Control method for a drive system, drive system and vehicle

Abstract

The application provides a control method of a driving system, a driving system and a vehicle. The control method of the driving system comprises the following steps: when one of a first battery pack and a second battery pack is faulty, controlling a second electronic control unit to receive a voltage provided by a non-faulty battery pack; wherein the non-faulty battery pack is the battery pack which is not faulty among the first battery pack and the second battery pack; controlling the second electronic control unit to boost the voltage provided by the non-faulty battery pack into a preset voltage and provide the preset voltage to at least one of n first electronic control units; and controlling the at least one first electronic control unit to drive a corresponding motor to operate according to the preset voltage. The control method provided by the application can improve the reliability of the driving system and the safety of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle control, in particular to a control method of a driving system, a driving system and a vehicle. BACKGROUND

[0002] In the high-voltage system of an electric vehicle, a battery pack is generally composed of multiple single cells in series and parallel to provide power for the vehicle. If the battery pack causes an abnormality resulting in a voltage that does not reach the normal working voltage of the electric control, the electric control recognizes that the voltage does not reach the set working voltage value, an under-voltage fault occurs, the high-voltage load loses power supply and cannot work, thereby causing the vehicle to break down. However, if only a single cell has an over-temperature, over-voltage, over-discharge, low-temperature or other fault, the entire battery pack will also report a fault, thereby causing the vehicle to suddenly lose power and exist a great safety hazard. Moreover, if a single cell fails at a location far from an automobile after-sales store, a tow truck cannot provide rescue in a short time, which will bring a poor experience to the customer. SUMMARY

[0003] To solve the above technical problems or at least partially solve the above technical problems, the present application provides a control method of a driving system, a driving system and a vehicle.

[0004] To achieve the above purpose, a first aspect of the present application provides a control method of a driving system, the control method of the driving system comprising:

[0005] When a fault occurs in one of the first battery pack and the second battery pack, controlling the second electric control unit to receive a voltage provided by a non-faulty battery pack; wherein the non-faulty battery pack is the battery pack that does not have a fault in the first battery pack and the second battery pack;

[0006] Controlling the second electric control unit to step up the voltage provided by the non-faulty battery pack to a preset voltage and provide the voltage to at least one of the n first electric control units; and

[0007] Controlling at least one of the first electric control units to drive a corresponding motor to operate according to the preset voltage;

[0008] The driving system comprises:

[0009] a power battery comprising a first battery pack and a second battery pack, a negative electrode of the first battery pack being electrically connected to a positive electrode of the second battery pack;

[0010] n first electric control units; wherein n is an integer and n≥1; and

[0011] a second electric control unit.

[0012] The control method of the driving system provided in the application can control the second electric control unit to receive the voltage provided by the non-faulty battery pack when one of the first battery pack and the second battery pack fails, and control the second electric control unit to boost the voltage provided by the non-faulty battery pack to a preset voltage, so that at least one of the n first electric control units can operate normally. In this way, the problem that the vehicle suddenly loses power due to the failure of a single battery cell can be avoided, the reliability of the driving system can be improved, and the safety of the vehicle can be improved.

[0013] In some embodiments, the control of the second electric control unit to receive the voltage provided by the non-faulty battery pack comprises:

[0014] controlling the first switch to be turned on, so that the second electric control unit receives the voltage provided by the non-faulty battery pack;

[0015] The second electric control unit comprises a motor and a first switch, the first end of the first switch is electrically connected to the motor in the second electric control unit, and the second end of the first switch is electrically connected to the negative electrode of the first battery pack and the positive electrode of the second battery pack.

[0016] In some embodiments, before the control of the second electric control unit to receive the voltage provided by the non-faulty battery pack, the control method of the driving system further comprises:

[0017] controlling the second switch in the non-faulty battery pack to be turned on and the second switch in the faulty battery pack to be turned off when one of the first battery pack and the second battery pack fails;

[0018] The first battery pack and the second battery pack each comprise a single battery cell and a second switch, and the single battery cell and the second switch are connected in series.

[0019] In some embodiments, the control of the second electric control unit to boost the voltage provided by the non-faulty battery pack to a preset voltage and provide the voltage to at least one of the n first electric control units comprises:

[0020] According to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, the upper tube and the lower tube of the target bridge arm in the second electric control unit are controlled to be turned on alternately at a preset frequency, so that the target bridge arm in the second electric control unit and the target winding form a boost circuit to boost the voltage provided by the non-faulty battery pack to a preset voltage and provide the voltage to at least one of the n first electric control units;

[0021] The second electric control unit comprises a motor and an inverter, the inverter comprises at least one bridge arm connected in parallel between the positive electrode of the first battery pack and the negative electrode of the second battery pack, the bridge arm comprises an upper tube, a lower tube and a midpoint, and at least one phase winding of the motor is electrically connected to the midpoint of at least one bridge arm in the inverter in one-to-one correspondence; the target bridge arm is at least one bridge arm of the inverter of the second electric control unit, and the target winding is a winding in the motor of the second electric control unit which is electrically connected to the target bridge arm.

[0022] In some embodiments, the control of the upper tube and the lower tube of the target bridge arm in the second electric control unit to alternately conduct according to a preset frequency according to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack comprises:

[0023] According to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, a target duty cycle is derived;

[0024] According to the target duty cycle, a first control signal and a second control signal with a preset frequency are generated; wherein the duty cycle of the first control signal is the target duty cycle, and the second control signal is opposite to the first control signal; and

[0025] According to the fault conditions of the first battery pack and the second battery pack, the first control signal is output to the upper tube of the target bridge arm in the second electric control unit, and the second control signal is output to the lower tube of the target bridge arm in the second electric control unit, or the second control signal is output to the upper tube of the target bridge arm in the second electric control unit, and the first control signal is output to the lower tube of the target bridge arm in the second electric control unit, so as to control the upper tube and the lower tube of the target bridge arm in the second electric control unit to alternately conduct according to a preset frequency.

[0026] In some embodiments, the derivation of the target duty cycle according to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack comprises:

[0027] According to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, the target duty cycle is calculated according to a preset duty cycle calculation formula; wherein the preset duty cycle calculation formula is D1=Ub / (Ua+Ub), D1 is the target duty cycle, Ua is the rated voltage of the non-faulty battery pack, and Ub is the rated voltage of the faulty battery pack.

[0028] In some embodiments, the method further comprises:

[0029] when the first battery pack fails, outputting the second control signal to the upper tube of the target bridge arm in the second electric control unit and outputting the first control signal to the lower tube of the target bridge arm in the second electric control unit, so as to control the upper tube and the lower tube of the target bridge arm in the second electric control unit to alternately conduct at a preset frequency; and

[0030] when the second battery pack fails, outputting the first control signal to the upper tube of the target bridge arm in the second electric control unit and outputting the second control signal to the lower tube of the target bridge arm in the second electric control unit, so as to control the upper tube and the lower tube of the target bridge arm in the second electric control unit to alternately conduct at a preset frequency.

[0031] In some embodiments, the method further comprises:

[0032] obtaining state information of the single battery cell; and

[0033] determining that one of the first battery pack and the second battery pack fails according to the state information of the single battery cell.

[0034] The second aspect of the present application further provides a driving system, which comprises:

[0035] a power battery, comprising a first battery pack and a second battery pack, a negative electrode of the first battery pack being electrically connected with a positive electrode of the second battery pack;

[0036] n first electric control units; wherein n is an integer, n≥1;

[0037] a second electric control unit; and

[0038] a controller, electrically connected with the n first electric control units and the second electric control unit, and configured to execute the control method of the driving system according to the first aspect.

[0039] The third aspect of the present application further provides a vehicle, which comprises:

[0040] a vehicle body; and

[0041] The driving system according to the second aspect; wherein the driving system is arranged in the vehicle body.

[0042] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a topological schematic diagram of a driving system provided by an embodiment of the present application;

[0044] Figure 2 is a circuit structure schematic diagram of the driving system shown in Figure 1

[0045] Figure 3 is a flowchart of a control method of the driving system provided by an embodiment of the present application;

[0046] Figure 4 is a current flow schematic diagram of the driving system shown in Figure 2

[0047] Figure 5 is another current flow schematic diagram of the driving system shown in Figure 2

[0048] Figure 6 is a topological structure schematic diagram of a vehicle provided by an embodiment of the present application.

[0049] The following is a description of the reference signs:

[0050] Driving system 100

[0051] Power battery 1

[0052] First battery pack 11

[0053] Second battery pack 12

[0054] First electronic control unit 3

[0055] Second electronic control unit 2

[0056] Direct current charging port 4

[0057] Inverter 21

[0058] Alternating current port 212

[0059] Direct current port 211

[0060] Motor 22

[0061] First switch K1

[0062] ​​​Second switch K2

[0063] Third switch K3

[0064] Fourth switch K4

[0065] Upper tube T1, T2, T3

[0066] Lower tube T4, T5, T6

[0067] A-phase winding WA

[0068] B-phase winding WB

[0069] C-phase winding WC

[0070] Capacitor C1, C2

[0071] Vehicle 1000

[0072] Vehicle body 200

[0073] The following detailed description will illustrate the present application in connection with the above-mentioned drawings. DETAILED DESCRIPTION

[0074] The technical solutions in the embodiments of the present application will be clearly and completely described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0075] In addition, the terms "first", "second", and the like in the specification of the present application are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0076] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0077] Please refer to Figures 1-2 , Figure 1 is a topological schematic diagram of a driving system provided by the embodiments of the present application, Figure 2 is Figure 1The circuit structure diagram of the drive system is shown in FIG.

[0078] like Figures 1-2 As shown, the drive system 100 includes a power battery 1, n first electronic control units 3 and a second electronic control unit 2. Where n≥1, Figures 1-2 In the illustrated embodiment, the drive system 100 is described with n=1. In other embodiments, n may also be other values, such as 2, 3, 4, etc.

[0079] The power battery 1 includes a first battery pack 11 and a second battery pack 12 , and the negative electrode of the first battery pack 11 is electrically connected to the positive electrode of the second battery pack 12 .

[0080] Each of the first electronic control unit 3 and the second electronic control unit 2 includes an inverter 21 and a motor 22. The inverter 21 includes an AC port 212 and a DC port 211. The DC port 211 is electrically connected to the positive electrode of the first battery pack 11 and the negative electrode of the second battery pack 12, and the AC port 212 is electrically connected to the corresponding motor 22. The neutral point of the motor 22 in the second electronic control unit 2 is electrically connected to the negative electrode of the first battery pack 11 and the positive electrode of the second battery pack 12.

[0081] The AC port 212 is electrically connected to the corresponding motor 22 , which means that the AC port 212 is electrically connected to the motor 22 in the electronic control unit.

[0082] Exemplarily, each of the first battery group 11 and the second battery group 12 may include one or more battery packs, wherein each battery pack may include at least one single battery cell.

[0083] For example, the motor 22 includes a drive motor or an air-conditioning compressor. The motor 22 can be a single-phase motor or a multi-phase motor, for example Figure 2 Three-phase motor shown.

[0084] Under normal circumstances, both the first battery pack 11 and the second battery pack 12 are fault-free. The first battery pack 11 and the second battery pack 12 are connected in series and provide an electronic control working voltage to the n first electronic control units 3 and the second electronic control unit 2. In this way, any one of the n first electronic control units 3 and the second electronic control unit 2 can operate based on the electronic control working voltage provided by the power battery 1. Specifically, when a certain electronic control unit is operating, the inverter 21 in the electronic control unit receives the electronic control working voltage provided by the power battery 1 through the DC port 211, and inverts the electronic control working voltage into an AC voltage, and provides the AC voltage to the motor 22 in the electronic control unit through the AC port 212 to drive the motor 22 to operate.

[0085] However, when one single cell in the power battery 1 appears over-temperature, over-voltage, over-discharge, low-temperature and other faults, so that the power battery 1 cannot provide the electric control working voltage, each electric control unit will detect that the received voltage cannot reach the electric control working voltage and appear an under-voltage fault, so as to stop working. Thus, the vehicle will be stranded and lose power suddenly, which exists a great safety hazard. Moreover, if a single cell fault occurs in a place far away from a car after-sales store, a tow truck cannot provide rescue in a short time, which will bring a poor experience to the customer.

[0086] Therefore, the present application provides a control method of a driving system, please refer to Figure 3 , Figure 3 is a flow chart of the control method of the driving system provided by the embodiments of the present application, and the control method is applied to the driving system 100 described above.

[0087] As Figure 3 shown, the control method of the driving system includes steps S1-S3, which are specifically as follows:

[0088] Step S1, when a fault occurs in one of the first battery pack 11 and the second battery pack 12, controlling the second electric control unit 2 to receive the voltage provided by the non-fault battery pack.

[0089] Among them, the non-fault battery pack is the battery pack that has not occurred a fault in the first battery pack 11 and the second battery pack 12.

[0090] Step S2, controlling the second electric control unit 2 to boost the voltage provided by the non-fault battery pack into a preset voltage, and providing the preset voltage to at least one of the n first electric control units 3.

[0091] Step S3, controlling at least one of the first electric control units 3 to drive the corresponding motor 22 to operate according to the preset voltage.

[0092] Among them, the voltage value of the preset voltage is equal to or close to the voltage value of the electric control working voltage, so that the n first electric control units 3 will not appear an under-voltage fault when receiving the preset voltage and can operate normally.

[0093] The control method of the driving system provided in the application controls the second electric control unit 2 to receive the voltage provided by the non-faulty battery pack when one of the first battery pack 11 and the second battery pack 12 is faulty, and controls the second electric control unit 2 to perform a voltage boosting function to boost the voltage provided by the non-faulty battery pack to a preset voltage, so that at least one of the n first electric control units 3 can operate normally. In this way, the problem that the vehicle suddenly loses power due to the failure of a single cell can be avoided, the reliability of the driving system 100 can be improved, and the safety of the vehicle can be improved.

[0094] As shown in Figure 2 some embodiments, the second electric control unit 2 further includes a first switch K1, a first end of the first switch K1 is electrically connected to the neutral point of the motor 22 in the second electric control unit 2, and a second end of the first switch K1 is electrically connected to the negative electrode of the first battery pack 11 and the positive electrode of the second battery pack 12.

[0095] The control method of the driving system further includes:

[0096] controlling the first switch K1 to conduct, so that the second electric control unit 2 receives the voltage provided by the non-faulty battery pack.

[0097] In this way, when the first battery pack 11 and the second battery pack 12 are both fault-free, the first switch K1 can be controlled to disconnect the electrical connection between the neutral point of the motor 22 in the second electric control unit 2 and the power battery 1, so that the second electric control unit 2 can perform an inverter function to invert the operating voltage provided by the power battery 1 into alternating current to drive the motor 22 to operate; when one of the first battery pack 11 and the second battery pack 12 is faulty, the first switch K1 can be controlled to conduct the electrical connection between the neutral point of the motor 22 in the second electric control unit 2 and the power battery 1, so that the second electric control unit 2 can perform a voltage boosting function, thereby realizing the multiplexing of the second electric control unit 2.

[0098] In some embodiments, the first battery pack 11 and the second battery pack 12 each include a single cell and a second switch K2, and the single cell is connected in series with the second switch K2.

[0099] Before the control method controls the second electric control unit 2 to receive the voltage provided by the non-faulty battery pack through the neutral point of the motor 22, the control method of the driving system further includes:

[0100] When one of the first battery pack 11 and the second battery pack 12 is faulty, the second switch K2 in the non-faulty battery pack is controlled to conduct, and the second switch K2 in the faulty battery pack is controlled to disconnect.

[0101] In this way, the faulty battery pack can be reliably cut off by the second switch K2, so as to avoid short circuit failure.

[0102] In some embodiments, each of the first control units 3 and the second control unit 2 further comprises a capacitor C1 electrically connected to the DC port 211 of the inverter 21 in the control unit. The capacitor C1 is configured to stabilize the voltage received by the DC port 211 of the control unit.

[0103] In other embodiments, the second control unit 2 and the n first control units 3 can share a bus capacitor with a large capacitance value, and there is no need to provide a capacitor C1 for each control unit.

[0104] In some embodiments, the inverter 21 comprises at least one bridge arm connected in parallel between the positive electrode of the first battery pack 11 and the negative electrode of the second battery pack 12. Each bridge arm comprises an upper tube, a lower tube and a midpoint. The first bus of the upper tube of the at least one bridge arm and the second bus of the lower tube of the at least one bridge arm constitute the DC port 211, and the midpoint of the at least one bridge arm constitutes the AC port 212. At least one phase winding of the motor 22 is electrically connected to the midpoint of the corresponding at least one bridge arm of the inverter 21.

[0105] The control of the second control unit 2 to step up the voltage provided by the non-faulty battery pack to a preset voltage and provide it to at least one of the n first control units 3 comprises:

[0106] According to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, the upper tube and the lower tube of the target bridge arm in the second control unit 2 are controlled to be alternately turned on at a preset frequency, so that the target bridge arm in the second control unit 2 and the target winding form a step-up circuit to step up the voltage provided by the non-faulty battery pack to a preset voltage, and provide the preset voltage to at least one of the n first control units 3 through the DC port 211.

[0107] The target bridge arm is at least one bridge arm of the inverter 21 of the second control unit 2, and the target winding is a winding in the motor 22 of the second control unit 2 electrically connected to the target bridge arm.

[0108] For example, the preset frequency is between 5KHz and 20KHz.

[0109] For example, as Figure 2As shown, the inverter 21 includes three bridge arms, i.e., a first bridge arm, a second bridge arm, and a third bridge arm, wherein the first bridge arm includes the upper tube T1 and the lower tube T4, the second bridge arm includes the upper tube T2 and the lower tube T5, and the third bridge arm includes the upper tube T3 and the lower tube T6, and the motor 22 includes an A-phase winding WA, a B-phase winding WB, and a C-phase winding WC.

[0110] The first connection end of the upper tube T1, the first connection end of the upper tube T2, and the first connection end of the upper tube T3 are connected together to form a first bus end, the second connection end of the upper tube T1 and the first connection end of the lower tube T4 are electrically connected to form a midpoint of the first bridge arm, the second connection end of the upper tube T2 and the first connection end of the lower tube T5 are electrically connected to form a midpoint of the second bridge arm, the second connection end of the upper tube T3 and the first connection end of the lower tube T6 are electrically connected to form a midpoint of the third bridge arm, the second connection end of the lower tube T4, the second connection end of the lower tube T5, and the second connection end of the lower tube T6 are connected together to form a second bus end, the first bus end and the second bus end form the direct current port 211, and the midpoints of the first bridge arm, the second bridge arm, and the third bridge arm form the alternating current port 212. One end of the A-phase winding WA is electrically connected to the midpoint of the first bridge arm, one end of the B-phase winding WB is electrically connected to the midpoint of the second bridge arm, one end of the C-phase winding WC is electrically connected to the midpoint of the second bridge arm, and the other ends of the A-phase winding WA, the B-phase winding WB, and the C-phase winding WC are connected together to form a neutral point of the motor 22.

[0111] Exemplarily, in some embodiments, the switching tubes (including the upper tube T1 to the lower tube T6) in the inverter 21 all adopt metal oxide semiconductor field effect transistors (MOSFETs), for example, NMOS, of course, in other embodiments, one or more of various types of switching tubes such as relays, bipolar junction transistors (BJTs), insulated gate bipolar transistors (IGBTs), etc. can also be used, and the embodiments of the present application will not be enumerated one by one.

[0112] In the embodiments of the present application, the target bridge arm can be any one of the first bridge arm, the second bridge arm and the third bridge arm, any two bridge arms or all the three bridge arms, for example, in some embodiments, the target bridge arm is the first bridge arm, and the target winding is the A-phase winding WA; in some embodiments, the target bridge arm is the first bridge arm and the second bridge arm, and the target winding is the A-phase winding WA and the B-phase winding WB; in some embodiments, as shown in Figure 4 and Figure 5 the target bridge arm is the first bridge arm, the second bridge arm and the third bridge arm, and the target winding is the A-phase winding WA, the B-phase winding WB and the C-phase winding WC.

[0113] The one period corresponding to the preset frequency includes a first time period and a second time period performed in sequence, and the control of the turn-on and turn-off of the target bridge arm in the second control unit 2 according to the preset frequency includes:

[0114] In the first time period, the upper arm of all target bridge arms is controlled to be turned on, and the lower arm of all target bridge arms and the upper arm and lower arm of the bridge arms other than the target bridge arms are controlled to be turned off, and in the second time period, the lower arm of all target bridge arms is controlled to be turned on, and the upper arm of all target bridge arms and the upper arm and lower arm of the bridge arms other than the target bridge arms are controlled to be turned off; or,

[0115] In the first time period, the lower arm of all target bridge arms is controlled to be turned on, and the upper arm of all target bridge arms and the upper arm and lower arm of the bridge arms other than the target bridge arms are controlled to be turned off, and in the second time period, the upper arm of all target bridge arms is controlled to be turned on, and the lower arm of all target bridge arms and the upper arm and lower arm of the bridge arms other than the target bridge arms are controlled to be turned off.

[0116] The working principle of the second control unit 2 when performing the boosting function will be introduced below: Figures 4-5

[0117] Assuming that the first battery pack 11 is a faulty battery pack and the second battery pack 12 is a non-faulty battery pack, the first switch K1 is controlled to be turned on, the second switch K2 in the first battery pack 11 is controlled to be turned off, and the second switch K2 in the second battery pack 12 is controlled to be turned on, and then the second control unit 2 is controlled to perform the boosting function.

[0118] Specifically, when performing the boosting function, as shown in Figure 4 ​As shown, in the first period of each cycle corresponding to the preset frequency, the lower tubes of all target bridge arms are controlled to be turned on, and the upper tubes of all target bridge arms are controlled to be turned off. At this time, the second battery pack 12 charges the A-phase winding WA through the turned-on lower tube T4, charges the B-phase winding WB through the turned-on lower tube T5, and charges the C-phase winding WC through the turned-on lower tube T6. The charging current is basically constant. At the same time, the capacitor C1 supplies power to the n first electric control units 3, and the supply voltage is basically constant.

[0119] As shown in FIG. 1, the second electric control unit 2 is connected to the capacitor C1 and the n first electric control units 3. Figure 5 As shown, in the second period of each cycle corresponding to the preset frequency, the upper tubes of all target bridge arms are controlled to be turned on, and the lower tubes of all target bridge arms are controlled to be turned off. At this time, due to the characteristics of the winding (equivalent to inductance) that the current cannot be abruptly changed, the A-phase winding WA continues to flow through the turned-on upper tube T1, that is, the A-phase winding WA and the second battery pack 12 simultaneously charge the capacitor C1 through the turned-on upper tube T1, and supply power to the n first electric control units 3. The supply voltage is basically constant and equal to the sum of the voltage of the A-phase winding WA and the voltage of the second battery pack 12. Similarly, the B-phase winding WB continues to flow through the turned-on upper tube T2, that is, the B-phase winding WB and the second battery pack 12 simultaneously charge the capacitor C1 through the turned-on upper tube T2, and supply power to the n first electric control units 3. The C-phase winding WC continues to flow through the turned-on upper tube T3, that is, the C-phase winding WC and the second battery pack 12 simultaneously charge the capacitor C1 through the turned-on upper tube T3, and supply power to the n first electric control units 3. Since the upper tube and the lower tube of the target bridge arm in the second electric control unit 2 are alternately turned on according to the preset frequency, the voltage across the capacitor C1 is basically constant and equal to the sum of the voltage of the A-phase winding WA and the voltage of the second battery pack 12 (i.e., the preset voltage), which is greater than the voltage of the second battery pack 12. Therefore, the second electric control unit 2 can function as a voltage booster.

[0120] In some embodiments, the second electric control unit 2 is configured to control the upper tube and the lower tube of the target bridge arm in the second electric control unit 2 to be alternately turned on according to a preset frequency based on the rated voltage of the fault battery pack and the rated voltage of the non-fault battery pack.

[0121] In some embodiments, the second electric control unit 2 is configured to control the upper tube and the lower tube of the target bridge arm in the second electric control unit 2 to be alternately turned on according to a preset frequency based on the rated voltage of the fault battery pack and the rated voltage of the non-fault battery pack.

[0122] According to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, a target duty cycle D1 is derived;

[0123] According to the target duty cycle D1, a first control signal and a second control signal with a preset frequency are generated; wherein, the duty cycle of the first control signal is the target duty cycle D1, and the second control signal is opposite to the first control signal; and,

[0124] According to the fault condition of the first battery pack 11 and the second battery pack 12, the first control signal is output to the upper tube of the target bridge arm in the second electronic control unit 2, and the second control signal is output to the lower tube of the target bridge arm in the second electronic control unit 2, or the second control signal is output to the upper tube of the target bridge arm in the second electronic control unit 2, and the first control signal is output to the lower tube of the target bridge arm in the second electronic control unit 2, so as to control the upper tube and the lower tube of the target bridge arm in the second electronic control unit 2 to alternately conduct at a preset frequency.

[0125] Exemplarily, the first control signal and the second control signal are both PWM signals.

[0126] In this way, the boost ratio of the second electronic control unit 2 can be adjusted by adjusting the duty cycle of the first control signal, so that the second electronic control unit 2 can output appropriate voltage.

[0127] In some embodiments, the target duty cycle is derived according to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, comprising:

[0128] According to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, the target duty cycle is calculated according to a preset duty cycle calculation formula; wherein, the preset duty cycle calculation formula is D1=Ub / (Ua+Ub), D1 is the target duty cycle, Ua is the rated voltage of the non-faulty battery pack, and Ub is the rated voltage of the faulty battery pack.

[0129] In some embodiments, as Figures 4-5 shown, the first battery pack 11 is a faulty battery pack, and the second battery pack 12 is a non-faulty battery pack, at this time, D1=U1 / (U1+U2), wherein U1 is the rated voltage of the first battery pack 11, and U2 is the rated voltage of the second battery pack 12. In other embodiments, the first battery pack 11 is a non-faulty battery pack, and the second battery pack 12 is a faulty battery pack, at this time, D1=U2 / (U1+U2).

[0130] It is easy to understand that the voltage provided by the power battery 1 under normal circumstances is U1+U2, therefore, setting D1=Ub / (Ua+Ub) can make Uout=Ua / (1-D)=Ua / (1-Ub / (Ua+Ub))=Ua+Ub=U1+U2, that is, the output voltage Uout of the second control unit 2 is consistent with the voltage provided by the power battery 1 under normal circumstances, which can ensure that the motor 22 in the first control unit 3 can achieve the best performance.

[0131] In some embodiments, the first control signal is output to the upper tube of the target bridge arm in the second control unit 2 and the second control signal is output to the lower tube of the target bridge arm in the second control unit 2, or the second control signal is output to the upper tube of the target bridge arm in the second control unit 2 and the first control signal is output to the lower tube of the target bridge arm in the second control unit 2 according to the fault condition of the first battery pack 11 and the second battery pack 12, so as to control the upper tube and the lower tube of the target bridge arm in the second control unit 2 to be turned on alternately at a preset frequency, comprising:

[0132] When the first battery pack 11 fails, the second control signal is output to the upper tube of the target bridge arm in the second control unit 2 and the first control signal is output to the lower tube of the target bridge arm in the second control unit 2, so as to control the upper tube and the lower tube of the target bridge arm in the second control unit 2 to be turned on alternately at a preset frequency; and,

[0133] When the second battery pack 12 fails, the first control signal is output to the upper tube of the target bridge arm in the second control unit 2 and the second control signal is output to the lower tube of the target bridge arm in the second control unit 2, so as to control the upper tube and the lower tube of the target bridge arm in the second control unit 2 to be turned on alternately at a preset frequency.

[0134] In some embodiments, as shown in FIG. 1, Figures 4-5 When the first battery pack 11 fails and the second battery pack 12 is normal, the second control signal is output to the upper tube (i.e. upper tube T1-upper tube T3) of the target bridge arm in the second control unit 2 and the first control signal is output to the lower tube (i.e. lower tube T4-lower tube T6) of the target bridge arm in the second control unit 2.

[0135] In some embodiments, the control method of the driving system further comprises:

[0136] acquiring the state information of the single battery cell; and,

[0137] determining that one of the first battery pack 11 and the second battery pack 12 fails according to the state information of the single battery cell.

[0138] Exemplarily, the driving system can further comprise a battery management system (BMS), and the state information of the single battery cell can be acquired by the BMS, wherein the state information comprises voltage, temperature, current, etc. In some embodiments, a single battery cell with a voltage value out of a preset voltage value threshold range can be identified as a faulty battery cell, in some embodiments, a single battery cell with a temperature value out of a preset temperature value threshold range can be identified as a faulty battery cell, and in some embodiments, a single battery cell with a maximum current value less than a preset current threshold can be identified as a faulty battery cell. When at least one faulty battery cell is contained in one of the first battery pack 11 and the second battery pack 12, the battery pack is identified as a faulty battery pack.

[0139] As shown in Figure 2 , in some embodiments, one of the n first control units 3 and the second control unit 2 is multiplexed as a charging unit. The driving system 100 further comprises a direct current charging port 4, a capacitor C2, a third switch K3, and a fourth switch K4.

[0140] One end of the third switch K3 is electrically connected to the neutral point of the motor 22 in the charging unit, the other end of the third switch K3 is electrically connected to the positive electrode of the capacitor C2 and the positive electrode of the direct current charging port 4, the negative electrode of the capacitor C2 is electrically connected to the negative electrode of the second battery pack 12 and one end of the fourth switch K4, and the other end of the fourth switch K4 is electrically connected to the negative electrode of the direct current charging port 4.

[0141] The multi-phase winding of the motor 22 in the charging unit and the inverter 21 constitute a charging circuit, which is used to charge the power battery 1 after boosting the direct current received by the direct current charging port.

[0142] Please refer to Figure 1 again, based on the same inventive concept, the application further provides a driving system 100 comprising a power battery 1, n first control units 3, a second control unit 2, and a controller (not shown in the figure). Wherein, n is an integer, n≥1.

[0143] The power battery 1 comprises a first battery pack 11 and a second battery pack 12, and the negative electrode of the first battery pack 11 is electrically connected to the positive electrode of the second battery pack 12.

[0144] Each of the first electric control unit 3 and the second electric control unit 2 comprises an inverter 21 and a motor 22, the inverter 21 comprises an alternating current port 212 and a direct current port 211, the direct current port 211 is electrically connected with the positive pole of the first battery pack 11 and the negative pole of the second battery pack 12, and the alternating current port 212 is electrically connected with the corresponding motor 22. The neutral point of the motor 22 in the second electric control unit 2 is electrically connected with the negative pole of the first battery pack 11 and the positive pole of the second battery pack 12.

[0145] The controller is electrically connected with the n first electric control units 3 and the second electric control unit 2, and is used for executing the control method of the driving system in any of the above-mentioned embodiments.

[0146] Please refer to Figure 6 , based on the same inventive concept, the application also provides a vehicle 1000, the vehicle 1000 comprises a vehicle body 200 and the driving system 100 in any of the above-mentioned embodiments. Wherein, the driving system 100 is arranged in the vehicle body 200.

[0147] The driving system 100 and the vehicle 1000 provided by the application, when one of the first battery pack 11 and the second battery pack 12 fails, the second electric control unit 2 receives the voltage provided by the non-failed battery pack, and the second electric control unit 2 boosts the voltage provided by the non-failed battery pack to a preset voltage, so that at least one of the n first electric control units 3 can operate normally. In this way, the problem that the vehicle suddenly loses power due to the failure of a single cell can be avoided, the reliability of the driving system 100 can be improved, and the safety of the vehicle can be improved.

[0148] Based on the same inventive concept, the application further provides a computer readable storage medium, the computer readable storage medium stores executable instructions, when the executable instructions are executed by a processor, the control method of the driving system in any of the above-mentioned embodiments is realized.

[0149] The computer storage medium of the embodiments of the present application can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples (a non-exhaustive list) of the computer-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0150] The computer-readable signal medium can include a data signal propagated in baseband or propagated as a carrier wave, in which the computer-readable program code is contained. Such propagated data signals can take a wide variety of forms, including but not limited to electro-magnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium that is not a storage medium, that is, that is not a tangible medium.

[0151] The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber cable, RF, and the like, or any suitable combination of the above.

[0152] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments of the present application, electronic mail (email) can be utilized as the

[0153] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for a drive system, characterized in that: The control method of the drive system includes: When one of the first battery pack and the second battery pack fails, controlling the second electronic control unit to receive a voltage provided by the non-faulty battery pack; wherein the non-faulty battery pack is the battery pack that has not failed between the first battery pack and the second battery pack; controlling the second electronic control unit to boost the voltage provided by the non-faulty battery pack to a preset voltage and provide the voltage to at least one of the n first electronic control units; and Controlling at least one of the first electronic control units to drive a corresponding motor to operate according to a preset voltage; Wherein, the drive system includes: A power battery, comprising a first battery pack and a second battery pack, wherein the negative electrode of the first battery pack is electrically connected to the positive electrode of the second battery pack; n first electronic control units; wherein n is an integer and n≥1; and Second electronic control unit.

2. The control method of the drive system according to claim 1, wherein: The controlling the second electronic control unit to receive the voltage provided by the non-faulty battery pack includes: Controlling the first switch to be turned on so that the second electronic control unit receives the voltage provided by the non-faulty battery pack; The second electronic control unit includes a motor and a first switch, the first end of the first switch is electrically connected to the motor in the second electronic control unit, and the second end of the first switch is electrically connected to the negative electrode of the first battery pack and the positive electrode of the second battery pack.

3. The control method of the drive system according to claim 1, wherein: Before controlling the second electronic control unit to receive the voltage provided by the non-faulty battery pack, the control method of the drive system further includes: When a fault occurs in one of the first battery pack and the second battery pack, the second switch in the non-faulty battery pack is controlled to be turned on, and the second switch in the faulty battery pack is controlled to be turned off; Wherein, the first battery pack and the second battery pack both include a single battery cell and a second switch, and the single battery cell and the second switch are connected in series.

4. The control method of the drive system according to claim 1, wherein: The step of controlling the second electronic control unit to boost the voltage provided by the non-faulty battery pack to a preset voltage and provide the voltage to at least one of the n first electronic control units includes: controlling the upper tube and the lower tube of the target bridge arm in the second electronic control unit to be alternately turned on at a preset frequency based on the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack, so that the target bridge arm and the target winding in the second electronic control unit form a boost circuit to boost the voltage provided by the non-faulty battery pack to a preset voltage, and provide the voltage to at least one of the n first electronic control units; In which, the second electronic control unit includes a motor and an inverter, the inverter includes at least one bridge arm connected in parallel between the positive pole of the first battery pack and the negative pole of the second battery pack, the bridge arm includes an upper tube, a lower tube and a midpoint, at least one phase winding of the motor is electrically connected to the midpoint of at least one bridge arm in the inverter in a one-to-one correspondence; the target bridge arm is at least one bridge arm of the inverter of the second electronic control unit, and the target winding is the winding in the motor of the second electronic control unit that is electrically connected to the target bridge arm.

5. The control method of the drive system according to claim 4, characterized in that: The controlling the upper tube and the lower tube of the target bridge arm in the second electronic control unit to be alternately turned on at a preset frequency according to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack includes: deriving a target duty cycle based on the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack; generating a first control signal and a second control signal, both of which have a preset frequency, according to the target duty cycle; wherein the duty cycle of the first control signal is the target duty cycle, and the second control signal is inversely proportional to the first control signal; and According to the fault conditions of the first battery pack and the second battery pack, the first control signal is output to the upper tube of the target bridge arm in the second electronic control unit and the second control signal is output to the lower tube of the target bridge arm in the second electronic control unit, or the second control signal is output to the upper tube of the target bridge arm in the second electronic control unit and the first control signal is output to the lower tube of the target bridge arm in the second electronic control unit, thereby controlling the upper tube and the lower tube of the target bridge arm in the second electronic control unit to be alternately turned on according to a preset frequency.

6. The control method of the drive system according to claim 5, characterized in that: The step of obtaining a target duty cycle according to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack includes: The target duty cycle is calculated according to the rated voltage of the faulty battery pack and the rated voltage of the non-faulty battery pack according to a preset duty cycle calculation formula; wherein the preset duty cycle calculation formula is D1=Ub / (Ua+Ub), D1 is the target duty cycle, Ua is the rated voltage of the non-faulty battery pack, and Ub is the rated voltage of the faulty battery pack.

7. The control method of the driving system according to claim 6, characterized in that: The method outputs the first control signal to the upper tube of the target bridge arm in the second electronic control unit and outputs the second control signal to the lower tube of the target bridge arm in the second electronic control unit according to the fault conditions of the first battery pack and the second battery pack, or outputs the second control signal to the upper tube of the target bridge arm in the second electronic control unit and outputs the first control signal to the lower tube of the target bridge arm in the second electronic control unit, thereby controlling the upper tube and the lower tube of the target bridge arm in the second electronic control unit to be alternately turned on according to a preset frequency, including: When the first battery pack fails, outputting the second control signal to the upper tube of the target bridge arm in the second electronic control unit and outputting the first control signal to the lower tube of the target bridge arm in the second electronic control unit, thereby controlling the upper tube and the lower tube of the target bridge arm in the second electronic control unit to be alternately turned on at a preset frequency; and When the second battery pack fails, the first control signal is output to the upper tube of the target bridge arm in the second electronic control unit and the second control signal is output to the lower tube of the target bridge arm in the second electronic control unit, thereby controlling the upper tube and the lower tube of the target bridge arm in the second electronic control unit to be alternately turned on according to a preset frequency.

8. The control method of the driving system according to claim 3, wherein: The control method of the drive system further includes: Obtaining status information of a single cell; and According to the status information of the single battery cells, it is determined that one of the first battery pack and the second battery pack has a fault.

9. A drive system, characterized in that: The drive system comprises: A power battery, the power battery comprising a first battery pack and a second battery pack, wherein the negative electrode of the first battery pack is electrically connected to the positive electrode of the second battery pack; n first electronic control units; wherein n is an integer, n ≥ 1; a second electronic control unit; and A controller is electrically connected to the n first electronic control units and the second electronic control unit, and is used to execute the control method of the drive system according to any one of claims 1 to 8.

10. A vehicle, characterized in that: include: Vehicle body; as well as The drive system according to claim 9; wherein the drive system is arranged in the vehicle body.

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