CN111641198B - Motor controller, high-voltage bus capacitor discharging method and device thereof and vehicle - Google Patents
Motor controller, high-voltage bus capacitor discharging method and device thereof and vehicle Download PDFInfo
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- CN111641198B CN111641198B CN201910155557.5A CN201910155557A CN111641198B CN 111641198 B CN111641198 B CN 111641198B CN 201910155557 A CN201910155557 A CN 201910155557A CN 111641198 B CN111641198 B CN 111641198B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/12—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
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Abstract
The invention discloses a motor controller, a method and a device for discharging a high-voltage bus capacitor of the motor controller, and a vehicle, wherein the method comprises the following steps of: the motor controller enters a discharging mode, and an initial voltage is applied to the motor controller, wherein the initial voltage comprises a quadrature axis voltage and a direct axis voltage; determining a target switching tube to be turned on in a three-phase bridge of a motor controller according to the position of a motor rotor; determining the opening time of a target switching tube according to the DC bus voltage sampling value, the quadrature axis voltage and the DC axis voltage; opening the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor. According to the method, the motor controller and the motor winding form a discharge loop to discharge the high-voltage bus capacitor of the motor controller, and the passive discharge or the active discharge is not required to be performed through a special discharge device or a discharge circuit, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is not caused.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a discharging method of a high-voltage bus capacitor of a motor controller, a discharging device of the high-voltage bus capacitor of the motor controller, a vehicle and a storage medium.
Background
The motor controller is a control execution part of the new energy automobile drive, and consists of a control board, a drive board, a bus capacitor, a busbar, a power module and the like, wherein the control board plays a main control function. When the new energy automobile stops running and powers down, the high-voltage bus capacitor of the motor controller needs to be discharged so as to quickly reduce the voltage at two ends of the capacitor to be within a safe voltage range, thereby reducing high-voltage risk.
In the related art, a power resistor is generally connected in parallel to two ends of a high-voltage bus capacitor to perform passive discharging, or controlled by a special discharging circuit to perform active discharging.
However, a power resistor is connected in parallel at two ends of the motor controller to perform passive discharge, and because the power resistor is always connected in parallel at two ends of the high-voltage bus capacitor, energy loss exists at all times as long as the motor driving system is electrified to run. If the special bleeder circuit is adopted for active bleeder, a set of control loop special for high-voltage capacitor bleeder needs to be added, so that the cost of the motor controller can be increased, the occupied space can be occupied, and the volume of the motor controller can be increased.
Disclosure of Invention
The present invention aims to solve at least to some extent one of the technical problems in the above-described technology. Therefore, a first object of the present invention is to provide a method for discharging a high-voltage bus capacitor of a motor controller, which uses a motor controller and a motor winding to form a discharging loop to discharge the high-voltage bus capacitor of the motor controller, without performing passive discharging or active discharging through a dedicated discharging device or discharging circuit, without increasing the cost of the motor controller, without occupying space, and without energy loss.
A second object of the present invention is to provide a bleed-off device for a high voltage bus capacitor of a motor controller.
A third object of the present invention is to propose a motor controller.
A fourth object of the present invention is to propose a vehicle.
A fifth object of the present invention is to propose a storage medium.
In order to achieve the above objective, an embodiment of a first aspect of the present invention provides a method for discharging a high-voltage bus capacitor of a motor controller, including the following steps: the method comprises the steps that a motor controller enters a discharging mode, and initial voltage is applied to the motor controller, wherein the initial voltage comprises quadrature axis voltage and direct axis voltage; determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the position of a motor rotor; determining the opening time of the target switching tube according to the DC bus voltage sampling value, the quadrature axis voltage and the DC axis voltage; opening the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor.
According to the method for discharging the high-voltage bus capacitor of the motor controller, when the motor controller enters a discharging mode, initial voltage is applied to the motor controller, then a target switching tube to be opened in a three-phase bridge of the motor controller is determined according to the position of a motor rotor, then the opening time of the target switching tube is determined according to a direct-current bus voltage sampling value, an intersecting axis voltage and a direct axis voltage, the target switching tube is opened according to the opening time, and the high-voltage bus capacitor is discharged through a target passage formed between the three-phase bridge and the motor. According to the method, the motor controller and the motor winding form a discharge loop to discharge the high-voltage bus capacitor of the motor controller, and the passive discharge or the active discharge is not required to be performed through a special discharge device or a discharge circuit, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is not caused.
In addition, the method for discharging the high-voltage bus capacitor of the motor controller according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, the determining, according to a motor rotor position, a target switching tube to be turned on in a three-phase bridge of the motor controller includes: judging a sector of a motor rotor voltage axis in an SVPWM (Space Vector Pulse Width Modulation ) mode according to the motor rotor position; and determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the sector.
According to one embodiment of the invention, the motor controller enters a bleed mode comprising: and receiving a parking instruction, wherein the gear of the vehicle is the P gear.
According to an embodiment of the present invention, the method for discharging the high-voltage bus capacitor of the motor controller further includes: and when the current DC bus voltage sampling value of the motor controller is in a preset range, completing the discharging.
In order to achieve the above object, a second aspect of the present invention provides a bleed device for a high voltage bus capacitor of a motor controller, including: the application module is used for applying initial voltage to the motor controller when the motor controller is judged to enter a release mode, wherein the initial voltage comprises a quadrature axis voltage and a direct axis voltage; the first determining module is used for determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the position of a motor rotor; the second determining module is used for determining the opening time of the target switching tube according to the direct-current bus voltage sampling value, the quadrature axis voltage and the direct axis voltage; the control module is used for opening the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor.
According to the high-voltage bus capacitor discharging device of the motor controller, when the motor controller is judged to enter the discharging mode, the applying module applies initial voltage to the motor controller, the first determining module determines a target switching tube to be opened in a three-phase bridge of the motor controller according to the motor rotor position, the second determining module determines the opening time of the target switching tube according to the direct-current bus voltage sampling value, the quadrature axis voltage and the direct axis voltage, and the control module opens the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor. Therefore, the device utilizes the motor controller and the motor winding to form a discharge loop to discharge the high-voltage bus capacitor of the motor controller, does not need to perform passive discharge or active discharge through a special discharge device or a discharge circuit, does not increase the cost of the motor controller, occupies no space, and has no energy loss.
In addition, the bleed device of the high-voltage bus capacitor of the motor controller according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, the first determining module is further configured to: and judging a sector where a motor rotor voltage axis is positioned in an SVPWM mode according to the motor rotor position, and determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the sector.
According to one embodiment of the invention, when a parking instruction is received and the gear of the vehicle is the P gear, the application module judges that the motor controller enters a release mode.
According to one embodiment of the invention, the current DC bus voltage sampling value of the motor controller is in a preset range, and the control module judges that the high-voltage bus capacitor is completely discharged.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides a motor controller, including a discharging device for a high-voltage bus capacitor of the motor controller according to the embodiment of the second aspect of the present invention.
According to the motor controller provided by the embodiment of the invention, the high-voltage bus capacitor of the motor controller is discharged by utilizing the discharge loop formed by the motor controller and the motor winding through the discharge device of the high-voltage bus capacitor of the motor controller, and the motor controller does not need to be subjected to passive discharge or active discharge through a special discharge device or a discharge circuit, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is avoided.
To achieve the above object, a fourth aspect of the present invention provides a vehicle including the motor controller according to the third aspect of the present invention.
According to the vehicle provided by the embodiment of the invention, the motor controller and the motor winding form the bleeder circuit to bleeder the high-voltage bus capacitor of the motor controller, and the special bleeder device or bleeder circuit is not needed for passive bleeder or active bleeder, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is avoided.
To achieve the above object, a fifth embodiment of the present invention provides a storage medium having a computer program stored thereon, which when executed by a processor, implements a method for discharging a high-voltage bus capacitor of a motor controller according to the first embodiment of the present invention.
When the computer program stored on the storage medium is executed by the processor, when the motor controller enters a bleeder mode, initial voltage is applied to the motor controller, then a target switching tube to be switched on in a three-phase bridge of the motor controller is determined according to the position of a motor rotor, then the switching-on time of the target switching tube is determined according to a direct-current bus voltage sampling value, a quadrature axis voltage and a direct axis voltage, and the target switching tube is switched on according to the switching-on time, so that a high-voltage bus capacitor is bleeder through a target passage formed between the three-phase bridge and the motor, and a special bleeder device or a bleeder circuit is not needed for passive bleeder or active bleeder, so that the cost of the motor controller is not increased, the space is not occupied, and no energy loss exists.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and may be better understood from the following description of embodiments with reference to the accompanying drawings, in which,
FIG. 1 is a flow chart of a method of bleeding high voltage bus capacitance of a motor controller according to one embodiment of the present invention;
FIG. 2 is a circuit topology of a motor controller according to one embodiment of the invention;
FIG. 3 is a schematic diagram of a sector of an SVPWM control scheme according to one embodiment of the invention;
FIG. 4 is a flow chart of a method of bleeding high voltage bus capacitance of a motor controller according to one specific example of the present application;
fig. 5 is a block schematic diagram of a bleed arrangement of a high voltage bus capacitor of a motor controller according to one embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a method for discharging a high-voltage bus capacitor of a motor controller, a device for discharging a high-voltage bus capacitor of a motor controller, a vehicle, and a storage medium according to embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a flow chart of a method of bleeding high voltage bus capacitance of a motor controller according to one embodiment of the present invention. As shown in fig. 1, the method comprises the steps of:
s1, the motor controller enters a release mode, and an initial voltage is applied to the motor controller. The initial voltages include an quadrature voltage Ud and a direct voltage Uq.
The initial voltage may be preset according to the actual situation, e.g. Ud = -5v, uq = 0.
In one embodiment of the present invention, the motor controller entering the bleed mode may include: and receiving a parking instruction, wherein the gear of the vehicle is the P gear.
S2, determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the position of the motor rotor.
Further, according to an embodiment of the present invention, determining a target switching tube to be turned on in a three-phase bridge of a motor controller according to a motor rotor position includes: judging a sector where a motor rotor voltage axis is located in an SVPWM mode according to the motor rotor position; and determining a target switching tube to be turned on in the three-phase bridge of the motor controller according to the sector.
And S3, determining the opening time of the target switching tube according to the DC bus voltage sampling value Udc, the quadrature axis voltage Ud and the DC axis voltage Uq.
And S4, opening the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor.
Specifically, as shown in fig. 2, the circuit topology of the motor controller may be shown with reference to fig. 2, and the motor controller 1 may include a three-phase bridge 101 and a high-voltage bus capacitor Cr, where the three-phase bridge 101 is a A, B, C three-phase bridge arm composed of six switching tubes. In addition, the Battery is a power Battery, the motor is 3, the controllable switch is K, and a, b and c are three-phase power supply access ends of the motor respectively. When the vehicle stops running and is powered down, the high-voltage bus capacitor Cr of the motor controller needs to be discharged so as to quickly reduce the voltage at two ends of the capacitor to be within a safe voltage range, and therefore high-voltage risks are reduced.
Therefore, in the invention, when a parking instruction is received and the gear of the vehicle is the P gear, the motor controller continues to supply the voltage (12V) after the vehicle is stopped, and the motor controller performs the release mode. After entering the release mode, applying a preset quadrature axis voltage Ud and a preset direct axis voltage Uq to the motor controller, and then acquiring the position of the motor rotor. As shown in fig. 3, since the position of the motor rotor is known, that is, the position of the voltage synthesis vector Us of the motor rotor voltage in the SVPWM mode can be known, the sector in which the motor rotor voltage axis is located in the SVPWM mode can be known. In fig. 3, us is a voltage synthesis vector of a motor rotor voltage axis in a two-phase stationary coordinate system (α, β), and (1, 0) represents an on-off state of a switching tube, that is, an a-phase upper bridge is on, a B-phase lower bridge is on, and a C-phase lower bridge is on; (0, 1, 0) represents that the lower bridge of the A phase is opened, the upper bridge of the B phase is opened, and the lower bridge of the C phase is opened. Other definitions are similar, SVPWM vector control for motors is prior art, and detailed description thereof is omitted herein. After the sector of the motor rotor voltage axis in the SVPWM mode is obtained, the switching sequence of the switching tubes in the three-phase bridge can be obtained, so that the target switching tube to be opened is determined, and the discharge loop of the high-voltage bus capacitor is determined. After determining the target switching tube, the on time of the target switching tube is also required to be determined, and the on time can be determined according to the DC bus voltage sampling value Udc, the quadrature axis voltage Ud, the DC axis voltage Uq of the motor controller, the sector where the motor rotor voltage axis is located in the SVPWM mode and the carrier period. The on time is determined, namely the duty ratio of the target switching tube is determined, the target switching tube is controlled to be turned on according to the duty ratio, and a discharge loop formed between the three-phase bridge and the motor discharges the high-voltage bus capacitor. According to the method, the motor controller and the motor winding form a discharge loop to discharge the high-voltage bus capacitor of the motor controller, and the passive discharge or the active discharge is not required to be performed through a special discharge device or a discharge circuit, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is not caused.
According to an embodiment of the present invention, the method for discharging the high-voltage bus capacitor of the motor controller further includes: and when the current DC bus voltage sampling value of the motor controller is in a preset range, the bleeding is completed.
Specifically, the preset range can be set according to practical situations, for example, the preset range is smaller than 60V, if the current dc bus voltage sampling value Udc of the motor controller is smaller than 60V, the high-voltage bus capacitor is indicated to complete the discharging, the power-off processing is performed, all the switching tubes are controlled to be turned off, and the low-voltage power supply is stopped.
In order for those skilled in the art to more clearly understand the present invention, the following description is made with reference to fig. 4. Fig. 4 is a flow chart of a method of bleeding high voltage bus capacitance of a motor controller according to one specific example of the present application. As shown in fig. 4, the method may include the steps of:
s101, receiving a parking instruction, wherein the gear of the vehicle is the P gear, and the motor controller enters a release mode.
S102, applying an initial voltage to a motor controller.
S103, judging the sector where the motor rotor voltage axis is located in the SVPWM mode according to the motor rotor position.
S104, determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the sector.
S105, determining the opening time of the target switching tube according to the DC bus voltage sampling value Udc, the quadrature axis voltage Ud and the DC axis voltage Uq.
And S106, opening the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor.
S107, judging whether the current DC bus voltage sampling value of the motor controller is in a preset range. If yes, go to step S108; if not, return to step S106.
S108, completing the discharging and performing power-off processing.
In summary, according to the method for discharging the high-voltage bus capacitor of the motor controller in the embodiment of the invention, when the motor controller enters the discharging mode, an initial voltage is applied to the motor controller, then a target switching tube to be opened in a three-phase bridge of the motor controller is determined according to the motor rotor position, then the opening time of the target switching tube is determined according to the direct-current bus voltage sampling value, the quadrature axis voltage and the direct axis voltage, and the target switching tube is opened according to the opening time, so that the high-voltage bus capacitor is discharged through a target passage formed between the three-phase bridge and the motor. According to the method, the motor controller and the motor winding form a discharge loop to discharge the high-voltage bus capacitor of the motor controller, and the passive discharge or the active discharge is not required to be performed through a special discharge device or a discharge circuit, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is not caused.
With the above-mentioned method for discharging the high-voltage bus capacitor of the motor controller, the embodiment of the invention also provides a device for discharging the high-voltage bus capacitor of the motor controller, which can be configured to execute the method embodiment disclosed by the invention. For details not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Fig. 5 is a block schematic diagram of a bleed arrangement of a high voltage bus capacitor of a motor controller according to one embodiment of the invention. As shown in fig. 5, the apparatus includes: the application module 10, the first determination module 20, the second determination module 30, and the control module 40.
The applying module 10 is configured to apply an initial voltage to the motor controller when the motor controller is determined to enter the bleed mode, where the initial voltage includes a quadrature axis voltage and a direct axis voltage. The first determining module 20 is configured to determine a target switching tube to be turned on in a three-phase bridge of the motor controller according to a motor rotor position. The second determining module 30 is configured to determine the on time of the target switching tube according to the dc bus voltage sampling value, the quadrature axis voltage and the dc axis voltage. The control module 40 is configured to turn on the target switching tube according to the on time, so as to bleed the high-voltage bus capacitor through a target path formed between the three-phase bridge and the motor.
Further, in an embodiment of the present invention, the first determining module 20 is further configured to: and judging the sector of the voltage axis of the motor rotor in the SVPWM mode according to the position of the motor rotor, and determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the sector.
According to one embodiment of the present invention, when a parking instruction is received and the gear of the vehicle is the P gear, the applying module 10 determines that the motor controller enters the bleeding mode.
Specifically, when a parking instruction is received and the gear of the vehicle is P gear, the application module 10 determines that the motor controller is in the release mode after the vehicle is stopped and the low voltage power (12V) is continuously supplied. After entering the bleed-off mode, the applying module 10 applies a preset quadrature axis voltage Ud and a preset direct axis voltage Uq to the motor controller, and then the first determining module 20 obtains the position of the motor rotor, determines the sector where the motor rotor voltage axis is located in the SVPWM mode according to the position of the motor rotor, and obtains the switching sequence of the switching tubes in the three-phase bridge according to the sector, thereby determining the target switching tube to be turned on and determining the bleed-off loop of the high-voltage bus capacitor. After determining the target switching tube, the second determining module 30 may determine the on time of the target switching tube according to the dc bus voltage sampling value Udc, the quadrature axis voltage Ud, the direct axis voltage Uq, the sector and the carrier period where the motor rotor voltage axis is in the SVPWM mode of the motor controller. The on time is determined, namely the duty ratio of the target switching tube is determined, the control module 40 controls the target switching tube to be turned on according to the duty ratio, and a discharging loop formed between the three-phase bridge and the motor discharges the high-voltage bus capacitor. The device utilizes motor controller and motor winding to constitute the high-voltage bus capacitor of releasing the return circuit to the motor controller and releases, need not to carry out passive release or initiative release through special bleeder device or bleeder circuit, neither can increase motor controller's cost nor occupation space, and does not have the energy loss.
According to one embodiment of the present invention, the control module 40 determines that the high voltage bus capacitor is discharged when the current dc bus voltage sample value of the motor controller is within the preset range.
In summary, according to the high-voltage bus capacitor discharging device of the motor controller, when the applying module judges that the motor controller enters the discharging mode, initial voltage is applied to the motor controller, the first determining module determines a target switching tube to be opened in a three-phase bridge of the motor controller according to the motor rotor position, the second determining module determines opening time of the target switching tube according to a direct-current bus voltage sampling value, quadrature axis voltage and direct axis voltage, and the control module opens the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor. Therefore, the device utilizes the motor controller and the motor winding to form a discharge loop to discharge the high-voltage bus capacitor of the motor controller, does not need to perform passive discharge or active discharge through a special discharge device or a discharge circuit, does not increase the cost of the motor controller, occupies no space, and has no energy loss.
In addition, the embodiment of the invention also provides a motor controller, which comprises the discharge device of the high-voltage bus capacitor of the motor controller.
According to the motor controller provided by the embodiment of the invention, the high-voltage bus capacitor of the motor controller is discharged by utilizing the discharge loop formed by the motor controller and the motor winding through the discharge device of the high-voltage bus capacitor of the motor controller, and the motor controller does not need to be subjected to passive discharge or active discharge through a special discharge device or a discharge circuit, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is avoided.
The embodiment of the invention also provides a vehicle comprising the motor controller.
According to the vehicle provided by the embodiment of the invention, the motor controller and the motor winding form the bleeder circuit to bleeder the high-voltage bus capacitor of the motor controller, and the special bleeder device or bleeder circuit is not needed for passive bleeder or active bleeder, so that the cost of the motor controller is not increased, the space is not occupied, and the energy loss is avoided.
In addition, the embodiment of the invention also provides a storage medium, and a computer program is stored on the storage medium, and when the program is executed by a processor, the method for discharging the high-voltage bus capacitor of the motor controller is realized.
When the computer program stored on the storage medium is executed by the processor, when the motor controller enters a bleeder mode, initial voltage is applied to the motor controller, then a target switching tube to be switched on in a three-phase bridge of the motor controller is determined according to the position of a motor rotor, then the switching-on time of the target switching tube is determined according to a direct-current bus voltage sampling value, a quadrature axis voltage and a direct axis voltage, and the target switching tube is switched on according to the switching-on time, so that a high-voltage bus capacitor is bleeder through a target passage formed between the three-phase bridge and the motor, and a special bleeder device or a bleeder circuit is not needed for passive bleeder or active bleeder, so that the cost of the motor controller is not increased, the space is not occupied, and no energy loss exists.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (7)
1. The discharging method of the high-voltage bus capacitor of the motor controller is characterized by comprising the following steps of:
the method comprises the steps that a motor controller enters a discharging mode, and initial voltage is applied to the motor controller, wherein the initial voltage comprises quadrature axis voltage and direct axis voltage;
determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the position of a motor rotor;
determining the opening time of the target switching tube according to the DC bus voltage sampling value, the quadrature axis voltage and the DC axis voltage;
opening the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor;
the determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the motor rotor position comprises the following steps:
judging a sector where a motor rotor voltage axis is located in an SVPWM mode according to the motor rotor position;
determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the sector;
the motor controller enters a bleed mode comprising:
and receiving a parking instruction, wherein the gear of the vehicle is the P gear.
2. The method for bleeding high-voltage bus capacitors of a motor controller of claim 1, further comprising:
and when the current DC bus voltage sampling value of the motor controller is in a preset range, completing the discharging.
3. A bleed apparatus for a high voltage bus capacitor of a motor controller, comprising:
the application module is used for applying initial voltage to the motor controller when the motor controller is judged to enter a release mode, wherein the initial voltage comprises a quadrature axis voltage and a direct axis voltage;
the first determining module is used for determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the position of a motor rotor;
the second determining module is used for determining the opening time of the target switching tube according to the direct-current bus voltage sampling value, the quadrature axis voltage and the direct axis voltage;
the control module is used for opening the target switching tube according to the opening time so as to discharge the high-voltage bus capacitor through a target passage formed between the three-phase bridge and the motor;
the first determining module is further configured to: judging a sector where a motor rotor voltage axis is located in an SVPWM mode according to the motor rotor position, and determining a target switching tube to be turned on in a three-phase bridge of the motor controller according to the sector;
and when a parking instruction is received and the gear of the vehicle is the P gear, the application module judges that the motor controller enters a release mode.
4. The device for discharging a high voltage bus capacitor of a motor controller according to claim 3, wherein the current dc bus voltage sampling value of the motor controller is within a preset range, and the control module determines that the high voltage bus capacitor is discharged.
5. A motor controller comprising a bleed arrangement of the high voltage bus capacitance of the motor controller according to any one of claims 3-4.
6. A vehicle characterized by comprising a motor controller according to claim 5.
7. A storage medium having stored thereon a computer program which when executed by a processor implements a method of discharging a high voltage bus capacitor of a motor controller according to any one of claims 1-2.
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| CN112590565A (en) * | 2020-12-22 | 2021-04-02 | 广州橙行智动汽车科技有限公司 | Control method and device and vehicle |
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| FR2746062B1 (en) * | 1996-03-12 | 1998-06-05 | VEHICLE WITH SYNCHRONOUS ELECTRIC MOTOR | |
| JP2004015892A (en) * | 2002-06-05 | 2004-01-15 | Toshiba Corp | Inverter controlling device and electric vehicle |
| US7944160B2 (en) * | 2008-03-12 | 2011-05-17 | GM Global Technology Operations LLC | Redundant DC bus discharge for an electric motor system |
| JP5375051B2 (en) * | 2008-11-28 | 2013-12-25 | 日産自動車株式会社 | Inverter discharge device |
| JP5418416B2 (en) * | 2010-06-08 | 2014-02-19 | 株式会社デンソー | Motor control device |
| CN103448556B (en) * | 2013-09-29 | 2015-08-05 | 奇瑞新能源汽车技术有限公司 | A kind of safety relief method of new-energy automobile electric capacity electricity |
| CN108123428B (en) * | 2016-11-29 | 2020-03-03 | 长城汽车股份有限公司 | Voltage discharge method and system of motor controller and vehicle |
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