CN110011278B - Motor short-circuit protection method and device - Google Patents
Motor short-circuit protection method and device Download PDFInfo
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- CN110011278B CN110011278B CN201910283675.4A CN201910283675A CN110011278B CN 110011278 B CN110011278 B CN 110011278B CN 201910283675 A CN201910283675 A CN 201910283675A CN 110011278 B CN110011278 B CN 110011278B
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- rotating speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
Abstract
The embodiment of the invention relates to the technical field of overvoltage protection, and discloses a motor short-circuit protection method and device, which comprise the following steps: detecting whether a capacitor voltage in a motor controller of a vehicle exceeds a preset voltage threshold; if the rotation speed exceeds the preset rotation speed threshold, judging whether the rotation speed of the motor of the vehicle is less than or equal to the preset rotation speed threshold; and if the rotating speed of the motor of the vehicle is less than or equal to a preset rotating speed threshold value, controlling a power device in the motor controller to forbid the switching on of the tube and forbid the starting of the active short-circuit protection scheme. By implementing the embodiment of the invention, the probability of failure or even damage of the power device or the motor controller can be reduced.
Description
Technical Field
The invention relates to the technical field of overvoltage protection, in particular to a short-circuit protection method and device for a motor.
Background
When a main relay of a vehicle motor is disconnected in a fault state of a vehicle, the voltage on a capacitor in a motor controller may rapidly rise due to back electromotive force of the vehicle motor flowing backward or short-term charging of a charger, and further, a power device (for example, an Insulated Gate Bipolar Transistor (IGBT)) in the motor controller may be damaged, and even the safety of the whole vehicle of the vehicle may be affected. At present, the above risks are generally avoided by the following active short-circuit protection schemes: when the voltage on the capacitor in the motor controller is detected to exceed a preset threshold value, three upper bridges or three lower bridges in an IGBT (insulated gate bipolar transistor) in the motor controller are controlled to be opened so as to enable the motor winding to be short-circuited, and further enable the motor back electromotive force of the vehicle to be consumed in a mode of heating the motor winding.
In practice, if the specific working conditions of the vehicle are not distinguished, the active short-circuit protection scheme is started blindly when a fault occurs, and the back electromotive force of the backward flow of the vehicle motor is completely acted on three upper bridges or three lower bridges in the IGBT, so that a power device in a motor controller can be failed or even damaged; in addition, a large transient current is generated at the moment of short circuit of a motor winding, and the transient current may cause magnetic steel of the motor to lose magnetism, so that the motor controller is disabled or even damaged.
It can be seen that blind activation of the active short-circuit protection scheme described above can cause the power device or the motor controller to malfunction or even fail.
Disclosure of Invention
The embodiment of the invention discloses a motor short-circuit protection method and device, which can reduce the probability of failure and even damage of a power device or a motor controller.
The embodiment of the invention discloses a motor short-circuit protection method in a first aspect, which comprises the following steps:
detecting whether a capacitor voltage in a motor controller of a vehicle exceeds a preset voltage threshold; if the rotation speed of the motor of the vehicle is greater than or equal to a preset rotation speed threshold value, judging whether the rotation speed of the motor of the vehicle is less than or equal to the preset rotation speed threshold value;
and if the rotating speed of the motor of the vehicle is less than or equal to the preset rotating speed threshold value, controlling a power device in the motor controller to prohibit the switching on of the tube and prohibit the active short-circuit protection scheme from being started.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, when the motor speed of the vehicle is less than or equal to the preset speed threshold, controlling a power device in the motor controller to prohibit opening a tube and prohibit enabling an active short-circuit protection scheme, includes:
when the motor rotating speed of the vehicle is zero and is smaller than the preset rotating speed threshold value, controlling a power device in the motor controller to prohibit the switching on of the tube and prohibiting the active short-circuit protection scheme from being started;
or when the rotating speed of the motor of the vehicle is greater than zero and less than or equal to a preset rotating speed threshold value, controlling the state of a power device in the motor controller to be switched from an open tube to a closed tube, and forbidding to start the active short-circuit protection scheme.
As an optional implementation manner, in the first aspect of this embodiment of the present invention, the method further includes:
and if the rotating speed of the motor of the vehicle is greater than the preset rotating speed threshold value, starting the active short-circuit protection scheme.
As an optional implementation manner, in the first aspect of this embodiment of the present invention, after the enabling of the active short-circuit protection scheme, the method further includes:
judging whether transient current is detected in the motor controller, wherein the transient current is a preset current value and current of preset generation times;
if the transient current is detected, outputting prompt information, wherein the prompt information is used for prompting a user to control the vehicle to decelerate so as to make the motor rotating speed of the vehicle to be reduced to be less than or equal to the preset rotating speed threshold value;
and when the rotating speed of the motor of the vehicle is detected to be less than or equal to the preset rotating speed threshold value, controlling the state of a power device in the motor controller to be switched off by switching on the power device, and deactivating the active short-circuit protection scheme.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, before the determining whether the rotation speed of the motor of the vehicle is less than or equal to a preset rotation speed threshold, the method further includes:
acquiring the maximum motor speed and the minimum motor speed of the vehicle in a target time period; the duration of the target time period is less than or equal to a preset duration threshold;
and calculating the average value of the maximum motor speed and the minimum motor speed in the target time period as the motor speed of the vehicle.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, after the obtaining of the maximum motor speed and the minimum motor speed of the vehicle in the target time period, the method further includes:
judging whether the difference value between the maximum motor rotating speed and the minimum motor rotating speed is smaller than or equal to a preset difference value threshold value or not;
and if the difference value between the maximum motor rotating speed and the minimum motor rotating speed is smaller than or equal to a preset difference value threshold value, executing the step of calculating the average value of the maximum motor rotating speed and the minimum motor rotating speed in the target time period as the motor rotating speed of the vehicle.
The second aspect of the embodiment of the invention discloses a motor short-circuit protection method, which comprises the following steps:
when the fact that a vehicle is charged is detected, whether a main relay in a battery pack of the vehicle is disconnected or not is judged;
if the main relay is disconnected, judging whether the voltage of a capacitor in a motor controller of the vehicle is increased to exceed a preset voltage threshold value by electric energy transmitted to the vehicle by a charger at the moment that the main relay is disconnected and the charger for charging the vehicle is not disconnected;
and if so, controlling a power device in the motor controller to prohibit the switching on of the tube and prohibit the active short-circuit protection scheme from being started.
The third aspect of the embodiments of the present invention discloses a short-circuit protection device for a motor, including:
a first detection unit for detecting whether a capacitor voltage in a motor controller of a vehicle exceeds a preset voltage threshold;
a first judging unit, configured to judge whether a motor rotation speed of a vehicle is less than or equal to a preset rotation speed threshold when the first detecting unit detects that a capacitor voltage in a motor controller of the vehicle exceeds the preset voltage threshold;
and the first control unit is used for controlling a power device in the motor controller to prohibit the switching on and prohibit the active short-circuit protection scheme from being started when the first judgment unit judges that the rotating speed of the motor of the vehicle is less than or equal to the preset rotating speed threshold value.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, when the first determining unit determines that the rotation speed of the motor of the vehicle is less than or equal to the preset rotation speed threshold, the first controlling unit is configured to control a power device in the motor controller to prohibit open the tube, and a manner of prohibiting the active short-circuit protection scheme from being enabled specifically is:
the first control unit is used for controlling a power device in the motor controller to prohibit the switching on and prohibit the active short-circuit protection scheme from being started when the first judging unit judges that the motor rotating speed of the vehicle is zero and is smaller than the preset rotating speed threshold value;
or, the controller is configured to control the state of a power device in the motor controller to be switched from an open tube to a closed tube and prohibit the active short-circuit protection scheme from being enabled when the first determination unit determines that the motor speed of the vehicle is greater than zero and less than or equal to a preset speed threshold.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the apparatus further includes:
and the starting unit is used for starting the active short-circuit protection scheme when the first judging unit judges that the rotating speed of the motor of the vehicle is greater than the preset rotating speed threshold value.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the apparatus further includes:
a second determining unit, configured to determine whether a transient current is detected in the motor controller after the active short-circuit protection scheme is started by the starting unit, where the transient current is a preset current value and a current generated for a preset number of times;
the output unit is used for outputting prompt information when the second judging unit detects the transient current, and the prompt information is used for prompting a user to control the vehicle to reduce the speed so as to reduce the motor speed of the vehicle to be less than or equal to the preset speed threshold;
and the second control unit is used for controlling the state of a power device in the motor controller to be switched off by switching on and switching off the tube when the motor rotating speed of the vehicle is detected to be less than or equal to the preset rotating speed threshold value, and the active short-circuit protection scheme is stopped.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the apparatus further includes:
the obtaining unit is used for obtaining the maximum motor rotating speed and the minimum motor rotating speed of the vehicle in a target time period before the first judging unit judges whether the motor rotating speed of the vehicle is smaller than or equal to a preset rotating speed threshold value; the duration of the target time period is less than or equal to a preset duration threshold;
and the calculating unit is used for calculating the average value of the maximum motor rotating speed and the minimum motor rotating speed in the target time period as the motor rotating speed of the vehicle.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the apparatus further includes:
the third judging unit is used for judging whether the difference value between the maximum motor rotating speed and the minimum motor rotating speed is smaller than or equal to a preset difference threshold value or not after the acquiring unit acquires the maximum motor rotating speed and the minimum motor rotating speed of the vehicle in a target time period;
and the calculating unit is specifically configured to calculate an average value of the maximum motor speed and the minimum motor speed in the target time period as the motor speed of the vehicle when the third determining unit determines that the difference between the maximum motor speed and the minimum motor speed is smaller than or equal to a preset difference threshold.
The fourth aspect of the embodiment of the present invention discloses a short-circuit protection device for a motor, comprising:
the first judgment unit is used for judging whether a main relay in a battery pack of a vehicle is disconnected or not when the vehicle is detected to be charged;
the second judgment unit is used for judging whether the voltage of a capacitor in a motor controller of the vehicle is increased to exceed a preset voltage threshold value by electric energy transmitted to the vehicle by a charger when the main relay is disconnected and the charger for charging the vehicle is not disconnected when the first judgment unit judges that the main relay in the battery pack of the vehicle is disconnected;
and the control unit is used for controlling a power device in the motor controller to prohibit the switching on of the tube and prohibit the active short-circuit protection scheme from being started when the second judgment unit judges that the electric energy transmitted to the vehicle by the charger leads the voltage on a capacitor in the motor controller of the vehicle to rise to exceed the preset voltage threshold.
The fifth aspect of the embodiment of the present invention discloses a short-circuit protection device for a motor, including:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program code stored in the memory to execute the motor short-circuit protection method disclosed in the first aspect of the embodiment of the invention and the motor short-circuit protection method disclosed in the second aspect of the embodiment of the invention.
A sixth aspect of the embodiments of the present invention discloses a computer-readable storage medium storing a computer program, where the computer program causes a computer to execute a motor short-circuit protection method disclosed in the first aspect of the embodiments of the present invention and a motor short-circuit protection method disclosed in the second aspect of the embodiments of the present invention.
A seventh aspect of the embodiments of the present invention discloses a computer program product, which, when running on a computer, causes the computer to perform part or all of the steps of any one of the methods of the first aspect of the embodiments of the present invention.
An eighth aspect of the present embodiment discloses an application publishing platform, where the application publishing platform is configured to publish a computer program product, where when the computer program product runs on a computer, the computer is enabled to execute part or all of the steps of any one of the methods in the first aspect of the present embodiment.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, when the rotating speed of the motor of the vehicle is zero, if the voltage on the capacitor in the motor controller of the vehicle is detected to exceed a preset voltage threshold, the power device in the motor controller is controlled to prohibit the switching-on and the active short-circuit protection scheme is prohibited to be started, because the power device in the motor controller is prohibited to be switched on, the voltage on the capacitor can be superposed on six bridge arms in the power device, compared with the case of starting the active short-circuit protection scheme, the voltage on the capacitor is superposed on the bridge arms of three upper bridges or three lower bridges in the power device, the voltage resistance is higher, and the probability of damage of the power device is further reduced;
when the motor rotating speed of the vehicle is greater than zero and less than or equal to a preset rotating speed threshold value, if the voltage on a capacitor in a motor controller of the vehicle is detected to exceed the preset voltage threshold value, controlling the state of a power device in the motor controller to be switched from an open tube to a closed tube, and forbidding to start an active short-circuit protection scheme; because the rotating speed of the motor of the vehicle is greater than zero, namely the vehicle is indicated to be started, and the power device is switched on or off according to the preset frequency, the active short-circuit protection scheme is forbidden to be started, the power device in the motor controller is directly controlled to be switched off, the voltage on the capacitor can be superposed on six bridge arms in the power device, the voltage resistance of the power device is improved, and when the rotating speed of the motor of the vehicle is less than or equal to a preset rotating speed threshold value, the counter electromotive force generated by the motor is superposed on the six bridge arms in the power device and cannot exceed the voltage resistance of the power device, wherein the preset rotating speed threshold value can be obtained by measurement of developers;
in order to avoid the loss of field of the motor magnetic steel caused by transient current generated by winding short circuit and further cause the failure and even damage of a motor controller, the active short-circuit protection scheme can be not started in the method, and the active short-circuit protection scheme is not started as much as possible; however, when the rotation speed of the motor of the vehicle is greater than the preset rotation speed threshold, if it is detected that the voltage of the capacitor in the motor controller of the vehicle exceeds the preset voltage threshold, the voltage of the back electromotive force generated by the motor is large, and if the voltage of the back electromotive force is superposed on six arms of the power device, the voltage resistance of the power device will be exceeded, so an active short-circuit protection scheme is to be started to reduce the probability of failure or even damage of the power device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a motor short-circuit protection method disclosed in an embodiment of the invention;
FIG. 2 is a schematic flow chart illustrating another method for short-circuit protection of a motor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a short-circuit protection device for a motor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another short-circuit protection device for a motor according to an embodiment of the disclosure;
fig. 5 is a schematic structural diagram of another short-circuit protection device for a motor according to an embodiment of the disclosure;
FIG. 6 is a schematic diagram of a power device in a motor controller according to an embodiment of the disclosure;
fig. 7 is a schematic diagram for assisting in explaining how to measure the preset rotational speed threshold according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that the terms "first", "second" and "third" etc. in the description and claims of the present invention are used for distinguishing different objects, and are not used for describing a specific order. The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a motor short-circuit protection method and device, which can reduce the probability of failure and even damage of a power device or a motor controller.
The technical solution of the present invention will be described in detail with reference to specific examples.
Example one
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a motor short-circuit protection method according to an embodiment of the present invention. As shown in fig. 1, the short-circuit protection method for a motor may include the steps of:
101. the motor short-circuit protection device detects whether the voltage of a capacitor in a motor controller of a vehicle exceeds a preset voltage threshold value; if yes, go to step 102; if not, the process is ended.
In the embodiment of the present invention, the capacitor may include, but is not limited to: the DC _ LINK capacitor, namely a direct current support capacitor, belongs to one of passive devices, and has the advantages of high voltage resistance, large current resistance, low impedance, low inductance, small capacity loss, small leakage current, good temperature performance, high charging and discharging speed, long service life (about 10 ten thousand hours), safety, explosion prevention, convenient non-polar installation and the like. The method is widely applied to the power electronic industry;
the preset voltage threshold may be a voltage value on a capacitor that ensures that the motor controller is not damaged, and the specific value may be set by a developer according to a large number of experimental results.
102. The motor short-circuit protection device judges whether the motor rotating speed of the vehicle is less than or equal to a preset rotating speed threshold value or not; if so; step 103 is executed; if not, the flow is ended.
In the embodiment of the present invention, the method for measuring the motor speed of the vehicle may include, but is not limited to: a light reflection method, a magnetoelectric method, a grating method or a Hall switch detection method; the embodiment of the present invention is described by taking a hall switching detection method as an example, and the present invention should not be limited thereto. Hall switch detection method: the rotating part of the motor is fixed with a magnet, the periphery of the moving track of the magnet is provided with a Hall switch, when the motor rotates, the Hall switch periodically induces magnetic lines of force to generate pulse voltage, and the number of the pulse voltage in a certain time is counted to convert the rotating speed of the motor.
As an optional implementation manner, before determining whether the motor speed of the vehicle is less than or equal to a preset speed threshold, the motor short-circuit protection device may obtain a maximum motor speed and a minimum motor speed of the vehicle within a target time period; calculating the average value of the maximum motor speed and the minimum motor speed in the target time period as the motor speed of the vehicle; the duration of the target time period is less than or equal to a preset duration threshold;
it should be noted that the duration of the target time period may be set by a developer according to a large number of experimental results, and the preset duration threshold may be as small as possible (for example, one second), so that the motor speed is closer to a constant speed in the selected target time period, and further, a more accurate motor speed may be determined.
In practice, it is found that there is an accident if only the motor speed at a certain time point is taken as a subsequent motor speed judgment standard; by implementing the above method, a more representative motor speed can be obtained by preferably calculating the maximum motor speed and the minimum motor speed of the vehicle in a short period of time and calculating the average value thereof as the motor speed.
As another optional implementation manner, after the motor short-circuit protection device obtains the maximum motor speed and the minimum motor speed of the vehicle in the target time period, the motor short-circuit protection device may further determine whether a difference between the maximum motor speed and the minimum motor speed in the target time period is less than or equal to a preset difference threshold, and if the difference between the maximum motor speed and the minimum motor speed is less than or equal to the preset difference threshold, calculate an average value of the maximum motor speed and the minimum motor speed in the target time period as the motor speed of the vehicle.
It should be noted that the preset difference threshold may be set by a developer according to a great number of experimental results.
In practice, it is found that if the difference between the maximum rotation speed and the minimum rotation speed of the motor in the target time period is too large (i.e. if the difference is greater than a preset difference threshold), it indicates that the rotation speed of the motor at the time may suddenly change, and in this case, the average value of the maximum rotation speed and the minimum rotation speed of the motor in the target time period is calculated as the rotation speed of the motor, and the determined rotation speed of the motor is not representative. By implementing the method, the target time period in which the difference value between the maximum motor rotating speed and the minimum motor rotating speed is greater than the preset difference value threshold can be screened out, and further more representative motor rotating speeds can be determined.
In the embodiment of the present invention, the preset rotation speed threshold may be obtained by measuring according to the following method: the motor controller and the vehicle motor are operated in a power generation state on a test bench (wherein, the bus voltage is set as the highest voltage), the initial rotating speed of the vehicle motor is controlled to be 100rpm, the torque is set to be the maximum, a main relay (HV + in figure 7 represents the positive pole of a power supply; HV-represents the negative pole of the power supply; IGBT U, IGBT V and IGBT W respectively represent three insulated gate bipolar transistors; G1, G2, G3, G4, G5 and G6 respectively represent six bridges in three IGBTs) is switched off, so that the motor generates counter electromotive force to act on a power device in the motor controller, and the voltage between two points 1 and 2 in figure 7 can be measured through an oscilloscope; and then controlling the rotating speed of the vehicle motor to gradually increase from low to high by 100rpm increment each time, observing the voltage between the two points 1 and 2 by using an oscilloscope in the process, and if the voltage between the two points 1 and 2 is close to the withstand voltage limit of the power device (a margin of more than 50V is generally reserved, and the specific value of the withstand voltage of the power device can be inquired through the internet according to the type of the power device), suspending increasing the rotating speed of the motor, and recording the rotating speed of the motor at the moment as a preset rotating speed threshold.
It should be noted that: since the voltages of the counter electromotive forces generated by the motor at different rotation speeds are different, the rotation speed of the motor when the voltage of the counter electromotive force generated by the motor reaches the voltage-withstanding limit of the power device can be measured as a preset rotation speed threshold; further, when the rotating speed of the motor is less than or equal to a preset rotating speed threshold value, the counter electromotive force generated by the motor acts on the power device, so that the power device cannot be invalid or even damaged; in addition, the measured rotational speed thresholds for different vehicle motors may be different, for example: when an abnormality occurs, the higher the back electromotive force of the vehicle motor is used, the faster the voltage on the capacitor rises, and the higher the amplitude, the smaller the rotation speed threshold obtained by the above measurement method, so that the preset rotation speed threshold cannot be quantified, and the specific value can be obtained by a developer through the above measurement method according to the type of the motor used.
103. The motor short-circuit protection device controls a power device in a motor controller of the vehicle to prohibit the switching on and prohibit the active short-circuit protection scheme from being started.
In the embodiment of the present invention, the active short-circuit protection scheme may include: when the voltage on a capacitor in a motor controller of the vehicle is detected to exceed a preset voltage threshold, three upper bridges or three lower bridges in a power device in the motor controller are controlled to be opened so as to enable a motor winding to be short-circuited, and further enable the counter electromotive force of the motor of the vehicle to be consumed in a mode of heating the motor winding.
The power device may include: an Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power Semiconductor device composed of BJT (Bipolar Transistor) and MOS (Insulated Gate Field Effect Transistor), and has the advantages of both high input impedance of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and low on-state voltage drop of a power Transistor (Giant Transistor, GTR). The embodiment of the invention takes an Insulated Gate Bipolar Transistor (IGBT) as an example for explanation, and the method should not be limited;
in practice, it has been found that conventional vehicles automatically initiate the active short-circuit protection scheme described above upon detecting that the voltage across the capacitor in the motor controller exceeds a preset voltage threshold. As shown in fig. 6 (it should be noted that HV + in fig. 6 represents a positive pole of a power supply, HV-represents a negative pole of the power supply, IGBT U, IGBT V, and IGBT W represent three IGBT bipolar transistors, respectively, and G1, G2, G3, G4, G5, and G6 represent six bridges of the three IGBTs, respectively), when the active short-circuit protection scheme is started, the motor controller may control three upper bridges or three lower bridges of the IGBTs to open (i.e., G1, G3, and G5 to open, or G2, G4, and G6 to short-circuit the motor windings, so that the motor back electromotive force of the vehicle is consumed by the heating of the motor windings; however, the active short-circuit protection scheme may cause a large-value transient current (i.e., a current with a certain value and generation times) to be generated at the short-circuit moment of the motor winding, and the transient current may cause magnetic steel of the motor to lose magnetism, thereby causing the motor to fail or even be damaged. However, when the embodiment of the present invention is implemented, the motor short-circuit protection device may monitor the voltage on the capacitor in the motor controller through a built-in voltage monitoring instrument, and when the voltage exceeds a preset voltage threshold and the motor speed is less than a preset speed threshold, the active short-circuit protection scheme is prohibited from being enabled, so as to avoid the magnetic steel of the motor from being demagnetized due to transient current, and reduce the probability of failure or even damage of the motor controller;
as shown in fig. 6, when the active short-circuit protection scheme is started, the voltage on the capacitor can only be superposed on three upper bridges or three lower bridges in the IGBT (wherein, when the three upper bridges are opened, the voltage on the capacitor is superposed on the bridge arms of the three lower bridges; when the three lower bridges are opened, the voltage on the capacitor is superposed on the bridge arms of the three upper bridges), and the voltage resistance is weak (the voltage resistance is only half); when the voltage of the capacitor of the motor short-circuit protection device exceeds the preset voltage threshold and the rotating speed of the motor is less than the preset rotating speed threshold, the IGBT in the motor controller can be controlled to prohibit the tube from being opened (namely, three upper bridges and three lower bridges are prohibited to be opened), so that the voltage of the capacitor is superposed on bridge arms of the three upper bridges and the three lower bridges in the IGBT, the voltage resistance is higher, and the probability of failure and even damage of the IGBT is further reduced.
As an optional implementation manner, when the motor rotation speed of the vehicle is less than or equal to a preset rotation speed threshold, the motor short-circuit protection device controls a power device in a motor controller of the vehicle to prohibit the switching on, and the manner of prohibiting the active short-circuit protection scheme from being enabled may be: when the motor rotating speed of the vehicle is zero and less than a preset rotating speed threshold value, the motor short-circuit protection device controls a power device in the motor controller to prohibit the switching on and prohibit the active short-circuit protection scheme from being started.
As another alternative embodiment, when the motor speed of the vehicle is less than or equal to the preset speed threshold, the motor short-circuit protection device controls a power device in a motor controller of the vehicle to prohibit the switching on, and the manner of prohibiting the active short-circuit protection scheme from being enabled may be: when the motor rotating speed of the vehicle is greater than zero and less than or equal to a preset rotating speed threshold value, the motor short-circuit protection device controls the state of a power device in the motor controller to be switched from an open tube to a closed tube, and an active short-circuit protection scheme is forbidden to be started.
In practice, it is found that when the motor speed of the vehicle is greater than zero and less than or equal to a preset speed threshold, it indicates that the vehicle is started, at this time, the IGBT is turned on or off according to a preset frequency, and if the motor short-circuit protection device monitors that the voltage on the capacitor in the motor controller exceeds the preset voltage threshold through a built-in voltage monitoring instrument, the state of the IGBT may be controlled to be switched from on to off, so as to make the IGBT non-conductive (i.e., to prohibit three upper bridges and three lower bridges in the IGBT from being turned on), thereby improving the voltage-withstanding capability of the power device; at the moment, the rotating speed of the motor is less than or equal to the preset rotating speed threshold, so that when the counter electromotive force generated by the motor acts on six bridge arms (three upper bridges and three lower bridges) in the power device, the counter electromotive force does not exceed the voltage resistance of the power device, and further the power device can be prevented from being invalid and even damaged; in addition, the scheme of forbidding to start the active short-circuit protection can avoid the magnetic steel of the motor from being demagnetized due to transient current, thereby reducing the probability of failure and even damage of the motor controller.
As an optional implementation manner, the motor short-circuit protection device may enable the active short-circuit protection scheme when determining that the rotation speed of the motor of the vehicle is greater than a preset rotation speed threshold.
In practice, it is found that when the rotating speed of the motor of the vehicle is greater than a preset speed threshold, the back electromotive force generated by the motor is large, and if the active short-circuit protection scheme is not started, the large back electromotive force voltage may exceed the maximum voltage resistance of the power device, and if the active short-circuit protection scheme is acted on the power device, the power device may fail or even be damaged; therefore, the motor short-circuit protection device can start an active short-circuit protection scheme so as to consume the back electromotive force of the motor in a mode of heating the motor winding and reduce the probability of failure and even damage of the power device.
As an optional implementation manner, after the active short-circuit protection scheme is enabled, the motor short-circuit protection device may further determine whether a transient current is detected in the motor controller; if the transient current is detected, outputting prompt information, wherein the prompt information is used for prompting a user to control the vehicle to decelerate so as to reduce the motor rotating speed of the vehicle to be less than or equal to a preset rotating speed threshold value; and when the rotating speed of the motor of the vehicle is detected to be less than or equal to a preset rotating speed threshold value, controlling the state of a power device in the motor controller to be switched off by switching on the power device, and stopping the active short-circuit protection scheme.
It should be noted that the transient current is a preset current value and a current of a preset generation number.
In practice, it is found that an active short-circuit protection scheme is started to short-circuit a motor winding, the winding may generate transient current with random times and random magnitude, and the transient current may cause magnetic steel of the motor to lose magnetism, and even cause the motor to fail or even be damaged. By implementing the method, the motor short-circuit protection device can output prompt information to remind a user to control the vehicle to decelerate so as to reduce the rotating speed of the motor to be below a preset rotating speed threshold value; because the rotating speed is reduced, the counter electromotive force generated by the motor is reduced, and then even if the active short-circuit protection scheme is stopped, the smaller counter electromotive force acts on the power device and cannot exceed the voltage resistance of the power device, and the active short-circuit protection scheme is stopped, so that the failure of the motor controller can be avoided, and the safety of the whole vehicle can be protected.
It can be seen that, when the method described in fig. 1 is implemented, the motor short-circuit protection device may distinguish different working conditions of the vehicle by analyzing the rotation speed signal of the motor when it is detected that the voltage across the capacitor in the motor controller of the vehicle exceeds the preset voltage threshold, and then may take corresponding protection measures according to different rotation speeds of the motor, so as to avoid blindly starting the active short-circuit protection scheme, which may cause the power device or the motor controller to malfunction or even be damaged.
Example two
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating another short-circuit protection method for a motor according to an embodiment of the present invention. As shown in fig. 2, the short-circuit protection method of the motor may include the steps of:
it should be noted that: in the embodiment of the invention, the following steps 201 to 203 can be independently implemented to form an independent motor short-circuit protection method, which is used for performing short-circuit protection on the motor of the vehicle under the working condition that the vehicle is charged; in addition, the following steps 201 to 203 can also be implemented in cooperation with a motor short-circuit protection method disclosed in the first embodiment to form a scheme for performing short-circuit protection on the vehicle motor under various working conditions; the embodiments of the present invention are not limited.
201. When the motor short-circuit protection device detects that the vehicle is charged, judging whether a main relay in a battery pack of the vehicle is disconnected or not; if so, go to step 202; if not, the process is ended.
202. The motor short-circuit protection device judges whether the electric energy transmitted to the vehicle by the charger raises the voltage on a capacitor in a motor controller of the vehicle to exceed a preset voltage threshold value at the moment that a main relay in the battery pack is disconnected and the charger for charging the vehicle is not disconnected; if yes, go to step 203; if not, the process is ended.
In the embodiment of the invention, at the moment that the main relay in the battery pack is disconnected but the charger for charging the vehicle is not disconnected, the electric energy transmitted to the vehicle by the charger at the moment is the main reason for the voltage rise on the capacitor, namely the electric energy is not caused by the counter electromotive force generated when the motor is started; therefore, whether the voltage of the capacitor in the motor controller of the vehicle is increased to exceed a preset voltage threshold value or not by the electric energy instantaneously transmitted by the charger can be judged so as to judge whether to execute subsequent protective measures or not.
It should be further noted that the abnormal charging (e.g. overcurrent) condition of the vehicle can be classified into the following two conditions: (1) due to abnormal control of a Battery Management System (BMS), a main relay of a vehicle is cut off first, and then a relay of a charger that charges the vehicle is cut off, which may cause a situation that a voltage on a capacitor in a motor controller of the vehicle rises to exceed a preset voltage threshold; (2) the Battery Management System (BMS) is normally controlled by first switching off the relay of the charger that charges the vehicle and then switching off the main relay of the entire vehicle. However, if the relay of the charger is not cut off due to adhesion, and the main relay of the subsequent vehicle is cut off again (i.e., the main relay of the vehicle is cut off under the condition that the relay of the charger is not cut off, i.e., the first condition is changed, the main relay of the vehicle is cut off first, and then the relay of the charger is cut off), the voltage on the capacitor in the motor controller of the vehicle may also rise to exceed the preset voltage threshold.
203. The motor short-circuit protection device controls a power device in the motor controller to forbid the switching on of the tube and forbids the starting of an active short-circuit protection scheme.
In the embodiment of the invention, the motor short-circuit protection device controls the power device in the motor controller to prohibit the switching on of the power device (namely, to prohibit the three upper bridges and the three lower bridges in the IGBT from being switched on), and the same as the step 103 in the first embodiment, the voltage resistance of the power device can be improved, and because the electric energy instantaneously transmitted by the charger is small, the generated voltage is also small, and the small voltage acts on the power device and cannot exceed the voltage resistance of the power device, thereby avoiding the failure and even damage of the power device; in addition, the active short-circuit protection scheme is forbidden to be started, so that the magnetic steel of the motor can be prevented from being demagnetized due to transient current, and the probability of failure and even damage of the motor controller is reduced.
It can be seen that, compared with the implementation of the method described in fig. 1, the implementation of the method described in fig. 2 can also control the power device in the motor controller to disable the open-circuit and disable the active short-circuit protection scheme when the main relay of the battery pack is opened due to the charging failure of the vehicle, so as to avoid the failure or even damage of the motor controller or the power device in the motor controller.
EXAMPLE III
Referring to fig. 3, fig. 3 is a schematic structural diagram of a short-circuit protection device for a motor according to an embodiment of the present invention. As shown in fig. 3, the short-circuit protection device for a motor may include:
a first detection unit 301 for detecting whether a capacitor voltage in a motor controller of a vehicle exceeds a preset voltage threshold;
a first determination unit 302, configured to determine whether a motor rotation speed of the vehicle is less than or equal to a preset rotation speed threshold when the first detection unit 301 detects that a capacitor voltage in a motor controller of the vehicle exceeds the preset voltage threshold;
the first control unit 303 is configured to control a power device in the motor controller to prohibit switching on and prohibit enabling the active short-circuit protection scheme when the first determination unit 302 determines that the rotational speed of the motor of the vehicle is less than or equal to the preset rotational speed threshold.
It can be seen that, with the motor short-circuit protection device described in fig. 3, when it is detected that the voltage across the capacitor in the motor controller of the vehicle exceeds the preset voltage threshold, the motor short-circuit protection device can distinguish different working conditions of the vehicle by analyzing the rotation speed signal of the motor, and then can take corresponding protection measures according to different rotation speeds of the motor, so as to avoid blindly starting the active short-circuit protection scheme, and further cause the power device or the motor controller to malfunction or even damage.
Example four
Referring to fig. 4, fig. 4 is a schematic structural diagram of another short-circuit protection device for a motor according to an embodiment of the present invention. The motor short-circuit protection device shown in fig. 4 is optimized from the motor short-circuit protection device shown in fig. 3. Compared with the motor short-circuit protection device shown in fig. 3, the motor short-circuit protection device shown in fig. 4 may further include:
and the enabling unit 304 is configured to enable the active short-circuit protection scheme when the first judging unit 302 judges that the rotation speed of the motor of the vehicle is greater than the preset rotation speed threshold.
By implementing the method, the counter electromotive force of the motor can be consumed in a mode of heating the motor winding by starting an active short-circuit protection scheme, and the probability of failure and even damage of a power device is reduced.
As an alternative embodiment, the short-circuit protection device for a motor shown in fig. 4 may further include:
a second determination unit 305 for determining whether or not a main relay in a battery pack of the vehicle is turned off when it is detected that the vehicle is being charged;
a third determining unit 306, configured to determine, when the second determining unit 305 determines that the main relay in the battery pack of the vehicle is turned off, whether the electric energy transmitted to the vehicle by the charger at the moment that the main relay is turned off and the charger charging the vehicle is not turned off, causes the voltage on the capacitor in the motor controller of the vehicle to rise to exceed a preset voltage threshold;
the second control unit 307 is configured to control a power device in the motor controller to prohibit the power device from being turned on and prohibit the active short-circuit protection scheme from being turned on when the third determination unit 306 determines that the electric energy transmitted to the vehicle by the charger increases the voltage across the capacitor in the motor controller of the vehicle to exceed a preset voltage threshold.
By implementing the method, when the main relay of the battery pack is disconnected due to the fact that the vehicle is charged in a fault, the power device in the motor controller is controlled to be forbidden to be turned on, and the active short-circuit protection scheme is forbidden to be started, so that the motor controller or the power device in the motor controller is prevented from being invalid and even damaged.
As an alternative embodiment, the short-circuit protection device for a motor shown in fig. 4 may further include:
a fourth determining unit 308, configured to determine whether a transient current is detected in the motor controller after the enabling unit 304 enables the active short-circuit protection scheme, where the transient current is a preset current value and a current of a preset generation number;
the output unit 309 is configured to output a prompt message when the fourth determining unit 308 detects the transient current, where the prompt message is used to prompt a user to control a vehicle to slow down so that a motor speed of the vehicle is reduced to be less than or equal to a preset speed threshold;
and a third control unit 310, configured to control the state of the power device in the motor controller to switch off the motor from the on state when it is detected that the rotational speed of the motor of the vehicle is less than or equal to the preset rotational speed threshold, and to deactivate the active short-circuit protection scheme.
By implementing the method, the motor short-circuit protection device can output prompt information to remind a user to control the vehicle to decelerate so as to reduce the rotating speed of the motor to be below a preset rotating speed threshold value; because the rotating speed is reduced, the counter electromotive force generated by the motor is reduced, and then even if the active short-circuit protection scheme is stopped, the smaller counter electromotive force acts on the power device and cannot exceed the voltage resistance of the power device, and the active short-circuit protection scheme is stopped, so that the failure of the motor controller can be avoided, and the safety of the whole vehicle can be protected.
As another alternative embodiment, the short-circuit protection device for a motor shown in fig. 4 may further include:
an obtaining unit 311, configured to obtain a maximum motor speed and a minimum motor speed of the vehicle in a target time period before the first determining unit 302 determines whether the motor speed of the vehicle is less than or equal to a preset speed threshold; the duration of the target time period is less than or equal to a preset duration threshold;
a calculating unit 312 for calculating an average value of the maximum motor speed and the minimum motor speed within the target time period as the motor speed of the vehicle.
By implementing the above method, a more representative motor speed can be obtained by preferably calculating the maximum motor speed and the minimum motor speed of the vehicle in a short period of time and calculating the average value thereof as the motor speed.
As another alternative embodiment, the short-circuit protection device for a motor shown in fig. 4 may further include:
a fifth judging unit 313, configured to judge whether a difference between the maximum motor speed and the minimum motor speed is less than or equal to a preset difference threshold after the obtaining unit 311 obtains the maximum motor speed and the minimum motor speed of the vehicle within the target time period;
and a calculating unit 312, specifically configured to calculate an average value of the maximum motor speed and the minimum motor speed in the target time period as the motor speed of the vehicle when the fifth determining unit 313 determines that the difference between the maximum motor speed and the minimum motor speed is less than or equal to the preset difference threshold.
By implementing the method, the target time period in which the difference value between the maximum motor rotating speed and the minimum motor rotating speed is greater than the preset difference value threshold can be screened out, and further more representative motor rotating speeds can be determined.
As another optional implementation manner, when the first determining unit 302 determines that the rotational speed of the motor of the vehicle is less than or equal to the preset rotational speed threshold, the first controlling unit 303 is configured to control a power device in the motor controller to prohibit the switching on, and a manner of prohibiting the active short-circuit protection scheme from being enabled specifically is:
the first control unit 303 is configured to control a power device in the motor controller to prohibit switching on and prohibit enabling of an active short-circuit protection scheme when the first determination unit 302 determines that the rotational speed of the motor of the vehicle is zero and is less than a preset rotational speed threshold;
or, the first judging unit 302 is configured to control the state of the power device in the motor controller to be switched from the on-state to the off-state when the first judging unit determines that the motor speed of the vehicle is greater than zero and less than or equal to the preset speed threshold, and forbid to enable the active short-circuit protection scheme.
By implementing the method, the power device can be prevented from being invalid and even damaged; in addition, the scheme of forbidding to start the active short-circuit protection can avoid the magnetic steel of the motor from being demagnetized due to transient current, thereby reducing the probability of failure and even damage of the motor controller.
It can be seen that, compared with the implementation of the motor short-circuit protection device described in fig. 3, the implementation of the motor short-circuit protection device described in fig. 4 can also control the power device in the motor controller to prohibit the power device from being turned on and prohibit the active short-circuit protection scheme from being enabled when the main relay of the battery pack is turned off due to the charging failure of the vehicle, so as to avoid the failure or even damage of the motor controller or the power device in the motor controller; and, a more representative motor speed can be obtained by preferably calculating the maximum motor speed and the minimum motor speed of the vehicle in a short period of time and calculating the average value thereof as the motor speed; and, the power device can be avoided from failing or even being damaged; in addition, the scheme of forbidding to start the active short-circuit protection can avoid the magnetic steel of the motor from being demagnetized due to transient current, thereby reducing the probability of failure and even damage of the motor controller.
EXAMPLE five
Referring to fig. 5, fig. 5 is a schematic structural diagram of another short-circuit protection device for a motor according to an embodiment of the present invention. As shown in fig. 5, the short-circuit protection device for a motor may include:
a memory 501 in which executable program code is stored;
a processor 502 coupled to a memory 501;
the processor 502 calls the executable program code stored in the memory 501 to execute any one of the motor short-circuit protection methods shown in fig. 1 to 2.
The embodiment of the invention discloses a computer-readable storage medium which stores a computer program, wherein the computer program enables a computer to execute any one of the motor short-circuit protection methods shown in the figures 1-2.
The embodiment of the present invention also discloses an application publishing platform, wherein the application publishing platform is used for publishing a computer program product, and when the computer program product runs on a computer, the computer is caused to execute part or all of the steps of the method in the above method embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not imply an inevitable order of execution, and the execution order of the processes should be determined by their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated units, if implemented as software functional units and sold or used as a stand-alone product, may be stored in a computer accessible memory. Based on such understanding, the technical solution of the present invention, which is a part of or contributes to the prior art in essence, or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a memory and includes several requests for causing a computer device (which may be a personal computer, a server, a network device, or the like, and may specifically be a processor in the computer device) to execute part or all of the steps of the above-described method of each embodiment of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
The motor short-circuit protection method and device disclosed by the embodiment of the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A method of short circuit protection of an electric machine, the method comprising:
detecting whether a capacitor voltage in a motor controller of a vehicle exceeds a preset voltage threshold; if the rotation speed of the motor of the vehicle is greater than or equal to a preset rotation speed threshold value, judging whether the rotation speed of the motor of the vehicle is less than or equal to the preset rotation speed threshold value;
acquiring the maximum motor speed and the minimum motor speed of the vehicle in a target time period; the duration of the target time period is less than or equal to a preset duration threshold;
judging whether the difference value between the maximum motor rotating speed and the minimum motor rotating speed is smaller than or equal to a preset difference value threshold value or not;
if the difference value between the maximum motor rotating speed and the minimum motor rotating speed is smaller than or equal to a preset difference value threshold value, calculating the average value of the maximum motor rotating speed and the minimum motor rotating speed in the target time period as the motor rotating speed of the vehicle;
and if the rotating speed of the motor of the vehicle is less than or equal to the preset rotating speed threshold value, controlling a power device in the motor controller to prohibit the switching on of the tube and prohibit the active short-circuit protection scheme from being started.
2. The method of claim 1, wherein controlling a power device in the motor controller to inhibit open-circuit and inhibit active short-circuit protection when the motor speed of the vehicle is less than or equal to the preset speed threshold comprises:
when the motor rotating speed of the vehicle is zero and is smaller than the preset rotating speed threshold value, controlling a power device in the motor controller to prohibit the switching on of the tube and prohibiting the active short-circuit protection scheme from being started;
or when the rotating speed of the motor of the vehicle is greater than zero and less than or equal to a preset rotating speed threshold value, controlling the state of a power device in the motor controller to be switched from an open tube to a closed tube, and forbidding to start the active short-circuit protection scheme.
3. The method of claim 1, further comprising:
and if the rotating speed of the motor of the vehicle is greater than the preset rotating speed threshold value, starting the active short-circuit protection scheme.
4. The method of claim 3, wherein after the enabling the active short-circuit protection scheme, the method further comprises:
judging whether transient current is detected in the motor controller, wherein the transient current is a preset current value and current of preset generation times;
if the transient current is detected, outputting prompt information, wherein the prompt information is used for prompting a user to control the vehicle to decelerate so as to make the motor rotating speed of the vehicle to be reduced to be less than or equal to the preset rotating speed threshold value;
and when the rotating speed of the motor of the vehicle is detected to be less than or equal to the preset rotating speed threshold value, controlling the state of a power device in the motor controller to be switched off by switching on the power device, and deactivating the active short-circuit protection scheme.
5. A short circuit protection device for an electric machine, the device comprising:
a first detection unit for detecting whether a capacitor voltage in a motor controller of a vehicle exceeds a preset voltage threshold;
the acquiring unit is used for acquiring the maximum motor rotating speed and the minimum motor rotating speed of the vehicle in a target time period before the first judging unit judges whether the motor rotating speed of the vehicle is less than or equal to a preset rotating speed threshold value; the duration of the target time period is less than or equal to a preset duration threshold;
the third judging unit is used for judging whether the difference value between the maximum motor rotating speed and the minimum motor rotating speed is smaller than or equal to a preset difference threshold value or not after the acquiring unit acquires the maximum motor rotating speed and the minimum motor rotating speed of the vehicle in a target time period;
a calculating unit configured to calculate an average value of a maximum motor speed and a minimum motor speed in the target time period as a motor speed of the vehicle;
a first judging unit, configured to judge whether a motor rotation speed of a vehicle is less than or equal to a preset rotation speed threshold when the first detecting unit detects that a capacitor voltage in a motor controller of the vehicle exceeds the preset voltage threshold;
and the first control unit is used for controlling a power device in the motor controller to prohibit the switching on and prohibit the active short-circuit protection scheme from being started when the first judgment unit judges that the rotating speed of the motor of the vehicle is less than or equal to the preset rotating speed threshold value.
6. The apparatus according to claim 5, wherein the first control unit is configured to, when the first determination unit determines that the motor speed of the vehicle is less than or equal to the preset speed threshold, control a power device in the motor controller to prohibit switching on the power device, and prohibit enabling the active short-circuit protection scheme specifically:
the first control unit is used for controlling a power device in the motor controller to prohibit the switching on and prohibit the active short-circuit protection scheme from being started when the first judging unit judges that the motor rotating speed of the vehicle is zero and is smaller than the preset rotating speed threshold value;
or, the controller is configured to control the state of a power device in the motor controller to be switched from an open tube to a closed tube and prohibit the active short-circuit protection scheme from being enabled when the first determination unit determines that the motor speed of the vehicle is greater than zero and less than or equal to a preset speed threshold.
7. The apparatus of claim 5, further comprising:
and the starting unit is used for starting the active short-circuit protection scheme when the first judging unit judges that the rotating speed of the motor of the vehicle is greater than the preset rotating speed threshold value.
8. The apparatus of claim 7, further comprising:
a second determining unit, configured to determine whether a transient current is detected in the motor controller after the active short-circuit protection scheme is started by the starting unit, where the transient current is a preset current value and a current generated for a preset number of times;
the output unit is used for outputting prompt information when the second judging unit detects the transient current, and the prompt information is used for prompting a user to control the vehicle to reduce the speed so as to reduce the motor speed of the vehicle to be less than or equal to the preset speed threshold;
and the second control unit is used for controlling the state of a power device in the motor controller to be switched off by switching on and switching off the tube when the motor rotating speed of the vehicle is detected to be less than or equal to the preset rotating speed threshold value, and the active short-circuit protection scheme is stopped.
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| CN112034384B (en) * | 2020-08-05 | 2023-12-26 | 苏州汇川联合动力系统股份有限公司 | Method, apparatus and computer readable storage medium for identifying motor system short circuit |
| CN112572151A (en) * | 2020-10-30 | 2021-03-30 | 深圳市禾望电气股份有限公司 | Active short-circuit protection method and controller for motor and motor control system |
| CN112615353B (en) * | 2020-12-04 | 2022-07-12 | 珠海格力电器股份有限公司 | Overvoltage protection method and device, electronic equipment and storage medium |
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| CN107148745A (en) * | 2014-12-25 | 2017-09-08 | 爱信艾达株式会社 | Rotary electric machine controller |
| CN108809156A (en) * | 2018-06-28 | 2018-11-13 | 同济大学 | A kind of method, storage medium and equipment for controlling motor |
| CN108944571A (en) * | 2018-07-04 | 2018-12-07 | 北京新能源汽车股份有限公司 | Method of controlling security, system and the vehicle of vehicle-mounted motor |
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