CN115871466A - Method and fault diagnosis system for double-motor fault diagnosis of electric vehicle - Google Patents
Method and fault diagnosis system for double-motor fault diagnosis of electric vehicle Download PDFInfo
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- CN115871466A CN115871466A CN202310129088.6A CN202310129088A CN115871466A CN 115871466 A CN115871466 A CN 115871466A CN 202310129088 A CN202310129088 A CN 202310129088A CN 115871466 A CN115871466 A CN 115871466A
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Abstract
The invention relates to a method for double-motor fault diagnosis of an electric vehicle, comprising the following steps: s1: detecting the current of each motor of the double motors of the electric vehicle; s2: detecting the running distance and the running speed of the electric vehicle; s3: determining that the dual motors are in single motor operation if a criterion is met, wherein the criterion comprises a first criterion: the maximum current of one of the dual motors is greater than the run current and the maximum current of the other of the dual motors is less than the idle current. The invention also relates to a fault diagnosis system for dual-motor fault diagnosis of an electric vehicle, a computer program product, such as a computer readable program carrier, and an electric vehicle. The method and the device can identify the single-motor operation and the single-motor fault in the double motors of the electric vehicle in a reliable mode, and improve the driving safety of the electric vehicle.
Description
Technical Field
The present invention relates to a method for dual-motor fault diagnosis of an electric vehicle, a fault diagnosis system for dual-motor fault diagnosis of an electric vehicle, a computer program product, such as a computer readable program carrier, and an electric vehicle.
Background
With the development of new energy automobile technology, electric automobiles are increasingly put into use. As a core of electric vehicles, dual motor drives are increasingly being used due to high safety and power reserves. However, the operating states of the individual motors in a dual motor are difficult to distinguish from one another with respect to a single motor drive. Therefore, it is difficult to determine the failure of a single motor in a dual motor or the operation of a single motor or a single shaft drive, which presents a safety hazard.
Disclosure of Invention
It is an object of the present invention to provide an improved method for dual motor fault diagnosis of an electric vehicle, an improved fault diagnosis system for dual motor fault diagnosis of an electric vehicle, an improved computer program product, such as a computer readable program carrier, and an improved electric vehicle solving at least some of the problems of the prior art.
According to a first aspect of the present invention, there is provided a method for dual motor fault diagnosis of an electric vehicle, the method comprising the steps of:
s1: detecting the current of each motor of the double motors of the electric vehicle;
s2: detecting the running distance and speed of the electric vehicle;
s3: the dual motors are judged to be in single motor operation if the judgment criteria are met,
wherein the evaluation criterion comprises a first criterion: the maximum current of one of the dual motors is greater than the run current and the maximum current of the other of the dual motors is less than the idle current.
According to an alternative embodiment of the invention, said criterion further comprises a second criterion: the running distance of the electric vehicle is greater than the preset running distance, and the speed of the electric vehicle is greater than the preset speed,
and under the condition that the first criterion and the second criterion are simultaneously met, the double motors are judged to be in single-motor operation.
According to an alternative embodiment of the invention, the method further comprises the steps of:
s4: calculating the single-motor running distance, wherein the single-motor running distance is defined as the running distance of the double motors in the single-motor running period; and/or
And calculating the single-motor running time, wherein the single-motor running time is defined as the running time of the double motors during the single-motor running.
According to an alternative embodiment of the invention, the method further comprises the steps of:
s5: calculating a one-motor travel fraction defined as a percentage of the one-motor travel distance to a total travel distance and/or a percentage of the one-motor travel time to a total travel time,
and when the single-motor running occupation ratio is greater than a preset percentage, judging that the double motors have single-motor faults.
According to an alternative embodiment of the invention, the total distance traveled and/or the total time traveled is recorded if a second criterion is fulfilled.
According to an alternative embodiment of the invention, the method further comprises the steps of:
s6: and giving a warning in case that the double motor is judged to have the single motor fault.
According to a second aspect of the present invention, there is provided a fault diagnosis system for dual-motor fault diagnosis of an electric vehicle for implementing the method according to the first aspect of the present invention, the fault diagnosis system comprising at least:
a current detection element provided so as to be adapted to detect a current of each of the two motors;
a speed sensor configured to detect a speed of the electric vehicle;
an evaluation device is provided which is adapted to determine a single-motor operation and/or a single-motor fault of the double motor on the basis of the measured variables.
According to an alternative embodiment of the invention, the fault diagnosis system further comprises a reminder device arranged to be adapted to display/report a single motor fault warning and/or to send fault information to the assistance facility.
According to a third aspect of the present invention, there is provided a computer program product, such as a computer readable program carrier, having stored thereon computer program instructions, which when executed by a processor, at least assist in carrying out the method according to the first aspect of the present invention.
According to a fourth aspect of the present invention, there is provided an electric vehicle comprising the fault diagnosis system according to the second aspect of the present invention or the computer program product according to the third aspect of the present invention.
The method and the device can identify the single-motor operation and the single-motor fault in the double motors of the electric vehicle in a reliable mode, and improve the driving safety of the electric vehicle.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:
fig. 1 schematically shows a system block diagram of a fault diagnosis system for two-motor fault diagnosis of an electric vehicle according to an embodiment of the present invention.
Fig. 2 schematically shows a flow diagram of a method for dual-motor fault diagnosis of an electric vehicle according to an embodiment of the invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
Fig. 1 is a schematic block diagram of a fault diagnosis system for dual-motor fault diagnosis of an electric vehicle according to an exemplary embodiment of the present invention. As shown in fig. 1, the fault diagnosis system 1 includes a current detection element 10, a speed sensor 20, and an analysis evaluation device 30. Here, the current detecting element 10 is provided to be adapted to detect the current I of each of the two motors, and the speed sensor 20 is provided to be adapted to detect the speed V of the electric vehicle. According to the invention, the evaluation device 30 is designed and adapted to determine a single-motor operation and/or a single-motor malfunction of the double motor on the basis of the measured variables. The parameters for determining the single-motor operation and/or the single-motor failure of the dual motors include, for example, the current I of each motor, the speed V of the electric vehicle, the travel distance D of the electric vehicle, the travel time t of the electric vehicle, and the like. As can also be seen from fig. 1, the fault diagnosis system 1 further comprises a reminder device 40. Alternatively, the reminder device 40 is, for example, a dashboard in an electric vehicle, which is capable of displaying single motor failure information. Therefore, the driver and the passenger can acquire the fault related information so as to take appropriate countermeasures. Alternatively, the reminding device 40 may be an information transmitting device configured to be suitable for transmitting the failure information to an assistance facility, such as a repair shop, a vehicle manufacturer, a rescue center, etc. In this way, the repair shop, the vehicle manufacturer, the rescue center, etc. can process the fault information in advance so as to take corresponding countermeasures in time, such as instructing the driver, navigating to the nearest repair shop or dispatching a rescue vehicle, etc.
Fig. 2 schematically shows a flow chart of a method for dual-motor fault diagnosis of an electric vehicle according to an exemplary embodiment of the present invention. As shown in fig. 2, a method for dual motor fault diagnosis of an electric vehicle according to one embodiment of the present invention includes the steps of:
s1: the current I of each of the double motors of the electric vehicle is detected. Here, the current I of each motor is detected by a current detection element 10 arranged at each motor.
S2: the travel distance D and the travel speed V of the electric vehicle are detected. Here, the speed V of the electric vehicle is detected by the speed sensor 20. The travel distance D of the electric vehicle can be calculated from the measured travel speed V and the travel time t, for example.
S3: and judging that the double motors are in single-motor operation under the condition that the judgment standard is met. According to the invention, said criterion preferably comprises a first criterion C1 and a second criterion C2.
Here, the first criterion C1 is: maximum current I of one of the double motors 1max Greater than the running current I o And the maximum current I of the other of the two motors 2max Less than the idle current I i . That is, the following formula is satisfied:
I 1max >I o and I 2max <I i
Thereby, the less than idling current I is determined i The individual motor of (a) is not operating or is faulty.
Further, the second criterion C2 is: the running distance D of the electric vehicle is larger than the preset running distance D d And the speed V of the electric vehicle is greater than the preset speed V d . That is, the following formula is satisfied:
D>D d and V>V d
This confirms that the running of the electric vehicle is the effective running.
Preferably, the dual motor is determined to be in single-motor operation or single-shaft operation if both the first criterion C1 and the second criterion C2 are met.
S4: calculating the single motor running distance D o The single-motor running distance is defined as the running distance of the double motors during the single-motor running period; and/or
Calculating the single motor running time t o The one-motor travel time is defined as the travel time during which the dual motors are in one-motor operation.
S5: calculating the single-motor running ratio P o The single-motor running ratio is defined as the single-motor running distance D o Distance to total travel D t And/or the one-motor travel time t o And the total travel time t t In a liquid crystal display device, wherein,when the single-motor running ratio P o Greater than a predetermined percentage P d And judging that the double motors have single motor faults. In particular, the total distance traveled D is recorded if the second criterion C2 is fulfilled t And/or total travel time t t . Therefore, it is determined that the single-motor failure exists for the dual motors in the case where the following formula is satisfied:
P o >P d
wherein, P o ＝D o /D t Or P o ＝t o /t t 。
Here, the percentage P is preset d Is a percentage threshold value preset according to different evaluation levels, which is 70%, 80% or 90%, for example.
S6: and giving a warning in case that the double motor is judged to have the single motor fault. Here, a single motor failure warning is displayed/broadcasted by the reminder device 40, or failure information is transmitted to the assistance facility.
In describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
Although specific embodiments of the invention have been described herein in detail, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications may be devised without departing from the spirit and scope of the present invention.
Claims (10)
1. A method for dual motor fault diagnosis of an electric vehicle, the method comprising the steps of:
s1: detecting the current (I) of each motor of the double motors of the electric vehicle;
s2: detecting a running distance (D) and a running speed (V) of the electric vehicle;
s3: the dual motors are judged to be in single motor operation if the judgment criteria are met,
wherein the criterion comprises a first criterion (C1): maximum current (I) of one of the two motors 1max ) Greater than the running current (I) o ) And the maximum current (I) of the other of the two motors 2max ) Less than the idle current (I) i )。
2. The method of claim 1, wherein,
the criterion further comprises a second criterion (C2): the running distance (D) of the electric vehicle is larger than the preset running distance (D) d ) And the speed (V) of the electric vehicle is greater than the preset speed (V) d )，
Wherein the dual motor is determined to be in single motor operation if the first criterion (C1) and the second criterion (C2) are simultaneously satisfied.
3. The method according to claim 1 or 2, wherein the method further comprises the steps of:
s4: calculating the distance traveled by the single motor (D) o ) The single-motor running distance is defined as the running distance of the double motors during the single-motor running period; and/or
Calculating the single motor running time (t) o ) The one-motor travel time is defined as the travel time during which the dual motors are in one-motor operation.
4. The method of claim 3, wherein the method further comprises the steps of:
s5: calculating a single-motor drive ratio (P) o ) The one-motor running occupancy is defined as the one-motor running distance (D) o ) Distance to total travel (D) t ) And/or the single-motor travel time (t) o ) And total travel time (t) t ) The percentage of (c) is determined by the percentage of (c),
wherein when the single motor drive duty (P) is greater o ) Greater than a predetermined percentage (P) d ) And judging that the double motors have single motor faults.
5. Method according to claim 2, wherein the total distance traveled (D) is recorded if a second criterion (C2) is fulfilled t ) And/or total travel time (t) t )。
6. The method of claim 4, wherein the method further comprises the steps of:
s6: and giving a warning in case that the double motor is judged to have the single motor fault.
7. A fault diagnosis system (1) for dual-motor fault diagnosis of an electric vehicle for implementing the method according to any one of claims 1 to 6, the fault diagnosis system (1) comprising at least:
a current detection element (10) provided so as to be adapted to detect a current (I) of each of the two motors;
a speed sensor (20) arranged to be adapted to detect a speed (V) of the electric vehicle;
an evaluation device (30) is provided which is suitable for determining a single-motor operation and/or a single-motor malfunction of the double motor on the basis of the measured variables.
8. The fault diagnosis system (1) according to claim 7, wherein the fault diagnosis system (1) further comprises a reminder device (40) arranged to be adapted to display/report a single motor fault warning and/or to send fault information to an assistance facility.
9. A computer program product, such as a computer readable program carrier, having stored thereon computer program instructions, which, when executed by a processor, at least assist in carrying out the method according to any one of claims 1-6.
10. An electric vehicle comprising a fault diagnosis system (1) according to claim 7 or 8 or a computer program product according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310129088.6A CN115871466A (en) | 2023-02-08 | 2023-02-08 | Method and fault diagnosis system for double-motor fault diagnosis of electric vehicle |
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| CN202310129088.6A CN115871466A (en) | 2023-02-08 | 2023-02-08 | Method and fault diagnosis system for double-motor fault diagnosis of electric vehicle |
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| CN115871466A true CN115871466A (en) | 2023-03-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310496A (en) * | 2023-11-30 | 2023-12-29 | 杭州智仝科技有限公司 | Motor fault diagnosis method for distributed electric drive system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310496A (en) * | 2023-11-30 | 2023-12-29 | 杭州智仝科技有限公司 | Motor fault diagnosis method for distributed electric drive system |
| CN117310496B (en) * | 2023-11-30 | 2024-02-06 | 杭州智仝科技有限公司 | Motor fault diagnosis method for distributed electric drive system |
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