CN114542714B - Method and device for adjusting gear of transfer case - Google Patents

Method and device for adjusting gear of transfer case Download PDF

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Publication number
CN114542714B
CN114542714B CN202210207604.8A CN202210207604A CN114542714B CN 114542714 B CN114542714 B CN 114542714B CN 202210207604 A CN202210207604 A CN 202210207604A CN 114542714 B CN114542714 B CN 114542714B
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vehicle
gear
speed
transfer case
rotating speed
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CN114542714A (en
Inventor
李建军
李俊茂
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BAIC Group ORV Co ltd
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BAIC Group ORV Co ltd
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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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • 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
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/32—Gear shift yokes, e.g. shift forks

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The embodiment of the application provides a method and a device for adjusting a gear of a transfer case, wherein the method comprises the following steps: receiving a gear shifting request of a vehicle transfer case; acquiring the current rotation speed of an output shaft of a transmission of a vehicle under the condition that the gear of the transmission is N gear; and adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed. And the transfer case gear of the vehicle is adjusted by judging the relation between the current rotating speed and the target rotating speed of the transmission output shaft, so that the flexibility of the adjustment of the transfer case gear is improved.

Description

Method and device for adjusting gear of transfer case
Technical Field
The application relates to the field of vehicle control, in particular to a method and a device for adjusting a gear of a transfer case.
Background
The full-time four-wheel-drive transfer case matched with the existing off-road vehicle generally has two gears of 4H and 4L, wherein the 4H gear is mainly applied to general off-road roads such as general highways, light sand, light mud, light snow and broken stone, the 4L gear is used for working conditions such as deep mud, deep sand, deep snow, vehicle getting rid of poverty and climbing a large slope which need larger torque output, and the 4H-4L gear is frequently switched when the off-road vehicle is used for complex road surfaces.
At present, when the transfer case is switched between 4H and 4L gears, the vehicle is in a stop state and can be shifted, and the shifting flexibility is poor.
Disclosure of Invention
The embodiment of the application provides a method and a device for adjusting a gear of a transfer case, which can solve the problem of poor gear shifting flexibility of the existing transfer case.
In order to solve the technical problems, the application is realized as follows:
in a first aspect, an embodiment of the present application provides a method for adjusting a gear of a transfer case, including:
receiving a gear shifting request of a vehicle transfer case;
acquiring the current rotation speed of an output shaft of a transmission of a vehicle under the condition that the gear of the transmission is N gear;
and adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed.
In a second aspect, an embodiment of the present application further provides an adjusting device for a gear of a transfer case, including:
the receiving module is used for receiving a gear shifting request of the vehicle transfer case;
the acquisition module is used for acquiring the current rotating speed of the transmission output shaft under the condition that the transmission gear of the vehicle is N gear;
and the adjusting module is used for adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed.
In the embodiment of the application, a gear shifting request of a vehicle transfer case is received; acquiring the current rotation speed of an output shaft of a transmission of a vehicle under the condition that the gear of the transmission is N gear; and adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed. In this way, the transfer case gear of the vehicle is adjusted by judging the relation between the current rotation speed and the target rotation speed of the transmission output shaft, so that the flexibility of the transfer case gear adjustment is improved.
Drawings
Fig. 1 is a flow chart of a method for adjusting a gear of a transfer case according to an embodiment of the present application;
FIG. 2 is a logic diagram of a method for adjusting a gear of a transfer case according to an embodiment of the present disclosure;
FIG. 3 is a logic diagram of operation between a transfer case and a transmission provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of a transfer case gear adjusting device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
The transfer case is a gear drive system, its input shaft is directly or through universal driving device connected with second shaft of speed variator, and its output shaft is respectively connected with every driving axle by means of universal driving device, and its basic structure is similar to that of general gear speed variator, and can function as auxiliary speed variator. The self-locking mechanism consists of a gear transmission mechanism and an operating mechanism, wherein the gear transmission mechanism consists of a series of gears, shafts, a shell and other parts, and the operating mechanism consists of an operating lever, a shifting fork shaft, a series of transmission rods, a self-locking interlocking device and the like.
In general, the transfer case is only seen on the off-road vehicle, and the off-road vehicle is driven by multiple axles only because the off-road vehicle is different from the common private civil vehicle and is driven by worse road and even without road, so that the driving condition is bad, and the transfer case is needed to increase the driving of the off-road vehicle.
At present, the full-time four-drive transfer case matched with the off-road vehicle generally has 4H gear and 4L gear, and the 4H gear is in a four-drive high-speed mode and is mainly applied to general off-road roads such as general highways, shallow sand, shallow mud, shallow snow, broken stones and the like. The 4L gear is in a four-wheel drive low-speed mode and is used for working conditions requiring larger torque output such as deep mud, deep sand, deep snow, vehicle getting rid of poverty, climbing a large slope and the like, and frequent switching of the 4H-4L gear can be frequently encountered when the complex road surface is off-road. The difference between 4L and 4H is that the transmission ratio of the vehicle is changed, and in short, compared with the low rotation speed of the wheels, the engine needs more rotation speed, so that the torque acting on the wheels is improved, and the vehicle which has to run at a low speed on the off-road surface has more stable running and better escaping capability due to the larger torque.
When the existing transfer case shifts gears in 4H-4L gear switching, when a vehicle is in a stopped state, a shifting fork drives a sliding sleeve to slide so as to realize gear shifting, and when the gear shifting is performed, the vehicle speed is required to be maintained to be more than 2S for judging the parking condition, and the gear shifting takes a long time. In addition, when the gear sleeve and the combined tooth top teeth are used in gear shifting, the probability of no upshift exists, the shift of the 4H/4L gear needs to be performed again when the shift is performed, and the flexibility is low.
Therefore, the application provides a transfer case gear adjusting method, and the transfer case gear adjusting method provided by the application is described in detail below.
Referring to fig. 1, fig. 1 is a flow chart of a method for adjusting a gear of a transfer case according to an embodiment of the present application, where the method includes:
step 110, receiving a gear shifting request of a vehicle transfer case;
the device for receiving the gear shift request of the vehicle transfer case may be a sensor, a physical key, a voice acquisition device, or the like, which is not limited to this implementation. Specifically, when a transfer case range handle provided in a vehicle is shifted, a transfer case range button provided in the vehicle is pressed, or a voice acquisition device provided in the vehicle acquires any one of a voice request for a transfer case shift in the vehicle, etc., a shift request for shifting the transfer case is received by a vehicle controller.
Step 120, acquiring the current rotation speed of the transmission output shaft under the condition that the transmission gear of the vehicle is N gear;
the transmission can change the running speed of the vehicle and the torque on the driving wheels, realize reversing running, realize neutral gear and the like in a larger range, and the transmission output shaft rotating speed can be adjusted through the combination and separation of the internal clutch and the brake.
In this embodiment, the transmission is an AT automatic transmission (hydraulic automatic transmission) which is composed of a hydraulic torque converter, a planetary gear and a hydraulic control system, and the speed and torque of the AT automatic transmission are changed by means of hydraulic transmission and gear combination, and the automatic transmission can automatically select the most suitable gear relative to a manual transmission, so that the operation of a driver becomes simple and labor-saving, the driving is stable, the comfort is good, and the dynamic load of a vehicle transmission system is reduced.
When the transmission is in the N range, i.e., neutral, the power between the engine and the transmission is in a disconnected state. At this time, the power output from the engine simply drives the transmission and the driving gear connected thereto, and is not transmitted to the output shaft, and the vehicle does not travel, but the wheels do not have braking force, and there is a risk of slipping or moving. In the case of a manual transmission, all gears idle on the shaft, engine power is not transferred to the wheels, and there is almost no load. While for an automatic gearbox, the different gearbox states are slightly different. For example, an AT automatic transmission, all clutches and brakes in the transmission are in an unlocking state in N gears, almost all gears can rotate freely, and the power output by an engine only drives a hydraulic torque converter and a driving gear connected with the hydraulic torque converter, and cannot be transmitted to wheels. The engine is usually in an idle state, the rotation speed of an oil pump of the gearbox is low, and the oil supply amount is limited, so that the lubrication of the gearbox is not very sufficient, the heat dissipation is poor, and the gearbox is damaged due to the fact that the so-called automatic gearbox is free to slide.
And step 130, adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed.
The current rotating speed is the rotating speed of the transmission output shaft before the transfer case is shifted, the target rotating speed is the rotating speed of the transmission output shaft after the transfer case is shifted, and the gear of the transfer case is adjusted by comparing the current rotating speed of the transmission output shaft with the target rotating speed of the transmission output shaft. For example: the target rotation speed is 2000 rotations.
In the embodiment of the application, a gear shifting request of a vehicle transfer case is received; acquiring the current rotation speed of an output shaft of a transmission of a vehicle under the condition that the gear of the transmission is N gear; and adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed. In this way, the transfer case gear of the vehicle is adjusted by judging the relation between the current rotation speed and the target rotation speed of the transmission output shaft, so that the flexibility of the transfer case gear adjustment is improved.
Optionally, step 130 includes:
acquiring the speed of the vehicle;
wherein, the speed of the acquired vehicle can be acquired by a speed sensor.
And under the condition that the vehicle speed is greater than zero and smaller than a preset vehicle speed, adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed.
The preset vehicle speed is a preset value, the preset value is used as a precondition for adjusting the gear of the transfer case, when the vehicle speed of the vehicle is between 0 and the preset vehicle speed, the vehicle controller can adjust the gear of the transfer case according to the relation between the current rotating speed of the output shaft of the transmission and the target rotating speed, and similarly, when the vehicle speed is greater than the preset vehicle speed, the vehicle controller can not adjust the gear of the transfer case, and specifically, when the vehicle speed is greater than the preset vehicle speed, the vehicle speed can be reduced by waiting for the reduction of the vehicle speed or by stepping on the brake. For example: the preset vehicle speed may be 40KM/h.
In this embodiment, in the case where the transmission gear is N-speed, the engine and the transmission are in a disconnected state, and at this time, the power output from the engine is not transmitted to the drive wheels, but the vehicle adjusts the transfer gear of the vehicle by acquiring the current rotation speed of the transmission output shaft of the vehicle and comparing it with the target rotation speed of the transmission output shaft, due to the inertia effect, according to the vehicle speed.
Optionally, the adjusting the transfer case gear of the vehicle according to the relationship between the current rotation speed and the target rotation speed when the vehicle speed is greater than zero and less than a preset vehicle speed includes:
and under the condition that the vehicle speed is greater than zero and smaller than a preset vehicle speed, if the current rotating speed is smaller than a target rotating speed, adjusting the transfer case gear of the vehicle to be in a 4H mode.
Specifically, when the vehicle speed is greater than zero and less than the preset vehicle speed, the current rotation speed of the transmission output shaft of the transfer case in the current gear is obtained, and when the current rotation speed of the transmission output shaft is less than the target rotation speed, the gear of the transfer case is 4L (four-wheel-drive low-speed mode) at this time, and in order to adapt to the gear of the transfer case in the target rotation speed, the gear of the transfer case needs to be adjusted to a 4H mode (four-wheel-drive high-speed mode). For example: the preset vehicle speed can be 40KM/h, and the target rotating speed is 2000 revolutions.
When the current rotation speed is less than 2000 rotations, at this time, the gear of the transfer case is 4L (four-drive low-speed mode), and in order to increase the current rotation speed, the gear of the transfer case needs to be adjusted to 4H (four-drive high-speed mode).
The vehicle in the four-wheel drive high-speed mode has higher ground grabbing force and higher stability.
Optionally, the adjusting the transfer case gear of the vehicle according to the relationship between the current rotation speed and the target rotation speed when the vehicle speed is greater than zero and less than a preset vehicle speed includes:
and under the condition that the vehicle speed is greater than zero and smaller than a preset vehicle speed, if the current rotating speed is greater than a target rotating speed, adjusting the transfer case gear of the vehicle to be in a 4L mode.
Specifically, when the vehicle speed is greater than zero and less than the preset vehicle speed, the current rotation speed of the transmission output shaft of the transfer case in the current gear is obtained, and when the current rotation speed of the transmission output shaft is greater than the target rotation speed, the gear of the transfer case is 4H (four-wheel-drive high-speed mode) at this time, and in order to adapt to the gear of the transfer case in the target rotation speed, the gear of the transfer case needs to be adjusted to a 4L mode (four-wheel-drive low-speed mode). For example: the preset vehicle speed can be 40KM/h, and the target rotating speed is 2000 revolutions.
When the current rotation speed is greater than 2000 rotations, at this time, the gear of the transfer case is 4H (four-drive high-speed mode), and in order to reduce the current rotation speed, the gear of the transfer case needs to be adjusted to 4L (four-drive low-speed mode).
The vehicle in the four-wheel drive low-speed mode has the advantages that the engine needs more rotating speed, so that the speed is reduced, and the torque acted on wheels is increased, so that the climbing capacity of the vehicle in the four-wheel drive low-speed mode is better, and the vehicle can cope with severe road conditions.
Optionally, step 120 includes:
acquiring the current gear of the transfer case under the condition that the transmission of the vehicle is in N gear;
and acquiring the current rotating speed of the transmission output shaft according to the current gear of the transfer case.
In this embodiment, according to the current gear of the transfer case, the current rotation speed of the transmission output shaft corresponding to the current gear is obtained, and different gears of the transfer case are matched with the rotation speeds of different transmission output shafts. For example: when the gear of the transfer case is 4H (four-wheel drive high-speed mode), the rotating speed of the output shaft of the transmission is 0-4000 revolutions; when the gear of the transfer case is 4L (four-wheel drive low speed mode), the rotating speed of the output shaft of the transmission is 0-2000 revolutions.
Referring to fig. 2 and 3, the working logic diagram of a method for adjusting a gear of a transfer case according to an embodiment of the present invention is shown as follows:
receiving a gear shifting request from a driver for adjusting the gear of the transfer case, wherein the request can be from 4L to 4H or from 4H to 4L;
acquiring a gear of a vehicle transmission, wherein when the gear of the vehicle transmission is N gears, the current speed of the vehicle is acquired, and when the gear of the current vehicle transmission is not N gears, the gear of the vehicle transmission is required to be switched to N gears;
acquiring the vehicle speed, under the condition that the current vehicle speed of the vehicle is greater than zero and smaller than the preset vehicle speed, stirring the gear of the transfer case from 4H or 4L to N gear under the condition that the vehicle speed is greater than zero and smaller than the preset vehicle speed while the vehicle speed is in N gear, for example: the preset vehicle speed is 40KM/h, and when the current vehicle speed of the vehicle is greater than the preset vehicle speed, the vehicle speed needs to be adjusted to be lower than the preset vehicle speed, specifically, the vehicle speed can be reduced by waiting for the reduction of the vehicle speed or by stepping on a brake, which is not limited in this embodiment.
Under the condition that the transfer case is in N gear, acquiring the current rotation speed of the transmission output shaft under the current gear, comparing the rotation speed with the target rotation speed, and when the current rotation speed is smaller than the target rotation speed, increasing the current rotation speed, namely, regulating the rotation speed of the output shaft by a brake in the transmission of the vehicle until the rotation speed is larger than the target rotation speed; correspondingly, the gear of the transfer case is required to be shifted from 4L to 4H; when the current rotation speed is greater than the target rotation speed, the current rotation speed needs to be reduced, that is, the rotation speed of the output shaft of the vehicle is reduced by a brake in the vehicle transmission until the rotation speed is less than the target rotation speed, and correspondingly, the gear of the transfer case needs to be shifted from 4H to 4L, for example: the target rotation speed is 2000 rotations.
And switching the transfer case after rotating speed adjustment from the N gear to the target gear, and finishing gear shifting.
In order to facilitate understanding of the present application, the following explanation will be given by taking the driver as an example to judge that the vehicle needs to enter 4L (four-wheel drive low speed mode) from 4H (four-wheel drive high speed mode) according to road conditions:
the full-time four-wheel drive vehicle driven by the user is about to drive into a road with a large gradient from a general gentle road, at this time, the driver judges that the vehicle is in a 4L mode under the road condition with the large gradient, and the climbing capacity is better than that of the current 4H mode.
The driver presses a transfer case gear switch arranged in the vehicle to 4L;
the vehicle controller judges the gear of the transmission of the current vehicle, obtains the current speed of the vehicle under the condition that the gear of the transmission of the vehicle is N gear, and needs to switch the gear of the transmission of the vehicle to N gear when the gear of the transmission of the current vehicle is not N gear;
in the case where the current vehicle speed of the vehicle is acquired to be greater than zero and less than the preset vehicle speed, for example: the preset speed is 40KM/h, and when the current speed of the vehicle is greater than 40KM/h, the speed of the vehicle is required to be adjusted to be lower than 40 KM/h;
under the condition that the vehicle speed is greater than zero and less than 40KM/H and the vehicle speed is in N gear, at the moment, the shift motor switches the transfer case fork from the 4H gear to the N gear position of the transfer case;
under the condition that the transfer case is in N gear, the speed of the transmission output shaft is regulated through a clutch and a brake in the transmission until the rotation speed of the transmission output shaft meets the rotation speed requested by the transfer case, and the rotation speed is the rotation speed of the transmission output shaft matched with the transfer case when the transfer case is in 4L.
And switching the transfer case after rotating speed adjustment from the N gear to the target gear, and finishing gear shifting.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a transfer case gear adjusting device according to an embodiment of the present application, where the device includes:
a receiving module 210, configured to receive a shift request of a vehicle transfer case;
an obtaining module 220, configured to obtain a current rotation speed of the transmission output shaft when a transmission gear of the vehicle is N gear;
the adjusting module 230 is configured to adjust a transfer gear of the vehicle according to a relationship between the current rotational speed and a target rotational speed.
Optionally, the adjusting module 230 includes:
the first acquisition submodule is used for acquiring the speed of the vehicle;
and the adjusting sub-module is used for adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed under the condition that the vehicle speed is larger than zero and smaller than the preset vehicle speed.
Optionally, the adjusting sub-module includes:
and the first adjusting unit is used for adjusting the transfer case gear of the vehicle to be in a 4H mode if the current rotating speed is smaller than the target rotating speed under the condition that the vehicle speed is larger than zero and smaller than the preset vehicle speed.
Optionally, the adjusting sub-module includes:
and the second adjusting unit is used for adjusting the transfer case gear of the vehicle to be in a 4L mode if the current rotating speed is greater than the target rotating speed under the condition that the vehicle speed is greater than zero and less than the preset vehicle speed.
Optionally, the acquiring module includes:
the second acquisition sub-module is used for acquiring the current gear of the transfer case under the condition that the transmission of the vehicle is in N gear;
and the determining submodule is used for acquiring the current rotating speed of the transmission output shaft according to the current gear of the transfer case.
It should be noted that the device corresponds to the method for adjusting the gear of the transfer case shown in fig. 1, and all embodiments of the method for adjusting the gear of the transfer case shown in fig. 1 are applicable to the embodiment of the device, and the same technical effects can be achieved.
The embodiments of the present application have been described in connection with the accompanying drawings, but the present application is not limited to the above-described embodiments, which are intended to be illustrative only and not limiting, and many forms can be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims (2)

1. A method of adjusting a transfer case gear comprising:
receiving a gear shifting request of a vehicle transfer case;
acquiring the current rotation speed of an output shaft of a transmission of a vehicle under the condition that the gear of the transmission is N gear;
according to the relation between the current rotating speed and the target rotating speed, adjusting the transfer case gear of the vehicle;
the adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed comprises the following steps:
acquiring the speed of the vehicle;
under the condition that the vehicle speed is greater than zero and smaller than a preset vehicle speed, adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed; namely, when the vehicle speed is greater than the preset vehicle speed, the vehicle controller cannot adjust the gear of the transfer case, and specifically, when the vehicle speed is greater than the preset vehicle speed, the vehicle speed can be reduced by waiting for the reduction of the vehicle speed or by stepping on a brake;
and under the condition that the vehicle speed is greater than zero and smaller than a preset vehicle speed, adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed, wherein the transfer case gear comprises:
if the current rotating speed is smaller than the target rotating speed under the condition that the vehicle speed is larger than zero and smaller than the preset vehicle speed, adjusting the transfer case gear of the vehicle to be in a 4H mode;
and under the condition that the vehicle speed is greater than zero and smaller than a preset vehicle speed, adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed, wherein the transfer case gear comprises:
if the current rotating speed is greater than the target rotating speed under the condition that the vehicle speed is greater than zero and smaller than the preset vehicle speed, adjusting the transfer case gear of the vehicle to be in a 4L mode;
the obtaining the current rotation speed of the transmission output shaft under the condition that the transmission of the vehicle is in N gear comprises the following steps:
acquiring the current gear of the transfer case under the condition that the transmission of the vehicle is in N gear;
and acquiring the current rotating speed of the transmission output shaft according to the current gear of the transfer case.
2. An adjustment device for a transfer case gear, comprising:
the receiving module is used for receiving a gear shifting request of the vehicle transfer case;
the acquisition module is used for acquiring the current rotating speed of the transmission output shaft under the condition that the transmission gear of the vehicle is N gear;
the adjusting module is used for adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed;
the adjustment module includes:
the first acquisition submodule is used for acquiring the speed of the vehicle;
the adjusting sub-module is used for adjusting the transfer case gear of the vehicle according to the relation between the current rotating speed and the target rotating speed under the condition that the vehicle speed is larger than zero and smaller than the preset vehicle speed;
the conditioning sub-module includes:
the first adjusting unit is used for adjusting the transfer case gear of the vehicle to be in a 4H mode if the current rotating speed is smaller than the target rotating speed under the condition that the vehicle speed is larger than zero and smaller than the preset vehicle speed;
the conditioning sub-module includes:
the second adjusting unit is used for adjusting the transfer case gear of the vehicle to be in a 4L mode if the current rotating speed is larger than the target rotating speed under the condition that the vehicle speed is larger than zero and smaller than the preset vehicle speed;
the acquisition module comprises:
the second acquisition sub-module is used for acquiring the current gear of the transfer case under the condition that the transmission of the vehicle is in N gear;
and the determining submodule is used for acquiring the current rotating speed of the transmission output shaft according to the current gear of the transfer case.
CN202210207604.8A 2022-03-04 2022-03-04 Method and device for adjusting gear of transfer case Active CN114542714B (en)

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