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

Abstract

Provided are a motor control system and method, a storage medium, and a new energy vehicle, relating to the technical field of new energy vehicles. The system comprises: a motor; a power module, wherein a direct-current end of the power module is provided with a direct-current bus to be connected to a power battery, the direct-current bus is provided with a direct-current side fuse, and an alternating-current end is connected to the motor by means of three phase lines; a phase line interruption apparatus arranged corresponding to at least two phase lines among the three phase lines; a detection apparatus used for detecting at least one of a leg fault condition of the power module and a connection condition of the direct-current side fuse, and used for measuring the speed of the motor; and a first control apparatus used for controlling, upon occurrence of at least one of a disconnection of the direct-current side fuse and a leg short-circuit fault in the power module and when the speed of the motor is greater than a first preset speed, the phase line interruption apparatus to interrupt at least two phase lines among the three phase lines.

Description

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

[0001] Related applications

[0002] The present application claims priority from a Chinese patent application No. 2024107355304, filed on June 7, 2024, and entitled "Motor control system, method and storage medium, and new energy vehicle". TECHNICAL FIELD

[0003] The present application relates to the technical field of new energy vehicles, and in particular to a motor control system, method and storage medium, and new energy vehicle. BACKGROUND

[0004] In related technologies, the resistance of abnormal energy control is generally enhanced to some extent by optimizing the device selection parameters or raw materials used by components in the motor control system. However, in the above-mentioned technology, the motor drive circuit is always connected, so that in some fault conditions, other energy feedback paths may be formed, causing the existence of long-time or abnormal large current, thereby causing secondary damage to the device, and finally causing the device to explode or insulation failure to produce arc or open fire and other serious consequences. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the related art. To this end, the purpose of the present application is to provide a motor control system, method and storage medium, and new energy vehicle, so as to reduce or avoid the risk of arc or even open fire caused by serious motor control system failure.

[0006] In a first aspect, the present application provides a motor control system, comprising a motor and a power module, a direct current bus is arranged on a direct current end of the power module to connect a power battery, a direct current side fuse is arranged on the direct current bus, an alternating current end of the power module is connected with the motor through three-phase lines, the system further comprises: a phase line cutting device, which is arranged corresponding to at least two phases of the three-phase lines; a detection device, which is used to detect at least one of first operating information and second operating information, and is used to detect third operating information, the first operating information comprises a bridge arm fault condition of the power module, the second operating information comprises a connection condition of the direct current side fuse, and the third operating information comprises a rotating speed of the motor; and a first control device, which is connected with the phase line cutting device and the detection device respectively, and is used to control the phase line cutting device to cut off at least two phases of the three-phase lines when at least one of the direct current side fuse is disconnected and the power module appears a bridge arm short circuit fault, and the rotating speed of the motor is greater than a first preset rotating speed.

[0007] In addition, the motor control system of the embodiment of the present application can further have the following additional technical features.

[0008] According to an embodiment of the present application, the third operation information further comprises phase current of the motor, and the first control device is configured to control the phase line cutting device to cut off at least two of the three phase lines when the DC side fuse is disconnected, the rotating speed of the motor is greater than a first preset rotating speed, and the phase current of the motor is greater than a first preset current and lasts for more than a first preset time.

[0009] According to an embodiment of the present application, the detection device is configured to detect at least 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 configured to detect at least bus current of a 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.

[0010] According to an embodiment of the present application, the first control device is configured to control the phase line cutting device to cut off at least two of the three phase lines when the bridge arm short circuit fault of the power module lasts for more than a second preset time, and the rotating speed of the motor is greater than the first preset rotating speed.

[0011] According to an embodiment of the present application, the second operation information further comprises temperature of the power module (PM), and the first control device is further configured to determine that the temperature of the power module is greater than a first preset temperature before controlling the phase line cutting device to cut off at least two of the three phase lines.

[0012] According to an embodiment of the present application, the first operation information further comprises collision condition of a new energy vehicle where the motor control system is located, and the first control device is further configured to determine that the new energy vehicle has a collision with a severity greater than a preset severity before controlling the phase line cutting device to cut off at least two of the three phase lines.

[0013] According to an embodiment of the present application, the first control device comprises: an ignition module connected with the phase line cutting device; and a first control module connected with the ignition module and the detection device, respectively, and configured to control the phase line cutting device to cut off at least two of the three phase lines through the ignition module when at least one of the DC side fuse is disconnected and the bridge arm short circuit fault of the power module occurs.

[0014] According to one of the embodiments of the present application, the system further comprises a second control device, which comprises a second control module and a driving module; wherein the second control module is connected with the detection device and the driving module respectively, and is configured to control the driving module to drive the power module to shut down when the DC side fuse is disconnected, a bridge arm fault of the power module occurs, or the rotating speed of the motor is greater than a second preset rotating speed, wherein the second preset rotating speed is less than or equal to the first preset rotating speed.

[0015] According to one of the embodiments of the present application, the second control device further comprises a conversion module connected with the control end of the driving module and the power module, and a dead machine monitoring module connected with the second control module, the conversion module and the driving module respectively, and configured to control the driving module to drive the power module to shut down through the conversion module or directly control the driving module to drive the power module to shut down when the second control module is found to be dead.

[0016] According to one of the embodiments of the present application, the system further comprises a power supply device comprising a first power supply module, wherein the input end of the first power supply module is connected with a storage battery, the output end of the first power supply module is connected with 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; and a third control device connected with the first power supply module, and configured to monitor the first power supply module and control the driving module to drive the power module to shut down when the first power supply module is found to be abnormal.

[0017] According to one of the embodiments of the present application, the third control device comprises a power supply monitoring module connected with the first power supply module, and configured to monitor the first power supply module and output a power supply abnormality protection signal to an isolation module when the first power supply module is found to be abnormal; and the isolation module is configured to output an active short-circuit signal to the driving module to control the driving module to drive the power module to shut down when the power supply abnormality protection signal is received.

[0018] According to one of the embodiments of the present application, the first control module is further connected with the second control module, the power supply monitoring module and the isolation module respectively, and is further configured to determine that at least one of the following occurs before controlling the phase line cutting device to cut off at least two of the three phase lines: communication abnormality with the second control module, the power supply abnormality protection signal is received, and the active short-circuit signal is received.

[0019] According to one embodiment of the present application, the input end of the first power supply module is connected with the battery through a first anti-reverse diode, and the power supply device further comprises: a voltage conversion module, the input end of which is connected with the power battery, for reducing the third voltage output by the power battery to the first voltage; a second power supply module, the input end of which is connected with the battery, for converting the first voltage output by the battery to the fourth voltage to supply power to the second control module; and a third power supply module, the input end of which is connected with the battery through a second anti-reverse diode and with the output end of the voltage conversion module through a third anti-reverse diode, for converting the first voltage output by the battery or the voltage conversion module to the fifth voltage to supply power to the first control module.

[0020] According to one embodiment of the present application, the input end of the first power supply module is further connected with the output end of the voltage conversion module through a fourth anti-reverse diode.

[0021] According to one embodiment of the present application, the input end of the first power supply module is connected with the battery through a fifth anti-reverse diode and a second anti-reverse diode in sequence, and the power supply device further comprises: a voltage conversion module, the input end of which is connected with the power battery, for reducing the third voltage output by the power battery to the first voltage, wherein the input end of the first power supply module is further connected with the output end of the voltage conversion module through the fifth anti-reverse diode and a third anti-reverse diode in sequence; a second power supply module, the input end of which is connected with the battery through a sixth anti-reverse diode and the second anti-reverse diode in sequence and with the output end of the voltage conversion module through the sixth anti-reverse diode and the third anti-reverse diode in sequence, the second power supply module being used for converting the first voltage output by the battery or the voltage conversion module to the fourth voltage to supply power to the second control module; and a third power supply module, the input end of which is connected with the battery through the second anti-reverse diode and with the output end of the voltage conversion module through the third anti-reverse diode, for converting the first voltage output by the battery or the voltage conversion module to the fifth voltage to supply power to the first control module.

[0022] According to one embodiment of the present application, the ignition module and the phase line cutting device are connected with the battery through the second anti-reverse diode and with the output end of the voltage conversion module through the third anti-reverse diode.

[0023] In a second aspect, an embodiment of the present application provides a motor control method, comprising: when at least one of a DC side fuse disconnection and a bridge arm short circuit fault of a power module occurs, and a rotating speed of a motor is greater than a first preset rotating speed, cutting off at least two phase lines in three phase lines, wherein a DC bus is arranged on a DC end of the power module to connect a power battery, the DC bus is provided with the DC side fuse, and an AC end of the power module is connected with the motor through the three phase lines.

[0024] In addition, the motor control method of the embodiment of the present application can further have the following additional technical features:

[0025] According to an embodiment of the present application, before the at least two phase lines in the three phase lines are cut off, the method further comprises: determining that a phase current of the motor is greater than a first preset current and lasts for more than a first preset time.

[0026] According to an embodiment of the present application, before the at least two phase lines in the three phase lines are cut off, the method further comprises: determining that a duration of the bridge arm short circuit of the power module is greater than a second preset time.

[0027] According to an embodiment of the present application, before the at least two phase lines in the three phase lines are cut off, the method further comprises: determining that a temperature of the power module is greater than a first preset temperature.

[0028] According to an embodiment of the present application, before the at least two phase lines in the three phase lines are cut off, the method further comprises: determining that a new energy vehicle where the motor is located occurs a collision with a severity greater than a preset severity.

[0029] In a third aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the motor control method of the second aspect.

[0030] In a fourth aspect, an embodiment of the present application provides a new energy vehicle, comprising: a power battery and the motor control system of the first aspect.

[0031] The motor control system, method, storage medium and new energy vehicle of the embodiment of the present application can reduce or avoid the risk of arc or even open fire caused by serious motor control system failure by controlling the phase line cutting device to cut off at least two phase lines in the three phase lines when at least one of the bridge arm short circuit fault of the power module and the DC side fuse disconnection occurs, and the rotating speed of the motor is greater than the first preset rotating speed.

[0032] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1(a) is a structural schematic diagram of a four-wheel drive vehicle according to an example of the present application;

[0034] Fig. 1(b) is a structural schematic diagram of a front-wheel drive two-wheel drive vehicle according to an example of the present application;

[0035] Fig. 1(c) is a structural schematic diagram of a rear-wheel drive two-wheel drive vehicle according to an example of the present application;

[0036] Fig. 1(d) is a structural schematic diagram of a simple four-wheel drive vehicle according to an example of the present application;

[0037] Fig. 1(e) is a structural schematic diagram of an independent four-wheel drive vehicle according to an example of the present application;

[0038] Fig. 2 is a schematic diagram of an energy feedback current loop when an insurance damage occurs according to an example of the present application;

[0039] Fig. 3 is a schematic diagram of an energy feedback current loop when a short circuit damage of a certain bridge of a power module occurs according to an example of the present application;

[0040] Fig. 4 is a structural schematic diagram of a motor control system according to a first embodiment of the present application;

[0041] Fig. 5 is an action flowchart of a first control device according to an embodiment of the present application;

[0042] Fig. 6 is a structural schematic diagram of a motor control system according to a second embodiment of the present application;

[0043] Fig. 7 is a structural schematic diagram of a motor control system according to a third embodiment of the present application;

[0044] Fig. 8 is a structural schematic diagram of a motor control system according to a fourth embodiment of the present application;

[0045] Fig. 9 is a structural schematic diagram of a motor control system according to a fifth embodiment of the present application;

[0046] Fig. 10 is a structural schematic diagram of a motor control system according to a sixth embodiment of the present application;

[0047] Fig. 11 is a structural schematic diagram of a motor control system according to a seventh embodiment of the present application;

[0048] Fig. 12 is a power supply structural schematic diagram of a motor control system according to a first embodiment of the present application;

[0049] Fig. 13 is a power supply structural schematic diagram of a motor control system according to a second embodiment of the present application;

[0050] Fig. 14 is a power supply structural schematic diagram of a motor control system according to a third embodiment of the present application;

[0051] Fig. 15 is a flow chart of a motor control method according to an embodiment of the present application;

[0052] Fig. 16 is a structural block diagram of a new energy vehicle according to an embodiment of the present application.

[0053] BRIEF DESCRIPTION OF DRAWINGS 100, motor control system, 200, new energy vehicle; 110, phase line cutting device, 120, detection device, 140, first control device, 150, second control device, 160, third control device, 170, power supply device, 121, end overvoltage detection module, 122, bus overvoltage detection module, 123, overcurrent detection module, 124, OR module, 131, end 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, dead machine 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; 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 DESCRIPTION

[0054] Embodiments of the present application are described in detail below with reference to the attached drawings, which are examples of embodiments of the present application. The embodiments described below are examples and are intended to explain the present application, and should not be understood as limiting the present application.

[0055] Figures 1(a)-1(e) show the driving connection structures of different models of new energy vehicles. 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 two-wheel drive vehicles (as shown in Figure 1(b)), rear-wheel two-wheel drive vehicles (as shown in Figure 1(c)), simple 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 or rear-wheel drive or four-wheel drive according to whether the driving wheels are distributed in the front compartment or the rear compartment or both. When a new energy vehicle is being towed, if the driving wheels are forcibly driven, the driving wheels will drive the motor M to rotate, and the motor M will become a generator, at which time the new energy vehicle is in a power generation condition. When the new energy vehicle is a multi-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 failed motor drive system are driven to rotate, and the rotation of the wheels drives the motor M of the abnormal motor drive system to rotate, becoming a generator, at which time the abnormal motor drive system is in a power generation condition. In Figures 1(a)-1(e), the dashed arrows represent the mechanical energy flow, and the solid arrows represent the electrical energy flow.

[0056] In the case that the motor control system is not damaged, this power generation condition is a normal feedback condition, but when the motor control system is abnormal, normal control is no longer performed, the power module PM in the motor control system is open, and the current is passively rectified by the diode in the power module PM to flow to the power battery, charging the power battery Bat. However, in some cases, when the fuse of the abnormal driving source DC bus is blown, the wheels drive the motor M to generate power, and the 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, causing one or both to be damaged. In Figures 1(a)-1(e), FPM represents the power module corresponding to the front compartment, and RPM represents the power module corresponding to the rear compartment.

[0057] Figure 2 shows the energy feedback current loop when the DC side fuse FU is damaged. Referring 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 loop 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 will be rectified by the uncontrollable power module PM, and the current will flow to the bus capacitor C to charge the bus capacitor C. If the above-mentioned power generation condition continues, the capacitor capacity is limited, and the bus capacitor C will be full. At this time, there is no storage location for energy, and the bus voltage will gradually rise, which may exceed the allowable voltage value of the power module PM or the bus capacitor C, causing the power module PM or the bus capacitor C to be damaged.

[0058] In some cases, the state of the power module PM after abnormal damage is short circuit, at this time, the power module PM and the motor coil form a loop, and long-time current flow will cause secondary damage to the power module PM, which may cause serious consequences such as insulation failure and abnormal short circuit of the power module PM.

[0059] FIG. 3 shows an energy feedback current loop when a certain bridge arm of the power module PM is damaged by short circuit. Referring to FIG. 3, when one of the bridge arms 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 power generation working condition, the motor M and the abnormal short-circuit bridge arm of the power module PM will form a current loop, and the current will continue to circulate in the loop. If the generated power is large at this time, the loop circulating current will be large, and since there is no storage component in the loop current, the current may rise sharply or continue to run until the power module PM is damaged again, and may even cause serious consequences such as damage to the insulation layer and the generation of open fire.

[0060] Therefore, the present application provides a motor control system, which is provided with a phase line cutting device corresponding to the three-phase line connected between the motor and the power module, and when the motor control system fails seriously, the phase line cutting device is controlled to cut off at least two of the three-phase lines, so as to completely cut off the energy feedback path and eliminate the above risks.

[0061] The motor control system, method, storage medium and new energy vehicle of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0062] FIG. 4 is a structural block diagram of the motor control system of the first embodiment of the present application.

[0063] As shown in FIG. 4, the motor control system 100 comprises a motor M, a power module PM, a phase line cutting device 110, a detection device 120 and a first control device 140. The DC end of the power module PM is provided with a DC bus for connecting a power battery Bat, and the DC bus is provided with a DC side fuse FU (which can include one or more fuses, and in FIG. 4, one fuse is connected to the positive and negative ends of the DC side as an example). The AC end of the power module PM is connected to the motor M through three-phase lines. The phase line cutting device 110 is provided corresponding to at least two phases of the three-phase lines, the detection device 120 is used to detect at least one of first operating information (which can be operating information of the power module PM) and second operating information (which can be operating information of the motor control system 100 or the vehicle in which it is located, excluding the power module PM and the motor M), and is used to detect third operating information (which can be operating information of the motor M), the first operating information includes a bridge arm fault condition of the power module PM, the second operating information includes a connection condition of the DC side fuse FU, and the third operating information includes a speed of the motor M; the first control device 140 is connected to the phase line cutting device 110 and the detection device 120, respectively, and is used to determine that the fault level of the motor control system 100 is a preset highest level, such as high level, 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 speed of the motor M is greater than a first preset speed.

[0064] Among them, the first operating information can also include but is not limited to bus voltage, terminal voltage, etc. of the power module PM, and the third operating information can also include but is not limited to phase current, such as three-phase current, of the motor M; the bridge arm fault of the power module PM can be an upper bridge arm fault or a lower bridge arm fault, and the fault can be a short circuit fault.

[0065] In this embodiment, as an implementation manner, the processing flow of the first control device 140 is shown in FIG. 5. Referring to FIG. 5, when the first control device 140 receives an upper bridge error signal or a lower bridge error signal (generated due to a corresponding bridge arm short circuit fault), or detects that the DC side fuse FU is disconnected, the speed of the motor M can be obtained, and whether the fault level of the motor control system 100 is high level, i.e. whether the current conditions meet the conditions for starting the ultimate protection (cutting off at least two of the three-phase lines), is determined according to the speed, etc. For example, whether the speed is seriously abnormal (such as the speed of the motor M being greater than a first preset speed (such as greater than or equal to 3000 r / min)) is determined. 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 off at least two of the three-phase lines, so as to completely cut off the energy feedback path, thereby preventing the phenomenon of arc or open fire. 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 receiving and determining the fault.

[0066] In some embodiments of the application, the third operating information further comprises phase currents of the motor M, and 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 fuse FU on the DC side is disconnected, the speed of the motor M is greater than the first preset speed, and the phase currents of the motor M are greater than a first preset current (e.g., greater than or equal to 50 A) and last for more than a first preset time (e.g., 3 s).

[0067] In some embodiments of the application, as an implementation, the detection device 120 is configured to detect at least a bus voltage difference across the fuse FU on the DC side, and determine that the fuse FU on the DC side is disconnected when a target line voltage difference across the fuse FU on the DC side is greater than a first voltage threshold.

[0068] In some embodiments of the application, as an implementation, the detection device 120 is configured to detect at least a bus voltage difference across the fuse FU on the DC side, and determine that the fuse FU on the DC side is disconnected when a target line voltage difference across the fuse FU on the DC side is greater than a first voltage threshold.

[0069] In some embodiments of the application, as an implementation, the detection device 120 is configured to detect at least a bus voltage difference across the fuse FU on the DC side, and determine that the fuse FU on the DC side is disconnected when a target line voltage difference across the fuse FU on the DC side is greater than a first voltage threshold.

[0070] In some embodiments of the application, as an implementation, the detection device 120 is configured to detect at least a bus voltage difference across the fuse FU on the DC side, and determine that the fuse FU on the DC side is disconnected when a target line voltage difference across the fuse FU on the DC side is greater than a first voltage threshold.

[0071] In some embodiments of the application, as an implementation, the detection device 120 is configured to detect at least a bus voltage difference across the fuse FU on the DC side, and determine that the fuse FU on the DC side is disconnected when a target line voltage difference across the fuse FU on the DC side is greater than a first voltage threshold.

[0072] In some embodiments of the application, 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 a bridge arm short circuit of the power module PM lasts for more than a second preset time (e.g., 330 ms) and the speed of the motor M is greater than the first preset speed.

[0073] In some embodiments of the present application, the second operating information further comprises a temperature of the power module PM, and 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 before controlling the phase line cutting device 110 to cut at least two of the three phase lines.

[0074] By adding the temperature judgment, the reliability of the judgment of whether the motor control system has a serious fault can be improved.

[0075] In some embodiments of the present application, the first operating information further comprises a collision condition of a new energy vehicle in which the motor control system 100 is located, and the first control device 140 is further configured to determine that the new energy vehicle has a collision with a severity greater than a preset severity before controlling the phase line cutting device 110 to cut at least two of the three phase lines.

[0076] By adding the judgment of whether the new energy vehicle has a collision with a severity greater than a preset severity, the reliability of the judgment of whether the motor control system has a serious fault can be improved.

[0077] In some embodiments of the present application, as shown in FIG. 6, the first control device 140 comprises an ignition module 141 and a first control module 142.

[0078] The ignition module 141 is connected with the phase line cutting device 110, and the first control module 142 is connected with the ignition module 141 and the detection device 120, respectively, and is configured to control the phase line cutting device 110 to cut at least two of the three phase lines through the ignition module 141 when at least one of the following conditions is met: 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 a first preset rotational speed. Of course, the first control module 142 can also be configured to control the phase line cutting device 110 to cut at least two of the three phase lines through the ignition module 141 when the conditions for the first control device 140 to control the phase line cutting device 110 to cut at least two of the three phase lines are met.

[0079] In this embodiment, the first control module 142 can be a CPLD (Complex Programmable logic device). The ignition module 141 can be independently provided with the first control module 142, or can be integrally provided with the first control module 142. FIG. 6 illustrates an independent setting. Compared with the integrated setting, the independent setting is easier to implement and has better flexibility. The ignition module 141 can be a kind of driving chip, which can convert the mA-level current of the first control module 142 into an A-level current, and monitor whether the phase line cutting device 110 is normal, such as detecting the internal resistance of the phase line cutting device 110, giving a current to the internal resistance, and judging whether the phase line cutting device 110 is normal according to the received voltage value.

[0080] In some embodiments of the application, as shown in FIG. 7, the motor control system 100 further comprises a second control device 150, which comprises a second control module 151 and a driving module 153.

[0081] The second control module 151 is connected with the detection device 120 and the driving module 153, respectively, and is configured to determine that the fault level of the motor control system 100 is a 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 rotating speed of the motor M is greater than a second preset rotating speed, and at this time, the power module PM is turned off by controlling the driving module 153. The second preset rotating speed is less than or equal to the first preset rotating speed.

[0082] Specifically, the second control module 151 can adopt a DSP (Digital Signal Processing) chip. The DSP chip can collect the bridge arm fault signal of the power module PM, the phase current and the rotating speed of the motor M, the connection condition of the DC side fuse FU, and the like, and when any one of the DC side fuse FU being disconnected, the power module PM having a bridge arm fault, and the rotating speed of the motor M being greater than the second preset rotating speed is detected, the DSP chip outputs PWM waves (such as 6 PWM waves, corresponding to 6 bridge arms of the power module PM) to the driving module 153, the normal driving is interrupted, and the corresponding fault response action is performed in the fault processing program, such as driving the power module PM to be turned off. The condition for the first control module 142 to control the phase line cutting device 110 to cut off at least two phases of the three-phase line through the ignition module 141 is more stringent than the condition for the second control module 151 to control the driving module 153 to drive the power module PM to be turned off, and the condition is not limited to the above, and can be set according to the needs.

[0083] In some examples, as shown in FIGS. 8 and 9, the detection device 120 comprises a fuse sampling module (not shown in FIGS. 8 and 9), a current sampling module 134, a rotating speed sampling module (not shown in FIGS. 8 and 9), an upper bridge fault detection module (not shown in FIGS. 8 and 9), and a lower bridge fault detection module (not shown in FIGS. 8 and 9).

[0084] The insurance sampling module is connected with the first control module 142 and the second control module 151 respectively, and is used for sampling a voltage difference between the DC side insurance FU and / or a bus current of a DC bus where the voltage difference and the bus current are sent to the first control module 142 and the second control module 151 respectively; the current sampling module 134 is connected with the first control module 142 and the second control module 151 respectively, and is used for sampling phase currents of the motor, and the phase currents are sent to the first control module 142 and the second control module 151 respectively; the speed sampling module is connected with the first control module 142 and the second control module 151 respectively, and is used for sampling a speed of the motor M, and the speed is sent to the first control module 142 and the second control module 151 respectively; the upper bridge fault detection module is connected with the upper bridge arm of the power module PM, the first control module 142 and the second control module 151 respectively, and is used for outputting an upper bridge error signal to the first control module 142 and the second control module 151 respectively when it is detected that the upper bridge arm of the power module PM fails; the lower bridge fault detection module is connected with the lower bridge arm of the power module PM, the first control module 142 and the second control module 151 respectively, and is used for outputting a lower bridge error signal to the first control module 142 and the second control module 151 respectively when it is detected that the lower bridge arm of the power module PM fails; wherein the first control module 142 and the second control module 151 are used for determining that the power module has a bridge arm fault when the upper bridge error signal or the lower bridge error signal is received.

[0085] As an implementation, the speed sampling module can include a motor rotor position sampling module 135 and a decoding module, the motor rotor position sampling module 135 is connected with the decoding module, and is used for sampling a rotor position of the motor M and sending the rotor position to the decoding module. The decoding module is connected with the first control module 142 and the second control module 151 respectively, and is used for decoding the rotor position of the motor M to obtain a speed of the motor M, and the speed is provided to the first control module 142 and the second control module 151. This implementation can obtain the speed of the motor M when the communication between the first control module 142 and the second control module 151 is abnormal.

[0086] As another implementation, referring to FIG. 8 and FIG. 9, the speed sampling module can include a motor rotor position sampling module 135, and the decoding module can be integrated in the second control module 151. The motor rotor position sampling module 135 is connected with the second control module 151, and is used for sampling a rotor position of the motor M and sending the rotor position to the second control module 151, so that the second control module 151 obtains a speed of the motor M according to the rotor position, and sends the speed to the first control module 142.

[0087] In some embodiments, referring to FIG. 8 and FIG. 9, the detection device 120 can further include: an end voltage sampling module 131, a temperature sampling module 132, a bus voltage sampling module 133, and a collision detection module (not shown in FIG. 8).

[0088] The end voltage sampling module 131 is connected to the first control module 142 and the second control module 151 respectively, for sampling the end voltage of the power module PM and sending the end 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, for sampling the temperature of the power module PM and sending the temperature to the second control module 151; the bus voltage sampling module 133 is connected to the first control module 142 and the second control module 151 respectively, for sampling the bus voltage of the power module PM and sending the bus voltage to the first control module 142 and the second control module 151 respectively; the collision detection module is connected to the first control module 142 and the second control module 151 respectively, for outputting a collision signal to the first control module 142 and the second control module 151 respectively when a collision of the new energy vehicle where the motor control system 100 is located is detected.

[0089] In this example, the first control module 142 is further configured to determine that at least one of the end 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 the collision signal is received, before controlling the phase line cutting device to cut off at least two of the three phase lines; and the second control module 151 is further configured to control the driving module 153 to drive the power module PM to shut down when any one of the end 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 the collision signal is received, wherein 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.

[0090] Specifically, the second control module 151 can determine the fault level of the motor control system 100 as low level when any of the following conditions occurs: receiving a collision signal (general collision, collision with a severity level less than or equal to a preset level), receiving an upper bridge error signal or a lower bridge error signal, receiving an overvoltage of line voltage or terminal voltage, receiving an overcurrent of three-phase current, receiving an overtemperature, or receiving an abnormal speed, and the conversion module 152 can control the drive module 153 to drive the power module PM to be turned off. The first control module 142 can receive an upper bridge error signal or a lower bridge error signal, and determine that the speed of the motor M is greater than a first preset speed, the phase current is greater than a first preset current and lasts for a preset time, and further judge the bus voltage, the terminal voltage, the collision signal (serious collision, collision with a severity level greater than a preset level), etc. If the conditions for turning on the ultimate protection are met, the first control device 140 can determine that the fault level of the motor control system 100 is high level, and the phase line cutting device 110 can be controlled to cut off at least two of the three phase lines to completely cut off the energy feedback path, thereby preventing the occurrence of arc or open fire phenomenon.

[0091] In some examples, as shown in FIGS. 8 and 9, the detection device 120 can further include a fault detection unit, which includes a terminal overvoltage detection module 121, a bus overvoltage detection module 122, an overcurrent detection module 123, or an OR module 124.

[0092] The terminal overvoltage detection module 121 is connected with the terminal voltage sampling module 131, and is configured to output a terminal overvoltage signal when detecting that the terminal voltage is overvoltage. The bus overvoltage detection module 122 is connected with the bus voltage sampling module 133, and is configured to output a bus overvoltage signal when detecting that the bus voltage is overvoltage. The overcurrent detection module 123 is connected with the current sampling module 134, and is configured to output an overcurrent error signal when detecting that at least one of the three-phase currents is overcurrent. The OR module 124 is connected with 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, respectively, and is configured to output an interrupt signal to the second control module 151 when receiving any 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 drive module 153 to drive the power module PM to be turned off.

[0093] In this example, the bus overvoltage signal, the terminal overvoltage signal and the overcurrent error signal are input into the OR gate module 124 together with the upper bridge error signal and the lower bridge error signal to form a total error signal, which is input into the interrupt pin of the second control module 151. When the total error signal is 0, it indicates that no overvoltage, overcurrent, upper bridge fault or lower bridge fault occurs in the motor control system 100, and the interrupt is not enabled at this time. When the total error signal is 1, it indicates that at least one of the overvoltage, overcurrent, upper bridge fault or lower bridge fault occurs in the motor control system 100, and the interrupt is enabled at this time, so that the second control module 151 can respond faster and thus quickly execute the protection action.

[0094] As an implementation form, the fault detection unit can further include an insurance detection module configured to detect whether a voltage difference between the two ends of 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 send the detection result to the first control module 142 and the second control module 151.

[0095] In some embodiments of the present application, as shown in FIGS. 8-10, the second control device 150 further includes a conversion module 152 and a dead machine monitoring module 154. The conversion module 152 is connected to the control end of the power module PM through the driving module 153, and the dead machine monitoring module 154 is connected to the second control module 151, the conversion module 152 and the driving module 153 respectively, for controlling the driving module 153 to drive the power module PM to shut down through the conversion module 152 when it is monitored that the second control module 151 is dead, or directly controlling the driving module 153 to drive the power module PM to shut down.

[0096] Specifically, the dead machine monitoring module 154 always monitors whether the second control module 151 is dead. When the second control module 151 is dead, the dead machine monitoring module 154 outputs a dead machine lock wave signal to the conversion module 152 to make it perform related actions such as wave locking. The conversion module 152 can be a chip, a level conversion module, a NOT gate, etc., and can play the role of wave locking. The dead machine lock wave signal can also be directly given to the driving module 153 to perform related wave locking operations, but it is required that the driving module 153 has an active short circuit (ASC) function.

[0097] As an implementation form, as shown in FIGS. 8-10, the second control module 151 can also be connected to the conversion module 152, which can convert the PWM wave output by the second control module 151 to control the driving module 153 to drive the power module PM to shut down.

[0098] In some embodiments of the present application, as shown in FIG. 10, FIG. 12-FIG. 14, the motor control system 100 further comprises a third control device 160 and a power supply device 170, wherein the power supply device 170 comprises a first power supply module 171, an input end of the first power supply module 171 is connected with a battery, an output end of the first power supply module 171 is connected with the drive module 153, and the first power supply module 171 is used to convert a 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 with the first power supply module 171, and is used to monitor the first power supply module 171 and control the drive module 153 to drive the power module PM to be turned off when an abnormality of the first power supply module 171 is monitored.

[0099] Specifically, the monitoring of the primary side power supply of the drive module 153 (i.e. the first power supply module 171) can be increased, and the third control device 160 used to realize the monitoring can be realized by a logic circuit or a chip. When the third control device 160 monitors that the output voltage of the first power supply module 171 is abnormal, the third control device 160 controls the drive module 153 to drive the power module PM to be turned off, which can comprise that the third control device 160 outputs an ASC signal to a high-voltage side ASC pin of the drive module 153 to realize the operation of directly turning off the high-voltage side in an emergency without relying on the control of the PWM by the low-voltage end signal of the drive module 153, thereby realizing the second path of the emergency shutdown. The first power supply module 171 can adopt a DC-DC structure or an integrated circuit (chip), and the main function is direct current voltage conversion; the first voltage 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.

[0100] In some examples, as shown in FIG. 11, the third control device 160 comprises a power supply monitoring module 161 and an isolation module 162.

[0101] The power supply monitoring module 161 is connected with the first power supply module 171, is used to monitor the first power supply module 171, and outputs a power supply abnormal protection signal to the isolation module 162 when an abnormality of the first power supply module 171 is monitored; and the isolation module 162 is used to output an active short-circuit signal (i.e. an ASC signal) to the drive module 153 to control the drive module 153 to drive the power module PM to be turned off when the power supply abnormal protection signal is received.

[0102] 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 setting of the power supply monitoring module 161 and the isolation module 162, the reliability of the protection by the low-voltage power supply monitoring can be improved.

[0103] In some embodiments, referring to FIG. 11, the first control module 142 is also connected with the second control module 151, the power supply monitoring module 161 and the isolation module 162, respectively, and is further configured to determine the fault level of the motor control system according to the communication condition with the second control module 151, whether the power abnormality protection signal or the active short circuit signal is received.

[0104] Specifically, referring to FIG. 11, the motor control system 100 is provided with three levels of protection, specifically as follows:

[0105] The first level of protection is that the second control module 151 collects information such as three-phase current, bus voltage, terminal voltage and rotating speed, reads error information such as upper bridge error, lower bridge error, overvoltage error and overcurrent error, and controls the drive module 153 to realize the shutdown of the normal power module PM through three-phase short circuit and six-phase open circuit; and when the second control module 151 is dead, a dead lock wave signal is formed, which is given to the primary ASC pin of the conversion module 152 or the drive module 153 to control the drive module 153 to shut down the power module PM.

[0106] The second level of protection is that when the first level of 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 identifies the abnormality, forms a high-voltage side ASC signal through the isolation module 162, and inputs the signal to the high-voltage end of the drive module 153 to control the reliable shutdown of the power module PM.

[0107] The third level of protection is the ultimate protection started in the case that the first level of protection and the second level of protection cannot cut off the motor control circuit, form an uncontrollable circuit loop, and have a long duration and large phase current, 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 cuts off the physical connection of at least two phases in the three-phase line through the phase line cutting device 110, such as cutting off at least two of the three-phase copper bars connected to the motor control, so that the motor control cannot form a loop, thereby realizing the cutting off of the energy loop.

[0108] In some embodiments of the application, the electric control ultimate protection is achieved by the way that the three-phase line cutting device 110 cuts off the connection of the motor M with the three-phase line, and the control of the three-phase line cutting device 110 is performed by the independent first control device 140 for special safety control, so the power supply design of the safety module (including the three-phase line cutting device 110 and the first control device 140) is double power supply, which respectively provides low-voltage electricity (the first voltage) provided by the vehicle storage battery 10 and high-voltage electricity (the third voltage) provided by the vehicle power battery, the third voltage is converted into the first voltage by the voltage conversion module, and the two power supplies supply power to the safety module at the same time. Moreover, the low-voltage electricity provided by the vehicle storage battery 10 is separated from the power supply of the normal control and driving module 153 and the power supply of the safety module by a diode, so as to avoid the mutual influence between the two loads.

[0109] Specifically, in some examples, as shown in FIG. 12, the input end of the first power supply module 171 is connected with the storage battery 10 through the first anti-reverse diode D1, and 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.

[0110] The input end of the voltage conversion module 172 is connected with the power battery Bat, which is used to reduce the third voltage (such as 600V) output by the power battery Bat to the first voltage (such as 12V); the input end of the second power supply module 173 is connected with the storage battery 10, which is used to convert the first voltage output by the storage 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 with the storage battery 10 through the second anti-reverse diode D2 and is connected with the output end of the voltage conversion module 172 through the third anti-reverse diode D3, which is used to convert the first voltage output by the storage 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 three-phase line cutting device 110 are connected with the storage battery 10 through the second anti-reverse diode D2 and are connected with the output end of the voltage conversion module 172 through the third anti-reverse diode D3.

[0111] In this example, referring to FIG. 12, the safety module adopts independent double power supply, the normal driving control module (including the driving module 153 and the second control module 151) is powered by the storage battery 10, and the power supply of the safety module is powered by the low-voltage electricity converted by the voltage conversion module 172 (which can adopt a transformer) from the power battery Bat and the storage battery 10. The double power supply function of the safety module can keep the safety module in a normal power supply state to a certain extent, the power supply of the safety module is independent of the power supply of the normal driving control module, which prevents the power supply of the safety module from being affected when the normal driving control module is abnormal, and the anti-reverse diode is respectively connected in series in the power supply lines of the normal driving control module and the safety module, which prevents the current between the two from flowing reversely to the other.

[0112] In some examples, as shown in FIG. 13, on the basis of the example shown in FIG. 12, the input end of the first power supply module 171 is further connected with the output end of the voltage conversion module 172 through the fourth anti-reverse diode D4. In addition, the ignition module 141 and the phase line cutting device 110 are connected with the storage battery through the second anti-reverse diode D2 and connected with the output end of the voltage conversion module 172 through the third anti-reverse diode D3.

[0113] In this example, both the safety module and the drive module 153 are powered by dual power supply, but are separated by anti-reverse diodes. When the first power supply module 171 is abnormal, the ASC signal can be output by the third control device 160 to realize the protection measures of short-circuiting the lower bridge three-phase or opening the six-phase of the drive power module PM, that is, the above-mentioned secondary protection.

[0114] In some examples, as shown in FIG. 14, the input end of the first power supply module 171 is connected with the storage battery 10 through the fifth anti-reverse diode D5 and the second anti-reverse diode D2 in sequence, and the power supply device 170 further comprises: a voltage conversion module 172, a second power supply module 173 and a third power supply module 174.

[0115] The input end of the voltage conversion module 172 is connected with the power battery Bat, and is used to reduce the third voltage output by the power battery Bat to a first voltage. The input end of the first power supply module 171 is further connected with the output end of the voltage conversion module 172 through the fifth anti-reverse diode D5 and the third anti-reverse diode D3 in sequence. The input end of the second power supply module 173 is connected with the storage battery 10 through the sixth anti-reverse diode D6 and the second anti-reverse diode D2 in sequence, and is connected with the output end of the voltage conversion module 172 through the sixth anti-reverse diode D6 and the third anti-reverse diode D3 in sequence. The second power supply module 173 is used to convert the 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. The input end of the third power supply module 174 is connected with the storage battery 10 through the second anti-reverse diode D2 and connected with the output end of the voltage conversion module 172 through the third anti-reverse diode D3, and is used 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. In addition, the ignition module 141 and the phase line cutting device 110 are connected with the storage battery through the second anti-reverse diode D2 and connected with the output end of the voltage conversion module 172 through the third anti-reverse diode D3.

[0116] In this example, 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 supply. When the power supply of the battery 10 is abnormal, the safety module and the normal drive control module can continue to be powered by the high-voltage-to-low-voltage conversion of the power battery Bat, and the safety module and the normal drive control module are separated by the anti-reverse diode to reduce the mutual influence between the modules.

[0117] 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, and the corresponding first power supply module 171 can also be divided into a first power supply sub-module and a second power supply sub-module. Whether to be divided or not can be set as needed, as shown in FIG. 14.

[0118] The motor control system of the embodiment of the application can realize three-level protection, and when the ultimate protection is triggered, at least two phases of the three-phase line can be cut off by the phase line cutting device, so as to reduce or avoid the risk of arc or even open fire caused by serious motor control system failure. Moreover, by powering the safety module by dual power supply, the reliability of the ultimate protection can be improved.

[0119] FIG. 15 is a flowchart of a motor control method according to an embodiment of the application.

[0120] In this embodiment, the motor control method is used in a motor control system, which includes a motor, a power module and a phase line cutting device. The DC end of the power module is provided with a DC bus for connecting a power battery, and a DC side fuse is arranged on the DC bus. The AC end of the power module is connected to the motor through a three-phase line, and the phase line cutting device is arranged corresponding to at least two phases of the three-phase line.

[0121] As shown in FIG. 15, the motor control method includes:

[0122] S151, when at least one of the DC side fuse is disconnected and the power module has a bridge arm short circuit fault occurs, and the rotational speed of the motor is greater than a first preset rotational speed, cutting off at least two phases of the three-phase line.

[0123] The DC end of the power module is provided with a DC bus for connecting a power battery, and a DC side fuse is arranged on the DC bus. The AC end of the power module is connected to the motor through a three-phase line.

[0124] In some embodiments of the application, before cutting off at least two phases of the three-phase line, 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.

[0125] In some embodiments of the application, before cutting off at least two phases of the three-phase line, the method further includes: determining that the duration of the bridge arm short circuit of the power module is greater than a second preset time.

[0126] In some embodiments of the present application, before cutting off at least two of the three-phase lines, the method further comprises: determining that the temperature of the power module is greater than a first preset temperature.

[0127] In some embodiments of the present application, before cutting off at least two of the three-phase lines, the method further comprises: determining that the new energy vehicle where the motor is located has a collision with a severity greater than a preset severity.

[0128] It should be noted that other specific embodiments of the motor control method of the present application can refer to the specific embodiments of the motor control system of the above-mentioned embodiments.

[0129] Based on the motor control method of the above-mentioned embodiments, the present application proposes a computer readable storage medium.

[0130] In this embodiment, the computer readable storage medium stores a computer program, and the computer program is executed by the processor to realize the motor control method of the above-mentioned embodiments.

[0131] FIG. 16 is a structural block diagram of a new energy vehicle according to an embodiment of the present application.

[0132] As shown in FIG. 16, the new energy vehicle 200 comprises a power battery Bat and the motor control system 100 of the above-mentioned embodiments.

[0133] The motor control system, method, storage medium and new energy vehicle according to the embodiments of the present application can realize three-level protection, and when the ultimate protection is triggered, 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 arc or even open fire caused by the motor control system failure. In addition, by double power supply to the safety module, the reliability of the ultimate protection can be improved.

[0134] It is to be appreciated that the above description and the examples that follow are intended to be illustrative only and that changes can be made to the description, as represented by the above listed elements, by the steps recited in the flow charts, and by the examples that follow, without departing from the spirit of the application. Accordingly, the scope of the present application is intended to be defined only by the appended claims.

[0135] It should be understood that aspects of the application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following techniques, which are well known in the art of hardware implementation, can be used: a hybrid of the above techniques, a mixture of two or more of the above techniques, or a combination of the above techniques with other techniques not listed above.

[0136] In the description of the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not intended to exclude that the terms in the specification can refer to the same or similar features, structures, materials, or characteristics. Furthermore, it is to be understood that the particular feature, structure, material, or characteristic can be combined in any one or more embodiments or examples.

[0137] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0138] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0139] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0140] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0141] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as a limitation on the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An electric machine control system (100), characterized by, The motor (M) and the power module (PM) are provided with a DC bus for connecting a power battery (Bat), and a DC side fuse (FU) is arranged on the DC bus, and the AC end of the power module (PM) is connected with the motor (M) through three-phase lines, and the motor control system (100) further comprises: a phase line cutting device (110) corresponding to at least two of the three-phase lines; a detection device (120) for detecting at least one of first operating information and second operating information, and for detecting third operating information, wherein the first operating information includes a bridge arm fault condition of the power module, the second operating information includes a connection condition of the DC side fuse (FU), and the third operating information includes a rotating speed of the motor (M); a first control device (140) connected with the phase line cutting device (110) and the detection device (120), respectively, for controlling the phase line cutting device (110) to cut at least two of the three-phase lines 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 rotating speed of the motor (M) is greater than a first preset rotating speed.

2. The motor control system (100) according to claim 1, characterized in that The third operating information further includes a phase current of the motor (M), and 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 rotating speed of the motor (M) is greater than the first preset rotating 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 or 2, characterized in that The detection device (120) is configured to detect at least a bus voltage difference between two ends of the DC side fuse (FU), and determine that the DC side fuse (FU) is disconnected when the bus voltage difference is greater than a first voltage threshold; and / or, The detection device (120) is configured to detect at least a bus current of a DC bus where the DC side fuse (FU) is arranged, 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 any one of claims 1-3, characterized in that, 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 power module (PM) has a bridge arm short-circuit fault and lasts for more than a second preset time, and the rotating speed of the motor (M) is greater than the first preset rotating speed.

5. The motor control system (100) according to any one of claims 1-4, characterized by, The second operating information further includes a temperature of the power module (PM), and 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 before controlling the phase line cutting device (110) to cut at least two of the three-phase lines.

6. The motor control system (100) according to any one of claims 1-5, characterized by, The first operating information further includes a collision condition of a new energy vehicle where the motor control system (100) is arranged, and the first control device (140) is further configured to determine that the new energy vehicle has a collision with a severity greater than a preset severity before controlling the phase line cutting device (110) to cut at least two of the three-phase lines.

7. The motor control system (100) according to any one of claims 1-6, characterized by, The first control device (140) comprises: an ignition module (141) connected with the phase line cutting device (110); a first control module (142) connected with the ignition module (141) and the detection device (120) respectively, configured to control the phase line cutting device (110) to cut at least two of the three phase lines through the ignition module (141) when at least one of the following conditions occurs: the DC side fuse (FU) is disconnected, the power module (PM) has a bridge arm short circuit fault, and the rotating speed of the motor (M) is greater than a first preset rotating speed.

8. The motor control system (100) of claim 7, characterized in that The motor control system (100) further comprises a second control device (150), and the second control device (150) comprises a second control module (151) and a driving module (153); wherein, the second control module (151) is connected with the detection device (120) and the driving module (153) respectively, configured to control the driving module (153) to drive the power module (PM) to be turned off when any one of the following conditions occurs: the DC side fuse (FU) is disconnected, the power module (PM) has a bridge arm fault, and the rotating speed of the motor (M) is greater than a second preset rotating speed, wherein the second preset rotating speed is less than or equal to the first preset rotating speed.

9. The motor control system (100) of claim 8, characterized in that, The second control device (150) further comprises: a conversion module (152) connected with a control end of the power module (PM) through the driving module (153); a dead machine monitoring module (154) connected with the second control module (151), the conversion module (152) and the driving module (153) respectively, configured to control the driving module (153) to drive the power module (PM) to be turned off through the conversion module (152) or directly control the driving module (153) to drive the power module (PM) to be turned off when it is monitored that the second control module (151) is dead.

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

11. The motor control system (100) of claim 10, characterized in that The third control device (160) comprises: a power supply monitoring module (161) connected with the first power supply module (171), configured to monitor the first power supply module (171) and output a power supply abnormality protection signal to an isolation module (162) when it is monitored that the first power supply module (171) is abnormal. The isolation module (162) is configured to output an active short-circuit signal to the driving module (153) when the power abnormality protection signal is received, so as to control the driving module (153) to drive the power module (PM) to be turned off.

12. The motor control system (100) of claim 11, characterized in that, The first control module (142) is further connected with the second control module (151), the power supply monitoring module (161) and the isolation module (162), and is configured to determine at least one of the following conditions before controlling the phase line cutting device to cut off at least two of the three phase lines: communication abnormality with the second control module (151), receiving the power abnormality protection signal, and receiving the active short-circuit signal.

13. The motor control system (100) according to any one of claims 10-12, characterized by, The input end of the first power supply module (171) is connected with the battery (10) through a first anti-reverse diode (D1), and the power supply device (170) further comprises: a voltage conversion module (172), an input end of the voltage conversion module (172) being connected with the power battery (Bat), and the voltage conversion module (172) being configured to reduce a third voltage output by the power battery (Bat) to the first voltage; a second power supply module (173), an input end of the second power supply module (173) being connected with the battery (10), and the second power supply module (173) being configured to convert the first voltage output by the battery (10) into a fourth voltage to supply power to the second control module (151); a third power supply module (174), an input end of the third power supply module (174) being connected with the battery (10) through a second anti-reverse diode (D2) and connected with an output end of the voltage conversion module (172) through a third anti-reverse diode (D3), and the third power supply module (174) being configured 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).

14. The motor control system (100) of claim 13, characterized in that, The input end of the first power supply module (171) is further connected with the output end of the voltage conversion module (172) through a fourth anti-reverse diode (D4).

15. The motor control system (100) according to any one of claims 10-12, characterized by, The input end of the first power supply module (171) is connected with the battery (10) through a fifth anti-reverse diode (D5) and a second anti-reverse diode (D2) in sequence, and the power supply device (170) further comprises: a voltage conversion module (172), an input end of the voltage conversion module (172) being connected with the power battery (Bat), and the voltage conversion module (172) being configured to reduce a 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 connected with the output end of the voltage conversion module (172) through the fifth anti-reverse diode (D5) and a third anti-reverse diode (D3) in sequence; A second power supply module (173) has an input end connected to the battery (10) through the sixth anti-reverse diode (D6) and the second anti-reverse diode (D2) and connected to the output end of the voltage conversion module (172) through the sixth anti-reverse diode (D6) and the third anti-reverse diode (D3), and is configured 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). A third power supply module (174) has an input end connected to the battery (10) through the second anti-reverse diode (D2) and connected to the output end of the voltage conversion module (172) through the third anti-reverse diode (D3), and is configured 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).

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

17. A method of controlling an electric machine, characterized by The method comprises the following steps: When at least one of the DC side fuse is disconnected and the power module has a bridge arm short circuit fault, and the rotating speed of the motor is greater than a first preset rotating speed, cutting off at least two phase lines in the three phase lines, wherein the DC end of the power module is provided with a DC bus for connecting a power battery, and the DC bus is provided with the DC side fuse, and the AC end of the power module is connected to the motor through the three phase lines.

18. The electric machine control method of claim 17, wherein, Before cutting off at least two phase lines in the three phase lines, the method further comprises: 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 electric machine control method of claim 17 or 18, wherein, Before cutting off at least two phase lines in the three phase lines, the method further comprises: Determining that the power module has a bridge arm short circuit lasting for more than a second preset time.

20. The electric machine control method of any of claims 17-19, wherein, Before cutting off at least two phase lines in the three phase lines, the method further comprises: Determining that the temperature of the power module is greater than a first preset temperature.

21. The motor control method of any of claims 17-20, wherein, Before cutting off at least two phase lines in the three phase lines, the method further comprises: Determining that the new energy vehicle in which the motor is located has a collision with a severity greater than a preset severity.

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

23. A new energy vehicle (200), characterized in that, The method comprises the following steps: A power battery (Bat) and a motor control system (100) according to any one of claims 1-16. The computer program is executed by a processor to implement the motor control method according to any one of claims 17-21.

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