CN114738482B - Dual clutch transmission gear selection method, system and computer equipment - Google Patents
Dual clutch transmission gear selection method, system and computer equipment Download PDFInfo
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- CN114738482B CN114738482B CN202110018834.5A CN202110018834A CN114738482B CN 114738482 B CN114738482 B CN 114738482B CN 202110018834 A CN202110018834 A CN 202110018834A CN 114738482 B CN114738482 B CN 114738482B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/18—Preventing unintentional or unsafe shift, e.g. preventing manual shift from highest gear to reverse gear
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a gear selection method of a dual clutch transmission, which comprises the following steps: judging whether a gear fault exists currently according to the gear fault information; when gear faults exist, gear selection is carried out according to fault information; when no gear failure exists, judging whether a gear shifting requirement exists currently according to the required gear and the current gear; when a gear shifting requirement exists, gear selection is carried out according to the switching state and the relation between the required gear and the current gear; and when the gear shifting requirement does not exist, gear selection is performed according to the relation between the preselected gear and the current gear. The invention also discloses a gear selection system of the dual clutch transmission and computer equipment. By adopting the method and the device, the available gear can be selected based on the preselected gear, the required gear, the current gear and the fault information, and the flexibility is high.
Description
Technical Field
The invention relates to the field of vehicle speed change, in particular to a double-clutch transmission gear selection method, a double-clutch transmission gear selection system and computer equipment.
Background
Currently, dual clutch transmissions control the shift points of the transmission by calibrating shift lines. In order to realize gear shifting at a calibrated gear shifting point, a preselected gear is usually corrected by a vehicle speed offset based on related information such as acceleration, so that the gear is shifted in advance and the oil is filled into a clutch. Because the dual clutch transmission is provided with two input shafts, a required gear and a preselected gear which are detected based on a gear shift line can be coaxial with a current gear or different from the current gear, and in addition, the available gear needs to be selected to ensure the safe operation of the whole transmission when a gear fault exists, so that how to select a target gear on the dual clutch transmission shaft for picking and hanging is important.
The current gear decision method mainly focuses on the correction methods of the target gear and the preselected gear, but does not introduce a detailed control method and flow of gear selection in the whole operation process of the DCT, especially how to decide the required gear on the shaft when the preselected gear, the required gear and the current gear are coaxial and when a transmission fault exists.
Disclosure of Invention
The invention aims to solve the technical problem of providing a gear selection method, a system and computer equipment for a dual clutch transmission, which can realize quick gear shifting.
In order to solve the technical problems, the invention provides a gear selection method of a dual clutch transmission, which comprises the following steps: judging whether a gear fault exists currently according to the gear fault information; when gear faults exist, gear selection is carried out according to fault information; when no gear failure exists, judging whether a gear shifting requirement exists currently according to the required gear and the current gear; when a gear shifting requirement exists, gear selection is carried out according to the switching state and the relation between the required gear and the current gear; and when the gear shifting requirement does not exist, gear selection is performed according to the relation between the preselected gear and the current gear.
As an improvement of the above solution, the step of selecting a gear according to the fault information includes: judging whether the fault type of the gear fault is a stuck gear fault, if the fault type is a stuck gear fault, limiting a maximum available gear according to the stuck gear, and if the fault type is not the stuck gear fault, taking the maximum gear as the maximum available gear; and selecting gears according to the required gear, the current gear and the maximum available gear, wherein if the required gear is larger than the maximum available gear, the maximum available gear is used as the required gear and is not responded to the required gear, if the required gear is not larger than the maximum available gear and the current gear is different from the required gear, gear shifting is carried out by different shafts, and if the required gear is not larger than the maximum available gear and the current gear is coaxial with the required gear, gear shifting is carried out by different shafts twice.
As an improvement of the above scheme, the step of the off-axis gear shift includes: if the fault gear is only on the shaft of the current gear, the required gear is hung; if the fault gear is not only located on the shaft of the current gear, but also has a clamping stagnation fault on the shaft of the required gear, the gear is not required to be taken off; if the fault gear is not only located on the shaft of the current gear, and a non-jamming gear fault exists on the shaft of the required gear, and the fault gear is not the required gear, the required gear is hung; and if the fault gear is not only located on the shaft of the current gear, but also the shaft of the required gear has a non-jamming gear fault, and the fault gear is the required gear, the gear shifting is abandoned.
As an improvement of the above solution, the step of defining the maximum available gear according to the stuck gear includes: defining a required gear speed ratio according to a formula n > (x multiplied by m/y), wherein n is the required gear speed ratio, x is the clutch rotating speed of the transmission in a gear state after gear shifting, m is the speed ratio of the current gear, and y is the highest rotating speed allowed by the clutch; and limiting the maximum available gear according to the required gear speed ratio.
As an improvement of the above solution, the step of selecting a gear according to the switching state and the relation between the required gear and the current gear includes: setting a target gear according to a switching state and the relation between a required gear and a current gear, wherein if the clutch is not switched to the required gear and the required gear is different from the current gear, the required gear is used as the target gear, if the clutch is not switched to the required gear and the required gear is coaxial with the current gear, the different-axis gear which is close to the required gear and is in the range of the current gear and the required gear is used as the target gear, if the clutch is not switched to the required gear and the required gear is different from the current gear and is coaxial with the current gear, a neutral gear is used as the target gear, and if the clutch is switched to the required gear and the clutch pressure of the uncontrolled shaft is lower than a half-junction point, the preselected gear is used as the target gear; and carrying out gear shifting treatment according to the target gear and the combined gear.
As an improvement of the above-mentioned scheme, the step of selecting a gear according to the relation between the preselected gear and the current gear includes: judging whether the preselected gear is coaxial with the current gear, if so, taking the gear close to the preselected gear as a target gear, and if not, taking the preselected gear as the target gear; and carrying out gear shifting treatment according to the target gear and the combined gear.
As an improvement of the above solution, the step of engaging in the gear according to the target gear and the combined gear includes: judging whether a combined gear exists on an uncontrolled shaft, if the combined gear does not exist on the uncontrolled shaft, hanging the target gear, if the combined gear exists on the uncontrolled shaft and is not the target gear, picking the combined gear and hanging the target gear, and if the combined gear exists on the uncontrolled shaft and is the target gear, not hanging the gear.
As an improvement of the above-described aspect, the step of taking the off-axis gear close to the preselected gear as the target gear includes: if the preselected gear is equal to the current gear, taking the neutral gear as a target gear; if the preselected gear is greater than the current gear, taking the last gear of the preselected gear on the uncontrolled shaft as a target gear; and if the preselected gear is smaller than the current gear, taking the next gear of the preselected gear on the uncontrolled shaft as a target gear.
Correspondingly, the invention also provides a gear selection system of the dual clutch transmission, which comprises the following steps: the fault judging module is used for judging whether a gear fault exists currently according to the gear fault information; the first gear selection module is used for selecting gears according to the fault information when the fault judgment module judges that the gear fault exists currently; the demand judging module is used for judging whether a gear shifting demand exists currently according to the demand gear and the current gear when the fault judging module judges that the gear fault does not exist currently; the second gear selection module is used for selecting gears according to the switching state and the relation between the required gears and the current gears when the requirement judgment module judges that the gear shifting requirement exists currently; and the third gear selection module is used for selecting gears according to the relation between the preselected gear and the current gear when the requirement judgment module judges that the gear shifting requirement does not exist currently.
As an improvement of the above aspect, the first gear selection module includes: the range setting unit is used for judging whether the fault type of the gear fault is a stuck gear fault, if the fault type is a stuck gear fault, limiting the maximum available gear according to the stuck gear, and if the fault type is not the stuck gear fault, taking the maximum gear as the maximum available gear; the first gear selecting unit is used for taking the maximum available gear as the required gear and not responding to the required gear if the required gear is larger than the maximum available gear, shifting the gear by different shafts if the required gear is not larger than the maximum available gear and the current gear is different from the required gear, and shifting the gear by different shafts twice if the required gear is not larger than the maximum available gear and the current gear is coaxial with the required gear.
As an improvement of the above, the second gear selection module includes: a gear setting unit, configured to take the required gear as a target gear if the clutch is not switched to the required gear and the required gear is different from the current gear, take a different gear which is close to the required gear and is in the range of the current gear and the required gear as a target gear if the clutch is not switched to the required gear and the required gear is different from the current gear and is different from the current gear, take a neutral gear as a target gear if the clutch is switched to the required gear and the clutch pressure of the uncontrolled shaft is lower than a half-junction point, and take a preselected gear as a target gear; and the second gear selection unit is used for carrying out gear engagement processing according to the target gear and the combined gear.
As an improvement of the above, the third gear selection module includes: the gear judging unit is used for judging whether the preselected gear is coaxial with the current gear, if so, taking the different-axis gear close to the preselected gear as a target gear, and if not, taking the preselected gear as the target gear; and the third gear selection unit is used for carrying out gear engagement processing according to the target gear and the combined gear.
Correspondingly, the invention also provides computer equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and the computer equipment is characterized in that the processor realizes the steps of the double-clutch transmission gear selection method when executing the computer program.
The implementation of the invention has the following beneficial effects:
the gear selection method of the dual clutch transmission can rapidly select available gears based on the preselected gear, the required gear, the current gear and the fault information, so that the transmission can still shift gears normally as much as possible even if the transmission fails;
furthermore, in the gear shifting and speed regulating stage, when the pressure of the uncontrolled shaft clutch is lower than the half-engagement point, the control of continuous and rapid gear shifting working conditions is facilitated by responding to the preselected gear, the gear shifting delay caused by the action of a gear shifting process executor is reduced, and the requirements of a driver are better met.
Drawings
FIG. 1 is a flow chart of an embodiment of a dual clutch transmission gear selection method of the present invention;
FIG. 2 is a flow chart of an embodiment of gear selection according to fault information in the present invention;
FIG. 3 is a flow chart of an embodiment of gear selection according to the shift state and the relationship between the desired gear and the current gear in the present invention;
FIG. 4 is a flow chart of an embodiment of gear selection according to the relationship of a preselected gear to a current gear in the present invention;
FIG. 5 is a schematic illustration of the power upshift 1-2, the speed adjustment stage taking 1 gear out of gear and 3 gears in the present invention;
FIG. 6 is a schematic structural view of a first embodiment of a dual clutch transmission gear selection system of the present invention;
FIG. 7 is a schematic structural view of a second embodiment of a dual clutch transmission gear selection system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Typically, a dual clutch transmission has one shaft that is a controlled shaft, and the other shaft that is an uncontrolled shaft, where the controlled shaft refers to the clutch shaft that is currently transmitting torque and the uncontrolled shaft refers to the clutch shaft that is not transmitting torque. The decision on the gear during the shifting process is actually to select a gear on the uncontrolled shaft that best meets the driver's expectations, and shift the gear.
Referring to FIG. 1, FIG. 1 shows a flowchart of an embodiment of a dual clutch transmission gear selection method of the present invention, comprising:
s101, judging whether a gear fault exists currently according to the gear fault information.
Judging whether a gear failure exists currently according to the gear failure information, if so, directly entering step S102, otherwise, entering step S103.
S102, when a gear failure exists, gear selection is performed according to failure information.
And S103, when no gear fault exists, judging whether a gear shifting requirement exists currently according to the required gear and the current gear.
And judging whether a gear shifting requirement exists at present according to the required gear and the current gear searched by the gear shifting rule through comparison, if so, directly entering a step S104, otherwise, entering a step S105.
And S104, when a gear shifting requirement exists, selecting a gear according to the switching state and the relation between the required gear and the current gear.
S105, when no gear shifting requirement exists, gear selection is carried out according to the relation between the preselected gear and the current gear.
It should be noted that, in the existing dual clutch transmission, a shift point is obtained by looking up a calibrated shift line (i.e. a shift rule), and a preselected shift point is obtained by correcting the shift point based on acceleration and the like, and gear picking and engagement are performed in advance, so that gear switching is realized at the set shift point. Unlike the prior art, the invention provides a dual clutch transmission gear selection method based on current gear, required gear, preselected gear and fault information for the situation that two input shafts exist in the dual clutch transmission.
Referring to fig. 2, fig. 2 shows a flowchart of an embodiment of gear selection according to fault information in the present invention, which includes:
s201, judging whether the fault type of the gear fault is a stuck gear fault; if the fault type is a stuck gear fault, limiting a maximum available gear according to the stuck gear; and if the fault type is not a stuck gear fault, taking the maximum gear as the maximum available gear.
Specifically, the step of defining the maximum available gear according to the stuck gear comprises:
(1) Defining a required gear speed ratio according to a formula n > (x multiplied by m/y), wherein n is the required gear speed ratio, x is the clutch rotating speed of the transmission in a gear state after gear shifting, m is the speed ratio of the current gear, and y is the highest rotating speed allowed by the clutch;
(2) The maximum available gear is defined according to the desired gear ratio.
When there is a gear failure, if the failure type of the gear failure is a gear stuck failure, it is necessary to limit the range of the required gear in order to prevent vibration and noise caused by the excessive rotation speed of the shaft clutch in which the stuck gear is located. Specifically, the speed ratio of the current gear may be set to be m, the required gear speed ratio is n, the maximum allowable rotation speed of the clutch is y (e.g., 9000 rpm), the clutch rotation speed of the transmission in a steady state after shifting is x (the rotation speed is a rotation speed value that can be achieved by a common steady state in-gear engine after shifting of the transmission, and engine noise is not obvious at the rotation speed, e.g., 3000 rpm). At this time, if a required gear is shifted, the current gear clutch rotational speed after the steady state is shifted is (x/n×m), and considering factors such as vibration noise, the current gear clutch rotational speed needs to be satisfied to be lower than the highest allowable rotational speed of the clutch, that is, the (x/n×m) < y needs to be satisfied, and n > (x×m/y) is further obtained; that is, if a shift hunting fault occurs, the speed ratio of the required shift should be greater than (x/n×m) to avoid vibration noise under normal conditions. In actual engineering, after the available gear range under the jamming fault is calculated based on the required gear speed ratio, the gear range value is further required to be calibrated and adjusted by a real vehicle.
In addition, if the fault type is other faults except for the stuck gear fault, the maximum gear limit gear range value is used, and the maximum gear is used as the maximum available gear.
S202, selecting gears according to the required gears, the current gears and the maximum available gears, wherein:
and if the required gear is larger than the maximum available gear, taking the maximum available gear as the required gear and not responding to the required gear. Specifically, if the required gear found according to the gear shifting rule exceeds the limit range (i.e., the required gear is greater than the maximum available gear), the required gear is not responded, so that the purpose of protecting the transmission is achieved. For example, when 1 st gear is stuck, the maximum available gear is 2 nd, and if the demanded gear is 3 rd, the shift demand will not be responded to.
And if the required gear is not greater than the maximum available gear and the current gear is different from the required gear, performing different-shaft gear shifting.
And if the required gear is not greater than the maximum available gear and the current gear is coaxial with the required gear, performing two different-shaft gear shifts.
It should be noted that if the required gear found according to the gear shifting rule does not exceed the limit range (i.e., the required gear is not greater than the maximum available gear), and the current gear is coaxial with the required gear, at this time, the coaxial gear shifting is split into two different-axis gear shifting. Specifically: firstly, selecting an available different-axis gear which is positioned between a current gear and a required gear and is closest to the required gear as a transition gear; then entering into a different-axis logic for judgment; otherwise, power interruption gear shifting is carried out, the current gear is required to be not stuck when the power interruption gear shifting is carried out, and the gear engaging fault does not exist in the required gear.
Further, the step of shifting the gear by the different shaft comprises the following steps:
(1) And if the fault gear is only on the shaft of the current gear, the required gear is engaged.
Specifically, if the required gear found according to the gear shifting rule does not exceed the limit range (namely, the required gear is not greater than the maximum available gear), and the current gear is different from the required gear in shaft, if the fault gear is only on the shaft where the current gear is located, the gear shifting is not affected, and the required gear is hung.
(2) If the fault gear is not only located on the shaft of the current gear, but also the shaft of the required gear has a clamping stagnation fault, the gear is not required to be taken off.
Specifically, if the required gear found according to the gear shifting rule does not exceed the limit range (namely, the required gear is not greater than the maximum available gear), and the current gear is different from the required gear, if the shaft of the required gear has a clamping failure and the clamping gear is the required gear, then the gear is not required to be taken off at the moment, and gear shifting is allowed.
(3) If the fault gear is not only located on the shaft of the current gear, but also the shaft of the required gear has a non-jamming gear fault, and the fault gear is not the required gear, the required gear is engaged.
Specifically, if the required gear found according to the gear shifting rule does not exceed the limiting range (namely, the required gear is not greater than the maximum available gear), and the current gear is different from the required gear, if at the moment, a non-jamming gear fault exists on the shaft of the required gear, and the fault gear is the non-required gear, the required gear is directly hung for gear shifting.
(4) If the fault gear is not only located on the shaft of the current gear, but also the shaft of the required gear has a non-jamming gear fault, and the fault gear is the required gear, the gear shifting is abandoned.
Specifically, if the required gear found according to the gear shifting rule does not exceed the limit range (namely, the required gear is not greater than the maximum available gear), and the current gear is different from the required gear, if at the moment, a non-jamming gear fault exists on the shaft where the required gear is located, and the fault gear is the non-required gear, the gear shifting is abandoned.
According to the method, when a gear fault exists, if the transmission has a gear jamming fault, in order to prevent the shaft clutch with the jamming gear from being too high in rotating speed, the range of the required gear is limited firstly, namely, if the gear-shifting rule is that the required gear exceeds the limit range, the required gear cannot be responded, so that the purpose of protecting the transmission is achieved; when a gear fault exists but the gear range does not exceed the limit range, if the fault gear is positioned on the shaft of the current gear, the gear shifting is not influenced, and the required gear is directly engaged; if the fault gear is located on the shaft of the required gear, if the clamping failure exists on the shaft of the required gear and the clamping gear is the required gear, the gear is not required to be taken off at the moment, and gear shifting is allowed; if the demand gear shaft has a non-jamming gear failure and the failure gear is a non-demand gear, the demand gear is directly engaged to shift gears.
Referring to fig. 3, fig. 3 shows a flowchart of an embodiment of gear selection according to the relation between the shift state and the required gear and the current gear, which includes:
s301, setting a target gear according to the switching state and the relation between the required gear and the current gear, wherein:
if the clutch is not switched to the required gear and the required gear is different from the current gear, taking the required gear as a target gear;
if the clutch is not switched to the required gear and the required gear is coaxial with the current gear, taking an off-axis gear which is close to the required gear and is in the range of the current gear and the required gear as a target gear;
if the clutch is not switched to the required gear and the required gear is not coaxial with the current gear, taking the neutral gear as a target gear;
when there is a shift request, the requested gear is preferentially used before the clutch is shifted to the requested gear (i.e., the clutch is not shifted to the requested gear). Specifically: if the required gear and the current gear are different, the gear-in target gear is equal to the required gear; if the desired gear is coaxial with the current gear, then the gear on the uncontrolled shaft closest to the desired gear and within the current gear and desired gear range is selected as the target gear (i.e., the off-axis gear that is near the desired gear and within the current gear and desired gear range is selected as the target gear), e.g., a coaxial downshift 5-3, a 4-gear on the uncontrolled shaft during 5-4, and a 3-gear on the uncontrolled shaft target gear after the clutch is shifted to 4-gear. If the desired gear and the current gear are neither off-axis nor on-axis, then neutral is taken as the target gear.
And if the clutch is switched to the required gear and the uncontrolled shaft clutch pressure is lower than the half-engagement point, taking the preselected gear as the target gear.
It is to be noted that, when there is a shift demand, after the clutch is shifted to the demanded gear (i.e., the clutch has been shifted to the demanded gear), if the uncontrolled shaft clutch pressure at this time is lower than KP Point (Kiss Point), the preselected gear is used as the target gear. This is mainly to take into account that the speed of the next gear shift can be increased, for example, the preselected gear has been shifted 3 gears in the speed regulation stage of the power upshift 1-2, at this time the odd clutch pressure has been lower than the KP point, at this time the preselected gear 3 gears are directly responded, the odd shaft is shifted 1 gear to 3 gears, after the current 1-2 speed regulation is finished, the clutch can immediately start the 2-3 gear shift action, so that the shift-out time is saved, and the gear shift is more favorably realized at the set gear shift point (see fig. 5). The gear shifting operation is carried out in the speed regulation stage, and the preselected gear is engaged in advance, so that the gear shifting speed is increased, and the problem of slow gear shifting is effectively solved.
S302, gear shifting is carried out according to the target gear and the combined gear.
Specifically, the step of performing the gear shift process according to the target gear and the combined gear includes:
(1) Determining whether there is a coupling gear on the uncontrolled shaft,
(2) If the combined gear is not present on the uncontrolled shaft, the target gear is engaged,
(3) If the combined gear exists on the uncontrolled shaft and the combined gear is not the target gear, the combined gear is taken off and the target gear is hung,
(4) If the combined gear exists on the uncontrolled shaft and the combined gear is the target gear, no gear is engaged.
In summary, after a target gear is selected, if a combined gear exists on the shaft, if the combined gear is not equal to the target gear, firstly, the combined gear is taken off, and then, the gear is engaged; if the combined gear is equal to the target gear, the gear is not required to be taken off; if there is no engaged gear on the shaft, then the gear is directly engaged.
As can be seen from the above, when there is a shift demand, the demand gear is preferentially used before the clutch is shifted to the demand gear; if the required gear is different from the current gear, selecting the required gear; if the required gear is coaxial with the current gear, selecting the gear which is closest to the required gear on the other shaft and is in the range of the current gear and the required gear; if the speed regulation stage is currently in gear shifting and the clutch pressure of the other shaft is lower than the KP point, the uncontrolled shaft is controlled according to the steady-state gear-in working condition (namely, the speed regulation stage allows the gear of the uncontrolled shaft to be taken off and hung), wherein the gear is taken off and hung in advance in the speed regulation stage, so that the gear shifting speed is increased, and the problem of slow gear shifting under the continuous gear shifting working condition is effectively solved.
Referring to fig. 4, fig. 4 shows a flowchart of an embodiment of gear selection according to the relationship of a preselected gear to a current gear in the present invention, comprising:
s401, judging whether the preselected gear is coaxial with the current gear, if so, taking the gear close to the preselected gear as a target gear, and if not, taking the preselected gear as the target gear.
Specifically, the step of taking the off-axis gear close to the preselected gear as the target gear includes:
(1) If the preselected gear is equal to the current gear, taking the neutral gear as a target gear;
(2) If the preselected gear is greater than the current gear, taking the last gear of the preselected gear on the uncontrolled shaft as a target gear;
(3) And if the preselected gear is smaller than the current gear, taking the next gear of the preselected gear on the uncontrolled shaft as the target gear.
It should be noted that if the preselected gear is coaxial with the current gear, at this time, since the torque is transmitted by the gear on the current gear shaft, the gear cannot be directly used, and it is necessary to select an off-axis gear close to the gear as the target gear. Specifically: if the preselected gear is greater than the current gear, the gear corresponding to the preselected gear-1 is hung on the uncontrolled shaft, and if the preselected gear is less than the current gear, the gear corresponding to the preselected gear +1 is hung on the uncontrolled shaft.
S402, performing gear shifting processing according to the target gear and the combined gear.
Specifically, the step of performing the gear shift process according to the target gear and the combined gear includes:
(1) Determining whether there is a coupling gear on the uncontrolled shaft,
(2) If the combined gear is not present on the uncontrolled shaft, the target gear is engaged,
(3) If the combined gear exists on the uncontrolled shaft and the combined gear is not the target gear, the combined gear is taken off and the target gear is hung,
(4) If the combined gear exists on the uncontrolled shaft and the combined gear is the target gear, no gear is engaged.
Therefore, when the steady state is in the gear working condition, if the preselected gear is different from the current gear and the combined gear does not exist on the uncontrolled shaft, the gear is directly engaged with the target gear; if the combination gear exists on the uncontrolled shaft and the combination gear is not equal to the demand gear, firstly picking up the combination gear, and then engaging the target gear; the required gear is an uncontrolled shaft coupling gear without the need for unhooking.
The method has the advantages that under the non-gear shifting working condition, the preselected gear is preferentially responded; if the preselected gear is different from the current gear, directly selecting the preselected gear; if the preselected gear is coaxial with the current gear, then the gear cannot be used directly because there is already a gear on the current gear shaft to transmit torque, and a gear close to its off-axis needs to be selected as the target gear.
In summary, the gear selection method of the dual clutch transmission can select available gears based on the preselected gear, the required gear, the current gear and the fault information, so that the transmission can still shift as normally as possible even if in fault; meanwhile, the invention provides that when the clutch pressure of the uncontrolled shaft in the gear shifting and speed regulating stage is lower than the KP point, the preselected gear is responded, so that the control of continuous and rapid gear shifting working conditions is facilitated, the gear shifting delay caused by the action of a gear shifting process executor is reduced, and the requirements of a driver are better met.
Referring to fig. 6, fig. 6 shows a specific configuration of a dual clutch transmission range selection system 100 of the present invention, comprising:
the fault judging module 1 is used for judging whether a gear fault exists currently according to the gear fault information.
And the first gear selection module 2 is used for selecting gears according to the fault information when the fault judgment module judges that the gear fault exists currently.
And the demand judging module 3 is used for judging whether a gear shifting demand exists currently according to the demand gear and the current gear when the fault judging module judges that the gear fault does not exist currently.
And the second gear selection module 4 is used for selecting gears according to the switching state and the relation between the required gears and the current gears when the requirement judgment module judges that the gear shifting requirement exists currently.
And the third gear selection module 5 is used for selecting gears according to the relation between the preselected gear and the current gear when the requirement judgment module judges that the gear shifting requirement does not exist currently.
Therefore, the invention provides a gear selection system of the dual clutch transmission based on the current gear, the required gear, the preselected gear and fault information aiming at the condition that two input shafts exist in the dual clutch transmission.
As shown in fig. 7, the first gear selection module 2 includes:
the range setting unit 21 is configured to determine whether the fault type of the gear fault is a stuck gear fault, if the fault type is a stuck gear fault, define a maximum available gear according to the stuck gear, and if the fault type is not a stuck gear fault, take the maximum gear as the maximum available gear. Specifically, when the range setting unit 21 defines the maximum available gear according to the stuck gear, the required gear speed ratio is defined according to the formula n > (x×m/y), and then the maximum available gear is defined according to the required gear speed ratio, where n is the required gear speed ratio, x is the clutch rotational speed of the transmission in the gear steady state after shifting, m is the speed ratio of the current gear, and y is the maximum rotational speed allowed by the clutch.
A first gear selection unit 22 for taking the maximum available gear as the required gear and not responding to the required gear if the required gear is greater than the maximum available gear; if the required gear is not greater than the maximum available gear and the current gear is different from the required gear in axis, carrying out different-axis gear shifting; and if the required gear is not greater than the maximum available gear and the current gear is coaxial with the required gear, performing two different-shaft gear shifts.
Therefore, when a gear failure exists, if the transmission has a gear jamming failure, in order to prevent the shaft clutch with the jamming gear from being too high in rotating speed, the range of the required gear needs to be limited firstly, namely, if the gear is required to exceed the limiting range according to the gear shifting rule, the required gear cannot be responded, so that the purpose of protecting the transmission is achieved; when a gear fault exists but the gear range does not exceed the limit range, if the fault gear is positioned on the shaft of the current gear, the gear shifting is not influenced, and the required gear is directly engaged; if the fault gear is located on the shaft of the required gear, if the clamping failure exists on the shaft of the required gear and the clamping gear is the required gear, the gear is not required to be taken off at the moment, and gear shifting is allowed; if the demand gear shaft has a non-jamming gear failure and the failure gear is a non-demand gear, the demand gear is directly engaged to shift gears.
Meanwhile, the second gear selection module 4 includes:
a gear setting unit 41, configured to take the required gear as a target gear if the clutch is not switched to the required gear and the required gear is different from the current gear; if the clutch is not switched to the required gear and the required gear is coaxial with the current gear, taking an off-axis gear which is close to the required gear and is in the range of the current gear and the required gear as a target gear; if the clutch is not switched to the required gear, and the required gear and the current gear are not different in shaft and coaxial, taking the neutral gear as a target gear; and if the clutch is switched to the required gear and the uncontrolled shaft clutch pressure is lower than a half-engagement point, taking the preselected gear as a target gear.
And a second gear selecting unit 42 for performing a gear engagement process according to the target gear and the combined gear.
Therefore, when there is a shift demand, the demand gear is preferentially used before the clutch is shifted to the demand gear; if the required gear is different from the current gear, selecting the required gear; if the required gear is coaxial with the current gear, selecting the gear which is closest to the required gear on the other shaft and is in the range of the current gear and the required gear; if the speed regulation stage is currently in gear shifting and the clutch pressure of the other shaft is lower than the KP point (namely, the half-combining point), the uncontrolled shaft is controlled according to the steady-state gear working condition (namely, the speed regulation stage allows the gear of the uncontrolled shaft to be taken off and hung), wherein the gear is taken off and hung in advance in the speed regulation stage, the gear shifting speed is increased, and the problem of slow gear shifting under the continuous gear shifting working condition is effectively solved.
In addition, the third gear selection module 5 includes:
a gear determining unit 51 for determining whether the preselected gear is coaxial with the current gear; when the gear is judged to be the target gear, taking the different-axis gear close to the preselected gear as the target gear; and if not, taking the preselected gear as a target gear.
And a third gear selecting unit 52 for performing a gear engagement process according to the target gear and the combined gear.
Therefore, under non-shift conditions, the preselected gear is preferentially responded; if the preselected gear is different from the current gear, directly selecting the preselected gear; if the preselected gear is coaxial with the current gear, then the gear cannot be used directly because there is already a gear on the current gear shaft to transmit torque, and a gear close to its off-axis needs to be selected as the target gear.
In summary, the gear selection system of the dual clutch transmission can select available gears based on the preselected gear, the required gear, the current gear and the fault information, so that the transmission can still shift as normally as possible even if the transmission fails; meanwhile, the invention provides that when the clutch pressure of the uncontrolled shaft in the gear shifting and speed regulating stage is lower than the KP point, the preselected gear is responded, so that the control of continuous and rapid gear shifting working conditions is facilitated, the gear shifting delay caused by the action of a gear shifting process executor is reduced, and the requirements of a driver are better met.
Correspondingly, the invention also discloses computer equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the double-clutch transmission gear selection method when executing the computer program.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (10)
1. A dual clutch transmission gear selection method, comprising:
judging whether a gear fault exists currently according to the gear fault information;
when gear faults exist, gear selection is carried out according to fault information;
when no gear failure exists, judging whether a gear shifting requirement exists currently according to the required gear and the current gear;
when a gear shifting requirement exists, gear selection is carried out according to the switching state and the relation between the required gear and the current gear;
when no gear shifting requirement exists, gear selection is carried out according to the relation between the preselected gear and the current gear;
the step of selecting the gear according to the fault information comprises the following steps:
judging whether the failure type of the gear failure is a stuck gear failure,
if the fault type is a stuck gear fault, limiting the maximum available gear according to the stuck gear, wherein the step of limiting the maximum available gear according to the stuck gear comprises the following steps: defining a required gear speed ratio according to a formula n > (x multiplied by m/y), wherein n is the required gear speed ratio, x is the clutch rotating speed of the transmission in a gear state after gear shifting, m is the speed ratio of the current gear, and y is the highest rotating speed allowed by the clutch; defining a maximum available gear according to the required gear speed ratio;
if the fault type is not a stuck gear fault, taking the maximum gear as the maximum available gear;
selecting a gear according to the required gear, the current gear and the maximum available gear, wherein,
if the required gear is greater than the maximum available gear, the maximum available gear is taken as the required gear and is not responded to the required gear,
if the required gear is not greater than the maximum available gear and the current gear is different from the required gear, the gear is shifted in a different way,
and if the required gear is not greater than the maximum available gear and the current gear is coaxial with the required gear, performing two different-shaft gear shifts.
2. The dual clutch transmission gear selection method of claim 1, wherein the step of shifting the differential shaft includes:
if the fault gear is only on the shaft of the current gear, the required gear is hung;
if the fault gear is not only located on the shaft of the current gear, but also has a clamping stagnation fault on the shaft of the required gear, the gear is not required to be taken off;
if the fault gear is not only located on the shaft of the current gear, and a non-jamming gear fault exists on the shaft of the required gear, and the fault gear is not the required gear, the required gear is hung;
and if the fault gear is not only located on the shaft of the current gear, but also the shaft of the required gear has a non-jamming gear fault, and the fault gear is the required gear, the gear shifting is abandoned.
3. The dual clutch transmission gear selection method as set forth in claim 1, wherein said step of selecting a gear based on a shift state and a relation of a required gear to a current gear includes:
setting a target gear according to the relation between the switching state and the required gear and the current gear, wherein,
if the clutch is not switched to the required gear and the required gear is different from the current gear, taking the required gear as a target gear,
if the clutch is not switched to the required gear and the required gear is coaxial with the current gear, taking the different-axis gear which is close to the required gear and is in the range of the current gear and the required gear as a target gear,
if the clutch is not switched to the required gear, and the required gear is not coaxial with the current gear, taking the neutral gear as the target gear,
if the clutch is switched to the required gear and the uncontrolled shaft clutch pressure is lower than the half-engagement point, taking the preselected gear as a target gear;
and carrying out gear shifting treatment according to the target gear and the combined gear.
4. The dual clutch transmission gear selection method as set forth in claim 1, wherein said step of selecting a gear based on a relationship of a preselected gear to a current gear comprises:
judging whether the preselected gear is coaxial with the current gear,
when the judgment is yes, taking the different-axis gear close to the preselected gear as a target gear,
if not, taking the preselected gear as a target gear;
and carrying out gear shifting treatment according to the target gear and the combined gear.
5. A dual clutch transmission gear selection method as claimed in claim 4 or 3, wherein said step of engaging a gear according to a target gear and a combined gear comprises:
determining whether there is a coupling gear on the uncontrolled shaft,
if no combined gear exists on the uncontrolled shaft, the target gear is hung,
if the combined gear exists on the uncontrolled shaft and the combined gear is not the target gear, the combined gear is taken off and the target gear is hung,
and if the combined gear exists on the uncontrolled shaft and the combined gear is the target gear, not engaging the gear.
6. The dual clutch transmission gear selection method as set forth in claim 4, wherein said step of taking as a target gear a gear that is off-axis from a preselected gear comprises:
if the preselected gear is equal to the current gear, taking the neutral gear as a target gear;
if the preselected gear is greater than the current gear, taking the last gear of the preselected gear on the uncontrolled shaft as a target gear;
and if the preselected gear is smaller than the current gear, taking the next gear of the preselected gear on the uncontrolled shaft as a target gear.
7. A dual clutch transmission gear selection system, comprising:
the fault judging module is used for judging whether a gear fault exists currently according to the gear fault information;
the first gear selection module is used for selecting gears according to the fault information when the fault judgment module judges that the gear fault exists currently;
the demand judging module is used for judging whether a gear shifting demand exists currently according to the demand gear and the current gear when the fault judging module judges that the gear fault does not exist currently;
the second gear selection module is used for selecting gears according to the switching state and the relation between the required gears and the current gears when the requirement judgment module judges that the gear shifting requirement exists currently;
the third gear selection module is used for selecting gears according to the relation between the preselected gear and the current gear when the requirement judgment module judges that the gear shifting requirement does not exist currently;
the first gear selection module includes:
the range setting unit is used for judging whether the fault type of the gear fault is a stuck gear fault, if the fault type is a stuck gear fault, limiting the maximum available gear according to the stuck gear, and if the fault type is not the stuck gear fault, taking the maximum gear as the maximum available gear; when the range setting unit limits the maximum available gear according to the clamping stagnation gear, a required gear speed ratio is limited according to a formula n > (x multiplied by m/y), and then the maximum available gear is limited according to the required gear speed ratio, wherein n is the required gear speed ratio, x is the clutch rotating speed of the transmission in the gear steady state after gear shifting, m is the speed ratio of the current gear, and y is the highest allowable rotating speed of the clutch;
the first gear selecting unit is used for taking the maximum available gear as the required gear and not responding to the required gear if the required gear is larger than the maximum available gear, shifting the gear by different shafts if the required gear is not larger than the maximum available gear and the current gear is different from the required gear, and shifting the gear by different shafts twice if the required gear is not larger than the maximum available gear and the current gear is coaxial with the required gear.
8. The dual clutch transmission gear selection system of claim 7, wherein the second gear selection module comprises:
a gear setting unit, configured to take the required gear as a target gear if the clutch is not switched to the required gear and the required gear is different from the current gear, take a different gear close to the required gear and within the range of the current gear and the required gear as a target gear if the clutch is not switched to the required gear and the current gear is coaxial with the current gear, and take a preselected gear as a target gear if the clutch is not switched to the required gear and the required gear is neither different from the current gear nor coaxial with the current gear, and take a neutral gear as a target gear if the clutch is switched to the required gear and the clutch pressure of the uncontrolled shaft is lower than a half-junction point;
and the second gear selection unit is used for carrying out gear engagement processing according to the target gear and the combined gear.
9. The dual clutch transmission gear selection system of claim 7, wherein the third gear selection module comprises:
the gear judging unit is used for judging whether the preselected gear is coaxial with the current gear, if so, taking the different-axis gear close to the preselected gear as a target gear, and if not, taking the preselected gear as the target gear;
and the third gear selection unit is used for carrying out gear engagement processing according to the target gear and the combined gear.
10. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
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