JP2007071311A - Clutch control initial learning method and clutch drive controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set, with a high degree of precision, initial control pressure in performing release control or slip control for a clutch mechanism by detecting a slip state of the clutch mechanism such as a lockup clutch with a certainty and a high degree of precision to practice high-precision learning. <P>SOLUTION: A time required for an instantaneous value and time integral value of a slip revolution speed in the lockup clutch to each reach a value of each target slip revolution are measured as an instantaneous release time Tnslipabs and an integral value release time Tnslipsum. By evaluation for both the release times of Tnslipabs and Tnslipsum (S160, S162, S174), a learning gain KG is set (S166, S168, S172) to calculate a learning correction value dPofs (S167), thereby practicing learning of the initial control pressure. Each defect can be complemented to attain the problem by thus estimating the release times of Tnslipabs and Tnslipsum together. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention controls the release of the clutch mechanism in the engaged state by adjusting the driving pressure from the pressure source with respect to the clutch mechanism connecting the output rotating shaft on the rotational drive source side and the input rotating shaft on the rotational load side. Alternatively, the present invention relates to a control initial pressure learning method and clutch drive control device for slip control.

There is known a device that learns and corrects an initial pressure at the start of slip control when slip-controlling a lock-up clutch provided in a torque converter by feedback (see, for example, Patent Document 1). In this technique, a learning value is set by calculating a learning correction amount from the difference between the time until the lockup clutch starts to slip and the target time.
Japanese Patent Laying-Open No. 2003-65432 (pages 12-13 and FIGS. 14-15)

  However, in the learning value setting by the method of Patent Document 1, the magnitude of the instantaneous value of the slip amount (slip rotation number) obtained by measuring the difference between the engine rotation speed and the turbine rotation speed is compared with a predetermined value, whereby the lockup clutch It is time to start to slip.

  Only by comparing the instantaneous value of the slip rotation speed with a predetermined value, the released state can be determined reliably, but there is a problem that it is difficult to grasp the timing to start releasing and the slip state is difficult to obtain accurately. The slip start timing varies, and it is difficult to obtain a highly accurate learning value.

  The present invention can detect a slip state reliably and with high accuracy, perform highly accurate learning based on the slip state, and set a control initial pressure when performing release control or slip control of the clutch mechanism with high accuracy. It is intended to do.

In the following, means for achieving the above object and its effects are described.
The clutch control initial pressure learning method according to claim 1 is configured such that a driving pressure from a pressure source is applied to a clutch mechanism that connects between an output rotation shaft on a rotary drive source side and an input rotation shaft on a rotary load side. Is an initial control pressure learning method for releasing control or slip control of the engaged clutch mechanism, and the instantaneous value of the slip rotation speed of the clutch mechanism reaches the instantaneous reference value from the start of control. And the second elapsed time from the start of control until the time accumulated value of the slip rotation speed reaches the accumulated reference value, and the first elapsed time and the second elapsed time Based on the evaluation, learning of the control initial pressure is performed.

  The elapsed time until the instantaneous value and the time integrated value of the slip rotation speed of the clutch mechanism reach the respective reference values is measured as the first elapsed time and the second elapsed time. Then, learning of the control initial pressure is executed based on the evaluation with respect to both the first elapsed time and the second elapsed time.

  Thus, not only the first elapsed time measured for the instantaneous value of the slip rotation speed but also the second elapsed time measured for the time integrated value of the slip rotation speed is evaluated. Based on both evaluations, the control initial pressure is learned.

  The second elapsed time is the time until the time integration value of the slip rotation speed reaches the integration reference value, and is easily affected by the rotation speed calculation accuracy and rotation fluctuation, but the timing at which the slip has started to be released can be detected with high accuracy. . For this reason, the disadvantage that it is difficult to grasp the start timing of release, which is a problem in the first elapsed time based on the instantaneous value, can be supplemented by evaluating the second elapsed time together with the first elapsed time.

  In addition, the first elapsed time based on the instantaneous value is relatively insensitive to the rotational speed calculation accuracy and the rotational fluctuation, so that the disadvantage of the second elapsed time based on the time integrated value can be supplemented. For this reason, it becomes difficult to be influenced by the rotational speed calculation accuracy and the rotational fluctuation, and it becomes possible to grasp the timing when the release starts with high accuracy.

  Therefore, by learning the control initial pressure based on the evaluation of the first elapsed time and the second elapsed time, learning based on the slip state detected reliably and accurately can be performed, and the clutch mechanism is released or controlled. The initial control pressure can be set with high accuracy.

  The clutch control initial pressure learning method according to claim 2, wherein the learning of the control initial pressure is based on the evaluation of the first elapsed time and the second elapsed time. It is executed by updating a value.

Thus, learning may be performed by updating the learning value of the control initial pressure based on the evaluation of the first elapsed time and the second elapsed time.
Therefore, even if learning of the control initial pressure is executed, learning based on the slip state detected with high accuracy can be performed, and the control initial pressure when the clutch mechanism is controlled to be released or slip controlled can be set with high accuracy.

  The clutch control initial pressure learning method according to claim 3, wherein the evaluation of the first elapsed time and the second elapsed time is based on a target elapsed time between the first elapsed time and the second elapsed time. The learning value is updated by calculating a learning value correction amount according to the combination of the convergence presence / absence and correcting the old learning value by the learning value correction amount. It is performed by calculating a learning value.

  As evaluation, you may classify | categorize the combination of the presence or absence of convergence to the target elapsed time of 1st elapsed time and 2nd elapsed time. In this case, the learning value is updated by calculating a learning value correction amount according to the classification of the combination of convergence / non-convergence and calculating a new learning value by correcting the old learning value by the learning value correction amount.

  This also enables learning of the control initial pressure based on the evaluation of the first elapsed time and the second elapsed time. Thus, by learning based on the slip state detected reliably and with high accuracy, the control initial pressure when performing release control or slip control of the clutch mechanism can be set with high accuracy.

  In the clutch control initial pressure learning method according to claim 4, in claim 3, the classification of the combination of presence / absence of convergence is performed when only one of the first elapsed time and the second elapsed time is converged. , When both of them converge, and when only one of them converges, the learning gain corresponding to the difference between the first elapsed time and the second elapsed time is calculated. The learning value correction amount is calculated from the product of the difference between the elapsed time that has converged and the target elapsed time and the learning gain, and when both are converged, the first elapsed time or the A learning gain is calculated based on a comparison between the second elapsed time and the target elapsed time, and the product of the difference between the first elapsed time or the second elapsed time and the target elapsed time and the learning gain is used. The learning value correction amount is calculated. That.

  As classification, you may classify | categorize into the case where only one of 1st elapsed time and 2nd elapsed time has converged, and the case where both have converged. The learning gain corresponding to each classification is calculated as described above, and the learning value correction amount can be calculated from the product of the difference between the first elapsed time or the second elapsed time and the target elapsed time and the learning gain.

  This also enables learning of the control initial pressure based on the evaluation of the first elapsed time and the second elapsed time. The initial control pressure when the clutch mechanism is subjected to release control or slip control can be set with high accuracy by learning based on the slip state detected reliably and with high accuracy.

  The clutch control initial pressure learning method according to claim 5, wherein the rotational drive source is one or both of an internal combustion engine and an electric motor mounted on a vehicle. The mechanism is a lock-up clutch provided in the torque converter.

  In this way, when the internal combustion engine and the electric motor mounted on the vehicle are used as a rotational drive source, the object of release control or slip control can be configured as a lock-up clutch provided in the torque converter. This also enables learning of the control initial pressure based on the evaluation of the first elapsed time and the second elapsed time. Then, by learning based on the slip state detected reliably and with high accuracy, it is possible to set the control initial pressure at the time of releasing control or slip control of the clutch mechanism with high accuracy, and more stable release control or Slip control can be executed.

  The clutch drive control device according to claim 6 adjusts the drive pressure supplied from the pressure source by connecting the clutch mechanism connecting the output rotation shaft on the rotation drive source side and the input rotation shaft on the rotation load side. A first drive time detection device for detecting a first elapsed time from the start of release control or slip control until an instantaneous value of the slip rotation speed of the clutch mechanism reaches an instantaneous reference value. Means, a second elapsed time detecting means for detecting a second elapsed time from the start of the release control or slip control until the time integrated value of the slip rotation speed reaches the integrated reference value, and the first elapsed time detecting means A learning value calculating means for calculating a learning value of the control initial pressure based on the evaluation of the first elapsed time detected in step 2 and the second elapsed time detected by the second elapsed time detecting means; , The release control or slip control of the serial clutch mechanism, characterized in that a drive pressure control means for starting the control initial pressure set based on the calculated learned value by the learning value calculation means.

  The learning value calculation means calculates the learning value of the control initial pressure based on the evaluation of both the first elapsed time and the second elapsed time. Therefore, the drive pressure control means starts the release control or the slip control of the clutch mechanism from the control initial pressure reflecting the evaluation of both the first elapsed time and the second elapsed time.

  Therefore, as described above, the learning value calculation means can learn based on the slip state detected reliably and with high accuracy by mutually compensating for the respective disadvantages of the first elapsed time and the second elapsed time. The initial control pressure when the clutch mechanism is controlled to release or slip can be set with high accuracy.

  According to a seventh aspect of the present invention, in the clutch drive control device according to the sixth aspect, the learning value calculation means corrects the old learning value based on the evaluation of the first elapsed time and the second elapsed time, and sets a new value. A learning value is calculated.

  Thus, the learning value calculation means corrects the old learning value based on the evaluation of the first elapsed time and the second elapsed time and calculates the new learning value, thereby detecting the slip state detected reliably and with high accuracy. The learned value of the reflected control initial pressure can be calculated. Thus, the drive pressure control means can set the control initial pressure when the clutch mechanism is released or slip controlled with high accuracy.

  The clutch drive control apparatus according to claim 8, wherein the learning value calculation unit is configured to evaluate the first elapsed time and the second elapsed time as evaluations of the first elapsed time and the second elapsed time. An elapsed time evaluation means for classifying a combination of time and convergence to a target elapsed time, a learning value correction amount calculation means for calculating a learning value correction amount according to the classification by the elapsed time evaluation means, and the learning value correction And a learning value updating unit that corrects the old learning value by the learning value correction amount calculated by the amount calculating unit and calculates a new learning value.

  The learning value calculation means may classify the combination of the presence or absence of convergence of the first elapsed time and the second elapsed time to the target elapsed time by the elapsed time evaluation means. Then, the learning value correction amount calculating means calculates a learning value correction amount according to this classification.

  Since the learning value update means corrects the old learning value and calculates a new learning value using the learning value correction amount, the learning value calculation means determines the learning value based on the evaluation of the first elapsed time and the second elapsed time. Learning of the control initial pressure can be executed, and a learning value reflecting the slip state detected reliably and with high accuracy can be calculated. Thus, the drive pressure control means can set the control initial pressure when the clutch mechanism is released or slip-controlled with high accuracy.

  According to a ninth aspect of the present invention, in the clutch drive control device according to the eighth aspect, the elapsed time evaluation means converges when only one of the first elapsed time and the second elapsed time has converged. The learning value correction amount calculating means is configured such that only one of the first elapsed time and the second elapsed time is converged by the classification of the elapsed time evaluation means. Calculates a learning gain corresponding to the difference between the first elapsed time and the second elapsed time, and calculates the learning from the product of the difference between the converged elapsed time and the target elapsed time and the learning gain. When the value correction amount is calculated and the classification of the elapsed time evaluation means is such that both the first elapsed time and the second elapsed time converge, the first elapsed time or the second elapsed time Based on the comparison between the elapsed time and the target elapsed time And calculating the gain, and calculates the learning value correction amount from the product of the difference between the learning gain between the first elapsed time and the second elapsed time and the target time elapsed.

  The elapsed time evaluation means may be classified into a case where only one of the first elapsed time and the second elapsed time has converged and a case where both have converged. The learning value correction amount calculating means calculates the learning gain corresponding to each classification as described above, and corrects the learning value from the product of the difference between the first elapsed time or the second elapsed time and the target elapsed time and the learning gain. The amount can be calculated.

  Also by this, the learning value calculation means can perform learning of the control initial pressure based on the evaluation of the first elapsed time and the second elapsed time, and the learning value reflecting the slip state detected reliably and with high accuracy. Can be calculated. Thus, the drive pressure control means can set the control initial pressure when the clutch mechanism is released or slip-controlled with high accuracy.

  In the clutch drive control device according to claim 10, in any one of claims 6 to 9, the rotational drive source is one or both of an internal combustion engine and an electric motor mounted on a vehicle, and the clutch mechanism is It is a lock-up clutch provided in the torque converter.

  In this way, when the internal combustion engine and the electric motor mounted on the vehicle are used as a rotational drive source, the object of release control or slip control can be configured as a lock-up clutch provided in the torque converter. Also by this, the learning value calculation means can perform learning of the control initial pressure based on the evaluation of the first elapsed time and the second elapsed time, and the learning value reflecting the slip state detected reliably and with high accuracy. Can be calculated. Thus, the drive pressure control means can set the control initial pressure when the clutch mechanism is released or slip-controlled with high accuracy.

  Therefore, more stable release control or slip control can be executed on the controlled object.

[Embodiment 1]
FIG. 1 is a block diagram of a vehicle engine 2 and an automatic transmission 4 to which the above-described invention is applied. The engine 2 that is a rotational drive source corresponds to an internal combustion engine such as a gasoline engine or a diesel engine. In addition to such an engine, an electric motor may be used, or a hybrid engine including an internal combustion engine and an electric motor may be used.

  In the automatic transmission 4, a torque converter 6 is disposed on the engine 2 side, and torque is transmitted from the crankshaft 2 a of the engine 2 to the converter cover 6 a of the torque converter 6. Thus, the pump impeller 6b integrated with the converter cover 6a rotates the turbine runner 6c via the internal fluid (here, hydraulic oil). The turbine runner 6 c rotates the input shaft 8 a of the automatic transmission main body 8. As a result, the rotational force shifted according to the gear stage state in the automatic transmission main body 8 is transmitted from the output shaft 8b to the wheel side via the drive system.

  The torque converter 6 is provided with a lock-up clutch 10 (corresponding to a clutch mechanism), and when the lock-up clutch 10 is engaged, the crank shaft 2a of the engine 2 and the input shaft 8a of the automatic transmission main body 8 are directly connected. Connection is possible.

  Engagement control / release control of the lockup clutch 10 is performed by controlling a hydraulic control circuit 14 by a shift ECU (electronic control unit) 12. Here, by adjusting the release pressure Pr with respect to the constant converter pressure Pc, the engagement / release control of the lockup clutch 10 is performed by the differential pressure dP (Pa) between the converter pressure Pc and the release pressure Pr. Note that slip control may be executed in addition to or in place of the release control.

  The speed change ECU 12 receives an engine speed Ne signal from an engine speed sensor 16 that detects the speed of the crankshaft 2a. Further, from the input shaft rotational speed sensor 18 that detects the rotational speed of the input shaft 8a of the automatic transmission body 8 and from the output shaft rotational speed sensor 20 that detects the rotational speed of the output shaft 8b. Output shaft rotation speed No signal is input. In addition, a shift position signal, a throttle opening signal, and other signals are input. The engine control ECU also performs data communication with each other. Based on these signals and data, the shift ECU 12 drives the hydraulic control circuit 14 of the torque converter 6 and the hydraulic control circuit 22 for switching gears of the automatic transmission main body 8 to drive the pressure from a pressure source such as an oil pump. The supply pressure is adjusted to control the automatic transmission 4.

  In the release control executed by the shift ECU 12, the differential pressure dP is first controlled to the control initial pressure Pini at the initial stage of control. The state of the initial control initial pressure Pini set at the beginning is important for smoothly starting the subsequent release control. Therefore, in order to obtain an appropriate control initial pressure Pini, a learning value Pofs (Pa) for setting the control initial pressure Pini is obtained in the release control. Note that the calculation of the learning value Pofs is also important when slip control is executed.

  The flowchart of FIG. 2 shows the lockup release control pressure calculation process, the flowchart of FIG. 3 shows the control initial pressure learning value setting process, and the flowcharts of FIGS. 4 and 5 show the learning value correction amount calculation process. The steps in the flowchart corresponding to the individual processing contents are represented by “S˜”.

  The lockup release control pressure calculation process (FIG. 2) will be described. This process is a process that is repeatedly executed in a short cycle during the release control of the lockup clutch 10 that is performed when the vehicle is decelerated or the like.

  When this process is started, it is first determined whether or not release control is in the initial stage (S100). If the release control is in the initial stage (yes in S100), the basic control pressure Plc (Pa) is calculated from the map MAPplc shown in FIG. 6 using the vehicle deceleration DG at this time as a parameter (S102). Here, the larger the vehicle deceleration DG (the smaller the acceleration is, the smaller the acceleration), the larger the basic control pressure Plc is set. The vehicle deceleration DG is calculated from the deceleration of the output shaft rotational speed No. It may be detected by providing a special G sensor in the vehicle.

  Next, the initial control pressure Pini is set to the lockup release control pressure Plcoff (0) reflected in the differential pressure dP (S104). This initial control pressure Pini is calculated from the basic control pressure Plc and the learned value Pofs according to Equation 1.

[Formula 1] Pini ← Plc + Pofs
Here, the learning value Pofs is a value calculated during the previous release control as described later.
In this way, this process is once completed. As a result, the hydraulic pressure control circuit 14 is adjusted by the shift ECU 12 so that the differential pressure dP (= Pc−Pr) between the converter pressure Pc and the release pressure Pr becomes the calculated control initial pressure Pini. .

  In the next control cycle, since the release control is not in the initial stage (no in S100), a new lock is obtained by adding the fluctuation value dPlcoff (<0) to the old lockup release control pressure Plcoff (i-1) as shown in Equation 2. The up release control pressure Plcoff (i) is calculated (S106).

[Formula 2] Plcoff (i) <-Plcoff (i-1) + dPlcoff
Note that (i) represents the lockup release control pressure Plcoff calculated in the current control cycle, and (i-1) represents the lockup release control pressure Plcoff calculated in the previous control cycle. The same applies to other expressions.

  In the present embodiment, since the lockup release control pressure Plcoff is changed from the engaged state to the fully released state of the lockup clutch 10, the fluctuation value dPloff is a negative value, but the value may be a constant value. A fixed ratio of the lockup release control pressure Plcoff (i-1) may be used. If slip control is executed instead of releasing completely, the fluctuation value dPlcoff is set so as to achieve the target slip ratio by feedback control.

  Thereafter, as long as the release control continues, it is determined as no in step S100 and step S106 is executed every control cycle, and the lockup release control pressure Ploff gradually decreases. When the lockup clutch 10 is finally completely released, the release control is finished and the lockup clutch 10 is maintained in the released state.

  The learning value Pofs used in Equation 1 is calculated by the control initial pressure learning value setting process (FIG. 3). This process is also a process that is repeatedly executed in a short period during the release control of the lockup clutch 10.

  When this process is started, it is first determined whether or not learning is completed (S120). Since learning is not completed while a new learning value correction amount dPofs has not yet been set in a learning value correction amount calculation process (FIGS. 4 and 5), which will be described later (No in S120), this processing is temporarily terminated.

  Then, when the learning value correction amount dPofs is newly set in the learning value correction amount calculation processing (FIGS. 4 and 5), learning is completed (yes in S120). (i-1) is corrected by the learning value correction amount dPofs, and a new learning value Pofs (i) is calculated (S122).

[Formula 3] Pofs (i) <-Pofs (i-1) + dPofs
If the learning value Pofs (i) is newly calculated in this way (S122), then the end of this process is set (S124), and the periodic execution of this process ends. Therefore, the control initial pressure learning value setting process (FIG. 3) is not executed until the release control is started again.

The learning value correction amount calculation processing (FIGS. 4 and 5) will be described. This process is also a process that is repeatedly executed in a short period during the release control of the lockup clutch 10.
When this process is started, it is first determined whether or not learning is permitted (S150). This learning permission is separately determined by the shifting ECU 12. For example, the learning permission is not issued when there is a possibility that the oil pressure in the oil pressure control circuit 14 is excessively high, which may hinder the oil pressure control. Therefore, it is determined as no in step S150, and the present process is temporarily terminated. For this reason, substantial processing is not performed.

When learning is permitted (yes in S150), it is determined whether or not the calculation of the instantaneous value release time Tnslipabs has been completed (S152).
The calculation of the instantaneous value release time Tnslipabs (corresponding to the first elapsed time) is performed as shown in FIG. This instantaneous value release time Tnslipabs calculation process (FIG. 7) is a process that is repeatedly executed at a constant short period. First, it is determined whether or not the instantaneous value LCslipabs of the slip rotational speed is equal to or greater than the instantaneous slip target rotational speed TGslipabs (S180). Here, the instantaneous value LCslipabs of the slip rotational speed is a difference (Ne−) between the engine rotational speed Ne detected by the engine rotational speed sensor 16 and the input shaft rotational speed Ni detected by the input shaft rotational speed sensor 18. Ni). The target slip rotational speed TGslipabs for instantaneous value (corresponding to the instantaneous reference value) is a value set by experiment and theoretical calculation to capture the slip start state with high accuracy, and confirms that the slip has started reliably. Possible values are set in advance.

  If the instantaneous value LCslipabs is still smaller than the instantaneous value target slip rotation speed TGslipabs (No in S180), the instantaneous value release time Tnslipabs is counted up (S182). Here, the instantaneous value release time Tnslipabs is incremented. At the start of each release control, 0 is set as the initial value of the instantaneous value release time Tnslipabs.

  Therefore, while LCslipabs <TGslipabs (no in S180), the value of the instantaneous value release time Tnslipabs increases from 0 with time.

  When the rotational speed difference (Ne-Ni) between the crankshaft 2a of the engine 2 and the input shaft 8a of the automatic transmission main body 8 gradually increases and LCslipabs ≧ TGslipabs (yes in S180), the instantaneous value release time Tnslipabs is calculated. Is completed (S184). Therefore, a value corresponding to the time from when the release control starts until the instantaneous value LCslipabs of the slip rotation speed reaches the target slip rotation speed TGslipabs for the instantaneous value is set as the instantaneous value release time Tnslipabs.

  Returning to the description of FIG. 4, if the calculation of the instantaneous value release time Tnslipabs by the instantaneous value release time Tnslipabs calculation process (FIG. 7) is not completed (No in S152), the present process is terminated.

  If step S184 of the instantaneous value release time Tnslipabs calculation process (FIG. 7) is executed and the calculation of the instantaneous value release time Tnslipabs is completed (yes in S152), then the calculation of the integrated value release time Tnslipsum is completed. Is determined (S154).

  The calculation of the integrated value release time Tnslipsum (corresponding to the second elapsed time) is performed as shown in FIG. The integrated value release time Tnslipsum calculation process (FIG. 8) is a process repeatedly executed at a constant short period. First, the time integrated value LCslipsum of the slip rotation speed is calculated by the equation 4 (S190).

[Formula 4] LCslipsum (i) <-LCslipsum (i-1) + Slip
The slip rotational speed Slip is a difference (Ne−Ni) between the engine rotational speed Ne and the input shaft rotational speed Ni at this time.

The slip rotational speed Slip is integrated with the time integrated value LCslipsum of the slip rotational speed in the time period according to the above equation 4.
Next, it is determined whether or not the time integration value LCslipsum of the slip rotation number is equal to or greater than the integration value target slip rotation number TGslipsum (S192). Here, the target slip rotational speed TGslipsum for integrated value (corresponding to the integrated reference value) is a value set by experiment or theoretical calculation to capture the slip start state with high accuracy by the time integrated value LCslipsum of the slip rotational speed. There is a preset value that can reliably confirm that the slip has started.

  If the time integration value LCslipsum is still smaller than the integration value target slip rotation speed TGslipsum (no in S192), the integration value release time Tnslipsum is counted up (S194). Here, the integrated value release time Tnslipsum is incremented. At the start of each release control, 0 is set as the initial value of the integrated value release time Tnslipsum.

  Therefore, while LCslipsum <TGslipsum (no in S192), the value of the integrated value release time Tnslipsum increases from 0 as time elapses.

  When the slip state between the crankshaft 2a of the engine 2 and the input shaft 8a of the automatic transmission main body 8 continues and LCslipsum ≧ TGslipsum is satisfied (yes in S192), the calculation of the integrated value release time Tnslipsum is completed ( S196). Therefore, a value corresponding to the time from when the release control starts until the time accumulated value LCslipsum of the slip rotation speed reaches the accumulated value target slip rotation speed TGslipsum is set as the accumulated value release time Tnslipsum.

  Returning to the description of FIG. 4, if the integrated value release time Tnslipsum calculation processing (FIG. 8) is not completed (No in S154), this processing is terminated.

  When step S196 of the integrated value release time Tnslipsum calculation process (FIG. 8) is executed, the calculation of the integrated value release time Tnslipsum is completed (yes in S154). Therefore, it is next determined whether or not the absolute value (| Tnslipsum-Tref |) of the difference between the integrated value release time Tnslipsum and the target release time Tref (corresponding to the target elapsed time) is smaller than the reference value α (S156).

  If | Tnslipsum-Tref | <α (yes in S156), that is, if the integrated value release time Tnslipsum has converged to the target release time Tref, the integrated value release time Tnslipsum is equal to the release time Tnslip. It is set (S158).

  On the other hand, if | Tnslipsum-Tref | ≧ α (no in S156), the integrated value release time Tnslipsum has not converged to the target release time Tref, and therefore step S158 is not executed.

  After step S158 or after the determination of no in step S156, whether or not the absolute value (| Tnslipabs−Tref |) of the difference between the instantaneous value release time Tnslipabs and the target release time Tref is smaller than the reference value α. It is determined (S160).

  Here, if | Tnslipabs−Tref | <α (yes in S160), that is, if the instantaneous value release time Tnslipabs has converged to the target release time Tref, then the integrated value release time Tnslipsum is set to the release time Tnslip. It is determined whether or not it is performed (S162). That is, it is determined whether step S158 is being executed.

  Here, it is assumed that the integrated value release time Tnslipsum is set to the release time Tnslip (yes in S162). That is, when both the integrated value release time Tnslipsum and the instantaneous value release time Tnslipabs have converged to the target release time Tref, it is next determined whether or not the release time Tnslip is equal to or greater than the target release time Tref (S164).

If Tnslip ≧ Tref (yes in S164), a constant learning gain KG2 is set to the learning gain KG used in Equation 5 described later (S166).
On the other hand, if Tnslip <Tref (no in S164), the learning gain KG3 having a constant value is set as the learning gain KG used in Equation 5 described later (S168).

  In other words, if it is determined as yes in step S162, one of learning gains KG2 and KG3 having a constant value is expressed based on the magnitude relationship between the release time Tnslip (= Tnslipsum) and the target release time Tref. Is used as the learning gain KG.

  These learning gains KG2 and KG3 are determined by experiments and theoretical calculations, and are values appropriately set according to the types of the automatic transmission 4, the torque converter 6, the lockup clutch 10, and the hydraulic control circuits 14 and 22. Therefore, the learning gains KG2 and KG3 may be different values or the same value. Note that one or both of the learning gains KG2 and KG3 may be changed in accordance with the difference between the release time Tnslip and the target release time Tref.

After step S166 or step S168, a learning value correction amount dPofs is calculated using equation 5 (S167).
[Formula 5] dPofs ← KG · (Tnslip-Tref)
That is, the learning value correction amount dPofs is calculated by the product of the difference between the target release time Tref and the release time Tnslip and the learning gain KG.

  If it is determined no in step S162, only the instantaneous value release time Tnslipabs has converged to the target release time Tref, so the instantaneous value release time Tnslipabs is set as the release time Tnslip (S170). ).

  If NO is determined in step S160, it is determined whether or not the integrated value release time Tnslipsum is set as the release time Tnslip (S174). That is, it is determined whether step S158 is being executed. Here, if the integrated value release time Tnslipsum is set to the release time Tnslip (yes in S174), only the integrated value release time Tnslipsum has converged to the target release time Tref, so the process of step S170 is not performed.

  Then, after step S170 or when it is determined yes in step S174, the above equation is obtained from the learning gain map MAPkg1 shown in FIG. 9 according to the difference between the integrated value release time Tnslipsum and the instantaneous value release time Tnslipabs. 3 learning gain KG is obtained (S172). That is, the larger the | Tnslipsum-Tnslipabs |, the larger the learning gain KG is set. Note that the learning gain KG does not always increase in the same tendency on the Tnslipsum> Tnslipabs side and on the Tnslipsum <Tnslipabs side, but the automatic transmission 4, the torque converter 6, the lockup clutch 10, and the hydraulic control circuit 14 , 22 as appropriate.

Then, the learning value correction amount dPofs is calculated by the equation 5 (S167).
If it is determined no in both step S160 and step S174, the learning gain KG is not set, and the learning value correction amount dPofs according to Equation 5 is not calculated.

  An example of processing in this embodiment is shown in the timing chart of FIG. Before the timing t0, the lockup clutch 10 is in a completely engaged state. When the release control is started at the timing t0, the differential pressure dP between the converter pressure Pc and the release pressure Pr is immediately adjusted to the control initial pressure Pini. Thereafter, the fluctuation value dP1coff (<0) is reduced, and finally the lockup clutch 10 is completely released. In addition, after adjusting the differential pressure dP to the control initial pressure Pini, a process of adjusting the fluctuation value dP1coff by slip control may be performed.

  Each of the processes in FIGS. 2 to 5 and 7 and 8 is started from the timing t0, and the calculation of the learning value Pofs according to FIGS. 3 to 5 and 7 and 8 has completed the calculation of the new learning value Pofs (i). Thus, the process ends here at timing t1.

In the example of FIG. 10, the fuel cut is also executed thereafter (t2). The fluctuation value dPlcoff may be changed by executing this fuel cut.
In the configuration described above, the instantaneous value release time Tnslipabs calculation process (FIG. 7) is a process as the first elapsed time detection means, and the integrated value release time Tnslipsum calculation process (FIG. 8) is a process as the second elapsed time detection means. Equivalent to. The control initial pressure learned value setting process (FIG. 3) and the learned value correction amount calculating process (FIGS. 4 and 5) are the processes as the learned value calculating means, and the lockup release control pressure calculating process (FIG. 2) is the driving pressure control means. It corresponds to the processing as.

  Steps S156, S160, S162, and S174 of the learning value correction amount calculation processing (FIGS. 4 and 5) correspond to processing as elapsed time evaluation means. Steps S164, S166, S167, S168, and S172 correspond to processing as learning value correction amount calculation means. Step S122 of the control initial pressure learning value setting process (FIG. 3) corresponds to a process as a learning value update means.

According to the first embodiment described above, the following effects can be obtained.
(I). The elapsed time until the instantaneous value LCslipabs of the slip rotational speed of the lockup clutch 10 reaches the instantaneous value target slip rotational speed TGslipabs is measured as an instantaneous value release time Tnslipabs (FIG. 7). Furthermore, the elapsed time until the time integrated value LCslipsum of the slip rotation speed of the lockup clutch 10 reaches the target slip rotation number TGslipsum for integrated value is measured as the integrated value release time Tnslipsum (FIG. 8).

  Then, learning of the control initial pressure Pini is executed based on the evaluation with respect to both the instantaneous value release time Tnslipabs and the integrated value release time Tnslipsum (FIGS. 3 to 5). In other words, the instantaneous value release time Tnslipabs and the integrated value release time Tnslipsum are evaluated by performing classification of combinations of the presence or absence of convergence to the target release time Tref, the learning gain KG is set according to the classification, and the old learning value Pofs (i -1) is updated to the new learning value Pofs (i).

  In this way, not only the instantaneous value release time Tnslipabs measured for the instantaneous value LCslipabs of the slip rotation speed but also the integrated value release time Tnslipsum measured for the time integrated value LCslipsum is evaluated. The control initial pressure Pini is learned based on both evaluations.

  The integrated value release time Tnslipsum is easily influenced by the rotational speed calculation accuracy and rotation fluctuation, but the timing at which the release starts can be detected with high accuracy. For this reason, the shortcoming that it is difficult to grasp the release start timing with the instantaneous value release time Tnslipabs can be complemented by evaluating the integrated value release time Tnslipsum together with the instantaneous value release time Tnslipabs.

  In addition, since the instantaneous value release time Tnslipabs is not easily affected by the rotational speed calculation accuracy or rotation fluctuation, the disadvantage of the integrated value release time Tnslipsum can be complemented. For this reason, it becomes possible to grasp the timing when the release starts reliably and accurately.

  Therefore, by performing learning of the control initial pressure Pini according to FIGS. 3 to 5, 7, and 8, learning can be performed based on the slip state detected reliably and with high accuracy, and when the lock-up clutch 10 is subjected to release control or slip control. The initial control pressure Pini can be set with high accuracy.

[Other embodiments]
(A). In the above embodiment, the lockup clutch engagement / release control (or slip control) is performed by adjusting the release pressure Pr. On the contrary, by adjusting the converter pressure Pc, the engagement / release control (or slip control) of the lock-up clutch may be executed by the differential pressure between the converter pressure Pc and the release pressure Pr. Further, the lockup clutch engagement / release control (or slip control) may be executed by adjusting both the release pressure Pr and the converter pressure Pc.

  (B). In the learning value correction amount calculation processing (FIGS. 4 and 5), if the integrated value release time Tnslipsum and the instantaneous value release time Tnslipabs converge on the target release time Tref (yes in S162), the release time Tnslip and the target The learning gain KG was determined by comparison with the release time Tref (S164). Since the release time Tnslip at this time is the integrated value release time Tnslipsum, when the two release times Tnslipsum and Tnslipabs converge, the learning gain KG is determined by comparing the integrated value release time Tnslipsum and the target release time Tref. Will do.

  Instead, in step S164, the learning gain KG may be determined by comparing the instantaneous value release time Tnslipabs with the target release time Tref as partially shown in FIG.

That is, in the case of yes (FIG. 5) in step S162, it is determined whether the instantaneous value release time Tnslipabs is equal to or longer than the target release time Tref (S164a).
If Tnslipabs ≧ Tref (yes in S164a), a learning gain KG4 having a constant value is set as the learning gain KG used in Equation 5 (S166a).

On the other hand, if Tnslipabs <Tref (no in S164a), the learning gain KG5 having a constant value is set as the learning gain KG used in Equation 5 (S168a).
That is, if it is determined as yes in step S162, one of the learning gains KG4 and KG5 having a constant value is changed to the learning gain of the above equation 5 based on the magnitude relationship between the instantaneous value release time Tnslipabs and the target release time Tref. It will be used as KG.

  These learning gains KG4 and KG5 are determined by experiments and theoretical calculations, and are values set as appropriate according to the types of automatic transmission, torque converter, lockup clutch, and hydraulic control circuit. Therefore, the learning gains KG4 and KG5 may have different values or the same value. Note that one or both of the learning gains KG4 and KG5 may be changed according to the difference between the instantaneous value release time Tnslipabs and the target release time Tref.

  (C). Instead of FIG. 11, the learning gain KG may be determined by comparing both the integrated value release time Tnslipsum and the instantaneous value release time Tnslipabs with the target release time Tref as partially shown in FIG.

That is, in the case of yes (FIG. 5) in step S162, it is determined whether the instantaneous value release time Tnslipabs is equal to or longer than the target release time Tref (S164a).
If Tnslipabs ≧ Tref (yes in S164a), it is next determined whether or not the integrated value release time Tnslipsum is equal to or longer than the target release time Tref (S164b). If Tnslipsum ≧ Tref (yes in S164b), a learning gain KGa having a constant value is set as the learning gain KG used in Equation 5 (S165a). If Tnslipsum <Tref (no in S164b), a constant learning gain KGb is set as the learning gain KG used in Equation 5 (S165b).

  On the other hand, if Tnslipabs <Tref (no in S164a), it is next determined whether or not the integrated value release time Tnslipsum is equal to or longer than the target release time Tref (S164c). If Tnslipsum ≧ Tref (yes in S164c), a learning gain KGc having a constant value is set as the learning gain KG used in Equation 5 (S165c). If Tnslipsum <Tref (no in S164c), a constant learning gain KGd is set to the learning gain KG used in Equation 5 (S165d).

  That is, if it is determined as yes in step S162, based on the magnitude relationship between the instantaneous value release time Tnslipabs and the target release time Tref and the magnitude relationship between the integrated value release time Tnslipsum and the target release time Tref, the learning gains KGa, KGb, Either KGc or KGd is used as the learning gain KG.

  The learning gains KGa, KGb, KGc, and KGd are determined by experiments and theoretical calculations, and are constant values that are set as appropriate depending on the type of automatic transmission, torque converter, lockup clutch, and hydraulic control circuit. Therefore, the learning gains KGa, KGb, KGc, and KGd may have different values or the same value. Note that one or more of the learning gains KGa, KGb, KGc, and KGd are set according to the difference between the instantaneous value release time Tnslipabs and the target release time Tref, or the difference between the integrated value release time Tnslipsum and the target release time Tref. Alternatively, the configuration may be changed in accordance with the difference between the two.

  (D). In the above-described embodiment, the target release time Tref is compared with the instantaneous value release time Tnslipabs and the integrated value release time Tnslipsum by setting the instantaneous value target slip rotation speed TGslipabs and the integrated value target slip rotation speed TGslipsum. The same value is used for comparison. However, different values may be used depending on the setting of the instantaneous value target slip rotation speed TGslipabs and the integrated value target slip rotation speed TGslipsum.

1 is a block diagram of a vehicle engine and an automatic transmission according to a first embodiment. 6 is a flowchart of lockup release control pressure calculation processing in the shifting ECU according to the first embodiment. The flowchart of the learning value setting process for control initial pressure similarly. The flowchart of learning value correction amount calculation processing similarly. The flowchart of learning value correction amount calculation processing similarly. The graph which shows the content of map MAPplc which similarly calculates basic control pressure Plc from vehicle deceleration DG. The flowchart of instant value release time Tnslipabs calculation processing similarly. Similarly, the flowchart of integrated value release time Tnslipsum calculation processing. The graph which similarly shows the content of the learning gain map MAPkg1 which calculates | requires learning gain KG from the difference of integrated value release time Tnslipsum and instantaneous value release time Tnslipabs. The timing chart which similarly shows an example of a process. The flowchart which shows the modification of learning value correction amount calculation processing. The flowchart which shows the modification of learning value correction amount calculation processing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Engine for vehicles, 2a ... Crankshaft, 4 ... Automatic transmission, 6 ... Torque converter, 6a ... Converter cover, 6b ... Pump impeller, 6c ... Turbine runner, 8 ... Automatic transmission main body, 8a ... Input shaft, 8b DESCRIPTION OF SYMBOLS ... Output shaft, 10 ... Lock-up clutch, 12 ... ECU for speed change, 14 ... Hydraulic control circuit, 16 ... Engine speed sensor, 18 ... Input shaft speed sensor, 20 ... Output shaft speed sensor, 22 ... Hydraulic control circuit .

Claims (10)

The clutch mechanism connected between the output rotation shaft on the rotational drive source side and the input rotation shaft on the rotational load side is controlled to release the engaged clutch mechanism by adjusting the drive pressure from the pressure source. Or a control initial pressure learning method for slip control,
A first elapsed time from the start of control until the instantaneous value of the slip rotational speed of the clutch mechanism reaches the instantaneous reference value, and a second time from the start of control until the time integrated value of the slip rotational speed reaches the integrated reference value. A clutch control initial pressure learning method characterized in that an elapsed time is measured and learning of a control initial pressure is executed based on the evaluation of the first elapsed time and the second elapsed time. 2. The control initial pressure learning according to claim 1, wherein learning of the control initial pressure is performed by updating a learning value of the control initial pressure based on an evaluation of the first elapsed time and the second elapsed time. Clutch control initial pressure learning method. In Claim 2, the evaluation of the first elapsed time and the second elapsed time is a classification of a combination of the presence or absence of convergence of the first elapsed time and the second elapsed time to a target elapsed time,
The learning value is updated by calculating a learning value correction amount according to the classification of the combination of convergence / non-convergence, and calculating a new learning value by correcting the old learning value by the learning value correction amount. The clutch control initial pressure learning method. In claim 3, the classification of the combination of presence / absence of convergence is divided into a case where only one of the first elapsed time and the second elapsed time has converged and a case where both have converged. ,
If only one of them converges, a learning gain corresponding to the difference between the first elapsed time and the second elapsed time is calculated, and the difference between the converged elapsed time and the target elapsed time is calculated. And the learning value correction amount is calculated from the product of the learning gain and
If both have converged, a learning gain is calculated based on a comparison between the first elapsed time or the second elapsed time and the target elapsed time, and the first elapsed time or the second elapsed time The learning value correction amount is calculated from the product of the difference between the time and the target elapsed time and the learning gain. 5. The rotary drive source according to claim 1, wherein the rotational drive source is one or both of an internal combustion engine and an electric motor mounted on a vehicle, and the clutch mechanism is a lock-up clutch provided in a torque converter. A clutch control initial pressure learning method characterized by: A clutch drive control device that drives a clutch mechanism that connects between an output rotation shaft on a rotational drive source side and an input rotation shaft on a rotational load side by adjusting a drive pressure supplied from a pressure source,
First elapsed time detection means for detecting a first elapsed time from the start of release control or slip control until the instantaneous value of the slip rotation speed of the clutch mechanism reaches the instantaneous reference value;
Second elapsed time detecting means for detecting a second elapsed time from the start of release control or slip control until the time accumulated value of the slip rotation speed reaches the accumulated reference value;
Based on the evaluation of the first elapsed time detected by the first elapsed time detecting means and the second elapsed time detected by the second elapsed time detecting means, a learning value of the control initial pressure is obtained. Learning value calculation means for calculating;
Drive pressure control means for starting release control or slip control of the clutch mechanism from a control initial pressure set based on the learned value calculated by the learned value calculating means;
A clutch drive control device comprising: 7. The clutch drive according to claim 6, wherein the learning value calculation means calculates a new learning value by correcting the old learning value based on the evaluation of the first elapsed time and the second elapsed time. Control device. The learning value calculation means according to claim 7,
As an evaluation of the first elapsed time and the second elapsed time, an elapsed time evaluation means for classifying a combination of whether or not the first elapsed time and the second elapsed time converge to a target elapsed time;
Learning value correction amount calculating means for calculating a learning value correction amount according to the classification by the elapsed time evaluating means;
Learning value updating means for calculating a new learning value by correcting the old learning value by the learning value correction amount calculated by the learning value correction amount calculating means;
A clutch drive control device comprising: In Claim 8, the elapsed time evaluation means classifies a case where only one of the first elapsed time and the second elapsed time has converged and a case where both have converged,
The learning value correction amount calculating means includes
When the classification of the elapsed time evaluation means is such that only one of the first elapsed time and the second elapsed time has converged, the difference between the first elapsed time and the second elapsed time The corresponding learning gain is calculated, the learning value correction amount is calculated from the product of the difference between the converged elapsed time and the target elapsed time and the learning gain,
When the classification of the elapsed time evaluation means is such that both the first elapsed time and the second elapsed time converge, the first elapsed time or the second elapsed time and the target elapsed time And calculating the learning value correction amount from the product of the difference between the first elapsed time or the second elapsed time and the target elapsed time and the learning gain. A clutch drive control device. 10. The rotary drive source according to claim 6, wherein the rotational drive source is one or both of an internal combustion engine and an electric motor mounted on a vehicle, and the clutch mechanism is a lockup clutch provided in a torque converter. A clutch drive control device.

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