CN110792763B - Gear shifting control method and device - Google Patents

Gear shifting control method and device Download PDF

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Publication number
CN110792763B
CN110792763B CN202010003432.3A CN202010003432A CN110792763B CN 110792763 B CN110792763 B CN 110792763B CN 202010003432 A CN202010003432 A CN 202010003432A CN 110792763 B CN110792763 B CN 110792763B
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gradient value
current vehicle
running position
vehicle running
gear mode
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CN110792763A (en
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刘强
曹永�
宗伟
郭太民
陈彦波
杨磊
王洪志
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Shengrui Transmission Co Ltd
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Shengrui Transmission 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
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/60—Inputs being a function of ambient conditions
    • F16H59/66—Road conditions, e.g. slope, slippery
    • 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
    • F16H61/0213—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 characterised by the method for generating shift signals
    • 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
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/60—Inputs being a function of ambient conditions
    • F16H59/66—Road conditions, e.g. slope, slippery
    • F16H2059/663—Road slope

Abstract

The invention provides a gear shifting control method and a gear shifting control device, which relate to the technical field of vehicle driving, and the gear shifting control method comprises the following steps: acquiring a gradient value of a current vehicle driving position; and when the acquired gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode within the preset time, controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position. The gear shifting control device provided by the invention applies the gear shifting control method and comprises a detection module and a control module. The invention solves the technical problems that when the automatic transmission automobile ascends on a mountain land, the change of the slope of the mountain land is too fast, gear shifting is easy to frequently occur, the gear box of the automobile is lost, and the driving comfort is reduced in the prior art.

Description

Gear shifting control method and device
Technical Field
The invention relates to the technical field of vehicle driving, in particular to a gear shifting control method and device.
Background
The automatic transmission automobile can enter different driving modes when running under different road conditions. When the automatic transmission automobile ascends a slope on a mountain land, the automatic transmission automobile can enter a mountain driving mode in order to ensure that the automatic transmission automobile has enough dynamic property.
The mountain driving mode has multiple gears, and different gears correspond to different gradient value ranges. When the automatic transmission automobile ascends a slope on a continuous mountain road with large slope change, the automatic transmission automobile can shift along with the change of the slope. The driving force of the automatic transmission automobile can be adjusted through gear shifting, and then the automatic transmission automobile can keep better power for a long time on a continuous mountain road with large gradient change.
The existing automatic transmission automobile enters a mountain driving mode and then shifts gears is characterized in that the mass of the whole automobile and the acceleration during driving are detected, a road gradient value is calculated according to the mass of the whole automobile and the acceleration during driving, and whether the gears are shifted or not is judged according to the calculated road gradient value.
However, most mountain roads are rugged and bumpy, so that the gradient of the mountain land changes too fast, and therefore when the automatic transmission automobile ascends the mountain land, the gear shifting is easy to frequently shift, the automobile gearbox is lost, and the driving comfort is reduced.
Disclosure of Invention
The invention aims to provide a gear shifting control method and a gear shifting control device, which are used for solving the technical problems that when an automatic transmission automobile ascends a slope on a mountain land, the change of the slope of the mountain land is too fast, gear shifting is easy to frequently occur, the gear box of the automobile is lost, and the driving comfort is reduced in the prior art.
The invention provides a gear shifting control method, which comprises the following steps:
acquiring a gradient value of a current vehicle driving position;
and when the acquired gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode within the preset time, controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position.
Further, the predetermined time includes a first predetermined time; when the obtained gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the obtained gradient value of the current vehicle running position corresponds to the same gear mode within a preset time, controlling the vehicle to shift to the gear mode corresponding to the obtained gradient value of the current vehicle running position, and the method comprises the following steps:
and when the gradient value of the current vehicle running position acquired in the first preset time is higher than the gradient value range corresponding to the gear mode of the current vehicle and the gradient value of the current vehicle running position acquired in the first preset time corresponds to the same gear mode, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position acquired.
Further, the predetermined time also comprises a second predetermined time;
when the obtained gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the obtained gradient value of the current vehicle running position corresponds to the same gear mode within the preset time, the method for controlling the vehicle to shift to the gear mode corresponding to the obtained gradient value of the current vehicle running position further comprises the following steps:
when the gradient value of the current vehicle running position acquired in the second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, the gradient value of the current vehicle running position acquired in the second preset time corresponds to the same gear mode, and the gradient value of the current vehicle running position acquired in the second preset time is lower than the buffer value of the same gear mode corresponding to the gradient value of the current vehicle running position, the vehicle is controlled to shift to the gear mode corresponding to the gradient value of the current vehicle running position;
the buffer value is lower than the minimum value of the slope value range corresponding to the corresponding gear mode.
Further, the acquiring of the gradient value of the current vehicle running position includes:
acquiring a gradient value of a current vehicle running position, and taking the time point as a starting point of preset time if the gradient value of the current vehicle running position exceeds a gradient value range corresponding to a gear mode of the current vehicle;
and continuously acquiring the gradient value of the current vehicle running position, if the gradient value of the current vehicle running position does not reach the preset time, taking the time point as the starting point of the next preset time when the gradient value of the current vehicle running position exceeds the gradient value range of the gear mode corresponding to the gradient value when the preset time is entered and also exceeds the gradient value range corresponding to the gear mode of the current vehicle, and controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position until the gradient value of the current vehicle running position acquired in the preset time corresponds to the same gear mode.
Further, the difference between the buffer value and the minimum value of the range of the gradient value corresponding to the corresponding shift mode is two degrees.
Further, the first predetermined time is less than the second predetermined time.
Further, the gradient value of the current vehicle running position is obtained by a gradient sensor provided on the vehicle.
The invention provides a gear shifting control device, which applies any one of the gear shifting control methods in the technical scheme, and the device comprises:
the detection module is used for acquiring the gradient value of the current vehicle driving position when the vehicle ascends a slope;
and the control module is used for controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position when the acquired gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode in a preset time.
Further, the control module is further configured to:
and when the gradient value of the current vehicle running position acquired in the first preset time is higher than the gradient value range corresponding to the gear mode of the current vehicle and the gradient value of the current vehicle running position acquired in the first preset time corresponds to the same gear mode, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position acquired.
Further, the control module is further configured to:
and when the gradient value of the current vehicle running position acquired in the second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, the gradient value of the current vehicle running position acquired in the second preset time corresponds to the same gear mode, and the gradient value of the current vehicle running position acquired in the second preset time is lower than the buffer value corresponding to the same gear mode and corresponding to the gradient value of the current vehicle running position, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the acquired current vehicle running position.
The gear shifting control method and the gear shifting control device provided by the invention have the following beneficial effects:
the gear shifting control method provided by the invention comprises the following steps: acquiring a gradient value of a current vehicle driving position; and when the acquired gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode within the preset time, controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position. When the vehicle ascends a slope on a road with a fast slope change, the situation that the vehicle returns to the slope value range corresponding to the driving mode immediately after the slope value exceeds the slope value range corresponding to the current driving mode of the vehicle easily occurs. For the vehicle applying the gear shifting control method provided by the invention, in the driving process, the driving mode corresponding to the gradient value of the driving position of the vehicle is changed and is not maintained in the changed driving mode within the preset time, so that the vehicle is not shifted to the gear mode corresponding to the gradient value of the current driving position of the vehicle. It should be noted that, because the grade changes faster, the vehicle can cross the section with faster grade change without shifting gears. According to the gear shifting control method provided by the invention, the preset time is added in the judgment condition, so that the gear can be prevented from being frequently switched when the vehicle runs on a road with a fast gradient change, the loss of a vehicle gearbox can be reduced, and the driving comfort is improved.
The invention provides a gear shifting control device which comprises a detection module and a control module. The detection module is used for acquiring the gradient value of the current vehicle running position when the automobile goes up a slope. The control module is used for controlling the vehicle to shift to the gear mode corresponding to the gradient value of the obtained current vehicle running position when the gradient value of the obtained current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the gradient value of the obtained current vehicle running position corresponds to the same gear mode in a preset time. The gear shifting control device provided by the invention applies the gear shifting control method, so that the gear shifting control device has the same beneficial effects as the gear shifting control method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flowchart of a shift control method according to an embodiment of the present invention;
FIG. 2 is another flowchart of a shift control method according to an embodiment of the present invention;
FIG. 3 is a flowchart of a shift control method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a shift control device according to a second embodiment of the present invention.
In the figure:
1-a detection module; 2-control module.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the shift control method according to the present embodiment includes:
acquiring a gradient value of a current vehicle driving position;
and when the acquired gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode within the preset time, controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position.
When the vehicle ascends a slope on a road with a fast slope change, the situation that the vehicle returns to the slope value range corresponding to the driving mode immediately after the slope value exceeds the slope value range corresponding to the current driving mode of the vehicle easily occurs. For the vehicle applying the gear shifting control method provided by the invention, in the driving process, the driving mode corresponding to the gradient value of the driving position of the vehicle is changed and is not maintained in the changed driving mode within the preset time, so that the vehicle is not shifted to the gear mode corresponding to the gradient value of the current driving position of the vehicle. It should be noted that, because the grade changes faster, the vehicle can cross the section with faster grade change without shifting gears.
According to the gear shifting control method provided by the invention, the preset time is added in the judgment condition, so that the gear can be prevented from being frequently switched when the vehicle runs on a road with a fast gradient change, the loss of a vehicle gearbox can be reduced, and the driving comfort is improved.
Therefore, the gear shifting control method provided by the embodiment relieves the technical problems that when the automatic transmission automobile ascends a slope on a mountain land, the automobile gearbox is lost and the driving comfort is reduced due to the fact that the slope of the mountain land changes too fast and the gear shifting is easy to frequently occur.
The slope value of the current driving position of the vehicle can be acquired in real time through a slope sensor or an angle sensor mounted on the vehicle, the acquired slope value can be converted into a slope signal by the angle sensor, and the slope signal is sent to an Electronic Stability Controller (ESC) in the vehicle. The ESC receives the gradient signal and then sends the gradient signal to an automatic Transmission Control Unit (TCU) in the vehicle through a bus in a Controller Area Network (CAN) in the vehicle.
In the present embodiment, the slope value of the current vehicle travel position obtained by the vehicle is denoted as K, which varies with changes in the slope value on the road on which the vehicle is located. The gradient signal received by the TCU is the K value.
The TCU is provided with a gradient value range corresponding to each gear mode, and the TCU can judge which gradient value range of the gear mode the K value falls into. When the K value falls into a gear mode except the gear mode of the current vehicle, the TCU judges whether the gear mode in which the K value falls in the preset time is the gear mode all the time, if so, the vehicle is controlled to enter the gear mode, and if not, the vehicle stays in the original gear mode.
Further, the predetermined time may be 3 seconds. Since the predetermined time is short, the traveling speed of the vehicle is high, and thus the distance of the slope on which the vehicle travels within 3 seconds is also short. Since the range of the gradient value corresponding to each shift mode is constant, the gradient value of the conventional gradient does not change continuously in the range of the gradient corresponding to a plurality of shift modes within the short gradient distance. Therefore, the situation that the gradient value is continuously changed in the ramp range corresponding to a plurality of gear modes in a short distance can be ignored. Or when the slope value is continuously changed in the slope range corresponding to the plurality of gear modes, the gear shifting can be controlled manually, namely, the driver can judge to switch the vehicle to the gear required by vehicle climbing according to the road condition in front of the vehicle.
In practical application, the TCU is not used for judging the gradient value range corresponding to which gear mode the K value falls into, and the TCU is not used for judging whether the gear mode in which the K value falls into in the preset time is the gear mode all the time. At the moment, the driver can observe the road ahead, judge whether the vehicle needs to shift gears in time according to the driving skill and experience of the driver, and control the vehicle to shift gears in time.
In the present embodiment, the predetermined time includes a first predetermined time. As shown in fig. 2, when the obtained gradient value of the current vehicle driving position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the obtained gradient value of the current vehicle driving position corresponds to the same gear mode within a predetermined time, controlling the vehicle to shift to the gear mode corresponding to the obtained gradient value of the current vehicle driving position includes: and when the gradient value of the current vehicle running position acquired in the first preset time is higher than the gradient value range corresponding to the gear mode of the current vehicle and the gradient value of the current vehicle running position acquired in the preset time corresponds to the same gear mode, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position acquired.
Further, the first predetermined time may be the above-mentioned 3 seconds predetermined time, and the first predetermined time is denoted as T-inThe first predetermined time is set in the TCU. The TCU is also provided with a timing unit, when the gradient value range in which the K value falls is not the gradient value range corresponding to the gear mode of the current vehicle, the timing unit starts timing, the time counted by the timing unit is recorded as T, and the T value is used for being equal to the T value-inAnd (5) comparing the values. By simultaneously comparing K value with range of gradient value, and T value with T-inThe TCU can realize the process of judging whether the gear mode in which the K value falls in the preset time is the gear mode when the K value falls in the gear mode except the gear mode in which the current vehicle is located.
Taking the three-level gear mode as an example, where the mountain driving mode of the vehicle includes the first mountain mode, the second mountain mode, and the third mountain mode, respectively, the switching process of the gears during the uphill process of the vehicle will be described below. The grade of the first mountain land mode, the grade of the second mountain land mode and the grade of the third mountain land mode are gradually increased, the power provided by the first mountain land mode for the vehicle is smaller than the power provided by the second mountain land mode for the vehicle, and the power provided by the second mountain land mode for the vehicle is smaller than the power provided by the third mountain land mode for the vehicle. The shift from the first mountain mode to the second mountain mode and the shift from the second mountain mode to the third mountain mode are upshifts.
Wherein, the slope value range corresponding to the first mountain land mode is marked as [ K ]1-in，K2-in) And the slope value range corresponding to the second mountain land mode is recorded as [ K ]2-in，K3-in) And the slope value range corresponding to the third mountain land mode is recorded as [ K ]3-in，∞)。
After the TCU obtains the K value, the TCU judges the gradient value range in which the K value falls and judges whether the T value is larger than or equal to the preset time.
When the gradient value of the current vehicle running position acquired in the first preset time is higher than the gradient value range corresponding to the gear mode of the current vehicle, namely the vehicle needs to be shifted up, the TCU not only judges the gradient value range in which the K value falls, but also judges whether the T value is larger than or equal to the first preset time. As shown in FIG. 3, when the K value falls within the range of the slope value corresponding to the first mountain mode, i.e., K2-in＞K≥K1-inAnd the value of T is greater than or equal to a first predetermined time, namely T is more than or equal to T-inThe TCU controls the vehicle to enter a first mountain mode. If neither of the two conditions is met, or one of the conditions is not met, the vehicle remains in the current operating mode, such as a normal driving mode.
Wherein, as shown in fig. 3, when the K value falls within the range of the slope value corresponding to the second mountain mode, i.e. K3-in＞K≥K2-inAnd the value of T is greater than or equal to a first predetermined time, namely T is more than or equal to T-inThe TCU may control the vehicle to enter the second mountain mode. If neither of the above conditions is met, or one of the conditions is not met, the vehicle remains in the current operating mode, such as the first mountain mode.
When the K value falls into the slope value range corresponding to the third mountain land mode, namely K is more than or equal to K3-inAnd the value of T is greater than or equal to a first predetermined time, namely T is more than or equal to T-inThe TCU may control the vehicle to enter a third mountain mode. If neither of the above conditions is met, or one of the conditions is not met, the vehicle remains in the current operating mode, such as the second mountain mode.
Further, the predetermined time further includes a second predetermined time, and the second predetermined time may also be set in the TCU, where the second predetermined time is denoted as T-out。
As shown in fig. 2, when the obtained gradient value of the current vehicle driving position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the obtained gradient value of the current vehicle driving position corresponds to the same gear mode within a predetermined time, controlling the vehicle to shift to the gear mode corresponding to the obtained gradient value of the current vehicle driving position further includes: and when the gradient value of the current vehicle running position acquired in the second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, the gradient value of the current vehicle running position acquired in the preset time is corresponding to the same gear mode, and the gradient value of the current vehicle running position acquired in the second preset time is lower than the buffer value of the same gear mode corresponding to the gradient value of the current vehicle running position, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position acquired. The buffer value is lower than the minimum value of the slope value range corresponding to the corresponding gear mode.
When the gradient value of the current vehicle running position acquired in the second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, namely the vehicle needs to be downshifted, the TCU not only judges the gradient value range in which the K value falls, but also judges whether the T value is larger than or equal to the second preset time. When the vehicle needs to downshift, the slope of the slope in front of the vehicle is reduced, and the slope is slowed, in order to prevent the vehicle from downshifting too fast, a buffer value can be set for the slope value range corresponding to each gear mode. And when the gradient value of the current vehicle running position acquired in the second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, the gradient value corresponds to the same gear mode, and the gradient value is lower than the buffer value corresponding to the gear mode of the current vehicle in the second preset time, the vehicle can be downshifted.
When the vehicle needs to be downshifted, the buffer value is used as the minimum value of the gradient value range, namely the buffer value can adjust the gradient value range corresponding to each mountain land mode. The buffer value in the first mountain mode is recorded as K1-outAnd the buffer value in the second mountain mode is recorded as K2-outAnd the buffer value in the third mountain mode is recorded as K3-out. The slope value range corresponding to the adjusted third mountain land mode is recorded as (K)3-outInfinity), the range of slope values corresponding to the second mountain mode is noted as (K)2-out，K3-out]And the slope value range corresponding to the first mountain land mode is recorded as (K)1-out，K2-out]And the range of the slope value corresponding to the normal mode is recorded as [0, K ]1-out]。
As shown in FIG. 3, when the vehicle needs to downshift from the third mountain mode, if the K value falls within the range of the adjusted gradient value corresponding to the second mountain mode, that is, K is3-out≥K＞K2-outAnd the value of T is greater than or equal to a second predetermined time, i.e. T ≧ T-outThe TCU may control the vehicle to enter a switch from the third mountain mode to the second mountain mode. If neither of the above conditions is met, or one of the conditions is not met, the vehicle remains in the third mountain mode.
As shown in FIG. 3, when the vehicle needs to downshift from the third mountain mode, if the K value falls within the range of the adjusted gradient value corresponding to the first mountain mode, that is, K is2-out≥K＞K1-outAnd the value of T is greater than or equal to a second predetermined time, i.e. T ≧ T-outThe TCU controls the vehicle to enter the first mountain mode. If neither of the above conditions is met, or one of the conditions is not met, the vehicle remains in the third mountain mode.
As shown in FIG. 3, when the vehicle needs to downshift from the third mountain mode, if the K value falls within the range of the adjusted gradient value corresponding to the normal mode, that is, K is1-outK or more and T is greater than or equal to the second preset time, namely T is greater than or equal to T-outThe TCU controls the vehicle to enter the normal mode, i.e., the vehicle exits the mountain drive mode to enter the normal mode. If neither of the above conditions is met, or one of the conditions is not met, the vehicle remains in the third mountain mode.
The vehicle downshifts from the second mountain mode and the vehicle downshifts from the first mountain mode, and the determination process is the same as the above process, and is not described herein again.
Wherein the acquiring of the gradient value of the current vehicle running position includes: and acquiring the gradient value of the current vehicle running position, and taking the time point as the starting point of the preset time if the gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle. And continuously acquiring the gradient value of the current vehicle running position, if the gradient value of the current vehicle running position does not reach the preset time, taking the time point as the starting point of the next preset time when the gradient value of the current vehicle running position exceeds the gradient value range of the gear mode corresponding to the gradient value when the preset time is entered and also exceeds the gradient value range corresponding to the gear mode of the current vehicle, and controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position until the gradient value of the current vehicle running position acquired in the preset time corresponds to the same gear mode.
Through the process, the TCU can control the vehicle to shift to a required gear in time, and the power required by the vehicle when climbing a slope cannot be met due to delay in the shifting process is prevented.
The difference between the buffer value and the minimum value of the gradient value range corresponding to the corresponding gear mode is two degrees.
Further, in this embodiment, the minimum value and the buffer value in the range of gradient values corresponding to the first mountain land mode, the minimum value and the buffer value in the range of gradient values corresponding to the second mountain land mode, and the minimum value and the buffer value in the range of gradient values corresponding to the third mountain land mode are shown in table 1:
Figure 241772DEST_PATH_IMAGE001
TABLE 1
Wherein the first predetermined time is less than the second predetermined time, T-inLess than T-out. Such as T-inIs 3 seconds, T-outIt was 15 seconds.
The first preset time is less than the second preset time, so that the process of downshifting can be slowed down when the vehicle is downshifted on the basis that the vehicle can be upshifted in time when the vehicle is upshifted.
The buffer value is set and the first preset time is smaller than the second preset time, so that the process of downshifting can be slowed down when the vehicle downshifts, and the driving comfort is further improved.
In the present embodiment, before the gradient value of the current vehicle running position is acquired, the shift control method further includes: and establishing a mountain driving model according to the gradient value, wherein the mountain driving model comprises a plurality of gear modes, and any one of the gear modes corresponds to a gradient value range.
This mountain region driving model can be for the mountain region driving model that sets up on current electric automobile or the mixed automobile, and a plurality of fender position modes can be for each fender position mode in the mountain region driving model that sets up on current electric automobile or the mixed automobile. Any stage gear mode corresponds to a gradient value range, and the gradient value ranges of the adjacent stage gear modes are continuous but not coincident.
The present embodiment preferably obtains the value of the gradient of the current vehicle running position by a gradient sensor provided on the vehicle.
Wherein the grade sensor may be an existing MSM417H grade sensor.
An acceleration sensor is arranged on an existing vehicle for obtaining a gradient value, the acceleration sensor is used for measuring the acceleration of the vehicle, and the gradient value can be calculated by combining the weight of the vehicle.
Compared with the mode that the slope value is calculated through acceleration and weight of the existing vehicle, the slope value can be directly measured by the slope sensor, and the measured slope value is more accurate and has smaller error compared with the slope value calculated through the existing vehicle.
Therefore, the accuracy of the acquired gradient value can be improved, and the accuracy of the vehicle gear shifting process can be further improved.
Example two:
the shift control device provided in this embodiment applies the shift control method in the first embodiment, and as shown in fig. 4, the shift control device provided in this embodiment includes: the detection module 1 is used for acquiring a gradient value of a current vehicle driving position when the vehicle ascends a slope; and the control module 2 is used for controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position when the acquired gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode in a preset time.
The detection module 1 is used for converting the measured gradient value into gradient information and then sending the gradient information to the control module 2. And the control module 2 receives the gradient information sent by the detection module 1 and then judges whether the gradient information exceeds the gradient value range corresponding to the gear mode of the current vehicle.
Wherein, the detection module 1 may be a gradient sensor. The Control module 2 is an automatic Transmission Control Unit (TCU) on the vehicle.
Further, the control module 2 is further configured to: and when the gradient value of the current vehicle running position acquired in the first preset time is higher than the gradient value range corresponding to the gear mode of the current vehicle and the gradient value of the current vehicle running position acquired in the first preset time corresponds to the same gear mode, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position acquired.
Further, the control module 2 is further configured to: and when the gradient value of the current vehicle running position acquired in the second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, the gradient value of the current vehicle running position acquired in the second preset time corresponds to the same gear mode, and the gradient value of the current vehicle running position acquired in the second preset time is lower than the buffer value corresponding to the same gear mode and corresponding to the gradient value of the current vehicle running position, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the acquired current vehicle running position.
The gear shift control device provided in this embodiment applies the gear shift control method in the first embodiment, so that the gear shift control device provided in this embodiment and the gear shift control method in the first embodiment can solve the same technical problem and achieve the same technical effect.
The shift control device that this embodiment provided has alleviated the automatic transmission car that exists among the prior art when the mountain region goes up a hill equally, because mountain region slope change is too fast and easily frequently shifts and the technical problem who loses motor transmission, reduce driving comfort.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A shift control method, characterized by comprising:
acquiring a gradient value of a current vehicle driving position;
when the obtained gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the obtained gradient value of the current vehicle running position corresponds to the same gear mode within the preset time, controlling the vehicle to shift to the gear mode corresponding to the obtained gradient value of the current vehicle running position;
the acquiring of the gradient value of the current vehicle driving position includes:
acquiring a gradient value of a current vehicle running position, and taking a time point when the gradient value of the current vehicle running position exceeds a gradient value range corresponding to a gear mode of the current vehicle as a starting point of preset time;
and continuously acquiring the gradient value of the current vehicle running position, if the gradient value of the current vehicle running position does not reach the preset time, taking the time point as the starting point of the next preset time when the gradient value of the current vehicle running position exceeds the gradient value range of the gear mode corresponding to the gradient value when the preset time is entered and also exceeds the gradient value range corresponding to the gear mode of the current vehicle, and controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position until the gradient value of the current vehicle running position acquired in the preset time corresponds to the same gear mode.
2. The shift control method according to claim 1, characterized in that the predetermined time includes a first predetermined time; when the acquired gradient value of the current vehicle running position exceeds a gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode within a preset time, controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position, and the method comprises the following steps:
and when the gradient value of the current vehicle running position acquired in the first preset time is higher than the gradient value range corresponding to the gear mode of the current vehicle and the gradient value of the current vehicle running position acquired in the first preset time corresponds to the same gear mode, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position acquired.
3. The shift control method according to claim 2, characterized in that the predetermined time further includes a second predetermined time;
when the obtained gradient value of the current vehicle running position exceeds a gradient value range corresponding to the gear mode of the current vehicle and the obtained gradient value of the current vehicle running position corresponds to the same gear mode within a preset time, controlling the vehicle to shift to the gear mode corresponding to the obtained gradient value of the current vehicle running position, and the method further comprises the following steps:
when the gradient value of the current vehicle running position acquired in second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, the gradient value of the current vehicle running position acquired in the second preset time corresponds to the same gear mode, and the gradient value of the current vehicle running position acquired in the second preset time is lower than the buffer value of the same gear mode corresponding to the gradient value of the current vehicle running position, the vehicle is controlled to shift to the gear mode corresponding to the gradient value of the current vehicle running position;
and the buffer value is lower than the minimum value of the gradient value range corresponding to the corresponding gear mode.
4. The shift control method according to claim 3, characterized in that the difference between the damping value and the minimum value of the range of gradient values corresponding to the shift position mode corresponding thereto is two degrees.
5. The shift control method according to claim 3, characterized in that the first predetermined time is less than the second predetermined time.
6. The shift control method according to any one of claims 1 to 5, characterized in that the gradient value of the current vehicle running position is obtained by a gradient sensor provided on the vehicle.
7. A shift control apparatus characterized by applying the shift control method according to any one of claims 1 to 6, the apparatus comprising:
the detection module is used for acquiring the gradient value of the current vehicle driving position when the vehicle ascends a slope;
and the control module is used for controlling the vehicle to shift to the gear mode corresponding to the acquired gradient value of the current vehicle running position when the acquired gradient value of the current vehicle running position exceeds the gradient value range corresponding to the gear mode of the current vehicle and the acquired gradient value of the current vehicle running position corresponds to the same gear mode in a preset time.
8. The shift control device of claim 7, wherein the control module is further configured to:
and when the gradient value of the current vehicle running position acquired in the first preset time is higher than the gradient value range corresponding to the gear mode of the current vehicle and the gradient value of the current vehicle running position acquired in the first preset time corresponds to the same gear mode, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the current vehicle running position acquired.
9. The shift control device of claim 8, wherein the control module is further configured to:
and when the gradient value of the current vehicle running position acquired in the second preset time is lower than the gradient value range corresponding to the gear mode of the current vehicle, the gradient value of the current vehicle running position acquired in the second preset time corresponds to the same gear mode, and the gradient value of the current vehicle running position acquired in the second preset time is lower than the buffer value corresponding to the same gear mode and corresponding to the gradient value of the current vehicle running position, controlling the vehicle to shift to the gear mode corresponding to the gradient value of the acquired current vehicle running position.
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CN113202640B (en) * 2020-12-22 2023-03-10 厦门雅迅网络股份有限公司 Multi-power switching method and system for engine
CN114658838B (en) * 2022-03-22 2023-12-08 陕西法士特齿轮有限责任公司 Automatic transmission gear control method and computer storage medium

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