CN108302193B - Positive torque downshift method - Google Patents
Positive torque downshift method Download PDFInfo
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- CN108302193B CN108302193B CN201710411447.1A CN201710411447A CN108302193B CN 108302193 B CN108302193 B CN 108302193B CN 201710411447 A CN201710411447 A CN 201710411447A CN 108302193 B CN108302193 B CN 108302193B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
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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
- F16H59/14—Inputs being a function of torque or torque demand
- F16H59/24—Inputs being a function of torque or torque demand dependent on the throttle opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H2061/0474—Smoothing ratio shift by smoothing engagement or release of positive clutches; Methods or means for shock free engagement of dog clutches
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- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention provides a positive torque downshift method, which is applicable to an electric vehicle pneumatic shift system with at least two clutches controlled by a control unit and comprises the steps of entering a positive torque downshift mode at zero time, closing a passage of a reversing valve communicated with a second cylinder, opening a passage communicated with a first cylinder, setting a straight-through valve at a low level, and keeping the torque of a driving motor constant to be an accelerator pedal value; setting the straight-through valve at a high level at a first preset moment, increasing the torque of the driving motor to a first preset value, receiving and judging whether a rotating speed signal output by the gearbox reaches a second preset value by the control unit, entering the next stage, and otherwise, not entering; the problem of electric automobile shift is solved.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a positive torque downshift method of a pneumatic gear shifting system of a pure electric vehicle.
Background
Compared with a hybrid electric vehicle and a fuel cell vehicle, the pure electric vehicle has the advantages that a motor replaces a fuel engine, the noise is low, the pollution is avoided, and the space and the weight occupied by the motor, an oil tank and a transmission system are less and can be used for compensating the requirement of a battery; and because of using the single electric energy, the electric control system is greatly simplified compared with the hybrid electric vehicle, the electric vehicle has simple structure, less running and transmission parts and less maintenance workload compared with the internal combustion engine vehicle; the pure electric vehicle saves an oil tank, an engine, a cooling system and an exhaust system, and compared with an internal combustion gasoline engine power system of a traditional vehicle, the pure electric vehicle is higher in energy conversion efficiency and is a development direction for vigorous popularization.
At present, a single-stage reduction gearbox is only assembled on the transmission part of most electric vehicles, so that the electric motor is operated at a critical point for a long time, and the efficiency of power output is reduced; the single-stage reduction gearbox is not beneficial to the economy and comfort of the vehicle, and the single-stage reduction gearbox generally adopts a large reduction ratio, so that the vehicle is in a high rotating speed critical point for a long time, and the economy is not high; the multi-gear gearbox is smaller than the loss of a fixed gear to power output, the power output efficiency of the motor can be greatly improved, if the multi-gear gearbox with a reasonable speed ratio range can be matched, the power output characteristic of the motor is optimized, the economy and the power performance can be greatly improved, the battery loss is reduced, and the cruising mileage of the battery is increased. The technical difficulty of the automatic gearbox is the shift impact and the power interruption of the multi-gear automatic gearbox.
Disclosure of Invention
The invention aims to solve the technical problem of gear shifting of an electric automobile.
the invention provides a positive torque downshift method, which is applicable to an electric vehicle pneumatic gear shifting system with at least two clutches controlled by a control unit and comprises the steps of entering a positive torque downshift mode at zero time, closing a passage of a reversing valve communicated with a second cylinder, opening a passage communicated with a first cylinder, setting a straight-through valve at a low level, and keeping the torque of a driving motor constant to be an accelerator pedal value; setting the straight-through valve at a high level at a first preset moment, increasing the torque of the driving motor to a first preset value, receiving and judging whether a rotating speed signal output by the gearbox reaches a second preset value by the control unit, entering the next stage, and otherwise, not entering; at a second preset moment, modulating the PWM pulse width of the direct-through valve, and keeping the torque of the driving motor constant to a third preset value; at a third preset moment, setting the straight-through valve at a low level, reducing the torque of the driving motor to a fourth preset value, receiving and judging whether the rotating speed signal reaches a fifth preset value by the control unit, and entering the next stage if the rotating speed signal reaches the fifth preset value; at a fourth preset moment, performing pulse width modulation on the direct-current valve PWM, and increasing the torque of the driving motor to a sixth preset value; and at the fifth preset moment, setting the straight-through valve to be at a high level, and finishing gear shifting.
Specifically, the first preset value is 80-120 Nm.
Specifically, the second preset value is 1600r/min-2000 r/min.
Specifically, the third preset value is 300Nm to 500 Nm.
Preferably, the fourth preset value is 80Nm to 120 Nm.
Further, the fifth preset value is set to be 2200r/min-2600 r/min.
Specifically, the sixth preset value is an accelerator pedal value.
Specifically, the duty ratio at the time of pulse width modulation of the direct valve is set to 20%.
Preferably, the time interval among the zero time, the first preset time, the second preset time, the third preset time, the fourth preset time and the fifth preset time is 3:1:3:6: 4.
The invention has the following advantages: a series of operations such as torque conversion, straight-through valve pressure follow-up and the like are carried out timely, so that the power output felt by a user can not jump off, and the strong impact feeling can not be realized, the comfort of passengers is improved, meanwhile, the sufficient power output is realized, and the practical effect is good.
Drawings
FIG. 1 is a schematic diagram of a full electric vehicle shift system according to the present invention;
FIG. 2 is a schematic illustration of a positive torque upshift method parameter transformation of the present invention;
FIG. 3 is a flowchart of a positive torque upshift method of the present invention;
FIG. 4 is a schematic illustration of a negative torque downshift method parameter transformation according to the present invention;
FIG. 5 is a flowchart of a negative torque downshift method of the present invention;
FIG. 6 is a schematic illustration of a positive torque downshift method parameter transformation according to the present invention;
FIG. 7 is a flowchart of a positive torque downshift method of the present invention.
Description of reference numerals:
1. A gas source;
2. A filter;
3. A straight-through valve;
4. a muffler;
5. A muffler;
6. a diverter valve;
7. A first cylinder;
8. a second cylinder.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the invention relates to a pure electric vehicle 2-gear automatic transmission gear shifting system, which comprises a control unit, a driving motor and a pressure control loop, wherein the control unit is connected with the driving motor; the pressure control loop comprises a straight-through valve and a reversing valve, the straight-through valve is connected with the reversing valve, and the reversing valve is connected with a plurality of cylinders; each cylinder is connected with one clutch; the driving motor is connected with a vehicle transmission system through a gearbox;
The controller unit is used for receiving vehicle input commands and outputting control commands to the driving motor, the straight-through valve and the reversing valve. In some preferred embodiments, the gear shift system includes a TCU (automatic transmission control unit) first gear clutch, a second gear clutch. And a three-position five-way reversing valve is also selected as a gear selecting electromagnetic valve to execute a gear selecting instruction, and a two-position two-way straight-through valve is also selected as a gear shifting process control valve to control the combination of the clutches. The TCU receives throttle and brake opening signals and outputs rotating speed signals, judges gear shifting time and sends gear shifting control signals to the driving motor and the pressure control loop. The driving motor receives the TCU signal, executes the gear shifting working condition, the pressure control circuit receives the TCU signal, executes the gear shifting logic command, and pushes the cylinder to lock the clutch to complete gear shifting. Through the scheme, the electric vehicle can have enough power output when the torque needs to be switched, and the problem of terminal or impact feeling caused by unstable power output when the torque is switched is avoided. Wherein: 1. the required torque of the driving motor is obtained by calculating the torque capacity of each gear clutch friction plate, and is finally determined after calibration and correction in a laboratory; 2. clutch control pressure C1, C2, gear-shifting delay time t (t 0-t 5), PWM electromagnetic valve pulse width control parameters are obtained by calculating electromagnetic valve CV value (flow coefficient), clutch friction plate free gap, clutch friction plate torque capacity, cylinder pressure-bearing area and other parameters, and are finally determined after laboratory calibration and correction.
In other embodiments, two cylinders are provided and are respectively connected with the reversing valve in a ventilation mode. Of course, the cylinders and the clutches can be arranged into a plurality of groups, and the requirement of multi-gear control is met.
In other embodiments, in order to better supply air to the straight-through valve, the straight-through valve further comprises an air source and a filter, wherein the air source is connected with the inlet end of the filter, and the outlet end of the filter is connected with the straight-through valve. Through the arrangement, the technical effect of better air supply is achieved.
In a preferred embodiment, the reversing valve further comprises a silencer, the silencer is connected with the reversing valve, and the silencer is arranged at the pressure relief end of the reversing valve. When the reversing valve needs to relieve the pressure of the cylinder in the gear shifting process, the silencer can well reduce the working noise of the device, and the problem of overlarge working noise is solved.
In certain embodiments, the method is also applicable to a pneumatic electric vehicle gear shifting system with a reversing valve communicated with a two-gear clutch. The upshift method comprises the steps (see fig. 3): and the TCU judges whether signals such as the accelerator opening, the brake opening, the output rotating speed of the gearbox, the current gear position and the like reach preset values, and enters a positive torque upshift mode. Wherein A is a first clutch passage and is open when the value is 1; b is a second clutch passage, which is open when the value is 1; c is a through valve state, 1 bit is opened, and the percentage is the duty ratio; t is the output torque value of the motor; and n is the rotating speed of the motor. A gear shifting process: (1) and t0, entering a gear shifting mode, and performing the following steps: the reversing valve is arranged at a second working position, namely a passage communicated with the second cylinder is opened, a passage communicated with the first cylinder is closed, and the straight-through valve is arranged at a low level; after the above steps, the first clutch control pressure C1 is rapidly reduced, and the torque value of the driving motor is set to be consistent with the value of the accelerator pedal and is delayed to t 1; (2) at the moment t1, the straight-through valve is set to be at a high level, the control pressure C2 of the second clutch rapidly rises, the torque value is set to be a first preset value, such as 400Nm, and the time is delayed to t 2; (3) at the time of t2, performing through valve PWM pulse width modulation, wherein the duty ratio can be set to 20%, the second clutch control pressure C2 slowly rises, the first clutch slowly disengages, the torque exchange of the first clutch and the second clutch can be realized immediately, the impact feeling in the gear shifting process can be reduced by performing pulse width modulation on the through valve, the driving comfort of a user is improved, and the step is delayed to t 3; (4) at time t3, a step is carried out, the straight-through valve is set to be at a low level, the second clutch control pressure C2 is constant, the torque of the motor is reduced and can be set to be 100Nm, the driving motor provides driving torque, the rotating speed of the motor is rapidly reduced, the TCU carries out a receiving judgment step, when the rotating speed signal n is judged to reach a preset value, such as 1900r/min in some preferred embodiments, the rotating speed exchange is started to be completed, and the next stage is carried out; (5) and at the time t4, the straight-through valve is set to be at a high level, the second clutch control pressure C2 rises rapidly, the torque of the driving motor rises to a preset value in the figure, and the gear shifting is finished. Through the design, when the electric vehicle uses the pneumatic driving system, the boosting and the connection of the second clutch can be realized when the first clutch is about to relieve the pressure, so that the comfortable non-interruption and non-impact gear shifting operation can be realized, and the effect of improving the gear shifting experience of a user is achieved.
In some specific embodiments, the first preset value in the previous example step may be 300Nm, 400Nm, 500Nm, preferably 400Nm, and may be set to 80Nm, 100Nm, or 120Nm, preferably 100Nm when the motor torque is reduced at time t3, and the preset value in the judgment step may be 1700r/min, 1900r/min, or 2100r/min, preferably 1900r/min when the rotation speed signal n is judged to reach the preset value. The embodiment can better perform smooth transition between the first clutch and the second clutch, and achieves the effects of comfortable, interruption-free and impact-free gear shifting. By modifying the preset values and adjusting the torque and the rotation speed at different moments, the electric vehicle can be switched among different gears, such as one gear for two gears, two gears for three gears, three gears for four gears, and the like.
In order to better realize the functions of the pneumatic pure electric gear shifting system, the method also comprises the following characteristics: the time interval ratio between t0 to t1, t0 to t2, t0 to t3, t0 to t4 is 3:4:7: 11. Specifically, the method steps of the change gear shift are carried out from t0, the specific time required during the change gear shift is determined by the through valve actually adopted, the pressure threshold of the reversing valve and the pressure relief speed determined by the valve size, and a reader reading the description can determine the specific value of the time interval according to the actually adopted component characteristics, but in the preferred embodiment, the time interval ratio between t0 to t1, t0 to t2, t0 to t3 and t0 to t4 is 3:4:7:11, namely the time interval ratio between the stages t0 to t1, t1 to t2, t2 to t3 and t3 to t4 is 3:1:3: 4. Through the above process, we can understand that as an optimal implementation mode, only by applying an optimal time interval to the method, the shift system can have reasonable time to perform a series of operations such as first-gear pressure reduction, switching of the reversing valve when the clutch is in light contact, second-gear pressure follow-up, timely torque conversion, straight-through valve pressure follow-up and the like, so that the power output felt by a user can not jump off or have strong impact, the comfort of passengers can be improved, and meanwhile, the method has sufficient power output and has a good practical effect.
the negative torque downshift process is as follows (see fig. 5): and the TCU judges that signals such as the accelerator opening, the brake opening, the output rotating speed of the gearbox, the current gear and the like reach preset values, and enters a negative torque downshift mode. Wherein A is a first clutch passage and is open when the value is 1; b is a second clutch passage, which is open when the value is 1; c is a through valve state, 1 bit is opened, and the percentage is the duty ratio; t is the output torque value of the motor; and n is the rotating speed of the motor. The gear shifting steps are as follows: (1) entering a gear shifting mode at the moment of t0, setting the reversing valve to a first gear working position, namely closing a passage communicated with the second cylinder, opening a passage communicated with the first cylinder, setting the straight-through valve to a low level, quickly reducing the second clutch control pressure C2, keeping the torque of the driving motor constant to be a first preset value, and delaying to t 1; (2) at time t1, the straight-through valve is set to be at a high level, the first clutch control pressure C1 rises rapidly, and the time is delayed to t 2; (3) at the time t2, pulse width modulation is carried out on the direct valve PWM, the first clutch control pressure C1 rises slowly, torque exchange is achieved by the first clutch and the second clutch, and the time is delayed to t 3; (4) at the time of t3, the straight-through valve is set to be at a low level, the first clutch control pressure C1 is constant, the set torque is a second preset value, the rotating speed of the motor is rapidly reduced, the TCU control unit receives and judges that the rotating speed signal n reaches a third preset value, rotating speed exchange is realized, and then the next stage is started; (5) and at the time t4, the straight-through valve is set to be at a high level, the torque is set to be an accelerator pedal value, the first clutch control pressure C1 is rapidly increased, the torque of the driving motor is increased to a working preset value, and the gear shifting is finished.
In some specific embodiments, the first preset value in the previous example step may be 0Nm, 10Nm, 20Nm, and the like, and is preferably 0Nm, the second preset value set at time t3 may be 0Nm, 10Nm, or 20Nm, and is preferably 0Nm, and the determining step may select 2200r/min, 2400r/min, or 2600r/min, and is preferably 2400r/min when determining that the rotation speed signal n reaches the third preset value. The duty ratio when pulse width modulating the dc valve may be set to 20%. The embodiment can better perform smooth transition between the second clutch and the first clutch, and achieves the effects of comfortable, interruption-free and impact-free gear shifting. By modifying the preset value and adjusting the torque and the rotating speed at different moments, the electric vehicle can be switched among different gears, such as a fourth gear and a third gear, a third gear and a second gear, a second gear and a first gear, and the like.
In order to better realize the functions of the pneumatic pure electric gear shifting system, the method also comprises the following characteristics: the time interval ratio between t0 to t1, t0 to t2, t0 to t3, t0 to t4 is 3:4:7: 11. Specifically, the method steps of the change gear shift are carried out from t0, the specific time required during the change gear shift is determined by the through valve actually adopted, the pressure threshold of the reversing valve and the pressure relief speed determined by the valve size, and a reader reading the description can determine the specific value of the time interval according to the actually adopted component characteristics, but in the preferred embodiment, the time interval ratio between t0 to t1, t0 to t2, t0 to t3 and t0 to t4 is 3:4:7:11, namely the time interval ratio between the stages t0 to t1, t1 to t2, t2 to t3 and t3 to t4 is 3:1:3: 4. As can be understood from the above flow, as a preferred embodiment, as shown in fig. 4, only by applying a preferred time interval to the method, it is possible to perform a series of operations such as two-gear pressure reduction, switching of the directional control valve when the clutch is in light contact, first-gear pressure follow-up, timely torque conversion, straight-through valve pressure follow-up, and the like in a shift system for a reasonable time, so that the power output felt by the user will not jump off or have strong impact, and the comfort of the passenger is improved while sufficient power output is achieved, thereby achieving a good practical effect.
The positive torque downshift process is as follows (see fig. 7): and the TCU judges that signals such as the accelerator opening, the brake opening, the output rotating speed of the gearbox, the current gear and the like reach preset values, and enters a positive torque downshift mode. Wherein A is a first clutch passage and is open when the value is 1; b is a second clutch passage, which is open when the value is 1; c is a through valve state, 1 bit is opened, and the percentage is the duty ratio; t is the output torque value of the motor; and n is the rotating speed of the motor. The gear shifting comprises the following steps: (1) entering a positive torque downshift mode at the moment of t0, setting the reversing valve to a first gear working position, namely closing a passage communicated with the second cylinder, opening a passage communicated with the first cylinder, setting the straight-through valve to a low level, rapidly lowering the second clutch control pressure C2 at the moment, keeping the torque of the driving motor constant at an accelerator pedal value, and delaying the time to t 1; (2) and at the moment of t1, the straight-through valve is set to be at a high level, the first clutch control pressure C1 rises rapidly, the torque of the driving motor rises to a first preset value, the control unit receives and judges that the output speed signal of the gearbox reaches a second preset value, the time is delayed to t2, and the next stage is started, otherwise, the next stage is not started. (3) At the moment of t2, modulating the PWM pulse width of the direct-through valve, slowly increasing the control pressure C1 of the first clutch, keeping the torque of the driving motor constant at a third preset value, realizing the rotation speed exchange of the first clutch and the second clutch at the moment, and delaying the rotation speed to t 3; (4) at the time of t3, the straight-through valve is set to be at a low level, the first clutch control pressure C1 is constant, the torque of the driving motor is reduced to a fourth preset value, at the moment, the rotating speed of the motor is slowly reduced, the TCU receives and judges whether a rotating speed signal reaches a fifth preset value, and if yes, the next stage is started; (5) at the time t4, pulse width modulation is carried out on the direct valve PWM, the first clutch control pressure C1 slowly rises, the torque of the driving motor rises to a sixth preset value, and the time is delayed to t 5; (6) at time t5, the straight-through valve is set to a high level, the first clutch control pressure C1 rapidly rises, and the shift is completed.
In some specific embodiments, the first preset value in the previous example step may be 80Nm, 100Nm, 120Nm, etc., preferably 100Nm, and the rotation speed signal reaching the second preset value may be set to 1600r/min, 1800r/min or 2000r/min, preferably 1800 r/min; the third preset value may be 300Nm, 400Nm, 500Nm, etc., preferably 400Nm, and the fourth preset value may be 80Nm, 100Nm, 120Nm, etc., preferably 100 Nm. The fifth preset value can be set to 2200r/min, 2400r/min or 2600r/min, preferably 2400 r/min. The sixth preset value may be set as an accelerator pedal value. The duty ratio when pulse width modulating the dc valve may be set to 20%. The embodiment can better perform smooth transition between the second clutch and the first clutch, and achieves the effects of comfortable, interruption-free and impact-free gear shifting. By modifying the preset value and adjusting the torque and the rotating speed at different moments, the electric vehicle can be switched among different gears, such as a fourth gear and a third gear, a third gear and a second gear, a second gear and a first gear, and the like.
In order to better realize the functions of the pneumatic pure electric gear shifting system, the method also comprises the following characteristics: the time interval ratio between t0 to t1, t0 to t2, t0 to t3, t0 to t4, t0 to t5 is 3:4:7:13: 17. Specifically, the method steps of the change gear shift are carried out starting from t0, the specific time required during the change gear shift is determined by the actually adopted through valve, the pressure threshold of the reversing valve and the pressure relief speed determined by the valve size, and a reader reading the description can determine the specific value of the time interval by determining the time interval according to the actually adopted component characteristics, but in the preferred embodiment, the time interval ratio between t0 to t1, t0 to t2, t0 to t3 and t0 to t4 is 3:4:7:13:17, namely the time interval ratio between the stages t0 to t1, t1 to t2, t2 to t3, t3 to t4 and t4 to t5 is 3:1:3:6: 4. As can be understood from the above flow chart, as a preferred embodiment, it can be seen from fig. 6: only by applying the optimal time interval to the method, the gear shifting system can have reasonable time to perform a series of operations of pressure reduction at the second gear, switching of the reversing valve when the clutch is in slight contact, pressure follow-up at the first gear, timely torque conversion, pressure follow-up of the through valve and the like, so that the power output felt by a user can not jump off or have strong impact, the comfort of passengers can be improved, and meanwhile, the method has enough power output and has good practical effect.
the TCU judges the gear shifting mode through an accelerator, a brake opening signal and an output rotating speed signal. A shift logic command is calculated.
The pressure control circuit of the invention can adopt a pneumatic control circuit and a hydraulic control circuit.
The three-position five-way reversing valve is used as a gear selecting electromagnetic valve to execute a gear selecting instruction, and the two-position two-way straight-through valve is used as a gear shifting process control valve to control the combination of a clutch.
the invention has the beneficial effects that: this patent is through a TCU control logic, control driving motor, pressure control return circuit, and the clutch of shifting is controlled, can realize that pure electric automatic transmission is unpowered, do not have the impact automatic gearshift, and unpowered interruption, do not have the impact and shift and have improved the travelling comfort of vehicle, have prolonged the life of gearbox.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A positive torque downshift method is applicable to an electric vehicle pneumatic gear shifting system with at least two clutches controlled by a control unit, and comprises the control unit, a driving motor and a pressure control loop; the pressure control loop comprises a straight-through valve and a reversing valve, the straight-through valve is connected with the reversing valve, and the reversing valve is connected with a plurality of cylinders; each cylinder is connected with one clutch; the driving motor is connected with a vehicle transmission system through a gearbox, and the method is characterized by comprising the steps of entering a positive torque downshift mode at zero time, closing a passage of a reversing valve communicated with a second cylinder, opening a passage communicated with a first cylinder, setting a straight-through valve at a low level, and keeping the torque of the driving motor constant to be an accelerator pedal value; setting the straight-through valve at a high level at a first preset moment, increasing the torque of the driving motor to a first preset value, receiving and judging whether a rotating speed signal output by the gearbox reaches a second preset value by the control unit, entering the next stage, and otherwise, not entering; at a second preset moment, modulating the PWM pulse width of the direct-through valve, and keeping the torque of the driving motor constant to a third preset value; at a third preset moment, setting the straight-through valve at a low level, reducing the torque of the driving motor to a fourth preset value, receiving and judging whether the rotating speed signal reaches a fifth preset value by the control unit, and entering the next stage if the rotating speed signal reaches the fifth preset value; at a fourth preset moment, performing pulse width modulation on the direct-current valve PWM, and increasing the torque of the driving motor to a sixth preset value; and at the fifth preset moment, setting the straight-through valve to be at a high level, and finishing gear shifting.
2. The positive torque downshift method according to claim 1, wherein the first preset value is 80-120 Nm.
3. The positive torque downshift method according to claim 1, wherein the second predetermined value is 1600-2000 r/min.
4. the positive torque downshift method according to claim 1, wherein the third preset value is 300Nm to 500 Nm.
5. The positive torque downshift method according to claim 1, wherein the fourth preset value is 80Nm to 120 Nm.
6. the positive torque downshift method according to claim 1, wherein the fifth preset value is set to 2200r/min to 2600 r/min.
7. The positive torque downshift method according to claim 1, wherein the sixth preset value is an accelerator pedal value.
8. The positive torque downshift method according to claim 1, wherein the duty cycle at which the direct valve is pulse width modulated is set to 20%.
9. The positive torque downshift method according to claim 1, wherein a time interval between the zero time, the first preset time, the second preset time, the third preset time, the fourth preset time, and the fifth preset time is 3:1:3:6: 4.
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| JP6124938B2 (en) * | 2015-03-31 | 2017-05-10 | 本田技研工業株式会社 | Twin clutch transmission |
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| CN103895640A (en) * | 2014-02-26 | 2014-07-02 | 南京越博汽车电子有限公司 | AMT gear control method of hybrid power automobiles |
| CN204985686U (en) * | 2015-07-27 | 2016-01-20 | 安徽江淮汽车股份有限公司 | A hydraulic control system for hybrid double clutch automatic transmission |
| CN106594265A (en) * | 2016-11-25 | 2017-04-26 | 浙江吉利控股集团有限公司 | Control device and control method of manual transmission clutch |
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