Gear shifting method for uphill mode of automatic transmission
阅读说明：本技术 一种自动变速器上坡模式的换挡方法 (Gear shifting method for uphill mode of automatic transmission ) 是由 李翰博 赵令国 刘国栋 宁甲奎 马岩 李野 于 2019-10-15 设计创作，主要内容包括：本发明属于自动变速器技术领域,公开了一种自动变速器上坡模式的换挡方法,包括以下步骤：获取基准换挡表；计算不同上坡类型的车速补偿值,根据基准换挡表和车速补偿值获得复合换挡表；获取坡度信号值,并判断自动变速器的工作模式是否为上坡模式；若是,根据坡度信号值确定自动变速器的新上坡类型NewType；确定自动变速器的实际上坡类型ActType,当满足换挡条件时,根据实际上坡类型ActType对应复合换挡表进行换挡。本发明的有益效果：保证上坡模式换挡时的动力的充足和连续性；避免坡度信号值跳变造成新上坡类型的频繁变化,避免上坡类型切换导致换挡频繁现象的发生。(The invention belongs to the technical field of automatic transmissions, and discloses a gear shifting method for an uphill mode of an automatic transmission, which comprises the following steps: acquiring a reference gear shifting table; calculating vehicle speed compensation values of different uphill types, and obtaining a composite gear shifting table according to the reference gear shifting table and the vehicle speed compensation values; acquiring a gradient signal value, and judging whether the working mode of the automatic transmission is an uphill mode; if yes, determining a new uphill type NewType of the automatic transmission according to the gradient signal value; and determining the actual uphill type ActType of the automatic transmission, and when the gear shifting condition is met, shifting according to the composite gear shifting table corresponding to the actual uphill type ActType. The invention has the beneficial effects that: the sufficiency and continuity of power during the gear shifting in the uphill mode are ensured; the frequent change of a new uphill type caused by the jump of the gradient signal value is avoided, and the phenomenon of frequent gear shifting caused by switching of the uphill type is avoided.)
1. A method of shifting an uphill mode of an automatic transmission, comprising the steps of:
acquiring a reference gear shifting table;
calculating vehicle speed compensation values of different uphill types, and acquiring a composite gear shifting table according to the reference gear shifting table and the vehicle speed compensation values;
acquiring a gradient signal value, and judging whether the working mode of the automatic transmission is an uphill mode;
if yes, determining a new uphill type NewType of the automatic transmission according to the gradient signal value;
and determining the actual uphill type ActType of the automatic transmission, and when the gear shifting condition is met, shifting gears according to the composite gear shifting table corresponding to the actual uphill type ActType.
2. The shifting method of an uphill mode of an automatic transmission according to claim 1, wherein the step of obtaining a reference shift table includes:
constructing a first mapping table, wherein the first mapping table represents the uphill types corresponding to different uphill gradient values;
and constructing a second mapping table, wherein the second mapping table represents reference gear shifting points corresponding to different accelerator pedal opening degrees and different gear shifting types, and the reference gear shifting points comprise an upshift point UpB (ij, k) and a downshift point DwB (ij, k), wherein i represents a gear before gear shifting, j represents a gear after gear shifting, and k represents the accelerator pedal opening degree.
3. The shifting method of an uphill mode of an automatic transmission according to claim 2, wherein the step of calculating vehicle speed compensation values for different uphill types, and obtaining a composite shift table from the reference shift table and the vehicle speed compensation values comprises:
determining a reference shift type, wherein the reference shift type comprises a reference upshift type and a reference downshift type;
and calibrating a vehicle speed compensation value UpD _ m (ab) of a reference upshift type as a reference upshift compensation value, and a vehicle speed compensation value DwD _ m (cd) of a reference downshift type as a reference downshift compensation value, wherein a and c represent gears before shifting of the reference shift type, b and d represent gears after shifting of the reference shift type, and m represents an uphill type.
4. The method of shifting in an uphill mode of an automatic transmission of claim 3, wherein the step of calculating vehicle speed compensation values for different uphill types, and obtaining a composite shift table based on the reference shift table and the vehicle speed compensation values further comprises:
the vehicle speed compensation value calculation formula for the shift types other than the reference shift type is as follows:
UpD_m(ij)＝(Ra/Ri)·UpD_m(ab)；
DwD_m(ij)＝(Rc/Ri)·DwD_m(cd)；
where Ra, Rc represent the speed ratio of the shift-before-base shift type gear, and Ri represents the speed ratio of the shift-before-other-shift type gear.
5. The method of shifting in an uphill mode of an automatic transmission of claim 4, wherein the step of calculating vehicle speed compensation values for different uphill types, and obtaining a composite shift table based on the reference shift table and the vehicle speed compensation values further comprises:
and adding the reference gear shifting point and the vehicle speed compensation value to obtain the composite gear shifting table, wherein a calculation formula of an upshifting point Up _ m (ij, k) of an uphill type m in the composite gear shifting table is as follows:
Up_m(ij,k)＝UpB(ij,k)+UpD_m(ij)；
the calculation formula of the downshift point Dw _ m (ij, k) of the uphill type m in the shift table is as follows:
Dw_m(ij,k)＝DwB(ij,k)+DwD_m(ij)。
6. the method of shifting an uphill mode of an automatic transmission according to claim 5, wherein the step of determining a new uphill type of the automatic transmission based on the gradient signal value if yes comprises:
storing the gradient signal value in a data group according to a preset storage rule;
at each sampling period TOAnd if the maximum value in the counter is greater than or equal to the uphill type judgment threshold DeTypeLim, the new uphill type NewType is the uphill type corresponding to the maximum value counter, and otherwise, the new uphill type NewType keeps the current actual uphill type ActType.
7. The shifting method of an uphill mode of an automatic transmission according to claim 6, wherein the preset storage rule comprises: at each sampling period T0And discarding the first gradient signal value in the data group, sequentially advancing the rest gradient signal values, and storing the acquired gradient signal value in the last address in the data group.
8. The shifting method of an uphill mode of an automatic transmission according to claim 7, wherein the step of determining an actual uphill type ActType of the automatic transmission, and shifting the compound shift table according to the actual uphill type ActType when a shift condition is satisfied, includes:
comparing an uphill type switching flag bit TypeChg with 1, wherein if the uphill type switching flag bit TypeChg is equal to 1, the actual uphill type ActType is the new uphill type NewType determined in the previous step; if the uphill type switching flag bit TypeChg is not equal to 1, keeping the actual uphill type ActType at the last sampling moment unchanged.
9. The shifting method of an uphill mode of an automatic transmission according to claim 8, wherein the uphill type switching flag TypeChg is determined according to a shift progress flag ShiftState and a post-shift accumulated time NoSftCtr:
when the automatic transmission is in the shift process, ShiftState is 1, a time counter after shifting NoSftCtr is 0, and an uphill type switching flag TypeChg is 0;
when the automatic transmission is not in the process of shifting, ShiftState is 0, if NoSftCtr is equal to the post-shift time limit nostilm, TypeChg is 1, otherwise according to the sampling period T0The accumulation operation is performed on the post-shift time counter NoSftCtr.
Technical Field
The invention relates to the technical field of automatic transmissions, in particular to a gear shifting method for an uphill mode of an automatic transmission.
Background
An automatic transmission (such as AT, DCT, AMT and the like) is a device for automatically shifting gears according to the vehicle speed and the opening degree of an accelerator pedal, a gear shifting mode under a slope working condition is related to the actual slope value of a road, for example, a gear shifting table in an uphill mode is adopted for shifting gears when the road goes uphill, and a gear shifting table in a downhill mode is adopted for shifting gears when the road goes downhill. The existing uphill mode is divided into a first uphill mode and a second uphill mode according to the range of a slope road, and a gear shifting table of the first uphill mode and the second uphill mode is determined through calibration. When the vehicle runs on an uphill, the first uphill mode or the second uphill mode is selected according to the gradient range, the corresponding gear shifting table is adopted for gear shifting, and when specific conditions are met, the first uphill mode and the second uphill mode can be switched.
However, the existing gear shifting methods cannot meet different uphill slope ranges, and only two gear shifting methods have insufficient or excessive power in certain slope ranges.
Disclosure of Invention
The invention aims to provide a gear shifting method of an uphill mode of an automatic transmission, which aims to solve the problem that the traditional gear shifting method cannot meet different uphill slope ranges.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of shifting an uphill mode of an automatic transmission, comprising the steps of:
acquiring a reference gear shifting table;
calculating vehicle speed compensation values of different uphill types, and acquiring a composite gear shifting table according to the reference gear shifting table and the vehicle speed compensation values;
acquiring a gradient signal value, and judging whether the working mode of the automatic transmission is an uphill mode;
if yes, determining a new uphill type NewType of the automatic transmission according to the gradient signal value;
and determining the actual uphill type ActType of the automatic transmission, and when the gear shifting condition is met, shifting gears according to the composite gear shifting table corresponding to the actual uphill type ActType.
Preferably, the step of acquiring a reference shift table includes:
constructing a first mapping table, wherein the first mapping table represents the uphill types corresponding to different uphill gradient values;
and constructing a second mapping table, wherein the second mapping table represents reference gear shifting points corresponding to different accelerator pedal opening degrees and different gear shifting types, and the reference gear shifting points comprise an upshift point UpB (ij, k) and a downshift point DwB (ij, k), wherein i represents a gear before gear shifting, j represents a gear after gear shifting, and k represents the accelerator pedal opening degree.
Preferably, the step of calculating vehicle speed compensation values for different uphill types and obtaining a composite shift table from the reference shift table and the vehicle speed compensation values includes:
determining a reference shift type, wherein the reference shift type comprises a reference upshift type and a reference downshift type;
and calibrating a vehicle speed compensation value UpD _ m (ab) of a reference upshift type as a reference upshift compensation value, and a vehicle speed compensation value DwD _ m (cd) of a reference downshift type as a reference downshift compensation value, wherein a and c represent gears before shifting of the reference shift type, b and d represent gears after shifting of the reference shift type, and m represents an uphill type.
Preferably, the step of calculating vehicle speed compensation values for different uphill types and obtaining a composite shift table according to the reference shift table and the vehicle speed compensation values further includes:
the vehicle speed compensation value calculation formula for the shift types other than the reference shift type is as follows:
UpD_m(ij)＝(Ra/Ri)·UpDm(ab)；
DwD_m(ij)＝(Rc/Ri)·DwD_m(cd)；
where Ra, Rc represent the speed ratio of the shift-before-base shift type gear, and Ri represents the speed ratio of the shift-before-other-shift type gear.
Preferably, the step of calculating vehicle speed compensation values for different uphill types and obtaining a composite shift table according to the reference shift table and the vehicle speed compensation values further includes:
and adding the reference gear shifting point and the vehicle speed compensation value to obtain the composite gear shifting table, wherein a calculation formula of an upshifting point Up _ m (ij, k) of an uphill type m in the composite gear shifting table is as follows:
Up_m(ij,k)＝UpB(ij,k)+UpD_m(ij)；
the calculation formula of the downshift point Dw _ m (ij, k) of the uphill type m in the shift table is as follows:
Dw_m(ij,k)＝DwB(ij,k)+DwD_m(ij)。
preferably, if so, the step of determining a new uphill type NewType of the automatic transmission based on the gradient signal value includes:
storing the gradient signal value in a data group according to a preset storage rule;
at each sampling period TOAnd if the maximum value in the counter is greater than or equal to the uphill type judgment threshold DeTypeLim, the new uphill type NewType is the uphill type corresponding to the maximum value counter, and otherwise, the new uphill type NewType keeps the current actual uphill type ActType.
Preferably, the preset storage rule includes: at each sampling period T0And discarding the first gradient signal value in the data group, sequentially advancing the rest gradient signal values, and storing the acquired gradient signal value in the last address in the data group.
Preferably, the step of determining an actual uphill type ActType of the automatic transmission, and shifting the compound shift table according to the actual uphill type ActType when a shift condition is satisfied includes:
comparing an uphill type switching flag bit TypeChg with 1, wherein if the uphill type switching flag bit TypeChg is equal to 1, the actual uphill type ActType is the new uphill type NewType determined in the previous step; if the uphill type switching flag bit TypeChg is not equal to 1, keeping the actual uphill type ActType at the last sampling moment unchanged.
Preferably, the uphill type switching flag TypeChg is determined according to a shift progress flag ShiftState and an accumulated time after shifting NoSftCtr:
when the automatic transmission is in the shift process, ShiftState is 1, a time counter after shifting NoSftCtr is 0, and an uphill type switching flag TypeChg is 0;
when the automatic transmission is not in the process of shifting, ShiftState is 0, if NoSftCtr is equal to the post-shift time limit nostilm, TypeChg is 1, otherwise according to the sampling period T0The accumulation operation is performed on the post-shift time counter NoSftCtr.
The invention has the beneficial effects that: the method comprises the steps of firstly calibrating the vehicle speed compensation value of a reference gear, then calculating the vehicle speed compensation values of other gears, further determining a composite gear shifting table of each uphill type, and ensuring the sufficiency and continuity of power during gear shifting in an uphill mode; in addition, the new uphill type is determined according to the judgment method of the magnitude relation between the gradient signal value in the data set and the gradient boundary value of each uphill type, the frequent change of the new uphill type caused by the jump of the gradient signal value is avoided, the switching of the uphill type needs to meet the switching condition of the uphill type actually, and the gear shifting frequency phenomenon caused by the switching of the uphill type is avoided.
Drawings
FIG. 1 is a flowchart of a method of shifting an automatic transmission hill ascent mode provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating the determination of a New uphill type of an automatic transmission in a method of shifting an uphill mode of an automatic transmission according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a gradient signal value data acquisition method in a shifting method of an uphill mode of an automatic transmission according to an embodiment of the present invention;
fig. 4 is a schematic diagram for determining the current uphill type of the automatic transmission in the shifting method of the uphill mode of the automatic transmission according to the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present invention provides a shifting method of an uphill mode of an automatic transmission, including:
acquiring a reference gear shifting table;
calculating vehicle speed compensation values of different uphill types, and acquiring a composite gear shifting table according to the reference gear shifting table and the vehicle speed compensation values;
acquiring a gradient signal value, and judging whether the working mode of the automatic transmission is an uphill mode;
if yes, determining a new uphill type NewType of the automatic transmission according to the gradient signal value;
and determining the actual uphill type ActType of the automatic transmission, and when the gear shifting condition is met, shifting gears according to the composite gear shifting table corresponding to the actual uphill type ActType.
Specifically, a reference shift table is acquired, which is a shift table corresponding to the uphill type0, and is generally determined through calibration. The uphill type0 is an uphill type corresponding to an uphill gradient value slope being less than or equal to a reference gradient value slp1 (the reference gradient value slp1 should meet the requirement that 0 is greater than slp0 and is greater than slp1, wherein slp0 is a gradient limit value for entering an uphill mode and represents the minimum gradient value requirement for entering the uphill mode of the automatic transmission); the uphill type is that an uphill slope road is divided into a plurality of types by taking a plurality of reference gradient values as gradient boundary values. Taking five reference slope values slp1, slp2, slp3, slp4 and slp5(slp1 < slp2 < slp3 < slp4 < slp5) as an example, each uphill slope road type is shown in a mapping table 1. In the mapping table 1, the parameter in the first row is an uphill gradient value, and the parameter in the second row is an uphill type.
Mapping table 1
Taking a six-gear automatic transmission as an example, the reference gear shifting table of the uphill mode is shown in a mapping table 2. In the mapping table 2, the parameter in the first row is the accelerator pedal opening, the parameter in the first column is the shift type, for example, "1-2" represents "1 gear up 2 gear", and the other parameters are the up shift point UpB (ij, k) and the down shift point DwB (ij, k) of each shift type at different accelerator opening, where i represents the gear before shifting, j represents the gear after shifting, and k represents the accelerator pedal opening (unit:%).
Mapping table 2
Calculating vehicle speed compensation values of different uphill types, and acquiring a composite gear shifting table according to the reference gear shifting table and the vehicle speed compensation values, wherein the steps of:
an uphill mode reference shift type is first determined, including a reference upshift type and a reference downshift type. Then, aiming at different uphill types, calibrating a vehicle speed compensation value UpD _ m (ab) of a reference upshift type as a reference upshift compensation value, and calibrating a vehicle speed compensation value DwD _ m (cd) of a reference downshift type as a reference downshift compensation value, wherein the larger the uphill gradient is, the larger the corresponding vehicle speed compensation value is; wherein a, c represent gears before shifting of the reference shift type, b, d represent gears after shifting of the reference shift type, and m represents an uphill type. The purpose of vehicle speed compensation is to shift the vehicle later on an uphill slope than on a flat road, so that sufficient power is ensured when the vehicle ascends the uphill slope. In addition, in order to make the number of engine revolutions change the same at each gear shifting of the automatic transmission, ensure that the degree of power change is basically the same at each gear shifting, and make the driver feel that the power changes continuously at each gear shifting, the vehicle speed compensation value of other gear shifting types except the reference gear shifting type is calculated by adopting the following formula:
UpD _ m (ij) · (Ra/Ri) · UpD _ m (ab) and DwD _ m (ij) · (Rc/Ri) · DwD _ m (cd).
Where Ra, Rc represent the speed ratio of the shift-before-base shift type gear, and Ri represents the speed ratio of the shift-before-other-shift type gear. Taking "1 gear up and 2 gear" as a reference upshift type and "2 gear down and 1 gear" as a reference downshift type as an example, the vehicle speed compensation values of the reference shift type of the
And further obtaining the vehicle speed compensation value of each gear shifting type in each slope road range, see the mapping table 3. In the mapping table 3, the parameter in the first row is an uphill type, the parameter in the first column is a shift type, and the other parameters are vehicle speed compensation values of the shift types under different uphill types.
Mapping table 3
type1
type2
type3
type4
type5
1-2
UpD_1(12)
UpD_2(12)
UpD_3(12)
UpD_4(12)
UpD_5(12)
2-3
UpD_1(23)
UpD_2(23)
UpD_3(23)
UpD_4(23)
UpD_5(23)
3-4
UpD_1(34)
UpD_2(34)
UpD_3(34)
UpD_4(34)
UpD_5(34)
4-5
UpD_1(45)
UpD_2(45)
UpD_3(45)
UpD_4(45)
UpD_5(45)
5-6
UpD_1(56)
UpD_2(56)
UpD_3(56)
UpD_4(56)
UpD_5(56)
2-1
DwD_1(21)
DwD_2(21)
DwD_3(21)
DwD_4(21)
DwD_5(21)
3-2
DwD_1(32)
DwD_2(32)
DwD_3(32)
DwD_4(32)
DwD_5(32)
4-3
DwD_1(43)
DwD_2(43)
DwD_3(43)
DwD_4(43)
DwD_5(43)
5-4
DwD_1(54)
DwD_2(54)
DwD_3(54)
DwD_4(54)
DwD_5(54)
6-5
DwD_1(65)
DwD_2(65)
DwD_3(65)
DwD_4(65)
DwD_5(65)
Further, a composite gear shifting table of each uphill type is obtained, and the composite gear shifting table is obtained by adding a reference gear shifting point in the mapping table 2 and a corresponding vehicle speed compensation value in the mapping table 3. The calculation formulas of the upshift point Up _ m (ij, k) and the downshift point Dw _ m (ij, k) of the uphill type m are as follows:
up _ m (ij, k) ═ UpB (ij, k) + UpD _ m (ij) and Dw _ m (ij, k) ═ DwB (ij, k) + DwD _ m (ij).
For example, under the
Up_1(34,90)＝UpB(34,90)+UpD_1(34)；
through the algorithm, the composite gear shifting table of each uphill type can be obtained. Taking the
Mapping table 4
The gradient signal value is then obtained and the transmission control unit is operated at each sampling period T0The method comprises the following steps of acquiring a gradient signal value in real time, wherein the gradient signal value can be acquired through two modes: firstly, a transmission control unit receives gradient signal values sent by other controllers through a CAN bus; and secondly, the transmission control unit obtains a gradient signal value in real time through calculation according to vehicle state information such as the engine rotating speed, the engine torque, the accelerator pedal opening and the like.
It is continuously determined whether the operation mode of the automatic transmission is the uphill mode. Firstly, judging whether an exit condition of an uphill mode is met, and if the exit condition of the uphill mode is met, exiting the uphill mode from a working mode of the automatic transmission; otherwise, judging whether the entering condition of the uphill mode is met, if the entering condition of the uphill mode is met, setting the working mode of the automatic transmission to be the uphill mode, and if not, exiting the uphill mode. And judging the exit condition and the entry condition of the uphill mode according to the acquired gradient signal value, the gear shift lever position, the vehicle speed, the transmission oil temperature, the accelerator pedal opening, the fault state and the like.
As in fig. 2, the determination of the new uphill type NewType of the automatic transmission is continued. Storing the acquired gradient signal value in a data group according to a preset storage rule, wherein the total number of data in the data group is SumLope, and each sampling period T isOAnd the counters ctr0, ctr1, ctr2, ctr3, ctr4 and ctr5 calculate the number of the types of the uphill slopes in the data group, and when the maximum value of the counters ctr0, ctr1, ctr2, ctr3, ctr4 and ctr5 is more than or equal to an uphill slope type judgment threshold DeTypeLim (the selection of DeTypeLim is related to SumType, DeTypeLim is more than 0.5. SumType), determining that NewType is the upslope type corresponding to the counter with the maximum value, otherwise, keeping NewType to be the current actual upslope type ActType. The method is mainly used for filtering the gradient signal value to judge the uphill type, and frequent change of a new uphill type caused by jumping of the gradient signal value due to road bump or other reasons is avoided.
With reference to the schematic diagram of the data acquisition method shown in fig. 3, the total number of data values SumSlope in the data set is 10, and the uphill type determination threshold deteype is 6. The specific determination method is exemplified as follows: for example, the maximum value among ctr0, ctr1, ctr2, ctr3, ctr4, and ctr5 is ctr3, and ctr3 is 6 or more, it is determined that the new uphill type of the automatic transmission is 3.
The preset storage rule specifically includes: at each sampling period T0The method comprises the steps of abandoning the first gradient signal value in a data set, sequentially advancing the rest gradient signal values, storing the acquired gradient signal value at the last address in the data set, namely abandoning the foremost data value of the data set and sequentially advancing the rest gradient signal values each time data is newly acquired, so that the newly acquired gradient signal value is located at the last address of the data set, and the data values in the data set can be guaranteed to be the latest.
Finally, the actual uphill type ActType of the automatic transmission is determined, and when the gear shifting condition is met, the automatic transmission shifts according to the composite gear shifting table corresponding to the ActType as shown in FIG. 4. The actual uphill type ActType of the automatic transmission is related to an uphill type switching flag bit TypeChg, and if the TypeChg is equal to 1, the ActType is set to the NewType acquired in the sixth step; if TypeChg is not equal to 1, the ActType at the last sampling instant is kept unchanged. The uphill type switching flag TypeChg is judged according to a shifting progress flag ShiftState and the accumulated time NoSftCtr after shifting: when the automatic transmission is in the process of shifting gears, ShiftState is 1, a time counter after shifting NoSftCtr is 0, and an uphill type switching flag TypeChg is 0; when the automatic transmission is not in the shifting process, ShiftState is 0, if NoSftCtr is equal to the post-shift time limit value NoSftLim, TypeChg is 1, otherwise an accumulation operation is performed on the post-shift time counter NoSftCtr according to the sampling period. The no-shift time limit value NoSftLim is a standard quantity in a control program and is used for limiting the interval time for switching from ActType to NewType when NewType and ActType are not equal, and the no-shift time limit value NoSftLim is used for avoiding the occurrence of the frequent shift phenomenon when uphill types are switched. The NoSftLim can be calibrated to a fixed value, and can also be determined by a table look-up method according to the types of upslopes before and after switching, such as a mapping table 5. In the mapping table 5, the parameter in the first row is NewType, the parameter in the first column is ActType, and the remaining parameters represent the time limit for switching from ActType to NewType, for example, NoSftLim34 represents the time limit for switching from the uphill type3 to the
Mapping table 5
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
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