CN114857184B - Clutch control method, device and storage medium - Google Patents
Clutch control method, device and storage medium Download PDFInfo
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- CN114857184B CN114857184B CN202210431589.5A CN202210431589A CN114857184B CN 114857184 B CN114857184 B CN 114857184B CN 202210431589 A CN202210431589 A CN 202210431589A CN 114857184 B CN114857184 B CN 114857184B
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- oil filling
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000005540 biological transmission Effects 0.000 claims abstract description 43
- 230000008859 change Effects 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 238000004590 computer program Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000002123 temporal effect Effects 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 7
- 230000036461 convulsion Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 206010027336 Menstruation delayed Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/104—Clutch
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/11—Application
- F16D2500/1107—Vehicles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/304—Signal inputs from the clutch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/502—Relating the clutch
- F16D2500/50293—Reduction of vibrations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/502—Relating the clutch
- F16D2500/50296—Limit clutch wear
-
- 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
- Y02T10/62—Hybrid vehicles
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
Disclosed herein is a clutch control method including: monitoring the impact degree of an output shaft of a transmission in real time in an oil filling stage of a clutch, and if the impact degree is larger than a first impact degree threshold value, reducing a first oil filling time variation quantity on the current value of the oil filling time of the clutch; the method comprises the steps of monitoring the pressure value of an accumulator in real time in a torque phase stage of a clutch, and if the change rate of the pressure value of the accumulator is larger than a first pressure change rate threshold value, increasing a first pressure value change amount on the current value of the pressure value of a half-junction point of the clutch. The scheme can adaptively control the half-junction pressure and the oil filling time of the clutch, so that the transmission obtains better gear shifting quality, reduces the abrasion of the clutch and prolongs the service life.
Description
Technical Field
The embodiment of the application relates to the field of hybrid electric vehicles, in particular to a clutch control method, a clutch control device and a storage medium.
Background
The half-engagement point (half-contact point) and the oil filling time of the clutch are two important parameters in clutch control of a hydraulic system, the solenoid valve is controlled to rapidly reduce the idle stroke of the clutch at a preset oil filling time and pressure in the normal gear shifting process, and the solenoid valve stays at the half-engagement point to transmit the set half-engagement point torque, so that the torque request can be well responded in the torque interaction process. In the driving process, the oil filling time and the pressure of the half-combining point can change along with the change of temperature and service life, and inaccurate half-combining point and oil filling time can generate gear shifting impact in gear shifting so as to cause abrasion of a clutch and influence the service life of the transmission.
Disclosure of Invention
The embodiment of the application provides a clutch control method, which comprises the following steps:
monitoring the impact degree of an output shaft of a transmission in real time in an oil filling stage of a clutch, and if the impact degree is larger than a first impact degree threshold value, reducing a first oil filling time variation quantity on the current value of the oil filling time of the clutch;
the method comprises the steps of monitoring the pressure value of an accumulator in real time in a torque phase stage of a clutch, and if the change rate of the pressure value of the accumulator is larger than a first pressure change rate threshold value, increasing a first pressure value change amount on the current value of the pressure value of a half-junction point of the clutch.
The embodiment of the application provides a clutch control device, which comprises: the clutch control device comprises a memory and a processor, wherein the memory stores a computer program which realizes the steps of the clutch control method when being executed by the processor.
Embodiments of the present application provide a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the clutch control method described above.
According to the clutch control method, the impact degree of the output shaft of the transmission is monitored in real time in the oil filling stage of the clutch, and if the impact degree is larger than a first impact degree threshold value, the first oil filling time variation is reduced on the current value of the oil filling time of the clutch; the method comprises the steps of monitoring the pressure value of an accumulator in real time in a torque phase stage of a clutch, and if the change rate of the pressure value of the accumulator is larger than a first pressure change rate threshold value, increasing a first pressure value change amount on the current value of the pressure value of a half-junction point of the clutch. The clutch control method can adaptively control the half-junction pressure and the oil filling time of the clutch, so that the transmission obtains better gear shifting quality, slows down the abrasion of the clutch and prolongs the service life.
Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.
Drawings
The accompanying drawings are included to provide an understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the embodiments of the present application, and not constitute a limitation to the technical aspects of the present application.
FIG. 1 is a flow chart of a clutch control method according to an embodiment of the present application;
fig. 2 is a schematic diagram of a clutch control device according to an embodiment of the present application.
Detailed Description
The present application describes a number of embodiments, but the description is illustrative and not limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique inventive arrangement as defined in the appended claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive arrangements to form another unique inventive arrangement as defined in the appended claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.
Furthermore, 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 sequences of steps are possible as will be appreciated by those of ordinary skill in the art. Accordingly, the particular order of the steps set forth in the specification should not be construed as limitations on the claims below. Furthermore, 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.
As shown in fig. 1, an embodiment of the present application provides a clutch control method, including:
step S10, monitoring the impact degree of an output shaft of the transmission in real time in the oil filling stage of the clutch, and if the impact degree is larger than a first impact degree threshold value, reducing the first oil filling time variation quantity on the current value of the oil filling time of the clutch;
and step S20, monitoring the pressure value of the accumulator in real time in the torque phase stage of the clutch, and if the change rate of the pressure value of the accumulator is larger than a first pressure change rate threshold value, increasing the first pressure value change amount on the current value of the half-junction pressure value of the clutch.
According to the clutch control method provided by the embodiment, the impact degree of the output shaft of the transmission is monitored in real time in the oil filling stage of the clutch, and if the impact degree is larger than the first impact degree threshold value, the first oil filling time variation is reduced on the current value of the oil filling time of the clutch; the method comprises the steps of monitoring the pressure value of an accumulator in real time in a torque phase stage of a clutch, and if the change rate of the pressure value of the accumulator is larger than a first pressure change rate threshold value, increasing a first pressure value change amount on the current value of the pressure value of a half-junction point of the clutch. The clutch control method can adaptively control the half-junction pressure and the oil filling time of the clutch, so that the transmission obtains better gear shifting quality, slows down the abrasion of the clutch and prolongs the service life.
In some exemplary embodiments, an accumulator is located at the front end of the clutch for providing oil pressure to the clutch.
In some exemplary embodiments, the transmission includes: DHT (Dedicated Hybrid Transmissions, hybrid dedicated transmission).
In some exemplary embodiments, the degree of impact of the transmission output shaft is the second derivative of the rotational speed of the transmission output shaft.
In some exemplary embodiments, the method further comprises: monitoring the impact degree of an output shaft of the transmission in real time in a first period of a torque phase of the clutch, and if the impact degree is larger than a second impact degree threshold value, increasing a second pressure value variation amount on the current value of a half-junction pressure value of the clutch; monitoring the impact degree of the output shaft of the transmission in real time in a second period of the torque phase of the clutch, and if the impact degree is larger than a third impact degree threshold value, reducing the third pressure value variation on the current value of the half-junction pressure value of the clutch; wherein the first period is in the early phase of the torque phase and the second period is in the late phase of the torque phase, the first period being earlier than the second period with no temporal intersection therebetween.
In some exemplary embodiments, the early phase of the torque phase refers to the first 1% portion of the overall torque phase; r1 is more than or equal to 65 and less than or equal to 75.
In some exemplary embodiments, the late phase of the torque phase refers to the latter 2% portion of the entire torque phase; r2 is more than or equal to 25 and less than or equal to 35.
In some exemplary embodiments, the first period may be the full duration or a portion of the duration of the torque phase front period; the second period may be the full duration or a partial duration of the torque phase late period.
In some exemplary embodiments, the method further comprises: monitoring the actual rotational speed of the transmission input shaft in real time during the torque phase of the clutch; when the gear shifting type is power upshift, if the actual rotating speed of the transmission input shaft is larger than the theoretical input shaft rotating speed of the current gear and the difference value between the actual rotating speed and the theoretical input shaft rotating speed is larger than a first rotating speed threshold value, increasing a fourth pressure value change amount on the current value of the half-junction pressure value of the clutch; when the gear shifting type is a non-power gear shifting, if the actual rotating speed of the transmission input shaft is smaller than the theoretical input shaft rotating speed of the current gear and the difference value between the actual rotating speed and the theoretical input shaft is larger than a second rotating speed threshold value, increasing a fourth pressure value change amount on the current value of the half-junction pressure value of the clutch; the current gear is the gear before the gear shift is completed.
In some exemplary embodiments, the theoretical input shaft speed v1 of the current gear is determined from the output shaft speed v2 and the transmission gear ratio a: v1=v2×a. The transmission ratio is also referred to as a speed ratio, and refers to the ratio of the rotational speed of the input shaft to the rotational speed of the output shaft.
In some exemplary embodiments, the method further comprises: monitoring the actual rotation speed of the transmission input shaft in real time in a second period of the torque phase of the clutch, and if the absolute value of the difference between the actual rotation speed of the transmission input shaft and the theoretical input shaft rotation speed of the target gear is in a decreasing trend, reducing the fifth pressure value variation on the current value of the half-junction pressure value of the clutch; the target gear is a gear after gear shifting is completed; the second period is in a later phase of the torque phase.
In some exemplary embodiments, the method further comprises: and saving the half-junction pressure value of the clutch after the torque phase stage adjustment of the clutch for the next gear shifting operation.
In some exemplary embodiments, the method further comprises: monitoring the actual rotational speed of the transmission input shaft in real time during the torque phase of the clutch; when the gear shifting type is power upshift, if the actual rotation speed of the transmission input shaft is greater than the theoretical input shaft rotation speed of the current gear and the difference value between the actual rotation speed of the transmission input shaft and the theoretical input shaft rotation speed of the current gear is greater than a first rotation speed threshold value, adding a second oil filling time variable quantity to the current value of the oil filling time of the clutch for the next gear shifting operation; when the gear shifting type is the non-power gear shifting, if the actual rotating speed of the transmission input shaft is smaller than the theoretical input shaft rotating speed of the current gear and the difference value between the actual rotating speed of the transmission input shaft and the theoretical input shaft is larger than a second rotating speed threshold value, a second oil filling time change amount is increased on the current value of the oil filling time of the clutch for the next gear shifting operation.
In some exemplary embodiments, the method further comprises:
and in the torque phase stage of the clutch, if the change rate of the pressure value of the accumulator is larger than the first pressure change rate threshold value, adding a third oil charge time change amount to the current value of the oil charge time of the clutch for the next gear shifting operation.
In some exemplary embodiments, the method further comprises: and saving the oil filling time after the oil filling stage and/or torque phase stage of the clutch are adjusted for the next gear shifting operation.
In some exemplary embodiments, the first period and the second period may be set according to an empirical value.
In some exemplary embodiments, the first, second, third, fourth, and fifth pressure value variations may be set according to empirical values.
In some exemplary embodiments, the first pressure change rate threshold, the first jerk threshold, the second jerk threshold, the third jerk threshold, the first rotational speed threshold, and the second rotational speed threshold may be set according to empirical values.
As shown in fig. 2, an embodiment of the present disclosure provides a clutch control apparatus including: the clutch control device comprises a memory and a processor, wherein the memory stores a computer program which realizes the steps of the clutch control method when being executed by the processor.
The disclosed embodiments provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the clutch control method described above.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (10)
1. A clutch control method, comprising:
monitoring the impact degree of an output shaft of a transmission in real time in an oil filling stage of a clutch, and if the impact degree is larger than a first impact degree threshold value, reducing a first oil filling time variation quantity on the current value of the oil filling time of the clutch;
and monitoring the pressure value of the accumulator in real time in the torque phase stage of the clutch, if the change rate of the pressure value of the accumulator is larger than a first pressure change rate threshold value, increasing a first pressure value change amount on the current value of the pressure value of the half-junction point of the clutch, and increasing a third oil charge time change amount on the current value of the oil charge time of the clutch for the next gear shifting operation.
2. The method of claim 1, wherein the method further comprises:
monitoring the impact degree of an output shaft of the transmission in real time in a first period of a torque phase of the clutch, and if the impact degree is larger than a second impact degree threshold value, increasing a second pressure value variation amount on the current value of a half-junction pressure value of the clutch; monitoring the impact degree of the output shaft of the transmission in real time in a second period of the torque phase of the clutch, and if the impact degree is larger than a third impact degree threshold value, reducing the third pressure value variation on the current value of the half-junction pressure value of the clutch; wherein the first period is in the early phase of the torque phase and the second period is in the late phase of the torque phase, the first period being earlier than the second period with no temporal intersection therebetween.
3. The method of claim 1, wherein the method further comprises:
monitoring the actual rotational speed of the transmission input shaft in real time during the torque phase of the clutch; when the gear shifting type is power upshift, if the actual rotating speed of the transmission input shaft is larger than the theoretical input shaft rotating speed of the current gear and the difference value between the actual rotating speed and the theoretical input shaft rotating speed is larger than a first rotating speed threshold value, increasing a fourth pressure value change amount on the current value of the half-junction pressure value of the clutch; when the gear shifting type is a non-power gear shifting, if the actual rotating speed of the transmission input shaft is smaller than the theoretical input shaft rotating speed of the current gear and the difference value between the actual rotating speed and the theoretical input shaft is larger than a second rotating speed threshold value, increasing a fourth pressure value change amount on the current value of the half-junction pressure value of the clutch; the current gear is the gear before the gear shift is completed.
4. The method of claim 1, wherein the method further comprises:
monitoring the actual rotation speed of the transmission input shaft in real time in a second period of the torque phase of the clutch, and if the absolute value of the difference between the actual rotation speed of the transmission input shaft and the theoretical input shaft rotation speed of the target gear is in a decreasing trend, reducing the fifth pressure value variation on the current value of the half-junction pressure value of the clutch; the target gear is a gear after gear shifting is completed; the second period is in a later phase of the torque phase.
5. The method of claim 1, wherein the method further comprises:
monitoring the actual rotational speed of the transmission input shaft in real time during the torque phase of the clutch; when the gear shifting type is power upshift, if the actual rotation speed of the transmission input shaft is greater than the theoretical input shaft rotation speed of the current gear and the difference value between the actual rotation speed of the transmission input shaft and the theoretical input shaft rotation speed of the current gear is greater than a first rotation speed threshold value, adding a second oil filling time variable quantity to the current value of the oil filling time of the clutch for the next gear shifting operation; when the gear shifting type is the non-power gear shifting, if the actual rotating speed of the transmission input shaft is smaller than the theoretical input shaft rotating speed of the current gear and the difference value between the actual rotating speed of the transmission input shaft and the theoretical input shaft is larger than a second rotating speed threshold value, a second oil filling time change amount is increased on the current value of the oil filling time of the clutch for the next gear shifting operation.
6. The method of any one of claims 1-5, wherein the method further comprises: and saving the half-junction pressure value of the clutch after the torque phase stage adjustment of the clutch for the next gear shifting operation.
7. The method of any one of claims 1-5, wherein the method further comprises:
and saving the oil filling time after the oil filling stage and/or torque phase stage of the clutch are adjusted for the next gear shifting operation.
8. The method of any one of claims 1-5, wherein:
the transmission includes: hybrid dedicated transmission DHT.
9. A clutch control apparatus comprising: a memory and a processor, the memory storing a computer program which, when executed by the processor, performs the steps of the clutch control method of any one of the preceding claims 1-8.
10. A computer readable storage medium storing a computer program which when executed by a processor performs the steps of the clutch control method according to any one of the preceding claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210431589.5A CN114857184B (en) | 2022-04-22 | 2022-04-22 | Clutch control method, device and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210431589.5A CN114857184B (en) | 2022-04-22 | 2022-04-22 | Clutch control method, device and storage medium |
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| Publication Number | Publication Date |
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| CN114857184A CN114857184A (en) | 2022-08-05 |
| CN114857184B true CN114857184B (en) | 2024-03-08 |
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| CN113074194A (en) * | 2021-03-26 | 2021-07-06 | 湖南奕普汽车科技有限公司 | Automatic stepless transmission clutch oil filling and semi-linkage point self-learning method |
| CN113757357A (en) * | 2020-06-02 | 2021-12-07 | 广州汽车集团股份有限公司 | Oil filling and semi-joint point self-learning method for double-clutch automatic gearbox |
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| US6308125B1 (en) * | 2000-05-11 | 2001-10-23 | General Motors Corporation | Adaptive clutch control of a closed-throttle downshift |
| KR20030030198A (en) * | 2001-10-09 | 2003-04-18 | 현대자동차주식회사 | Method of learning an initial fill time at up - shift for an automatic transmission in vehicles |
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| CN114857184A (en) | 2022-08-05 |
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