CN113819233A - Automatic transmission of vehicle, control method and device of transfer case - Google Patents
Automatic transmission of vehicle, control method and device of transfer case Download PDFInfo
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- CN113819233A CN113819233A CN202011409204.2A CN202011409204A CN113819233A CN 113819233 A CN113819233 A CN 113819233A CN 202011409204 A CN202011409204 A CN 202011409204A CN 113819233 A CN113819233 A CN 113819233A
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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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
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Abstract
The invention relates to the technical field of vehicle control, and provides a control method and a control device for an automatic gearbox and a transfer case of a vehicle. The vehicle having a transfer case cooperating with an automatic transmission including a first brake and a planetary gear mechanism, the first brake cooperating with an outer ring gear of the planetary gear mechanism to brake or release the outer ring gear, the method comprising: detecting a gear of an automatic gearbox; when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral, controlling a first brake to release the outer gear ring; when the first brake is detected to release the outer gear ring, a mode switching signal is sent so that the transfer case can be switched to a low-speed four-wheel drive mode; and controlling a first brake to brake the outer gear ring when the low-speed four-wheel drive mode switching completion signal is detected. The invention can reduce the clamping stagnation caused by switching the mode of the transfer case and give better experience to a driver.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a control method and a control device for an automatic gearbox and a transfer case of a vehicle.
Background
The main function of the transfer case is to distribute the power transmitted by the power to the front and rear transmission shafts, and the torque is transmitted to 4 wheels through the main reducing shaft and the driving shaft, thereby realizing four-wheel drive. The transfer generally includes a high-speed driving mode including a high-speed four-wheel drive mode (4WD mode), a high-speed two-wheel drive mode (2H mode), and a low-speed driving mode including a low-speed four-wheel drive mode (4L mode).
Limited by the mechanical structure of the automatic transmission, the automatic transmission generally has two brakes and also has a planetary gear mechanism including a sun gear, a planet carrier, an outer ring gear, and the like. When the transmission is in the N gear, the brake A can brake the sun gear, and the brake B can brake the outer gear ring, but even if no power is transmitted, when the engine runs, because drag torque exists between multi-plate clutches in the transmission (the drag torque refers to torque generated by fluid viscosity when the clutches are separated), torque can still be transmitted from the output shaft of the transmission. When the transfer case is in the 4L mode, the drag torque is even amplified by more than 2.4 times, which causes the jamming problem when the transfer case is switched in and out in the 4L mode.
Disclosure of Invention
In view of this, the present invention is directed to a method for controlling an automatic transmission of a vehicle, so as to reduce the jamming caused when a transfer gear switches modes, and provide better experience for a driver.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control method of an automatic transmission of a vehicle having a transfer case that is engaged with the automatic transmission, the automatic transmission including a first brake and a planetary gear mechanism, the first brake being engaged with an outer ring gear of the planetary gear mechanism to brake or release the outer ring gear, the method comprising: detecting a gear of the automatic gearbox; when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral, controlling the first brake to release the outer gear ring; when the first brake is detected to release the outer gear ring, sending a mode switching signal to enable the transfer case to carry out low-speed four-wheel drive mode switching; and when a low-speed four-wheel drive mode switching completion signal is detected, controlling the first brake to brake the outer gear ring.
Further, the method further comprises: and when a mode switching signal is sent, controlling the gear of the automatic gearbox to keep the neutral position unchanged.
Further, after the transmitting the mode switching signal, the method further includes: and when the low-speed four-wheel drive mode switching completion signal is detected and the gear of the automatic gearbox is not a neutral gear, controlling the first brake to brake the outer gear ring.
Further, the method further comprises: and when the low-speed four-wheel drive mode switching completion signal is not detected within the preset time, controlling a prompting device to prompt that the low-speed four-wheel drive mode switching fails.
Further, the method further comprises: and when the first brake is detected to fail to release the outer gear ring, controlling a prompt device to prompt that the low-speed four-wheel drive mode switching condition is not met.
Compared with the prior art, the control method of the automatic gearbox of the vehicle has the following advantages:
detecting a gear of the automatic gearbox; when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral, controlling the first brake to release the outer gear ring; when the first brake is detected to release the outer gear ring, sending a mode switching signal to enable the transfer case to carry out low-speed four-wheel drive mode switching; and when a low-speed four-wheel drive mode switching completion signal is detected, controlling the first brake to brake the outer gear ring. Through making the derailleur planet carrier be in free state, reduce and drag the torque output, can realize the mode switch of transfer case smoothly, give the driver better experience.
Another objective of the present invention is to provide a control method for a transfer case of a vehicle, so as to reduce the jamming caused when the transfer case switches modes, and give the driver a better experience.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control method of a transfer case of a vehicle having an automatic transmission that cooperates with the transfer case, the method comprising: detecting a low-speed four-wheel-drive mode switch signal; when the low-speed four-wheel drive mode switch signal is detected, sending a low-speed four-wheel drive mode switching request signal to release an outer gear ring of a planetary gear mechanism of the automatic gearbox; when a mode switching signal is received, switching a low-speed four-wheel drive mode; and when the completion of the low-speed four-wheel drive mode switching is detected, sending a low-speed four-wheel drive mode switching completion signal to brake an outer gear ring of a planetary gear mechanism of the automatic gearbox.
Compared with the prior art, the control method of the transfer case of the vehicle has the following advantages:
through cooperating with automatic gearbox, the transfer case switches when receiving the instruction that can carry out the mode switch again, because automatic gearbox's planetary gear mechanism's outer ring gear is at the adjustment before the transfer case mode switch, the jamming that causes when can reducing the transfer case mode switch gives the driver better experience.
Another object of the present invention is to provide a control device for an automatic transmission of a vehicle, which can reduce the jamming caused when a transfer gear is switched to a mode, and provide a better experience for a driver.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control apparatus of an automatic transmission of a vehicle having a transfer case that is engaged with the automatic transmission, the automatic transmission including a first brake and a planetary gear mechanism, the first brake being engaged with an outer ring gear of the planetary gear mechanism to brake or release the outer ring gear, the apparatus comprising: the automatic transmission control system comprises a first detection unit and a first control unit, wherein the first detection unit is used for detecting the gear of the automatic transmission; the first control unit is used for controlling the first brake to release the outer gear ring when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral; the first detection unit is used for sending a mode switching signal to enable the transfer case to switch the low-speed four-wheel drive mode when detecting that the first brake releases the outer gear ring, and the first control unit is used for controlling the first brake to brake the outer gear ring when detecting that the low-speed four-wheel drive mode switching completion signal.
Further, the first control unit is configured to: and when a mode switching signal is sent, controlling the gear of the automatic gearbox to keep the neutral position unchanged.
Further, after the mode switching signal is sent, the first control unit is configured to: and when the low-speed four-wheel drive mode switching completion signal is detected and the gear of the automatic gearbox is not a neutral gear, controlling the first brake to brake the outer gear ring.
Further, the first control unit is configured to: and when the low-speed four-wheel drive mode switching completion signal is not detected within the preset time, controlling a prompting device to prompt that the low-speed four-wheel drive mode switching fails.
Further, the first control unit is configured to: and when the first brake is detected to fail to release the outer gear ring, controlling a prompt device to prompt that the low-speed four-wheel drive mode switching condition is not met.
Compared with the prior art, the control device of the automatic gearbox of the vehicle and the control method of the automatic gearbox of the vehicle have the same advantages, and are not described again.
Another object of the present invention is to provide a control device for a transfer case of a vehicle, which can reduce the jamming caused when the transfer case switches modes and give a better experience to a driver.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control device of a transfer case of a vehicle having an automatic transmission that cooperates with the transfer case, the device comprising: the second detection unit is used for detecting a low-speed four-wheel-drive mode switch signal; the second control unit is configured to: when the low-speed four-wheel drive mode switch signal is detected, sending a low-speed four-wheel drive mode switching request signal to release an outer gear ring of a planetary gear mechanism of the automatic gearbox; when a mode switching signal is received, switching a low-speed four-wheel drive mode; and when the completion of the low-speed four-wheel drive mode switching is detected, sending a low-speed four-wheel drive mode switching completion signal to brake an outer gear ring of a planetary gear mechanism of the automatic gearbox.
Compared with the prior art, the control device of the vehicle transfer case has the same advantages as the control method of the vehicle transfer case, and the detailed description is omitted.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a control method of an automatic transmission of a vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an automatic transmission of a vehicle according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of an internal structure of an automatic transmission according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of a transfer case of a vehicle according to an embodiment of the present invention;
fig. 5 is a block diagram showing a configuration of a control apparatus of an automatic transmission for a vehicle according to an embodiment of the present invention;
fig. 6 is a block diagram showing a configuration of a control device of a transfer case of a vehicle according to an embodiment of the present invention.
Description of reference numerals:
1 first detection unit 2 first control unit
3 second detection unit 4 second control unit
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a flowchart of a control method of an automatic transmission of a vehicle according to an embodiment of the present invention. As shown in fig. 1, the vehicle has a transfer case that cooperates with the automatic transmission that includes a first brake and a planetary gear mechanism, the first brake cooperating with an outer ring gear of the planetary gear mechanism to brake or release the outer ring gear, the method including:
step S11, detecting the gear of the automatic gearbox;
for example, the switching of the low-speed four-wheel drive mode by the transfer gear in the invention refers to switching in or switching out the low-speed four-wheel drive mode by the transfer gear. In order for the transfer case to smoothly perform the low-speed four-wheel drive mode switching, the vehicle must satisfy that the automatic transmission gear is in neutral (N-speed). Therefore, it is necessary to detect the shift position of the automatic transmission.
Step S12, when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral, controlling the first brake to release the outer gear ring;
for example, since the first brake is engaged or disengaged to brake or release the outer ring gear, the outer ring gear serves as a driving member, and the carrier of the planetary gear mechanism serves as a driven member, when the low-speed four-wheel drive mode switching request signal is received and the gear position of the automatic transmission is neutral, the first brake is controlled to release the outer ring gear, so that the carrier is in a free state to reduce drag torque, and torque output by the output shaft of the automatic transmission can be reduced or even eliminated. The low-speed four-wheel drive mode switching request signal may be sent by a control device of the transfer case, and the control device of the transfer case may send the low-speed four-wheel drive mode switching request signal when receiving the low-speed four-wheel drive mode switching signal.
Step S13, when the first brake is detected to release the outer gear ring, a mode switching signal is sent to enable the transfer case to carry out low-speed four-wheel drive mode switching;
for example, when it is detected that the first brake releases the outer ring gear, a mode switching signal is sent to a control device of the transfer case to control the transfer case to switch the low-speed four-wheel drive mode, and at this time, because the drag torque is reduced, even if the drag torque is amplified in the low-speed four-wheel drive mode, the torque output by the output shaft of the automatic transmission is greatly reduced, so that the jamming caused when the mode is switched by the transfer case is reduced.
And step S14, controlling the first brake to brake the outer gear ring when the low-speed four-wheel drive mode switching completion signal is detected.
For example, when the low-speed four-wheel drive mode switching completion signal of the control device of the transfer case is detected, which indicates that the low-speed four-wheel drive mode switching is completed, the first brake can be controlled to brake the outer ring gear again to complete the mode switching process of the transfer case.
Fig. 2 is a flowchart of a control method of an automatic transmission of a vehicle according to another embodiment of the present invention. As shown in fig. 2, the method includes:
step S21, detecting the gear of the automatic gearbox;
step S22, judging whether a low-speed four-wheel drive mode switching request signal is received or not, wherein the gear of the automatic gearbox is neutral;
step S23, when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral, controlling the first brake to release the outer gear ring;
and step S24, when the low-speed four-wheel drive mode switching request signal is not received or the gear of the automatic gearbox is not neutral, normally controlling.
For example, if a low-speed four-wheel drive mode switching request signal is not received, or the shift position of the automatic transmission is not neutral, the low-speed four-wheel drive mode switching of the transfer case cannot be performed, and therefore only the control of the transfer case needs to be performed normally.
Step S25, detecting whether the first brake releases the external gear ring;
step S26, when the first brake is detected to release the outer gear ring, a mode switching signal is sent to enable the transfer case to carry out low-speed four-wheel drive mode switching, and the gear of the automatic gearbox is controlled to keep a neutral position unchanged;
and step S27, when the first brake is detected to fail to release the outer gear ring, controlling a prompting device to prompt that the switching condition of the low-speed four-wheel drive mode is not met.
For example, when a mode switching signal is sent to a control device of the transfer case, so that the transfer case performs low-speed four-wheel drive mode switching, the gear of the automatic gearbox can be controlled to keep neutral, and thus the automatic gearbox can be locked at N gear in the mode switching process of the transfer case, and gear beating of a sliding sleeve of the transfer case caused by misoperation can be effectively prevented. If the first brake is detected to fail to release the outer gear ring, the mode switching signal is not sent, but the prompting device can prompt that the low-speed four-wheel drive mode switching condition is not met, for example, a meter or other display device prompts that the mode switching condition is not met and retry is required, and of course, the prompting device can also be a prompting device such as sound and light to prompt the user by sound and light.
Step S28, judging whether a low-speed four-wheel drive mode switching completion signal is detected within a preset time;
step S29, when detecting the low-speed four-wheel drive mode switching completion signal, detecting whether the gear of the automatic gearbox is not neutral;
and step S210, controlling the first brake to brake the outer gear ring when the gear of the automatic gearbox is not detected to be neutral.
It is also possible to detect whether the gear of the automatic gearbox is not neutral, for example, before controlling the first brake to brake the outer ring gear. If the gear of the automatic transmission is neutral, the first brake may not be controlled to brake the outer ring gear; the first brake is controlled to brake the outer ring gear when the gear position of the automatic transmission is not neutral, such as D-position or R-position. Therefore, the timing of combining the first brake (braking the outer gear ring) can be set to be in the D/R gear, and the impact when the first brake is combined is weakened.
Step S211, when the low-speed four-wheel drive mode switching completion signal is not detected within the preset time, controlling the prompting device to prompt that the low-speed four-wheel drive mode switching fails.
For example, if the low-speed four-wheel drive mode switching completion signal is not detected within the preset time, a failure of low-speed four-wheel drive mode switching may be prompted by a prompting device, for example, a meter or other display device prompts "failure of low-speed four-wheel drive mode switching, please retry", and of course, the prompting device may also be a prompting device such as sound, light, and the like to perform sound and light prompting.
Fig. 3 is a schematic structural diagram of an automatic transmission according to an embodiment of the present invention. As shown in fig. 3, B is the first brake, and P1-P4 are planetary gear mechanisms, and when the first brake B is opened, the outer ring gear of the planetary gear mechanism can be released, so that the torque output by the automatic transmission can be reduced as described above.
Fig. 4 is a flowchart of a control method of a transfer case of a vehicle according to an embodiment of the present invention. As shown in fig. 4, the vehicle has an automatic transmission engaged with the transfer case, and the method includes:
step S41, detecting a low-speed four-wheel drive mode switch signal;
for example, the low-speed four-wheel-drive mode switch signal can be generated by a user operating a key, a dial or a rocker.
Step S42, when the low-speed four-wheel drive mode switch signal is detected, sending a low-speed four-wheel drive mode switching request signal to release an outer gear ring of a planetary gear mechanism of the automatic gearbox;
for example, upon detection of the low-speed four-wheel drive mode switch signal, the control device of the transfer case does not directly control the transfer case low-speed four-wheel drive mode switching, but sends a low-speed four-wheel drive mode switching request signal to the control device of the automatic transmission, so that the release of the outer ring gear of the planetary gear mechanism of the automatic transmission can be controlled.
Step S43, when receiving the mode switching signal, switching the low-speed four-wheel drive mode;
for example, a control device of an automatic transmission sends a mode switching signal after an outer ring gear of a planetary gear mechanism of the automatic transmission is released. The control device of the transfer case receives the mode switching signal at this time, and then controls the transfer case to switch the low-speed four-wheel drive mode.
And step S44, when the completion of the low-speed four-wheel drive mode switching is detected, sending a low-speed four-wheel drive mode switching completion signal to brake an outer gear ring of a planetary gear mechanism of the automatic gearbox.
For example, when the control device of the transfer case detects that the low-speed four-wheel drive mode switching is completed, it sends a low-speed four-wheel drive mode switching completion signal to the control device of the automatic transmission, so that the outer ring gear of the planetary gear mechanism of the automatic transmission can be controlled to brake.
Fig. 5 is a block diagram showing a configuration of a control device for an automatic transmission of a vehicle according to an embodiment of the present invention. As shown in fig. 5, the vehicle has a transfer case that cooperates with the automatic transmission including a first brake and a planetary gear mechanism, the first brake cooperating with an outer ring gear of the planetary gear mechanism to brake or release the outer ring gear, the apparatus comprising: the automatic transmission control system comprises a first detection unit 1 and a first control unit 2, wherein the first detection unit 1 is used for detecting the gear of the automatic transmission; the first control unit 2 is used for controlling the first brake to release the outer gear ring when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral; the first detection unit 1 is used for sending a mode switching signal to enable the transfer case to perform low-speed four-wheel drive mode switching when the first brake is detected to release the outer gear ring; the first control unit 2 is used for controlling the first brake to brake the outer gear ring when detecting a low-speed four-wheel drive mode switching completion signal.
Further, the first control unit 2 is configured to: and when a mode switching signal is sent, controlling the gear of the automatic gearbox to keep the neutral position unchanged.
Further, after sending the mode switching signal, the first control unit 2 is configured to: and when the low-speed four-wheel drive mode switching completion signal is detected and the gear of the automatic gearbox is not a neutral gear, controlling the first brake to brake the outer gear ring.
Further, the first control unit 2 is configured to: and when the low-speed four-wheel drive mode switching completion signal is not detected within the preset time, controlling a prompting device to prompt that the low-speed four-wheel drive mode switching fails.
Further, the first control unit 2 is configured to: and when the first brake is detected to fail to release the outer gear ring, controlling a prompt device to prompt that the low-speed four-wheel drive mode switching condition is not met.
The embodiment of the control apparatus for an automatic transmission of a vehicle described above is similar to the embodiment of the control method for an automatic transmission of a vehicle described above, and will not be described again here.
Fig. 6 is a block diagram showing a configuration of a control device of a transfer case of a vehicle according to an embodiment of the present invention. As shown in fig. 6, the vehicle has an automatic transmission engaged with the transfer case, and the apparatus includes: the second detection unit 3 and the second control unit 4, wherein the second detection unit 3 is used for detecting a low-speed four-wheel drive mode switch signal; the second control unit 4 is configured to: when the low-speed four-wheel drive mode switch signal is detected, sending a low-speed four-wheel drive mode switching request signal to release an outer gear ring of a planetary gear mechanism of the automatic gearbox; when a mode switching signal is received, switching a low-speed four-wheel drive mode; and when the completion of the low-speed four-wheel drive mode switching is detected, sending a low-speed four-wheel drive mode switching completion signal to brake an outer gear ring of a planetary gear mechanism of the automatic gearbox.
The embodiment of the control apparatus of a transfer case of a vehicle described above is similar to the embodiment of the control method of a transfer case of a vehicle described above, and is not described again here.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (12)
1. A control method of an automatic transmission of a vehicle having a transfer case that is engaged with the automatic transmission, characterized in that the automatic transmission includes a first brake and a planetary gear mechanism, the first brake being engaged with an outer ring gear of the planetary gear mechanism to brake or release the outer ring gear, the method comprising:
detecting a gear of the automatic gearbox;
when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral, controlling the first brake to release the outer gear ring;
when the first brake is detected to release the outer gear ring, sending a mode switching signal to enable the transfer case to carry out low-speed four-wheel drive mode switching;
and when a low-speed four-wheel drive mode switching completion signal is detected, controlling the first brake to brake the outer gear ring.
2. The control method of an automatic transmission of a vehicle according to claim 1, characterized by further comprising:
and when a mode switching signal is sent, controlling the gear of the automatic gearbox to keep the neutral position unchanged.
3. The control method of an automatic transmission of a vehicle according to claim 1, characterized in that after the mode switching signal is transmitted, the method further comprises:
and when the low-speed four-wheel drive mode switching completion signal is detected and the gear of the automatic gearbox is not a neutral gear, controlling the first brake to brake the outer gear ring.
4. The control method of an automatic transmission of a vehicle according to claim 1, characterized by further comprising:
and when the low-speed four-wheel drive mode switching completion signal is not detected within the preset time, controlling a prompting device to prompt that the low-speed four-wheel drive mode switching fails.
5. The control method of an automatic transmission of a vehicle according to claim 1, characterized by further comprising:
and when the first brake is detected to fail to release the outer gear ring, controlling a prompt device to prompt that the low-speed four-wheel drive mode switching condition is not met.
6. A control method of a transfer case of a vehicle having an automatic transmission that is engaged with the transfer case, characterized by comprising:
detecting a low-speed four-wheel-drive mode switch signal;
when the low-speed four-wheel drive mode switch signal is detected, sending a low-speed four-wheel drive mode switching request signal to release an outer gear ring of a planetary gear mechanism of the automatic gearbox;
when a mode switching signal is received, switching a low-speed four-wheel drive mode;
and when the completion of the low-speed four-wheel drive mode switching is detected, sending a low-speed four-wheel drive mode switching completion signal to brake an outer gear ring of a planetary gear mechanism of the automatic gearbox.
7. A control apparatus of an automatic transmission of a vehicle having a transfer case that is engaged with the automatic transmission, the automatic transmission including a first brake and a planetary gear mechanism, the first brake being engaged with an outer ring gear of the planetary gear mechanism to brake or release the outer ring gear, the apparatus comprising:
a first detection unit and a first control unit, wherein,
the first detection unit is used for detecting the gear of the automatic gearbox;
the first control unit is used for controlling the first brake to release the outer gear ring when a low-speed four-wheel drive mode switching request signal is received and the gear of the automatic gearbox is neutral;
the first detection unit is used for sending a mode switching signal when detecting that the first brake releases the outer gear ring, so that the transfer case is switched into a low-speed four-wheel drive mode;
the first control unit is used for controlling the first brake to brake the outer gear ring when detecting a low-speed four-wheel drive mode switching completion signal.
8. The control apparatus of an automatic transmission of a vehicle according to claim 7, characterized in that the first control unit is configured to:
and when a mode switching signal is sent, controlling the gear of the automatic gearbox to keep the neutral position unchanged.
9. The control device of an automatic transmission of a vehicle according to claim 7, characterized in that, after the mode switching signal is sent, the first control unit is configured to:
and when the low-speed four-wheel drive mode switching completion signal is detected and the gear of the automatic gearbox is not a neutral gear, controlling the first brake to brake the outer gear ring.
10. The control apparatus of an automatic transmission of a vehicle according to claim 7, characterized in that the first control unit is configured to:
and when the low-speed four-wheel drive mode switching completion signal is not detected within the preset time, controlling a prompting device to prompt that the low-speed four-wheel drive mode switching fails.
11. The control apparatus of an automatic transmission of a vehicle according to claim 7, characterized in that the first control unit is configured to:
and when the first brake is detected to fail to release the outer gear ring, controlling a prompt device to prompt that the low-speed four-wheel drive mode switching condition is not met.
12. A control device of a transfer case of a vehicle having an automatic transmission engaged with the transfer case, characterized by comprising:
a second detection unit and a second control unit, wherein,
the second detection unit is used for detecting a low-speed four-wheel-drive mode switch signal;
the second control unit is configured to:
when the low-speed four-wheel drive mode switch signal is detected, sending a low-speed four-wheel drive mode switching request signal to release an outer gear ring of a planetary gear mechanism of the automatic gearbox;
when a mode switching signal is received, switching a low-speed four-wheel drive mode;
and when the completion of the low-speed four-wheel drive mode switching is detected, sending a low-speed four-wheel drive mode switching completion signal to brake an outer gear ring of a planetary gear mechanism of the automatic gearbox.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011409204.2A CN113819233A (en) | 2020-12-03 | 2020-12-03 | Automatic transmission of vehicle, control method and device of transfer case |
| PCT/CN2021/134999 WO2022117029A1 (en) | 2020-12-03 | 2021-12-02 | Control method and apparatus for automatic gearbox and transfer case of vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011409204.2A CN113819233A (en) | 2020-12-03 | 2020-12-03 | Automatic transmission of vehicle, control method and device of transfer case |
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| CN113819233A true CN113819233A (en) | 2021-12-21 |
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| CN202011409204.2A Pending CN113819233A (en) | 2020-12-03 | 2020-12-03 | Automatic transmission of vehicle, control method and device of transfer case |
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| CN (1) | CN113819233A (en) |
| WO (1) | WO2022117029A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025703A (en) * | 2023-03-15 | 2023-04-28 | 长城汽车股份有限公司 | Mode switching method and system of transfer case and vehicle |
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| US20050101431A1 (en) * | 2003-11-12 | 2005-05-12 | Timothy Allen | Multiple speed transfer case |
| CN105370876B (en) * | 2015-11-10 | 2018-08-28 | 中国北方车辆研究所 | Vehicle AMT gear-shifting control methods with high speed low speed 4 wheel driven function |
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| US20100138120A1 (en) * | 2007-03-30 | 2010-06-03 | Kefico Corporation | Shift control method for automatic transmission in four-wheel drive vehicle |
| CN104235339A (en) * | 2013-06-11 | 2014-12-24 | 本田技研工业株式会社 | Automatic transmission controller |
| CN104309477A (en) * | 2014-09-28 | 2015-01-28 | 长城汽车股份有限公司 | Transfer case, power transmission system and vehicle |
| CN106402371A (en) * | 2015-07-28 | 2017-02-15 | 长城汽车股份有限公司 | Mode switching control method, device and system of transfer case |
| CN107867293A (en) * | 2016-09-23 | 2018-04-03 | 丰田自动车株式会社 | Control device and control method for four-wheel drive vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116025703A (en) * | 2023-03-15 | 2023-04-28 | 长城汽车股份有限公司 | Mode switching method and system of transfer case and vehicle |
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| WO2022117029A1 (en) | 2022-06-09 |
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