CN114562557A - Transfer case mode switching control method and system - Google Patents
Transfer case mode switching control method and system Download PDFInfo
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- CN114562557A CN114562557A CN202110231879.0A CN202110231879A CN114562557A CN 114562557 A CN114562557 A CN 114562557A CN 202110231879 A CN202110231879 A CN 202110231879A CN 114562557 A CN114562557 A CN 114562557A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 98
- 230000007935 neutral effect Effects 0.000 claims abstract description 7
- 238000011217 control strategy Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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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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- 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
- F16H61/04—Smoothing ratio shift
- F16H61/0437—Smoothing ratio shift by using electrical signals
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Abstract
The invention provides a method and a system for controlling mode switching of a transfer case, wherein a control side of the method comprises the steps of obtaining a control signal, judging whether the control signal simultaneously meets conditions, and locking a transmission at an N gear and keeping the transfer case in a neutral position when the control signal simultaneously meets the conditions; correspondingly adjusting the rotating speed of the output shaft of the transmission according to the type of the 4L mode switching signal, judging whether the rotating speed of the output shaft of the transmission after adjustment and the rotating speed of the output shaft of the transfer case meet a preset proportion threshold value or not, and switching the 4L mode of the transfer case when the preset proportion threshold value is met; and judging whether the mode of the transfer case 4L is successfully switched, and releasing the N gear lock of the transmission when the mode is successfully switched so as to enable the transmission to enter a proper gear. The invention can switch the 4L mode of the transfer case without stopping the vehicle, and can improve the driving pleasure.
Description
Technical Field
The invention relates to the technical field of automatic transmission automobiles, in particular to a mode switching control method of a transfer case. Meanwhile, the invention also relates to a transfer case mode switching control system based on the control method.
Background
The transfer case is an important component of an automobile power system, and mainly has the functions of distributing power transmitted by a transmission to a front transmission shaft and a rear transmission shaft and transmitting torque to 4 wheels through a main reducing shaft and a driving shaft so as to realize four-wheel drive. The working modes of the transfer case generally include a high-speed driving mode (4 WD mode for short) and a low-speed driving mode (2H mode for short), the high-speed driving mode generally includes a four-wheel drive mode (4 WD mode for short) and a high-speed two-wheel drive mode (4L mode for short), and the low-speed driving mode includes a low-speed four-wheel drive mode (4L mode for short) and an N gear, namely, the input shaft and the output shaft of the transfer case are disconnected.
And under the high-speed mode of the transfer case, the torque from the gearbox is transmitted to the input shaft of the transfer case, the high-low gear combination sleeve and the rear output shaft. The torque from the gearbox in the 4L mode is transmitted to the transfer case input shaft, the sun gear, the planet carrier, the high-low gear combination sleeve and the rear output shaft, and the torque is amplified. When the transfer case is in the 4L mode, the transfer case generally amplifies the output torque of the transmission by more than 2.5 times, so that the front axle and the rear axle obtain larger input torque, the dynamic performance of the vehicle is improved, and the non-paved road and the road with complex terrain can be faced easily. When the vehicle runs under a relatively smooth road condition, the transfer case can be in a high-speed driving mode, so that the vehicle has better fuel economy. Therefore, by switching the transfer case mode, the dynamic property and the fuel economy of the vehicle under different road conditions can be improved.
At present, the engagement and disengagement of the 4L mode of the transfer case are mainly realized by a planetary gear train, a coupling sleeve and a gear shifting motor. Also, when the transfer performs 4L mode switching, that is, the transfer is engaged or disengaged in the 4L mode to switch between the 4L mode and the non-4L mode, in order for the transfer to smoothly perform 4L mode switching, the vehicle must satisfy the condition that the transmission gear is in the N range (neutral) and the vehicle speed is 0. In this case, since the vehicle speed is 0 due to the need to stop the vehicle at the time of switching, there is a certain switching waiting time, and the vehicle lacks the driving pleasure.
Disclosure of Invention
In view of the above, the present invention is directed to a transfer case mode switching control method, so as to overcome the defect that the conventional transfer case 4L mode switching causes the lack of the driving pleasure of the vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a transfer case mode switching control method comprising:
acquiring control signals, wherein the control signals comprise a transfer case mode switching signal, a transmission gear signal and a vehicle speed signal;
judging whether the control signals simultaneously satisfy: requesting the transfer case to perform 4L mode switching, enabling the transmission gear to be in an N gear, and enabling the vehicle speed to be lower than a preset speed threshold;
when the control signals simultaneously meet all conditions, the transmission is locked at an N gear, and the transfer case is in a neutral position;
correspondingly adjusting the rotating speed of the output shaft of the transmission according to the type of the 4L mode switching signal, judging whether the rotating speed of the output shaft of the transmission after adjustment and the rotating speed of the output shaft of the transfer case meet a preset proportion threshold value, and switching the 4L mode of the transfer case when the preset proportion threshold value is met;
and judging whether the mode of the transfer case 4L is successfully switched, and releasing the N gear lock of the transmission when the mode is successfully switched so as to enable the transmission to enter a proper gear.
Further, the control signal further includes a gradient signal, and the condition that the control signal simultaneously satisfies includes: requesting the transfer case to perform 4L mode switching, enabling the transmission gear to be in an N gear, enabling the vehicle speed to be lower than a preset speed threshold value and enabling the gradient signal to be lower than a preset gradient threshold value.
Further, the preset gradient threshold value is 10%.
Further, when the control signals do not simultaneously meet all conditions, condition information needing to be met is prompted through a vehicle instrument.
Further, the 4L mode switching signal types include 4L mode engagement and 4L mode exit, and when the 4L mode is engaged, the internal clutch of the transmission is controlled to increase the rotation speed of the output shaft of the transmission, and when the 4L mode exits, the internal clutch of the transmission is controlled to decrease the rotation speed of the output shaft of the transmission.
Further, whether the mode of the transfer case 4L is successfully switched is judged within a preset time threshold range, and a judgment result is prompted through a vehicle instrument.
Furthermore, when the mode of the transfer case 4L is successfully switched, a vehicle speed signal, a gear shifting device gear signal and a transfer case mode signal are obtained, and after the N gear locking of the transmission is released, the transmission enters a proper gear according to the Map.
Compared with the prior art, the invention has the following advantages:
according to the transfer case mode switching control method, the rotating speed of the output shaft of the transmission is adjusted according to the type of the 4L mode switching signal through the judgment of the vehicle speed, so that the rotating speed of the output shaft of the transmission and the rotating speed of the output shaft of the transfer case meet the preset proportion, the 4L mode of the transfer case can be switched in a driving state with the vehicle speed lower than the preset speed threshold, and the defect that the driving pleasure of a vehicle is lack due to the existing 4L mode switching of the transfer case can be overcome.
Another object of the present invention is to provide a transfer case mode switching control system, including:
a transfer mode switch manipulated to output a transfer mode switching signal;
the control unit is used for acquiring control signals, the control signals comprise a transfer case mode switching signal, a transmission gear signal and a vehicle speed signal, and the control unit executes the following control strategy according to the acquired control signals:
judging whether the control signals simultaneously satisfy: requesting the transfer case to perform 4L mode switching, enabling the transmission gear to be in an N gear, and enabling the vehicle speed to be lower than a preset speed threshold;
when the control signals simultaneously meet various conditions, the transmission is locked at an N gear, and the transfer case is in a neutral gear;
correspondingly adjusting the rotating speed of the output shaft of the transmission according to the type of the 4L mode switching signal, judging whether the rotating speed of the output shaft of the transmission after adjustment and the rotating speed of the output shaft of the transfer case meet a preset proportion threshold value, and switching the 4L mode of the transfer case when the preset proportion threshold value is met;
and judging whether the mode of the transfer case 4L is successfully switched, and releasing the N gear lock of the transmission when the mode is successfully switched so as to enable the transmission to enter a proper gear.
Further, the control signal further includes a gradient signal, and the condition that the control signal simultaneously satisfies includes: requesting the transfer case to perform 4L mode switching, enabling the transmission gear to be in an N gear, enabling the vehicle speed to be lower than a preset speed threshold value and enabling the gradient signal to be lower than a preset gradient threshold value.
Further, the control unit comprises a transfer case control module, an EMS, a vehicle body stabilizing system module and a transmission control module which are connected.
The transfer case mode switching control system can switch the 4L mode of the transfer case in a driving state that the speed is lower than the preset speed threshold value, can improve the driving pleasure and has good practicability.
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 schematic configuration diagram of a transfer case mode switching control system according to an embodiment of the present invention;
fig. 2 is a flowchart of transfer mode switching control according to an embodiment of the present invention;
description of reference numerals:
1. a transfer case mode switch; 2. a control unit; 201. a transfer case control module; 202. EMS; 203. A body stabilization system module; 204. a transmission control module; 3. vehicle instrument.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms such as "first", "second", etc. appear in the description of the present invention, they are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly limited otherwise, the terms "mounted," "connected," and "connecting" are to be construed broadly. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
The present embodiment relates to a transfer case mode switching control system which is used in an automatic transmission automobile and is combined with the configuration shown in fig. 1, and which includes a transfer case mode switch 1 and a control unit 2.
The transfer mode switch 1 is operated to output a transfer mode switching signal, which includes a transfer 4L mode switching signal to request to engage or disengage the 4L mode.
The control unit 2 is configured to obtain a control signal, where the control signal mainly includes the transfer case mode switching signal, a transmission gear signal, a vehicle speed signal, and the like, and meanwhile, the control unit 2 may also execute a corresponding control strategy according to the obtained control signal to implement control over transfer case mode switching, especially transfer case 4L mode switching.
Specifically, the transfer mode switch 1 of the present embodiment can be realized by using a control part for transfer mode selection in an existing automobile. As a preferred embodiment, it should be noted that the control signal required to be obtained in the present embodiment may further include a gradient signal in addition to the transfer gear mode shift signal, the transmission gear signal and the vehicle speed signal.
Meanwhile, the control unit 2 of the present embodiment includes a transfer case control module 201, an EMS (Engine Management System) 202, a body stabilization System module 203, and a transmission control module 204 connected to each other in the vehicle.
In the above configuration of the control unit 2, the transfer control module 201 is used to perform control of a transfer in the automobile, and the transfer control module 201 also interacts with the EMS202, the body stability system module 203, and the transmission control module 204 to transmit a 4L switching request signal and the like. The EMS202 may be used to adjust the engine output speed, the body stability system 203 may be used to obtain vehicle speed and grade signals, and the transmission control module 204 may be used to control a transmission in the vehicle based on the received signals.
In a car, the transfer mode switch 1 CAN be connected to the Control unit 2 through a LIN line, a BCM (Body Control Module), and a CAN bus, and the modules in the Control unit 2 are also connected to each other through bus communication.
When the transfer case mode switching control system of the present embodiment is used, as shown in fig. 2, the control method specifically includes the following steps:
s01, acquiring a control signal;
and S02, judging whether the control signals simultaneously satisfy: requesting the transfer case to perform 4L mode switching, enabling the gear of the transmission to be in an N gear, enabling the vehicle speed to be lower than a preset speed threshold value, and enabling the gradient signal to be lower than a preset gradient threshold value;
s03, when the control signals simultaneously meet all conditions, enabling the transmission to be locked in an N gear and enabling the transfer case to be in a neutral gear;
s04, correspondingly adjusting the rotating speed of the output shaft of the transmission according to the type of the 4L mode switching signal, judging whether the rotating speed of the output shaft of the transmission after adjustment and the rotating speed of the output shaft of the transfer case meet a preset proportion threshold value, and switching the 4L mode of the transfer case when the preset proportion threshold value is met;
and S05, judging whether the mode of the transfer case 4L is successfully switched or not, and releasing the N gear lock of the transmission when the mode is successfully switched so as to enable the transmission to enter a proper gear.
In the above steps, the preset speed threshold may be matched with safety and the whole vehicle, for example, it may be set to 20 km/h. The preset gradient threshold value can be generally set to 10%, and the stability of the vehicle speed and the safety of the vehicle can be ensured by adding the consideration factor of the gradient.
Further, it should be noted that, in order to facilitate the driver's understanding of the transfer mode switching situation, when it is determined that the control signals do not satisfy the respective conditions at the same time, it is preferable to provide condition information to be satisfied, which is presented by the vehicle meter 3. Further, the condition information displayed on the vehicle meter 3 at this time may be, for example: and the speed of the transmission is required to be placed in the N gear when the dynamic switching condition is not met, and the vehicle speed is lower than xx km/h.
In the prior art, the conventional 4L mode switching requires that the vehicle speed is 0, and the transmission is in the N-gear, which is mainly because in the 4L mode, the torque transmitted into the output shaft by the transfer case is amplified by about 2.5 times (different planetary sets and different amplification times), that is, the rotational speed of the input shaft and the output shaft of the transfer case has a 2.5-time speed difference. Therefore, to realize dynamic switching to engage the 4L mode, it is necessary to maintain the difference in rotational speed between the input shaft and the output shaft of the transfer case at about 2.5 times.
Based on this, in the above steps of this embodiment, the 4L mode switching signal type includes 4L mode engagement and 4L mode disengagement, and when the signal type is 4L mode engagement, the transmission control module 204 may be specifically utilized to raise the transmission output shaft speed by controlling the internal clutch of the transmission. And when the signal type is 4L mode exit, the speed of the output shaft of the transmission can be reduced by controlling the internal clutch of the transmission.
In detail, if the 4L mode is engaged, the rotating speed of the output shaft is increased by controlling the clutch inside the transmission, so that the rotating speed of the 4L mode planet carrier and the rear output shaft are at the same speed, and the engagement of the 4L mode combination sleeve and the planet carrier is facilitated. On the contrary, if the transfer case exits the 4L mode, the rotating speed of the output shaft is reduced by controlling the clutch inside the transmission, so that the input shaft and the output shaft in the transfer case have the same rotating speed. Therefore, the matching of the 4L mode in and out can be controlled through the transmission, so that the rotating speed of the output shaft is controlled under the condition of N-gear locking, the switching of the 4L mode shifting sliding sleeve is met, and the purpose of dynamically switching the 4L mode of the transfer case in low-speed driving is achieved.
In the above steps, whether or not the transfer 4L mode is successfully switched may be normally set to be determined within a preset time threshold range, which may be 25s, for example, and when it is determined that the 4L mode is completely switched within 25s, the determination result may be presented by the vehicle meter 3, and the presentation information may be "4L mode switching successful", for example. If it is not determined within 25s whether the 4L mode is switched completely, the switching is considered to have failed, and the determination result is presented by the vehicle meter 3, and the presentation information may be "4L mode switching failed, please retry", for example.
In the above steps, when the mode switching of the transfer case 4L is successful, the transmission N-gear lock is released and the transmission is put into a proper gear, which may specifically be obtained by the transmission control module 204 as a vehicle speed signal, a shifter gear signal and a transfer case mode signal, and after the transmission N-gear lock is released, the transmission Map is put into a proper gear.
At this time, the transmission Map may be a Map pre-stored in the transmission controller, and the method of obtaining the transmission gear from the transmission Map based on the vehicle speed signal, the shifter gear signal and the transfer mode signal may be referred to a related control method of the existing automatic transmission.
According to the transfer case mode switching control system and the corresponding control method thereof, the rotating speed of the output shaft of the transmission is adjusted according to the type of the 4L mode switching signal through the judgment of the vehicle speed, so that the rotating speed of the output shaft of the transmission and the rotating speed of the output shaft of the transfer case meet the preset proportion, the 4L mode of the transfer case can be dynamically switched in a driving state where the vehicle speed is lower than the preset speed threshold, and the defect that the driving pleasure of a vehicle is lack due to the switching of the 4L mode of the existing transfer case can be overcome.
In addition, the control system and the corresponding control method of the embodiment can realize the adjustment of the rotating speed of the output shaft in the transmission by locking the N gear of the transmission, and can also reduce the gear shifting impact and gear wear when the 4L mode is switched. In addition, after the 4L mode is switched, the transmission Map is matched with a proper gear, so that smooth output of the power of the automobile can be realized, and the practicability is good.
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 (10)
1. A transfer case mode switching control method, comprising:
acquiring control signals, wherein the control signals comprise a transfer case mode switching signal, a transmission gear signal and a vehicle speed signal;
judging whether the control signals simultaneously satisfy: requesting the transfer case to perform 4L mode switching, enabling the transmission gear to be in an N gear, and enabling the vehicle speed to be lower than a preset speed threshold;
when the control signals simultaneously meet various conditions, the transmission is locked at an N gear, and the transfer case is in a neutral gear;
correspondingly adjusting the rotating speed of the output shaft of the transmission according to the type of the 4L mode switching signal, judging whether the rotating speed of the output shaft of the transmission after adjustment and the rotating speed of the output shaft of the transfer case meet a preset proportion threshold value, and switching the 4L mode of the transfer case when the preset proportion threshold value is met;
and judging whether the mode of the transfer case 4L is successfully switched, and releasing the N gear lock of the transmission when the mode is successfully switched so as to enable the transmission to enter a proper gear.
2. The transfer case mode switching control method according to claim 1, characterized in that: the control signal further comprises a gradient signal, and the conditions simultaneously satisfied by the control signal include: the transfer case is requested to make a 4L mode shift with the transmission gear in N, with vehicle speed below a preset speed threshold and the grade signal below a preset grade threshold.
3. The transfer mode switching control method according to claim 2, characterized in that: the preset gradient threshold value is 10%.
4. The transfer case mode switching control method according to claim 1, characterized in that: and when the control signals do not simultaneously meet all conditions, prompting the condition information required to be met through a vehicle instrument.
5. The transfer mode switching control method according to claim 1, characterized in that: the 4L mode switching signal types comprise 4L mode entering and 4L mode exiting, when the 4L mode is entering, the rotating speed of the output shaft of the transmission is increased by controlling the clutch inside the transmission, and when the 4L mode exits, the rotating speed of the output shaft of the transmission is reduced by controlling the clutch inside the transmission.
6. The transfer case mode switching control method according to claim 1, characterized in that: whether the mode of the transfer case 4L is successfully switched is judged within a preset time threshold range, and a judgment result is prompted through a vehicle instrument.
7. The transfer mode switching control method according to any one of claims 1 to 6, characterized in that: and when the mode of the transfer case 4L is successfully switched, acquiring a vehicle speed signal, a gear shift signal of a gear shifter and a transfer case mode signal, and after the N-gear lock of the transmission is released, entering a proper gear according to the Map of the transmission.
8. A transfer case mode switching control system, comprising:
a transfer mode switch (1), wherein the transfer mode switch (1) is operated and can output a transfer mode switching signal;
the control unit (2), the control unit (2) is used for obtaining control signals, the control signals comprise a transfer case mode switching signal, a transmission gear signal and a vehicle speed signal, and the control unit (2) executes the following control strategies according to the obtained control signals:
judging whether the control signals simultaneously satisfy: requesting the transfer case to perform 4L mode switching, enabling the transmission gear to be in an N gear, and enabling the vehicle speed to be lower than a preset speed threshold;
when the control signals simultaneously meet various conditions, the transmission is locked at an N gear, and the transfer case is in a neutral gear;
correspondingly adjusting the rotating speed of the output shaft of the transmission according to the type of the 4L mode switching signal, judging whether the rotating speed of the output shaft of the transmission after adjustment and the rotating speed of the output shaft of the transfer case meet a preset proportion threshold value, and switching the 4L mode of the transfer case when the preset proportion threshold value is met;
and judging whether the mode of the transfer case 4L is successfully switched, and releasing the N gear lock of the transmission when the mode is successfully switched so as to enable the transmission to enter a proper gear.
9. The transfer case mode switching control system according to claim 8, characterized in that: the control signal further comprises a gradient signal, and the conditions simultaneously satisfied by the control signal include: requesting the transfer case to perform 4L mode switching, enabling the transmission gear to be in an N gear, enabling the vehicle speed to be lower than a preset speed threshold value and enabling the gradient signal to be lower than a preset gradient threshold value.
10. The transfer mode switching control system according to claim 9, characterized in that: the control unit (2) comprises a transfer case control module (201), an EMS (202), a vehicle body stabilizing system module (203) and a transmission control module (204) which are connected.
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| CN202110231879.0A CN114562557B (en) | 2021-03-02 | 2021-03-02 | Transfer case mode switching control method and system |
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| CN202110231879.0A CN114562557B (en) | 2021-03-02 | 2021-03-02 | Transfer case mode switching control method and system |
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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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| CN201425089Y (en) * | 2009-05-27 | 2010-03-17 | 徐州重型机械有限公司 | Gear switching control system of transfer case |
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