CN112901770A - Self-learning method and system for electromagnetic valve characteristic curve of double-clutch automatic transmission - Google Patents
Self-learning method and system for electromagnetic valve characteristic curve of double-clutch automatic transmission Download PDFInfo
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- CN112901770A CN112901770A CN202110053379.2A CN202110053379A CN112901770A CN 112901770 A CN112901770 A CN 112901770A CN 202110053379 A CN202110053379 A CN 202110053379A CN 112901770 A CN112901770 A CN 112901770A
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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
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
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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
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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
- F16H2061/0075—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 a particular control method
- F16H2061/0087—Adaptive control, e.g. the control parameters adapted by learning
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Abstract
The invention discloses a self-learning method and a system for a solenoid valve characteristic curve of a double-clutch automatic transmission, wherein the self-learning method comprises the following steps: when corresponding conditions are met, self-learning is carried out, and the following steps are executed: requesting all gear shifting forks corresponding to the clutch in the idle state to return to a neutral position; sequentially applying n self-learning currents from small to large to the solenoid valve to be learned to obtain n actual pressure values of the clutch; sequentially applying n-1 self-learning currents from high to low to the electromagnetic valve to be learned to obtain n-1 actual pressure values of the clutch; calculating clutch pressure corresponding to the self-learning current to obtain n clutch pressures; step five, enabling the n self-learning currents to correspond to the n clutch pressures one by one, obtaining and storing electromagnetic valve characteristic curves, and accordingly completing self-learning; in the self-learning process, if the exit condition is met, the self-learning is exited. The invention can realize the accurate control of the pressure of the clutch and avoid influencing the driving comfort of the whole vehicle.
Description
Technical Field
The invention belongs to the field of clutch control, and particularly relates to a self-learning method and a self-learning system for a characteristic curve of an electromagnetic valve of a dual-clutch automatic transmission.
Background
The hydraulic system is a key component of the double-clutch automatic transmission and consists of an oil suction filter, an oil pump, a pressure filter, a hydraulic control module, an oil pipe and the like. The hydraulic system receives a control signal of a transmission control unit (namely TCU), and controls the pressure of an oil way in real time through an electromagnetic valve to realize the control of the pressure of the clutch. The electromagnetic valve characteristic curve of the clutch is a corresponding relation curve of clutch pressure and electromagnetic valve current, and directly influences the control precision of the clutch pressure. The solenoid valve characteristic curve of the existing double-clutch automatic transmission is determined when the transmission is off-line and is stored in a transmission control unit, and the solenoid valve characteristic curve is fixed and unchanged in the whole life cycle of the transmission; however, as the mileage of the vehicle increases, the characteristics of the electromagnetic valve have changed, and if the clutch pressure control is still performed according to the initially stored electromagnetic valve characteristic curve, the problem of inaccurate clutch pressure control exists, so that the driving comfort of the whole vehicle is influenced.
Disclosure of Invention
The invention aims to provide a self-learning method and a self-learning system for a characteristic curve of an electromagnetic valve of a double-clutch automatic transmission, so as to realize accurate control on clutch pressure and avoid influencing the driving comfort of a whole vehicle.
The invention relates to a self-learning method of a characteristic curve of an electromagnetic valve of a double-clutch automatic transmission, which comprises the following steps: when the electromagnetic valve self-learning state is waiting for self-learning and the electromagnetic valve self-learning entering condition is met, the electromagnetic valve characteristic curve is self-learned, and the following steps are executed:
requesting all gear shifting forks corresponding to a clutch in an idle state to return to a neutral position;
step two, sequentially applying n preset self-learning currents I from small to large to the solenoid valve to be learned (namely the solenoid valve corresponding to the clutch in the idle state)1、I2、...、InAcquiring and storing the actual pressure value of the clutch corresponding to each self-learning current to obtain n actual pressure values Pr of the clutch1、Pr2、...、Prn(ii) a Wherein n is an integer and n is not less than 3;
step three, sequentially applying preset electromagnetic valves (corresponding to the clutch in the idle state) to be learnedLarge to small n-1 self-learning currents In-1、In-2、...、I1Acquiring and storing the actual pressure value of the clutch corresponding to each self-learning current to obtain n-1 actual pressure values Pd of the clutchn-1、Pdn-2、...、Pd1；
Step four, leading Pdn=Prn(i.e., Pr)nIs assigned to Pdn) And using the formula: pi=(1-Ki)*Pri+ Ki* PdiCalculating the self-learning current IiCorresponding clutch pressure PiObtaining n clutch pressures P1、P2、...、Pn(ii) a Wherein, KiFor calibrated correction factor, K is more than or equal to 0iLess than or equal to 1, i sequentially taking all integers from 1 to n;
step five, carrying out self-learning on n currents I1、I2、...、InWith n clutch pressures P1、P2、...、PnThe electromagnetic valve characteristic curves are obtained in a one-to-one correspondence mode and stored (namely the stored electromagnetic valve characteristic curves are replaced by the electromagnetic valve characteristic curves, namely the stored electromagnetic valve characteristic curves are updated), so that self-learning is completed;
in the self-learning process, if the self-learning exit condition of the electromagnetic valve is met, the self-learning of the characteristic curve of the electromagnetic valve exits.
Preferably, during self-learning, the self-learning state of the electromagnetic valve is changed into self-learning; when quitting the self-learning of the characteristic curve of the electromagnetic valve, the self-learning state of the electromagnetic valve is changed into a state of waiting for the self-learning; after the self-learning is completed, the solenoid valve self-learning state is changed to be completed.
Preferably, if the conditions 1a to 1f are simultaneously met, the condition that the electromagnetic valve self-learning entering condition is met is judged; wherein,
condition 1a is: the transmission oil temperature is within a preset oil temperature range;
condition 1b is: the rotating speed of the engine is in a preset rotating speed range;
condition 1c is: the engine speed change rate is within a preset speed change rate range;
condition 1d is: the current gear of the transmission is in a preset gear (namely, the vehicle running gear is a gear corresponding to a clutch in a working state);
condition 1e is: the clutch corresponding to the solenoid valve to be learned is in an idle state (namely, no demand is combined, and the requested pressure value is 0);
condition 1f is: the main pressure target pressure of the hydraulic system is within a preset pressure range.
Preferably, if any one of the conditions 2a to 2d is satisfied, it is determined that the solenoid valve self-learning exit condition is satisfied; wherein,
condition 2a is: the oil temperature of the transmission is not in a preset oil temperature range;
condition 2b is: the rotating speed of the engine is not in a preset rotating speed range;
condition 2c is: the main pressure target pressure of the hydraulic system is not in a preset pressure range;
condition 2d is: the clutch corresponding to the self-learning electromagnetic valve has combination requirements.
The self-learning system of the solenoid valve characteristic curve of the dual clutch automatic transmission according to the present invention includes a transmission control unit (i.e., TCU) programmed to perform the above-described self-learning method of the solenoid valve characteristic curve of the dual clutch automatic transmission.
The invention has the following effects:
(1) by adopting the self-learning method and the self-learning system described by the invention, the self-learning of the characteristic curve of the electromagnetic valve can be automatically carried out in the driving process of the vehicle, so that the characteristic curve of the electromagnetic valve better meets the requirement of the current clutch, the accurate control of the pressure of the clutch is realized, the influence on the driving comfort of the whole vehicle is avoided, and the driving performance of the whole vehicle in the whole life cycle is ensured.
(2) In the self-learning process, the actual pressure value of the clutch in the current rising process is measured, the actual pressure value of the clutch in the current falling process is measured, the actual pressure value of the clutch in the current rising process and the actual pressure value of the clutch in the current falling process are integrated, and the clutch pressure is obtained, so that the obtained electromagnetic valve characteristic curve is more accurate and real, and the control on the clutch pressure is more accurate.
Drawings
Fig. 1 is a control flowchart of the transmission control unit in the present embodiment.
Fig. 2 is a flow chart of the self-learning of the solenoid valve characteristic curve in the present embodiment.
Fig. 3 is a schematic diagram of the self-learning operation effect of the characteristic curve of the solenoid valve in the embodiment.
Detailed Description
The following description is directed to a self-learning method of a characteristic curve of a solenoid valve of one clutch, and the self-learning method of a characteristic curve of a solenoid valve of the other clutch is the same.
As shown in fig. 1 and 2, the self-learning method of the electromagnetic valve characteristic curve of the dual clutch automatic transmission is executed by a transmission control unit (i.e., TCU), the TCU can identify the clutch in an idle state, can acquire the electromagnetic valve self-learning state flag, the transmission oil temperature signal, the engine speed signal, the transmission gear signal and the hydraulic system main pressure target pressure signal, and can perform judgment processing, and the TCU can process the engine speed signal to obtain the engine speed change rate. The solenoid valve self-learning state flag is 0, which means that the solenoid valve self-learning state is waiting for self-learning, the solenoid valve self-learning state flag is 1, which means that the solenoid valve self-learning state is in-progress self-learning, and the solenoid valve self-learning state flag is 0x55, which means that the solenoid valve self-learning state is completed self-learning. As shown in fig. 3, in this embodiment, n is 5, and the preset 5 self-learning currents from small to large are I1、I2、I3、I4、I5The preset 4 self-learning currents from large to small are I4、I3、I2、I1。
As shown in fig. 1 and 2, the self-learning method of the solenoid valve characteristic curve of the dual clutch automatic transmission comprises the following steps:
step one, the TCU judges whether the electromagnetic valve self-learning state flag is 0x55 (when the whole vehicle is electrified, the initial value of the electromagnetic valve self-learning state flag is 0), if so, the operation is finished, otherwise, the second step is executed;
secondly, the TCU judges whether the self-learning state flag of the electromagnetic valve is 0, if so, the third step is executed, otherwise, the fifth step is executed;
step three, the TCU judges whether the conditions 1 a-1 f are met at the same time, if yes, the fourth step is executed, and if not, the process is ended;
step four, the TCU judges that the electromagnetic valve self-learning entering condition is met, assigns the electromagnetic valve self-learning state flag to 1, enables j =1, and then executes the step six;
step five, the TCU judges whether any one of the conditions 2 a-2 d is met, if so, the tenth step is executed, otherwise, the sixth step is executed;
sixthly, self-learning of the characteristic curve of the electromagnetic valve is carried out by the TCU, and then the seventh step is executed;
step seven, the TCU judges whether a characteristic curve of the electromagnetic valve is obtained or not, if so, the eighth step is executed, and if not, the process is ended;
eighthly, updating the stored electromagnetic valve characteristic curve (namely replacing the stored electromagnetic valve characteristic curve with the obtained electromagnetic valve characteristic curve) by the TCU to finish self-learning, and then executing the ninth step;
ninthly, the TCU assigns the self-learning state flag of the electromagnetic valve to 0x55, and then the operation is finished;
and step ten, the TCU assigns the self-learning state flag of the electromagnetic valve to 0 and then ends.
As shown in fig. 2, the TCU described in the sixth step performs the specific steps of self-learning the characteristic curve of the solenoid valve, including:
s1, the TCU requests all gear shifting forks corresponding to the clutch in the idle state to return to the neutral position (so that the pressure increase of the clutch can not transmit the engine torque to the wheel end and has no influence on the driving performance of the whole vehicle), and then S2 is executed;
s2, the TCU judges whether all gear shifting forks corresponding to the clutch in the idle state return to the neutral position, if so, S3 is executed, otherwise, the operation is finished;
s3, the TCU judges whether the self-learning current rising flag F is 1 (when the whole vehicle is electrified, the initial value of the self-learning current rising flag F is 1), if so, S4 is executed, otherwise, S10 is executed;
s4, TCU makes the current of the solenoid valve to be learned equal to the preset self-learning current IjThen, S5 is executed;
s5, TCU judges that the current of the electromagnetic valve to be learned is equal to the preset self-learning current IjWhether the later time exceeds the preset time T or not, if so, executing S6, otherwise, ending;
s6, TCU obtains and stores the actual pressure value Pr of the clutchjThen, S7 is executed;
s7, the TCU judges whether j is less than 5, if yes, S8 is executed, otherwise, S9 is executed;
s8, the TCU adds 1 to j, and then the process is finished;
s9, the TCU assigns the self-learning current rising flag F to 0 and then ends;
s10, TCU decrements j by 1, then executes S11;
s11, TCU makes the current of the solenoid valve to be learned equal to the preset self-learning current IjThen, S12 is executed;
s12, TCU judges that the current of the electromagnetic valve to be learned is equal to the preset self-learning current IjWhether the later time exceeds the preset time T or not, if so, executing S13, otherwise, ending;
s13, TCU obtains and stores the actual pressure value Pd of the clutchjThen, S14 is executed;
s14, the TCU judges whether j is equal to 1, if yes, S15 is executed, otherwise, the operation is finished;
s15, TCU Pd5=Pr5And using the formula: pi=(1-Ki)*Pri+Ki*PdiCalculating the self-learning current IiCorresponding clutch pressure PiI take all integers from 1 to 5 in turn, to obtain 5 clutch pressures P1、P2、P3、P4、P5(ii) a Wherein, K1、K2、K3、K4、K5For calibrated correction factors, K1、K2、K3、K4、K5Are all greater than or equal to 0 and less than or equal to 1; then, S16 is executed;
s16, 5 self-learning currents I1、I2、I3、I4、I5And 5 clutch pressures P1、P2、P3、P4、P5And (5) obtaining the characteristic curves of the electromagnetic valves in a one-to-one correspondence mode, and then ending.
Wherein, condition 1a is: the transmission oil temperature is within a preset oil temperature range. Condition 1b is: the engine speed is within a preset speed range. Condition 1c is: the engine speed rate of change is within a predetermined speed rate range. Condition 1d is: the current gear of the transmission is in a preset gear (namely, the vehicle running gear is a gear corresponding to the clutch in the working state). Condition 1e is: the clutch corresponding to the solenoid valve to be learned is in an idle state, the dual-clutch automatic transmission is provided with two clutches, for example, the current gear corresponds to the first clutch to work, the solenoid valve to be learned is the solenoid valve corresponding to the second clutch, and the idle state means that the clutch does not have combination requirements and the requested pressure value is 0. Condition 1f is: the main pressure target pressure of the hydraulic system is in a preset pressure range, and the main pressure target pressure refers to the main oil path target pressure established by the rotation of the oil pump. Condition 2a is: the transmission oil temperature is not within a preset oil temperature range. Condition 2b is: the engine speed is not within the preset speed range. Condition 2c is: the hydraulic system main pressure target pressure is not within a preset pressure range. Condition 2d is: the clutch corresponding to the self-learning electromagnetic valve has combination requirements.
The present embodiment also provides a self-learning system of solenoid valve characteristic curves of a dual clutch automatic transmission, including a transmission control unit programmed to perform the above-described self-learning method of solenoid valve characteristic curves of a dual clutch automatic transmission.
Claims (5)
1. A self-learning method for a characteristic curve of an electromagnetic valve of a dual-clutch automatic transmission is characterized by comprising the following steps: when the electromagnetic valve self-learning state is waiting for self-learning and the electromagnetic valve self-learning entering condition is met, the electromagnetic valve characteristic curve is self-learned, and the following steps are executed:
requesting all gear shifting forks corresponding to a clutch in an idle state to return to a neutral position;
step two, sequentially applying preset n self-learning currents I from small to large to the solenoid valve to be learned1、I2、...、InAcquiring and storing the actual pressure value of the clutch corresponding to each self-learning current to obtain n actual pressure values Pr of the clutch1、Pr2、...、Prn(ii) a Wherein n is an integer and n is not less than 3;
step three, sequentially applying preset n-1 self-learning currents I from large to small to the electromagnetic valve to be learnedn-1、In-2、...、I1Acquiring and storing the actual pressure value of the clutch corresponding to each self-learning current to obtain n-1 actual pressure values Pd of the clutchn-1、Pdn-2、...、Pd1；
Step four, leading Pdn=PrnAnd using the formula: pi=(1-Ki)*Pri+Ki*PdiCalculating the self-learning current IiCorresponding clutch pressure PiObtaining n clutch pressures P1、P2、...、Pn(ii) a Wherein, KiFor calibrated correction factor, K is more than or equal to 0iLess than or equal to 1, i sequentially taking all integers from 1 to n;
step five, carrying out self-learning on n currents I1、I2、...、InWith n clutch pressures P1、P2、...、PnThe electromagnetic valve characteristic curves are obtained in a one-to-one correspondence mode and stored, and therefore self-learning is completed;
in the self-learning process, if the self-learning exit condition of the electromagnetic valve is met, the self-learning of the characteristic curve of the electromagnetic valve exits.
2. The self-learning method of the solenoid valve characteristic curve of the dual clutch automatic transmission according to claim 1, characterized in that: during self-learning, the self-learning state of the electromagnetic valve is changed into self-learning; when quitting the self-learning of the characteristic curve of the electromagnetic valve, the self-learning state of the electromagnetic valve is changed into a state of waiting for the self-learning; after the self-learning is completed, the solenoid valve self-learning state is changed to be completed.
3. The self-learning method of the solenoid valve characteristic curve of the dual clutch automatic transmission according to claim 1 or 2, characterized in that: if the conditions 1 a-1 f are simultaneously met, judging that the electromagnetic valve self-learning entry condition is met; wherein,
condition 1a is: the transmission oil temperature is within a preset oil temperature range;
condition 1b is: the rotating speed of the engine is in a preset rotating speed range;
condition 1c is: the engine speed change rate is within a preset speed change rate range;
condition 1d is: the current gear of the transmission is in a preset gear;
condition 1e is: the clutch corresponding to the solenoid valve to be learned is in an idle state;
condition 1f is: the main pressure target pressure of the hydraulic system is within a preset pressure range.
4. The self-learning method of the solenoid valve characteristic curve of a dual clutch automatic transmission according to claim 2 or 3, characterized in that: if any one of the conditions 2a to 2d is satisfied, judging that the self-learning exit condition of the electromagnetic valve is satisfied; wherein,
condition 2a is: the oil temperature of the transmission is not in a preset oil temperature range;
condition 2b is: the rotating speed of the engine is not in a preset rotating speed range;
condition 2c is: the main pressure target pressure of the hydraulic system is not in a preset pressure range;
condition 2d is: the clutch corresponding to the self-learning electromagnetic valve has combination requirements.
5. A self-learning system of solenoid valve characteristic curves of a dual clutch automatic transmission comprises a transmission control unit, and is characterized in that: the transmission control unit is programmed to carry out a method of self-learning of the characteristic curves of the solenoid valves according to any one of claims 1 to 4.
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| CN114321483A (en) * | 2021-12-15 | 2022-04-12 | 浙江吉利控股集团有限公司 | Automatic control method for electromagnetic valve of clutch |
| CN114321483B (en) * | 2021-12-15 | 2024-03-12 | 浙江吉利控股集团有限公司 | Automatic control method for clutch electromagnetic valve |
| CN114738399A (en) * | 2022-02-28 | 2022-07-12 | 重庆青山工业有限责任公司 | Pressure zero point self-adaptive control method for wet DCT (dual clutch transmission) |
| CN114738399B (en) * | 2022-02-28 | 2024-01-19 | 重庆青山工业有限责任公司 | Pressure zero self-adaptive control method for wet DCT (discrete cosine transform) transmission clutch |
| CN115750781A (en) * | 2022-11-26 | 2023-03-07 | 重庆长安汽车股份有限公司 | Self-learning method and system for flow valve QI characteristic data of transmission and vehicle |
| CN115750781B (en) * | 2022-11-26 | 2024-05-14 | 重庆长安汽车股份有限公司 | Self-learning method and system for QI characteristic data of flow valve of transmission and vehicle |
| CN116085463A (en) * | 2023-01-02 | 2023-05-09 | 重庆长安汽车股份有限公司 | Clutch solenoid valve P-I curve self-learning method and system of hybrid transmission |
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Application publication date: 20210604 |