CN114919412A - Method for judging empty suction fault of oil pump of electric automobile speed reducer - Google Patents
Method for judging empty suction fault of oil pump of electric automobile speed reducer Download PDFInfo
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- CN114919412A CN114919412A CN202210432264.9A CN202210432264A CN114919412A CN 114919412 A CN114919412 A CN 114919412A CN 202210432264 A CN202210432264 A CN 202210432264A CN 114919412 A CN114919412 A CN 114919412A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 230000010354 integration Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract description 141
- 230000001133 acceleration Effects 0.000 abstract description 5
- 238000009837 dry grinding Methods 0.000 abstract description 5
- 239000010687 lubricating oil Substances 0.000 abstract description 5
- 238000011217 control strategy Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a method for judging an oil pump suction failure of an electric automobile speed reducer. The method comprises the steps of obtaining a one-to-one correspondence relation of rotating speed, flow and current according to a technical specification of an oil pump, inputting the one-to-one correspondence relation into an oil pump control strategy, monitoring the current of the oil pump in real time, recording the duration when the current of the oil pump is lower than a given current threshold value at a certain rotating speed, triggering an oil pump suction fault when the accumulated time is larger than a set value within 1min continuously, and checking whether the lubricating oil quantity of a speed reducer is lost and whether an oil filter at the front end of the oil pump is blocked at the moment. The invention avoids the oil pump dry grinding damage caused by long-time air suction, and also avoids the frequent fault reporting caused by short air suction of the oil pump under the condition of rapid acceleration and deceleration of the vehicle.
Description
Technical Field
The invention belongs to the technical field of electric automobile fault judgment, and particularly relates to a method for judging an oil pump suction fault of an electric automobile speed reducer.
Background
If the electric automobile adopts an oil cold-electric driving system, an oil pump is integrated at the bottom of the speed reducer, the oil pump is a gear pump, the flow rate of the oil pump is in direct proportion to the rotating speed of the oil pump, and when the electric driving system needs cooling, the motor controller controls the rotating speed of the oil pump to control the flow rate of the oil pump, so that the cooling effect is achieved. When the oil quantity of the speed reducer is insufficient, the oil at the front end of the oil pump is filtered and blocked, the vehicle is accelerated and decelerated suddenly or goes up and down a slope to cause lubricating oil to be accumulated on one side and the like, the oil pump absorbs less oil or cannot absorb the oil, the oil pump is damaged by dry grinding due to long-time air suction, and the fault is frequently reported due to short-time air suction of the oil pump caused by the working condition of the vehicle under the condition of the sudden acceleration and deceleration.
Disclosure of Invention
In order to solve the problems of the oil pump of the reducer of the existing electric automobile oil-cold-electric driving system, the invention provides a method for judging the suction failure of the oil pump of the reducer of the electric automobile, which avoids the damage to the oil pump caused by dry grinding of the oil pump due to long-time suction and avoids frequent failure reporting caused by short suction of the oil pump due to the condition of rapid acceleration and deceleration of a vehicle.
The purpose of the invention is realized by the following technical scheme:
a method for judging the suction failure of an oil pump of an electric automobile speed reducer comprises the following steps:
s1, counting the one-to-one corresponding relation among current, oil pump rotating speed and oil pump flow under the normal working state of an oil pump;
under the normal operating condition, the motor controller controls the rotating speed of the oil pump through closed-loop control, and then controls the flow of the oil pump, and the current values of the oil pump corresponding to different rotating speeds are normal operating current, so that the one-to-one corresponding relation among the rotating speed of the oil pump, the flow of the oil pump and the current of the oil pump under the normal condition of the oil pump can be obtained according to the technical specification of the oil pump, and is shown in figure 1.
S2, counting the corresponding relation between the ratio of the actual current to the normal working current and the corresponding current threshold coefficient when the oil pump is in the air suction state;
s3, monitoring the rotation speed of the oil pump and the current of the oil pump in real time according to a certain time interval, calculating the ratio of the actual current of the oil pump to the normal working current, obtaining current threshold coefficients corresponding to the ratios according to the corresponding relation obtained in the step S2, and calculating equivalent air suction time; and judging whether the oil pump has suction failure or not through the equivalent suction time.
Further, in step S1, a one-to-one correspondence relationship among the oil pump rotation speed, the oil pump flow rate, and the oil pump current in the normal state of the oil pump is obtained according to the technical specification of the oil pump.
Further, in step S1, in the normal operation state, the motor controller controls the rotation speed of the oil pump through closed-loop control, so as to control the flow rate of the oil pump, and the current value of the oil pump corresponding to different rotation speeds is the normal operation current.
Further, in step S3, the method for calculating the equivalent air suction time includes: and multiplying the duration time of each ratio by a current threshold coefficient corresponding to the ratio, and integrating the obtained numerical value to obtain the equivalent air suction time.
Further, in step S3, the method for determining whether the oil pump has the suction failure or not through the equivalent suction time includes: and if the integration time is 1min and the equivalent air suction time is more than or equal to 30s, judging that the air suction fault of the oil pump occurs, and triggering the air suction fault alarm of the oil pump.
The invention has the beneficial effects that:
the invention provides a method for judging the suction failure of an oil pump of an electric automobile speed reducer, which avoids the damage to the oil pump caused by dry grinding of the oil pump due to long-time suction and avoids frequent failure reporting caused by short suction of the oil pump when the vehicle is in a rapid acceleration and deceleration working condition.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a one-to-one correspondence relationship between current, oil pump rotation speed and flow in a normal working state of an oil pump in a method for determining an oil pump suction failure of an electric vehicle reducer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a current threshold coefficient corresponding to an oil pump suction failure in the method for determining the oil pump suction failure of the electric vehicle speed reducer according to the embodiment of the invention.
FIG. 3 shows the actual current, normal operating current and the ratio of the actual current and the normal operating current of the oil pump within 1 min.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
The design idea of the invention is as follows:
the oil pump is usually supplied with power by a vehicle-mounted storage battery, the working voltage is approximately constant, so that under the normal working condition, the current of the oil pump, the rotating speed of the oil pump and the flow rate are in one-to-one correspondence, and when the oil pump is empty-sucked, the oil suction resistance of the oil pump is reduced, so that the current of the oil pump is lower than the normal working current. The method comprises the steps of obtaining a one-to-one correspondence relation among rotating speed, flow and current according to the technical specification of an oil pump, inputting the one-to-one correspondence relation into an oil pump control strategy, monitoring the current of the oil pump in real time, recording duration time when the current of the oil pump is lower than a given current threshold value at a certain rotating speed, triggering an oil pump suction fault when the accumulated time is greater than a set value within 1min continuously, and checking whether the lubricating oil quantity of a speed reducer is deficient and whether an oil filter at the front end of the oil pump is blocked at the moment.
The technical scheme of the invention is as follows:
a method for judging the suction failure of an oil pump of an electric automobile speed reducer comprises the following steps:
s1, counting the one-to-one corresponding relation among current, oil pump rotating speed and oil pump flow under the normal working state of an oil pump;
under the normal operating condition, the motor controller controls the rotating speed of the oil pump through closed-loop control, so as to control the flow of the oil pump, and the current values of the oil pump corresponding to different rotating speeds are normal operating currents, so that the one-to-one corresponding relation among the rotating speed of the oil pump, the flow of the oil pump and the current of the oil pump under the normal condition of the oil pump can be obtained according to the technical specification of the oil pump, as shown in fig. 1.
S2, counting the corresponding relation between the ratio of actual current to normal working current and a corresponding current threshold coefficient when the oil pump is empty;
s3, monitoring the rotation speed of the oil pump and the current of the oil pump in real time according to a certain time interval, calculating the ratio of the actual current of the oil pump to the normal working current, acquiring current threshold coefficients corresponding to the ratios according to the corresponding relation obtained in the step S2, and calculating equivalent air suction time; and judging whether the oil pump has suction failure or not through the equivalent suction time.
Further, in step S1, a one-to-one correspondence relationship among the oil pump rotation speed, the oil pump flow rate, and the oil pump current in the normal state of the oil pump is obtained according to the technical specification of the oil pump.
Further, in step S1, in the normal operation state, the motor controller controls the rotation speed of the oil pump through closed-loop control, so as to control the flow rate of the oil pump, and the current value of the oil pump corresponding to different rotation speeds is the normal operation current.
Further, in step S3, the method for calculating the equivalent air suction time includes: and multiplying the duration time of each ratio by a current threshold coefficient corresponding to the ratio, and integrating the obtained numerical value to obtain the equivalent air suction time.
Further, in step S3, the method for determining whether the oil pump has the suction failure or not through the equivalent suction time includes: and if the integration time is 1min and the equivalent air suction time is more than or equal to 30s, judging that the air suction fault of the oil pump occurs, and triggering the air suction fault alarm of the oil pump.
The embodiment is as follows:
a method for judging the suction failure of an oil pump of an electric automobile speed reducer comprises the following steps:
step one, programming the one-to-one correspondence relationship among current, oil pump rotating speed and oil pump flow under the normal working state of an oil pump into a motor controller:
under the normal operating condition, the motor controller controls the rotating speed of the oil pump through closed-loop control, so as to control the flow of the oil pump, and the current values of the oil pump corresponding to different rotating speeds are normal operating currents, so that the one-to-one corresponding relation among the rotating speed of the oil pump, the flow of the oil pump and the current of the oil pump under the normal condition of the oil pump can be obtained according to the technical specification of the oil pump, as shown in fig. 1.
And step two, acquiring the corresponding relation between the ratio of the actual current to the normal working current and the corresponding current threshold coefficient when the oil pump is in idle suction, as shown in fig. 2, and programming the corresponding relation between the ratio of the actual current to the normal working current and the corresponding current threshold coefficient into the motor controller.
Step three, monitoring the rotation speed of the oil pump and the current of the oil pump in real time according to the time interval of 0.1s, calculating the ratio of the actual current of the oil pump to the normal working current, obtaining a current threshold coefficient corresponding to the ratio according to the corresponding relation obtained in the step two, multiplying the duration of each ratio by the current threshold coefficient corresponding to the ratio, and integrating the obtained values to obtain the equivalent empty suction time; if the integration time is 1min and the equivalent air suction time is more than or equal to 30s, triggering the air suction fault alarm of the oil pump, and checking whether the lubricating oil quantity of the speed reducer is missing or the oil filter is blocked at the moment.
As shown in fig. 3, in the present embodiment, the relationship between the actual current of the oil pump and the normal operating current and the ratio between the actual current and the normal operating current, which are monitored by the oil pump within 1min, are shown by referring to the corresponding coefficients of fig. 2:
the time with the ratio of 1 is 22s, and the coefficient is 0;
the time with the ratio of 0.8 is 6s, and the coefficient is 0.25;
the time for the ratio 0.7 was 12s, and the coefficient was 0.5
The time with the ratio of 0.6 is 10s, and the coefficient is 0.75;
the time with the ratio of 0.5 is 10s, and the coefficient is 1;
equivalent air suction time: 22 × 0+6 × 0.25+12 × 0.5+10 × 0.75+10 × 1 ═ 25s < 30s,
therefore, it can be concluded that although the oil pump has the suction phenomenon within 1min, the equivalent suction time is less than 30s, which may be that the oil pump cannot suck oil smoothly when the lubricating oil of the speed reducer is accumulated on the speed reducer due to the sudden acceleration and the sudden speed reducer of the vehicle, and the time is short and the oil pump can recover automatically, so that the suction fault of the oil pump should not be reported within the working condition of 1min according to the method introduced by the invention. If the integral summation value is larger than or equal to 30s, in order to avoid the oil pump from being damaged by long-term dry grinding, the air suction fault of the oil pump is reported, and whether the oil quantity of the speed reducer is lost or not and whether the oil filter is blocked or not are checked.
Although the preferred embodiments of the present invention have been described in detail, it should be understood that the scope of the present invention is not limited to the details of the embodiments, and that any simple modifications within the technical scope of the present invention and the technical solutions and inventive concepts of the present invention can be substituted or changed by equivalents and changes by those skilled in the art within the technical scope of the present invention.
It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (5)
1. The method for judging the suction failure of the oil pump of the reducer of the electric automobile is characterized by comprising the following steps of:
s1, counting the one-to-one corresponding relation among current, oil pump rotating speed and oil pump flow under the normal working state of an oil pump;
under the normal operating condition, the motor controller controls the rotating speed of the oil pump through closed-loop control, so as to control the flow of the oil pump, and the current values of the oil pump corresponding to different rotating speeds are normal operating currents, so that the one-to-one corresponding relation among the rotating speed of the oil pump, the flow of the oil pump and the current of the oil pump under the normal condition of the oil pump can be obtained according to the technical specification of the oil pump, as shown in fig. 1.
S2, counting the corresponding relation between the ratio of the actual current to the normal working current and the corresponding current threshold coefficient when the oil pump is in the air suction state;
s3, monitoring the rotation speed of the oil pump and the current of the oil pump in real time according to a certain time interval, calculating the ratio of the actual current of the oil pump to the normal working current, obtaining current threshold coefficients corresponding to the ratios according to the corresponding relation obtained in the step S2, and calculating equivalent air suction time; and judging whether the oil pump has suction failure or not through the equivalent suction time.
2. The method for determining the suction failure of the oil pump of the electric automobile speed reducer according to claim 1, wherein in step S1, a one-to-one correspondence relationship among the oil pump rotation speed, the oil pump flow rate, and the oil pump current in a normal state of the oil pump is obtained according to a technical specification of the oil pump.
3. The method for determining the suction failure of the oil pump of the electric automobile speed reducer according to claim 2, wherein in the step S1, in the normal operation state, the motor controller controls the rotation speed of the oil pump through closed-loop control, so as to control the flow rate of the oil pump, and the current values of the oil pump corresponding to different rotation speeds are normal operation currents.
4. The method for determining the suction failure of the oil pump of the electric automobile speed reducer according to claim 1, wherein in the step S3, the method for calculating the equivalent suction time comprises the following steps: and multiplying the duration time of each ratio by a current threshold coefficient corresponding to the ratio, and integrating the obtained numerical value to obtain the equivalent air suction time.
5. The method for determining the suction failure of the oil pump of the electric automobile speed reducer according to claim 4, wherein in the step S3, the method for determining whether the suction failure of the oil pump occurs or not through the equivalent suction time comprises the following steps: and if the integration time is 1min and the equivalent air suction time is more than or equal to 30s, judging that the air suction fault of the oil pump occurs, and triggering the air suction fault alarm of the oil pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210432264.9A CN114919412B (en) | 2022-04-22 | 2022-04-22 | Electric automobile speed reducer oil pump suction fault judging method |
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| CN202210432264.9A CN114919412B (en) | 2022-04-22 | 2022-04-22 | Electric automobile speed reducer oil pump suction fault judging method |
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| CN114919412B CN114919412B (en) | 2024-07-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09109877A (en) * | 1995-10-17 | 1997-04-28 | Aisin Seiki Co Ltd | Method for detecting motor failure of hydraulic pressure control device |
| CN102691649A (en) * | 2011-03-22 | 2012-09-26 | 日立汽车系统株式会社 | Apparatus for controlling electric oil pump |
| CN109072901A (en) * | 2016-04-25 | 2018-12-21 | 株式会社三国 | The light load abnormal determination method of electric oil pump |
| CN109725220A (en) * | 2019-01-02 | 2019-05-07 | 中车株洲电力机车有限公司 | A kind of detection method, system and the device in transformer oil cooling circuit |
| CN112433151A (en) * | 2019-08-26 | 2021-03-02 | 上海汽车集团股份有限公司 | Oil pump motor fault diagnosis method and device |
-
2022
- 2022-04-22 CN CN202210432264.9A patent/CN114919412B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09109877A (en) * | 1995-10-17 | 1997-04-28 | Aisin Seiki Co Ltd | Method for detecting motor failure of hydraulic pressure control device |
| CN102691649A (en) * | 2011-03-22 | 2012-09-26 | 日立汽车系统株式会社 | Apparatus for controlling electric oil pump |
| CN109072901A (en) * | 2016-04-25 | 2018-12-21 | 株式会社三国 | The light load abnormal determination method of electric oil pump |
| CN109725220A (en) * | 2019-01-02 | 2019-05-07 | 中车株洲电力机车有限公司 | A kind of detection method, system and the device in transformer oil cooling circuit |
| CN112433151A (en) * | 2019-08-26 | 2021-03-02 | 上海汽车集团股份有限公司 | Oil pump motor fault diagnosis method and device |
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| CN114919412B (en) | 2024-07-12 |
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Address after: 130012 no.4888, Yushan Road, Changchun high tech Development Zone, Jilin Province Patentee after: FAW Besturn Automotive Co.,Ltd. Country or region after: China Address before: 130000 No. 4888, Weishan Road, high tech Development Zone, Changchun City, Jilin Province Patentee before: FAW Pentium Car Co.,Ltd. Country or region before: China |