds a second preset power value; if so, controlling the second DCDC converter action to forward adjust the current direction; if not, judging whether the power difference between the first 24V battery and the second 24V battery exceeds the first preset power value and whether the power of the second 24V battery exceeds a third preset power value; if so, controlling the second DCDC converter action to reversely adjust the current direction.

[0069] Specifically, if the generator current exceeds the preset current value of 100A, the second DCDC converter needs to be turned on for adjustment. At this time, if the difference between the first 24V battery and the second 24V battery exceeds the first preset power value, i.e., 20%, and the power of the first 24V battery exceeds the second preset power value, i.e., 40%, the second DCDC converter is turned on for internal power balancing, and the second DCDC converter is controlled to positively adjust the current direction so that the current of the first 24V battery flows to the second 24V battery; if the difference between the second 24V battery and the first 24V battery exceeds the first preset power value, i.e., 20%, and the power of the second 24V battery exceeds the third preset power value, i.e., 30%, the second DCDC converter is turned on for internal power balancing, and the second DCDC converter is controlled to reversely adjust the current direction so that the current of the second 24V battery flows to the first 24V battery; the second DCDC converter performs internal power balancing until the power of the second 24V battery is the same as that of the first 24V battery.

[0070] As an optional implementation, in an embodiment of the invention, see Figure 3 As shown, if the 48V load power is greater than the difference between the generator power and the 24V load power, after determining whether the generator output current exceeds the preset current value, the following steps are performed:

[0071] If not, control the second switch to close, and determine whether the current flowing through the first switch is greater than zero; if so, determine whether the power of the first 24V battery is less than the power of the second 24V battery; if so, reduce the output current of the first DCDC converter until the discharge current is zero; if not, maintain the current output current of the first DCDC converter.

[0072] Specifically, if the 48V load power is greater than the difference between the generator power and the 24V load power, and the generator output current does not exceed the preset current value of 100A, the first DCDC converter is used for adjustment to control the second switch to be closed. When the current flowing through the first switch is greater than zero, that is, the current direction of the first switch is a discharge current, the first 24V battery and the second 24V battery are both discharged, and the first 24V battery discharges faster than the second 24V battery. Then, the relationship between the power levels of the two batteries is determined. If the power level of the first 24V battery is less than the power level of the second 24V battery, the output current of the first DCDC converter is reduced, and the output current of the first DCDC converter is controlled to be reduced by a current value of 1A, that is, the discharge speed of the first 24V battery is reduced until the discharge current is zero. If the power level of the first 24V battery is not less than the power level of the second 24V battery, the first DCDC converter does not operate to maintain the current output current.

[0073] As an optional implementation, in an embodiment of the invention, see Figure 4 As shown, if not, controlling the second switch to close, and judging whether the current flowing through the first switch is greater than zero, includes: if not, judging whether the current flowing through the first switch is zero; if so, judging whether the power of the first 24V battery is equal to the power of the second 24V battery; if so, maintaining the current output current of the first DCDC converter; if not, judging whether the power of the first 24V battery is less than the power of the second 24V battery; if so, controlling the output current of the first DCDC converter to decrease according to the first current value; if not, judging whether the power of the first 24V battery is greater than the power of the second 24V battery; if so, controlling the output current of the first DCDC converter to increase according to the first current value.

[0074] Specifically, if the 48V load power is greater than the difference between the generator power and the 24V load power, the generator current does not exceed the preset current value of 100A, the current flowing through the first switch is not greater than zero, and the current flowing through the first switch is zero, then the first 24V battery and the second 24V battery are discharged at the same time, and then the relationship between the power levels of the first 24V battery and the second 24V battery is determined. If the power level of the first 24V battery is equal to the power level of the second 24V battery, the current output current of the first DCDC converter is maintained. If the power level of the first 24V battery is less than the power level of the second 24V battery, the output current of the first DCDC converter is controlled to be reduced by a first current value of 1A. If the power level of the first 24V battery is greater than the power level of the second 24V battery, the output current of the first DCDC converter is controlled to be increased by a first current value of 1A.

[0075] As an optional implementation, in an embodiment of the invention, see Figure 5 As shown, if not, after determining whether the current flowing through the first switch is zero, it includes: if not, determining whether the charging current of the first switch is less than the discharging current of the second switch; if so, determining whether the power of the first 24V battery is greater than the power of the second 24V battery; if so, controlling the output current of the first DCDC converter to increase according to the first current value; if not, maintaining the current output current of the first DCDC converter.

[0076] Specifically, if the 48V load power is greater than the difference between the generator power and the 24V load power, the generator current does not exceed the preset current value of 100A, the current flowing through the first switch is not greater than zero, and the current flowing through the first switch is not zero, then the current flowing through the first switch is less than zero, that is, the current direction of the first switch is the charging current, and then the magnitude relationship between the charging current of the first switch and the discharging current of the second switch is determined. If the charging current of the first switch is less than the discharging current of the second switch, both the first 24V battery and the second 24V battery are discharged and the discharge of the second 24V battery is faster than that of the first 24V battery. Then, it is determined that the power of the first 24V battery is greater than the power of the second 24V battery, and the output current of the first DCDC converter is controlled to increase according to the first current value of 1A to accelerate the discharge speed of the first 24V battery. If the power of the first 24V battery is not greater than the power of the second 24V battery, the current output current of the first DCDC converter is maintained unchanged.

[0077] As an optional implementation, in an embodiment of the invention, see Figure 6 As shown, if not, after judging whether the first switch charging current is less than the second switch discharging current, it includes: if not, judging whether the first switch charging current is equal to the second switch discharging current; if so, judging whether the power of the first 24V battery is greater than the power of the second 24V battery; if so, controlling the output current of the first DCDC converter to increase according to the second current value; if not, maintaining the current output current of the first DCDC converter.

[0078] Specifically, if the 48V load power is greater than the difference between the generator power and the 24V load power, the generator current does not exceed the preset current value of 100A, the current flowing through the first switch is not greater than zero, and the current flowing through the first switch is not zero, then the current flowing through the first switch is less than zero, that is, the current direction of the first switch is charging current, and the first switch charging current is not less than the second switch discharging current, and then determine whether the first switch charging current is equal to the second switch discharging current. If the first switch charging current is equal to the second switch discharging current, the second 24V battery continues to discharge, and the first 24V battery is neither charged nor discharged. If the power of the first 24V battery is greater than the power of the second 24V battery, the output current of the first DCDC converter is increased according to the second current value 2A. If the power of the first 24V battery is not greater than the power of the second 24V battery, the current output current of the first DCDC converter is maintained unchanged.

[0079] As an optional implementation, in an embodiment of the invention, see Figure 7As shown, if not, after determining whether the first switch charging current is equal to the second switch discharging current, it includes: if not, determining whether the power of the first 24V battery is greater than the power of the second 24V battery; if so, controlling the output current of the first DCDC converter to increase according to the third current value; if not, maintaining the current output current of the first DCDC converter.

[0080] Specifically, if the 48V load power is greater than the difference between the generator power and the 24V load power, the generator current does not exceed the preset current value of 100A, the current flowing through the first switch is not greater than zero, and the current flowing through the first switch is not zero, then the current flowing through the first switch is less than zero, that is, the current direction of the first switch is charging current, the first switch charging current is not less than the second switch discharging current, the first switch charging current is not equal to the second switch discharging current, then the first switch charging current is greater than the second switch discharging current, the second 24V battery continues to discharge, the first 24V battery is charged to a stable voltage, and then it is determined that the power of the first 24V battery is greater than the power of the second 24V battery, then the output current of the first DCDC converter is increased according to the third current value of 5A, if the power of the first 24V battery is not greater than the power of the second 24V battery, then the current output current of the first DCDC converter is maintained unchanged.

[0081] The present invention also provides a dual battery power supply system for a commercial vehicle. Figure 8 As shown, it includes a first 24V battery and a second 24V battery, and also includes:

[0082] A first switch, a second switch, a first DCDC converter, a second DCDC converter, a generator, and a control device. A first 24V battery, the first switch, and a 24V load are connected in sequence. A first 24V battery, the second switch, a second 24V battery, and a 48V load are connected in sequence. The first DCDC converter is arranged between the first switch and the 48V load, the second DCDC converter is arranged between the first 24V battery and the second 24V battery, and the generator is connected to the 24V load and the first DCDC converter. The control device is connected to the first switch, the second switch, the first DCDC converter, and the second DCDC converter, and is configured to: obtain the power of the 48V load, the 24V load, and the generator and the output current of the generator; control the action of the second switch according to the power of the 48V load, the 24V load, the generator, and the output current of the generator; control the action of the first DCDC converter or the second DCDC converter according to the power of the first 24V battery and the power of the second 24V battery, and balance the power of the first 24V battery and the second 24V battery.

[0083] Specifically, the first switch, the second switch, and the second DCDC converter can also be integrated into a battery management system, and a first shunt and a second shunt are also set in the battery management system, the first shunt is connected to the first 24V battery, the first shunt is used to obtain the current flowing through the first switch, the second shunt is connected to the second switch and the second 24V battery, the second shunt is used to obtain the current flowing through the second switch, the battery management system can also obtain the temperature and remaining power of the first 24V battery and the second 24V battery, the battery management system is connected to the first DCDC converter via CAN communication, and is used to obtain the input, output current and voltage signals of the first DCDC converter and control the on and off of the first DCDC converter, the on and off of the second switch, and the on and off of the second DCDC converter.

[0084] The dual-battery power supply system of the commercial vehicle of the embodiment of the present invention is adjusted by the first DCDC converter and the second DCDC converter to reduce the difference in power between the first 24V battery and the second 24V battery, thereby effectively ensuring the power balance between the first 24V battery and the second 24V battery and improving battery utilization and battery life.

[0085] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0086] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0087] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those 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 will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A dual battery power supply method for a commercial vehicle, characterized in that: The following steps are involved: Obtain the power of 48V load, 24V load, generator and generator output current; Controlling the action of the second switch according to the 48V load, the 24V load, the power of the generator and the output current of the generator; The first DCDC converter or the second DCDC converter is controlled to operate according to the power of the first 24V battery and the power of the second 24V battery, so as to balance the power of the first 24V battery and the second 24V battery.

2. The dual battery power supply method for commercial vehicles according to claim 1, characterized in that: The controlling the second switch action according to the 48V load, the 24V load, the power of the generator and the output current of the generator comprises: If the 48V load power is not greater than the difference between the generator power and the 24V load power, the second switch is controlled to be disconnected.

3. The dual battery power supply method for commercial vehicles according to claim 2, characterized in that: The controlling the second switch action according to the 48V load, the 24V load, the power of the generator and the output current of the generator comprises: If the 48V load power is greater than the difference between the generator power and the 24V load power, determine whether the generator output current exceeds the preset current value; If so, the second switch is controlled to be closed, and the second DCDC converter is controlled to operate according to the power of the first 24V battery and the power of the second 24V battery to balance the power of the first 24V battery and the second 24V battery.

4. The dual battery power supply method for commercial vehicles according to claim 3, characterized in that: The controlling the second DCDC converter to operate according to the power of the first 24V battery and the power of the second 24V battery to balance the power of the first 24V battery and the second 24V battery includes: Determine whether the difference between the power of the first 24V battery and the second 24V battery exceeds a first preset power value and whether the power of the first 24V battery exceeds a second preset power value; If yes, controlling the second DCDC converter to act in a forward direction to adjust the current direction; If not, determining whether the difference between the power of the first 24V battery and the second 24V battery exceeds a first preset power value and whether the power of the second 24V battery exceeds a third preset power value; If so, the second DCDC converter is controlled to reversely adjust the current direction.

5. The dual battery power supply method for commercial vehicles according to claim 3, characterized in that: If the 48V load power is greater than the difference between the generator power and the 24V load power, after determining whether the generator output current exceeds the preset current value, the method includes: If not, controlling the second switch to close, and determining whether the current flowing through the first switch is greater than zero; If so, determining whether the power of the first 24V battery is less than the power of the second 24V battery; If so, the output current of the first DCDC converter is reduced until the discharge current is zero; if not, the current output current of the first DCDC converter is maintained.

6. The dual battery power supply method for commercial vehicles according to claim 5, characterized in that: If not, controlling the second switch to close, and determining whether the current flowing through the first switch is greater than zero, comprising: If not, determining whether the current flowing through the first switch is zero; If so, determining whether the power level of the first 24V battery is equal to the power level of the second 24V battery; If so, maintaining the current output current of the first DCDC converter; If not, determining whether the power of the first 24V battery is less than the power of the second 24V battery; If so, controlling the output current of the first DCDC converter to decrease according to a first current value; If not, determining whether the power of the first 24V battery is greater than the power of the second 24V battery; If so, the output current of the first DCDC converter is controlled to increase according to a first current value.

7. The dual battery power supply method for commercial vehicles according to claim 6, characterized in that: If not, after determining whether the current flowing through the first switch is zero, the method further comprises: If not, determining whether the first switch charging current is less than the second switch discharging current; If so, determining whether the power of the first 24V battery is greater than the power of the second 24V battery; If so, the output current of the first DCDC converter is controlled to increase according to the first current value; if not, the current output current of the first DCDC converter is maintained.

8. The dual battery power supply method for commercial vehicles according to claim 7, characterized in that: If not, after determining whether the first switch charging current is less than the second switch discharging current, the method includes: If not, determining whether the first switch charging current is equal to the second switch discharging current; If so, determining whether the power of the first 24V battery is greater than the power of the second 24V battery; If so, the output current of the first DCDC converter is controlled to increase according to the second current value; if not, the current output current of the first DCDC converter is maintained.

9. The dual battery power supply method for commercial vehicles according to claim 8, characterized in that: If not, after determining whether the first switch charging current is equal to the second switch discharging current, the method includes: If not, determining whether the power of the first 24V battery is greater than the power of the second 24V battery; If so, the output current of the first DCDC converter is controlled to increase according to a third current value; if not, the current output current of the first DCDC converter is maintained.

10. A dual battery power supply system for a commercial vehicle, comprising a first 24V battery and a second 24V battery, characterized in that: Also includes: A first switch, a second switch, a first DCDC converter, a second DCDC converter, a generator, a control device, a first 24V battery, the first switch, and a 24V load are connected in sequence, a first 24V battery, the second switch, a second 24V battery, and a 48V load are connected in sequence, the first DCDC converter is arranged between the first switch and the 48V load, the second DCDC converter is arranged between the first 24V battery and the second 24V battery, and the generator is connected to the 24V load and the first DCDC converter; The control device is connected to the first switch, the second switch, the first DCDC converter, and the second DCDC converter, and is configured as follows: Obtain the power of 48V load, 24V load, generator and generator output current; Controlling the second switch action according to the 48V load, the 24V load, the power of the generator and the output current of the generator; The first DCDC converter or the second DCDC converter is controlled to operate according to the power of the first 24V battery and the power of the second 24V battery, so as to balance the power of the first 24V battery and the second 24V battery.

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