CN107696868A - Electric vehicle overspeed fault processing method and device and vehicle-mounted equipment - Google Patents
Electric vehicle overspeed fault processing method and device and vehicle-mounted equipment Download PDFInfo
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- CN107696868A CN107696868A CN201710912009.3A CN201710912009A CN107696868A CN 107696868 A CN107696868 A CN 107696868A CN 201710912009 A CN201710912009 A CN 201710912009A CN 107696868 A CN107696868 A CN 107696868A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/421—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2250/00—Driver interactions
- B60L2250/10—Driver interactions by alarm
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a method and a device for processing an overspeed fault of an electric vehicle and vehicle-mounted equipment, wherein the method for processing the overspeed fault of the electric vehicle comprises the following steps: acquiring the rotating speed of a driving motor of the electric automobile; and carrying out corresponding processing on the electric automobile according to the rotating speed of the driving motor. In the embodiment of the invention, the electric automobile is processed differently according to different rotating speeds of the driving motor of the electric automobile, so that the overspeed of the electric automobile is safely and effectively processed, and the safety of the automobile is ensured.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a device for processing an overspeed fault of an electric automobile and vehicle-mounted equipment.
Background
In the face of increasingly severe energy and environmental problems, energy-saving and new energy automobiles are becoming hot spots for research in various countries. In China, energy-saving and new energy automobiles are highly valued by governments and industries and are considered as one of strategic emerging industries. As one of energy-saving and new energy vehicles, the pure electric vehicle has the advantages of no exhaust emission, high energy efficiency, low noise, energy recycling and the like in the driving process, so that the great development of the pure electric vehicle has great significance for energy safety and environmental protection in China.
The pure electric vehicle drives wheels through a motor to realize vehicle running, the motor is used as a core component of the pure electric vehicle to greatly influence the performance of the whole vehicle, wherein a permanent magnet synchronous motor (PMSM for short) is the mainstream of a pure electric vehicle driving system at present due to the advantages of high efficiency, high output torque, high power density, good dynamic performance and the like. The safety and reliability are the basic requirements of the normal operation of the pure electric vehicle, and the realization of correct, effective and safe functions of the driving motor in the vehicle is the premise of ensuring the safe operation of the vehicle.
For a pure electric vehicle, the risk of vehicle out of control is increased when the speed of the vehicle exceeds a normal range, and for the pure electric vehicle equipped with a permanent magnet synchronous motor, when the rotating speed of the motor seriously exceeds the normal range, deep weak magnetic control failure may be caused, further unexpected output of torque is caused, and in addition, when the motor is over-speed seriously, a lubrication problem is also caused, further irreversible substantive damage such as burning of a driving motor is caused. In the case of pure electric vehicles, in view of the serious consequences that can arise from an overspeed of the electric machine, a safe and effective measure for the overspeed must be provided.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present invention is to provide a method for processing an overspeed fault of an electric vehicle, so as to perform safe and effective processing for overspeed of the electric vehicle, thereby ensuring vehicle safety.
The second purpose of the invention is to provide a processing device for the overspeed fault of the electric automobile.
A third object of the present invention is to provide an in-vehicle apparatus.
A fourth object of the invention is to propose a non-transitory computer-readable storage medium.
A fifth object of the invention is to propose a computer program product.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for processing an overspeed fault of an electric vehicle, including:
acquiring the rotating speed of a driving motor of the electric automobile;
and carrying out corresponding processing on the electric automobile according to the rotating speed of the driving motor.
According to the processing method for the overspeed fault of the electric automobile, disclosed by the embodiment of the invention, the electric automobile is subjected to different processing according to different rotating speeds of the driving motor of the electric automobile, so that the overspeed of the electric automobile is safely and effectively processed, and the safety of a vehicle is ensured.
In order to achieve the above object, a second embodiment of the present invention provides a processing apparatus for an overspeed fault of an electric vehicle, including:
the acquisition module is used for acquiring the rotating speed of a driving motor of the electric automobile;
and the processing module is used for carrying out corresponding processing on the electric automobile according to the rotating speed of the driving motor.
According to the processing device for the overspeed fault of the electric automobile, disclosed by the embodiment of the invention, different processing is carried out on the electric automobile according to different rotating speeds of the driving motor of the electric automobile, so that the overspeed of the electric automobile is safely and effectively processed, and the safety of a vehicle is ensured.
To achieve the above object, a third aspect of the present invention provides an in-vehicle apparatus, including: the device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program so as to realize the processing method of the overspeed fault of the electric automobile.
To achieve the above object, a fourth aspect of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for handling an overspeed fault of an electric vehicle according to the first aspect of the present invention.
To achieve the above object, a fifth embodiment of the present invention provides a computer program product, wherein when the instructions in the computer program product are executed by a processor, the method for processing the overspeed fault of the electric vehicle according to the first embodiment of the present invention is performed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a method for processing an overspeed fault of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a system architecture diagram of an electric vehicle to which the method for processing an overspeed fault of an electric vehicle according to the embodiment of the present invention is applied;
FIG. 3 is a schematic flow chart of another method for handling an overspeed fault of an electric vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an active short circuit of a permanent magnet synchronous motor of an electric vehicle;
FIG. 5 is a schematic diagram of a demagnetization process of the driving motor;
FIG. 6 is a schematic diagram illustrating the operation principle of determining whether to allow the active short-circuit operation according to the current temperature of the driving motor; and
fig. 7 is a schematic structural diagram of a processing device for an overspeed fault of an electric vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a processing method and device for an electric vehicle overspeed fault and vehicle-mounted equipment according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for processing an overspeed fault of an electric vehicle according to an embodiment of the present invention. As shown in fig. 1, the processing method of the overspeed fault of the electric vehicle includes the following steps:
and S101, acquiring the rotating speed of a driving motor of the electric automobile.
And S102, performing corresponding processing on the electric automobile according to the rotating speed of the driving motor.
Specifically, the rotating speed of a driving motor of the electric automobile is obtained in real time, the overspeed degree of the driving motor is determined according to the obtained rotating speed of the driving motor, potential hazards possibly caused by different overspeed degrees are different in degree, and the electric automobile is correspondingly processed according to different hazard degrees.
The method for processing the overspeed fault of the electric automobile is suitable for the pure electric automobile with the system architecture shown in figure 2. As shown in fig. 2, according to the framework, a Vehicle Control Unit (VCU) dominates the implementation of various functions of the Vehicle, wherein the Vehicle Control Unit performs information interaction with a Battery Management System (BMS), a Motor Controller (MCU) and other systems, and implements Vehicle Control, such as powering on and powering off, fault detection and processing, according to a predetermined Control logic; the battery management system BMS mainly realizes the control of the power battery and ensures the normal work of the power battery, such as charging, discharging, battery temperature control and the like; and the Motor controller MCU calculates the required torque according to the VCU command (enable) of the vehicle controller, the information of a gear, an accelerator pedal and the like, controls the Motor to normally work (output the expected torque) on the basis, and simultaneously completes the detection and processing of the faults of the driving system. The Motor in the system frame shown in fig. 2 may be a permanent magnet synchronous Motor, and is connected to the wheel through a single-stage reducer to fix the reduction ratio.
In the embodiment, different processing is performed on the electric automobile according to different rotating speeds of the driving motor of the electric automobile, so that the overspeed of the electric automobile is safely and effectively processed, and the safety of the automobile is ensured.
For clarity of the above embodiment, the present embodiment provides another method for handling an overspeed fault of an electric vehicle. Fig. 3 is a schematic flow chart of another method for processing an overspeed fault of an electric vehicle according to an embodiment of the present invention. As shown in fig. 3, the method for processing the overspeed fault of the electric vehicle may include the following steps:
s301, the rotating speed of a driving motor of the electric automobile is obtained.
Specifically, step S301 is the same as step S101 in the embodiment shown in fig. 1, and is not repeated here.
Step S102 in the embodiment shown in fig. 1 may specifically include the following step S302.
And S302, performing corresponding fault alarm processing and power limitation processing on the electric automobile according to the rotating speed of the driving motor.
Specifically, this step S302 shows a possible implementation of the processing performed on the electric vehicle in step S102, and specifically, the corresponding fault alarm processing and power limitation processing may be performed on the electric vehicle.
Further, in a possible implementation manner of the embodiment of the present invention, the step S302 may specifically include the following steps: if the rotating speed of the driving motor is in a slight overspeed interval, prompting the driver of slight overspeed through instrument characters and an instrument overspeed alarm lamp; or if the rotating speed of the driving motor is in the middle overspeed interval, prompting the driver of middle overspeed through instrument characters, an instrument overspeed alarm lamp and an alarm sound, and limiting the output torque of the electric automobile to be 0 according to a certain gradient; or if the rotating speed of the driving motor is in the severe overspeed interval, prompting the driver of severe overspeed through instrument characters, a driving system fault lamp and alarm sound, and executing active short-circuit operation on the electric automobile.
Specifically, the overspeed degree, that is, which overspeed interval is located, may be determined according to the obtained rotation speed of the drive motor, and different processing methods may be adopted according to different overspeed degrees. According to the embodiment of the invention, the overspeed is divided into three intervals according to the rotating speed of the driving motor, and the three intervals are as follows:
when the rotating speed of the driving motor is less than the rotating speed R1 of the driving motor corresponding to the rated maximum design speed of the electric automobile, namely when the rotating speed of the driving motor is in the range of 0-R1, the driving motor is in the range which can be reached by the rotating speed of the driving motor when the automobile normally runs, and the driving motor belongs to a normal state.
1) Interval of slight overspeed
The rotating speed of the driving motor corresponding to the slight overspeed interval is greater than the rotating speed R1 of the driving motor corresponding to the rated maximum design speed of the electric automobile and is less than or equal to the rotating speed R2 of the driving motor corresponding to the actual maximum design speed of the electric automobile, namely the rotating speed of the driving motor is in the range of R1-R2. The interval is a rotating speed range interval which can be actually reached by the vehicle, namely the interval is a design allowance of the highest vehicle speed of the vehicle. The motor controller in the interval can realize normal control of the motor, such as deep flux weakening control and the like, but because the rotating speed exceeds the rotating speed R1 of the driving motor corresponding to the rated maximum design speed of the electric automobile, certain treatment is required for safety, and the rotating speed of the motor is limited to be increased continuously.
In this rotational speed range, the potential hazard caused by the motor rotational speed is small, and therefore the hazard level is determined to be mild. At this rotational speed interval, the hypervelocity amplitude is less, and motor controller can realize the normal control to the motor, consequently only through instrument characters and the mild hypervelocity of instrument warning light suggestion driver just can satisfy the safe driving demand, can not destroy driver's driving impression simultaneously. The treatment method can be specifically as follows: the instrument words prompt the driver to 'speed the vehicle over speed, please drive safely', and at the same time, the instrument speed alarm lamp is lightened. And (3) power limitation: none.
2) Intermediate overspeed interval
The rotating speed of the driving motor corresponding to the intermediate overspeed interval is greater than the rotating speed R2 of the driving motor corresponding to the actual maximum design speed of the electric automobile and is less than or equal to the maximum rotating speed R3 of the driving motor under the normal control of the driving motor by the motor controller, namely the rotating speed of the driving motor is in the range of R2-R3. The section is a rotation speed range section which can be reached by the rotation speed of the motor under the abnormal running state of the vehicle, such as wheel slip (ice surface and suspended driving wheel), vehicle downhill and the like. Since the rotation speed exceeds the maximum rotation speed R3 of the driving motor under the normal control of the driving motor by the motor controller, the control strategy fails (such as deep flux weakening control), and the vehicle is exposed to the risk of runaway. Therefore, when the rotating speed of the motor enters the interval, further limiting measures are needed to ensure the driving safety.
In the rotating speed interval, because the rotating speed of the motor is higher, certain potential harm can be caused, and therefore the harm grade is determined to be moderate. In the rotating speed interval, the overspeed amplitude is large, and the overspeed amplitude reaches the limit rotating speed of the motor controller for normally controlling the motor, so that further processing measures are required to be adopted to ensure the driving safety. The treatment method can be specifically as follows: the instrument words prompt the driver that the vehicle is overspeed, the power output is limited, the driver asks for safe driving, the instrument overspeed alarm lamp is lightened, and meanwhile, the alarm sound is sounded. And (3) power limitation: the output torque of the electric vehicle is limited to 0 according to a certain gradient. The torque limiting method is progressive and therefore does not affect the driver's driving experience (the driver may have a psychological expectation of not continuing to accelerate because the vehicle speed has reached or exceeded the vehicle's actual maximum design speed R2).
3) Severe overspeed interval
The rotating speed of the driving motor corresponding to the serious overspeed interval is greater than the highest rotating speed R3 of the driving motor under the normal control of the driving motor by the motor controller, namely the rotating speed of the driving motor is in the range of R3-infinity. The interval is a range interval which can be reached by the rotating speed of the motor in an extreme state of the vehicle, when the rotating speed of the motor exceeds R3, the vehicle is subjected to serious runaway risks, such as failure of a torque control strategy, and therefore, when the rotating speed of the motor enters the interval, emergency treatment measures must be taken to ensure driving safety.
In this speed range, the potential hazard caused by the motor speed is already large, so the hazard level is determined to be severe. In the rotating speed interval, the vehicle is faced with out-of-control, at the moment, the control strategy of the motor in the motor controller is failed (such as deep flux weakening control), at the moment, if a pipe closing fault occurs (an IGBT in the motor controller is closed), the generated back electromotive force and impact current can cause irreversible damage to the motor controller, a power battery and parts connected with a high-voltage bus, and therefore when the rotating speed of the motor is increased to the interval, immediate treatment is needed. The treatment method can be specifically as follows: the instrument words prompt the driver that the vehicle is overspeed seriously and the driver asks for immediate deceleration, lights a fault lamp of a driving system and simultaneously sounds an alarm sound. And (3) power limitation: and executing active short-circuit operation on the electric automobile to ensure driving safety.
In conclusion, processing methods are respectively provided according to different hazard levels of the motor rotating speed, a driver is reminded in the modes of instrument character reminding, lighting of a fault lamp of a driving system and alarm sound warning, and the vehicle and personnel on the vehicle are protected by limiting the vehicle speed to continue rising in multiple modes. The processing method limits the power output of the vehicle more severely according to the deepening of the overspeed hazard degree of the motor, so that the driving feeling of a driver can be protected to the maximum extent on the premise of ensuring the driving safety.
Fig. 4 is a schematic diagram of active short circuit of a permanent magnet synchronous motor of a pure electric vehicle. As shown in fig. 4, when the active short-circuit operation is performed, the three-phase input terminal U, V, W on the right side in fig. 4 is in a short-circuit state, and at this time, the back electromotive force generated by the out-of-control motor speed will not damage the motor controller and the power battery.
In general, the active short circuit of the pure electric vehicle does not harm driving safety and vehicles, so that the active short circuit is applied to a fault mechanism of the pure electric vehicle as a safety state when the vehicles are in fault. But can cause harm under special conditions, such as permanent demagnetization of the permanent magnet under high temperature.
The neodymium iron boron (NdFeB) permanent magnet material is widely applied to a permanent magnet motor in a pure electric vehicle because of high maximum energy product, remanence and coercive force. However, the most prominent disadvantage of the NdFeB permanent magnet material is poor thermal stability. For a PMSM (permanent magnet synchronous motor) driving system of an electric automobile, the operation condition of a motor is complex, the motor is limited by an installation space, the power density of the PMSM is high, the heat dissipation condition is poor, and the PMSM demagnetization fault is easy to occur. Especially for the motor overspeed fault, when the three-phase active short-circuit operation is executed, the steady-state short-circuit current monotonously increases along with the increase of the rotating speed, and quickly reaches the maximum and tends to be stable. The maximum steady-state short-circuit current value is exactly equal to the characteristic current value, as shown in formula (1):
wherein isIndicating steady-state short-circuit current (effective value of phase current), psifDenotes the flux linkage, LdExpressing the direct-axis inductance, the steady-state current is mainly determined by the flux linkage and the direct-axis inductance parameter value according to the formula (1). After the steady state is reached, because the characteristic current of the pure electric vehicle permanent magnet synchronous motor is generally larger, permanent demagnetization of the permanent magnet is easily caused if the temperature of the motor body is higher, and further the performance of the motor is reduced, even the motor cannot be used.
In the treatment of the overspeed fault of the driving motor, the active three-phase short-circuit operation needs to be more careful because the condition of permanent demagnetization of the permanent magnet of the driving motor is easier to achieve in a high-speed state, and particularly, the block diagram shown in fig. 5 is shown. As shown in fig. 5, after the motor is overspeed and is subjected to active short-circuit control and reaches a steady state, the short-circuit current tends to be a characteristic current, and since a certain resistance exists in the motor winding, the current in the winding is finally consumed in the form of heat, which will cause the temperature of the motor to rise.
Establishing d and q axis models of the permanent magnet synchronous motor in an ideal state, wherein a voltage equation is as follows:
wherein u isd、uqRepresenting d, q-axis voltage components, id、iqRepresenting d, q-axis current components, Ld、LqExpressing d and q axis inductances, R expressing winding resistance, p expressing a differential operator, n expressing a motor pole pair number, omega expressing mechanical angular velocity, psifRepresenting a permanent magnet flux linkage.
When the three symmetrical circuits are in a steady state, the following constraint conditions are met:
solving to obtain:
according to the equation (4), when the motor speed is increased to a certain value and then the limit is taken, the equation (4) can be converted into:
as can be seen by comparing with equation (1), after the active short circuit, the current inside the stator winding is mainly d-axis current component, and the demagnetized armature reaction is generated by the current component.
The specific control mode of the active short circuit and the potential hidden trouble of the active short circuit in the overspeed fault state of the motor are introduced, so that the active short circuit control has the risk of demagnetizing the motor if the temperature condition of the motor is met in the high-rotating-speed state. Therefore, if the rotating speed of the driving motor is in the severe overspeed interval, before the active short-circuit operation is performed on the electric automobile, the method further comprises the following steps: judging whether the temperature of the driving motor exceeds a set temperature threshold value or not; if so, limiting the output torque of the electric automobile to be 0 according to a certain gradient; and if not, executing active short-circuit operation on the electric automobile.
Specifically, the processing method includes the steps of firstly judging whether a driving system has a condition of active short-circuit operation (the temperature of a driving motor does not exceed a set temperature threshold) when the driving system is in severe overspeed, enabling the vehicle to enter a safe state through active short-circuit if the condition is met, meanwhile, providing braking assistance for the vehicle through braking torque generated by the active short-circuit, and otherwise, providing guarantee for driving safety through a 0-torque mode.
Fig. 6 is a schematic diagram illustrating an operation principle of determining whether to allow the active short-circuit operation according to the current temperature of the driving motor. Firstly, the motor temperature detection fault is judged, and the current temperature value of the motor cannot be obtained after the fault occurs, so that the active short circuit is prohibited to be used for realizing the vehicle safety state under the condition. If the fault does not occur, whether the driving motor is in an over-temperature state or not is judged, the temperature threshold value is defined as Tc, if the temperature of the motor exceeds the value, the driving motor is considered to be in the over-temperature state, and the temperature of the motor is further increased by considering the active short-circuit operation, so that the active short-circuit is prohibited to be used for realizing the vehicle safety state under the condition. And if the motor is not in an over-temperature state, allowing active short-circuit operation, detecting an active short-circuit control state, finishing the active short-circuit control directly when the active short-circuit control is finished, otherwise, returning to the previous layer, and continuously judging whether the active short-circuit operation is allowed according to the temperature of the driving motor.
In the embodiment, different processing is performed on the electric automobile according to different rotating speeds of the driving motor of the electric automobile, so that the overspeed of the electric automobile is safely and effectively processed, and the safety of the automobile is ensured.
In order to realize the embodiment, the invention further provides a processing device for the overspeed fault of the electric automobile. Fig. 7 is a schematic structural diagram of a processing device for an overspeed fault of an electric vehicle according to an embodiment of the present invention. As shown in fig. 7, the processing device for the overspeed fault of the electric vehicle includes: an acquisition module 71 and a processing module 72.
The obtaining module 71 is configured to obtain a rotation speed of a driving motor of the electric vehicle.
And the processing module 72 is configured to perform corresponding processing on the electric vehicle according to the rotation speed of the driving motor.
Further, in a possible implementation manner of the embodiment of the present invention, the processing module is specifically configured to: and performing corresponding fault alarm processing and power limitation processing on the electric automobile according to the rotating speed of the driving motor.
Further, in a possible implementation manner of the embodiment of the present invention, the processing module is specifically configured to: if the rotating speed of the driving motor is in a slight overspeed interval, prompting the driver of slight overspeed through instrument characters and an instrument overspeed alarm lamp; or if the rotating speed of the driving motor is in the middle overspeed interval, prompting the driver of middle overspeed through instrument characters, an instrument overspeed alarm lamp and an alarm sound, and limiting the output torque of the electric automobile to be 0 according to a certain gradient; or if the rotating speed of the driving motor is in the severe overspeed interval, prompting the driver of severe overspeed through instrument characters, a driving system fault lamp and alarm sound, and executing active short-circuit operation on the electric automobile.
Further, in a possible implementation manner of the embodiment of the present invention, the rotation speed of the driving motor corresponding to the mild overspeed interval is greater than the rotation speed of the driving motor corresponding to the rated maximum design speed of the electric vehicle, and is less than or equal to the rotation speed of the driving motor corresponding to the maximum design speed of the electric vehicle; the rotating speed of the driving motor corresponding to the medium overspeed interval is greater than that of the driving motor corresponding to the highest design speed of the electric automobile and is less than or equal to the highest rotating speed of the driving motor under the normal control of the driving motor by the motor controller; the rotating speed of the driving motor corresponding to the serious overspeed interval is greater than the highest rotating speed of the driving motor under the normal control of the driving motor by the motor controller.
Further, in a possible implementation manner of the embodiment of the present invention, the processing module is further configured to: if the rotating speed of the driving motor is within the severe overspeed interval, judging whether the temperature of the driving motor exceeds a set temperature threshold value or not before performing active short-circuit operation on the electric automobile; if so, limiting the output torque of the electric automobile to be 0 according to a certain gradient; and if not, executing active short-circuit operation on the electric automobile.
It should be noted that the foregoing explanation of the embodiment of the method for processing an overspeed fault of an electric vehicle also applies to the processing apparatus of an overspeed fault of an electric vehicle in this embodiment, and details are not repeated here.
In the embodiment, different processing is performed on the electric automobile according to different rotating speeds of the driving motor of the electric automobile, so that the overspeed of the electric automobile is safely and effectively processed, and the safety of the automobile is ensured.
The present invention also proposes a vehicle-mounted device, comprising: the processor executes the program to realize the processing method of the overspeed fault of the electric vehicle according to the embodiment.
The present invention also proposes a non-transitory computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for handling an overspeed fault of an electric vehicle as in the above embodiment.
The invention also provides a computer program product, and when instructions in the computer program product are executed by a processor, the processing method of the overspeed fault of the electric vehicle as the embodiment is executed.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. The method for processing the overspeed fault of the electric automobile is characterized by comprising the following steps of:
acquiring the rotating speed of a driving motor of the electric automobile;
and carrying out corresponding processing on the electric automobile according to the rotating speed of the driving motor.
2. The processing method according to claim 1, wherein the corresponding processing of the electric vehicle according to the rotation speed of the driving motor comprises:
and performing corresponding fault alarm processing and power limitation processing on the electric automobile according to the rotating speed of the driving motor.
3. The processing method according to claim 2, wherein the performing corresponding fault warning processing and power limiting processing on the electric vehicle according to the rotation speed of the driving motor comprises:
if the rotating speed of the driving motor is within a slight overspeed interval, prompting a driver of slight overspeed through instrument characters and an instrument overspeed alarm lamp; or,
if the rotating speed of the driving motor is within the intermediate overspeed interval, prompting the intermediate overspeed of the driver through instrument characters, an instrument overspeed alarm lamp and an alarm sound, and limiting the output torque of the electric automobile to be 0 according to a certain gradient; or,
and if the rotating speed of the driving motor is in a severe overspeed interval, prompting a driver of severe overspeed through instrument characters, a driving system fault lamp and an alarm sound, and executing active short-circuit operation on the electric automobile.
4. The processing method according to claim 3, wherein the rotation speed of the drive motor corresponding to the light overspeed interval is greater than the rotation speed of the drive motor corresponding to a rated maximum design speed of the electric vehicle and is less than or equal to the rotation speed of the drive motor corresponding to an actual maximum design speed of the electric vehicle;
the rotating speed of the driving motor corresponding to the medium overspeed interval is greater than the rotating speed of the driving motor corresponding to the actual highest design speed of the electric automobile and is less than or equal to the highest rotating speed of the driving motor under the normal control of the driving motor by the motor controller;
and the rotating speed of the driving motor corresponding to the severe overspeed interval is greater than the highest rotating speed of the driving motor under the normal control of the driving motor by the motor controller.
5. The processing method according to claim 3, wherein before performing the active short-circuit operation on the electric vehicle if the rotation speed of the driving motor is within the severe overspeed interval, further comprising:
judging whether the temperature of the driving motor exceeds a set temperature threshold value or not;
if so, limiting the output torque of the electric automobile to be 0 according to a certain gradient;
and if not, executing active short-circuit operation on the electric automobile.
6. A processing device for an overspeed fault of an electric vehicle is characterized by comprising:
the acquisition module is used for acquiring the rotating speed of a driving motor of the electric automobile;
and the processing module is used for carrying out corresponding processing on the electric automobile according to the rotating speed of the driving motor.
7. The processing apparatus as claimed in claim 6, wherein the processing module is specifically configured to:
and performing corresponding fault alarm processing and power limitation processing on the electric automobile according to the rotating speed of the driving motor.
8. The processing apparatus as claimed in claim 7, wherein the processing module is specifically configured to:
if the rotating speed of the driving motor is within a slight overspeed interval, prompting a driver of slight overspeed through instrument characters and an instrument overspeed alarm lamp; or,
if the rotating speed of the driving motor is within the intermediate overspeed interval, prompting the intermediate overspeed of the driver through instrument characters, an instrument overspeed alarm lamp and an alarm sound, and limiting the output torque of the electric automobile to be 0 according to a certain gradient; or,
and if the rotating speed of the driving motor is in a severe overspeed interval, prompting a driver of severe overspeed through instrument characters, a driving system fault lamp and an alarm sound, and executing active short-circuit operation on the electric automobile.
9. The processing device according to claim 8, wherein the rotation speed of the drive motor corresponding to the light overspeed interval is greater than the rotation speed of the drive motor corresponding to a rated maximum design speed of the electric vehicle and is less than or equal to the rotation speed of the drive motor corresponding to the maximum design speed of the electric vehicle;
the rotating speed of the driving motor corresponding to the medium overspeed interval is greater than the rotating speed of the driving motor corresponding to the highest design speed of the electric automobile and is less than or equal to the highest rotating speed of the driving motor under the normal control of the driving motor by the motor controller;
and the rotating speed of the driving motor corresponding to the severe overspeed interval is greater than the highest rotating speed of the driving motor under the normal control of the driving motor by the motor controller.
10. The processing apparatus as in claim 8, wherein the processing module is further configured to: if the rotating speed of the driving motor is within the severe overspeed interval, before the active short-circuit operation is performed on the electric automobile,
judging whether the temperature of the driving motor exceeds a set temperature threshold value or not;
if so, limiting the output torque of the electric automobile to be 0 according to a certain gradient;
and if not, executing active short-circuit operation on the electric automobile.
11. An in-vehicle apparatus, characterized by comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program for implementing the method for handling an overspeed fault of an electric vehicle according to any one of claims 1 to 5.
12. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method for handling an overspeed fault of an electric vehicle according to any one of claims 1 to 5.
13. A computer program product, characterized in that when the instructions in the computer program product are executed by a processor, the processing method of the overspeed fault of the electric vehicle according to any one of claims 1 to 5 is executed.
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| CN201710912009.3A CN107696868A (en) | 2017-09-29 | 2017-09-29 | Electric vehicle overspeed fault processing method and device and vehicle-mounted equipment |
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| CN201710912009.3A CN107696868A (en) | 2017-09-29 | 2017-09-29 | Electric vehicle overspeed fault processing method and device and vehicle-mounted equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725260A (en) * | 2018-07-24 | 2018-11-02 | 北京车和家信息技术有限公司 | Overspeed protection method and device |
| CN111086415A (en) * | 2019-12-20 | 2020-05-01 | 一汽解放汽车有限公司 | Battery charging management method, device, vehicle and storage medium |
| CN112172541A (en) * | 2020-09-28 | 2021-01-05 | 武汉格罗夫氢能汽车有限公司 | Control method for fuel cell hydrogen energy automobile speed limit |
| CN113619394A (en) * | 2021-09-13 | 2021-11-09 | 合众新能源汽车有限公司 | Pure electric vehicle motor overspeed fault protection system and method thereof |
| CN115107911A (en) * | 2021-03-09 | 2022-09-27 | 宏碁股份有限公司 | Antitheft processing method for electric vehicle |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757161A (en) * | 1994-12-01 | 1998-05-26 | Matsushita Electric Industrial Co., Ltd. | Apparatus and method for limiting the speed of an electric motor |
| JP2011109855A (en) * | 2009-11-19 | 2011-06-02 | Fuji Heavy Ind Ltd | Electric vehicle control device |
| WO2015090306A1 (en) * | 2013-12-16 | 2015-06-25 | Schaeffler Technologies AG & Co. KG | Method for determining a rotor temperature of an electric motor in a hybrid drive of a motor vehicle |
| CN105730279A (en) * | 2014-12-12 | 2016-07-06 | 北汽福田汽车股份有限公司 | Overspeed control method and system for electric automobile |
| CN106004520A (en) * | 2016-06-21 | 2016-10-12 | 重庆长安汽车股份有限公司 | Vehicle speed control method, vehicle speed control system and electric vehicle |
| CN107031452A (en) * | 2016-11-23 | 2017-08-11 | 北京新能源汽车股份有限公司 | Motor control method and device |
| CN107112937A (en) * | 2014-11-14 | 2017-08-29 | 爱信艾达株式会社 | Control device for inverter and vehicle console device |
-
2017
- 2017-09-29 CN CN201710912009.3A patent/CN107696868A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757161A (en) * | 1994-12-01 | 1998-05-26 | Matsushita Electric Industrial Co., Ltd. | Apparatus and method for limiting the speed of an electric motor |
| JP2011109855A (en) * | 2009-11-19 | 2011-06-02 | Fuji Heavy Ind Ltd | Electric vehicle control device |
| WO2015090306A1 (en) * | 2013-12-16 | 2015-06-25 | Schaeffler Technologies AG & Co. KG | Method for determining a rotor temperature of an electric motor in a hybrid drive of a motor vehicle |
| CN107112937A (en) * | 2014-11-14 | 2017-08-29 | 爱信艾达株式会社 | Control device for inverter and vehicle console device |
| CN105730279A (en) * | 2014-12-12 | 2016-07-06 | 北汽福田汽车股份有限公司 | Overspeed control method and system for electric automobile |
| CN106004520A (en) * | 2016-06-21 | 2016-10-12 | 重庆长安汽车股份有限公司 | Vehicle speed control method, vehicle speed control system and electric vehicle |
| CN107031452A (en) * | 2016-11-23 | 2017-08-11 | 北京新能源汽车股份有限公司 | Motor control method and device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725260A (en) * | 2018-07-24 | 2018-11-02 | 北京车和家信息技术有限公司 | Overspeed protection method and device |
| CN111086415A (en) * | 2019-12-20 | 2020-05-01 | 一汽解放汽车有限公司 | Battery charging management method, device, vehicle and storage medium |
| CN111086415B (en) * | 2019-12-20 | 2021-11-23 | 一汽解放汽车有限公司 | Battery charging management method, device, vehicle and storage medium |
| CN112172541A (en) * | 2020-09-28 | 2021-01-05 | 武汉格罗夫氢能汽车有限公司 | Control method for fuel cell hydrogen energy automobile speed limit |
| CN115107911A (en) * | 2021-03-09 | 2022-09-27 | 宏碁股份有限公司 | Antitheft processing method for electric vehicle |
| CN115107911B (en) * | 2021-03-09 | 2023-08-08 | 宏碁股份有限公司 | Anti-theft processing method for electric vehicles |
| CN113619394A (en) * | 2021-09-13 | 2021-11-09 | 合众新能源汽车有限公司 | Pure electric vehicle motor overspeed fault protection system and method thereof |
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