Motor control system, method, storage medium, and new energy vehicle

Abstract

The present invention discloses a motor control system, method, storage medium, and new energy vehicle, relating to the technical field of new energy vehicles. The system includes: a motor; a power module, the DC side of which is provided with a DC bus to connect to a power battery, a DC side fuse is provided on the DC bus, and the AC side is connected to the motor through three-phase lines; a phase line cutting device, provided corresponding to at least two of the three-phase lines; a detection device, configured to detect at least one of the arm fault condition of the power module and the connection condition of the DC side fuse, and configured to detect the rotational speed of the motor; a first control device, configured to control the phase line cutting device to cut at least two of the three-phase lines when at least one of the disconnection of the DC side fuse and the occurrence of an arm short circuit fault of the power module occurs and the rotational speed of the motor is greater than a first preset rotational speed. This system can reduce or avoid the risk of arcing or even open flames caused by severe motor control system failures.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and particularly to a motor control system, a method, a storage medium, and a new energy vehicle. Background Art

[0002] In related technologies, generally, the selection parameters of devices in the motor control system or the raw materials used for components are optimized to enhance the resistance to abnormal energy of the electric control to a certain extent. However, in the above technologies, the motor drive circuit has always been connected, so that in some fault situations, other energy feedback paths may be formed, resulting in the existence of long-term large current or abnormal large current, which may cause secondary damage to the devices, and finally may lead to serious consequences such as device explosion or insulation failure, arc or open fire. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. For this purpose, the object of the present invention is to provide a motor control system, a method, a storage medium, and a new energy vehicle to reduce or avoid the risk of arc or even open fire caused by serious motor control system failures.

[0004] In a first aspect, an embodiment of the present invention provides a motor control system, including a motor and a power module. A DC bus is provided at the DC end of the power module for connecting to a power battery, and a DC side fuse is provided on the DC bus. The AC end of the power module is connected to the motor through three-phase lines. The system further includes: a phase line cutting device provided corresponding to at least two of the three-phase lines; a detection device for detecting at least one of first operating information and second operating information, and for detecting third operating information, where the first operating information includes the bridge arm fault condition of the power module, the second operating information includes the connection condition of the DC side fuse, and the third operating information includes the speed of the motor; a first control device respectively connected to the phase line cutting device and the detection device, and configured to control the phase line cutting device to cut at least two of the three-phase lines when at least one of the disconnection of the DC side fuse and the occurrence of a bridge arm short circuit fault in the power module occurs, and the speed of the motor is greater than a first preset speed.

[0005] In addition, the motor control system of the embodiment of the present invention may further have the following additional technical features:

[0006] According to an embodiment of the present invention, the third operating information further includes the phase current of the motor, and the first control device is configured to control the phase line cutting device to cut at least two of the three-phase lines when the DC side fuse is disconnected, the speed of the motor is greater than the first preset speed, and the phase current of the motor is greater than a first preset current and lasts for more than a first preset time.

[0007] According to an embodiment of the present invention, the detection device is at least used to detect the bus voltage difference across the DC-side fuse, and determine that the DC-side fuse is disconnected when the bus voltage difference across the DC-side fuse is greater than a first voltage threshold; and / or, the detection device is at least used to detect the bus current of the DC bus where the DC-side fuse is located, and determine that the DC-side fuse is disconnected when the bus current is less than a first current threshold.

[0008] According to an embodiment of the present invention, the first control device is used to control the phase wire cutting device to cut at least two of the three-phase wires when a bridge arm short circuit fault occurs in the power module and lasts for more than a second preset time, and the speed of the motor is greater than the first preset speed.

[0009] According to an embodiment of the present invention, the second operating information further includes the temperature of the power module (PM), and the first control device is further used to determine that the temperature of the power module is greater than a first preset temperature before controlling the phase wire cutting device to cut at least two of the three-phase wires.

[0010] According to an embodiment of the present invention, the first operating information further includes the collision condition of the new energy vehicle where the motor control system is located, and the first control device is further used to determine that the new energy vehicle has a collision with a severity level greater than a preset level before controlling the phase wire cutting device to cut at least two of the three-phase wires.

[0011] According to an embodiment of the present invention, the first control device includes: an ignition module connected to the phase wire cutting device; a first control module connected to the ignition module and the detection device respectively, and used to control the phase wire cutting device to cut at least two of the three-phase wires through the ignition module when at least one of the disconnection of the DC-side fuse and the occurrence of a bridge arm short circuit fault in the power module occurs.

[0012] According to an embodiment of the present invention, the system further includes a second control device, and the second control device includes: a second control module and a drive module; wherein, the second control module is connected to the detection device and the drive module respectively, and is used to control the drive module to drive the power module to turn off when the DC-side fuse is disconnected, a bridge arm fault occurs in the power module, and the speed of the motor is greater than a second preset speed, where the second preset speed is less than or equal to the first preset speed.

[0013] According to an embodiment of the present invention, the second control device further includes: a conversion module connected to a control end of the power module through the driving module; a deadlock monitoring module respectively connected to the second control module, the conversion module, and the driving module, and configured to, when detecting that the second control module is deadlocked, control the driving module to drive the power module to turn off through the conversion module, or directly control the driving module to drive the power module to turn off.

[0014] According to an embodiment of the present invention, the system further includes: a power supply device including a first power supply module, an input end of the first power supply module is used to connect to a storage battery, an output end of the first power supply module is connected to the driving module, and the first power supply module is configured to convert a first voltage provided by the storage battery into a second voltage to supply power to the driving module; a third control device connected to the first power supply module, and configured to monitor the first power supply module and, when detecting that the first power supply module is abnormal, control the driving module to drive the power module to turn off.

[0015] According to an embodiment of the present invention, the third control device includes: a power supply monitoring module connected to the first power supply module, and configured to monitor the first power supply module and, when detecting that the first power supply module is abnormal, output a power supply abnormal protection signal to an isolation module; the isolation module is configured to, when receiving the power supply abnormal protection signal, output an active short - circuit signal to the driving module to control the driving module to drive the power module to turn off.

[0016] According to an embodiment of the present invention, the first control module is further respectively connected to the second control module, the power supply monitoring module, and the isolation module, and is further configured to determine that at least one of a communication abnormality with the second control module, receiving the power supply abnormal protection signal, and receiving the active short - circuit signal occurs before controlling the phase - line cutting device to cut at least two of the three - phase lines.

[0017] According to an embodiment of the present invention, the input end of the first power supply module is connected to the storage battery through a first anti-reverse diode. The power supply device further includes: a voltage conversion module, the input end of the voltage conversion module is connected to the power battery, and is used to step down the third voltage output by the power battery to the first voltage; a second power supply module, the input end of the second power supply module is connected to the storage battery, and is used to convert the first voltage output by the storage battery into a fourth voltage to supply power to the second control module; a third power supply module, the input end of the third power supply module is connected to the storage battery through a second anti-reverse diode and is connected to the output end of the voltage conversion module through a third anti-reverse diode, and is used to convert the first voltage output by the storage battery or the voltage conversion module into a fifth voltage to supply power to the first control module.

[0018] According to an embodiment of the present invention, the input end of the first power supply module is further connected to the output end of the voltage conversion module through a fourth anti-reverse diode.

[0019] According to an embodiment of the present invention, the input end of the first power supply module is sequentially connected to the storage battery through a fifth anti-reverse diode and a second anti-reverse diode. The power supply device further includes: a voltage conversion module, the input end of the voltage conversion module is connected to the power battery, and is used to step down the third voltage output by the power battery to the first voltage. Among them, the input end of the first power supply module is further sequentially connected to the output end of the voltage conversion module through the fifth anti-reverse diode and the third anti-reverse diode; a second power supply module, the input end of the second power supply module is sequentially connected to the storage battery through a sixth anti-reverse diode and the second anti-reverse diode, and is sequentially connected to the output end of the voltage conversion module through the sixth anti-reverse diode and the third anti-reverse diode. The second power supply module is used to convert the first voltage output by the storage battery or the voltage conversion module into a fourth voltage to supply power to the second control module; a third power supply module, the input end of the third power supply module is connected to the storage battery through the second anti-reverse diode and is connected to the output end of the voltage conversion module through the third anti-reverse diode, and is used to convert the first voltage output by the storage battery or the voltage conversion module into a fifth voltage to supply power to the first control module.

[0020] According to an embodiment of the present invention, the ignition module and the phase wire cut-off device are connected to the storage battery through the second anti-reverse diode and are connected to the output end of the voltage conversion module through the third anti-reverse diode.

[0021] Second aspect, an embodiment of the present invention provides a motor control method, including: when at least one of a DC-side fuse being disconnected and a bridge-arm short-circuit fault occurring in a power module occurs, and the speed of the motor is greater than a first preset speed, cutting at least two of the three-phase lines, where a DC bus is provided at the DC end of the power module for connecting to a power battery, and the DC-side fuse is provided on the DC bus, and the AC end of the power module is connected to the motor through the three-phase lines.

[0022] In addition, the motor control method of the embodiment of the present invention may further have the following additional technical features:

[0023] According to an embodiment of the present invention, before cutting at least two of the three-phase lines, the method further includes: determining that the phase current of the motor is greater than a first preset current and lasts for more than a first preset time.

[0024] According to an embodiment of the present invention, before cutting at least two of the three-phase lines, the method further includes: determining that the duration of the bridge-arm short circuit in the power module is greater than a second preset time.

[0025] According to an embodiment of the present invention, before cutting at least two of the three-phase lines, the method further includes: determining that the temperature of the power module is greater than a first preset temperature.

[0026] According to an embodiment of the present invention, before cutting at least two of the three-phase lines, the method further includes: determining that the new energy vehicle where the motor is located has a collision with a severity level greater than a preset level.

[0027] Third aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the motor control method described in the second aspect embodiment above.

[0028] Fourth aspect, an embodiment of the present invention provides a new energy vehicle, including: a power battery and the motor control system described in the first aspect embodiment above.

[0029] The motor control system, method, storage medium, and new energy vehicle of the embodiments of the present invention, by controlling the phase line cutting device to cut at least two of the three-phase lines when at least one of a bridge-arm short-circuit fault occurring in the power module and a DC-side fuse being disconnected occurs, and the speed of the motor is greater than a first preset speed, can reduce or avoid the risk of arcing or even open flames caused by serious motor control system failures.

[0030] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0031] Figure 1(a) is a schematic structural diagram of a four-wheel drive vehicle according to an example of the present invention;

[0032] Figure 1(b) is a schematic structural diagram of a front-wheel drive two-wheel vehicle according to an example of the present invention;

[0033] Figure 1(c) is a schematic structural diagram of a rear-wheel drive two-wheel vehicle according to an example of the present invention;

[0034] Figure 1(d) is a schematic structural diagram of a simple four-wheel drive vehicle according to an example of the present invention;

[0035] Figure 1(e) is a schematic structural diagram of an independent four-wheel drive vehicle according to an example of the present invention;

[0036] Figure 2 is a schematic diagram of an energy feedback current loop when the insurance is damaged according to an example of the present invention;

[0037] Figure 3 is a schematic diagram of an energy feedback current loop when a certain bridge of the power module is short-circuited and damaged according to an example of the present invention;

[0038] Figure 4 is a schematic structural diagram of a motor control system according to the first embodiment of the present invention;

[0039] Figure 5 is a flowchart of the operation of the first control device according to an embodiment of the present invention;

[0040] Figure 6 is a schematic structural diagram of a motor control system according to the second embodiment of the present invention;

[0041] Figure 7 is a schematic structural diagram of a motor control system according to the third embodiment of the present invention;

[0042] Figure 8 is a schematic structural diagram of a motor control system according to the fourth embodiment of the present invention;

[0043] Figure 9 is a schematic structural diagram of a motor control system according to the fifth embodiment of the present invention;

[0044] Figure 10 is a schematic structural diagram of a motor control system according to the sixth embodiment of the present invention;

[0045] Figure 11 is a schematic structural diagram of a motor control system according to the seventh embodiment of the present invention;

[0046] Figure 12 is a schematic structural diagram of the power supply of the motor control system according to the first embodiment of the present invention;

[0047] Figure 13It is a schematic diagram of the power supply structure of the motor control system according to the second embodiment of the present invention;

[0048] Figure 14 It is a schematic diagram of the power supply structure of the motor control system according to the third embodiment of the present invention;

[0049] Figure 15 It is a flowchart of the motor control method according to an embodiment of the present invention;

[0050] Figure 16 It is a structural block diagram of a new energy vehicle according to an embodiment of the present invention.

[0051] Description of reference numerals:

[0052] 100, motor control system; 200, new energy vehicle;

[0053] 110, phase line cutting device; 120, detection device; 140, first control device; 150, second control device; 160, third control device; 170, power supply device;

[0054] 121, terminal overvoltage detection module; 122, bus overvoltage detection module; 123, overcurrent detection module; 124, OR gate module; 131, terminal voltage sampling module; 132, temperature sampling module; 133, bus voltage sampling module; 134, current sampling module; 135, motor rotor position sampling module; 141, ignition module; 142, first control module; 151, second control module; 152, conversion module; 153, drive module; 154, deadlock monitoring module; 161, power supply monitoring module; 162, isolation module; 171, first power supply module; 172, voltage conversion module; 173, second power supply module; 174, third power supply module;

[0055] M, motor; PM, power module; Bat, power battery; FU, DC side fuse; 10, storage battery; D1, first anti - reverse diode; D2, second anti - reverse diode; D3, third anti - reverse diode; D4, fourth anti - reverse diode; D5, fifth anti - reverse diode; D6, sixth anti - reverse diode. Detailed implementation manners

[0056] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0057] Figures 1(a) - 1(e) show the drive connection structures of new energy vehicles of different models. Referring to Figures 1(a) - 1(e), new energy vehicles are mainly divided into four-wheel drive vehicles (as shown in Figure 1(a)), front-wheel drive two-wheel drive vehicles (as shown in Figure 1(b)), rear-wheel drive two-wheel drive vehicles (as shown in Figure 1(c)), simplified four-wheel drive vehicles (as shown in Figure 1(d)), and independent four-wheel drive vehicles (as shown in Figure 1(e)). Among them, new energy vehicles can be divided into front-wheel drive, rear-wheel drive, or four-wheel drive according to whether the drive wheels are distributed in the front compartment, the rear compartment, or both the front and rear compartments. When a new energy vehicle is towed or dragged, if the drive wheels are driven to operate forcibly, the drive wheels will drive the motor M to rotate, and the motor M will become a generator. At this time, the new energy vehicle is in the power generation working condition. When the new energy vehicle is a multi-wheel drive vehicle (as shown in Figures 1(a), 1(d), and 1(e)), if one of the motor drive systems fails, the other motor drive systems can still drive the new energy vehicle to continue running. When other vehicles or power sources drive the new energy vehicle to run, the wheels of the faulty motor drive system are driven to rotate, and the wheels rotate to drive the motor M of the abnormal motor drive system to rotate, becoming a generator. At this time, the abnormal motor drive system is in the power generation working condition. Among them, the green arrows in Figures 1(a) - 1(e) represent the direction of mechanical energy, and the red arrows represent the direction of electrical energy.

[0058] When the motor control system is not damaged, this power generation working condition is a normal feedback working condition. However, when the motor control system is abnormal, normal control and wave feedback are no longer carried out. The six-phase of the power module PM in the motor control system is open-circuited, and the current flows through the diodes in the power module PM for passive rectification and flows to the power battery, charging the power battery Bat. However, in some cases, when the fuse of the abnormal drive source DC bus melts, the wheels drive the motor M to generate power, and its energy will charge the bus capacitor C. When the bus capacitor C is full, the bus voltage will slowly rise until it exceeds the withstand voltage of the power module PM or the capacitor withstand voltage, causing one or both of them to be damaged. Among them, FPM in Figures 1(a) - 1(e) represents the power module corresponding to the front compartment, and RPM represents the power module corresponding to the rear compartment.

[0059] Figure 2 shows the energy feedback current loop when the DC side fuse FU is damaged. Refer to Figure 2, when the motor drive system is abnormal, the DC-side fuse FU is often blown to protect the motor drive system. After the DC-side fuse FU is blown, the electrical connection circuit between the motor drive system and the power battery Bat is disconnected. If the new energy vehicle is in the above-mentioned power generation condition at this time, the motor M acts as a generator and undergoes uncontrolled rectification through the power module PM, and the current flows to the bus capacitor C to charge the bus capacitor C. If the above power generation condition continues, since the capacitance is limited, the bus capacitor C will be fully charged. At this time, there is no storage location for the energy. If power generation continues, the bus voltage will gradually rise, possibly exceeding the allowable voltage value of the power module PM or the bus capacitor C, causing damage to the power module PM or the bus capacitor C.

[0060] In some cases, the state of the power module PM after abnormal damage is a short circuit. At this time, a circuit will be formed between the power module PM and the motor coil. If there is current flowing through for a long time, it will cause secondary damage to the power module PM, and may lead to serious consequences such as insulation failure and abnormal short circuit of the power module PM.

[0061] Figure 3 Shows the energy feedback current loop when a certain arm of the power module PM is short-circuited and damaged. Refer to Figure 3 , when one arm of the power module PM is damaged due to abnormal reasons and is in a short-circuit state after damage, if the new energy vehicle is in the above-mentioned power generation condition, a current loop will be formed between the motor M and the abnormal short-circuit arm of the power module PM, and the current will continuously circulate in the loop. If the power generation power is large at this time, the circulating current in the loop will be very large, and since there is no current storage component in the loop, the current may rise sharply or continue to operate until the power module PM is damaged for the second time, and in severe cases, it may damage the insulation layer and cause serious consequences such as open fire.

[0062] Therefore, the present invention proposes a motor control system, which sets a phase wire cutting device corresponding to the three-phase wires connected between the motor and the power module, and when the motor control system fails severely, controls the phase wire cutting device to cut at least two of the three-phase wires, so as to completely cut off the energy feedback path to eliminate the above risks.

[0063] The motor control system, method, storage medium, and new energy vehicle of the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0064] Figure 4 Is the structural block diagram of the motor control system of the first embodiment of the present invention.

[0065] As Figure 4As shown in the figure, the motor control system 100 includes: a motor M, a power module PM, a phase wire cutting device 110, a detection device 120, and a first control device 140. The DC side of the power module PM is provided with a DC bus for connecting to the power battery Bat. A DC side fuse FU (which may include one or more fuses, Figure 4 illustrated by taking the positive and negative terminals of the DC side as an example to connect one fuse respectively) is provided on the DC bus. The AC side of the power module PM is connected to the motor M through three-phase wires. The phase wire cutting device 110 is provided corresponding to at least two of the three-phase wires. The detection device 120 is configured to detect at least one of the first operating information (which may be the operating information of the power module PM) and the second operating information (which may be the operating information of the motor control system 100 or the vehicle where it is located other than the power module PM and the motor M), and is configured to detect the third operating information (which may be the operating information of the motor M). The first operating information includes the arm fault condition of the power module PM. The second operating information includes the connection condition of the DC side fuse FU. The third operating information includes the rotational speed of the motor M. The first control device 140 is respectively connected to the phase wire cutting device 110 and the detection device 120, and is configured to determine that the fault level of the motor control system 100 is the preset highest level, such as high level, when at least one of the disconnection of the DC side fuse FU and the occurrence of an arm short circuit fault in the power module PM occurs, and the rotational speed of the motor M is greater than the first preset rotational speed. At this time, the phase wire cutting device 110 is controlled to cut at least two of the three-phase wires.

[0066] Wherein, the first operating information may further include but is not limited to the bus voltage, terminal voltage, etc. of the power module PM. The third operating information may further include but is not limited to the phase current of the motor M, such as three-phase current. The arm fault of the power module PM may be an upper arm fault or a lower arm fault, and this fault may be a short circuit fault.

[0067] In this embodiment, as an implementation manner, the processing flow of the first control device 140 is as Figure 5 shown. Refer to Figure 5, when the first control device 140 receives an upper bridge error signal or a lower bridge error signal (generated due to a short - circuit fault in the corresponding bridge arm), or detects that the DC - side fuse FU is disconnected, it can obtain the speed of the motor M and determine whether the fault level of the motor control system 100 is high - level according to the speed, etc., that is, currently meet the condition for enabling ultimate protection (cutting at least two of the three - phase lines). For example, it is determined whether the speed is severely abnormal (such as the speed of the motor M is greater than a first preset speed (such as greater than or equal to 3000 r / min)). If so, it is determined that the fault level of the motor control system 100 is high - level. At this time, the first control device 140 can control the phase - line cutting device 110 to cut at least two of the three - phase lines to completely cut off the energy feedback path, thus preventing possible arcing or open - fire phenomena. Of course, if it is determined that the fault level of the motor control system 100 is not high - level, it returns to the step of fault reception and judgment.

[0068] In some embodiments of the present invention, the third operating information further includes the phase current of the motor M. The first control device 140 is configured to control the phase - line cutting device 110 to cut at least two of the three - phase lines when the DC - side fuse FU is disconnected, the speed of the motor M is greater than the first preset speed, and the phase current of the motor M is greater than the first preset current (such as greater than or equal to 50 A) and lasts for more than the first preset time (such as 3 s).

[0069] In some embodiments of the present invention, as an implementation manner, the detection device 120 is at least used to detect the bus voltage difference across the DC - side fuse FU. When the target line voltage difference across the DC - side fuse FU is greater than the first voltage threshold, it is determined that the DC - side fuse FU is disconnected.

[0070] Among them, referring to Figure 4 , the DC - side fuse FU includes two fuses, which are respectively denoted as the first fuse (connected to the positive extreme of the DC - side) and the second fuse (connected to the negative extreme of the DC - side). A first detection point can be set on the line between the first fuse and the power battery Bat, a second detection point can be set on the line between the second fuse and the power battery Bat, a third detection point can be set on the line between the first fuse and the DC - side of the power module PM, and a fourth detection point can be set on the line between the second fuse and the DC - side of the power module PM. The detection device 120 can detect the voltage U1 between the first detection point and the second detection point, and the voltage U2 between the third detection point and the fourth detection point. The bus voltage difference across the DC - side fuse FU is U1 - U2.

[0071] As another implementation manner, the detection device 120 is at least used to detect the bus current of the DC bus where the DC - side fuse FU is located. When the bus current is less than the first current threshold, it is determined that the DC - side fuse FU is disconnected.

[0072] Among them, referring to Figure 4, the bus current can be the current flowing through the first fuse, or the current flowing through the second fuse, or the average value of the current flowing through the first fuse and the current flowing through the second fuse.

[0073] As another implementation, to improve reliability, the detection device 120 is configured to determine that the DC-side fuse FU is disconnected when the voltage difference across the DC-side fuse FU is greater than the first voltage threshold and the bus current is less than the first current threshold.

[0074] In some embodiments of the present invention, the first control device 140 is configured to control the phase wire cutting device 110 to cut at least two of the three-phase wires when a bridge arm short circuit occurs in the power module PM and lasts for more than a second preset time (such as 330 ms), and the rotational speed of the motor M is greater than a first preset rotational speed.

[0075] In some embodiments of the present invention, the second operating information further includes the temperature of the power module PM. Before controlling the phase wire cutting device 110 to cut at least two of the three-phase wires, the first control device 140 is further configured to determine that the temperature of the power module PM is greater than a first preset temperature.

[0076] By adding the judgment of the temperature, the reliability of the judgment on whether a serious fault occurs in the motor control system can be improved.

[0077] In some embodiments of the present invention, the first operating information further includes the collision condition of the new energy vehicle where the motor control system 100 is located. Before controlling the phase wire cutting device 110 to cut at least two of the three-phase wires, the first control device 140 is further configured to determine that the new energy vehicle has a collision with a severity level greater than a preset level.

[0078] By adding the judgment on whether the new energy vehicle has a collision with a severity level greater than a preset level, the reliability of the judgment on whether a serious fault occurs in the motor control system can be improved.

[0079] In some embodiments of the present invention, such as Figure 6 shown, the first control device 140 includes: an ignition module 141 and a first control module 142.

[0080] Among them, the ignition module 141 is connected to the phase wire cutting device 110; the first control module 142 is respectively connected to the ignition module 141 and the detection device 120, and is used to control the phase wire cutting device 110 to cut at least two of the three-phase wires through the ignition module 141 when at least one of the DC side fuse FU is disconnected and the power module PM has a bridge arm short circuit fault, and the rotational speed of the motor M is greater than the first preset rotational speed. Of course, the first control module 142 can also be used to control the phase wire cutting device 110 to cut at least two of the three-phase wires through the ignition module 141 when the conditions for the first control device 140 to control the phase wire cutting device 110 to cut at least two of the three-phase wires are met.

[0081] In this embodiment, the first control module 142 can adopt a CPLD (Complex Programmable Logic Device). The ignition module 141 can be independently arranged with the first control module 142 or integrated with the first control module 142. Figure 6 Taking the independent arrangement as an example for illustration. Compared with the integrated arrangement, the independent arrangement is easier to implement and has better flexibility. The ignition module 141 can be a driving chip, which can convert the milliamp-level current of the first control module 142 into an amp-level current, and monitor whether the phase wire cutting device 110 is normal. For example, it can detect the internal resistance of the phase wire cutting device 110, apply a current to the internal resistance, and judge whether the phase wire cutting device 110 is normal according to the received voltage value.

[0082] In some embodiments of the present invention, as Figure 7 shown, the motor control system 100 further includes a second control device 150, and the second control device 150 includes: a second control module 151 and a driving module 153.

[0083] Among them, the second control module 151 is respectively connected to the detection device 120 and the driving module 153, and is used to determine that the fault level of the motor control system 100 is the preset lowest level, such as a low level, when the DC side fuse FU is disconnected, the power module PM has a bridge arm fault, and the rotational speed of the motor M is greater than the second preset rotational speed. At this time, the driving module 153 is controlled to turn off the power module PM. Among them, the second preset rotational speed is less than or equal to the first preset rotational speed.

[0084] Specifically, the second control module 151 may adopt a DSP (Digital Signal Processing) chip. The DSP chip can collect the arm fault signals of the power module PM, the phase current and speed of the motor M, the connection status of the DC side fuse FU, etc. When any of the following occurs: the DC side fuse FU is disconnected, an arm fault appears in the power module PM, or the speed of the motor M is greater than the second preset speed, the DSP chip outputs PWM waves (such as 6 PWM waves corresponding to the 6 arms of the power module PM) to the drive module 153, the normal drive is interrupted, and the fault handling program is entered to execute corresponding fault response actions, such as driving the power module PM to turn off. Among them, the condition for the first control module 142 to control the phase wire cutting device 110 to cut off at least two of the three phase wires through the ignition module 141 is stricter than the condition for the second control module 151 to control the drive module 153 to drive the power module PM to turn off. The specific situation is not limited to the above and can be set as needed.

[0085] In some examples, such as Figure 8 、 Figure 9 shown, the detection device 120 includes: a fuse sampling module ( Figure 8 、 Figure 9 not shown in Figure 8 、 Figure 9 ), a current sampling module 134, a speed sampling module ( Figure 8 、 Figure 9 not shown in Figure 8 、 Figure 9 ), an upper bridge fault detection module (

[0086] Among them, the insurance sampling module is respectively connected to the first control module 142 and the second control module 151, and is used to sample the voltage difference across the DC-side fuse FU and / or the bus current of the DC bus where it is located, and send the voltage difference and the bus current to the first control module 142 and the second control module 151 respectively; the current sampling module 134 is respectively connected to the first control module 142 and the second control module 151, and is used to sample the phase current of the motor and send the phase current to the first control module 142 and the second control module 151 respectively; the speed sampling module is respectively connected to the first control module 142 and the second control module 151, and is used to sample the speed of the motor M and send the speed to the first control module 142 and the second control module 151 respectively; the upper-bridge fault detection module is respectively connected to the upper bridge arm of the power module PM, the first control module 142 and the second control module 151, and is used to output an upper-bridge error signal to the first control module 142 and the second control module 151 respectively when it detects that a fault occurs in the upper bridge arm of the power module PM; the lower-bridge fault detection module is respectively connected to the lower bridge arm of the power module PM, the first control module 142 and the second control module 151, and is used to output a lower-bridge error signal to the first control module 142 and the second control module 151 respectively when it detects that a fault occurs in the lower bridge arm of the power module PM; among them, the first control module 142 and the second control module 151 are used to determine that a bridge-arm fault occurs in the power module when receiving the upper-bridge error signal or the lower-bridge error signal.

[0087] As an implementation manner, the above speed sampling module may include a motor rotor position sampling module 135 and a decoding module. The motor rotor position sampling module 135 is connected to the decoding module and is used to sample the rotor position of the motor M and send the rotor position to the decoding module. The decoding module is respectively connected to the first control module 142 and the second control module 151 and is used to decode the rotor position of the motor M to obtain the speed of the motor M and provide the speed to the first control module 142 and the second control module 151. This implementation manner can achieve obtaining the speed of the motor M even when the communication between the first control module 142 and the second control module 151 is abnormal.

[0088] As another implementation manner, see Figure 8 、 Figure 9 ., the above speed sampling module may include a motor rotor position sampling module 135, and the decoding module may be integrated in the second control module 151. The motor rotor position sampling module 135 is connected to the second control module 151 and is used to sample the rotor position of the motor M and send the rotor position to the second control module 151, so that the second control module 151 obtains the speed of the motor M according to the rotor position and sends the speed to the first control module 142.

[0089] In some embodiments, see Figure 8, Figure 9 , the detection device 120 may further include: a terminal voltage sampling module 131, a temperature sampling module 132, a bus voltage sampling module 133, and a collision detection module ( Figure 8 not shown in the figure).

[0090] Among them, the terminal voltage sampling module 131 is respectively connected to the first control module 142 and the second control module 151, and is configured to sample the terminal voltage of the power module PM and send the terminal voltage to the first control module 142 and the second control module 151 respectively; the temperature sampling module 132 is connected to the second control module 151, and is configured to sample the temperature of the power module PM and send the temperature to the second control module 151; the bus voltage sampling module 133 is respectively connected to the first control module 142 and the second control module 151, and is configured to sample the bus voltage of the power module PM and send the bus voltage to the first control module 142 and the second control module 151 respectively; the collision detection module is respectively connected to the first control module 142 and the second control module 151, and is configured to output a collision signal to the first control module 142 and the second control module 151 respectively when it detects that the new energy vehicle where the motor control system 100 is located has a collision.

[0091] In this example, among them, the first control module 142 is further configured to determine that at least one of the terminal voltage is greater than a first preset voltage, the bus voltage is greater than a second preset voltage, the temperature is greater than a first preset temperature, and a collision signal is received before controlling the phase wire cutting device to cut at least two of the three-phase wires; the second control module 151 is further configured to control the driving module 153 to drive the power module PM to turn off when any one of the terminal voltage is greater than a third preset voltage, the bus voltage is greater than a fourth preset voltage, the temperature is greater than a second preset temperature, and a collision signal is received, where the third preset voltage is less than or equal to the first preset voltage, the fourth preset voltage is less than or equal to the second preset voltage, and the second preset temperature is greater than the first preset temperature.

[0092] Specifically, when the second control module 151 receives any one of a collision signal (general collision, collision with a severity level less than or equal to a preset level), an upper-bridge error signal, a lower-bridge error signal, overvoltage of line voltage or terminal voltage, overcurrent of three-phase current, overhigh temperature, and abnormal rotation speed, it determines that the fault level of the motor control system 100 is low. At this time, the conversion module 152 can be used to control the driving module 153 to drive the power module PM to turn off. When the first control module 142 receives an upper-bridge error signal or a lower-bridge error signal, and determines that the rotation speed of the motor M is greater than a first preset rotation speed, the phase current is greater than a first preset current and lasts for a preset time, it further judges the bus voltage, terminal voltage, collision signal (severe collision, collision with a severity level greater than the preset level), etc. If it meets the conditions for enabling ultimate protection, it determines that the fault level of the motor control system 100 is high. At this time, the first control device 140 can control the phase wire cutting device 110 to cut at least two of the three-phase wires to completely cut off the energy feedback path, thereby preventing possible arcing or open fire phenomena.

[0093] In some examples, such as Figure 8 , Figure 9 shown, the detection device 120 may further include: a fault detection unit, and the fault detection unit includes: a terminal overvoltage detection module 121, a bus overvoltage detection module 122, an overcurrent detection module 123, and an OR gate module 124.

[0094] Among them, the terminal overvoltage detection module 121 is connected to the terminal voltage sampling module 131 and is used to output a terminal overvoltage signal when detecting terminal voltage overvoltage; the bus overvoltage detection module 122 is connected to the bus voltage sampling module 133 and is used to output a bus overvoltage signal when detecting bus voltage overvoltage; the overcurrent detection module 123 is connected to the current sampling module 134 and is used to output an overcurrent error signal when detecting overcurrent in at least one phase of the three-phase current; the OR gate module 124 is respectively connected to the overcurrent detection module 123, the bus overvoltage detection module 122, the terminal overvoltage detection module 121, the upper-bridge fault detection module, the lower-bridge fault detection module, and the second control module 151, and is used to output an interrupt signal to the second control module 151 when receiving any one of the overcurrent error signal, the bus overvoltage signal, the terminal overvoltage signal, the upper-bridge error signal, and the lower-bridge error signal, so that the second control module 151 controls the driving module 153 to drive the power module PM to turn off.

[0095] In this example, the bus overvoltage signal, terminal overvoltage signal, and overcurrent error signal, together with the upper-bridge error signal and lower-bridge error signal, are input into the OR gate module 124 to form a total error signal, which is input to the interrupt pin of the second control module 151. When the total error signal is 0, it indicates that the motor control system 100 has not experienced overvoltage, overcurrent, or upper- and lower-bridge faults, and at this time, the interrupt is not enabled; when the total error signal is 1, it indicates that the motor control system 100 has experienced at least one of overvoltage, overcurrent, or upper- and lower-bridge faults, and at this time, the interrupt is enabled, which can enable the second control module 151 to respond faster, thereby quickly performing protection actions.

[0096] As an implementation, the fault detection unit may further include an insurance detection module for detecting whether the voltage difference across the DC-side fuse FU is greater than a first voltage threshold and / or whether the bus current is less than a first current threshold, and sending the detection results to the first control module 142 and the second control module 151.

[0097] In some embodiments of the present invention, as Figures 8 - 10 shown, the second control device 150 further includes: a conversion module 152 and a deadlock monitoring module 154. The conversion module 152 is connected to the control terminal of the power module PM through the drive module 153, and the deadlock monitoring module 154 is respectively connected to the second control module 151, the conversion module 152, and the drive module 153, and is used for, when detecting that the second control module 151 is deadlocked, controlling the drive module 153 to drive the power module PM to turn off through the conversion module 152, or directly controlling the drive module 153 to drive the power module PM to turn off.

[0098] Specifically, the deadlock monitoring module 154 continuously monitors whether the second control module 151 is deadlocked. When the second control module 151 is deadlocked, the deadlock monitoring module 154 outputs a deadlock locking signal to the conversion module 152 to let it perform related actions such as wave locking. Among them, the conversion module 152 can be a chip, a level conversion module, a NOT gate, etc., which can play a role in wave locking; the deadlock locking signal can also be directly given to the drive module 153 to perform related wave locking operations, but it is required that this drive module 153 has a primary-side ASC (Active Short Circuit) function.

[0099] As an implementation, as Figures 8 - 10 shown, the second control module 151 can also be connected to the conversion module 152, and the conversion module 152 can convert the PWM wave output by the second control module 151 to control the drive module 153 to drive the power module PM to turn off.

[0100] In some embodiments of the present invention, as Figure 10 、 Figures 12 - 14As shown, the motor control system 100 further includes: a third control device 160 and a power supply device 170. The power supply device 170 includes a first power supply module 171. The input end of the first power supply module 171 is used to connect to the battery, and the output end of the first power supply module 171 is connected to the drive module 153. The first power supply module 171 is used to convert the first voltage provided by the battery into a second voltage to supply power to the drive module 153. The third control device 160 is connected to the first power supply module 171, and is used to monitor the first power supply module 171, and when it is detected that the first power supply module 171 is abnormal, control the drive module 153 to drive the power module PM to turn off.

[0101] Specifically, the monitoring of the primary power supply of the drive module 153 (i.e., the first power supply module 171) can be increased. The third control device 160 for realizing this monitoring can be implemented by a logic circuit or a chip. When the third control device 160 detects that the output voltage of the first power supply module 171 is abnormal and controls the drive module 153 to drive the power module PM to turn off, it may include: the third control device 160 outputs an ASC signal to the high-voltage side ASC pin of the drive module 153 to implement operations such as directly turning off the wave on the high-voltage side in an emergency, without relying on the signal of the low-voltage end of the drive module 153 to control the PWM, thus realizing the second path of emergency shutdown. Among them, the first power supply module 171 can adopt a DC-DC structure or an integrated circuit (chip), and its main function is DC voltage conversion. The first voltage, that is, the voltage of the battery 10, such as 12V, and the second voltage is the voltage required for the drive module 153 to work, such as 3.3V, 5V, etc.

[0102] In some examples, such as Figure 11 As shown, the third control device 160 includes: a power supply monitoring module 161 and an isolation module 162.

[0103] Among them, the power supply monitoring module 161 is connected to the first power supply module 171, and is used to monitor the first power supply module 171, and when it is detected that the first power supply module 171 is abnormal, output a power supply abnormal protection signal to the isolation module 162. The isolation module 162 is used to output an active short-circuit signal (i.e., ASC signal) to the drive module 153 when receiving the power supply abnormal protection signal, so as to control the drive module 153 to drive the power module PM to turn off.

[0104] The isolation module 162 can separate the high-voltage area and the low-voltage area, and the power supply monitoring module 161 monitors the voltage of the low-voltage side of the drive module 153. Through the settings of the power supply monitoring module 161 and the isolation module 162, the reliability of protection through low-voltage power supply monitoring can be improved.

[0105] In some embodiments, refer to Figure 11, the first control module 142 is also respectively connected to the second control module 151, the power supply monitoring module 161, and the isolation module 162, and is further configured to determine the fault level of the motor control system according to the communication situation with the second control module 151, whether a power supply abnormal protection signal or an active short - circuit signal is received.

[0106] Specifically, refer to Figure 11 , the motor control system 100 is provided with three - level protection, which is specifically as follows:

[0107] The first - level protection is that the second control module 151 collects information such as three - phase current, bus voltage, terminal voltage, and speed, reads error information such as upper - bridge error, lower - bridge error, over - voltage error, and over - current error. The second control module 151 controls the drive module 153 to turn off the normal power module PM through three - phase short - circuit and six - phase open - circuit, etc.; and when the second control module 151 crashes, a crash lock - wave signal is formed, and the crash lock - wave signal is given to the primary side ASC pin of the conversion module 152 or the drive module 153 to control the drive module 153 to turn off the power module PM.

[0108] The second - level protection is that when the first - level protection fails to control the drive module 153 due to the failure of the primary - side power supply (i.e., the first power supply module 171) of the drive module 153, the power supply monitoring module 161 recognizes the abnormality, and through the isolation module 162, forms a high - voltage - side ASC signal and inputs it to the high - voltage end of the drive module 153 to control the reliable turn - off of the power module PM.

[0109] The third - level protection is the ultimate protection started when both the first - level protection and the second - level protection fail to cut off the motor electric control circuit, form an uncontrollable circuit loop, and the duration is long and the phase current is large, etc., which will cause serious consequences. After the ultimate protection is started, the first control module 142 outputs a trigger signal to the ignition module 141 to drive the phase - line cutting device 110 to start, and through the phase - line cutting device 110, cut off the physical connection of at least two of the three - phase lines, such as cutting off at least two of the copper bars connecting the motor electric control to the three - phase copper bars, so that the motor electric control cannot form a loop, thereby achieving the cutting of the energy loop.

[0110] In some embodiments of the present invention, the electric control ultimate protection is achieved by cutting off the three-phase lines connected to the motor M through the phase line cutting device 110. The control of the phase line cutting device 110 is specifically controlled by an independent first control device 140 for safety. Therefore, the power supply design of the safety module (including the phase line cutting device 110 and the first control device 140) is a dual power supply, which are respectively the low-voltage power (the first voltage) provided by the vehicle battery 10 and the high-voltage power (the third voltage) provided by the vehicle power battery. The third voltage is converted into the first voltage through the voltage conversion module, and the two power supplies supply power to the safety module simultaneously. Moreover, the low-voltage power provided by the vehicle battery 10 for powering the normal control and drive module 153 and for powering the safety module is separated by a diode to avoid mutual influence between the two loads.

[0111] Specifically, in some examples, such as Figure 12 shown, the input end of the first power supply module 171 is connected to the battery 10 through the first reverse protection diode D1. The power supply device 170 further includes: a voltage conversion module 172, a second power supply module 173, and a third power supply module 174.

[0112] Among them, the input end of the voltage conversion module 172 is connected to the power battery Bat, and is used to convert the third voltage (such as 600V) output by the power battery Bat into the first voltage (such as 12V); the input end of the second power supply module 173 is connected to the battery 10, and is used to convert the first voltage output by the battery 10 into the fourth voltage (such as 5V) to supply power to the second control module 151; the input end of the third power supply module 174 is connected to the battery 10 through the second reverse protection diode D2 and is connected to the output end of the voltage conversion module 172 through the third reverse protection diode D3, and is used to convert the first voltage output by the battery 10 or the voltage conversion module 172 into the fifth voltage (such as 5V) to supply power to the first control module 142. In addition, the ignition module 141 and the phase line cutting device 110 are connected to the battery 10 through the second reverse protection diode D2 and are connected to the output end of the voltage conversion module 172 through the third reverse protection diode D3.

[0113] In this example, referring to Figure 12 , the safety module is powered by an independent dual power supply. The normal drive control module (including the drive module 153 and the second control module 151) is powered by the battery 10, while the safety module is powered by the low-voltage power converted by the power battery Bat through the voltage conversion module 172 (which can use a transformer) and the battery 10 with a dual power supply. The dual power supply function of the safety module can, to a certain extent, keep the safety module in a normal power supply state. The power supply of the safety module is independent of the power supply of the normal drive control module, preventing the abnormal situation of the normal drive control module from affecting the power supply of the safety module. Anti-reverse diodes are respectively connected in series on the power supply lines of the battery 10 to the normal drive control module and the safety module to prevent the current from flowing reversely between the two.

[0114] In some examples, such as Figure 13 shown, based on the example Figure 12 shown, the input end of the first power supply module 171 is further connected to the output end of the voltage conversion module 172 through a fourth reverse protection diode D4. In addition, the ignition module 141 and the phase line cut-off device 110 are connected to the battery through a second reverse protection diode D2 and are connected to the output end of the voltage conversion module 172 through a third reverse protection diode D3.

[0115] In this example, both the safety module and the drive module 153 are powered by dual power supplies, but they are separated by a reverse protection diode. When the first power supply module 171 is abnormal, an ASC signal can be output through the third control device 160 to implement protection measures for the lower bridge three-phase short circuit or six-phase open circuit of the drive power module PM, that is, to implement the above-mentioned secondary protection.

[0116] In some examples, such as Figure 14 shown, the input end of the first power supply module 171 is sequentially connected to the battery 10 through a fifth reverse protection diode D5 and a second reverse protection diode D2. The power supply device 170 further includes: a voltage conversion module 172, a second power supply module 173, and a third power supply module 174.

[0117] Among them, the input end of the voltage conversion module 172 is connected to the power battery Bat and is used to reduce the third voltage output by the power battery Bat to the first voltage. Among them, the input end of the first power supply module 171 is also sequentially connected to the output end of the voltage conversion module 172 through a fifth reverse protection diode D5 and a third reverse protection diode D3. The input end of the second power supply module 173 is sequentially connected to the battery 10 through a sixth reverse protection diode D6 and a second reverse protection diode D2, and is sequentially connected to the output end of the voltage conversion module 172 through a sixth reverse protection diode D6 and a third reverse protection diode D3. The second power supply module 173 is used to convert the first voltage output by the battery 10 or the voltage conversion module 172 into a fourth voltage to supply power to the second control module 151. The input end of the third power supply module 174 is connected to the battery 10 through a second reverse protection diode D2 and is connected to the output end of the voltage conversion module 172 through a third reverse protection diode D3, and is used to convert the first voltage output by the battery 10 or the voltage conversion module 172 into a fifth voltage to supply power to the first control module 142. In addition, the ignition module 141 and the phase line cut-off device 110 are connected to the battery through a second reverse protection diode D2 and are connected to the output end of the voltage conversion module 172 through a third reverse protection diode D3.

[0118] In this example, both the safety module and the normal drive control module (including the drive module 153 and the second control module 151) are powered by dual power supplies. When the power supply of the battery 10 is abnormal, the high voltage of the power battery Bat can be converted to low voltage to continue to supply power to the safety module and the normal drive control module. The safety module and the normal drive control module are separated by an anti-reverse diode to reduce the mutual influence between the modules.

[0119] It should be noted that the drive module 153 can be divided into a first drive sub-module and a second drive sub-module corresponding to the upper bridge arm and the lower bridge arm of the power module PM. Correspondingly, the first power supply module 171 can also be divided into a first power supply sub-module and a second power supply sub-module, as Figure 14 shown. Whether to divide specifically can be set according to needs.

[0120] The motor control system of the embodiment of the present invention can achieve three-level protection, and when in ultimate protection, at least two of the three-phase lines can be cut off through the phase line cutting device, thereby reducing or avoiding the risk of arcing or even open fire caused by serious motor control system failures. Moreover, by powering the safety module with dual power supplies, the reliability of ultimate protection can be improved.

[0121] Figure 15 is a flowchart of the motor control method of the embodiment of the present invention.

[0122] In this embodiment, the motor control method is used for a motor control system. The system includes a motor, a power module, and a phase line cutting device. The DC side of the power module is provided with a DC bus for connecting the power battery. A DC side fuse is provided on the DC bus. The AC side of the power module is connected to the motor through three-phase lines. The phase line cutting device is provided corresponding to at least two of the three-phase lines.

[0123] As Figure 15 shown, the motor control method includes:

[0124] S151, when at least one of the disconnection of the DC side fuse and the occurrence of a bridge arm short circuit fault in the power module occurs, and the speed of the motor is greater than the first preset speed, cut off at least two of the three-phase lines.

[0125] Wherein, the DC side of the power module is provided with a DC bus for connecting the power battery. A DC side fuse is provided on the DC bus. The AC side of the power module is connected to the motor through three-phase lines.

[0126] In some embodiments of the present invention, before cutting off at least two of the three-phase lines, the method further includes: determining that the phase current of the motor is greater than the first preset current and lasts for more than the first preset time.

[0127] In some embodiments of the present invention, before cutting at least two of the three-phase lines, the method further includes: determining that the duration of the short circuit of the bridge arm of the power module is greater than a second preset time.

[0128] In some embodiments of the present invention, before cutting at least two of the three-phase lines, the method further includes: determining that the temperature of the power module is greater than a first preset temperature.

[0129] In some embodiments of the present invention, before cutting at least two of the three-phase lines, the method further includes: determining that a new energy vehicle where the motor is located has a collision with a severity level greater than a preset level.

[0130] It should be noted that for other specific implementation manners of the motor control method in the embodiments of the present invention, reference may be made to the specific implementation manners of the motor control system in the above embodiments.

[0131] Based on the motor control method of the above embodiments, the present invention proposes a computer-readable storage medium.

[0132] In this embodiment, a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the motor control method of the above embodiments is implemented.

[0133] Figure 16 It is a structural block diagram of a new energy vehicle according to an embodiment of the present invention.

[0134] As Figure 16 shown, the new energy vehicle 200 includes: a power battery Bat and the motor control system 100 of the above embodiment.

[0135] The motor control system, method, storage medium, and new energy vehicle of the embodiments of the present invention can achieve three-level protection, and when in ultimate protection, at least two of the three-phase lines can be cut off by the phase line cutting device, thereby reducing or avoiding the risk of arcing or even open fire caused by serious motor control system failures. Moreover, by supplying power to the safety module with dual power sources, the reliability of ultimate protection can be improved.

[0136] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in combination with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of the computer-readable medium include the following: an electrical connection part having one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0137] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0138] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0139] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0140] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0141] In the present invention, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0142] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0143] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A motor control system (100), characterized in that, It includes a motor (M) and a power module (PM). A DC bus is provided at the DC end of the power module (PM) for connecting to a power battery (Bat). A DC side fuse (FU) is provided on the DC bus. The AC end of the power module (PM) is connected to the motor (M) through three-phase lines. The motor control system (100) further includes: Phase line cut-off devices (110), provided corresponding to at least two of the three-phase lines; Detection devices (120), configured to detect first operation information, second operation information, and third operation information. The first operation information includes the arm fault condition of the power module. The second operation information includes the connection condition of the DC side fuse (FU). The third operation information includes the rotational speed of the motor (M); A first control device (140), respectively connected to the phase line cut-off devices (110) and the detection devices (120), and configured to control the phase line cut-off devices (110) to cut off at least two of the three-phase lines when the DC side fuse (FU) is disconnected, a bridge arm short circuit fault occurs in the power module (PM), and the rotational speed of the motor (M) is greater than a first preset rotational speed.

2. The motor control system (100) according to claim 1, wherein The third operation information further includes the phase current of the motor (M). The first control device (140) is configured to control the phase line cut-off devices (110) to cut off at least two of the three-phase lines when the DC side fuse (FU) is disconnected, the rotational speed of the motor (M) is greater than the first preset rotational speed, and the phase current of the motor (M) is greater than a first preset current and lasts for more than a first preset time.

3. The motor control system (100) according to claim 1, characterized in that, The detection devices (120) are at least configured to detect the bus voltage difference across the DC side fuse (FU), and determine that the DC side fuse (FU) is disconnected when the bus voltage difference across the DC side fuse (FU) is greater than a first voltage threshold; and / or, The detection devices (120) are at least configured to detect the bus current of the DC bus where the DC side fuse (FU) is located, and determine that the DC side fuse (FU) is disconnected when the bus current is less than a first current threshold.

4. The motor control system (100) according to claim 1, wherein The first control device (140) is configured to control the phase line cut-off devices (110) to cut off at least two of the three-phase lines when a bridge arm short circuit fault occurs in the power module (PM) and lasts for more than a second preset time, and the rotational speed of the motor (M) is greater than the first preset rotational speed.

5. The motor control system (100) according to claim 1, characterized in that, The second operation information further includes the temperature of the power module (PM). Before controlling the phase line cut-off devices (110) to cut off at least two of the three-phase lines, the first control device (140) is further configured to determine that the temperature of the power module (PM) is greater than a first preset temperature.

6. The motor control system (100) according to claim 1, characterized in that, The first operation information further includes the collision condition of the new energy vehicle where the motor control system (100) is located. Before controlling the phase line cut-off devices (110) to cut off at least two of the three-phase lines, the first control device (140) is further configured to determine that the new energy vehicle has a collision with a severity level greater than a preset level.

7. The motor control system (100) according to claim 1, wherein, The first control device (140) includes: The ignition module (141) is connected to the phase line cutting device (110); The first control module (142) is respectively connected to the ignition module (141) and the detection device (120), and is configured to, when the DC side fuse (FU) is disconnected, a bridge arm short circuit fault occurs in the power module (PM), and the rotation speed of the motor (M) is greater than a first preset rotation speed, control the phase line cutting device (110) to cut at least two of the three phase lines through the ignition module (141).

8. The motor control system (100) according to claim 7, wherein The motor control system (100) further includes a second control device (150), and the second control device (150) includes: a second control module (151) and a drive module (153); wherein, The second control module (151) is respectively connected to the detection device (120) and the drive module (153), and is configured to, when any one of the DC side fuse (FU) being disconnected, a bridge arm fault occurring in the power module (PM), and the rotation speed of the motor (M) being greater than a second preset rotation speed occurs, control the drive module (153) to drive the power module (PM) to turn off, wherein the second preset rotation speed is less than or equal to the first preset rotation speed.

9. The motor control system (100) according to claim 8, characterized in that, The second control device (150) further includes: A conversion module (152) is connected to the control end of the power module (PM) through the drive module (153); A deadlock monitoring module (154) is respectively connected to the second control module (151), the conversion module (152), and the drive module (153), and is configured to, when it is monitored that the second control module (151) is deadlocked, control the drive module (153) to drive the power module (PM) to turn off through the conversion module (152), or directly control the drive module (153) to drive the power module (PM) to turn off.

10. The motor control system (100) according to claim 8 or 9, characterized in that, The motor control system (100) further includes: A power supply device (170) includes a first power supply module (171), an input end of the first power supply module (171) is used to connect to the storage battery (10), an output end of the first power supply module (171) is connected to the drive module (153), and the first power supply module (171) is configured to convert a first voltage provided by the storage battery (10) into a second voltage to supply power to the drive module (153); A third control device (160) is connected to the first power supply module (171), and is configured to monitor the first power supply module (171), and when it is monitored that the first power supply module (171) is abnormal, control the drive module (153) to drive the power module (PM) to turn off.

11. The motor control system (100) according to claim 10, characterized in that, The third control device (160) includes: A power supply monitoring module (161) is connected to the first power supply module (171), and is configured to monitor the first power supply module (171), and when it is monitored that the first power supply module (171) is abnormal, output a power supply abnormal protection signal to the isolation module (162); The isolation module (162) is configured to output an active short - circuit signal to the drive module (153) when receiving the power - supply abnormal protection signal, so as to control the drive module (153) to drive the power module (PM) to turn off.

12. The motor control system (100) according to claim 11, wherein, The first control module (142) is further respectively connected to the second control module (151), the power - supply monitoring module (161) and the isolation module (162), and is further configured to determine that at least one of a communication abnormality with the second control module (151), receiving the power - supply abnormal protection signal, and receiving the active short - circuit signal occurs before controlling the phase - wire cutting device to cut off at least two of the three phase wires.

13. The motor control system (100) according to claim 10, wherein The input end of the first power - supply module (171) is connected to the storage battery (10) through a first reverse - protection diode (D1). The power - supply device (170) further includes: A voltage - conversion module (172), the input end of the voltage - conversion module (172) is connected to the power battery (Bat), and is configured to step down the third voltage output by the power battery (Bat) to the first voltage; A second power - supply module (173), the input end of the second power - supply module (173) is connected to the storage battery (10), and is configured to convert the first voltage output by the storage battery (10) into a fourth voltage to supply power to the second control module (151); A third power - supply module (174), the input end of the third power - supply module (174) is connected to the storage battery (10) through a second reverse - protection diode (D2) and is connected to the output end of the voltage - conversion module (172) through a third reverse - protection diode (D3), and is configured to convert the first voltage output by the storage battery (10) or the voltage - conversion module (172) into a fifth voltage to supply power to the first control module (142).

14. The motor control system (100) according to claim 13, wherein, The input end of the first power - supply module (171) is further connected to the output end of the voltage - conversion module (172) through a fourth reverse - protection diode (D4).

15. The motor control system (100) according to claim 10, characterized in that, The input end of the first power - supply module (171) is sequentially connected to the storage battery (10) through a fifth reverse - protection diode (D5) and the second reverse - protection diode (D2). The power - supply device (170) further includes: A voltage - conversion module (172), the input end of the voltage - conversion module (172) is connected to the power battery (Bat), and is configured to step down the third voltage output by the power battery (Bat) to the first voltage, wherein the input end of the first power - supply module (171) is further sequentially connected to the output end of the voltage - conversion module (172) through the fifth reverse - protection diode (D5) and the third reverse - protection diode (D3); A second power supply module (173), the input end of the second power supply module (173) is sequentially connected to the storage battery (10) through a sixth reverse protection diode (D6) and the second reverse protection diode (D2), and is sequentially connected to the output end of the voltage conversion module (172) through the sixth reverse protection diode (D6) and the third reverse protection diode (D3). The second power supply module (173) is configured to convert a first voltage output by the storage battery (10) or the voltage conversion module (172) into a fourth voltage to supply power to the second control module (151). A third power supply module (174), the input end of the third power supply module (174) is connected to the storage battery (10) through the second reverse protection diode (D2), and is connected to the output end of the voltage conversion module (172) through the third reverse protection diode (D3), and is configured to convert the first voltage output by the storage battery (10) or the voltage conversion module (172) into a fifth voltage to supply power to the first control module (142).

16. The motor control system (100) according to any one of claims 13-15, characterized in that, The ignition module (141) and the phase line cutting device (110) are connected to the storage battery (10) through the second reverse protection diode (D2), and are connected to the output end of the voltage conversion module (172) through the third reverse protection diode (D3).

17. A motor control method, characterized in that, Comprising: When the DC side fuse is disconnected and a bridge arm short circuit fault occurs in the power module, and the speed of the motor is greater than a first preset speed, at least two of the three-phase lines are cut off. Wherein, a DC bus is provided at the DC end of the power module for connecting a power battery, and the DC side fuse is provided on the DC bus. The AC end of the power module is connected to the motor through the three-phase lines.

18. The motor control method according to claim 17, wherein, Before cutting off at least two of the three-phase lines, the method further includes: Determining that the phase current of the motor is greater than a first preset current and lasts for more than a first preset time.

19. The motor control method according to claim 17, characterized in that, Before cutting off at least two of the three-phase lines, the method further includes: Determining that the duration of the bridge arm short circuit in the power module is greater than a second preset time.

20. The motor control method according to claim 17, characterized in that, Before cutting off at least two of the three-phase lines, the method further includes: Determining that the temperature of the power module is greater than a first preset temperature.

21. The motor control method according to claim 17, characterized in that, Before cutting off at least two of the three-phase lines, the method further includes: Determining that the new energy vehicle where the motor is located has a collision with a severity level greater than a preset level.

22. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the motor control method according to any one of claims 17-21.

23. A new energy vehicle (200), characterized in that, Comprising: A power battery (Bat) and the motor control system (100) according to any one of claims 1-16.

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