JP4967929B2 - Automatic transmission control device - Google Patents

Description

  The present invention relates to a control device for an automatic transmission provided in a drive system of an internal combustion engine.

  In order to stabilize the shift control, the line pressure of the automatic transmission calculated based on the input torque is maintained at the start of the shift transition period (for example, the shift period after the inertia phase), and is maintained during the subsequent shift period. A technique for controlling an automatic transmission by line pressure has been proposed (see, for example, Patent Document 1).

As described above, the engine load may change greatly due to a change in the throttle opening during the shift transition period in which the line pressure is maintained for stable control of the automatic transmission. In such a case, a shift shock may occur due to an increase in the difference between the actually required line pressure and the holding line pressure when the shift is completed. To prevent this, when a change occurs in the engine load during the shift transition period in which the line pressure is maintained, the line is determined based on the engine load change direction and the magnitude relationship between the retained line pressure and the latest calculated line pressure. A technique for releasing the holding of pressure has been proposed (see, for example, Patent Document 2).
JP-A-5-280625 (page 4-5, FIG. 7) JP-A-7-127721 (page 4-5, FIG. 3)

  In Patent Document 2, a change in engine load is captured by a change in throttle opening. However, as described in Patent Document 2, even if the throttle opening change occurs, the correlation with the engine output torque changes depending on the engine speed, etc., so the release of the line pressure hold is executed only by the throttle opening change. There is a risk of misjudgment.

  For this reason, in Patent Document 2, when the direction of change in the throttle opening is determined, a comparison between the calculated line pressure and the holding line pressure is made, and if these determinations conflict, Even if it existed, the control by the holding line pressure was continued.

  However, if the direction of change in the throttle opening is contrary to the comparison result between the calculated line pressure and the holding line pressure, that is, if the two judgments are inconsistent, control should be performed ignoring the change in the throttle opening. become. In this case, even if some change occurs in the input torque to the automatic transmission due to the change in the throttle opening, the line pressure control is not considered.

  An object of the present invention is to prevent a shift shock by appropriately canceling a holding value set at the time of automatic transmission shifting according to an operating state of an internal combustion engine.

In the following, means for achieving the above object and its effects are described.
The automatic transmission control device according to claim 1 is an input torque detection means for detecting an input torque to an automatic transmission provided in a drive system of an internal combustion engine, and the input torque detection means at the initial stage of a shift of the automatic transmission. And an input torque holding means for storing the value of the input torque detected in step (b) as a holding value, and controlling the automatic transmission based on the holding value stored in the input torque holding means during the shift transition period. When the deviation between the input torque detected by the input torque detecting means and the holding value stored in the input torque holding means occurs, the value of the input torque detected by the input torque detecting means on the basis and an automatic transmission control means for controlling the automatic transmission, the automatic transmission control unit, to determine the deviation in the case where the difference between the maintenance value and the input torque exceeds the reference value has occurred Together with, the reference value, and setting in response to the holding value.

  If the difference between the input torque detected by the input torque detection means and the holding value occurs during the shift transition period, the automatic transmission control means stops using the holding value and sets the input torque value. The automatic transmission is controlled based on this.

  In other words, it does not determine the change in throttle opening, but directly determines the deviation of the input torque from the holding value, and if there is a deviation, stops using the holding value and determines the input torque detected in real time. Control is executed based on the value.

  Therefore, the use of the hold value can be stopped and the real-time input torque can be used for control without determining the consistency between the throttle opening change and the line pressure change as in Patent Document 2. Therefore, in the case of inconsistency, a shift shock due to the fact that the hold value cannot be released even if the throttle opening changes is prevented.

In this way, the release of the hold value set at the time of automatic transmission shifting can be appropriately executed according to the operating state of the internal combustion engine, so that a shift shock can be prevented.
In addition, it is possible to determine that the deviation has occurred when the difference between the input torque and the hold value exceeds the reference value by providing the reference value for the determination of the deviation. As a result, if the difference between the input torque and the holding value is within the reference value, the input value is stable and the use of the holding value can be continued, so that automatic transmission control can be stabilized. When the difference between the input torque and the hold value exceeds the reference value, it is assumed that a divergence has occurred.By controlling the automatic transmission based on the real-time input torque value, This difference can be avoided.
In this way, the release of the hold value set at the time of automatic transmission shifting can be appropriately executed according to the operating state of the internal combustion engine, so that a shift shock can be prevented.
Further, depending on the level of the hold value, the range in which it is better to stabilize the automatic transmission control using the hold value as it is varies. Therefore, by changing the reference value for judging the deviation according to the holding value, the deviation can be judged more appropriately, and the stable control of the automatic transmission by using the holding value and the shift shock prevention by using the real-time input torque can be achieved. The balance can be made good.
The automatic transmission control device according to claim 2 is characterized in that, in the invention according to claim 1, when the holding value is 0 or more, the reference value is set larger as the holding value becomes larger. .
Thus, the deviation can be appropriately determined, and the balance between the stable control of the automatic transmission by using the hold value and the prevention of the shift shock by using the real-time input torque can be improved.
According to a third aspect of the present invention, there is provided the automatic transmission control device according to the first aspect, wherein the reference value is set to a constant value when the holding value is less than zero.
When the holding value is negative, it is better to determine the divergence if the reference value is not changed in this way, and balance between the stable control of the automatic transmission by using the holding value and the prevention of shift shock by using the real-time input torque. It can be good.
The automatic transmission control device according to claim 4 is an input torque detection means for detecting an input torque to the automatic transmission provided in a drive system of the internal combustion engine, and the input torque detection means at the initial stage of a shift of the automatic transmission. And an input torque holding means for storing the value of the input torque detected in step (b) as a holding value, and controlling the automatic transmission based on the holding value stored in the input torque holding means during the shift transition period. When the deviation between the input torque detected by the input torque detecting means and the holding value stored in the input torque holding means occurs, the value of the input torque detected by the input torque detecting means Automatic transmission control means for controlling the automatic transmission based on the automatic transmission control means, wherein the automatic transmission control means determines that a deviation has occurred when a difference between the input torque and the hold value exceeds a reference value. Together, the value of the holding value is less than 0, and sets the reference value to a constant value.
If the difference between the input torque detected by the input torque detection means and the holding value occurs during the shift transition period, the automatic transmission control means stops using the holding value and sets the input torque value. The automatic transmission is controlled based on this.
In other words, it does not determine the change in throttle opening, but directly determines the deviation of the input torque from the holding value, and if there is a deviation, stops using the holding value and determines the input torque detected in real time. Control is executed based on the value.
Therefore, the use of the hold value can be stopped and the real-time input torque can be used for control without determining the consistency between the throttle opening change and the line pressure change as in Patent Document 2. Therefore, in the case of inconsistency, a shift shock due to the fact that the hold value cannot be released even if the throttle opening changes is prevented.
In this way, the release of the hold value set at the time of automatic transmission shifting can be appropriately executed according to the operating state of the internal combustion engine, so that a shift shock can be prevented.
In addition, it is possible to determine that the deviation has occurred when the difference between the input torque and the hold value exceeds the reference value by providing the reference value for the determination of the deviation. As a result, if the difference between the input torque and the holding value is within the reference value, the input value is stable and the use of the holding value can be continued, so that automatic transmission control can be stabilized. When the difference between the input torque and the hold value exceeds the reference value, it is assumed that a divergence has occurred.By controlling the automatic transmission based on the real-time input torque value, This difference can be avoided.
In this way, the release of the hold value set at the time of automatic transmission shifting can be appropriately executed according to the operating state of the internal combustion engine, so that a shift shock can be prevented.
In addition, when the holding value is negative, it is possible to properly determine the deviation if the reference value is not changed in this way, and the stable control of the automatic transmission by using the holding value and the shift shock prevention by using the real-time input torque. The balance can be made good.
According to a fifth aspect of the present invention , in the automatic transmission control device according to any one of the first to fourth aspects, the shift transient period is a shift period after the inertia phase.

  Thus, by setting the shift transition period as the shift period after the inertia phase, if there is no deviation between the input torque and the hold value, the control is executed with the hold value, and if there is a deviation, the control is performed with the input torque. By executing this, a shift shock can be sufficiently prevented.

According to a sixth aspect of the present invention , in the automatic transmission control device according to any one of the first to fifth aspects, the shift initial stage where the input torque holding means stores the hold value is a start time of the shift transition period. It is characterized by that.

As described above, by setting the initial stage of the shift for storing the hold value as the start time of the shift transition period, a sufficiently appropriate hold value can be stored.
In the automatic transmission control device according to a seventh aspect , in the invention according to any one of the first to sixth aspects, the input torque detecting means estimates an output torque of the internal combustion engine based on an operating state of the internal combustion engine, and The input torque is calculated based on the output torque.

Detection of the input torque can be realized by estimating the output torque of the internal combustion engine from the operating state of the internal combustion engine and calculating the input torque to the automatic transmission based on this value.
An automatic transmission control device according to an eighth aspect of the present invention is the automatic transmission control device according to the seventh aspect , wherein a torque converter is disposed between the internal combustion engine and the automatic transmission in the drive system, and the input torque detection means is an internal combustion engine. The input torque is calculated from the product of the output torque of the internal combustion engine estimated based on the operating state and the torque ratio of the torque converter.

More specifically, the input torque can be calculated from the product of the estimated output torque of the internal combustion engine and the torque ratio of the torque converter .

[Embodiment 1]
FIG. 1 is a block diagram showing a schematic configuration of an internal combustion engine, a drive system and a control system to which the above-described invention is applied. The internal combustion engine is a gasoline engine (hereinafter abbreviated as engine) 2. The drive system includes a torque converter 4 and an automatic transmission 6. The rotational driving force of the engine 2 is shifted by being transmitted to the automatic transmission 6 via the torque converter 4 and is output to the wheels as a vehicle driving force.

  The engine 2 is, for example, an in-line four-cylinder engine, and outside air adjusted by a throttle valve 12 is drawn into the combustion chamber 8 of each cylinder through an intake passage 10 having an air filter at the tip, and is supplied to each intake port 14. Thus, the fuel injected from the fuel injection valve 16 is supplied. The fuel may be directly injected into the combustion chamber 8. When ignition by the spark plug 18 is performed on the air / fuel mixture formed in the combustion chamber 8 in this way, the air / fuel mixture is combusted and the piston 20 reciprocates, and the output of the engine 2 The crankshaft 22 that is the shaft rotates. Then, the air-fuel mixture after combustion is sent out from each combustion chamber 8 to the exhaust passage 24 as exhaust. In the engine 2, the combustion chamber 8 and the intake passage 10 are connected and cut off by the opening / closing operation of the intake valve 26, and the combustion chamber 8 and the exhaust passage 24 are connected and cut off by the opening / closing operation of the exhaust valve 28. . The intake valve 26 and the exhaust valve 28 open and close with the rotation of the intake camshaft 30 and the exhaust camshaft 32 to which the rotation of the crankshaft 22 is transmitted.

  An electronic control device (hereinafter abbreviated as “EG-ECU”) 34 that controls the operation of the engine 2 is mounted on the vehicle. Through the EG-ECU 34, control such as throttle opening control, ignition timing control, fuel injection control, and the like of the engine 2 is performed. Detection signals from various sensors provided in the engine 2 are input to the EG-ECU 34 as described below. That is, an engine speed sensor 36 that detects the rotation of the crankshaft 22 (engine speed NE), a cam position sensor 38 that detects the rotation position (cam angle) of the intake camshaft 30, and an accelerator opening that is the amount of depression of the accelerator pedal 40 An accelerator opening sensor 42 for detecting the degree ACCP (%) is provided. Further, a throttle opening sensor 44 for detecting the throttle opening TA (%) in the throttle valve 12, an intake air sensor 46 for detecting the intake air amount GA (g / s) passing through the intake passage 10, and a cooling water temperature THW of the engine 2 A water temperature sensor 48 or the like is provided.

  In this engine 2, the EG-ECU 34 adjusts the throttle opening TA by driving the throttle valve 12 with the electric motor 12 a in accordance with the accelerator opening ACCP detected by the accelerator opening sensor 42. Further, the throttle valve 12 is automatically controlled by a vehicle stabilization control (VSC: vehicle stability control) system provided in the EG-ECU 34. As a result, the output torque generated by the engine 2 is adjusted to increase or decrease and output to the torque converter 4 side. Note that the electronic control device for vehicle stabilization control may have a configuration provided separately from the EG-ECU 34.

  An automatic transmission control device (hereinafter abbreviated as “AT-ECU”) 50 that executes shift control for the automatic transmission 6 includes a torque converter output shaft sensor 52 provided on the output shaft 4 a of the torque converter 4 and a torque converter 4. The rotational speed NT on the output side (input side of the automatic transmission 6) is detected. Further, the rotational speed Nout on the output side of the automatic transmission 6 is detected from the transmission output shaft sensor 54 provided on the output shaft 6 a of the automatic transmission 6, and the position of the shift lever 55 a is detected from the shift position sensor 55. . The EG-ECU 34 exchanges information with the AT-ECU 50.

  The AT-ECU 50 controls a valve in a hydraulic control circuit 56 provided in the automatic transmission 6 to engage and release an internal clutch and an internal brake to execute a shift. Further, the AT-ECU 50 adjusts the line pressure, which is the hydraulic pressure supplied from the hydraulic pump to the hydraulic control circuit 56 for this speed change drive, according to the speed change state by the oil pressure adjustment unit 58, and torque during the speed change. Adjustment is made according to the input torque input to the automatic transmission 6 from the output shaft 4 a of the converter 4.

  Next, the line pressure adjustment control executed by the AT-ECU 50 during the shift with respect to the hydraulic pressure adjustment unit 58 will be described based on the flowchart of FIG. This process is repeatedly executed at regular time intervals.

  When this process is started, it is first determined whether or not a shift is in progress (S102). If the speed is not being changed (no in S102), the hold release flag Fend is set to OFF (S104), and the process is temporarily exited. Therefore, the line pressure adjusted by the hydraulic pressure adjusting unit 58 is separately controlled to be a hydraulic pressure corresponding to the shift shift state.

  If the gear is being changed (yes in S102), it is next determined whether or not the inertia phase starts (S106). During the shift, the torque phase, inertia phase, and torque phase sequentially change, but if this inertia phase does not start (No in S106), then whether or not the inertia phase starts (equivalent to before the shift transition period) Is determined (S108). Here, since it is before the start of the inertia phase (yes in S108), the input torque detection value tt is set to the control input torque value ctt (S110).

  This input torque detection value tt calculates the output torque of the engine 2 based on the operating state of the engine 2, and outputs the torque output from the torque converter 4, that is, the output to the automatic transmission 6 by the product with the torque ratio in the torque converter 4. This is a value calculated by estimating the input torque. The calculation of the input torque detection value tt is repeatedly executed by the EG-ECU 34 or the AT-ECU 50 itself at a constant time period or a constant crank angle period. Thus, it is calculated as a real-time input torque.

  Here, the operating state of the engine 2 for calculating the engine output torque includes the intake air amount GA detected by the intake air amount sensor 46, the engine speed NE detected by the engine speed sensor 36, and the air-fuel ratio. Alternatively, the accelerator opening ACCP detected by the accelerator opening sensor 42 may be used. Further, an engine output torque reflecting the output torque change transient state with higher accuracy is calculated by an estimation calculation using the model of the engine 2, and the input torque detection value tt is calculated using this output torque. Also good.

  As described above, when the input torque detection value tt is set to the control input torque value ctt (S110), the line pressure PL corresponding to the control input torque value ctt is set, and this line pressure PL is set. The hydraulic pressure adjusting unit 58 is controlled (S118). For example, the line pressure PL is adjusted based on the control input torque value ctt, as shown in FIG.

  Thus, in the torque phase before the inertia phase, it is determined as no in step S106 and step S108 yes, and is adjusted to the line pressure PL corresponding to the input torque detection value tt (S110, S118).

  Next, in the first control cycle after the start of the inertia phase, it is determined that the inertia phase has started (corresponding to the initial shift of the automatic transmission) (yes in S106). Therefore, the input torque detection value tt obtained at this time is set as the input torque holding value tthd (S112). Next, based on this input torque holding value tthd, a deviation determination reference value dtt is obtained from the map MAPdtt (S114).

  An example of this map MAPdtt is shown in FIG. When the input torque holding value tthd is 0 or more, the deviation determination reference value dtt is set to a larger value as the input torque holding value tthd increases. When the input torque holding value tthd is less than 0, the deviation determination reference value dtt is set to a constant value regardless of the value of the input torque holding value tthd.

  When the input torque holding value tthd (S112) and the deviation determination reference value dtt (S114) are set in this way, the input torque holding value tthd is set to the control input torque value ctt (S116). Then, as described above, the hydraulic pressure adjustment unit 58 is controlled so that the line pressure PL corresponds to the control input torque value ctt (S118).

  In the next control cycle, since the inertia phase is entered and not at the start of the inertia phase (no in S106), it is determined whether or not the inertia phase is started (S108). Since this timing is after the start of the inertia phase (no in S108), it is next determined whether or not the hold release flag Fend is OFF (S120). Here, since Fend is still OFF (yes in S120), it is next determined whether or not the condition shown in Expression 1 is satisfied (S122).

[Formula 1] | tthd−tt |> dtt
That is, it is determined whether or not the difference | tthd−tt | between the input torque detection value tt, which is a real-time detection value, and the input torque hold value tthd is greater than the deviation determination reference value dtt.

  Here, if the input torque detection value tt is stable and Equation 1 is not satisfied (No in S122), the input torque holding value tthd is set to the control input torque value ctt as described above (S116), and this control is performed. The hydraulic pressure adjusting unit 58 is controlled so as to be the line pressure PL corresponding to the input torque value ctt for use (S118).

  Since the input torque holding value tthd at this time remains in the state where the value of the input torque detection value tt at the start of the inertia phase is held (S112), the line pressure corresponding to the fixed input torque holding value tthd PL is realized.

  Even if the inertia phase ends and becomes the last torque phase without satisfying Equation 1, the state is determined as no in step S106, no in step S108, yes in step S120, and no in step S122. Continues and the state of executing steps S116 and S118 continues. Therefore, in this case as well, the input torque holding value tthd remains in the state where the value of the input torque detection value tt at the start of the inertia phase is held (S112), and therefore corresponds to the fixed input torque holding value tthd. Line pressure PL is realized.

If the last torque phase is also completed, the shift is completed and it is determined as no in step S102, so that the initial state is restored.
Next, if the equation 1 is satisfied after the inertia phase is started (no in S108), it is determined yes in step S122, and then the hold release flag Fend is set to ON (S124). Then, the input torque detection value tt is set to the control input torque value ctt in the same manner as before the start of the inertia phase (S110), and the hydraulic pressure adjustment unit 58 is controlled so that the line pressure PL corresponds to the control input torque value ctt. (S118).

  That is, when the deviation | tthd-tt | between the input torque detection value tt and the input torque hold value tthd becomes larger than the deviation determination reference value dtt, the control input torque value ctt is set to the input torque estimated from the current engine operating state. A detection value tt is set. As a result, the hydraulic pressure adjusting unit 58 is controlled so that the line pressure PL becomes the current input torque detection value tt. That is, the state where the input torque holding value tthd is set to the control input torque value ctt is released.

  In the subsequent control cycle, no is determined in step S106, and no is determined in step S108. However, since the hold release flag Fend is ON (no in S120), the line pressure PL also corresponds to the detected input torque value tt. Thus, the hydraulic pressure adjustment unit 58 is controlled (S110, S118).

When the shift is completed (no in S102), the hold release flag Fend is set to OFF (S104), and the process returns to the state where it is temporarily exited.
An example of control in the present embodiment is shown in the timing chart of FIG.

  The inertia phase starts at timing t0. Therefore, the input torque detection value tt is held as the input torque holding value tthd at this timing t0, and the line pressure PL becomes constant because it corresponds to the input torque holding value tthd. When the deviation | tthd−tt | between the input torque holding value tthd and the input torque detection value tt exceeds the deviation determination reference value dtt (t1), the line pressure PL is made to correspond to the input torque detection value tt thereafter. Become. Here, the line pressure PL increases in accordance with the input torque detection value tt. FIG. 5 shows an example of the torque increase of the input torque detection value tt, but the same effect is produced although it functions in reverse when the torque is reduced.

  In the configuration described above, the process of estimating and calculating the input torque detection value tt described in step S110 is the process as the input torque detection means, steps S106 and S112 are the process as the input torque holding means, and steps S106 to S110 and S114. To S124 correspond to processing as automatic transmission control means.

According to the first embodiment described above, the following effects can be obtained.
(I). In the line pressure adjustment control process (FIG. 2), the above expression indicates that a difference between the input torque detection value tt detected during the shift transition period and the input torque hold value tthd detected at the start of the shift transition period occurs. 1 is determined. If Equation 1 is not satisfied, it is determined that no deviation has occurred, and the input torque holding value tthd is continuously used for adjusting the line pressure PL to control the automatic transmission. If Formula 1 is satisfied, it is assumed that there is a divergence, and the process is switched to the process of controlling the automatic transmission using the real-time input torque detection value tt for line pressure PL adjustment without using the input torque holding value tthd.

  That is, instead of determining the change in the throttle opening degree TA, the deviation of the input torque detection value tt from the input torque holding value tthd is directly determined, and if there is a deviation, the use of the input torque holding value tthd is stopped. Real-time input torque detection value tt is used.

  Therefore, the real-time input torque detection value tt can be used without using the input torque holding value tthd without determining the consistency between the change in the throttle opening degree TA and the change in the line pressure as in Patent Document 2 described above. For this reason, even if the throttle opening degree TA changes, the change in the throttle opening degree TA and the change in the line pressure are inconsistent, so that it is possible to prevent a shift shock due to the fact that the input torque detection value tt cannot be used.

  (B). A deviation determination reference value dtt is provided for the deviation determination, and the difference between the real-time input torque detection value tt and the input torque holding value tthd | tthd−tt | exceeds the deviation determination reference value dtt. Is determined to have occurred. The deviation determination reference value dtt is set to be larger as the input torque holding value tthd increases when the input torque holding value tthd is 0 or more. When the input torque holding value tthd is less than 0, the deviation determination reference value dtt is set to a constant value.

  As a result, if the difference between the input torque detection value tt and the input torque hold value tthd is within the deviation determination reference value dtt, the input torque hold value tthd can be used as the input torque is stable. Transmission control can be made stable. When the difference between the input torque detection value tt and the input torque hold value tthd exceeds the deviation determination reference value dtt, it is assumed that a deviation has occurred, and the automatic transmission is based on the real-time input torque detection value tt. 6 is controlled. As a result, a difference from the line pressure required at the completion of the shift can be prevented, so that a shift shock can be prevented.

[Other embodiments]
(A). In the above-described embodiment, the initial gear shift of the automatic transmission that sets the input torque detection value tt to the input torque holding value tthd is the start of the inertia phase. Instead, during the initial torque phase or at the end of the initial torque phase, the automatic transmission may be shifted to the initial stage, and the input torque detection value tt may be set to the input torque hold value tthd at this timing.

1 is a block diagram showing a schematic configuration of an internal combustion engine, a drive system, and a control system of Embodiment 1. FIG. 4 is a flowchart of line pressure adjustment control processing executed by the AT-ECU of the first embodiment. 3 is a graph showing a relationship between a control input torque value ctt used in the first embodiment and a line pressure PL. FIG. 3 is a configuration explanatory diagram of a map MAPdtt showing a relationship between an input torque holding value tthd and a deviation determination reference value dtt used in the first embodiment. 4 is a timing chart illustrating an example of control according to the first embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Engine, 4 ... Torque converter, 4a ... Output shaft, 6 ... Automatic transmission, 6a ... Output shaft, 8 ... Combustion chamber, 10 ... Intake passage, 12 ... Throttle valve, 12a ... Electric motor, 14 ... Intake port, DESCRIPTION OF SYMBOLS 16 ... Fuel injection valve, 18 ... Spark plug, 20 ... Piston, 22 ... Crankshaft, 24 ... Exhaust passage, 26 ... Intake valve, 28 ... Exhaust valve, 30 ... Intake camshaft, 32 ... Exhaust camshaft, 34 ... EG -ECU, 36 ... engine speed sensor, 38 ... cam position sensor, 40 ... accelerator pedal, 42 ... accelerator opening sensor, 44 ... throttle opening sensor, 46 ... intake air amount sensor, 48 ... water temperature sensor, 50 ... AT- ECU, 52 ... torque converter output shaft sensor, 54 ... transmission output shaft sensor, 55 ... shift position sensor, 55a ... shift lever , 56 ... hydraulic control circuit, 58 ... hydraulic adjustment unit.

Claims (8)

An input torque detecting means for detecting an input torque to an automatic transmission provided in a drive system of the internal combustion engine;
Input torque holding means for storing the value of the input torque detected by the input torque detecting means at the initial stage of shifting of the automatic transmission as a holding value;
During the shift transition period, the automatic transmission is controlled based on the holding value stored in the input torque holding means, and the input torque detected by the input torque detecting means and the input torque holding means Automatic transmission control means for controlling the automatic transmission based on the value of the input torque detected by the input torque detection means when a deviation from the stored holding value occurs ,
The automatic transmission control means determines that a deviation has occurred when a difference between the input torque and the hold value exceeds a reference value, and sets the reference value according to the hold value. An automatic transmission control device. 2. The automatic transmission control apparatus according to claim 1 , wherein when the holding value is 0 or more, the reference value is set to be larger as the holding value is larger. 2. The automatic transmission control device according to claim 1 , wherein when the holding value is less than 0, the reference value is set to a constant value. An input torque detecting means for detecting an input torque to an automatic transmission provided in a drive system of the internal combustion engine;
  Input torque holding means for storing the value of the input torque detected by the input torque detecting means at the initial stage of shifting of the automatic transmission as a holding value;
  During the shift transition period, the automatic transmission is controlled based on the holding value stored in the input torque holding means, and the input torque detected by the input torque detecting means and the input torque holding means Automatic transmission control means for controlling the automatic transmission based on the value of the input torque detected by the input torque detection means when a deviation from the stored holding value occurs,
  The automatic transmission control means determines that a divergence has occurred when the difference between the input torque and the hold value exceeds a reference value, and sets the reference value to be constant when the hold value is less than 0. An automatic transmission control device characterized in that it is set to a value. In any one of claims 1 to 4, wherein the speed change transition period, the automatic transmission control apparatus which is a transmission period of the inertia phase after. In any one of claims 1 to 5, wherein the speed change initial input torque holding means for storing the retention value, the automatic transmission control device, characterized in that at the start of the shift transient period. 7. The input torque detector according to claim 1, wherein the input torque detecting means estimates an output torque of the internal combustion engine based on an operating state of the internal combustion engine, and calculates the input torque based on the output torque. An automatic transmission control device characterized by that. 8. The drive system according to claim 7 , wherein a torque converter is disposed between the internal combustion engine and the automatic transmission in the drive system, and the input torque detection means includes an output torque of the internal combustion engine estimated based on an operating state of the internal combustion engine. An automatic transmission control apparatus characterized in that the input torque is calculated by a product of a torque converter torque ratio.

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